Fix CTM to not spread to nearby TEs (#1695)

* Maybe fix DragonAPI on OSX - take two
* Bind a default VAO on the SharedDrawable
* Mixin that tries to swap out glGetProgramInfoLog when appropriate

* no direct gl calls

.gitignore

@@ -3,7 +3,7 @@
 /.idea/
 /.vs/
 /.vscode/
-/run/
+run/
 build/
 /eclipse/
 .classpath

CTM.MD

@@ -0,0 +1,302 @@
+# CTM Guide<img src="img/logo-readme.png" align="right">
+###### by Vortex [@vortex_so in discord, any suggestions are accepted]<br>
+
+This file describes how to use CTM, structure of `.properties` file and some useful (or not) techniques
+
+### Note:
+- All textures for CTM textures are in `[modname]/mcpatcher/ctm` folder<br>
+the overrides apply globally so it doesn't matter in which directory you put them<br>
+
+- in the `ctm` folder you must have a folder with your block name (or any name actually)<br>
+in that folder you will have all texture files (animations allowed via mcmeta file for every texture) and `.properties` file<br>
+multiple `.properties` files are allowed for a single folder and set of textures for more complex behaviour (see examples)
+
+## Quick Links
+- **[Method](#method)**
+- **[MatchBlocks](#matchblocks)**
+- **[MatchTiles](#matchtiles)**
+- **[Tiles](#tiles)**
+- **[Connect](#connect)**
+- **[Faces](#faces)**
+- **[Biomes](#biomes)**
+- **[Heights](#heights)**
+- **[RenderPass](#renderpass)**
+- **[InnerSeams](#innerseams)**
+- **[Weights](#weights)**<br>
+- **[Examples](#examples)**
+
+## Structure of `.properties` files
+
+---
+
+## `matchBlocks`
+Override for a specific block, you can get the value from the tooltip if you have this feature enabled.<br>
+Can accept several values which allows to apply one CTM for different blocks.<br>
+if no value for this property was provided, Angelica will fallback to name of the `.property` file
+
+examples:<br>
+`matchBlocks=gregtech:gt.blockcasings4`<br>
+`matchBlocks=minecraft:glass minecraft:glass_pane`
+
+---
+
+## `matchTiles`
+Override for a specific texture, main difference from matchBlocks is that this will only match a certain texture, not the block itself<br>
+
+example:<br>
+`matchTiles:minecraft:blocks/stone`
+
+---
+
+## `tiles`
+The list of texture names for CTM. Supports ranges and explicit names.<br>
+You probably would want to use texture names like `0.png`, `1.png` as it is easier, however this allows for any names
+
+examples:<br>
+`tiles=0-46` - classic for full CTM, expects files from `0.png` to `46.png`<br>
+`tiles=0-3,5, 8` - expects files `0.png`, `1.png`, `2.png`, `3.png`, `5.png`, `8.png`<br>
+`tiles=sometext,somemoretext` - expects files `sometext.png`, `somemoretext.png`
+
+---
+
+## `connect`
+Sets how the blocks are connected, can accept values: `block`, `tile`, `material`<br>
+`block` connects based on block (who would guess)<br>
+`tile` connects based on texture<br>
+`material` connects based on material (didn't really understand this part, ig it is for stone, iron, wood etc)<br>
+Fallbacks to `block` if no value for `matchTiles` is set, otherwise fallbacks to `tile`<br>
+Most of the time you don't need to set this value because of that fallback rule
+
+example:<br>
+`connect=block`
+
+---
+
+## `faces`
+Limit to specific faces of a block, can accept several values<br>
+Fallbacks to `all` if value not present in the `.properties` file
+
+examples:<br>
+`faces=top`<br>
+`faces=all`<br>
+`faces=bottom`<br>
+`faces=sides`<br>
+`faces=north south east west`<br>
+`faces=top bottom sides`
+
+---
+
+## `biomes`
+Limit to specific biomes, can accept several values<br>
+Fallbacks to all if value not present in the `.properties` file
+
+examples:<br>
+`biomes=plains`<br>
+`biomes=desert forest`<br>
+`biomes=taiga jungle savanna`
+
+---
+
+## `heights`
+Limit to certain Y levels, can only accept several values<br>
+can be set through either `minHeight` and `maxHeight` or `heights`
+
+examples:<br>
+`heights=0-64`<br>
+`heights=64-255`<br>
+example of maxHeight and minHeight:<br>
+`minHeight=64`<br>
+`maxHeight=128`
+
+---
+
+## `renderPass`
+Controls which rendering layer a CTM rule is applied in<br>
+In most cases you only need it to avoid rendering issues with transparency
+
+`renderPass=solid` used for fully opaque blocks<br>
+`renderPass=cutout` used for fences, glass CTM, textured blocks with hard transparency<br>
+`renderPass=translucent` used for transparent blocks like glass or water<br>
+`renderPass=cutout_mipped` no idea for what<br>
+`renderPass=overlay` used for blocks with an overlay, for example GT hatches or damaged anvils<br>
+`renderPass=backface` used for blocks with a backface, however it is very rare to use this one
+
+---
+
+## `innerSeams`
+Adds internal seams, fallback to `innerSeams=false` if not set<br>
+
+example:<br>
+`innerSeams=true`
+
+---
+
+## `weights`
+Priority, used for `Random` type to determine which textures have certain chances to be used for render<br>
+accepts several values, assigns values correspondingly to `tiles` list values
+
+examples:<br>
+`weight=10`<br>
+`weights=1 3 3 2 1`
+
+---
+
+# `Method`
+
+Selects CTM mode:
+- [LINK](#full-ctm-ctm) `ctm` / `glass` / `default`
+- [LINK](#compact-ctm) `compact` / `ctm_compact`
+- [LINK](#horizontal)`horizontal` / `bookshelf`
+- [LINK](#vertical)`vertical`
+- [LINK](#horizontalvertical-hv)`horizontal+vertical` / `h+v`
+- [LINK](#verticalhorizontal-vh)`vertical+horizontal` / `v+h`
+- [LINK](#top)`top` / `sandstone`
+- [LINK](#repeat)`repeat` / `pattern`
+- [LINK](#random)`random`
+- [LINK](#fixed)`fixed` / `static`
+
+example:<br>
+`method=ctm`
+
+### Full CTM (ctm)
+
+Requires exactly 47 tiles, the most versatile but the most size-heavy method
+
+Here's a visual explanation of how the textures should be numbered:
+
+<img src="img/CTM/CTM-pattern.png" width="624" style="image-rendering: pixelated;">
+
+---
+
+### Compact CTM
+
+Requires exactly 5 tiles.
+
+<img src="img/CTM/CCTM-pattern.png" width="284" style="image-rendering: pixelated;">
+
+Splits face into 4 quadrants and builds final texture per quadrant.
+
+Here's a visual explanation of how it works on an example of 3x3 blocks pattern with a cutout:
+
+<img src="img/CTM/CCTM-principle.png" width="400" style="image-rendering: pixelated;">
+
+as you can see, compact CTM has a single limitation:<br>
+the size of any part of texture, such as an edge or a corner, can't be larger than `8x8` pixel<br>
+this is the main case where only full CTM can be used.
+
+---
+
+### Horizontal
+
+Requires exactly 4 tiles. connects only horizontally, used for bookshelves for example
+
+<img src="img/CTM/HCTM-pattern.png" width="284" style="image-rendering: pixelated;">
+
+
+---
+
+### Vertical
+
+Requires exactly 4 tiles.
+
+<img src="img/CTM/VCTM-pattern.png" height="284" style="image-rendering: pixelated;">
+
+---
+
+### Horizontal+Vertical (h+v)
+
+Requires exactly 7 tiles.
+
+Two-stage: horizontal first, then vertical if none horizontal variations are found.
+
+<img src="img/CTM/HVCTM-pattern.png" height="284" style="image-rendering: pixelated;">
+
+---
+
+### Vertical+Horizontal (v+h)
+
+Requires exactly 7 tiles.
+
+Two-stage: vertical first, then horizontal if none vertical variations are found.
+
+<img src="img/CTM/VHCTM-pattern.png" height="284" style="image-rendering: pixelated;">
+
+---
+
+### Top
+
+Requires exactly 1 tile.
+
+Applies tile on side faces when block above matches, for example used for smooth sandstone
+
+---
+
+### Repeat
+
+Requires width * height tiles.
+
+Properties:
+- `width` - defines the number of tiles in width
+- `height` - defines the number of tiles in height
+- `symmetry` - defines the symmetry of the pattern, can be either `none` or `opposite`
+
+Just uses N*M grid, for example<br>
+`0 1 2 3 4`<br>
+`5 6 7 8 9`
+
+---
+
+### Random
+
+Any number of tiles.
+
+Properties:
+- `weights` - described [here](#weights)
+- `symmetry` - accepts `all`, `opposite`, `none`, groups opposite faces together, otherwise keeps them independent
+- `linked` - makes the textures consistent between render states, not needed much
+
+---
+
+### Fixed
+
+Requires exactly 1 tile. Always uses the same tile.<br>
+useful only if combined with height or other properties (see examples)
+
+---
+
+# Examples
+
+## Glass via full CTM
+```properties
+matchBlocks=minecraft:glass minecraft:glass_pane
+metadata=0
+method=ctm
+faces=all
+tiles=0-46
+connect=block
+```
+
+## Multiple properties files usage
+### Use multiple .properties files with different heights for more detailed worldgen
+this one will use one texture for lower part of the world and another for the rest of the world
+```properties
+matchBlocks=minecraft:dirt
+metadata=0
+method=fixed
+faces=all
+tiles=0
+connect=block
+maxHeight=40
+```
+
+```properties
+matchBlocks=minecraft:dirt
+metadata=0
+method=fixed
+faces=all
+tiles=0
+connect=block
+minHeight=41
+```
+
+---

dependencies.gradle

@@ -83,7 +83,7 @@ dependencies {
     shadowImplementation("net.minecraftforge:eventbus:7.0-beta.15")
 
     shadowImplementation("org.anarres:jcpp:1.4.14") // Apache 2.0
-    shadowImplementation("org.taumc:glsl-transformation-lib:0.2.0-26.g5ee7d96-GTNH") {
+    shadowImplementation("org.taumc:glsl-transformation-lib:0.2.0-32.g7dd88a4-GTNH") {
         exclude module: "antlr4" // we only want to shadow the runtime module
     }
     shadowImplementation("org.antlr:antlr4-runtime:4.13.2")
@@ -97,6 +97,8 @@ dependencies {
     devOnlyNonPublishable('com.github.GTNewHorizons:NotEnoughItems:2.8.35-GTNH:dev')
     devOnlyNonPublishable('com.github.GTNewHorizons:CodeChickenCore:1.4.7:dev')
 
+    //devOnlyNonPublishable('com.github.GTNewHorizons:worldedit-gtnh:v0.0.9')
+
     // Notfine Deps
     compileOnly("thaumcraft:Thaumcraft:1.7.10-4.2.3.5:dev")
     devOnlyNonPublishable("com.github.GTNewHorizons:Baubles-Expanded:2.2.2-GTNH:dev")
@@ -119,7 +121,7 @@ dependencies {
 
     compileOnly("com.github.GTNewHorizons:NotEnoughIds:2.1.10:dev")
 
-    compileOnly(rfg.deobf("maven.modrinth:ntmspace:X5593_H261"))
+    compileOnly(rfg.deobf("maven.modrinth:ntmspace:X5663_H261"))
 
     compileOnly(rfg.deobf("curse.maven:campfirebackport-387444:4611675"))
     compileOnly(rfg.deobf("curse.maven:xaeros-minimap-263420:5060684"))
@@ -136,6 +138,9 @@ dependencies {
     // Better Crashes
     compileOnly("com.github.GTNewHorizons:BetterCrashes:1.4.1-GTNH:dev")
 
+    // Distant Horizons
+    compileOnly("maven.modrinth:DistantHorizonsApi:5.1.0")
+
     afterEvaluate {
         dependencies {
             testImplementation(platform('org.junit:junit-bom:5.14.1'))

glsm/build.gradle.kts

@@ -76,7 +76,7 @@ dependencies {
     compileOnly("org.lwjgl.lwjgl:lwjgl:${property("lwjglVersion")}")
     compileOnly("org.lwjgl.lwjgl:lwjgl_util:${property("lwjglVersion")}")
 
-    compileOnly("org.ow2.asm:asm-tree:9.7")
+    compileOnly("org.ow2.asm:asm-tree:5.0.3")
 
     // Our Deps
     api("com.github.GTNewHorizons:GTNHLib:${property("gtnhlibVersion")}:dev")
@@ -100,6 +100,7 @@ dependencies {
     testImplementation(sourceSets["stubs"].output)
     testImplementation(platform("org.junit:junit-bom:${property("junitBomVersion")}"))
     testImplementation("org.junit.jupiter:junit-jupiter")
+    testImplementation("org.ow2.asm:asm-tree:9.7")
     testImplementation("org.lwjgl.lwjgl:lwjgl:${property("lwjglVersion")}")
     testRuntimeOnly("org.junit.platform:junit-platform-launcher")
     testRuntimeOnly("org.apache.logging.log4j:log4j-core:${property("log4jVersion")}")
@@ -145,6 +146,10 @@ tasks.test {
 
     javaLauncher = javaToolchains.launcherFor {
         languageVersion = JavaLanguageVersion.of(8)
+        if (System.getProperty("os.name").lowercase().contains("mac")
+            && System.getProperty("os.arch") == "aarch64") {
+            vendor = JvmVendorSpec.AZUL
+        }
     }
 
     dependsOn(downgradeMainClasses, downgradeTestClasses, downgradeDepsForTest)

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/DisplayListManager.java

@@ -15,6 +15,9 @@ import com.gtnewhorizons.angelica.glsm.recording.DisplayListVBO;
 import com.gtnewhorizons.angelica.glsm.recording.DisplayListVBOBuilder;
 import com.gtnewhorizons.angelica.glsm.recording.GLCommand;
 import com.gtnewhorizons.angelica.glsm.recording.commands.DisplayListCommand;
+import com.gtnewhorizons.angelica.glsm.recording.commands.IndexedDrawBatch;
+import com.gtnewhorizons.angelica.glsm.recording.commands.IndexedDrawBatchBuilder;
+import com.gtnewhorizons.angelica.glsm.recording.commands.IndexedDrawCapture;
 import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
 import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
 import lombok.Getter;
@@ -566,12 +569,16 @@ public class DisplayListManager {
         currentRecorder.recordDrawBuffers(count, bufs);
     }
 
-    // Complex commands are texture uploads - not draw barriers
     public static void recordComplexCommand(DisplayListCommand cmd) {
         if (currentRecorder == null) return;
         currentRecorder.recordComplexCommand(cmd);
     }
 
+    public static void recordIndexedDrawCapture(IndexedDrawCapture capture) {
+        if (currentRecorder == null) return;
+        currentRecorder.recordIndexedDrawCapture(capture);
+    }
+
     public static void recordLoadMatrix(Matrix4f matrix) {
         if (currentRecorder != null) currentRecorder.recordLoadMatrix(matrix);
     }
@@ -580,14 +587,6 @@ public class DisplayListManager {
         if (currentRecorder != null) currentRecorder.recordLoadIdentity();
     }
 
-    public static void recordDrawArrays(int mode, int start, int count) {
-        if (currentRecorder != null) currentRecorder.recordDrawArrays(mode, start, count);
-    }
-
-    public static void recordDrawElements(int mode, int indices_count, int type, long indices_buffer_offset) {
-        if (currentRecorder != null) currentRecorder.recordDrawElements(mode, indices_count, type, indices_buffer_offset);
-    }
-
     public static void recordBindVBO(int vbo) { if (currentRecorder != null) currentRecorder.recordBindVBO(vbo); }
     public static void recordBindVAO(int vao) { if (currentRecorder != null) currentRecorder.recordBindVAO(vao); }
 
@@ -822,17 +821,34 @@ public class DisplayListManager {
         final boolean hasDraws = accumulatedDraws != null && !accumulatedDraws.isEmpty();
 
         if (hasCommands || hasDraws) {
-            // Phase 1: Compile format-based VBOs (shared by both optimized and unoptimized paths)
             final DisplayListVBO compiledBuffers = new DisplayListVBOBuilder().addDraws(accumulatedDraws).build();
+            try {
+                final CommandBuffer finalBuffer = new CommandBuffer();
+                CommandBufferBuilder.buildFromRawBuffer(rawCommandBuffer, accumulatedDraws, finalBuffer);
 
-            // Build to CommandBuffer - optimize raw buffer to final buffer
-            final CommandBuffer finalBuffer = new CommandBuffer();
-            CommandBufferBuilder.buildFromRawBuffer(rawCommandBuffer, accumulatedDraws, finalBuffer);
+                final IndexedDrawBatchBuilder indexedBuilder = currentRecorder.getIndexedDraws();
+                final List<IndexedDrawBatch> indexedBatches;
+                if (indexedBuilder.isEmpty()) {
+                    indexedBatches = Collections.emptyList();
+                } else {
+                    final CommandRecorder paused = pauseRecording();
+                    try {
+                        indexedBatches = indexedBuilder.build();
+                    } finally {
+                        try {
+                            for (IndexedDrawCapture c : indexedBuilder.getCaptures()) {
+                                c.freeBuffers();
+                            }
+                        } finally {
+                            resumeRecording(paused);
+                        }
+                    }
+                }
 
-            // Free the recorder (and its buffer) after optimization
-            currentRecorder.free();
-
-            compiled = new CompiledDisplayList(finalBuffer.toBuffer(), finalBuffer.getComplexObjects(), compiledBuffers);
+                compiled = new CompiledDisplayList(finalBuffer.toBuffer(), finalBuffer.getComplexObjects(), compiledBuffers, indexedBatches);
+            } finally {
+                currentRecorder.free();
+            }
         } else {
             // Free the recorder even if empty
             if (currentRecorder != null) {
@@ -841,8 +857,10 @@ public class DisplayListManager {
             // Empty display list - per OpenGL spec, still valid after glNewList/glEndList
             compiled = CompiledDisplayList.EMPTY;
         }
-        // Store the compiled list (even if empty - an empty list is still a valid list)
-        displayListCache.put(glListId, compiled);
+        final CompiledDisplayList previous = displayListCache.put(glListId, compiled);
+        if (previous != null && previous != CompiledDisplayList.EMPTY && previous != compiled) {
+            previous.delete();
+        }
 
         // Log compilation details if enabled (before context restoration changes glListId)
         if (LOG_DISPLAY_LIST_COMPILATION) {
@@ -895,7 +913,7 @@ public class DisplayListManager {
         }
 
         // Merge the previous draw call if possible
-        final AccumulatedDraw previous = accumulatedDraws.get(accumulatedDraws.size() - 1);
+        final AccumulatedDraw previous = accumulatedDraws.getLast();
         if (previous.format == tessellator.getVertexFormat() && previous.stateGeneration == stateGeneration) {
             previous.mergeDraw(tessellator, copyLast);
             return;

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/FeedbackManager.java

@@ -345,6 +345,27 @@ public class FeedbackManager {
                 }
                 break;
 
+            case GL11.GL_QUAD_STRIP:
+                for (int i = 0; i + 3 < count; i += 2) {
+                    feedbackToken(GL11.GL_POLYGON_TOKEN);
+                    feedbackToken(4);
+                    emitVertex(reader.read(i), stride);
+                    emitVertex(reader.read(i + 1), stride);
+                    emitVertex(reader.read(i + 3), stride);
+                    emitVertex(reader.read(i + 2), stride);
+                }
+                break;
+
+            case GL11.GL_POLYGON:
+                if (count >= 3) {
+                    feedbackToken(GL11.GL_POLYGON_TOKEN);
+                    feedbackToken(count);
+                    for (int i = 0; i < count; i++) {
+                        emitVertex(reader.read(i), stride);
+                    }
+                }
+                break;
+
             default:
                 throw new UnsupportedOperationException("Feedback mode: unsupported primitive mode 0x" + Integer.toHexString(mode));
         }

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/GLStateManager.java

@@ -17,6 +17,7 @@ import com.gtnewhorizons.angelica.glsm.hooks.GLSMInitConfig;
 import com.gtnewhorizons.angelica.glsm.recording.CommandRecorder;
 import com.gtnewhorizons.angelica.glsm.recording.CompiledDisplayList;
 import com.gtnewhorizons.angelica.glsm.recording.ImmediateModeRecorder;
+import com.gtnewhorizons.angelica.glsm.recording.commands.IndexedDrawCapture;
 import com.gtnewhorizons.angelica.glsm.recording.commands.TexImage2DCmd;
 import com.gtnewhorizons.angelica.glsm.recording.commands.TexSubImage2DCmd;
 import com.gtnewhorizons.angelica.glsm.stacks.AlphaStateStack;
@@ -43,6 +44,7 @@ import com.gtnewhorizons.angelica.glsm.states.TextureUnitArray;
 import com.gtnewhorizons.angelica.glsm.states.VertexAttribState;
 import com.gtnewhorizons.angelica.glsm.texture.TextureInfo;
 import com.gtnewhorizons.angelica.glsm.texture.TextureInfoCache;
+import it.unimi.dsi.fastutil.ints.Int2IntMap;
 import it.unimi.dsi.fastutil.ints.Int2IntOpenHashMap;
 import it.unimi.dsi.fastutil.ints.IntArrayList;
 import it.unimi.dsi.fastutil.ints.IntOpenHashSet;
@@ -419,6 +421,9 @@ public class GLStateManager {
     @Getter protected static int boundVBO;
     @Getter protected static int boundEBO;
     @Getter protected static int boundVAO;
+    private static int clientArraysVBO = 0;
+    private static int clientArraysVBOCapacity = 0;
+    private static final int[] clientArraysVBOOffsets = new int[VertexAttribState.MAX_ATTRIBS];
     private static int boundPixelUnpackBuffer;
     private static int boundPixelPackBuffer;
     private static final Int2IntOpenHashMap vaoEboMap = new Int2IntOpenHashMap();
@@ -946,10 +951,11 @@ public class GLStateManager {
 
         switch (pname) {
             case GL11.GL_COLOR_WRITEMASK -> {
-                params.put((byte) (colorMask.red ? GL11.GL_TRUE : GL11.GL_FALSE));
-                params.put((byte) (colorMask.green ? GL11.GL_TRUE : GL11.GL_FALSE));
-                params.put((byte) (colorMask.blue ? GL11.GL_TRUE : GL11.GL_FALSE));
-                params.put((byte) (colorMask.alpha ? GL11.GL_TRUE : GL11.GL_FALSE));
+                final int pos = params.position();
+                params.put(pos, (byte) (colorMask.red ? GL11.GL_TRUE : GL11.GL_FALSE));
+                params.put(pos + 1, (byte) (colorMask.green ? GL11.GL_TRUE : GL11.GL_FALSE));
+                params.put(pos + 2, (byte) (colorMask.blue ? GL11.GL_TRUE : GL11.GL_FALSE));
+                params.put(pos + 3, (byte) (colorMask.alpha ? GL11.GL_TRUE : GL11.GL_FALSE));
             }
             default -> {
                 if (!HAS_MULTIPLE_SET.contains(pname)) {
@@ -1060,7 +1066,7 @@ public class GLStateManager {
             case GL11.GL_DIFFUSE -> state.diffuse.get(0, params);
             case GL11.GL_SPECULAR -> state.specular.get(0, params);
             case GL11.GL_EMISSION -> state.emission.get(0, params);
-            case GL11.GL_SHININESS -> params.put(state.shininess);
+            case GL11.GL_SHININESS -> params.put(params.position(), state.shininess);
             case GL11.GL_COLOR_INDEXES -> state.colorIndexes.get(0, params);
             default -> {
             }
@@ -1075,11 +1081,11 @@ public class GLStateManager {
             case GL11.GL_SPECULAR -> state.specular.get(0, params);
             case GL11.GL_POSITION -> state.position.get(0, params);
             case GL11.GL_SPOT_DIRECTION -> state.spotDirection.get(0, params);
-            case GL11.GL_SPOT_EXPONENT -> params.put(state.spotExponent);
-            case GL11.GL_SPOT_CUTOFF -> params.put(state.spotCutoff);
-            case GL11.GL_CONSTANT_ATTENUATION -> params.put(state.constantAttenuation);
-            case GL11.GL_LINEAR_ATTENUATION -> params.put(state.linearAttenuation);
-            case GL11.GL_QUADRATIC_ATTENUATION -> params.put(state.quadraticAttenuation);
+            case GL11.GL_SPOT_EXPONENT -> params.put(params.position(), state.spotExponent);
+            case GL11.GL_SPOT_CUTOFF -> params.put(params.position(), state.spotCutoff);
+            case GL11.GL_CONSTANT_ATTENUATION -> params.put(params.position(), state.constantAttenuation);
+            case GL11.GL_LINEAR_ATTENUATION -> params.put(params.position(), state.linearAttenuation);
+            case GL11.GL_QUADRATIC_ATTENUATION -> params.put(params.position(), state.quadraticAttenuation);
             default -> {
             }
         }
@@ -1098,21 +1104,39 @@ public class GLStateManager {
             case GL11.GL_COLOR_CLEAR_VALUE -> clearColor.get(params);
             case GL11.GL_CURRENT_COLOR -> color.get(params);
             case GL11.GL_DEPTH_RANGE -> {
-                params.put((float) viewportState.depthRangeNear);
-                params.put((float) viewportState.depthRangeFar);
+                final int pos = params.position();
+                params.put(pos, (float) viewportState.depthRangeNear);
+                params.put(pos + 1, (float) viewportState.depthRangeFar);
+            }
+            case GL14.GL_BLEND_COLOR -> {
+                final int pos = params.position();
+                params.put(pos, blendState.getBlendColorR());
+                params.put(pos + 1, blendState.getBlendColorG());
+                params.put(pos + 2, blendState.getBlendColorB());
+                params.put(pos + 3, blendState.getBlendColorA());
             }
-            case GL14.GL_BLEND_COLOR -> params.put(blendState.getBlendColorR()).put(blendState.getBlendColorG()).put(blendState.getBlendColorB()).put(blendState.getBlendColorA());
             case GL11.GL_CURRENT_NORMAL -> {
                 final Vector3f normal = ShaderManager.getCurrentNormal();
-                params.put(normal.x).put(normal.y).put(normal.z);
+                final int pos = params.position();
+                params.put(pos, normal.x);
+                params.put(pos + 1, normal.y);
+                params.put(pos + 2, normal.z);
             }
             case GL11.GL_CURRENT_TEXTURE_COORDS -> {
                 final Vector4f tc = ShaderManager.getCurrentTexCoord();
-                params.put(tc.x).put(tc.y).put(tc.z).put(tc.w);
+                final int pos = params.position();
+                params.put(pos, tc.x);
+                params.put(pos + 1, tc.y);
+                params.put(pos + 2, tc.z);
+                params.put(pos + 3, tc.w);
             }
             case GL11.GL_FOG_COLOR -> {
                 final FloatBuffer fogBuf = fogState.getFogColorBuffer();
-                params.put(fogBuf.get(0)).put(fogBuf.get(1)).put(fogBuf.get(2)).put(fogBuf.get(3));
+                final int pos = params.position();
+                params.put(pos, fogBuf.get(0));
+                params.put(pos + 1, fogBuf.get(1));
+                params.put(pos + 2, fogBuf.get(2));
+                params.put(pos + 3, fogBuf.get(3));
             }
             case GL11.GL_LIGHT_MODEL_AMBIENT -> lightModel.ambient.get(0, params);
             default -> {
@@ -1614,6 +1638,9 @@ public class GLStateManager {
         }
         alphaTest.enable();
         fragmentGeneration++;
+        if (GLSMHooks.ALPHA_STATE_CHANGE.hasListeners()) {
+            GLSMHooks.ALPHA_STATE_CHANGE.post(GLSMHooks.alphaStateChangeEvent);
+        }
     }
 
     public static void disableAlphaTest() {
@@ -1631,6 +1658,9 @@ public class GLStateManager {
         }
         alphaTest.disable();
         fragmentGeneration++;
+        if (GLSMHooks.ALPHA_STATE_CHANGE.hasListeners()) {
+            GLSMHooks.ALPHA_STATE_CHANGE.post(GLSMHooks.alphaStateChangeEvent);
+        }
     }
 
     public static void glAlphaFunc(int function, float reference) {
@@ -1650,6 +1680,9 @@ public class GLStateManager {
             alphaState.setFunction(function);
             alphaState.setReference(reference);
             fragmentGeneration++;
+            if (GLSMHooks.ALPHA_STATE_CHANGE.hasListeners()) {
+                GLSMHooks.ALPHA_STATE_CHANGE.post(GLSMHooks.alphaStateChangeEvent);
+            }
         }
     }
 
@@ -2145,6 +2178,7 @@ public class GLStateManager {
         }
         prepareWideLineEmulation(mode);
         ShaderManager.getInstance().preDraw();
+        prepareClientArrays();
         RENDER_BACKEND.drawElements(mode, indices);
     }
 
@@ -2158,6 +2192,7 @@ public class GLStateManager {
         }
         prepareWideLineEmulation(mode);
         ShaderManager.getInstance().preDraw();
+        prepareClientArrays();
         if (mode == GL11.GL_QUADS) {
             QuadConverter.drawQuadElementsAsTriangles(indices);
         } else {
@@ -2175,6 +2210,7 @@ public class GLStateManager {
         }
         prepareWideLineEmulation(mode);
         ShaderManager.getInstance().preDraw();
+        prepareClientArrays();
         if (mode == GL11.GL_QUADS) {
             QuadConverter.drawQuadElementsAsTriangles(indices);
         } else {
@@ -2192,6 +2228,7 @@ public class GLStateManager {
         }
         prepareWideLineEmulation(mode);
         ShaderManager.getInstance().preDraw();
+        prepareClientArrays();
         if (mode == GL11.GL_QUADS) {
             QuadConverter.drawQuadElementsAsTriangles(count, type, indices);
         } else {
@@ -2203,15 +2240,12 @@ public class GLStateManager {
         CommandRecorder savedRecorder = null;
         final RecordMode recordMode = DisplayListManager.getRecordMode();
         if (recordMode != RecordMode.NONE) {
-            if (isVAOBound()) {
-                DisplayListManager.recordDrawElements(mode, indices_count, type, indices_buffer_offset);
-            } else if (isVBOBound() || VertexAttribState.hasVBOBoundAttrib()) {
-                final DirectTessellator result = ImmediateModeRecorder.processDrawElementsFromVBO(mode, indices_count, type, indices_buffer_offset, boundEBO);
-                if (result != null) {
-                    DisplayListManager.addImmediateModeDraw(result);
-                }
-            } else {
-                throw new UnsupportedOperationException("glDrawElements in display lists not yet implemented - if you see this, please report!");
+            // Core profile: a default VAO is generated at init and glBindVertexArray(0)
+            // is redirected to it, so a VAO is always bound here — no fallback branches.
+            DisplayListManager.flushMatrix();
+            final IndexedDrawCapture capture = IndexedDrawCapture.create(mode, indices_count, type, indices_buffer_offset, boundEBO);
+            if (capture != null) {
+                DisplayListManager.recordIndexedDrawCapture(capture);
             }
             if (recordMode == RecordMode.COMPILE) {
                 return;
@@ -2223,6 +2257,7 @@ public class GLStateManager {
         }
         prepareWideLineEmulation(mode);
         ShaderManager.getInstance().preDraw();
+        prepareClientArrays();
         if (mode == GL11.GL_QUADS) {
             QuadConverter.drawQuadElementsAsTriangles(indices_count, type, indices_buffer_offset);
         } else {
@@ -2245,20 +2280,72 @@ public class GLStateManager {
 
     public static void glMultiDrawElementsIndirect(int mode, int type, long indirect, int drawcount, int stride) {
         ShaderManager.getInstance().preDraw();
+        prepareClientArrays();
         RENDER_BACKEND.multiDrawElementsIndirect(mode, type, indirect, drawcount, stride);
     }
 
     public static void glMultiDrawElementsBaseVertex(int mode, long pCount, int type, long pIndices, int drawcount, long pBaseVertex) {
         ShaderManager.getInstance().preDraw();
+        prepareClientArrays();
         RENDER_BACKEND.multiDrawElementsBaseVertex(mode, pCount, type, pIndices, drawcount, pBaseVertex);
     }
 
     public static void glDrawElementsBaseVertex(int mode, int count, int type, long indices, int basevertex) {
         ShaderManager.getInstance().preDraw();
+        prepareClientArrays();
         RENDER_BACKEND.drawElementsBaseVertex(mode, count, type, indices, basevertex);
     }
 
-    public static void glDrawElementsInstanced(int mode, int count, int type, long indices, int primcount) { RENDER_BACKEND.drawElementsInstanced(mode, count, type, indices, primcount); }
+    public static void glDrawElementsInstanced(int mode, int count, int type, long indices, int primcount) {
+        ShaderManager.getInstance().preDraw();
+        prepareClientArrays();
+        RENDER_BACKEND.drawElementsInstanced(mode, count, type, indices, primcount);
+    }
+
+    private static void prepareClientArrays() {
+        if (ShaderManager.getInstance().isEnabled() && VertexAttribState.hasAnyClientSideEnabledAttrib()) {
+            uploadClientArraysToVBO();
+        }
+    }
+
+    /**
+     * If any enabled vertex attribute uses a client-side pointer (no VBO), upload all such
+     * attribs into a shared stream VBO so the draw succeeds under core profile.
+     */
+    private static void uploadClientArraysToVBO() {
+        int totalBytes = 0;
+        for (int i = 0; i < VertexAttribState.MAX_ATTRIBS; i++) {
+            clientArraysVBOOffsets[i] = -1;
+            final VertexAttribState.Attrib a = VertexAttribState.get(i);
+            if (!a.enabled || a.clientPointer == null) continue;
+            clientArraysVBOOffsets[i] = totalBytes;
+            totalBytes += a.clientPointer.remaining();
+        }
+        if (totalBytes == 0) return;
+
+        if (clientArraysVBO == 0) {
+            clientArraysVBO = RENDER_BACKEND.genBuffers();
+        }
+
+        final int savedVBO = boundVBO;
+        glBindBuffer(GL15.GL_ARRAY_BUFFER, clientArraysVBO);
+
+        if (totalBytes > clientArraysVBOCapacity) {
+            int newCap = Math.max(4096, clientArraysVBOCapacity);
+            while (newCap < totalBytes) newCap *= 2;
+            clientArraysVBOCapacity = newCap;
+        }
+        RENDER_BACKEND.bufferData(GL15.GL_ARRAY_BUFFER, clientArraysVBOCapacity, GL15.GL_STREAM_DRAW);
+
+        for (int i = 0; i < VertexAttribState.MAX_ATTRIBS; i++) {
+            if (clientArraysVBOOffsets[i] < 0) continue;
+            final VertexAttribState.Attrib a = VertexAttribState.get(i);
+            RENDER_BACKEND.bufferSubData(GL15.GL_ARRAY_BUFFER, clientArraysVBOOffsets[i], a.clientPointer.duplicate());
+            RENDER_BACKEND.vertexAttribPointer(i, a.size, a.type, a.normalized, a.stride, (long) clientArraysVBOOffsets[i]);
+        }
+
+        glBindBuffer(GL15.GL_ARRAY_BUFFER, savedVBO);
+    }
 
     public static void glDrawArrays(int mode, int first, int count) {
         CommandRecorder savedRecorder = null;
@@ -2278,8 +2365,13 @@ public class GLStateManager {
         }
         prepareWideLineEmulation(mode);
         ShaderManager.getInstance().preDraw();
+        prepareClientArrays();
         if (mode == GL11.GL_QUADS) {
             QuadConverter.drawQuadsAsTriangles(first, count);
+        } else if (mode == GL11.GL_QUAD_STRIP) {
+            RENDER_BACKEND.drawArrays(GL11.GL_TRIANGLE_STRIP, first, count & ~1);
+        } else if (mode == GL11.GL_POLYGON) {
+            RENDER_BACKEND.drawArrays(GL11.GL_TRIANGLE_FAN, first, count);
         } else {
             RENDER_BACKEND.drawArrays(mode, first, count);
         }
@@ -2298,6 +2390,10 @@ public class GLStateManager {
         glVertexAttribPointer(Usage.POSITION.getAttributeLocation(), size, GL11.GL_FLOAT, false, stride, MemoryUtilities.memByteBuffer(pointer));
     }
 
+    public static void glVertexPointer(int size, int stride, DoubleBuffer pointer) {
+        glVertexAttribPointer(Usage.POSITION.getAttributeLocation(), size, GL11.GL_DOUBLE, false, stride, MemoryUtilities.memByteBuffer(pointer));
+    }
+
     public static void glVertexPointer(int size, int type, int stride, ByteBuffer pointer) {
         glVertexAttribPointer(Usage.POSITION.getAttributeLocation(), size, type, false, stride, pointer);
     }
@@ -2339,6 +2435,10 @@ public class GLStateManager {
         glNormalPointer(GL11.GL_INT, stride, pointer);
     }
 
+    public static void glNormalPointer(int stride, DoubleBuffer pointer) {
+        glNormalPointer(GL11.GL_DOUBLE, stride, pointer);
+    }
+
     public static void glNormalPointer(int type, int stride, ByteBuffer pointer) {
         glVertexAttribPointer(Usage.NORMAL.getAttributeLocation(), 3, type, Usage.NORMAL.isNormalized(), stride, pointer);
     }
@@ -2355,6 +2455,10 @@ public class GLStateManager {
         glVertexAttribPointer(Usage.NORMAL.getAttributeLocation(), 3, GL11.GL_INT, Usage.NORMAL.isNormalized(), stride, MemoryUtilities.memByteBuffer(pointer));
     }
 
+    public static void glNormalPointer(int type, int stride, DoubleBuffer pointer) {
+        glVertexAttribPointer(Usage.NORMAL.getAttributeLocation(), 3, GL11.GL_DOUBLE, Usage.NORMAL.isNormalized(), stride, MemoryUtilities.memByteBuffer(pointer));
+    }
+
     public static void glNormalPointer(int type, int stride, long pointer_buffer_offset) {
         glVertexAttribPointer(Usage.NORMAL.getAttributeLocation(), 3, type, Usage.NORMAL.isNormalized(), stride, pointer_buffer_offset);
     }
@@ -2377,6 +2481,10 @@ public class GLStateManager {
         glTexCoordPointer(size, GL11.GL_SHORT, stride, pointer);
     }
 
+    public static void glTexCoordPointer(int size, int stride, DoubleBuffer pointer) {
+        glTexCoordPointer(size, GL11.GL_DOUBLE, stride, pointer);
+    }
+
     public static void glTexCoordPointer(int size, int type, int stride, FloatBuffer pointer) {
         final int loc = texCoordAttributeLocation();
         if (loc < 0) return;
@@ -2395,6 +2503,12 @@ public class GLStateManager {
         glVertexAttribPointer(loc, size, GL11.GL_INT, false, stride, MemoryUtilities.memByteBuffer(pointer));
     }
 
+    public static void glTexCoordPointer(int size, int type, int stride, DoubleBuffer pointer) {
+        final int loc = texCoordAttributeLocation();
+        if (loc < 0) return;
+        glVertexAttribPointer(loc, size, GL11.GL_DOUBLE, false, stride, MemoryUtilities.memByteBuffer(pointer));
+    }
+
     public static void glTexCoordPointer(int size, int type, int stride, long pointer_buffer_offset) {
         final int loc = texCoordAttributeLocation();
         if (loc < 0) return;
@@ -2441,32 +2555,23 @@ public class GLStateManager {
     }
 
     public static void glVertexAttribPointer(int index, int size, int type, boolean normalized, int stride, FloatBuffer pointer) {
-        final ByteBuffer bb = MemoryUtilities.memByteBuffer(pointer);
-        VertexAttribState.set(index, size, type, normalized, stride, bb, boundVBO);
-        RENDER_BACKEND.vertexAttribPointer(index, size, type, normalized, stride, bb);
+        VertexAttribState.set(index, size, type, normalized, stride, MemoryUtilities.memByteBuffer(pointer), 0);
     }
 
     public static void glVertexAttribPointer(int index, int size, int type, boolean normalized, int stride, DoubleBuffer pointer) {
-        final ByteBuffer bb = MemoryUtilities.memByteBuffer(pointer);
-        VertexAttribState.set(index, size, type, normalized, stride, bb, boundVBO);
-        RENDER_BACKEND.vertexAttribPointer(index, size, type, normalized, stride, bb);
+        VertexAttribState.set(index, size, type, normalized, stride, MemoryUtilities.memByteBuffer(pointer), 0);
     }
 
     public static void glVertexAttribPointer(int index, int size, int type, boolean normalized, int stride, IntBuffer pointer) {
-        final ByteBuffer bb = MemoryUtilities.memByteBuffer(pointer);
-        VertexAttribState.set(index, size, type, normalized, stride, bb, boundVBO);
-        RENDER_BACKEND.vertexAttribPointer(index, size, type, normalized, stride, bb);
+        VertexAttribState.set(index, size, type, normalized, stride, MemoryUtilities.memByteBuffer(pointer), 0);
     }
 
     public static void glVertexAttribPointer(int index, int size, int type, boolean normalized, int stride, ShortBuffer pointer) {
-        final ByteBuffer bb = MemoryUtilities.memByteBuffer(pointer);
-        VertexAttribState.set(index, size, type, normalized, stride, bb, boundVBO);
-        RENDER_BACKEND.vertexAttribPointer(index, size, type, normalized, stride, bb);
+        VertexAttribState.set(index, size, type, normalized, stride, MemoryUtilities.memByteBuffer(pointer), 0);
     }
 
     public static void glVertexAttribPointer(int index, int size, int type, boolean normalized, int stride, ByteBuffer pointer) {
-        VertexAttribState.set(index, size, type, normalized, stride, pointer, boundVBO);
-        RENDER_BACKEND.vertexAttribPointer(index, size, type, normalized, stride, pointer);
+        VertexAttribState.set(index, size, type, normalized, stride, pointer, 0);
     }
 
     public static void glVertexAttribIPointer(int index, int size, int type, int stride, long offset) {
@@ -2475,20 +2580,15 @@ public class GLStateManager {
     }
 
     public static void glVertexAttribIPointer(int index, int size, int type, int stride, ByteBuffer pointer) {
-        VertexAttribState.set(index, size, type, false, stride, pointer, boundVBO);
-        RENDER_BACKEND.vertexAttribIPointer(index, size, type, stride, pointer);
+        VertexAttribState.set(index, size, type, false, stride, pointer, 0);
     }
 
     public static void glVertexAttribIPointer(int index, int size, int type, int stride, IntBuffer pointer) {
-        final ByteBuffer bb = MemoryUtilities.memByteBuffer(pointer);
-        VertexAttribState.set(index, size, type, false, stride, bb, boundVBO);
-        RENDER_BACKEND.vertexAttribIPointer(index, size, type, stride, bb);
+        VertexAttribState.set(index, size, type, false, stride, MemoryUtilities.memByteBuffer(pointer), 0);
     }
 
     public static void glVertexAttribIPointer(int index, int size, int type, int stride, ShortBuffer pointer) {
-        final ByteBuffer bb = MemoryUtilities.memByteBuffer(pointer);
-        VertexAttribState.set(index, size, type, false, stride, bb, boundVBO);
-        RENDER_BACKEND.vertexAttribIPointer(index, size, type, stride, bb);
+        VertexAttribState.set(index, size, type, false, stride, MemoryUtilities.memByteBuffer(pointer), 0);
     }
 
     public static void glVertexAttribDivisor(int index, int divisor) { RENDER_BACKEND.vertexAttribDivisor(index, divisor); }
@@ -4297,9 +4397,20 @@ public class GLStateManager {
         RENDER_BACKEND.finish();
     }
 
-    public static int glGetError() { return RENDER_BACKEND.getError(); }
-    public static String glGetString(int pname) { return RENDER_BACKEND.getString(pname); }
-    public static String glGetStringi(int name, int index) { return RENDER_BACKEND.getStringi(name, index); }
+    public static int glGetError() {
+        if (!RENDER_BACKEND.hasContext()) return 0;
+        return RENDER_BACKEND.getError();
+    }
+
+    public static String glGetString(int pname) {
+        if (!RENDER_BACKEND.hasContext()) return "no valid GL/render context";
+        return RENDER_BACKEND.getString(pname);
+    }
+
+    public static String glGetStringi(int name, int index) {
+        if (!RENDER_BACKEND.hasContext()) return "no valid GL/render context";
+        return RENDER_BACKEND.getStringi(name, index);
+    }
 
     public static void glShaderSource(int shader, CharSequence source) {
         String src = source.toString();
@@ -4845,12 +4956,14 @@ public class GLStateManager {
 
     private static void invalidateDeletedBuffer(int buffer) {
         if (buffer == 0) return;
-        if (boundVBO == buffer) {
-            boundVBO = 0;
-        }
-        if (boundEBO == buffer) {
-            boundEBO = 0;
-            vaoEboMap.put(boundVAO, 0);
+        if (boundVBO == buffer) boundVBO = 0;
+        if (boundEBO == buffer) boundEBO = 0;
+        if (boundPixelUnpackBuffer == buffer) boundPixelUnpackBuffer = 0;
+        if (boundPixelPackBuffer == buffer) boundPixelPackBuffer = 0;
+
+        // Sweep all VAOs: an unbound VAO may later rebind with a dangling EBO id.
+        for (Int2IntMap.Entry e : vaoEboMap.int2IntEntrySet()) {
+            if (e.getIntValue() == buffer) e.setValue(0);
         }
     }
 
@@ -4967,14 +5080,6 @@ public class GLStateManager {
         glBindVertexArray(array);
     }
 
-    public static boolean isVBOBound() {
-        return boundVBO != 0;
-    }
-
-    public static boolean isVAOBound() {
-        return boundVAO != 0;
-    }
-
     public static boolean vendorIsAMD() {
         return VENDOR == AMD;
     }
@@ -5558,7 +5663,10 @@ public class GLStateManager {
     }
 
     public static void glDeleteProgram(int program) {
+        if (program == 0) return;
         CompatUniformManager.onDeleteProgram(program);
+
+        if (activeProgram == program) activeProgram = 0;
         RENDER_BACKEND.deleteProgram(program);
     }
 
@@ -5618,6 +5726,14 @@ public class GLStateManager {
         return RENDER_BACKEND.getProgramInfoLog(program);
     }
 
+    public static boolean glIsProgram(int obj) {
+        return RENDER_BACKEND.isProgram(obj);
+    }
+
+    public static boolean glIsShader(int obj) {
+        return RENDER_BACKEND.isShader(obj);
+    }
+
     public static void glBindImageTexture(int unit, int texture, int level, boolean layered, int layer, int access, int format) { RENDER_BACKEND.bindImageTexture(unit, texture, level, layered, layer, access, format); }
     public static void glMemoryBarrier(int barriers) { RENDER_BACKEND.memoryBarrier(barriers); }
     public static void glCopyImageSubData(int srcName, int srcTarget, int srcLevel, int srcX, int srcY, int srcZ,
@@ -5814,5 +5930,7 @@ public class GLStateManager {
     public static void glGetUniform(int program, int location, IntBuffer params) {
         RENDER_BACKEND.getUniformiv(program, location, params);
     }
-
+    public static void glGetTexImage(int target, int level, int format, int type, long pixels) {
+        GL11.glGetTexImage(target, level, format, type, pixels);
+    }
 }

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/GlslTransformUtils.java

@@ -36,8 +36,12 @@ public class GlslTransformUtils {
     /** Reserved words added in later GLSL versions that may appear as identifiers in older shaders. */
     private record ReservedWordRename(Pattern pattern, String replacement) {}
     private static final Map<Integer, List<ReservedWordRename>> VERSIONED_RESERVED_WORDS = Map.of(
-        400, List.of(
+        // Some reserved words to always rename
+        0, List.of(
             new ReservedWordRename(Pattern.compile("\\bsample\\b"), RENAMED_PREFIX + "sample"),
+            new ReservedWordRename(Pattern.compile("\\bnew\\b"), RENAMED_PREFIX + "new")
+        ),
+        400, List.of(
             new ReservedWordRename(Pattern.compile("\\bsampler\\b(?!\\d)"), RENAMED_PREFIX + "sampler")
         )
     );

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/ITessellatorData.java

@@ -0,0 +1,22 @@
+package com.gtnewhorizons.angelica.glsm;
+
+/**
+ * Tessellator data needed by {@link com.gtnewhorizons.angelica.glsm.streaming.TessellatorStreamingDrawer}.
+ */
+public interface ITessellatorData {
+
+    boolean isDrawing();
+    void setDrawing(boolean drawing);
+    int getVertexCount();
+    int[] getRawBuffer();
+    int getRawBufferIndex();
+    int getRawBufferSize();
+    void setRawBufferSize(int size);
+    void setRawBuffer(int[] buffer);
+    int getDrawMode();
+    boolean hasTexture();
+    boolean hasColor();
+    boolean hasNormals();
+    boolean hasBrightness();
+    void angelica$reset();
+}

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/QuadConverter.java

@@ -146,42 +146,11 @@ public final class QuadConverter {
 
         final int bytesPerIndex = VertexAttribState.Attrib.glTypeSizeBytes(type);
 
-        // Read source indices from caller's EBO
         final ByteBuffer src = memAlloc(indexCount * bytesPerIndex);
         RENDER_BACKEND.getBufferSubData(GL15.GL_ELEMENT_ARRAY_BUFFER, offset, src);
-        final long srcAddr = memAddress0(src);
 
-        // Allocate output as GL_UNSIGNED_INT
         final ByteBuffer dst = memAlloc(triIndexCount * 4);
-        final long dstAddr = memAddress0(dst);
-
-        for (int i = 0; i < quadCount; i++) {
-            final int a, b, c, d;
-            switch (type) {
-                case GL11.GL_UNSIGNED_INT -> {
-                    final long p = srcAddr + (long) i * 16;
-                    a = memGetInt(p); b = memGetInt(p + 4); c = memGetInt(p + 8); d = memGetInt(p + 12);
-                }
-                case GL11.GL_UNSIGNED_SHORT -> {
-                    final long p = srcAddr + (long) i * 8;
-                    a = memGetShort(p) & 0xFFFF; b = memGetShort(p + 2) & 0xFFFF;
-                    c = memGetShort(p + 4) & 0xFFFF; d = memGetShort(p + 6) & 0xFFFF;
-                }
-                default /* GL_UNSIGNED_BYTE */ -> {
-                    final long p = srcAddr + (long) i * 4;
-                    a = memGetByte(p) & 0xFF; b = memGetByte(p + 1) & 0xFF;
-                    c = memGetByte(p + 2) & 0xFF; d = memGetByte(p + 3) & 0xFF;
-                }
-            }
-            // GL_LAST_VERTEX_CONVENTION: (a,b,d), (b,c,d)
-            final long o = (long) i * 24;
-            memPutInt(dstAddr + o, a);
-            memPutInt(dstAddr + o + 4, b);
-            memPutInt(dstAddr + o + 8, d);
-            memPutInt(dstAddr + o + 12, b);
-            memPutInt(dstAddr + o + 16, c);
-            memPutInt(dstAddr + o + 20, d);
-        }
+        triangulateQuads(memAddress0(src), type, memAddress0(dst), GL11.GL_UNSIGNED_INT, quadCount);
 
         memFree(src);
         uploadAndDraw(dst, triIndexCount, GL11.GL_UNSIGNED_INT, 4);
@@ -198,16 +167,8 @@ public final class QuadConverter {
         final int triIndexCount = quadCount * 6;
 
         final ByteBuffer dst = memAlloc(triIndexCount * 4);
-        final long dstAddr = memAddress0(dst);
-        final int basePos = indices.position();
-
-        for (int i = 0; i < quadCount; i++) {
-            final int base = basePos + i * 4;
-            final int a = indices.get(base), b = indices.get(base + 1), c = indices.get(base + 2), d = indices.get(base + 3);
-            final long o = (long) i * 24;
-            memPutInt(dstAddr + o, a);     memPutInt(dstAddr + o + 4, b);  memPutInt(dstAddr + o + 8, d);
-            memPutInt(dstAddr + o + 12, b); memPutInt(dstAddr + o + 16, c); memPutInt(dstAddr + o + 20, d);
-        }
+        final long srcAddr = memAddress0(indices) + (long) indices.position() * 4;
+        triangulateQuads(srcAddr, GL11.GL_UNSIGNED_INT, memAddress0(dst), GL11.GL_UNSIGNED_INT, quadCount);
 
         uploadAndDraw(dst, triIndexCount, GL11.GL_UNSIGNED_INT, 4);
     }
@@ -223,16 +184,8 @@ public final class QuadConverter {
         final int triIndexCount = quadCount * 6;
 
         final ByteBuffer dst = memAlloc(triIndexCount * 2);
-        final long dstAddr = memAddress0(dst);
-        final int basePos = indices.position();
-
-        for (int i = 0; i < quadCount; i++) {
-            final int base = basePos + i * 4;
-            final short a = indices.get(base), b = indices.get(base + 1), c = indices.get(base + 2), d = indices.get(base + 3);
-            final long o = (long) i * 12;
-            memPutShort(dstAddr + o, a);     memPutShort(dstAddr + o + 2, b);  memPutShort(dstAddr + o + 4, d);
-            memPutShort(dstAddr + o + 6, b); memPutShort(dstAddr + o + 8, c);  memPutShort(dstAddr + o + 10, d);
-        }
+        final long srcAddr = memAddress0(indices) + (long) indices.position() * 2;
+        triangulateQuads(srcAddr, GL11.GL_UNSIGNED_SHORT, memAddress0(dst), GL11.GL_UNSIGNED_SHORT, quadCount);
 
         uploadAndDraw(dst, triIndexCount, GL11.GL_UNSIGNED_SHORT, 2);
     }
@@ -248,31 +201,7 @@ public final class QuadConverter {
         final long srcAddr = memAddress0(indices) + indices.position();
 
         final ByteBuffer dst = memAlloc(triIndexCount * 4);
-        final long dstAddr = memAddress0(dst);
-
-        for (int i = 0; i < quadCount; i++) {
-            final int a, b, c, d;
-            switch (type) {
-                case GL11.GL_UNSIGNED_INT -> {
-                    final long p = srcAddr + (long) i * 16;
-                    a = memGetInt(p); b = memGetInt(p + 4); c = memGetInt(p + 8); d = memGetInt(p + 12);
-                }
-                case GL11.GL_UNSIGNED_SHORT -> {
-                    final long p = srcAddr + (long) i * 8;
-                    a = memGetShort(p) & 0xFFFF; b = memGetShort(p + 2) & 0xFFFF;
-                    c = memGetShort(p + 4) & 0xFFFF; d = memGetShort(p + 6) & 0xFFFF;
-                }
-                case GL11.GL_UNSIGNED_BYTE -> {
-                    final long p = srcAddr + (long) i * 4;
-                    a = memGetByte(p) & 0xFF; b = memGetByte(p + 1) & 0xFF;
-                    c = memGetByte(p + 2) & 0xFF; d = memGetByte(p + 3) & 0xFF;
-                }
-                default -> { memFree(dst); return; }
-            }
-            final long o = (long) i * 24;
-            memPutInt(dstAddr + o, a);     memPutInt(dstAddr + o + 4, b);  memPutInt(dstAddr + o + 8, d);
-            memPutInt(dstAddr + o + 12, b); memPutInt(dstAddr + o + 16, c); memPutInt(dstAddr + o + 20, d);
-        }
+        triangulateQuads(srcAddr, type, memAddress0(dst), GL11.GL_UNSIGNED_INT, quadCount);
 
         uploadAndDraw(dst, triIndexCount, GL11.GL_UNSIGNED_INT, 4);
     }
@@ -282,14 +211,140 @@ public final class QuadConverter {
      */
     public static void destroy() {
         if (eboId != 0) {
-            RENDER_BACKEND.deleteBuffers(eboId);
+            GLStateManager.glDeleteBuffers(eboId);
             eboId = 0;
             maxQuads = 0;
         }
         if (scratchEboId != 0) {
-            RENDER_BACKEND.deleteBuffers(scratchEboId);
+            GLStateManager.glDeleteBuffers(scratchEboId);
             scratchEboId = 0;
             scratchEboCapacity = 0;
         }
     }
+
+    /**
+     * Read one index at {@code srcAddr + i * sizeof(srcType)} and return its
+     * zero-extended unsigned value.
+     */
+    private static int readIndex(long srcAddr, int srcType, int i) {
+        return switch (srcType) {
+            case GL11.GL_UNSIGNED_BYTE  -> memGetByte(srcAddr + i)          & 0xFF;
+            case GL11.GL_UNSIGNED_SHORT -> memGetShort(srcAddr + i * 2L)    & 0xFFFF;
+            case GL11.GL_UNSIGNED_INT   -> memGetInt(srcAddr + i * 4L);
+            default -> throw new IllegalArgumentException("unsupported index type 0x" + Integer.toHexString(srcType));
+        };
+    }
+
+    /**
+     * Write one index at {@code dstAddr + i * sizeof(dstType)}.
+     */
+    private static void writeIndex(long dstAddr, int dstType, int i, int value) {
+        switch (dstType) {
+            case GL11.GL_UNSIGNED_SHORT -> memPutShort(dstAddr + i * 2L, (short) value);
+            case GL11.GL_UNSIGNED_INT   -> memPutInt(dstAddr + i * 4L, value);
+            default -> throw new IllegalArgumentException("unsupported index type 0x" + Integer.toHexString(dstType));
+        }
+    }
+
+    /**
+     * Read {@code quadCount} quads from {@code srcAddr} and emit 6 triangle indices
+     * per quad at {@code dstAddr} using {@code GL_LAST_VERTEX_CONVENTION}:
+     * {@code (a,b,d), (b,c,d)}. v3 is the provoking vertex for both triangles;
+     * diagonal runs b→d. Matches Mesa's {@code do_quad} LAST path.
+     *
+     * <p>Caller allocates dst of size {@code quadCount * 6 * sizeof(dstType)}.
+     *
+     * <p>Supported src types: {@code GL_UNSIGNED_BYTE} / {@code GL_UNSIGNED_SHORT}
+     * / {@code GL_UNSIGNED_INT}. Supported dst types: {@code GL_UNSIGNED_SHORT} /
+     * {@code GL_UNSIGNED_INT}. Widening only.
+     */
+    public static void triangulateQuads(long srcAddr, int srcType, long dstAddr, int dstType, int quadCount) {
+        triangulateQuads(srcAddr, srcType, dstAddr, dstType, quadCount, 0);
+    }
+
+    /**
+     * Same as {@link #triangulateQuads(long, int, long, int, int)} but subtracts
+     * {@code minVtx} from every emitted index, rebasing to a 0-based buffer in
+     * one pass.
+     */
+    public static void triangulateQuads(long srcAddr, int srcType, long dstAddr, int dstType, int quadCount, int minVtx) {
+        for (int i = 0; i < quadCount; i++) {
+            final int a = readIndex(srcAddr, srcType, i * 4)     - minVtx;
+            final int b = readIndex(srcAddr, srcType, i * 4 + 1) - minVtx;
+            final int c = readIndex(srcAddr, srcType, i * 4 + 2) - minVtx;
+            final int d = readIndex(srcAddr, srcType, i * 4 + 3) - minVtx;
+            final int o = i * 6;
+            writeIndex(dstAddr, dstType, o,     a);
+            writeIndex(dstAddr, dstType, o + 1, b);
+            writeIndex(dstAddr, dstType, o + 2, d);
+            writeIndex(dstAddr, dstType, o + 3, b);
+            writeIndex(dstAddr, dstType, o + 4, c);
+            writeIndex(dstAddr, dstType, o + 5, d);
+        }
+    }
+
+    /**
+     * Copy {@code count} indices from {@code srcAddr} to {@code dstAddr}, converting
+     * from {@code srcType} to {@code dstType}.
+     *
+     * <p>Supported src types: {@code GL_UNSIGNED_BYTE} / {@code GL_UNSIGNED_SHORT} /
+     * {@code GL_UNSIGNED_INT}. Supported dst types: {@code GL_UNSIGNED_SHORT} /
+     * {@code GL_UNSIGNED_INT}. Widening only; narrowing is rejected by
+     * {@link #writeIndex(long, int, int, int) writeIndex}.
+     */
+    public static void widenIndices(long srcAddr, int srcType, long dstAddr, int dstType, int count) {
+        widenIndices(srcAddr, srcType, dstAddr, dstType, count, 0);
+    }
+
+    /**
+     * Same as {@link #widenIndices(long, int, long, int, int)} but subtracts
+     * {@code minVtx} from every written index in one pass.
+     */
+    public static void widenIndices(long srcAddr, int srcType, long dstAddr, int dstType, int count, int minVtx) {
+        for (int i = 0; i < count; i++) {
+            writeIndex(dstAddr, dstType, i, readIndex(srcAddr, srcType, i) - minVtx);
+        }
+    }
+
+    /**
+     * Scan {@code count} indices at {@code srcAddr} of {@code srcType}. Returns
+     * {@code (max << 32) | (min & 0xFFFFFFFFL)} or {@code -1L} for an unsupported
+     * type or empty range.
+     */
+    public static long scanMinMaxIndex(long srcAddr, int srcType, int count) {
+        if (count <= 0) return -1L;
+        long min = Long.MAX_VALUE;
+        long max = Long.MIN_VALUE;
+        switch (srcType) {
+            case GL11.GL_UNSIGNED_BYTE -> {
+                for (int i = 0; i < count; i++) {
+                    final int v = memGetByte(srcAddr + i) & 0xFF;
+                    if (v < min) min = v;
+                    if (v > max) max = v;
+                }
+            }
+            case GL11.GL_UNSIGNED_SHORT -> {
+                for (int i = 0; i < count; i++) {
+                    final int v = memGetShort(srcAddr + i * 2L) & 0xFFFF;
+                    if (v < min) min = v;
+                    if (v > max) max = v;
+                }
+            }
+            case GL11.GL_UNSIGNED_INT -> {
+                for (int i = 0; i < count; i++) {
+                    final long v = memGetInt(srcAddr + i * 4L) & 0xFFFFFFFFL;
+                    if (v < min) min = v;
+                    if (v > max) max = v;
+                }
+                // readIndex / writeIndex / rebase all route UINT through signed int.
+                // Reject the > 2^31 slice so the caller bails rather than silently
+                // emitting negative indices. MC never hits this in practice.
+                if (max > Integer.MAX_VALUE) return -1L;
+            }
+            default -> {
+                return -1L;
+            }
+        }
+        return (max << 32) | (min & 0xFFFFFFFFL);
+    }
 }

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/RenderSystem.java

@@ -432,7 +432,7 @@ public class RenderSystem {
     }
 
     public static void deleteBuffers(int buffer) {
-        RENDER_BACKEND.deleteBuffers(buffer);
+        GLStateManager.glDeleteBuffers(buffer);
     }
 
     public static long getVRAM() {
@@ -491,7 +491,7 @@ public class RenderSystem {
 
     public static void destroySampler(int sampler) {
         if (!supportsSamplerObjects || sampler == 0) return;
-        RENDER_BACKEND.deleteSamplers(sampler);
+        GLStateManager.glDeleteSamplers(sampler);
     }
 
     public static void samplerParameteri(int sampler, int pname, int param) {

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/backend/Lwjgl2GLRenderBackend.java

@@ -9,6 +9,7 @@ import org.lwjgl.opengl.ARBDebugOutputCallback;
 import org.lwjgl.opengl.ARBDirectStateAccess;
 import org.lwjgl.opengl.ContextCapabilities;
 import org.lwjgl.opengl.EXTDirectStateAccess;
+import org.lwjgl.opengl.GLContext;
 import org.lwjgl.opengl.GL11;
 import org.lwjgl.opengl.GL12;
 import org.lwjgl.opengl.GL13;
@@ -67,7 +68,7 @@ public final class Lwjgl2GLRenderBackend extends RenderBackend {
 
     @Override
     public void init() {
-        caps = org.lwjgl.opengl.GLContext.getCapabilities();
+        caps = GLContext.getCapabilities();
         activeDebugExtension = 0;
     }
 
@@ -86,6 +87,15 @@ public final class Lwjgl2GLRenderBackend extends RenderBackend {
         return "OpenGL (LWJGL2)";
     }
 
+    @Override
+    public boolean hasContext() {
+        try {
+            return GLContext.getCapabilities() != null;
+        } catch (Exception e) {
+            return false;
+        }
+    }
+
     @Override
     public int getMinGLSLVersion() {return 330;}
 

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/backend/RenderBackend.java

@@ -19,6 +19,9 @@ public abstract class RenderBackend {
     public abstract boolean isAvailable();
     public abstract String getName();
 
+    /** Returns true if the current thread has a valid render context. Safe to call from any thread. */
+    public abstract boolean hasContext();
+
     /** Higher priority backends are preferred. */
     public int getPriority() { return 0; }
 

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/ffp/FragmentShaderGenerator.java

@@ -273,21 +273,27 @@ public final class FragmentShaderGenerator {
         sb.append("  // Alpha test\n");
         final int func = FragmentKey.decodeAlphaFunc(key.alphaTestFunc());
 
+
+        sb.append("  float qa = round(color.a * 255.0);\n");
         switch (func) {
             case GL11.GL_NEVER ->
                 sb.append("  discard;\n");
             case GL11.GL_LESS ->
-                sb.append("  if (color.a >= u_AlphaRef) discard;\n");
-            case GL11.GL_EQUAL ->
-                sb.append("  if (color.a != u_AlphaRef) discard;\n");
+                sb.append("  if (qa >= u_AlphaRef * 255.0) discard;\n");
+            case GL11.GL_EQUAL -> {
+                sb.append("  float qr = round(u_AlphaRef * 255.0);\n");
+                sb.append("  if (qa != qr) discard;\n");
+            }
             case GL11.GL_LEQUAL ->
-                sb.append("  if (color.a > u_AlphaRef) discard;\n");
+                sb.append("  if (qa > u_AlphaRef * 255.0) discard;\n");
             case GL11.GL_GREATER ->
-                sb.append("  if (color.a <= u_AlphaRef) discard;\n");
-            case GL11.GL_NOTEQUAL ->
-                sb.append("  if (color.a == u_AlphaRef) discard;\n");
+                sb.append("  if (qa <= u_AlphaRef * 255.0) discard;\n");
+            case GL11.GL_NOTEQUAL -> {
+                sb.append("  float qr = round(u_AlphaRef * 255.0);\n");
+                sb.append("  if (qa == qr) discard;\n");
+            }
             case GL11.GL_GEQUAL ->
-                sb.append("  if (color.a < u_AlphaRef) discard;\n");
+                sb.append("  if (qa < u_AlphaRef * 255.0) discard;\n");
             case GL11.GL_ALWAYS -> {}
         }
     }

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/ffp/Program.java

@@ -178,7 +178,7 @@ public class Program {
     }
 
     public void destroy() {
-        RENDER_BACKEND.deleteProgram(programId);
+        GLStateManager.glDeleteProgram(programId);
     }
 
     /**

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/hooks/GLSMHooks.java

@@ -1,12 +1,6 @@
 package com.gtnewhorizons.angelica.glsm.hooks;
 
-import com.gtnewhorizons.angelica.glsm.hooks.events.BlendFuncChangeEvent;
-import com.gtnewhorizons.angelica.glsm.hooks.events.FogStateChangeEvent;
-import com.gtnewhorizons.angelica.glsm.hooks.events.LightmapCoordsEvent;
-import com.gtnewhorizons.angelica.glsm.hooks.events.ProgramChangeEvent;
-import com.gtnewhorizons.angelica.glsm.hooks.events.TextureBindEvent;
-import com.gtnewhorizons.angelica.glsm.hooks.events.TextureDeleteEvent;
-import com.gtnewhorizons.angelica.glsm.hooks.events.TextureUnitStateEvent;
+import com.gtnewhorizons.angelica.glsm.hooks.events.*;
 import net.minecraftforge.eventbus.api.bus.EventBus;
 
 public final class GLSMHooks {
@@ -23,6 +17,7 @@ public final class GLSMHooks {
     public static final EventBus<BlendFuncChangeEvent> BLEND_FUNC_CHANGE = EventBus.create(BlendFuncChangeEvent.class);
     public static final EventBus<FogStateChangeEvent> FOG_STATE_CHANGE = EventBus.create(FogStateChangeEvent.class);
     public static final EventBus<LightmapCoordsEvent> LIGHTMAP_COORDS = EventBus.create(LightmapCoordsEvent.class);
+    public static final EventBus<AlphaStateChangeEvent> ALPHA_STATE_CHANGE = EventBus.create(AlphaStateChangeEvent.class);
 
     // Reusable event instances
     public static final TextureBindEvent textureBindEvent = new TextureBindEvent();
@@ -32,6 +27,7 @@ public final class GLSMHooks {
     public static final BlendFuncChangeEvent blendFuncChangeEvent = new BlendFuncChangeEvent();
     public static final FogStateChangeEvent fogStateChangeEvent = new FogStateChangeEvent();
     public static final LightmapCoordsEvent lightmapCoordsEvent = new LightmapCoordsEvent();
+    public static final AlphaStateChangeEvent alphaStateChangeEvent = new AlphaStateChangeEvent();
 
     private GLSMHooks() {}
 }

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/hooks/events/AlphaStateChangeEvent.java

@@ -0,0 +1,9 @@
+package com.gtnewhorizons.angelica.glsm.hooks.events;
+
+import net.minecraftforge.eventbus.api.event.MutableEvent;
+
+/**
+ * AlphaTest changed - Listeners should query GLSM alpha state directly if they care what changed.
+ */
+public final class AlphaStateChangeEvent extends MutableEvent {
+}

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/loading/DependencyVerifier.java

@@ -0,0 +1,32 @@
+package com.gtnewhorizons.angelica.glsm.loading;
+
+import java.util.List;
+
+/**
+ * Verifies required classes/resources are present on the classpath at load time.
+ * Fails fast with a descriptive error message if a dependency is missing.
+ */
+public final class DependencyVerifier {
+
+    /**
+     * A single dependency check: a classpath resource that must exist.
+     * @param resourcePath  Resource path to check (e.g. "/com/example/SomeClass.class")
+     * @param errorMessage  Human-readable error message if missing (include download URL)
+     */
+    public record Check(String resourcePath, String errorMessage) {}
+
+    /**
+     * Verify all checks pass. Throws RuntimeException on first failure.
+     * @param anchor  Class whose classloader to use for resource lookups
+     * @param checks  Dependency checks to run
+     */
+    public static void verify(Class<?> anchor, List<Check> checks) {
+        for (Check check : checks) {
+            if (anchor.getResource(check.resourcePath()) == null) {
+                throw new RuntimeException(check.errorMessage());
+            }
+        }
+    }
+
+    private DependencyVerifier() {}
+}

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/loading/EarlyRedirectorCore.java

@@ -0,0 +1,54 @@
+package com.gtnewhorizons.angelica.glsm.loading;
+
+import com.gtnewhorizons.angelica.glsm.redirect.GLSMRedirector;
+import org.objectweb.asm.ClassReader;
+import org.objectweb.asm.ClassWriter;
+import org.objectweb.asm.tree.ClassNode;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+public final class EarlyRedirectorCore {
+
+    private final GLSMRedirector core;
+    private final String[] targets;
+    private final String[] exclusions;
+
+    public EarlyRedirectorCore(String... extraExclusions) {
+        this.core = new GLSMRedirector();
+        this.targets = EcosystemNarrowRules.EARLY_REDIRECTOR_TARGETS.clone();
+
+        final List<String> excl = new ArrayList<>(Arrays.asList(core.getCoreExclusions()));
+        if (extraExclusions != null && extraExclusions.length > 0) {
+            Collections.addAll(excl, extraExclusions);
+        }
+        this.exclusions = excl.toArray(new String[0]);
+    }
+
+    public byte[] transform(String transformedName, byte[] basicClass) {
+        if (basicClass == null) return null;
+
+        if (!startsWithAny(transformedName, targets)) return basicClass;
+        if (startsWithAny(transformedName, exclusions)) return basicClass;
+        if (!core.shouldTransform(basicClass)) return basicClass;
+
+        final ClassReader cr = new ClassReader(basicClass);
+        final ClassNode cn = new ClassNode();
+        cr.accept(cn, 0);
+        if (core.transformClassNode(transformedName, cn)) {
+            final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
+            cn.accept(cw);
+            return cw.toByteArray();
+        }
+        return basicClass;
+    }
+
+    private static boolean startsWithAny(String name, String[] prefixes) {
+        for (String p : prefixes) {
+            if (name.startsWith(p)) return true;
+        }
+        return false;
+    }
+}

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/loading/EcosystemNarrowRules.java

@@ -0,0 +1,78 @@
+package com.gtnewhorizons.angelica.glsm.loading;
+
+import com.gtnewhorizons.angelica.glsm.loading.TransformerNarrower.NarrowRule;
+
+import java.util.List;
+
+public final class EcosystemNarrowRules {
+
+    public static final List<NarrowRule> ALL = List.of(
+        new NarrowRule("DragonAPI", "Reika.DragonAPI.ASM", List.of(
+            "Reika.DragonAPI.ASM.Patchers",
+            "Reika.DragonAPI.ASM.Profiling",
+            "Reika.DragonAPI.ASM.APIStripper",
+            "Reika.DragonAPI.ASM.ClassReparenter",
+            "Reika.DragonAPI.ASM.DependentMethodStripper",
+            "Reika.DragonAPI.ASM.DragonAPIClassTransformer",
+            "Reika.DragonAPI.ASM.FMLItemBlockPatch",
+            "Reika.DragonAPI.ASM.FluidNamePatch",
+            "Reika.DragonAPI.ASM.InterfaceInjector",
+            "Reika.DragonAPI.ASM.SpecialBiomePlacement",
+            "Reika.DragonAPI.ASM.StructureLootHooks"
+        )),
+
+        new NarrowRule("Xaeros_common", "xaero.common.core", List.of(
+            "xaero.common.core.transformer"
+        )),
+
+        new NarrowRule("Xaeros_map", "xaero.map.core", List.of(
+            "xaero.map.core.transformer"
+        )),
+
+        new NarrowRule("AdvancedLightsabers", "com.fiskmods.lightsabers.asm", List.of(
+            "com.fiskmods.lightsabers.asm.ALLoadingPlugin",
+            "com.fiskmods.lightsabers.asm.ASMHooks",
+            "com.fiskmods.lightsabers.asm.transformers"
+        )),
+
+        new NarrowRule("Ears", "com.unascribed.ears", List.of(
+            "com.unascribed.ears.asm",
+            "com.unascribed.ears.common.agent"
+        )),
+
+        new NarrowRule("Alfheim", "alfheim.common.core.asm.hook", List.of(
+            "alfheim.common.core.asm.hook.AlfheimFieldHookHandler",
+            "alfheim.common.core.asm.hook.AlfheimHPHooks",
+            "alfheim.common.core.asm.hook.Botania18AndUpBackport",
+            "alfheim.common.core.asm.hook.ElementalDamageAdapter",
+            "alfheim.common.core.asm.hook.integration",
+            "alfheim.common.core.asm.hook.extender.FurnaceExtender",
+            "alfheim.common.core.asm.hook.extender.ItemAuraRingExtender",
+            "alfheim.common.core.asm.hook.extender.ItemLensExtender",
+            "alfheim.common.core.asm.hook.extender.ItemTwigWandExtender",
+            "alfheim.common.core.asm.hook.extender.LightRelayExtender",
+            "alfheim.common.core.asm.hook.extender.PureDaisyExtender",
+            "alfheim.common.core.asm.hook.extender.QuartzExtender",
+            "alfheim.common.core.asm.hook.extender.RelicHooks",
+            "alfheim.common.core.asm.hook.extender.SparkExtender",
+            "alfheim.common.core.asm.hook.fixes.BotaniaGlowingRenderFixes",
+            "alfheim.common.core.asm.hook.fixes.CorporeaInputFix",
+            "alfheim.common.core.asm.hook.fixes.GodAttributesHooks",
+            "alfheim.common.core.asm.hook.fixes.RecipeAncientWillsFix"
+        ))
+    );
+
+    public static final String[] LWJGL3IFY_EXCLUSIONS_SHARED = {
+        "org.embeddedt.embeddium",
+        "org.taumc.celeritas",
+        "com.mitchej123.lwjgl.lwjgl3",
+        "com.mitchej123.glsm",
+        "com.gtnewhorizons.angelica.lwjgl3",
+    };
+
+    public static final String[] EARLY_REDIRECTOR_TARGETS = {
+        "cn.tesseract.mycelium.",
+    };
+
+    private EcosystemNarrowRules() {}
+}

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/loading/TransformerNarrower.java

@@ -0,0 +1,66 @@
+package com.gtnewhorizons.angelica.glsm.loading;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * Narrows overly-broad transformer exclusions that prevent the GLSM redirector from
+ * transforming GL calls in mod code. Some coremods register exclusions covering their
+ * entire package tree, which inadvertently shields rendering code from redirection.
+ * <p>
+ * This utility removes the broad exclusion and re-adds narrower ones that cover only
+ * the coremod's own transformer/ASM classes, leaving rendering code exposed.
+ * <p>
+ * Operates on a {@code Set<String>} (the transformer exceptions set from LaunchClassLoader)
+ * and a {@code Map<String, Object>} (the Launch blackboard). Callers extract these from
+ * the Forge/launchwrapper infrastructure.
+ */
+public final class TransformerNarrower {
+
+    private static final Logger LOGGER = LogManager.getLogger("GLSM");
+
+    /**
+     * A rule that replaces a broad transformer exclusion with narrower ones.
+     * @param name       Human-readable name for logging (e.g. "DragonAPI")
+     * @param broad      The broad exclusion to remove (e.g. "Reika.DragonAPI.ASM")
+     * @param narrow     Narrower exclusions to add in its place
+     */
+    public record NarrowRule(String name, String broad, List<String> narrow) {}
+
+    /**
+     * Apply narrowing rules to the transformer exceptions set.
+     *
+     * @param exceptions  The mutable Set from LaunchClassLoader.transformerExceptions
+     * @param blackboard  The Launch.blackboard map (checked for disable flags)
+     * @param keyPrefix   Blackboard key prefix for per-rule opt-out (e.g. "angelica" or "umbra").
+     *                    Rule "DragonAPI" checks key "{prefix}.narrow.DragonAPI". If explicitly
+     *                    set to Boolean.FALSE, the rule is skipped.
+     * @param callerName  Name for log messages (e.g. "Angelica" or "Umbra")
+     * @param rules       The narrowing rules to apply
+     * @return number of rules that were applied
+     */
+    public static int narrow(Set<String> exceptions, Map<String, Object> blackboard,
+                             String keyPrefix, String callerName, List<NarrowRule> rules) {
+        int applied = 0;
+        for (NarrowRule rule : rules) {
+            final String key = keyPrefix + ".narrow." + rule.name();
+            if (Boolean.FALSE.equals(blackboard.get(key))) {
+                continue;
+            }
+            if (exceptions.remove(rule.broad())) {
+                for (String narrow : rule.narrow()) {
+                    exceptions.add(narrow);
+                }
+                LOGGER.info("[{}] Narrowed {} transformer exclusion to allow GL redirection", callerName, rule.broad());
+                applied++;
+            }
+        }
+        return applied;
+    }
+
+    private TransformerNarrower() {}
+}

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/recording/AttribSnapshot.java

@@ -0,0 +1,178 @@
+package com.gtnewhorizons.angelica.glsm.recording;
+
+import com.gtnewhorizon.gtnhlib.bytebuf.MemoryUtilities;
+import com.gtnewhorizons.angelica.glsm.GLStateManager;
+import com.gtnewhorizons.angelica.glsm.states.VertexAttribState;
+import it.unimi.dsi.fastutil.ints.Int2LongOpenHashMap;
+import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
+import org.lwjgl.opengl.GL15;
+
+import java.nio.ByteBuffer;
+import java.util.ArrayList;
+import java.util.List;
+
+public final class AttribSnapshot {
+
+    public record AttribDesc(int location, int size, int type, boolean normalized, int stride, long offset, int sourceVboId, ByteBuffer readBuffer, long readBufferBaseOffset) {
+        public int effectiveStride() {
+            return stride != 0 ? stride : size * VertexAttribState.Attrib.glTypeSizeBytes(type);
+        }
+
+        public int typeSizeBytes() {
+            return VertexAttribState.Attrib.glTypeSizeBytes(type);
+        }
+    }
+
+    private final AttribDesc[] perLocation;
+    private final List<ByteBuffer> allocatedBuffers;
+    private boolean freed;
+
+    private AttribSnapshot(AttribDesc[] perLocation, List<ByteBuffer> allocatedBuffers) {
+        this.perLocation = perLocation;
+        this.allocatedBuffers = allocatedBuffers;
+    }
+
+    public AttribDesc get(int location) {
+        return (location >= 0 && location < perLocation.length) ? perLocation[location] : null;
+    }
+
+    public int maxLocations() {
+        return perLocation.length;
+    }
+
+    public void free() {
+        if (freed) return;
+        freed = true;
+        for (ByteBuffer buf : allocatedBuffers) {
+            MemoryUtilities.memFree(buf);
+        }
+        allocatedBuffers.clear();
+    }
+
+    /**
+     * Snapshot attribs over a tight vertex window {@code [firstVertex, firstVertex+vertexCount)}.
+     *
+     * <p>Hot path (single VBO backing every enabled attrib — the typical draw) runs without
+     * allocating any hashmaps. A second distinct VBO promotes to the map-backed fallback.
+     */
+    public static AttribSnapshot snapshot(int firstVertex, int vertexCount) {
+        final AttribDesc[] out = new AttribDesc[VertexAttribState.MAX_ATTRIBS];
+        final List<ByteBuffer> allocated = new ArrayList<>();
+        final int prevVBO = GLStateManager.getBoundVBO();
+
+        // Pass 1 — unioned [start,end] per vboId. Hot path: one source VBO, zero allocations.
+        int rangeSoleVboId = 0;
+        long rangeSoleStart = Long.MAX_VALUE;
+        long rangeSoleEnd = Long.MIN_VALUE;
+        Int2ObjectOpenHashMap<long[]> vboRanges = null;
+
+        final long lastVtx = (long) firstVertex + vertexCount - 1;
+        for (int i = 0; i < VertexAttribState.MAX_ATTRIBS; i++) {
+            final VertexAttribState.Attrib a = VertexAttribState.get(i);
+            if (!a.enabled || a.vboId == 0) continue;
+            final int stride = a.effectiveStride();
+            final long typeBytes = (long) a.size * VertexAttribState.Attrib.glTypeSizeBytes(a.type);
+            final long start = a.offset + (long) firstVertex * stride;
+            final long end = a.offset + lastVtx * stride + typeBytes;
+
+            if (vboRanges != null) {
+                long[] r = vboRanges.get(a.vboId);
+                if (r == null) {
+                    vboRanges.put(a.vboId, new long[] { start, end });
+                } else {
+                    if (start < r[0]) r[0] = start;
+                    if (end > r[1]) r[1] = end;
+                }
+            } else if (rangeSoleVboId == 0 || rangeSoleVboId == a.vboId) {
+                rangeSoleVboId = a.vboId;
+                if (start < rangeSoleStart) rangeSoleStart = start;
+                if (end > rangeSoleEnd) rangeSoleEnd = end;
+            } else {
+                // Spill: second distinct vboId. Promote the accumulated range to the map.
+                vboRanges = new Int2ObjectOpenHashMap<>();
+                vboRanges.put(rangeSoleVboId, new long[] { rangeSoleStart, rangeSoleEnd });
+                vboRanges.put(a.vboId, new long[] { start, end });
+            }
+        }
+
+        // Pass 2 — readback cache. Same spill pattern.
+        int readSoleVboId = 0;
+        ByteBuffer readSoleBuf = null;
+        long readSoleOffset = 0;
+        Int2ObjectOpenHashMap<ByteBuffer> vboBuffers = null;
+        Int2LongOpenHashMap vboReadOffsets = null;
+
+        try {
+            for (int i = 0; i < VertexAttribState.MAX_ATTRIBS; i++) {
+                final VertexAttribState.Attrib a = VertexAttribState.get(i);
+                if (!a.enabled) continue;
+
+                if (a.vboId != 0) {
+                    ByteBuffer buf;
+                    long readOffset;
+                    if (vboBuffers != null) {
+                        buf = vboBuffers.get(a.vboId);
+                        readOffset = buf != null ? vboReadOffsets.get(a.vboId) : 0;
+                    } else if (readSoleVboId == a.vboId) {
+                        buf = readSoleBuf;
+                        readOffset = readSoleOffset;
+                    } else {
+                        buf = null;
+                        readOffset = 0;
+                    }
+
+                    if (buf == null) {
+                        GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, a.vboId);
+                        final int bufferSize = GLStateManager.glGetBufferParameteri(GL15.GL_ARRAY_BUFFER, GL15.GL_BUFFER_SIZE);
+                        if (bufferSize <= 0) {
+                            GLStateManager.LOGGER.warn("[VBO Readback] GL_BUFFER_SIZE={} for VBO {}", bufferSize, a.vboId);
+                            continue;
+                        }
+
+                        final long rStart;
+                        final long rEnd;
+                        if (vboRanges != null) {
+                            final long[] range = vboRanges.get(a.vboId);
+                            rStart = range[0];
+                            rEnd = range[1];
+                        } else {
+                            rStart = rangeSoleStart;
+                            rEnd = rangeSoleEnd;
+                        }
+                        final long ro = Math.max(0, rStart);
+                        final int rs = (int) (Math.min(bufferSize, rEnd) - ro);
+                        if (rs <= 0) continue;
+
+                        buf = MemoryUtilities.memAlloc(rs);
+                        GLStateManager.glGetBufferSubData(GL15.GL_ARRAY_BUFFER, ro, buf);
+                        allocated.add(buf);
+                        readOffset = ro;
+
+                        if (vboBuffers != null) {
+                            vboBuffers.put(a.vboId, buf);
+                            vboReadOffsets.put(a.vboId, ro);
+                        } else if (readSoleVboId == 0) {
+                            readSoleVboId = a.vboId;
+                            readSoleBuf = buf;
+                            readSoleOffset = ro;
+                        } else {
+                            vboBuffers = new Int2ObjectOpenHashMap<>();
+                            vboReadOffsets = new Int2LongOpenHashMap();
+                            vboBuffers.put(readSoleVboId, readSoleBuf);
+                            vboReadOffsets.put(readSoleVboId, readSoleOffset);
+                            vboBuffers.put(a.vboId, buf);
+                            vboReadOffsets.put(a.vboId, ro);
+                        }
+                    }
+                    out[i] = new AttribDesc(i, a.size, a.type, a.normalized, a.stride, a.offset, a.vboId, buf, readOffset);
+                } else if (a.clientPointer != null) {
+                    out[i] = new AttribDesc(i, a.size, a.type, a.normalized, a.stride, a.clientPointer.position(), 0, a.clientPointer, 0L);
+                }
+            }
+        } finally {
+            GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, prevVBO);
+        }
+
+        return new AttribSnapshot(out, allocated);
+    }
+}

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/recording/CommandBuffer.java

@@ -600,23 +600,6 @@ public final class CommandBuffer {
         writeInt(listId);
     }
 
-    public void writeDrawArrays(int mode, int start, int count) {
-        ensureCapacity(16);
-        writeInt(GLCommand.DRAW_ARRAYS);
-        writeInt(mode);
-        writeInt(start);
-        writeInt(count);
-    }
-
-    public void writeDrawElements(int mode, int indices_count, int type, long indices_buffer_offset) {
-        ensureCapacity(24);
-        writeInt(GLCommand.DRAW_ELEMENTS);
-        writeInt(mode);
-        writeInt(indices_count);
-        writeInt(type);
-        writeLong(indices_buffer_offset);
-    }
-
     public void writeBindVBO(int vbo) {
         ensureCapacity(8);
         writeInt(GLCommand.BIND_VBO);

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/recording/CommandBufferExecutor.java

@@ -530,14 +530,6 @@ public final class CommandBufferExecutor {
                     ptr += 4 * MAX_DRAW_BUFFERS;
                     GLStateManager.glDrawBuffers(DRAW_BUFFERS_BUFFER);
                 }
-                case GLCommand.DRAW_ARRAYS -> {
-                    GLStateManager.glDrawArrays(memGetInt(ptr), memGetInt(ptr + 4), memGetInt(ptr + 8));
-                    ptr += 12;
-                }
-                case GLCommand.DRAW_ELEMENTS -> {
-                    GLStateManager.glDrawElements(memGetInt(ptr), memGetInt(ptr + 4), memGetInt(ptr + 8), memGetLong(ptr + 12));
-                    ptr += 20;
-                }
                 case GLCommand.BIND_VBO -> {
                     GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, memGetInt(ptr));
                     ptr += 4;

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/recording/CommandBufferProcessor.java

@@ -150,8 +150,6 @@ public final class CommandBufferProcessor {
             // Draw/call commands
             case GLCommand.DRAW_RANGE -> out.writeDrawRange(raw.readInt());
             case GLCommand.CALL_LIST -> out.writeCallList(raw.readInt());
-            case GLCommand.DRAW_ARRAYS -> out.writeDrawArrays(raw.readInt(), raw.readInt(), raw.readInt());
-            case GLCommand.DRAW_ELEMENTS -> out.writeDrawElements(raw.readInt(), raw.readInt(), raw.readInt(), raw.readLong());
             case GLCommand.BIND_VBO -> out.writeBindVBO(raw.readInt());
             case GLCommand.BIND_VAO -> out.writeBindVAO(raw.readInt());
 

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/recording/CommandRecorder.java

@@ -1,6 +1,8 @@
 package com.gtnewhorizons.angelica.glsm.recording;
 
 import com.gtnewhorizons.angelica.glsm.recording.commands.DisplayListCommand;
+import com.gtnewhorizons.angelica.glsm.recording.commands.IndexedDrawBatchBuilder;
+import com.gtnewhorizons.angelica.glsm.recording.commands.IndexedDrawCapture;
 import org.joml.Matrix4f;
 
 import java.nio.FloatBuffer;
@@ -11,6 +13,7 @@ import java.nio.IntBuffer;
  */
 public final class CommandRecorder {
     private final CommandBuffer buffer;
+    private final IndexedDrawBatchBuilder indexedDraws = new IndexedDrawBatchBuilder();
     private int commandCount;
 
     public CommandRecorder() {
@@ -26,7 +29,19 @@ public final class CommandRecorder {
         return commandCount;
     }
 
+    public IndexedDrawBatchBuilder getIndexedDraws() {
+        return indexedDraws;
+    }
+
+    public void recordIndexedDrawCapture(IndexedDrawCapture capture) {
+        indexedDraws.add(capture);
+        recordComplexCommand(capture.placeholder);
+    }
+
     public void free() {
+        for (IndexedDrawCapture c : indexedDraws.getCaptures()) {
+            c.freeBuffers();
+        }
         buffer.free();
     }
 
@@ -347,16 +362,6 @@ public final class CommandRecorder {
         commandCount++;
     }
 
-    public void recordDrawArrays(int mode, int start, int count) {
-        buffer.writeDrawArrays(mode, start, count);
-        commandCount++;
-    }
-
-    public void recordDrawElements(int mode, int indices_count, int type, long indices_buffer_offset) {
-        buffer.writeDrawElements(mode, indices_count, type, indices_buffer_offset);
-        commandCount++;
-    }
-
     public void recordBindVBO(int vbo) {
         buffer.writeBindVBO(vbo);
         commandCount++;

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/recording/CompiledDisplayList.java

@@ -2,12 +2,15 @@ package com.gtnewhorizons.angelica.glsm.recording;
 
 import com.gtnewhorizons.angelica.glsm.DisplayListManager;
 import com.gtnewhorizons.angelica.glsm.recording.commands.DisplayListCommand;
+import com.gtnewhorizons.angelica.glsm.recording.commands.IndexedDrawBatch;
 import it.unimi.dsi.fastutil.ints.Int2IntMap;
 import it.unimi.dsi.fastutil.ints.Int2IntOpenHashMap;
 import it.unimi.dsi.fastutil.ints.IntArrayList;
 import it.unimi.dsi.fastutil.ints.IntList;
 
 import java.nio.ByteBuffer;
+import java.util.Collections;
+import java.util.List;
 
 import static com.gtnewhorizon.gtnhlib.bytebuf.MemoryUtilities.memAddress;
 import static com.gtnewhorizon.gtnhlib.bytebuf.MemoryUtilities.memFree;
@@ -26,16 +29,18 @@ public final class CompiledDisplayList {
      * Empty display list singleton. Per OpenGL spec, an empty list is still valid.
      * This instance does nothing when rendered and is never deleted (shared singleton).
      */
-    public static final CompiledDisplayList EMPTY = new CompiledDisplayList(null, null, null);
+    public static final CompiledDisplayList EMPTY = new CompiledDisplayList(null, null, null, Collections.emptyList());
 
     private final ByteBuffer commandBuffer;     // Off-heap command storage, must be freed
     private final Object[] complexObjects;      // Complex commands (TexImage2D, etc.)
     private final DisplayListVBO ownedVbos;     // GPU resources referenced by index
+    private final List<IndexedDrawBatch> indexedBatches; // Shared VAO/VBO/EBO triples per layout group
 
-    public CompiledDisplayList(ByteBuffer commandBuffer, Object[] complexObjects, DisplayListVBO ownedVbos) {
+    public CompiledDisplayList(ByteBuffer commandBuffer, Object[] complexObjects, DisplayListVBO ownedVbos, List<IndexedDrawBatch> indexedBatches) {
         this.commandBuffer = commandBuffer;
         this.complexObjects = complexObjects;
         this.ownedVbos = ownedVbos;
+        this.indexedBatches = indexedBatches;
     }
 
     /**
@@ -51,7 +56,6 @@ public final class CompiledDisplayList {
      * Delete all resources held by this display list.
      */
     public void delete() {
-        // Delete complex objects that hold resources
         if (complexObjects != null) {
             for (Object obj : complexObjects) {
                 if (obj instanceof DisplayListCommand cmd) {
@@ -60,11 +64,18 @@ public final class CompiledDisplayList {
             }
         }
 
-        // Close VBOs
+        // Close VBOs from immediate-mode DisplayListVBOBuilder.
         if (ownedVbos != null) {
             ownedVbos.delete();
         }
 
+        // Release shared (VAO, VBO, EBO) triples from IndexedDrawBatchBuilder.
+        if (indexedBatches != null) {
+            for (IndexedDrawBatch batch : indexedBatches) {
+                batch.delete();
+            }
+        }
+
         // Free the command buffer (off-heap memory)
         if (commandBuffer != null) {
             memFree(commandBuffer);
@@ -89,6 +100,10 @@ public final class CompiledDisplayList {
         return ownedVbos;
     }
 
+    public List<IndexedDrawBatch> getIndexedBatches() {
+        return indexedBatches;
+    }
+
     // === Test inspection methods ===
 
     /**

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/recording/DisplayListVBOBuilder.java

@@ -75,6 +75,12 @@ public final class DisplayListVBOBuilder {
                 if (data.drawMode == GL11.GL_QUADS) {
                     final IVertexArrayObject indexedVAO = new IndexedVAO(vbo, IndexBuffer.convertQuadsToTrigs(start, start + vertexCount));
                     vbos[data.drawIndex] = new DisplayListVBO.SubVBO(indexedVAO, GL11.GL_TRIANGLES, 0, vertexCount / 4 * 6);
+                } else if (data.drawMode == GL11.GL_QUAD_STRIP) {
+                    // GL_QUAD_STRIP is removed in core profile; an even-length GL_TRIANGLE_STRIP produces the same quads
+                    vbos[data.drawIndex] = new DisplayListVBO.SubVBO(vao, GL11.GL_TRIANGLE_STRIP, start, vertexCount & ~1);
+                } else if (data.drawMode == GL11.GL_POLYGON) {
+                    // GL_POLYGON is removed in core profile; convert to GL_TRIANGLE_FAN which is equivalent for convex polygons
+                    vbos[data.drawIndex] = new DisplayListVBO.SubVBO(vao, GL11.GL_TRIANGLE_FAN, start, vertexCount);
                 } else {
                     vbos[data.drawIndex] = new DisplayListVBO.SubVBO(vao, data.drawMode, start, vertexCount);
                 }

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/recording/GLCommand.java

@@ -97,8 +97,6 @@ public final class GLCommand {
     public static final int CALL_LIST = 102;         // [cmd:4][listId:4] = 8 bytes
 
 
-    public static final int DRAW_ARRAYS = 110;       // [cmd:4][drawMode:4][start:4][count:4] = 20 bytes
-    public static final int DRAW_ELEMENTS = 111;     // [cmd:4][mode:4][indices_count:4][type:4][indices_buffer_offset:8] = 28 bytes
     public static final int DRAW_BUFFER = 112;       // [cmd:4][mode:4] = 8 bytes
     public static final int DRAW_BUFFERS = 113;      // [cmd:4][count:4][bufs:4*8] = 40 bytes (up to 8 buffers)
     /**
@@ -219,7 +217,7 @@ public final class GLCommand {
             // Three int commands (16 bytes)
             case GLCommand.STENCIL_FUNC, GLCommand.STENCIL_OP, GLCommand.TEX_PARAMETERI,
                  GLCommand.LIGHTF, GLCommand.LIGHTI,
-                 GLCommand.MATERIALF, GLCommand.TEX_PARAMETERF, GLCommand.DRAW_ARRAYS -> 16;
+                 GLCommand.MATERIALF, GLCommand.TEX_PARAMETERF -> 16;
 
             // Four int commands (20 bytes)
             case GLCommand.VIEWPORT, GLCommand.BLEND_FUNC, GLCommand.COLOR_MASK,
@@ -227,8 +225,6 @@ public final class GLCommand {
                  GLCommand.SCISSOR,
                  GLCommand.COLOR, GLCommand.CLEAR_COLOR, GLCommand.BLEND_COLOR -> 20;
 
-            case GLCommand.DRAW_ELEMENTS -> 24;
-
             // DRAW_RANGE_RESTORE: 28 bytes
             case GLCommand.DRAW_RANGE_RESTORE -> 28;
 

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/recording/ImmediateModeRecorder.java

@@ -5,15 +5,11 @@ import com.gtnewhorizon.gtnhlib.client.renderer.TessellatorManager;
 import com.gtnewhorizon.gtnhlib.client.renderer.vertex.VertexFormatElement.Usage;
 import com.gtnewhorizons.angelica.glsm.GLStateManager;
 import com.gtnewhorizons.angelica.glsm.states.VertexAttribState;
-import com.gtnewhorizon.gtnhlib.bytebuf.MemoryUtilities;
 import org.lwjgl.opengl.GL11;
-import org.lwjgl.opengl.GL15;
 
 import java.nio.ByteBuffer;
 import java.util.Arrays;
 
-import static com.gtnewhorizons.angelica.glsm.backend.BackendManager.RENDER_BACKEND;
-
 /**
  * Records immediate mode GL calls (glBegin/glEnd/glVertex) via {@link DirectTessellator}.
  * Used both during display list compilation and for live immediate mode emulation in core profile.
@@ -167,19 +163,14 @@ public final class ImmediateModeRecorder {
         .mapToInt(Usage::getAttributeLocation)
             .max().orElse(0);
 
-    private static final ByteBuffer[] scratchAttribBuffers = new ByteBuffer[NUM_ATTRIBS];
-    private static final long[] scratchAttribBaseOffsets = new long[NUM_ATTRIBS];
-    private static final int[] scratchVBOIds = new int[NUM_ATTRIBS];
-    private static final ByteBuffer[] scratchVBOBuffers = new ByteBuffer[NUM_ATTRIBS];
-    private static final long[] scratchVBOReadOffsets = new long[NUM_ATTRIBS];
-
     private static final class AttribReader {
         ByteBuffer data;
         int stride;
         int baseOffset;
         int size;
         int loc;
-        VertexAttribState.Attrib attrib;
+        int type;
+        boolean normalized;
     }
 
     private static final AttribReader[] readers = new AttribReader[NUM_ATTRIBS];
@@ -198,167 +189,32 @@ public final class ImmediateModeRecorder {
      * Reads vertex data from VBOs or client memory referenced by VertexAttribState and converts to immediate mode geometry.
      */
     public static DirectTessellator processDrawArraysFromAttribs(int mode, int first, int count) {
-        final int readVBOCount = readbackAttribVBOs(first, count);
-
+        final AttribSnapshot snap = AttribSnapshot.snapshot(first, count);
         try {
-            prepareReaders();
+            prepareReaders(snap);
             if (positionReaderIndex < 0) return null;
             return readVerticesFromBuffer(mode, first, count);
         } finally {
-            freeReadbackBuffers(readVBOCount);
+            snap.free();
         }
     }
 
-    /**
-     * Process a glDrawElements call during display list recording when a VBO is bound.
-     */
-    public static DirectTessellator processDrawElementsFromVBO(int mode, int indicesCount, int indexType, long indicesOffset, int eboId) {
-        if (eboId == 0) return null;
-
-        final int readVBOCount = readbackAttribVBOs(-1, 0);
-
-        try {
-            prepareReaders();
-            if (positionReaderIndex < 0) return null;
-
-            final int prevEBO = GLStateManager.getBoundEBO();
-            GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, eboId);
-            final int eboSize = RENDER_BACKEND.getBufferParameteri(GL15.GL_ELEMENT_ARRAY_BUFFER, GL15.GL_BUFFER_SIZE);
-            if (eboSize <= 0) {
-                GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, prevEBO);
-                return null;
-            }
-
-            final int indexSize = VertexAttribState.Attrib.glTypeSizeBytes(indexType);
-            final int eboReadOffset = (int) indicesOffset;
-            final int eboReadSize = indicesCount * indexSize;
-            if (eboReadOffset + eboReadSize > eboSize) {
-                GLStateManager.LOGGER.warn("[EBO] Read range {}+{} exceeds buffer size {}", eboReadOffset, eboReadSize, eboSize);
-                GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, prevEBO);
-                return null;
-            }
-            final ByteBuffer eboData = MemoryUtilities.memAlloc(eboReadSize);
-            RENDER_BACKEND.getBufferSubData(GL15.GL_ELEMENT_ARRAY_BUFFER, eboReadOffset, eboData);
-            GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, prevEBO);
-
-            try {
-                return readVerticesFromBufferIndexed(mode, eboData, indexType, 0, indicesCount);
-            } finally {
-                MemoryUtilities.memFree(eboData);
-            }
-        } finally {
-            freeReadbackBuffers(readVBOCount);
-        }
-    }
-
-    /**
-     * Read data for all enabled attribs into scratchAttribBuffers.
-     * For VBO-backed attribs, reads VBO data. For client-memory attribs, uses the client pointer directly.
-     */
-    private static int readbackAttribVBOs(int firstVertex, int vertexCount) {
-        int readVBOCount = 0;
-        final int prevVBO = GLStateManager.getBoundVBO();
-        final boolean partialRead = firstVertex >= 0;
-
-        for (int i = 0; i < NUM_ATTRIBS; i++) {
-            scratchAttribBuffers[i] = null;
-            scratchAttribBaseOffsets[i] = 0;
-            final VertexAttribState.Attrib a = VertexAttribState.get(i);
-            if (!a.enabled) continue;
-
-            if (a.vboId != 0) {
-                // VBO-backed attrib — read from GPU
-                ByteBuffer existing = null;
-                int existingIdx = -1;
-                for (int j = 0; j < readVBOCount; j++) {
-                    if (scratchVBOIds[j] == a.vboId) {
-                        existing = scratchVBOBuffers[j];
-                        existingIdx = j;
-                        break;
-                    }
-                }
-
-                if (existing != null) {
-                    scratchAttribBuffers[i] = existing;
-                    scratchAttribBaseOffsets[i] = scratchVBOReadOffsets[existingIdx];
-                } else {
-                    GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, a.vboId);
-                    final int bufferSize = RENDER_BACKEND.getBufferParameteri(GL15.GL_ARRAY_BUFFER, GL15.GL_BUFFER_SIZE);
-                    if (bufferSize <= 0) {
-                        GLStateManager.LOGGER.warn("[VBO Readback] GL_BUFFER_SIZE={} for VBO {}", bufferSize, a.vboId);
-                        continue;
-                    }
-
-                    final long readOffset;
-                    final int readSize;
-                    if (partialRead) {
-                        final int stride = a.effectiveStride();
-                        long rangeStart = a.offset + (long) firstVertex * stride;
-                        long rangeEnd = a.offset + (long) (firstVertex + vertexCount - 1) * stride + (long) a.size * a.typeSizeBytes();
-
-                        for (int k = 0; k < NUM_ATTRIBS; k++) {
-                            if (k == i) continue;
-                            final VertexAttribState.Attrib ak = VertexAttribState.get(k);
-                            if (!ak.enabled || ak.vboId != a.vboId) continue;
-                            final int ks = ak.effectiveStride();
-                            rangeStart = Math.min(rangeStart, ak.offset + (long) firstVertex * ks);
-                            rangeEnd = Math.max(rangeEnd, ak.offset + (long) (firstVertex + vertexCount - 1) * ks
-                                + (long) ak.size * ak.typeSizeBytes());
-                        }
-                        rangeStart = Math.max(0, rangeStart);
-                        rangeEnd = Math.min(bufferSize, rangeEnd);
-                        readOffset = rangeStart;
-                        readSize = (int) (rangeEnd - rangeStart);
-                    } else {
-                        readOffset = 0;
-                        readSize = bufferSize;
-                    }
-
-                    if (readSize <= 0) continue;
-
-                    final ByteBuffer buf = MemoryUtilities.memAlloc(readSize);
-                    RENDER_BACKEND.getBufferSubData(GL15.GL_ARRAY_BUFFER, readOffset, buf);
-                    scratchAttribBuffers[i] = buf;
-                    scratchAttribBaseOffsets[i] = readOffset;
-                    scratchVBOIds[readVBOCount] = a.vboId;
-                    scratchVBOReadOffsets[readVBOCount] = readOffset;
-                    scratchVBOBuffers[readVBOCount] = buf;
-                    readVBOCount++;
-                }
-            } else if (a.clientPointer != null) {
-                // Client-memory attrib — use pointer directly (no allocation needed)
-                scratchAttribBuffers[i] = a.clientPointer;
-            }
-        }
-
-        GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, prevVBO);
-
-        return readVBOCount;
-    }
-
-    private static void freeReadbackBuffers(int readVBOCount) {
-        for (int i = 0; i < readVBOCount; i++) {
-            MemoryUtilities.memFree(scratchVBOBuffers[i]);
-            scratchVBOBuffers[i] = null;
-        }
-    }
-
-    private static void prepareReaders() {
+    private static void prepareReaders(AttribSnapshot snap) {
         nonPositionCount = 0;
         positionReaderIndex = -1;
 
         for (int i = 0; i < NUM_ATTRIBS; i++) {
-            final ByteBuffer buf = scratchAttribBuffers[i];
-            if (buf == null) continue;
-            final VertexAttribState.Attrib a = VertexAttribState.get(i);
+            final AttribSnapshot.AttribDesc d = snap.get(i);
+            if (d == null) continue;
 
             final AttribReader r = readers[i];
-            r.data = buf;
-            r.stride = a.effectiveStride();
-            r.baseOffset = (int) (a.offset - scratchAttribBaseOffsets[i]);
-            r.size = a.size;
+            r.data = d.readBuffer();
+            r.stride = d.effectiveStride();
+            r.baseOffset = (int) (d.offset() - d.readBufferBaseOffset());
+            r.size = d.size();
             r.loc = i;
-            r.attrib = a;
+            r.type = d.type();
+            r.normalized = d.normalized();
 
             if (i == LOC_POSITION) {
                 positionReaderIndex = i;
@@ -379,18 +235,6 @@ public final class ImmediateModeRecorder {
         return end();
     }
 
-    private static DirectTessellator readVerticesFromBufferIndexed(int mode, ByteBuffer eboData, int indexType, int eboOffset, int indicesCount) {
-        begin(mode);
-        final DirectTessellator t = tessellator();
-
-        for (int i = 0; i < indicesCount; i++) {
-            final int index = readIndex(eboData, indexType, eboOffset, i);
-            readVertexFromBuffer(t, index);
-        }
-
-        return end();
-    }
-
     public static int readIndex(ByteBuffer ebo, int indexType, int eboOffset, int i) {
         return switch (indexType) {
             case GL11.GL_UNSIGNED_BYTE -> ebo.get(eboOffset + i) & 0xFF;
@@ -411,39 +255,43 @@ public final class ImmediateModeRecorder {
             final AttribReader r = readers[positionReaderIndex];
             final int base = r.baseOffset + vertexIndex * r.stride;
             t.addVertex(
-                r.attrib.readComponent(r.data, base, 0),
-                r.attrib.readComponent(r.data, base, 1),
-                (r.size >= 3) ? r.attrib.readComponent(r.data, base, 2) : 0.0f);
+                readComponent(r, base, 0),
+                readComponent(r, base, 1),
+                (r.size >= 3) ? readComponent(r, base, 2) : 0.0f);
         }
     }
 
     private static void emitAttrib(DirectTessellator t, AttribReader r, int base) {
         if (r.loc == LOC_NORMAL) {
             t.setNormal(
-                r.attrib.readComponent(r.data, base, 0),
-                r.attrib.readComponent(r.data, base, 1),
-                r.attrib.readComponent(r.data, base, 2));
+                readComponent(r, base, 0),
+                readComponent(r, base, 1),
+                readComponent(r, base, 2));
         } else if (r.loc == LOC_UV0) {
             t.setTextureUV(
-                r.attrib.readComponent(r.data, base, 0),
-                (r.size >= 2) ? r.attrib.readComponent(r.data, base, 1) : 0.0f);
+                readComponent(r, base, 0),
+                (r.size >= 2) ? readComponent(r, base, 1) : 0.0f);
         } else if (r.loc == LOC_UV1) {
-            if (r.attrib.type == GL11.GL_SHORT) {
+            if (r.type == GL11.GL_SHORT) {
                 final int s = r.data.getShort(base) & 0xFFFF;
                 final int u = (r.size >= 2) ? (r.data.getShort(base + 2) & 0xFFFF) : 0;
                 t.setBrightness((u << 16) | s);
-            } else if (r.attrib.type == GL11.GL_FLOAT) {
+            } else if (r.type == GL11.GL_FLOAT) {
                 final int s = (int) r.data.getFloat(base);
                 final int u = (r.size >= 2) ? (int) r.data.getFloat(base + 4) : 0;
                 t.setBrightness((u << 16) | (s & 0xFFFF));
             }
         } else if (r.loc == LOC_COLOR) {
-            final float cr = r.attrib.readComponent(r.data, base, 0);
-            final float cg = r.attrib.readComponent(r.data, base, 1);
-            final float cb = r.attrib.readComponent(r.data, base, 2);
-            final float ca = (r.size >= 4) ? r.attrib.readComponent(r.data, base, 3) : 1.0f;
+            final float cr = readComponent(r, base, 0);
+            final float cg = readComponent(r, base, 1);
+            final float cb = readComponent(r, base, 2);
+            final float ca = (r.size >= 4) ? readComponent(r, base, 3) : 1.0f;
             t.setColorRGBA((int) (cr * 255.0f), (int) (cg * 255.0f), (int) (cb * 255.0f), (int) (ca * 255.0f));
         }
     }
 
+    private static float readComponent(AttribReader r, int base, int component) {
+        return VertexAttribState.Attrib.readComponent(r.type, r.normalized, r.data, base, component);
+    }
+
 }

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/recording/commands/AttribLayoutKey.java

@@ -0,0 +1,64 @@
+package com.gtnewhorizons.angelica.glsm.recording.commands;
+
+import com.gtnewhorizons.angelica.glsm.states.VertexAttribState;
+
+import java.util.Arrays;
+
+public final class AttribLayoutKey {
+    final int[] locations;
+    final int[] sizes;
+    final int[] types;
+    final boolean[] normalized;
+    private final int[] offsets;
+    private final int stride;
+    private final int hash;
+
+    public AttribLayoutKey(int[] locations, int[] sizes, int[] types, boolean[] normalized) {
+        this.locations = locations;
+        this.sizes = sizes;
+        this.types = types;
+        this.normalized = normalized;
+
+        final int n = locations.length;
+        final int[] off = new int[n];
+        int base = 0;
+        int maxAlign = 1;
+        for (int i = 0; i < n; i++) {
+            final int typeSize = VertexAttribState.Attrib.glTypeSizeBytes(types[i]);
+            if (typeSize > maxAlign) maxAlign = typeSize;
+            base = (base + typeSize - 1) & -typeSize;
+            off[i] = base;
+            base += sizes[i] * typeSize;
+        }
+        this.offsets = off;
+        this.stride = (base + maxAlign - 1) & -maxAlign;
+
+        int h = Arrays.hashCode(locations);
+        h = 31 * h + Arrays.hashCode(sizes);
+        h = 31 * h + Arrays.hashCode(types);
+        h = 31 * h + Arrays.hashCode(normalized);
+        this.hash = h;
+    }
+
+    public int offset(int i) {
+        return offsets[i];
+    }
+
+    public int stride() {
+        return stride;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (!(o instanceof AttribLayoutKey k)) return false;
+        return Arrays.equals(locations, k.locations)
+            && Arrays.equals(sizes, k.sizes)
+            && Arrays.equals(types, k.types)
+            && Arrays.equals(normalized, k.normalized);
+    }
+
+    @Override
+    public int hashCode() {
+        return hash;
+    }
+}

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/recording/commands/BatchedIndexedDrawCmd.java

@@ -0,0 +1,37 @@
+package com.gtnewhorizons.angelica.glsm.recording.commands;
+
+import com.gtnewhorizons.angelica.glsm.GLStateManager;
+
+public final class BatchedIndexedDrawCmd implements DisplayListCommand {
+    private int sharedVAO;
+    private int drawMode;
+    private int indexCount;
+    private int indexType;
+    private long indexByteOffset;
+
+    public void fill(int sharedVAO, int drawMode, int indexCount, int indexType, long indexByteOffset) {
+        this.sharedVAO = sharedVAO;
+        this.drawMode = drawMode;
+        this.indexCount = indexCount;
+        this.indexType = indexType;
+        this.indexByteOffset = indexByteOffset;
+    }
+
+    public int getSharedVAO() { return sharedVAO; }
+    public int getDrawMode() { return drawMode; }
+    public int getIndexCount() { return indexCount; }
+    public int getIndexType() { return indexType; }
+    public long getIndexByteOffset() { return indexByteOffset; }
+
+    @Override
+    public void execute() {
+        if (sharedVAO == 0) return;
+        GLStateManager.glBindVertexArray(sharedVAO);
+        GLStateManager.glDrawElements(drawMode, indexCount, indexType, indexByteOffset);
+    }
+
+    @Override
+    public String toString() {
+        return "BatchedIndexedDrawCmd(vao=" + sharedVAO + ", mode=" + drawMode + ", count=" + indexCount + ", type=" + indexType + ", offset=" + indexByteOffset + ")";
+    }
+}

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/recording/commands/IndexedDrawBatch.java

@@ -0,0 +1,34 @@
+package com.gtnewhorizons.angelica.glsm.recording.commands;
+
+import com.gtnewhorizons.angelica.glsm.GLStateManager;
+
+public final class IndexedDrawBatch {
+    private int sharedVAO;
+    private int sharedVBO;
+    private int sharedEBO;
+    private boolean deleted;
+
+    public IndexedDrawBatch(int sharedVAO, int sharedVBO, int sharedEBO) {
+        this.sharedVAO = sharedVAO;
+        this.sharedVBO = sharedVBO;
+        this.sharedEBO = sharedEBO;
+    }
+
+    public int getSharedVAO() { return sharedVAO; }
+    public int getSharedVBO() { return sharedVBO; }
+    public int getSharedEBO() { return sharedEBO; }
+
+    public void delete() {
+        if (deleted) return;
+        deleted = true;
+        if (sharedVAO != 0) GLStateManager.glDeleteVertexArrays(sharedVAO);
+        if (sharedVBO != 0) GLStateManager.glDeleteBuffers(sharedVBO);
+        if (sharedEBO != 0) GLStateManager.glDeleteBuffers(sharedEBO);
+        sharedVAO = sharedVBO = sharedEBO = 0;
+    }
+
+    @Override
+    public String toString() {
+        return "IndexedDrawBatch(vao=" + sharedVAO + ", vbo=" + sharedVBO + ", ebo=" + sharedEBO + ")";
+    }
+}

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/recording/commands/IndexedDrawBatchBuilder.java

@@ -0,0 +1,171 @@
+package com.gtnewhorizons.angelica.glsm.recording.commands;
+
+import com.gtnewhorizon.gtnhlib.bytebuf.MemoryUtilities;
+import com.gtnewhorizons.angelica.glsm.GLStateManager;
+import it.unimi.dsi.fastutil.objects.Object2ObjectLinkedOpenHashMap;
+import org.lwjgl.opengl.GL11;
+import org.lwjgl.opengl.GL15;
+
+import java.nio.ByteBuffer;
+import java.util.ArrayList;
+import java.util.List;
+
+import static com.gtnewhorizon.gtnhlib.bytebuf.MemoryUtilities.memAddress0;
+import static com.gtnewhorizon.gtnhlib.bytebuf.MemoryUtilities.memCopy;
+import static com.gtnewhorizon.gtnhlib.bytebuf.MemoryUtilities.memGetInt;
+import static com.gtnewhorizon.gtnhlib.bytebuf.MemoryUtilities.memPutInt;
+
+public final class IndexedDrawBatchBuilder {
+
+    private final List<IndexedDrawCapture> captures = new ArrayList<>();
+
+    public boolean isEmpty() {
+        return captures.isEmpty();
+    }
+
+    public void add(IndexedDrawCapture capture) {
+        captures.add(capture);
+    }
+
+    public List<IndexedDrawCapture> getCaptures() {
+        return captures;
+    }
+
+    public List<IndexedDrawBatch> build() {
+        final List<IndexedDrawBatch> out = new ArrayList<>();
+        if (captures.isEmpty()) return out;
+
+        final int prevVAO = GLStateManager.getBoundVAO();
+        final int prevVBO = GLStateManager.getBoundVBO();
+        final int prevEBO = GLStateManager.getBoundEBO();
+
+        final List<GroupResult> results = new ArrayList<>();
+        boolean success = false;
+        try {
+            final Object2ObjectLinkedOpenHashMap<AttribLayoutKey, List<IndexedDrawCapture>> groups = new Object2ObjectLinkedOpenHashMap<>();
+            for (IndexedDrawCapture c : captures) {
+                groups.computeIfAbsent(c.layoutKey, k -> new ArrayList<>()).add(c);
+            }
+
+            for (List<IndexedDrawCapture> group : groups.values()) {
+                results.add(buildGroup(group));
+            }
+            // Placeholder fill is deferred until every group's GL work has succeeded.
+            for (GroupResult r : results) r.commit();
+            for (GroupResult r : results) out.add(r.batch);
+            success = true;
+        } finally {
+            if (!success) {
+                for (GroupResult r : results) r.batch.delete();
+            }
+            GLStateManager.glBindVertexArray(prevVAO);
+            GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, prevEBO);
+            GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, prevVBO);
+        }
+
+        return out;
+    }
+
+    private record GroupResult(IndexedDrawBatch batch, List<IndexedDrawCapture> captures,
+                               int[] drawModes, int[] indexCounts, long[] indexOffsets) {
+        void commit() {
+            final int sharedVAO = batch.getSharedVAO();
+            for (int i = 0; i < captures.size(); i++) {
+                captures.get(i).placeholder.fill(sharedVAO, drawModes[i], indexCounts[i], GL11.GL_UNSIGNED_INT, indexOffsets[i]);
+            }
+        }
+    }
+
+    private static GroupResult buildGroup(List<IndexedDrawCapture> group) {
+        long totalVertexBytes = 0;
+        long totalIndexBytes = 0;
+        for (IndexedDrawCapture c : group) {
+            totalVertexBytes += (long) c.vertexCount * c.layoutKey.stride();
+            totalIndexBytes += (long) c.indexCount * 4;   // always GL_UNSIGNED_INT
+        }
+        if (totalVertexBytes > Integer.MAX_VALUE || totalIndexBytes > Integer.MAX_VALUE) {
+            throw new IllegalStateException("batch exceeds 2GiB — split needed");
+        }
+
+        int sharedVAO = 0;
+        int sharedVBO = 0;
+        int sharedEBO = 0;
+        ByteBuffer eboData = null;
+        boolean success = false;
+
+        final int n = group.size();
+        final int[] drawModes = new int[n];
+        final int[] indexCounts = new int[n];
+        final long[] indexOffsets = new long[n];
+
+        try {
+            sharedVAO = GLStateManager.glGenVertexArrays();
+            sharedVBO = GLStateManager.glGenBuffers();
+            sharedEBO = GLStateManager.glGenBuffers();
+            eboData = MemoryUtilities.memAlloc((int) totalIndexBytes);
+
+            GLStateManager.glBindVertexArray(sharedVAO);
+            GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, sharedVBO);
+            GLStateManager.glBufferData(GL15.GL_ARRAY_BUFFER, totalVertexBytes, GL15.GL_STATIC_DRAW);
+
+            int vboBytePos = 0;
+            int eboBytePos = 0;
+            int vertexBase = 0;
+            final long eboAddr = memAddress0(eboData);
+
+            for (int g = 0; g < n; g++) {
+                final IndexedDrawCapture c = group.get(g);
+                final int vBytes = c.vertexCount * c.layoutKey.stride();
+                GLStateManager.glBufferSubData(GL15.GL_ARRAY_BUFFER, vboBytePos, c.vertexData);
+
+                final long srcIdxAddr = memAddress0(c.indexData);
+                final int idxBytes = c.indexCount * 4;
+                if (vertexBase == 0) {
+                    // First capture (or a group that starts at 0) — indices are already
+                    // rebased to [0..vertexCount) in IndexedDrawCapture, so a raw bulk copy
+                    // is correct and strictly faster than the per-index loop.
+                    memCopy(srcIdxAddr, eboAddr + eboBytePos, idxBytes);
+                } else {
+                    final long dstBase = eboAddr + eboBytePos;
+                    for (int i = 0; i < c.indexCount; i++) {
+                        memPutInt(dstBase + i * 4L, memGetInt(srcIdxAddr + i * 4L) + vertexBase);
+                    }
+                }
+
+                drawModes[g] = c.drawMode;
+                indexCounts[g] = c.indexCount;
+                indexOffsets[g] = eboBytePos;
+
+                vboBytePos += vBytes;
+                eboBytePos += idxBytes;
+                vertexBase += c.vertexCount;
+            }
+
+            eboData.position(0).limit((int) totalIndexBytes);
+
+            GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, sharedEBO);
+            GLStateManager.glBufferData(GL15.GL_ELEMENT_ARRAY_BUFFER, eboData, GL15.GL_STATIC_DRAW);
+
+            final AttribLayoutKey layout = group.get(0).layoutKey;
+            final int stride = layout.stride();
+            for (int i = 0; i < layout.locations.length; i++) {
+                final int loc = layout.locations[i];
+                final int size = layout.sizes[i];
+                final int type = layout.types[i];
+                GLStateManager.glVertexAttribPointer(loc, size, type, layout.normalized[i], stride, layout.offset(i));
+                GLStateManager.glEnableVertexAttribArray(loc);
+            }
+
+            success = true;
+            return new GroupResult(new IndexedDrawBatch(sharedVAO, sharedVBO, sharedEBO),
+                group, drawModes, indexCounts, indexOffsets);
+        } finally {
+            if (eboData != null) MemoryUtilities.memFree(eboData);
+            if (!success) {
+                if (sharedVAO != 0) GLStateManager.glDeleteVertexArrays(sharedVAO);
+                if (sharedVBO != 0) GLStateManager.glDeleteBuffers(sharedVBO);
+                if (sharedEBO != 0) GLStateManager.glDeleteBuffers(sharedEBO);
+            }
+        }
+    }
+}

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/recording/commands/IndexedDrawCapture.java

@@ -0,0 +1,242 @@
+package com.gtnewhorizons.angelica.glsm.recording.commands;
+
+import com.gtnewhorizon.gtnhlib.bytebuf.MemoryUtilities;
+import com.gtnewhorizons.angelica.glsm.GLStateManager;
+import com.gtnewhorizons.angelica.glsm.QuadConverter;
+import com.gtnewhorizons.angelica.glsm.recording.AttribSnapshot;
+import com.gtnewhorizons.angelica.glsm.states.VertexAttribState;
+import org.lwjgl.opengl.GL11;
+import org.lwjgl.opengl.GL15;
+
+import java.nio.ByteBuffer;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.Set;
+
+import static com.gtnewhorizon.gtnhlib.bytebuf.MemoryUtilities.memGetInt;
+import static com.gtnewhorizon.gtnhlib.bytebuf.MemoryUtilities.memGetLong;
+import static com.gtnewhorizon.gtnhlib.bytebuf.MemoryUtilities.memPutInt;
+import static com.gtnewhorizon.gtnhlib.bytebuf.MemoryUtilities.memPutLong;
+
+
+/** {@link #create} returns null on any recoverable validation failure; callers must not record the placeholder. */
+public final class IndexedDrawCapture {
+    public final AttribLayoutKey layoutKey;
+    public final int drawMode;
+    public final int vertexCount;
+    public final int indexCount;
+    public final ByteBuffer vertexData;
+    public final ByteBuffer indexData;
+    public final BatchedIndexedDrawCmd placeholder;
+    private boolean freed;
+
+    public IndexedDrawCapture(AttribLayoutKey layoutKey, int drawMode, int vertexCount, int indexCount,
+                              ByteBuffer vertexData, ByteBuffer indexData,
+                              BatchedIndexedDrawCmd placeholder) {
+        this.layoutKey = layoutKey;
+        this.drawMode = drawMode;
+        this.vertexCount = vertexCount;
+        this.indexCount = indexCount;
+        this.vertexData = vertexData;
+        this.indexData = indexData;
+        this.placeholder = placeholder;
+    }
+
+    public void freeBuffers() {
+        if (freed) return;
+        freed = true;
+        if (vertexData != null) MemoryUtilities.memFree(vertexData);
+        if (indexData != null) MemoryUtilities.memFree(indexData);
+    }
+
+    public boolean isFreed() {
+        return freed;
+    }
+
+    private static final Set<String> WARN_ONCE = ConcurrentHashMap.newKeySet();
+
+    private static void warnOnce(String key, String fmt, Object... args) {
+        if (WARN_ONCE.add(key)) GLStateManager.LOGGER.warn(fmt, args);
+    }
+
+    public static IndexedDrawCapture create(int mode, int indicesCount, int srcIndexType, long indicesOffset, int eboId) {
+        if (indicesCount == 0) return null;
+        if (eboId == 0) {
+            warnOnce("no-ebo", "[IndexedDrawCapture] glDrawElements in display list with no EBO bound — skipping (mode={} count={} offset={})", mode, indicesCount, indicesOffset);
+            return null;
+        }
+        if (mode == GL11.GL_QUADS && (indicesCount % 4) != 0) {
+            warnOnce("quads-misaligned", "[IndexedDrawCapture] GL_QUADS with indicesCount={} not a multiple of 4 — skipping", indicesCount);
+            return null;
+        }
+        final int srcIndexSize = VertexAttribState.Attrib.glTypeSizeBytes(srcIndexType);
+        if (srcIndexSize <= 0) return null;
+
+        final int prevEBO = GLStateManager.getBoundEBO();
+        final int prevVBO = GLStateManager.getBoundVBO();
+        ByteBuffer eboSrc = null;
+        AttribSnapshot snap = null;
+        ByteBuffer vertexData = null;
+        ByteBuffer indexData = null;
+        boolean success = false;
+        try {
+            GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, eboId);
+            final int eboBufferSize = GLStateManager.glGetBufferParameteri(GL15.GL_ELEMENT_ARRAY_BUFFER, GL15.GL_BUFFER_SIZE);
+            if (eboBufferSize <= 0) {
+                warnOnce("ebo-size", "[IndexedDrawCapture] GL_BUFFER_SIZE={} for EBO {}", eboBufferSize, eboId);
+                return null;
+            }
+            final long eboReadSize = (long) indicesCount * srcIndexSize;
+            if (indicesOffset < 0 || indicesOffset + eboReadSize > eboBufferSize) {
+                warnOnce("ebo-range", "[IndexedDrawCapture] EBO range {}+{} exceeds buffer size {} — skipping", indicesOffset, eboReadSize, eboBufferSize);
+                return null;
+            }
+            eboSrc = MemoryUtilities.memAlloc((int) eboReadSize);
+            GLStateManager.glGetBufferSubData(GL15.GL_ELEMENT_ARRAY_BUFFER, indicesOffset, eboSrc);
+            final long eboSrcAddr = MemoryUtilities.memAddress0(eboSrc);
+
+            final long minMax = QuadConverter.scanMinMaxIndex(eboSrcAddr, srcIndexType, indicesCount);
+            if (minMax == -1L) {
+                warnOnce("min-max", "[IndexedDrawCapture] failed to determine min/max vertex for indexType={}", srcIndexType);
+                return null;
+            }
+            final int minVtx = (int) (minMax & 0xFFFFFFFFL);
+            final int maxVtx = (int) (minMax >>> 32);
+            final int vertexCount = maxVtx - minVtx + 1;
+
+            snap = AttribSnapshot.snapshot(minVtx, vertexCount);
+
+            int enabledCount = 0;
+            for (int i = 0; i < VertexAttribState.MAX_ATTRIBS; i++) {
+                if (snap.get(i) != null) enabledCount++;
+            }
+            if (enabledCount == 0) {
+                warnOnce("no-attribs", "[IndexedDrawCapture] no enabled attributes — skipping");
+                return null;
+            }
+            final int[] locations = new int[enabledCount];
+            final int[] sizes = new int[enabledCount];
+            final int[] types = new int[enabledCount];
+            final boolean[] normalized = new boolean[enabledCount];
+            int k = 0;
+            for (int i = 0; i < VertexAttribState.MAX_ATTRIBS; i++) {
+                final AttribSnapshot.AttribDesc d = snap.get(i);
+                if (d == null) continue;
+                locations[k] = i;
+                sizes[k] = d.size();
+                types[k] = d.type();
+                normalized[k] = d.normalized();
+                k++;
+            }
+            final AttribLayoutKey layoutKey = new AttribLayoutKey(locations, sizes, types, normalized);
+            final int tightStride = layoutKey.stride();
+
+            ByteBuffer sharedSrcBuffer = null;
+            long sharedSrcBase = 0;
+            int sharedSrcStride = -1;
+            boolean tightSrc = true;
+            for (int a = 0; a < enabledCount; a++) {
+                final AttribSnapshot.AttribDesc d = snap.get(locations[a]);
+                final int relOffset = (int) (d.offset() - d.readBufferBaseOffset());
+                if (a == 0) {
+                    sharedSrcBuffer = d.readBuffer();
+                    sharedSrcStride = d.effectiveStride();
+                    sharedSrcBase = MemoryUtilities.memAddress0(sharedSrcBuffer) + relOffset + (long) minVtx * sharedSrcStride;
+                    if (relOffset != layoutKey.offset(0)) tightSrc = false;
+                } else if (d.readBuffer() != sharedSrcBuffer || d.effectiveStride() != sharedSrcStride || relOffset != layoutKey.offset(a)) {
+                    tightSrc = false;
+                }
+            }
+            if (tightSrc && sharedSrcStride != tightStride) tightSrc = false;
+
+            vertexData = MemoryUtilities.memAlloc(vertexCount * tightStride);
+            final long dstAddr = MemoryUtilities.memAddress0(vertexData);
+            if (tightSrc) {
+                MemoryUtilities.memCopy(sharedSrcBase, dstAddr, (long) vertexCount * tightStride);
+            } else {
+                for (int a = 0; a < enabledCount; a++) {
+                    final AttribSnapshot.AttribDesc d = snap.get(locations[a]);
+                    final int attribBytes = d.size() * d.typeSizeBytes();
+                    final int srcStride = d.effectiveStride();
+                    final long srcStart = MemoryUtilities.memAddress0(d.readBuffer()) + (d.offset() - d.readBufferBaseOffset()) + (long) minVtx * srcStride;
+                    final long dstStart = dstAddr + layoutKey.offset(a);
+                    copyStrided(srcStart, srcStride, dstStart, tightStride, attribBytes, vertexCount);
+                }
+            }
+
+            final int bakedDrawMode;
+            final int bakedIndexCount;
+            if (mode == GL11.GL_QUADS) {
+                final int quadCount = indicesCount / 4;
+                bakedIndexCount = quadCount * 6;
+                indexData = MemoryUtilities.memAlloc(bakedIndexCount * 4);
+                QuadConverter.triangulateQuads(eboSrcAddr, srcIndexType, MemoryUtilities.memAddress0(indexData), GL11.GL_UNSIGNED_INT, quadCount, minVtx);
+                bakedDrawMode = GL11.GL_TRIANGLES;
+            } else {
+                bakedIndexCount = indicesCount;
+                indexData = MemoryUtilities.memAlloc(bakedIndexCount * 4);
+                QuadConverter.widenIndices(eboSrcAddr, srcIndexType, MemoryUtilities.memAddress0(indexData), GL11.GL_UNSIGNED_INT, indicesCount, minVtx);
+                bakedDrawMode = mode;
+            }
+
+            final BatchedIndexedDrawCmd placeholder = new BatchedIndexedDrawCmd();
+
+            final IndexedDrawCapture out = new IndexedDrawCapture(layoutKey, bakedDrawMode, vertexCount, bakedIndexCount, vertexData, indexData, placeholder);
+            success = true;
+            return out;
+        } finally {
+            if (eboSrc != null) MemoryUtilities.memFree(eboSrc);
+            if (snap != null) snap.free();
+            if (!success) {
+                if (vertexData != null) MemoryUtilities.memFree(vertexData);
+                if (indexData != null) MemoryUtilities.memFree(indexData);
+            }
+            GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, prevEBO);
+            GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, prevVBO);
+        }
+    }
+
+    /**
+     * Copy {@code attribBytes} per vertex from {@code src} (stride {@code srcStride}) to
+     * {@code dst} (stride {@code dstStride}) for {@code vertexCount} vertices.
+     *
+     * <p>Specializes on the common attribute sizes (4 / 8 / 12 / 16) so the hot path is
+     * one or two {@code memPut} calls per vertex instead of a JNI-ish {@code memCopy}
+     * dispatch. Falls through to {@code memCopy} for exotic sizes.
+     */
+    private static void copyStrided(long src, int srcStride, long dst, int dstStride, int attribBytes, int vertexCount) {
+        switch (attribBytes) {
+            case 4 -> {
+                for (int v = 0; v < vertexCount; v++) {
+                    memPutInt(dst, memGetInt(src));
+                    src += srcStride; dst += dstStride;
+                }
+            }
+            case 8 -> {
+                for (int v = 0; v < vertexCount; v++) {
+                    memPutLong(dst, memGetLong(src));
+                    src += srcStride; dst += dstStride;
+                }
+            }
+            case 12 -> {
+                for (int v = 0; v < vertexCount; v++) {
+                    memPutLong(dst, memGetLong(src));
+                    memPutInt(dst + 8, memGetInt(src + 8));
+                    src += srcStride; dst += dstStride;
+                }
+            }
+            case 16 -> {
+                for (int v = 0; v < vertexCount; v++) {
+                    memPutLong(dst, memGetLong(src));
+                    memPutLong(dst + 8, memGetLong(src + 8));
+                    src += srcStride; dst += dstStride;
+                }
+            }
+            default -> {
+                for (int v = 0; v < vertexCount; v++) {
+                    MemoryUtilities.memCopy(src, dst, attribBytes);
+                    src += srcStride; dst += dstStride;
+                }
+            }
+        }
+    }
+}

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/redirect/GLSMRedirector.java

@@ -4,16 +4,19 @@ import com.google.common.collect.ImmutableSet;
 import com.gtnewhorizon.gtnhlib.asm.ClassConstantPoolParser;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
+import org.objectweb.asm.Handle;
 import org.objectweb.asm.Opcodes;
 import org.objectweb.asm.tree.AbstractInsnNode;
 import org.objectweb.asm.tree.ClassNode;
 import org.objectweb.asm.tree.IntInsnNode;
+import org.objectweb.asm.tree.InvokeDynamicInsnNode;
 import org.objectweb.asm.tree.LdcInsnNode;
 import org.objectweb.asm.tree.MethodInsnNode;
 import org.objectweb.asm.tree.MethodNode;
 import org.objectweb.asm.tree.TypeInsnNode;
 
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -79,6 +82,9 @@ public class GLSMRedirector {
         glCapRedirects.put(org.lwjgl.opengl.GL11.GL_SCISSOR_TEST, "ScissorTest");
 
         final var gl11 = RedirectMap.newMap()
+            // glEnable/Disable - Special cased in GLSMRedirector, but included here for the external API
+            .add("glEnable")
+            .add("glDisable")
             .add("glAlphaFunc")
             .add("glBegin")
             .add("glBindTexture")
@@ -495,6 +501,22 @@ public class GLSMRedirector {
         return CORE_EXCLUSIONS.clone();
     }
 
+    /** The internal-name prefix used to match GL version classes (e.g., {@code "org/lwjgl/opengl/GL"}). */
+    public static String getGLPrefix() { return GL_PREFIX; }
+
+    /** The internal name of the redirect target class. */
+    public static String getTargetClassName() { return GLStateManager; }
+
+    /** Method redirects for GL-prefix classes. Key: original method name, Value: GLStateManager method name. */
+    public static Map<String, String> getGLPrefixMethodRedirects() {
+        return Collections.unmodifiableMap(glMethodRedirects);
+    }
+
+    /** Method redirects for named (non-GL-prefix) classes. Key: internal class name, Value: per-method redirect map. */
+    public static Map<String, Map<String, String>> getNamedClassMethodRedirects() {
+        return Collections.unmodifiableMap(methodRedirects);
+    }
+
     public boolean shouldTransform(byte[] basicClass) {
         return cstPoolParser.find(basicClass, true);
     }
@@ -504,7 +526,7 @@ public class GLSMRedirector {
         boolean changed = false;
         final boolean isOpenGlHelper = transformedName.equals("net.minecraft.client.renderer.OpenGlHelper");
 
-        for (MethodNode mn : cn.methods) {
+        for (MethodNode mn : (List<MethodNode>) cn.methods) {
             if (isOpenGlHelper && (mn.name.equals("glBlendFunc") || mn.name.equals("func_148821_a"))) {
                 continue;
             }
@@ -590,6 +612,22 @@ public class GLSMRedirector {
                             changed = true;
                         }
                     }
+                } else if (node instanceof InvokeDynamicInsnNode dynNode) {
+                    // Redirect method handles in invokedynamic bootstrap arguments
+                    for (int i = 0; i < dynNode.bsmArgs.length; i++) {
+                        if (!(dynNode.bsmArgs[i] instanceof Handle handle)) continue;
+                        final Map<String, String> redirects = handle.getOwner().startsWith(GL_PREFIX) ? glMethodRedirects : methodRedirects.get(handle.getOwner());
+                        if (redirects == null) continue;
+                        final String glsmName = redirects.get(handle.getName());
+                        if (glsmName == null) continue;
+                        if (LOG_SPAM) {
+                            final String shortOwner = handle.getOwner().substring(handle.getOwner().lastIndexOf("/") + 1);
+                            LOGGER.info("Redirecting invokedynamic handle in {} from {}.{}{} to GLStateManager.{}{}", transformedName, shortOwner, handle.getName(), handle.getDesc(), glsmName, handle.getDesc());
+                        }
+                        dynNode.bsmArgs[i] = new Handle(handle.getTag(), GLStateManager, glsmName, handle.getDesc());
+                        changed = true;
+                        redirectInMethod = true;
+                    }
                 }
             }
             if (ASSERT_MAIN_THREAD && redirectInMethod && !transformedName.startsWith(SplashProgress) && !(transformedName.startsWith(MinecraftClient) && ExcludedMinecraftMainThreadChecks.contains(mn.name))) {

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/states/MaterialState.java

@@ -103,9 +103,12 @@ public class MaterialState implements ISettableState<MaterialState> {
         }
     }
 
-    public void setShininess(FloatBuffer newBuffer) { setShininess(newBuffer.get()); }
+    // On the buffer versions of shininess, we need to call `get(0)` explicitly specifying the index
+    // otherwise calling `get()` advances the buffer position, and some mods may re-use the same buffer
+    // in subsequent calls, resulting in a BufferUnderflowException.
+    public void setShininess(FloatBuffer newBuffer) { setShininess(newBuffer.get(0)); }
 
-    public void setShininess(IntBuffer newBuffer) { setShininess((float) newBuffer.get());}
+    public void setShininess(IntBuffer newBuffer) { setShininess((float) newBuffer.get(0)); }
 
     public void setShininess(int val) { setShininess((float) val);}
 

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/states/VertexAttribState.java

@@ -16,16 +16,19 @@ public class VertexAttribState {
     private static final Int2ObjectOpenHashMap<Attrib[]> vaoAttribs = new Int2ObjectOpenHashMap<>();
     private static Attrib[] current;
     private static final ArrayDeque<Attrib[]> pool = new ArrayDeque<>();
+    private static int clientSideEnabledCount;
 
     public static void init(int defaultVAO) {
         vaoAttribs.clear();
         pool.clear();
         current = allocAttribArray();
         vaoAttribs.put(defaultVAO, current);
+        clientSideEnabledCount = 0;
     }
 
     public static void onBindVertexArray(int newVAO) {
         current = vaoAttribs.computeIfAbsent(newVAO, k -> allocAttribArray());
+        recomputeClientSideCount();
     }
 
     public static void onDeleteVertexArray(int vaoId) {
@@ -39,6 +42,7 @@ public class VertexAttribState {
         vaoAttribs.clear();
         pool.clear();
         current = null;
+        clientSideEnabledCount = 0;
     }
 
     private static Attrib[] allocAttribArray() {
@@ -55,6 +59,7 @@ public class VertexAttribState {
     public static void set(int index, int size, int type, boolean normalized, int stride, long offset, int vboId) {
         if (index < 0 || index >= MAX_ATTRIBS) return;
         final Attrib a = current[index];
+        final boolean was = a.isClientSide();
         a.size = size;
         a.type = type;
         a.normalized = normalized;
@@ -62,11 +67,13 @@ public class VertexAttribState {
         a.offset = offset;
         a.vboId = vboId;
         a.clientPointer = null;
+        if (was) clientSideEnabledCount--;
     }
 
     public static void set(int index, int size, int type, boolean normalized, int stride, ByteBuffer pointer, int vboId) {
         if (index < 0 || index >= MAX_ATTRIBS) return;
         final Attrib a = current[index];
+        final boolean was = a.isClientSide();
         a.size = size;
         a.type = type;
         a.normalized = normalized;
@@ -74,24 +81,41 @@ public class VertexAttribState {
         a.offset = 0;
         a.vboId = vboId;
         a.clientPointer = (vboId == 0) ? pointer : null;
+        final boolean now = a.isClientSide();
+        if (was != now) clientSideEnabledCount += now ? 1 : -1;
     }
 
     public static void setEnabled(int index, boolean enabled) {
         if (index < 0 || index >= MAX_ATTRIBS) return;
-        current[index].enabled = enabled;
+        final Attrib a = current[index];
+        if (a.clientPointer != null && a.enabled != enabled) {
+            clientSideEnabledCount += enabled ? 1 : -1;
+        }
+        a.enabled = enabled;
     }
 
     public static Attrib get(int index) {
         return current[index];
     }
 
-    public static boolean hasVBOBoundAttrib() {
+
+
+    private static void recomputeClientSideCount() {
+        int count = 0;
         for (int i = 0; i < MAX_ATTRIBS; i++) {
-            if (current[i].enabled && current[i].vboId != 0) return true;
+            if (current[i].isClientSide()) count++;
         }
-        return false;
+        clientSideEnabledCount = count;
     }
 
+    /**
+     * Returns true if any currently enabled vertex attribute was registered without a VBO
+     * (i.e. as a client-side pointer). In core profile, such attribs are treated as null
+     * offsets into a non-existent buffer, causing a native crash at draw time.
+     */
+    public static boolean hasAnyClientSideEnabledAttrib() {
+        return clientSideEnabledCount > 0;
+    }
     public static class Attrib {
         public boolean enabled;
         public int size;
@@ -102,6 +126,10 @@ public class VertexAttribState {
         public int vboId;
         public ByteBuffer clientPointer;
 
+        public boolean isClientSide() {
+            return enabled && clientPointer != null;
+        }
+
         public void reset() {
             enabled = false;
             size = 0;
@@ -132,6 +160,10 @@ public class VertexAttribState {
         }
 
         public float readComponent(ByteBuffer buf, int base, int component) {
+            return readComponent(type, normalized, buf, base, component);
+        }
+
+        public static float readComponent(int type, boolean normalized, ByteBuffer buf, int base, int component) {
             return switch (type) {
                 case GL11.GL_FLOAT -> buf.getFloat(base + component * 4);
                 case GL11.GL_DOUBLE -> (float) buf.getDouble(base + component * 8);

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/streaming/OrphanStreamingBuffer.java

@@ -1,5 +1,6 @@
 package com.gtnewhorizons.angelica.glsm.streaming;
 
+import com.gtnewhorizons.angelica.glsm.GLStateManager;
 import org.lwjgl.opengl.GL15;
 
 import java.nio.ByteBuffer;
@@ -40,7 +41,7 @@ public final class OrphanStreamingBuffer {
 
     public void destroy() {
         if (bufferId != 0) {
-            RENDER_BACKEND.deleteBuffers(bufferId);
+            GLStateManager.glDeleteBuffers(bufferId);
             bufferId = 0;
         }
     }

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/streaming/PersistentStreamingBuffer.java

@@ -1,5 +1,6 @@
 package com.gtnewhorizons.angelica.glsm.streaming;
 
+import com.gtnewhorizons.angelica.glsm.GLStateManager;
 import com.gtnewhorizons.angelica.glsm.RenderSystem;
 import it.unimi.dsi.fastutil.objects.ObjectArrayFIFOQueue;
 import org.embeddedt.embeddium.impl.gl.sync.GlFence;
@@ -52,7 +53,7 @@ public class PersistentStreamingBuffer implements StreamingBuffer {
         RENDER_BACKEND.bindBuffer(GL15.GL_ARRAY_BUFFER, 0);
 
         if (this.mappedBuffer == null) {
-            RENDER_BACKEND.deleteBuffers(bufferId);
+            GLStateManager.glDeleteBuffers(bufferId);
             bufferId = 0;
             throw new RuntimeException("Failed to persistently map streaming buffer");
         }
@@ -147,7 +148,7 @@ public class PersistentStreamingBuffer implements StreamingBuffer {
             RENDER_BACKEND.bindBuffer(GL15.GL_ARRAY_BUFFER, bufferId);
             RENDER_BACKEND.unmapBuffer(GL15.GL_ARRAY_BUFFER);
             RENDER_BACKEND.bindBuffer(GL15.GL_ARRAY_BUFFER, 0);
-            RENDER_BACKEND.deleteBuffers(bufferId);
+            GLStateManager.glDeleteBuffers(bufferId);
             bufferId = 0;
         }
     }

glsm/src/main/java/com/gtnewhorizons/angelica/glsm/streaming/TessellatorStreamingDrawer.java

@@ -1,16 +1,14 @@
-package com.gtnewhorizons.angelica.client.rendering;
+package com.gtnewhorizons.angelica.glsm.streaming;
 
 import com.gtnewhorizon.gtnhlib.client.renderer.DirectTessellator;
 import com.gtnewhorizon.gtnhlib.client.renderer.vertex.DefaultVertexFormat;
 import com.gtnewhorizon.gtnhlib.client.renderer.vertex.VertexFlags;
 import com.gtnewhorizon.gtnhlib.client.renderer.vertex.VertexFormat;
 import com.gtnewhorizons.angelica.glsm.GLStateManager;
+import com.gtnewhorizons.angelica.glsm.ITessellatorData;
 import com.gtnewhorizons.angelica.glsm.QuadConverter;
 import com.gtnewhorizons.angelica.glsm.RenderSystem;
 import com.gtnewhorizons.angelica.glsm.ffp.ShaderManager;
-import com.gtnewhorizons.angelica.glsm.streaming.OrphanStreamingBuffer;
-import com.gtnewhorizons.angelica.glsm.streaming.PersistentStreamingBuffer;
-import net.minecraft.client.renderer.Tessellator;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.lwjgl.opengl.GL11;
@@ -71,42 +69,42 @@ public class TessellatorStreamingDrawer {
     /**
      * Draw the vanilla Tessellator's data using streaming VBO+VAO instead of FFP client arrays.
      */
-    public static int draw(Tessellator tess) {
-        if (!tess.isDrawing) {
+    public static int draw(ITessellatorData tess) {
+        if (!tess.isDrawing()) {
             throw new IllegalStateException("Not tesselating!");
         }
 
-        tess.isDrawing = false;
+        tess.setDrawing(false);
 
-        final int vertexCount = tess.vertexCount;
+        final int vertexCount = tess.getVertexCount();
         if (vertexCount == 0) {
-            final int result = tess.rawBufferIndex * 4;
-            tess.reset();
+            final int result = tess.getRawBufferIndex() * 4;
+            tess.angelica$reset();
             return result;
         }
 
         // Determine the optimal vertex format from the tessellator's flags
-        final int flags = VertexFlags.convertToFlags(tess.hasTexture, tess.hasColor, tess.hasNormals, tess.hasBrightness);
+        final int flags = VertexFlags.convertToFlags(tess.hasTexture(), tess.hasColor(), tess.hasNormals(), tess.hasBrightness());
         final VertexFormat format = DefaultVertexFormat.ALL_FORMATS[flags];
         final int vertexSize = format.getVertexSize();
 
         final int requiredBytes = vertexCount * vertexSize;
         ensureRepackCapacity(requiredBytes);
 
-        final long writePtr = format.writeToBuffer0(repackAddress, tess.rawBuffer, tess.rawBufferIndex);
+        final long writePtr = format.writeToBuffer0(repackAddress, tess.getRawBuffer(), tess.getRawBufferIndex());
         repackBuffer.position(0);
         repackBuffer.limit((int)(writePtr - repackAddress));
 
-        uploadAndDraw(repackBuffer, flags, format, vertexSize, tess.drawMode, vertexCount);
+        uploadAndDraw(repackBuffer, flags, format, vertexSize, tess.getDrawMode(), vertexCount);
 
         // Shrink rawBuffer if oversized
-        if (tess.rawBufferSize > 0x20000 && tess.rawBufferIndex < (tess.rawBufferSize << 3)) {
-            tess.rawBufferSize = 0x10000;
-            tess.rawBuffer = new int[tess.rawBufferSize];
+        if (tess.getRawBufferSize() > 0x20000 && tess.getRawBufferIndex() < (tess.getRawBufferSize() << 3)) {
+            tess.setRawBufferSize(0x10000);
+            tess.setRawBuffer(new int[tess.getRawBufferSize()]);
         }
 
-        final int result = tess.rawBufferIndex * 4;
-        tess.reset();
+        final int result = tess.getRawBufferIndex() * 4;
+        tess.angelica$reset();
         return result;
     }
 
@@ -128,6 +126,19 @@ public class TessellatorStreamingDrawer {
         uploadAndDraw(buffer, flags, format, vertexSize, drawMode, vertexCount);
     }
 
+    /**
+     * Upload pre-packed vertex data and draw. Public API for external batch systems.
+     * @param packedData  buffer positioned at 0 with limit set to total bytes
+     * @param drawMode    GL draw mode (GL_QUADS, GL_TRIANGLES, etc.)
+     * @param flags       vertex format flags (from VertexFlags)
+     * @param vertexCount number of vertices
+     */
+    public static void drawPacked(ByteBuffer packedData, int drawMode, int flags, int vertexCount) {
+        final VertexFormat format = DefaultVertexFormat.ALL_FORMATS[flags];
+        final int vertexSize = format.getVertexSize();
+        uploadAndDraw(packedData, flags, format, vertexSize, drawMode, vertexCount);
+    }
+
     private static String cachedDebugInfo = "Stream: not initialized";
     private static long lastDebugUpdateNanos;
     private static final long DEBUG_UPDATE_INTERVAL_NS = 500_000_000L; // 500ms
@@ -172,34 +183,6 @@ public class TessellatorStreamingDrawer {
         }
     }
 
-    /**
-     * Draw a merged batch of pre-packed vertex data from a DeferredBatchTessellator.
-     * Copies byte ranges into repackBuffer, then uploads and draws.
-     */
-    static void drawPackedBatch(DeferredBatchTessellator source,
-                                java.util.List<DeferredBatchTessellator.DrawRange> ranges,
-                                int from, int to,
-                                int totalBytes, int totalVertices,
-                                int drawMode, int flags) {
-        if (totalVertices == 0) return;
-
-        final VertexFormat format = DefaultVertexFormat.ALL_FORMATS[flags];
-        final int vertexSize = format.getVertexSize();
-
-        ensureRepackCapacity(totalBytes);
-
-        long writePos = repackAddress;
-        for (int j = from; j < to; j++) {
-            final DeferredBatchTessellator.DrawRange r = ranges.get(j);
-            source.copyRange(r.byteOffset(), r.byteLength(), writePos);
-            writePos += r.byteLength();
-        }
-        repackBuffer.position(0);
-        repackBuffer.limit(totalBytes);
-
-        uploadAndDraw(repackBuffer, flags, format, vertexSize, drawMode, totalVertices);
-    }
-
     /**
      * Upload packed vertex data to a streaming buffer and issue the draw call.
      * Tries the persistent ring buffer first, falls back to orphan buffer on overflow.
@@ -239,7 +222,11 @@ public class TessellatorStreamingDrawer {
         }
     }
 
-    private static void ensureRepackCapacity(int requiredBytes) {
+    /**
+     * Ensure the repack buffer is large enough for the given byte count.
+     * Public for use by external batch systems that need to pack data before calling {@link #drawPacked}.
+     */
+    public static void ensureRepackCapacity(int requiredBytes) {
         if (requiredBytes <= repackCapacity) return;
 
         int newCapacity = repackCapacity;
@@ -253,6 +240,16 @@ public class TessellatorStreamingDrawer {
         repackCapacity = newCapacity;
     }
 
+    /** Get the repack buffer's native address. Valid until next {@link #ensureRepackCapacity} call. */
+    public static long getRepackAddress() {
+        return repackAddress;
+    }
+
+    /** Get the repack ByteBuffer. Caller must set position/limit before passing to {@link #drawPacked}. */
+    public static ByteBuffer getRepackBuffer() {
+        return repackBuffer;
+    }
+
     private static void ensureVAO(int flags, VertexFormat format) {
         init();
 

glsm/src/test/java/com/gtnewhorizons/angelica/glsm/CompatShaderTransformerTest.java

@@ -596,4 +596,21 @@ class CompatShaderTransformerTest {
         assertFalse(fragResult.contains("varying"), "no 'varying' keyword in fragment");
         assertTrue(fragResult.contains("in vec2 v_TexCoord"), "varying → in in fragment");
     }
+
+    @Test
+    void testReservedWordNewIsRenamed() {
+        String src = """
+            #version 120
+            uniform sampler2D tex;
+            void main() {
+                vec4 color = texture2D(tex, vec2(0.5));
+                float new = color.r > 0.5 ? 1.0 : 0.0;
+                gl_FragColor = vec4(new, new, new, 1.0);
+            }
+            """;
+
+        String result = CompatShaderTransformer.transform(src, true);
+        assertFalse(result.matches("(?s).*\\bnew\\b(?!\\s*\\().*"), "'new' as identifier must be renamed in core profile output\n\n" + result);
+        assertTrue(result.contains("angelica_renamed_new"), "'new' should be renamed to angelica_renamed_new\n\n" + result);
+    }
 }

glsm/src/test/java/com/gtnewhorizons/angelica/glsm/FeedbackManagerTest.java

@@ -156,6 +156,108 @@ class FeedbackManagerTest {
         GLStateManager.glDeleteVertexArrays(vao);
     }
 
+    @Test
+    void testPolygonFeedback_GL2D() {
+        final FloatBuffer buf = BufferUtils.createFloatBuffer(128);
+        FeedbackManager.glFeedbackBuffer(GL11.GL_2D, buf);
+        FeedbackManager.glRenderMode(GL11.GL_FEEDBACK);
+
+        GLStateManager.getModelViewMatrix().identity();
+        GLStateManager.getProjectionMatrix().identity();
+        GLStateManager.getViewportState().setViewPort(0, 0, 800, 600);
+        GLStateManager.getViewportState().setDepthRange(0.0, 1.0);
+
+        final int vao = GL30.glGenVertexArrays();
+        GLStateManager.glBindVertexArray(vao);
+
+        final float[] verts = {
+            0f, 0f, 0f,
+            1f, 0f, 0f,
+            1f, 1f, 0f,
+            0f, 1f, 0f
+        };
+        final FloatBuffer vertBuf = BufferUtils.createFloatBuffer(verts.length);
+        vertBuf.put(verts).flip();
+
+        final int vbo = GL15.glGenBuffers();
+        GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, vbo);
+        GL15.glBufferData(GL15.GL_ARRAY_BUFFER, vertBuf, GL15.GL_STATIC_DRAW);
+        GLStateManager.glVertexAttribPointer(0, 3, GL11.GL_FLOAT, false, 12, 0);
+        GLStateManager.glEnableVertexAttribArray(0);
+
+        FeedbackManager.processDrawArrays(GL11.GL_POLYGON, 0, 4);
+
+        final int count = FeedbackManager.glRenderMode(GL11.GL_RENDER);
+
+        assertEquals(10, count, "Polygon in GL_2D should produce 10 floats");
+        assertEquals(GL11.GL_POLYGON_TOKEN, buf.get(0), 0.001f);
+        assertEquals(4.0f, buf.get(1), 0.001f);
+        assertEquals(400.0f, buf.get(2), 0.01f);
+        assertEquals(300.0f, buf.get(3), 0.01f);
+        assertEquals(800.0f, buf.get(4), 0.01f);
+        assertEquals(300.0f, buf.get(5), 0.01f);
+        assertEquals(800.0f, buf.get(6), 0.01f);
+        assertEquals(600.0f, buf.get(7), 0.01f);
+        assertEquals(400.0f, buf.get(8), 0.01f);
+        assertEquals(600.0f, buf.get(9), 0.01f);
+
+        GLStateManager.glDisableVertexAttribArray(0);
+        GLStateManager.glBindVertexArray(0);
+        GL15.glDeleteBuffers(vbo);
+        GLStateManager.glDeleteVertexArrays(vao);
+    }
+
+    @Test
+    void testQuadStripFeedback_GL2D() {
+        final FloatBuffer buf = BufferUtils.createFloatBuffer(128);
+        FeedbackManager.glFeedbackBuffer(GL11.GL_2D, buf);
+        FeedbackManager.glRenderMode(GL11.GL_FEEDBACK);
+
+        GLStateManager.getModelViewMatrix().identity();
+        GLStateManager.getProjectionMatrix().identity();
+        GLStateManager.getViewportState().setViewPort(0, 0, 800, 600);
+        GLStateManager.getViewportState().setDepthRange(0.0, 1.0);
+
+        final int vao = GL30.glGenVertexArrays();
+        GLStateManager.glBindVertexArray(vao);
+
+        final float[] verts = {
+            0f, 0f, 0f,
+            0f, 1f, 0f,
+            1f, 0f, 0f,
+            1f, 1f, 0f
+        };
+        final FloatBuffer vertBuf = BufferUtils.createFloatBuffer(verts.length);
+        vertBuf.put(verts).flip();
+
+        final int vbo = GL15.glGenBuffers();
+        GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, vbo);
+        GL15.glBufferData(GL15.GL_ARRAY_BUFFER, vertBuf, GL15.GL_STATIC_DRAW);
+        GLStateManager.glVertexAttribPointer(0, 3, GL11.GL_FLOAT, false, 12, 0);
+        GLStateManager.glEnableVertexAttribArray(0);
+
+        FeedbackManager.processDrawArrays(GL11.GL_QUAD_STRIP, 0, 4);
+
+        final int count = FeedbackManager.glRenderMode(GL11.GL_RENDER);
+
+        assertEquals(10, count, "Quad strip in GL_2D should produce 10 floats");
+        assertEquals(GL11.GL_POLYGON_TOKEN, buf.get(0), 0.001f);
+        assertEquals(4.0f, buf.get(1), 0.001f);
+        assertEquals(400.0f, buf.get(2), 0.01f);
+        assertEquals(300.0f, buf.get(3), 0.01f);
+        assertEquals(400.0f, buf.get(4), 0.01f);
+        assertEquals(600.0f, buf.get(5), 0.01f);
+        assertEquals(800.0f, buf.get(6), 0.01f);
+        assertEquals(600.0f, buf.get(7), 0.01f);
+        assertEquals(800.0f, buf.get(8), 0.01f);
+        assertEquals(300.0f, buf.get(9), 0.01f);
+
+        GLStateManager.glDisableVertexAttribArray(0);
+        GLStateManager.glBindVertexArray(0);
+        GL15.glDeleteBuffers(vbo);
+        GLStateManager.glDeleteVertexArrays(vao);
+    }
+
     @Test
     void testIdentityTransform_viewportMapping() {
         final FloatBuffer buf = BufferUtils.createFloatBuffer(64);

glsm/src/test/java/com/gtnewhorizons/angelica/glsm/QuadConverterTest.java

@@ -0,0 +1,256 @@
+package com.gtnewhorizons.angelica.glsm;
+
+import com.gtnewhorizon.gtnhlib.bytebuf.MemoryUtilities;
+import org.junit.jupiter.api.Test;
+import org.lwjgl.opengl.GL11;
+
+import java.nio.ByteBuffer;
+
+import static com.gtnewhorizon.gtnhlib.bytebuf.MemoryUtilities.memAddress0;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+class QuadConverterTest {
+
+    @Test
+    void triangulateQuads_ubyteToUint_lastVertexConvention() {
+        // 2 quads: [0,1,2,3] and [4,5,6,7]. Expected LAST-convention output:
+        //   quad0 → (0,1,3), (1,2,3)
+        //   quad1 → (4,5,7), (5,6,7)
+        final ByteBuffer src = MemoryUtilities.memAlloc(8);
+        for (int i = 0; i < 8; i++) src.put(i, (byte) i);
+
+        final ByteBuffer dst = MemoryUtilities.memAlloc(12 * 4);
+        try {
+            QuadConverter.triangulateQuads(memAddress0(src), GL11.GL_UNSIGNED_BYTE, memAddress0(dst), GL11.GL_UNSIGNED_INT, 2);
+
+            assertUintIndices(dst, 0, 1, 3, 1, 2, 3, 4, 5, 7, 5, 6, 7);
+        } finally {
+            MemoryUtilities.memFree(src);
+            MemoryUtilities.memFree(dst);
+        }
+    }
+
+    @Test
+    void triangulateQuads_ushortToUshort_preservesType() {
+        // USHORT in, USHORT out — same-size path for live draws.
+        final ByteBuffer src = MemoryUtilities.memAlloc(4 * 2);
+        for (int i = 0; i < 4; i++) src.putShort(i * 2, (short) (i + 100));
+
+        final ByteBuffer dst = MemoryUtilities.memAlloc(6 * 2);
+        try {
+            QuadConverter.triangulateQuads(memAddress0(src), GL11.GL_UNSIGNED_SHORT, memAddress0(dst), GL11.GL_UNSIGNED_SHORT, 1);
+
+            assertUshortIndices(dst, 100, 101, 103, 101, 102, 103);
+        } finally {
+            MemoryUtilities.memFree(src);
+            MemoryUtilities.memFree(dst);
+        }
+    }
+
+    @Test
+    void triangulateQuads_ushortToUint_widens() {
+        final ByteBuffer src = MemoryUtilities.memAlloc(4 * 2);
+        for (int i = 0; i < 4; i++) src.putShort(i * 2, (short) (0xFF00 | i));
+
+        final ByteBuffer dst = MemoryUtilities.memAlloc(6 * 4);
+        try {
+            QuadConverter.triangulateQuads(memAddress0(src), GL11.GL_UNSIGNED_SHORT, memAddress0(dst), GL11.GL_UNSIGNED_INT, 1);
+
+            // Zero-extended USHORT→UINT, LAST winding.
+            assertUintIndices(dst, 0xFF00, 0xFF01, 0xFF03, 0xFF01, 0xFF02, 0xFF03);
+        } finally {
+            MemoryUtilities.memFree(src);
+            MemoryUtilities.memFree(dst);
+        }
+    }
+
+    @Test
+    void triangulateQuads_uintToUint_identity() {
+        final ByteBuffer src = MemoryUtilities.memAlloc(4 * 4);
+        for (int i = 0; i < 4; i++) src.putInt(i * 4, 1_000_000 + i);
+
+        final ByteBuffer dst = MemoryUtilities.memAlloc(6 * 4);
+        try {
+            QuadConverter.triangulateQuads(memAddress0(src), GL11.GL_UNSIGNED_INT, memAddress0(dst), GL11.GL_UNSIGNED_INT, 1);
+
+            assertUintIndices(dst, 1_000_000, 1_000_001, 1_000_003, 1_000_001, 1_000_002, 1_000_003);
+        } finally {
+            MemoryUtilities.memFree(src);
+            MemoryUtilities.memFree(dst);
+        }
+    }
+
+    @Test
+    void triangulateQuads_zeroQuads_noop() {
+        QuadConverter.triangulateQuads(0L, GL11.GL_UNSIGNED_INT, 0L, GL11.GL_UNSIGNED_INT, 0);
+    }
+
+    @Test
+    void triangulateQuads_unsupportedTypes_throw() {
+        final ByteBuffer src = MemoryUtilities.memAlloc(16);
+        final ByteBuffer dst = MemoryUtilities.memAlloc(24);
+        try {
+            assertThrows(IllegalArgumentException.class, () -> QuadConverter.triangulateQuads(memAddress0(src), GL11.GL_FLOAT, memAddress0(dst), GL11.GL_UNSIGNED_INT, 1));
+            assertThrows(IllegalArgumentException.class, () -> QuadConverter.triangulateQuads(memAddress0(src), GL11.GL_UNSIGNED_INT, memAddress0(dst), GL11.GL_UNSIGNED_BYTE, 1));
+        } finally {
+            MemoryUtilities.memFree(src);
+            MemoryUtilities.memFree(dst);
+        }
+    }
+
+    @Test
+    void widenIndices_ubyteToUint() {
+        final ByteBuffer src = MemoryUtilities.memAlloc(5);
+        for (int i = 0; i < 5; i++) src.put(i, (byte) (200 + i));
+
+        final ByteBuffer dst = MemoryUtilities.memAlloc(5 * 4);
+        try {
+            QuadConverter.widenIndices(memAddress0(src), GL11.GL_UNSIGNED_BYTE, memAddress0(dst), GL11.GL_UNSIGNED_INT, 5);
+
+            assertUintIndices(dst, 200, 201, 202, 203, 204);
+        } finally {
+            MemoryUtilities.memFree(src);
+            MemoryUtilities.memFree(dst);
+        }
+    }
+
+    @Test
+    void widenIndices_ushortToUint_zeroExtends() {
+        final ByteBuffer src = MemoryUtilities.memAlloc(3 * 2);
+        src.putShort(0, (short) 0xFFFF);
+        src.putShort(2, (short) 0x8001);
+        src.putShort(4, (short) 0);
+
+        final ByteBuffer dst = MemoryUtilities.memAlloc(3 * 4);
+        try {
+            QuadConverter.widenIndices(memAddress0(src), GL11.GL_UNSIGNED_SHORT, memAddress0(dst), GL11.GL_UNSIGNED_INT, 3);
+
+            assertUintIndices(dst, 0xFFFF, 0x8001, 0);
+        } finally {
+            MemoryUtilities.memFree(src);
+            MemoryUtilities.memFree(dst);
+        }
+    }
+
+    @Test
+    void widenIndices_uintToUint_copiesBitsExactly() {
+        final ByteBuffer src = MemoryUtilities.memAlloc(3 * 4);
+        src.putInt(0,  0x01234567);
+        src.putInt(4,  0xDEADBEEF);
+        src.putInt(8,  0);
+
+        final ByteBuffer dst = MemoryUtilities.memAlloc(3 * 4);
+        try {
+            QuadConverter.widenIndices(memAddress0(src), GL11.GL_UNSIGNED_INT, memAddress0(dst), GL11.GL_UNSIGNED_INT, 3);
+
+            assertUintIndices(dst, 0x01234567, 0xDEADBEEF, 0);
+        } finally {
+            MemoryUtilities.memFree(src);
+            MemoryUtilities.memFree(dst);
+        }
+    }
+
+    @Test
+    void scanMinMaxIndex_ushort_typical() {
+        final ByteBuffer src = MemoryUtilities.memAlloc(6 * 2);
+        final int[] data = {42, 7, 1000, 99, 500, 3};
+        for (int i = 0; i < data.length; i++) src.putShort(i * 2, (short) data[i]);
+
+        try {
+            final long packed = QuadConverter.scanMinMaxIndex(memAddress0(src), GL11.GL_UNSIGNED_SHORT, data.length);
+            final int min = (int) (packed & 0xFFFFFFFFL);
+            final int max = (int) (packed >>> 32);
+            assertEquals(3, min);
+            assertEquals(1000, max);
+        } finally {
+            MemoryUtilities.memFree(src);
+        }
+    }
+
+    @Test
+    void scanMinMaxIndex_emptyCountReturnsMinusOne() {
+        assertEquals(-1L, QuadConverter.scanMinMaxIndex(0L, GL11.GL_UNSIGNED_SHORT, 0));
+    }
+
+    @Test
+    void scanMinMaxIndex_unsupportedTypeReturnsMinusOne() {
+        final ByteBuffer src = MemoryUtilities.memAlloc(4);
+        try {
+            assertEquals(-1L, QuadConverter.scanMinMaxIndex(memAddress0(src), GL11.GL_FLOAT, 1));
+        } finally {
+            MemoryUtilities.memFree(src);
+        }
+    }
+
+    @Test
+    void scanMinMaxIndex_uintOverIntMaxRejected() {
+        // readIndex/writeIndex/rebase route UINT through signed int; values above
+        // Integer.MAX_VALUE would silently wrap. scanMinMaxIndex must bail.
+        final ByteBuffer src = MemoryUtilities.memAlloc(2 * 4);
+        src.putInt(0, 10);
+        src.putInt(4, 0x80000000); // 2^31
+        try {
+            assertEquals(-1L, QuadConverter.scanMinMaxIndex(memAddress0(src), GL11.GL_UNSIGNED_INT, 2));
+        } finally {
+            MemoryUtilities.memFree(src);
+        }
+    }
+
+    @Test
+    void scanMinMaxIndex_uintUpToIntMaxAccepted() {
+        final ByteBuffer src = MemoryUtilities.memAlloc(2 * 4);
+        src.putInt(0, 5);
+        src.putInt(4, Integer.MAX_VALUE);
+        try {
+            final long packed = QuadConverter.scanMinMaxIndex(memAddress0(src), GL11.GL_UNSIGNED_INT, 2);
+            assertEquals(5, (int) (packed & 0xFFFFFFFFL));
+            assertEquals(Integer.MAX_VALUE, (int) (packed >>> 32));
+        } finally {
+            MemoryUtilities.memFree(src);
+        }
+    }
+
+    @Test
+    void widenIndices_ubyteDstRejected() {
+        // UBYTE is not a supported destination — widening only.
+        final ByteBuffer src = MemoryUtilities.memAlloc(2);
+        src.put(0, (byte) 1).put(1, (byte) 2);
+        final ByteBuffer dst = MemoryUtilities.memAlloc(2);
+        try {
+            assertThrows(IllegalArgumentException.class,
+                () -> QuadConverter.widenIndices(memAddress0(src), GL11.GL_UNSIGNED_BYTE, memAddress0(dst), GL11.GL_UNSIGNED_BYTE, 2));
+        } finally {
+            MemoryUtilities.memFree(src);
+            MemoryUtilities.memFree(dst);
+        }
+    }
+
+    @Test
+    void triangulateQuads_ubyteDstRejected() {
+        final ByteBuffer src = MemoryUtilities.memAlloc(4);
+        for (int i = 0; i < 4; i++) src.put(i, (byte) i);
+        final ByteBuffer dst = MemoryUtilities.memAlloc(6);
+        try {
+            assertThrows(IllegalArgumentException.class,
+                () -> QuadConverter.triangulateQuads(memAddress0(src), GL11.GL_UNSIGNED_BYTE, memAddress0(dst), GL11.GL_UNSIGNED_BYTE, 1));
+        } finally {
+            MemoryUtilities.memFree(src);
+            MemoryUtilities.memFree(dst);
+        }
+    }
+
+    // === helpers ===
+
+    private static void assertUintIndices(ByteBuffer buf, int... expected) {
+        for (int i = 0; i < expected.length; i++) {
+            assertEquals(expected[i], buf.getInt(i * 4), "uint index[" + i + "]");
+        }
+    }
+
+    private static void assertUshortIndices(ByteBuffer buf, int... expected) {
+        for (int i = 0; i < expected.length; i++) {
+            assertEquals(expected[i], buf.getShort(i * 2) & 0xFFFF, "ushort index[" + i + "]");
+        }
+    }
+}

glsm/src/test/java/com/gtnewhorizons/angelica/glsm/SharedDrawableVaoTest.java

@@ -0,0 +1,79 @@
+package com.gtnewhorizons.angelica.glsm;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.lwjgl.LWJGLException;
+import org.lwjgl.opengl.ContextAttribs;
+import org.lwjgl.opengl.Display;
+import org.lwjgl.opengl.DisplayMode;
+import org.lwjgl.opengl.GL11;
+import org.lwjgl.opengl.GL20;
+import org.lwjgl.opengl.GL30;
+import org.lwjgl.opengl.PixelFormat;
+import org.lwjgl.opengl.SharedDrawable;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assumptions.assumeTrue;
+
+class SharedDrawableVaoTest {
+
+    private static final String VERT_330 = "#version 330 core\nvoid main() { gl_Position = vec4(0.0); }\n";
+    private static final String FRAG_330 = "#version 330 core\nout vec4 o;\nvoid main() { o = vec4(0.0); }\n";
+
+    @BeforeAll
+    static void createContext() throws LWJGLException {
+        assumeTrue(!Display.isCreated(), "inherited Display -- skipping to avoid profile drift");
+        Display.setDisplayModeAndFullscreen(new DisplayMode(800, 600));
+        Display.setResizable(false);
+        Display.setFullscreen(false);
+        Display.create(
+            new PixelFormat().withDepthBits(24).withStencilBits(8),
+            new ContextAttribs(4, 1).withProfileCore(true).withForwardCompatible(true));
+        GL30.glBindVertexArray(GL30.glGenVertexArrays());
+    }
+
+    @AfterAll
+    static void destroyContext() {
+        if (Display.isCreated()) Display.destroy();
+    }
+
+    @Test
+    void validateProgramSucceedsOnSharedDrawableWithVao() throws LWJGLException {
+        SharedDrawable shared = new SharedDrawable(Display.getDrawable());
+        Display.getDrawable().releaseContext();
+        shared.makeCurrent();
+        try {
+            GL30.glBindVertexArray(GL30.glGenVertexArrays());
+            int program = linkTrivialProgram();
+            GL20.glValidateProgram(program);
+            assertEquals(GL11.GL_TRUE, GL20.glGetProgrami(program, GL20.GL_VALIDATE_STATUS), () -> GL20.glGetProgramInfoLog(program, 4096));
+            GL20.glDeleteProgram(program);
+        } finally {
+            shared.releaseContext();
+            Display.getDrawable().makeCurrent();
+            shared.destroy();
+        }
+    }
+
+    private static int linkTrivialProgram() {
+        int vs = compile(GL20.GL_VERTEX_SHADER, VERT_330);
+        int fs = compile(GL20.GL_FRAGMENT_SHADER, FRAG_330);
+        int program = GL20.glCreateProgram();
+        GL20.glAttachShader(program, vs);
+        GL20.glAttachShader(program, fs);
+        GL20.glLinkProgram(program);
+        assertEquals(GL11.GL_TRUE, GL20.glGetProgrami(program, GL20.GL_LINK_STATUS), () -> GL20.glGetProgramInfoLog(program, 4096));
+        GL20.glDeleteShader(vs);
+        GL20.glDeleteShader(fs);
+        return program;
+    }
+
+    private static int compile(int type, String src) {
+        int shader = GL20.glCreateShader(type);
+        GL20.glShaderSource(shader, src);
+        GL20.glCompileShader(shader);
+        assertEquals(GL11.GL_TRUE, GL20.glGetShaderi(shader, GL20.GL_COMPILE_STATUS), () -> GL20.glGetShaderInfoLog(shader, 4096));
+        return shader;
+    }
+}

glsm/src/test/java/com/gtnewhorizons/angelica/glsm/architecture/DeletePathConventionTest.java

@@ -0,0 +1,72 @@
+package com.gtnewhorizons.angelica.glsm.architecture;
+
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import java.util.stream.Stream;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class DeletePathConventionTest {
+
+    private static final Pattern FORBIDDEN = Pattern.compile("\\bRENDER_BACKEND\\s*\\.\\s*delete[A-Z][A-Za-z]*\\b");
+    private static final String ALLOWLIST_MARKER = "// glsm-allow-direct-delete:";
+
+    /** Only this file is allowed to call RENDER_BACKEND.delete* — it is the cache-invalidation layer. */
+    private static final String GATEKEEPER_FILE_NAME = "GLStateManager.java";
+
+    @Test
+    void glsmMainSources_onlyCallBackendDeleteFromGLStateManager() throws IOException {
+        final Path root = locateGlsmMainRoot();
+        final List<String> violations = new ArrayList<>();
+
+        try (Stream<Path> paths = Files.walk(root)) {
+            paths.filter(Files::isRegularFile)
+                .filter(p -> p.toString().endsWith(".java"))
+                .filter(p -> !p.getFileName().toString().equals(GATEKEEPER_FILE_NAME))
+                .forEach(p -> scanFile(p, violations));
+        }
+
+        assertTrue(violations.isEmpty(),
+            () -> "Direct RENDER_BACKEND.delete*(...) call found outside " + GATEKEEPER_FILE_NAME + ".\n"
+                + "Use GLStateManager.glDelete*() instead\n"
+                + "Violations:\n  " + String.join("\n  ", violations));
+    }
+
+    private static void scanFile(Path file, List<String> violations) {
+        final List<String> lines;
+        try {
+            lines = Files.readAllLines(file, StandardCharsets.UTF_8);
+        } catch (IOException e) {
+            violations.add(file + ": I/O error reading file: " + e.getMessage());
+            return;
+        }
+        for (int i = 0; i < lines.size(); i++) {
+            final String line = lines.get(i);
+            final Matcher m = FORBIDDEN.matcher(line);
+            if (!m.find()) continue;
+            if (line.contains(ALLOWLIST_MARKER)) continue;
+            violations.add(file + ":" + (i + 1) + "  " + line.trim());
+        }
+    }
+
+    private static Path locateGlsmMainRoot() {
+        final String[] candidates = {
+            "src/main/java/com/gtnewhorizons/angelica/glsm",
+            "glsm/src/main/java/com/gtnewhorizons/angelica/glsm",
+        };
+        for (String c : candidates) {
+            final Path p = Paths.get(c).toAbsolutePath();
+            if (Files.isDirectory(p)) return p;
+        }
+        throw new IllegalStateException("Could not find glsm main sources — cwd=" + Paths.get("").toAbsolutePath());
+    }
+}

glsm/src/test/java/com/gtnewhorizons/angelica/glsm/recording/IndexedDrawBatchBuilderTest.java

@@ -0,0 +1,531 @@
+package com.gtnewhorizons.angelica.glsm.recording;
+
+import com.gtnewhorizon.gtnhlib.bytebuf.MemoryUtilities;
+import com.gtnewhorizons.angelica.glsm.DisplayListManager;
+import com.gtnewhorizons.angelica.glsm.GLStateManager;
+import com.gtnewhorizons.angelica.glsm.recording.commands.BatchedIndexedDrawCmd;
+import com.gtnewhorizons.angelica.glsm.recording.commands.IndexedDrawBatch;
+import com.gtnewhorizons.angelica.glsm.recording.support.DisplayListTestFixture;
+import com.gtnewhorizons.angelica.glsm.states.VertexAttribState;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+import org.lwjgl.BufferUtils;
+import org.lwjgl.opengl.GL11;
+import org.lwjgl.opengl.GL15;
+import org.lwjgl.opengl.GL30;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class IndexedDrawBatchBuilderTest extends DisplayListTestFixture {
+
+    @Test
+    void singleDraw_bakedSurvivesVboMutation() {
+        final int vbo = defaultQuadVbo();
+        final int ebo = uploadEbo(GL11.GL_UNSIGNED_SHORT, 0, 1, 2, 2, 3, 0);
+        final int vao = setupPosColorVao(vbo);
+        final int list = recordSingleIndexedDraw(vao, ebo, GL11.GL_TRIANGLES, 6, GL11.GL_UNSIGNED_SHORT);
+
+        final BatchedIndexedDrawCmd cmd = firstBatchedCmd(list);
+        assertNotNull(cmd);
+        assertEquals(GL11.GL_TRIANGLES, cmd.getDrawMode());
+        assertEquals(6, cmd.getIndexCount());
+        assertEquals(GL11.GL_UNSIGNED_INT, cmd.getIndexType(), "batched indices always widen to GL_UNSIGNED_INT");
+
+        // Overwrite source VBO with garbage — baked batch must be unaffected.
+        overwriteBufferWithGarbage(GL15.GL_ARRAY_BUFFER, vbo, 4 * POS_COLOR_STRIDE);
+
+        final ByteBuffer read = readBufferBytes(GL15.GL_ARRAY_BUFFER, firstBatch(list).getSharedVBO(), 4 * POS_COLOR_STRIDE);
+        for (int i = 0; i < 4; i++) {
+            assertEquals(DEFAULT_QUAD_POSITIONS[i * 2], read.getFloat(i * POS_COLOR_STRIDE), 0f, "pos.x v=" + i);
+            assertEquals(DEFAULT_QUAD_POSITIONS[i * 2 + 1], read.getFloat(i * POS_COLOR_STRIDE + 4), 0f, "pos.y v=" + i);
+            for (int c = 0; c < 4; c++) {
+                assertEquals(DEFAULT_SOLID_COLORS[i][c], read.get(i * POS_COLOR_STRIDE + 8 + c), "color v=" + i + " c=" + c);
+            }
+        }
+        MemoryUtilities.memFree(read);
+    }
+
+    @Test
+    void compileAndExecute_firesLiveAndBakes() {
+        final int vbo = defaultQuadVbo();
+        final int ebo = uploadEbo(GL11.GL_UNSIGNED_SHORT, 0, 1, 2);
+        final int vao = setupPosColorVao(vbo);
+
+        final int list = newList();
+        GLStateManager.glNewList(list, GL11.GL_COMPILE_AND_EXECUTE);
+        GLStateManager.glBindVertexArray(vao);
+        GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, ebo);
+        GLStateManager.glDrawElements(GL11.GL_TRIANGLES, 3, GL11.GL_UNSIGNED_SHORT, 0L);
+        GLStateManager.glBindVertexArray(0);
+        GLStateManager.glEndList();
+
+        final BatchedIndexedDrawCmd cmd = firstBatchedCmd(list);
+        assertNotNull(cmd);
+        assertEquals(3, cmd.getIndexCount());
+    }
+
+    @Test
+    void quads_triangulateAtRecord() {
+        final int vbo = defaultQuadVbo();
+        final int ebo = uploadEbo(GL11.GL_UNSIGNED_SHORT, 0, 1, 2, 3);
+        final int vao = setupPosColorVao(vbo);
+        final int list = recordSingleIndexedDraw(vao, ebo, GL11.GL_QUADS, 4, GL11.GL_UNSIGNED_SHORT);
+
+        final BatchedIndexedDrawCmd cmd = firstBatchedCmd(list);
+        assertNotNull(cmd);
+        assertEquals(GL11.GL_TRIANGLES, cmd.getDrawMode());
+        assertEquals(6, cmd.getIndexCount());
+
+        // EBO is widened to UNSIGNED_INT and uses GL_LAST_VERTEX_CONVENTION:
+        // (a,b,d,b,c,d) — v3 is the provoking vertex for both triangles, diagonal b→d.
+        final ByteBuffer ib = readBufferBytes(GL15.GL_ELEMENT_ARRAY_BUFFER, firstBatch(list).getSharedEBO(), 6 * 4);
+        assertUintIndices(ib, 0, 1, 3, 1, 2, 3);
+        MemoryUtilities.memFree(ib);
+    }
+
+    @Test
+    void offsetAndMinMaxRebase() {
+        // 8-vertex VBO; draw references only vertices 5..7 via a 6L byte offset into the EBO.
+        final float[] positions = new float[16];
+        final byte[][] colors = new byte[8][4];
+        for (int i = 0; i < 8; i++) {
+            positions[i * 2] = i;
+            positions[i * 2 + 1] = i * 2;
+            colors[i][0] = (byte) i;
+            colors[i][1] = (byte) (i + 1);
+            colors[i][2] = (byte) (i + 2);
+            colors[i][3] = (byte) (i + 3);
+        }
+        final int vbo = uploadPosColorVbo(positions, colors);
+        final int ebo = uploadEbo(GL11.GL_UNSIGNED_SHORT, 0, 1, 2,   5, 6, 7);
+        final int vao = setupPosColorVao(vbo);
+
+        final int list = newList();
+        GLStateManager.glNewList(list, GL11.GL_COMPILE);
+        GLStateManager.glBindVertexArray(vao);
+        GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, ebo);
+        GLStateManager.glDrawElements(GL11.GL_TRIANGLES, 3, GL11.GL_UNSIGNED_SHORT, 6L);
+        GLStateManager.glBindVertexArray(0);
+        GLStateManager.glEndList();
+
+        assertEquals(1, allBatchedCmds(list).size());
+
+        final IndexedDrawBatch batch = firstBatch(list);
+        final ByteBuffer ib = readBufferBytes(GL15.GL_ELEMENT_ARRAY_BUFFER, batch.getSharedEBO(), 3 * 4);
+        // Indices rebased against the tight [minVtx..maxVtx] range.
+        assertUintIndices(ib, 0, 1, 2);
+        MemoryUtilities.memFree(ib);
+
+        final ByteBuffer vboRead = readBufferBytes(GL15.GL_ARRAY_BUFFER, batch.getSharedVBO(), 3 * POS_COLOR_STRIDE);
+        for (int i = 0; i < 3; i++) {
+            final int orig = 5 + i;
+            assertEquals(positions[orig * 2], vboRead.getFloat(i * POS_COLOR_STRIDE), 0f, "pos.x v=" + orig);
+            assertEquals(positions[orig * 2 + 1], vboRead.getFloat(i * POS_COLOR_STRIDE + 4), 0f, "pos.y v=" + orig);
+            for (int c = 0; c < 4; c++) {
+                assertEquals(colors[orig][c], vboRead.get(i * POS_COLOR_STRIDE + 8 + c), "col v=" + orig + " c=" + c);
+            }
+        }
+        MemoryUtilities.memFree(vboRead);
+    }
+
+    @ParameterizedTest(name = "indexType=0x{0}")
+    @ValueSource(ints = {GL11.GL_UNSIGNED_BYTE, GL11.GL_UNSIGNED_SHORT, GL11.GL_UNSIGNED_INT})
+    void anyIndexType_widensToUnsignedInt(int indexType) {
+        final int vbo = defaultQuadVbo();
+        final int ebo = uploadEbo(indexType, 0, 1, 2, 2, 3, 0);
+        final int vao = setupPosColorVao(vbo);
+        final int list = recordSingleIndexedDraw(vao, ebo, GL11.GL_TRIANGLES, 6, indexType);
+
+        final BatchedIndexedDrawCmd cmd = firstBatchedCmd(list);
+        assertNotNull(cmd);
+        assertEquals(6, cmd.getIndexCount());
+        assertEquals(GL11.GL_UNSIGNED_INT, cmd.getIndexType(), "batching always widens indices to UINT for safe base-vertex shifting");
+    }
+
+    @Test
+    void emptyRecorder_producesNoBatches() {
+        final int list = newList();
+        GLStateManager.glNewList(list, GL11.GL_COMPILE);
+        GLStateManager.glEndList();
+
+        assertTrue(batchesOf(list).isEmpty(), "recorder with no draws produces no batches");
+        assertTrue(allBatchedCmds(list).isEmpty(), "no placeholders either");
+    }
+
+    @Test
+    void noEboBoundSkipsAndDoesNotBake() {
+        final int vbo = defaultQuadVbo();
+        final int vao = setupPosColorVao(vbo);
+
+        final int list = newList();
+        GLStateManager.glNewList(list, GL11.GL_COMPILE);
+        GLStateManager.glBindVertexArray(vao);
+        GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, 0);
+        GLStateManager.glDrawElements(GL11.GL_TRIANGLES, 3, GL11.GL_UNSIGNED_SHORT, 0L);
+        GLStateManager.glBindVertexArray(0);
+        GLStateManager.glEndList();
+
+        assertTrue(allBatchedCmds(list).isEmpty(), "no EBO bound → no batched command attached");
+        assertTrue(batchesOf(list).isEmpty(), "no batches either");
+    }
+
+    @Test
+    void customLoc3FloatAttribRoundtrips() {
+        // 4-attrib layout: pos(2f) | uv(2f) | col(4ub) | texBounds(4f) = 36 bytes/vertex.
+        final int STRIDE = 36;
+        final int N = 4;
+        final float[][] pos = {{0f,0f},{1f,0f},{1f,1f},{0f,1f}};
+        final float[][] uv  = {{0.1f,0.2f},{0.3f,0.4f},{0.5f,0.6f},{0.7f,0.8f}};
+        final byte[][] col  = {{10,20,30,40},{50,60,70,(byte)80},{(byte)90,(byte)100,(byte)110,(byte)120},{(byte)130,(byte)140,(byte)150,(byte)160}};
+        final float[][] tb  = {{1f,2f,3f,4f},{5f,6f,7f,8f},{9f,10f,11f,12f},{13f,14f,15f,16f}};
+        final int vbo = newBuffer();
+        final ByteBuffer data = MemoryUtilities.memAlloc(N * STRIDE).order(ByteOrder.nativeOrder());
+        for (int i = 0; i < N; i++) {
+            data.putFloat(pos[i][0]); data.putFloat(pos[i][1]);
+            data.putFloat(uv[i][0]);  data.putFloat(uv[i][1]);
+            data.put(col[i][0]); data.put(col[i][1]); data.put(col[i][2]); data.put(col[i][3]);
+            data.putFloat(tb[i][0]); data.putFloat(tb[i][1]); data.putFloat(tb[i][2]); data.putFloat(tb[i][3]);
+        }
+        data.flip();
+        GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, vbo);
+        GL15.glBufferData(GL15.GL_ARRAY_BUFFER, data, GL15.GL_STATIC_DRAW);
+        GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);
+        MemoryUtilities.memFree(data);
+
+        final int vao = newVao();
+        GLStateManager.glBindVertexArray(vao);
+        GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, vbo);
+        GLStateManager.glVertexAttribPointer(0, 2, GL11.GL_FLOAT, false, STRIDE, 0);
+        GLStateManager.glEnableVertexAttribArray(0);
+        GLStateManager.glVertexAttribPointer(1, 2, GL11.GL_FLOAT, false, STRIDE, 8);
+        GLStateManager.glEnableVertexAttribArray(1);
+        GLStateManager.glVertexAttribPointer(2, 4, GL11.GL_UNSIGNED_BYTE, true, STRIDE, 16);
+        GLStateManager.glEnableVertexAttribArray(2);
+        GLStateManager.glVertexAttribPointer(3, 4, GL11.GL_FLOAT, false, STRIDE, 20);
+        GLStateManager.glEnableVertexAttribArray(3);
+        GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);
+        GLStateManager.glBindVertexArray(0);
+
+        final int ebo = uploadEbo(GL11.GL_UNSIGNED_SHORT, 0, 1, 2, 2, 3, 0);
+        final int list = recordSingleIndexedDraw(vao, ebo, GL11.GL_TRIANGLES, 6, GL11.GL_UNSIGNED_SHORT);
+
+        assertNotNull(firstBatchedCmd(list), "loc3 attrib should not cause the baker to skip");
+
+        // Baked layout is tight interleaved in ascending-location order — same stride as source.
+        final ByteBuffer read = readBufferBytes(GL15.GL_ARRAY_BUFFER, firstBatch(list).getSharedVBO(), N * STRIDE);
+        for (int i = 0; i < N; i++) {
+            final int base = i * STRIDE;
+            assertEquals(pos[i][0], read.getFloat(base), 0f, "pos.x v=" + i);
+            assertEquals(pos[i][1], read.getFloat(base + 4), 0f, "pos.y v=" + i);
+            assertEquals(uv[i][0],  read.getFloat(base + 8), 0f, "uv.s v=" + i);
+            assertEquals(uv[i][1],  read.getFloat(base + 12), 0f, "uv.t v=" + i);
+            for (int c = 0; c < 4; c++) {
+                assertEquals(col[i][c], read.get(base + 16 + c), "col v=" + i + " c=" + c);
+            }
+            for (int c = 0; c < 4; c++) {
+                assertEquals(tb[i][c], read.getFloat(base + 20 + c * 4), 0f, "tb v=" + i + " c=" + c);
+            }
+        }
+        MemoryUtilities.memFree(read);
+    }
+
+    @Test
+    void glDeleteLists_freesBatchedObjects() {
+        final int vbo = defaultQuadVbo();
+        final int ebo = uploadEbo(GL11.GL_UNSIGNED_SHORT, 0, 1, 2);
+        final int vao = setupPosColorVao(vbo);
+        final int list = recordSingleIndexedDraw(vao, ebo, GL11.GL_TRIANGLES, 3, GL11.GL_UNSIGNED_SHORT);
+
+        final IndexedDrawBatch batch = firstBatch(list);
+        final int sharedVAO = batch.getSharedVAO();
+        final int sharedVBO = batch.getSharedVBO();
+        final int sharedEBO = batch.getSharedEBO();
+        assertTrue(GL15.glIsBuffer(sharedVBO), "shared VBO live");
+        assertTrue(GL15.glIsBuffer(sharedEBO), "shared EBO live");
+        assertTrue(GL30.glIsVertexArray(sharedVAO), "shared VAO live");
+
+        GLStateManager.glDeleteLists(list, 1);
+        untrackList(list);
+
+        assertFalse(GL15.glIsBuffer(sharedVBO), "shared VBO freed");
+        assertFalse(GL15.glIsBuffer(sharedEBO), "shared EBO freed");
+        assertFalse(GL30.glIsVertexArray(sharedVAO), "shared VAO freed");
+    }
+
+    @Test
+    void reRecord_freesOldBatchedObjects() {
+        final int vbo = defaultQuadVbo();
+        final int ebo = uploadEbo(GL11.GL_UNSIGNED_SHORT, 0, 1, 2);
+        final int vao = setupPosColorVao(vbo);
+        final int list = recordSingleIndexedDraw(vao, ebo, GL11.GL_TRIANGLES, 3, GL11.GL_UNSIGNED_SHORT);
+
+        final IndexedDrawBatch first = firstBatch(list);
+        final int oldVAO = first.getSharedVAO();
+        final int oldVBO = first.getSharedVBO();
+        final int oldEBO = first.getSharedEBO();
+
+        GLStateManager.glNewList(list, GL11.GL_COMPILE);
+        GLStateManager.glBindVertexArray(vao);
+        GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, ebo);
+        GLStateManager.glDrawElements(GL11.GL_TRIANGLES, 3, GL11.GL_UNSIGNED_SHORT, 0L);
+        GLStateManager.glBindVertexArray(0);
+        GLStateManager.glEndList();
+
+        assertFalse(GL15.glIsBuffer(oldVBO), "old shared VBO freed on re-record");
+        assertFalse(GL15.glIsBuffer(oldEBO), "old shared EBO freed on re-record");
+        assertFalse(GL30.glIsVertexArray(oldVAO), "old shared VAO freed on re-record");
+    }
+
+    @Test
+    void clientPointerAttribsBakeIntoSharedVbo() {
+        final int N = 4;
+        final ByteBuffer clientData = BufferUtils.createByteBuffer(N * POS_COLOR_STRIDE).order(ByteOrder.nativeOrder());
+        final float[][] pos = {{0f,0f},{1f,0f},{1f,1f},{0f,1f}};
+        final byte[][] col  = {{(byte)0xAA,(byte)0xBB,(byte)0xCC,(byte)0xDD},
+                               {(byte)0x11,(byte)0x22,(byte)0x33,(byte)0x44},
+                               {(byte)0x55,(byte)0x66,(byte)0x77,(byte)0x88},
+                               {(byte)0x99,(byte)0x00,(byte)0x0F,(byte)0xF0}};
+        for (int i = 0; i < N; i++) {
+            clientData.putFloat(pos[i][0]); clientData.putFloat(pos[i][1]);
+            clientData.put(col[i][0]); clientData.put(col[i][1]);
+            clientData.put(col[i][2]); clientData.put(col[i][3]);
+        }
+        clientData.flip();
+
+        final int vao = newVao();
+        GLStateManager.glBindVertexArray(vao);
+        GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);
+        final ByteBuffer colorSlice = clientData.duplicate().order(ByteOrder.nativeOrder());
+        colorSlice.position(8);
+        VertexAttribState.set(0, 2, GL11.GL_FLOAT, false, POS_COLOR_STRIDE, clientData, 0);
+        VertexAttribState.setEnabled(0, true);
+        VertexAttribState.set(1, 4, GL11.GL_UNSIGNED_BYTE, true, POS_COLOR_STRIDE, colorSlice, 0);
+        VertexAttribState.setEnabled(1, true);
+        GLStateManager.glBindVertexArray(0);
+
+        final int ebo = uploadEbo(GL11.GL_UNSIGNED_SHORT, 0, 1, 2);
+        final int list = recordSingleIndexedDraw(vao, ebo, GL11.GL_TRIANGLES, 3, GL11.GL_UNSIGNED_SHORT);
+
+        assertNotNull(firstBatchedCmd(list));
+
+        // Tight interleaved baked layout for 3 drawn vertices = 36 bytes total.
+        final ByteBuffer owned = readBufferBytes(GL15.GL_ARRAY_BUFFER, firstBatch(list).getSharedVBO(), 3 * POS_COLOR_STRIDE);
+        for (int i = 0; i < 3; i++) {
+            assertEquals(pos[i][0], owned.getFloat(i * POS_COLOR_STRIDE), 0f, "loc0 pos.x v=" + i);
+            assertEquals(pos[i][1], owned.getFloat(i * POS_COLOR_STRIDE + 4), 0f, "loc0 pos.y v=" + i);
+            for (int c = 0; c < 4; c++) {
+                assertEquals(col[i][c], owned.get(i * POS_COLOR_STRIDE + 8 + c), "loc1 color v=" + i + " c=" + c);
+            }
+        }
+        MemoryUtilities.memFree(owned);
+    }
+
+    @Test
+    void multiDrawSameFormat_mergesIntoSingleBatch() {
+        final int vbo = defaultQuadVbo();
+        final int eboA = uploadEbo(GL11.GL_UNSIGNED_SHORT, 0, 1, 2);
+        final int eboB = uploadEbo(GL11.GL_UNSIGNED_SHORT, 2, 3, 0);
+        final int vao = setupPosColorVao(vbo);
+
+        final int list = newList();
+        GLStateManager.glNewList(list, GL11.GL_COMPILE);
+        GLStateManager.glBindVertexArray(vao);
+        GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, eboA);
+        GLStateManager.glDrawElements(GL11.GL_TRIANGLES, 3, GL11.GL_UNSIGNED_SHORT, 0L);
+        GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, eboB);
+        GLStateManager.glDrawElements(GL11.GL_TRIANGLES, 3, GL11.GL_UNSIGNED_SHORT, 0L);
+        GLStateManager.glBindVertexArray(0);
+        GLStateManager.glEndList();
+
+        final List<BatchedIndexedDrawCmd> cmds = allBatchedCmds(list);
+        assertEquals(2, cmds.size(), "two indexed draws → two batched commands");
+        final List<IndexedDrawBatch> batches = batchesOf(list);
+        assertEquals(1, batches.size(), "same layout → one shared batch");
+
+        assertEquals(cmds.get(0).getSharedVAO(), cmds.get(1).getSharedVAO(), "shared VAO across draws in the same batch");
+        assertEquals(batches.getFirst().getSharedVAO(), cmds.get(0).getSharedVAO());
+
+        assertEquals(0L, cmds.get(0).getIndexByteOffset());
+        assertEquals(3 * 4L, cmds.get(1).getIndexByteOffset(), "second draw offset = first.indexCount * sizeof(UINT)");
+
+        // Shared EBO holds concatenated + rebased UINT indices. First draw minVtx=0 → [0,1,2];
+        // second draw minVtx=0, vertexBase=3 → [2+3, 3+3, 0+3] = [5, 6, 3].
+        final ByteBuffer ib = readBufferBytes(GL15.GL_ELEMENT_ARRAY_BUFFER, batches.getFirst().getSharedEBO(), 6 * 4);
+        assertUintIndices(ib, 0, 1, 2, 5, 6, 3);
+        MemoryUtilities.memFree(ib);
+    }
+
+    @Test
+    void multiDrawDifferentFormats_splitBatches() {
+        // Draw A: pos+color (stride=12). Draw B: pos-only (stride=8). Different layout → two batches.
+        final int vboA = defaultQuadVbo();
+        final int vaoA = setupPosColorVao(vboA);
+
+        final int vboB = newBuffer();
+        final ByteBuffer bData = MemoryUtilities.memAlloc(4 * 8).order(ByteOrder.nativeOrder());
+        for (int i = 0; i < 4; i++) {
+            bData.putFloat(DEFAULT_QUAD_POSITIONS[i * 2]);
+            bData.putFloat(DEFAULT_QUAD_POSITIONS[i * 2 + 1]);
+        }
+        bData.flip();
+        GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, vboB);
+        GL15.glBufferData(GL15.GL_ARRAY_BUFFER, bData, GL15.GL_STATIC_DRAW);
+        GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);
+        MemoryUtilities.memFree(bData);
+
+        final int vaoB = newVao();
+        GLStateManager.glBindVertexArray(vaoB);
+        GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, vboB);
+        GLStateManager.glVertexAttribPointer(0, 2, GL11.GL_FLOAT, false, 8, 0);
+        GLStateManager.glEnableVertexAttribArray(0);
+        GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);
+        GLStateManager.glBindVertexArray(0);
+
+        final int ebo = uploadEbo(GL11.GL_UNSIGNED_SHORT, 0, 1, 2);
+
+        final int list = newList();
+        GLStateManager.glNewList(list, GL11.GL_COMPILE);
+        GLStateManager.glBindVertexArray(vaoA);
+        GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, ebo);
+        GLStateManager.glDrawElements(GL11.GL_TRIANGLES, 3, GL11.GL_UNSIGNED_SHORT, 0L);
+        GLStateManager.glBindVertexArray(vaoB);
+        GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, ebo);
+        GLStateManager.glDrawElements(GL11.GL_TRIANGLES, 3, GL11.GL_UNSIGNED_SHORT, 0L);
+        GLStateManager.glBindVertexArray(0);
+        GLStateManager.glEndList();
+
+        final List<BatchedIndexedDrawCmd> cmds = allBatchedCmds(list);
+        assertEquals(2, cmds.size());
+        assertEquals(2, batchesOf(list).size(), "incompatible layouts → two batches");
+        assertNotEquals(cmds.get(0).getSharedVAO(), cmds.get(1).getSharedVAO(), "VAOs from separate batches must be distinct");
+    }
+
+    @Test
+    void sameSizesDifferentLocations_splitIntoSeparateBatches() {
+        // Both VAOs: pos 2f + color 4ub (same sizes/types/normalized). Only the enabled
+        // location sets differ — VAO-A uses {0,1}, VAO-B uses {0,2}. If AttribLayoutKey
+        // forgot about locations they'd merge and VAO-B's color data would get wired to
+        // loc 1 instead of loc 2.
+        final int vbo = defaultQuadVbo();
+
+        final int vaoA = setupPosColorVao(vbo);
+
+        final int vaoB = newVao();
+        GLStateManager.glBindVertexArray(vaoB);
+        GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, vbo);
+        GLStateManager.glVertexAttribPointer(0, 2, GL11.GL_FLOAT, false, POS_COLOR_STRIDE, 0);
+        GLStateManager.glEnableVertexAttribArray(0);
+        GLStateManager.glVertexAttribPointer(2, 4, GL11.GL_UNSIGNED_BYTE, true, POS_COLOR_STRIDE, 8);
+        GLStateManager.glEnableVertexAttribArray(2);
+        GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);
+        GLStateManager.glBindVertexArray(0);
+
+        final int ebo = uploadEbo(GL11.GL_UNSIGNED_SHORT, 0, 1, 2);
+
+        final int list = newList();
+        GLStateManager.glNewList(list, GL11.GL_COMPILE);
+        GLStateManager.glBindVertexArray(vaoA);
+        GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, ebo);
+        GLStateManager.glDrawElements(GL11.GL_TRIANGLES, 3, GL11.GL_UNSIGNED_SHORT, 0L);
+        GLStateManager.glBindVertexArray(vaoB);
+        GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, ebo);
+        GLStateManager.glDrawElements(GL11.GL_TRIANGLES, 3, GL11.GL_UNSIGNED_SHORT, 0L);
+        GLStateManager.glBindVertexArray(0);
+        GLStateManager.glEndList();
+
+        final List<BatchedIndexedDrawCmd> cmds = allBatchedCmds(list);
+        assertEquals(2, cmds.size());
+        assertEquals(2, batchesOf(list).size(), "different enabled locations → two batches");
+        assertNotEquals(cmds.get(0).getSharedVAO(), cmds.get(1).getSharedVAO(), "VAOs from separate batches must be distinct");
+    }
+
+    @Test
+    void nullListProbeCompiles() {
+        assertNull(DisplayListManager.getDisplayList(0));
+    }
+
+    @Test
+    void multiLayoutDraws_emitInInsertionOrder() {
+        // Two distinct layouts. The builder uses a LinkedHashMap, so the first
+        // recorded layout must always be the first batch out.
+        final int vboA = defaultQuadVbo();
+        final int vaoA = setupPosColorVao(vboA);
+
+        final int vboB = newBuffer();
+        final ByteBuffer bData = MemoryUtilities.memAlloc(4 * 8).order(ByteOrder.nativeOrder());
+        for (int i = 0; i < 4; i++) {
+            bData.putFloat(DEFAULT_QUAD_POSITIONS[i * 2]);
+            bData.putFloat(DEFAULT_QUAD_POSITIONS[i * 2 + 1]);
+        }
+        bData.flip();
+        GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, vboB);
+        GL15.glBufferData(GL15.GL_ARRAY_BUFFER, bData, GL15.GL_STATIC_DRAW);
+        GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);
+        MemoryUtilities.memFree(bData);
+
+        final int vaoB = newVao();
+        GLStateManager.glBindVertexArray(vaoB);
+        GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, vboB);
+        GLStateManager.glVertexAttribPointer(0, 2, GL11.GL_FLOAT, false, 8, 0);
+        GLStateManager.glEnableVertexAttribArray(0);
+        GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);
+        GLStateManager.glBindVertexArray(0);
+
+        final int ebo = uploadEbo(GL11.GL_UNSIGNED_SHORT, 0, 1, 2);
+
+        // Record (A, B) and (B, A) as independent lists; each list's batch order
+        // must match its own recording order.
+        final int listAB = newList();
+        GLStateManager.glNewList(listAB, GL11.GL_COMPILE);
+        GLStateManager.glBindVertexArray(vaoA);
+        GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, ebo);
+        GLStateManager.glDrawElements(GL11.GL_TRIANGLES, 3, GL11.GL_UNSIGNED_SHORT, 0L);
+        GLStateManager.glBindVertexArray(vaoB);
+        GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, ebo);
+        GLStateManager.glDrawElements(GL11.GL_TRIANGLES, 3, GL11.GL_UNSIGNED_SHORT, 0L);
+        GLStateManager.glBindVertexArray(0);
+        GLStateManager.glEndList();
+
+        final int listBA = newList();
+        GLStateManager.glNewList(listBA, GL11.GL_COMPILE);
+        GLStateManager.glBindVertexArray(vaoB);
+        GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, ebo);
+        GLStateManager.glDrawElements(GL11.GL_TRIANGLES, 3, GL11.GL_UNSIGNED_SHORT, 0L);
+        GLStateManager.glBindVertexArray(vaoA);
+        GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, ebo);
+        GLStateManager.glDrawElements(GL11.GL_TRIANGLES, 3, GL11.GL_UNSIGNED_SHORT, 0L);
+        GLStateManager.glBindVertexArray(0);
+        GLStateManager.glEndList();
+
+        final List<BatchedIndexedDrawCmd> ab = allBatchedCmds(listAB);
+        final List<BatchedIndexedDrawCmd> ba = allBatchedCmds(listBA);
+        // Placeholders sit in command-stream order (A-first vs B-first).
+        // Batches must be ordered so that placeholder[0] points at batch[0].
+        assertEquals(ab.get(0).getSharedVAO(), batchesOf(listAB).get(0).getSharedVAO(),
+            "listAB: batch[0] must match the first-recorded layout");
+        assertEquals(ab.get(1).getSharedVAO(), batchesOf(listAB).get(1).getSharedVAO(),
+            "listAB: batch[1] must match the second-recorded layout");
+        assertEquals(ba.get(0).getSharedVAO(), batchesOf(listBA).get(0).getSharedVAO(),
+            "listBA: batch[0] must match the first-recorded layout");
+        assertEquals(ba.get(1).getSharedVAO(), batchesOf(listBA).get(1).getSharedVAO(),
+            "listBA: batch[1] must match the second-recorded layout");
+    }
+
+    // === local helpers ===
+
+    private static void assertUintIndices(ByteBuffer ib, int... expected) {
+        for (int i = 0; i < expected.length; i++) {
+            assertEquals(expected[i], ib.getInt(i * 4), "index[" + i + "]");
+        }
+    }
+}

glsm/src/test/java/com/gtnewhorizons/angelica/glsm/recording/IndexedDrawDeleteSafetyTest.java

@@ -0,0 +1,150 @@
+package com.gtnewhorizons.angelica.glsm.recording;
+
+import com.gtnewhorizons.angelica.glsm.GLStateManager;
+import com.gtnewhorizons.angelica.glsm.recording.commands.IndexedDrawBatch;
+import com.gtnewhorizons.angelica.glsm.recording.support.DisplayListTestFixture;
+import org.junit.jupiter.api.Test;
+import org.lwjgl.opengl.GL11;
+import org.lwjgl.opengl.GL15;
+import org.lwjgl.opengl.GL20;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class IndexedDrawDeleteSafetyTest extends DisplayListTestFixture {
+
+    @Test
+    void vaoEboMapSweep_clearsStaleEntryOnForeignVao() {
+        final int vbo = defaultQuadVbo();
+        final int ebo = uploadEbo(GL11.GL_UNSIGNED_SHORT, 0, 1, 2, 3);
+        final int vao = setupPosColorVao(vbo);
+        final int list = recordSingleIndexedDraw(vao, ebo, GL11.GL_QUADS, 4, GL11.GL_UNSIGNED_SHORT);
+
+        final IndexedDrawBatch batch = firstBatch(list);
+        final int sharedEbo = batch.getSharedEBO();
+
+        final int foreignVao = newVao();
+        GLStateManager.glBindVertexArray(foreignVao);
+        GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, sharedEbo);
+        GLStateManager.glBindVertexArray(0);
+
+        GLStateManager.glDeleteLists(list, 1);
+        untrackList(list);
+
+        GLStateManager.glBindVertexArray(foreignVao);
+        assertEquals(0, GLStateManager.getBoundEBO(), "vaoEboMap still references the freed sharedEBO — non-gen crash imminent");
+        GLStateManager.glBindVertexArray(0);
+    }
+
+    @Test
+    void bindBufferCycle_afterListDelete_isGlNoError() {
+        final int vbo = defaultQuadVbo();
+        final int ebo = uploadEbo(GL11.GL_UNSIGNED_SHORT, 0, 1, 2, 3);
+        final int vao = setupPosColorVao(vbo);
+        final int list = recordSingleIndexedDraw(vao, ebo, GL11.GL_QUADS, 4, GL11.GL_UNSIGNED_SHORT);
+
+        final int sharedEbo = firstBatch(list).getSharedEBO();
+        final int foreignVao = newVao();
+        GLStateManager.glBindVertexArray(foreignVao);
+        GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, sharedEbo);
+        GLStateManager.glBindVertexArray(0);
+
+        GLStateManager.glDeleteLists(list, 1);
+        untrackList(list);
+
+        GLStateManager.glBindVertexArray(foreignVao);
+        while (GL11.glGetError() != GL11.GL_NO_ERROR) {}
+        final int prevEbo = GLStateManager.getBoundEBO();
+        GL15.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, prevEbo);
+        final int err = GL11.glGetError();
+        assertEquals(GL11.GL_NO_ERROR, err, () -> "bindBuffer(prevEbo=" + prevEbo + ") hit GL 0x" + Integer.toHexString(err) + " — cache carried a freed id through a VAO rebind");
+        GLStateManager.glBindVertexArray(0);
+    }
+
+    @Test
+    void multipleVaos_sharingOneEbo_allClearedOnEboDelete() {
+        // Two VAOs, same EBO. Deleting the EBO must clear vaoEboMap for both,
+        // not just whichever VAO happens to be currently bound.
+        final int ebo = uploadEbo(GL11.GL_UNSIGNED_SHORT, 0, 1, 2, 3);
+        final int vaoA = newVao();
+        final int vaoB = newVao();
+
+        GLStateManager.glBindVertexArray(vaoA);
+        GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, ebo);
+        GLStateManager.glBindVertexArray(vaoB);
+        GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, ebo);
+        GLStateManager.glBindVertexArray(0);
+
+        GLStateManager.glDeleteBuffers(ebo);
+
+        GLStateManager.glBindVertexArray(vaoA);
+        assertEquals(0, GLStateManager.getBoundEBO(), "vaoA still references freed EBO");
+        GLStateManager.glBindVertexArray(vaoB);
+        assertEquals(0, GLStateManager.getBoundEBO(), "vaoB still references freed EBO");
+        GLStateManager.glBindVertexArray(0);
+    }
+
+    @Test
+    void glDeleteProgram_zero_isNoOpAndLeavesActiveProgram() {
+        final int prog = linkMinimalProgram();
+        while (GL11.glGetError() != GL11.GL_NO_ERROR) {}
+
+        GLStateManager.glUseProgram(prog);
+        assertEquals(prog, GLStateManager.getActiveProgram());
+
+        GLStateManager.glDeleteProgram(0);
+
+        assertEquals(prog, GLStateManager.getActiveProgram(), "glDeleteProgram(0) must be a silent no-op");
+
+        GLStateManager.glUseProgram(0);
+        GLStateManager.glDeleteProgram(prog);
+        while (GL11.glGetError() != GL11.GL_NO_ERROR) {}
+    }
+
+    @Test
+    void activeProgram_clearedOnDelete() {
+        final int prog = linkMinimalProgram();
+        while (GL11.glGetError() != GL11.GL_NO_ERROR) {}
+
+        GLStateManager.glUseProgram(prog);
+        assertEquals(prog, GLStateManager.getActiveProgram());
+
+        GLStateManager.glDeleteProgram(prog);
+
+        assertEquals(0, GLStateManager.getActiveProgram(), "activeProgram not cleared when the active program was deleted");
+
+        GLStateManager.glUseProgram(0);
+        while (GL11.glGetError() != GL11.GL_NO_ERROR) {}
+    }
+
+    private static int linkMinimalProgram() {
+        final int vert = GLStateManager.glCreateShader(GL20.GL_VERTEX_SHADER);
+        GLStateManager.glShaderSource(vert, MIN_VERT_SRC);
+        GLStateManager.glCompileShader(vert);
+        if (GL20.glGetShaderi(vert, GL20.GL_COMPILE_STATUS) == GL11.GL_FALSE) {
+            throw new AssertionError("vertex shader failed to compile: " + GL20.glGetShaderInfoLog(vert, 4096));
+        }
+
+        final int frag = GLStateManager.glCreateShader(GL20.GL_FRAGMENT_SHADER);
+        GLStateManager.glShaderSource(frag, MIN_FRAG_SRC);
+        GLStateManager.glCompileShader(frag);
+        if (GL20.glGetShaderi(frag, GL20.GL_COMPILE_STATUS) == GL11.GL_FALSE) {
+            throw new AssertionError("fragment shader failed to compile: " + GL20.glGetShaderInfoLog(frag, 4096));
+        }
+
+        final int prog = GLStateManager.glCreateProgram();
+        GLStateManager.glAttachShader(prog, vert);
+        GLStateManager.glAttachShader(prog, frag);
+        GLStateManager.glLinkProgram(prog);
+        if (GL20.glGetProgrami(prog, GL20.GL_LINK_STATUS) == GL11.GL_FALSE) {
+            throw new AssertionError("program failed to link: " + GL20.glGetProgramInfoLog(prog, 4096));
+        }
+        GLStateManager.glDetachShader(prog, vert);
+        GLStateManager.glDetachShader(prog, frag);
+        GLStateManager.glDeleteShader(vert);
+        GLStateManager.glDeleteShader(frag);
+        return prog;
+    }
+
+    private static final String MIN_VERT_SRC = "#version 330 core\nvoid main(){gl_Position=vec4(0.0);}";
+    private static final String MIN_FRAG_SRC = "#version 330 core\nout vec4 oC;void main(){oC=vec4(1.0);}";
+}

glsm/src/test/java/com/gtnewhorizons/angelica/glsm/recording/IndexedDrawReplayTest.java

@@ -0,0 +1,243 @@
+package com.gtnewhorizons.angelica.glsm.recording;
+
+import com.gtnewhorizon.gtnhlib.bytebuf.MemoryUtilities;
+import com.gtnewhorizons.angelica.glsm.GLStateManager;
+import com.gtnewhorizons.angelica.glsm.recording.commands.AttribLayoutKey;
+import com.gtnewhorizons.angelica.glsm.recording.commands.BatchedIndexedDrawCmd;
+import com.gtnewhorizons.angelica.glsm.recording.commands.IndexedDrawBatch;
+import com.gtnewhorizons.angelica.glsm.recording.commands.IndexedDrawBatchBuilder;
+import com.gtnewhorizons.angelica.glsm.recording.commands.IndexedDrawCapture;
+import com.gtnewhorizons.angelica.glsm.recording.support.DisplayListTestFixture;
+import org.junit.jupiter.api.Test;
+import org.lwjgl.opengl.GL11;
+import org.lwjgl.opengl.GL15;
+
+import java.nio.ByteBuffer;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+
+class IndexedDrawReplayTest extends DisplayListTestFixture {
+    @Test
+    void compileAndExecute_firesLiveAndBakes() {
+        // COMPILE_AND_EXECUTE must do two things: (1) run the draw immediately,
+        // (2) record a placeholder so the list can replay it later. A samples-passed
+        // query wrapping the record block confirms the live half; asserting the
+        // placeholder post-endList confirms the baked half.
+        final int vbo = defaultQuadVbo();
+        final int ebo = uploadEbo(GL11.GL_UNSIGNED_SHORT, 0, 1, 2, 2, 3, 0);
+        final int vao = setupPosColorVao(vbo);
+
+        GL11.glViewport(0, 0, 16, 16);
+        GL11.glDisable(GL11.GL_DEPTH_TEST);
+        GL11.glClear(GL11.GL_COLOR_BUFFER_BIT);
+        while (GL11.glGetError() != GL11.GL_NO_ERROR) {}
+
+        final int query = GL15.glGenQueries();
+        GL15.glBeginQuery(GL15.GL_SAMPLES_PASSED, query);
+
+        final int list = newList();
+        GLStateManager.glNewList(list, GL11.GL_COMPILE_AND_EXECUTE);
+        GLStateManager.glBindVertexArray(vao);
+        GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, ebo);
+        GLStateManager.glDrawElements(GL11.GL_TRIANGLES, 6, GL11.GL_UNSIGNED_SHORT, 0L);
+        GLStateManager.glBindVertexArray(0);
+        GLStateManager.glEndList();
+
+        GL15.glEndQuery(GL15.GL_SAMPLES_PASSED);
+        final int samples = GL15.glGetQueryObjecti(query, GL15.GL_QUERY_RESULT);
+        GL15.glDeleteQueries(query);
+
+        assertTrue(samples > 0, "COMPILE_AND_EXECUTE did not fire the live draw (samples=" + samples + ")");
+
+        final BatchedIndexedDrawCmd baked = firstBatchedCmd(list);
+        assertNotNull(baked, "COMPILE_AND_EXECUTE did not bake a placeholder");
+        assertEquals(6, baked.getIndexCount());
+    }
+
+    @Test
+    void sharedVaoRetainsItsEbo() {
+        final int vbo = defaultQuadVbo();
+        final int callerEbo = uploadEbo(GL11.GL_UNSIGNED_SHORT, 0, 1, 2, 3);
+        final int vao = setupPosColorVao(vbo);
+        final int list = recordSingleIndexedDraw(vao, callerEbo, GL11.GL_QUADS, 4, GL11.GL_UNSIGNED_SHORT);
+
+        final BatchedIndexedDrawCmd batched = firstBatchedCmd(list);
+        assertNotNull(batched);
+        final IndexedDrawBatch batch = firstBatch(list);
+
+        GLStateManager.glBindVertexArray(batched.getSharedVAO());
+        assertEquals(batch.getSharedEBO(), GLStateManager.getBoundEBO(),
+            "batched VAO's EBO binding corrupted");
+        GLStateManager.glBindVertexArray(0);
+    }
+
+    @Test
+    void replayAfterSourceMutationAndStateChange() {
+        final int vbo = defaultQuadVbo();
+        final int callerEbo = uploadEbo(GL11.GL_UNSIGNED_SHORT, 0, 1, 2, 2, 3, 0);
+        final int vao = setupPosColorVao(vbo);
+        final int list = recordSingleIndexedDraw(vao, callerEbo, GL11.GL_TRIANGLES, 6, GL11.GL_UNSIGNED_SHORT);
+
+        overwriteBufferWithGarbage(GL15.GL_ARRAY_BUFFER, vbo, 4 * POS_COLOR_STRIDE);
+        overwriteBufferWithGarbage(GL15.GL_ELEMENT_ARRAY_BUFFER, callerEbo, 6 * 2);
+
+        // Bind unrelated state so the baked command has to restore its own bindings.
+        final int distractorVao = newVao();
+        GLStateManager.glBindVertexArray(distractorVao);
+        GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, 0);
+
+        while (GL11.glGetError() != GL11.GL_NO_ERROR) {}
+
+        compiledOf(list).render();
+
+        final int err = GL11.glGetError();
+        assertEquals(GL11.GL_NO_ERROR, err,
+            () -> "replay produced GL error 0x" + Integer.toHexString(err));
+
+        GLStateManager.glBindVertexArray(0);
+    }
+
+    @Test
+    void replayThenDelete_thenBindBufferCycle_isGlNoError() {
+        final int vbo = defaultQuadVbo();
+        final int ebo = uploadEbo(GL11.GL_UNSIGNED_SHORT, 0, 1, 2, 3);
+        final int vao = setupPosColorVao(vbo);
+        final int list = recordSingleIndexedDraw(vao, ebo, GL11.GL_QUADS, 4, GL11.GL_UNSIGNED_SHORT);
+
+        compiledOf(list).render();
+
+
+        final int sharedEbo = firstBatch(list).getSharedEBO();
+        final int foreignVao = newVao();
+        GLStateManager.glBindVertexArray(foreignVao);
+        GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, sharedEbo);
+        GLStateManager.glBindVertexArray(0);
+
+        GLStateManager.glDeleteLists(list, 1);
+        untrackList(list);
+
+        GLStateManager.glBindVertexArray(foreignVao);
+        assertEquals(0, GLStateManager.getBoundEBO(), "batched EBO id survived list delete in vaoEboMap — non-gen crash imminent");
+        while (GL11.glGetError() != GL11.GL_NO_ERROR) {}
+        final int prevEbo = GLStateManager.getBoundEBO();
+        GL15.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, prevEbo);
+        final int err = GL11.glGetError();
+        assertEquals(GL11.GL_NO_ERROR, err, () -> "post-delete bindBuffer(" + prevEbo + ") hit GL 0x" + Integer.toHexString(err));
+        GLStateManager.glBindVertexArray(0);
+    }
+
+    @Test
+    void execute_doesNotRestoreVAO_backToBackDraws() {
+        final int vbo = defaultQuadVbo();
+        final int ebo = uploadEbo(GL11.GL_UNSIGNED_SHORT, 0, 1, 2, 3);
+        final int vao = setupPosColorVao(vbo);
+
+        final int list = newList();
+        GLStateManager.glNewList(list, GL11.GL_COMPILE);
+        GLStateManager.glBindVertexArray(vao);
+        GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, ebo);
+        GLStateManager.glDrawElements(GL11.GL_QUADS, 4, GL11.GL_UNSIGNED_SHORT, 0L);
+        GLStateManager.glDrawElements(GL11.GL_QUADS, 4, GL11.GL_UNSIGNED_SHORT, 0L);
+        GLStateManager.glEndList();
+
+        final List<BatchedIndexedDrawCmd> cmds = allBatchedCmds(list);
+        assertEquals(2, cmds.size());
+        final int sharedVAO = cmds.getFirst().getSharedVAO();
+        assertEquals(sharedVAO, cmds.get(1).getSharedVAO());
+
+        final int distractor = newVao();
+        GLStateManager.glBindVertexArray(distractor);
+        while (GL11.glGetError() != GL11.GL_NO_ERROR) {}
+
+        compiledOf(list).render();
+
+        assertEquals(sharedVAO, GLStateManager.getBoundVAO());
+        GLStateManager.glBindVertexArray(0);
+    }
+
+    @Test
+    void build_partialFailure_deletesEarlierBatchesAndLeavesPlaceholdersUnfilled() {
+        final int vbo = defaultQuadVbo();
+        final int ebo = uploadEbo(GL11.GL_UNSIGNED_SHORT, 0, 1, 2, 3);
+        final int vao = setupPosColorVao(vbo);
+        GLStateManager.glBindVertexArray(vao);
+        GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, ebo);
+
+        final IndexedDrawCapture good = IndexedDrawCapture.create(GL11.GL_QUADS, 4, GL11.GL_UNSIGNED_SHORT, 0L, ebo);
+        assertNotNull(good);
+
+        // Synthetic capture with a different layout that trips the >2GiB size guard.
+        final AttribLayoutKey otherLayout = new AttribLayoutKey(
+            new int[]{2}, new int[]{4}, new int[]{GL11.GL_FLOAT}, new boolean[]{false});
+        final ByteBuffer tinyVtx = MemoryUtilities.memAlloc(16);
+        final ByteBuffer tinyIdx = MemoryUtilities.memAlloc(16);
+        final IndexedDrawCapture huge = new IndexedDrawCapture(
+            otherLayout, GL11.GL_TRIANGLES,
+            Integer.MAX_VALUE / 4, 1, tinyVtx, tinyIdx,
+            new BatchedIndexedDrawCmd());
+
+        final IndexedDrawBatchBuilder builder = new IndexedDrawBatchBuilder();
+        builder.add(good);
+        builder.add(huge);
+
+        try {
+            assertThrows(IllegalStateException.class, builder::build);
+            assertEquals(0, good.placeholder.getSharedVAO());
+            assertEquals(0, huge.placeholder.getSharedVAO());
+        } finally {
+            MemoryUtilities.memFree(tinyVtx);
+            MemoryUtilities.memFree(tinyIdx);
+            good.freeBuffers();
+            GLStateManager.glBindVertexArray(0);
+        }
+    }
+
+    @Test
+    void recorderFree_releasesUnfilledCaptureNativeBuffers() {
+        final CommandRecorder rec = new CommandRecorder();
+        final ByteBuffer vtx = MemoryUtilities.memAlloc(64);
+        final ByteBuffer idx = MemoryUtilities.memAlloc(32);
+        final IndexedDrawCapture cap = new IndexedDrawCapture(
+            new AttribLayoutKey(new int[]{0}, new int[]{2}, new int[]{GL11.GL_FLOAT}, new boolean[]{false}),
+            GL11.GL_TRIANGLES, 4, 6, vtx, idx, new BatchedIndexedDrawCmd());
+
+        rec.recordIndexedDrawCapture(cap);
+        assertFalse(cap.isFreed());
+
+        rec.free();
+
+        assertTrue(cap.isFreed());
+        cap.freeBuffers();
+    }
+
+    @Test
+    void execute_idempotentReplay_doesNotErrorOnSecondPass() {
+        final int vbo = defaultQuadVbo();
+        final int ebo = uploadEbo(GL11.GL_UNSIGNED_SHORT, 0, 1, 2, 3);
+        final int vao = setupPosColorVao(vbo);
+
+        final int list = newList();
+        GLStateManager.glNewList(list, GL11.GL_COMPILE);
+        GLStateManager.glBindVertexArray(vao);
+        GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, ebo);
+        GLStateManager.glDrawElements(GL11.GL_QUADS, 4, GL11.GL_UNSIGNED_SHORT, 0L);
+        GLStateManager.glEndList();
+
+        while (GL11.glGetError() != GL11.GL_NO_ERROR) {}
+
+        compiledOf(list).render();
+        compiledOf(list).render();
+
+        final int err = GL11.glGetError();
+        assertEquals(GL11.GL_NO_ERROR, err,
+            () -> "double replay produced GL error 0x" + Integer.toHexString(err));
+
+        GLStateManager.glBindVertexArray(0);
+    }
+}

glsm/src/test/java/com/gtnewhorizons/angelica/glsm/recording/commands/AttribLayoutKeyTest.java

@@ -0,0 +1,95 @@
+package com.gtnewhorizons.angelica.glsm.recording.commands;
+
+import org.junit.jupiter.api.Test;
+import org.lwjgl.opengl.GL11;
+
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+
+class AttribLayoutKeyTest {
+
+    private static int[] offsetsOf(AttribLayoutKey k) {
+        final int[] out = new int[k.locations.length];
+        for (int i = 0; i < out.length; i++) out[i] = k.offset(i);
+        return out;
+    }
+
+    @Test
+    void standardPosColorUvNormal_isAlignedAndPacked() {
+        final AttribLayoutKey k = new AttribLayoutKey(
+            new int[]{0, 1, 2, 4},
+            new int[]{3, 4, 2, 3},
+            new int[]{GL11.GL_FLOAT, GL11.GL_UNSIGNED_BYTE, GL11.GL_FLOAT, GL11.GL_BYTE},
+            new boolean[]{false, true, false, true});
+        assertArrayEquals(new int[]{0, 12, 16, 24}, offsetsOf(k));
+        assertEquals(28, k.stride());
+    }
+
+    @Test
+    void posUvNormal3_roundsTailStrideTo24() {
+        final AttribLayoutKey k = new AttribLayoutKey(
+            new int[]{0, 2, 4},
+            new int[]{3, 2, 3},
+            new int[]{GL11.GL_FLOAT, GL11.GL_FLOAT, GL11.GL_BYTE},
+            new boolean[]{false, false, true});
+        assertArrayEquals(new int[]{0, 12, 20}, offsetsOf(k));
+        assertEquals(24, k.stride());
+    }
+
+    @Test
+    void interiorHazardOrder_roundsMidAttribOffset() {
+        final AttribLayoutKey k = new AttribLayoutKey(
+            new int[]{0, 4, 2},
+            new int[]{3, 3, 2},
+            new int[]{GL11.GL_FLOAT, GL11.GL_BYTE, GL11.GL_FLOAT},
+            new boolean[]{false, true, false});
+        assertArrayEquals(new int[]{0, 12, 16}, offsetsOf(k));
+        assertEquals(24, k.stride());
+    }
+
+    @Test
+    void allByteLayout_packsTight() {
+        final AttribLayoutKey k = new AttribLayoutKey(
+            new int[]{0, 1, 2},
+            new int[]{3, 4, 2},
+            new int[]{GL11.GL_BYTE, GL11.GL_UNSIGNED_BYTE, GL11.GL_BYTE},
+            new boolean[]{true, true, false});
+        assertArrayEquals(new int[]{0, 3, 7}, offsetsOf(k));
+        assertEquals(9, k.stride());
+    }
+
+    @Test
+    void shortsFollowingByte_roundToEvenAndStrideToEven() {
+        final AttribLayoutKey k = new AttribLayoutKey(
+            new int[]{0, 1},
+            new int[]{1, 2},
+            new int[]{GL11.GL_BYTE, GL11.GL_SHORT},
+            new boolean[]{true, false});
+        assertArrayEquals(new int[]{0, 2}, offsetsOf(k));
+        assertEquals(6, k.stride());
+    }
+
+    @Test
+    void equalInputs_produceEqualKeys() {
+        final AttribLayoutKey a = new AttribLayoutKey(
+            new int[]{0, 2}, new int[]{3, 2},
+            new int[]{GL11.GL_FLOAT, GL11.GL_FLOAT}, new boolean[]{false, false});
+        final AttribLayoutKey b = new AttribLayoutKey(
+            new int[]{0, 2}, new int[]{3, 2},
+            new int[]{GL11.GL_FLOAT, GL11.GL_FLOAT}, new boolean[]{false, false});
+        assertEquals(a, b);
+        assertEquals(a.hashCode(), b.hashCode());
+        assertEquals(a.stride(), b.stride());
+        assertArrayEquals(offsetsOf(a), offsetsOf(b));
+    }
+
+    @Test
+    void differentNormalized_producesDifferentKeys() {
+        final AttribLayoutKey a = new AttribLayoutKey(
+            new int[]{0}, new int[]{4}, new int[]{GL11.GL_UNSIGNED_BYTE}, new boolean[]{true});
+        final AttribLayoutKey b = new AttribLayoutKey(
+            new int[]{0}, new int[]{4}, new int[]{GL11.GL_UNSIGNED_BYTE}, new boolean[]{false});
+        assertNotEquals(a, b);
+    }
+}

glsm/src/test/java/com/gtnewhorizons/angelica/glsm/recording/support/DisplayListTestFixture.java

@@ -0,0 +1,205 @@
+package com.gtnewhorizons.angelica.glsm.recording.support;
+
+import com.gtnewhorizon.gtnhlib.bytebuf.MemoryUtilities;
+import com.gtnewhorizons.angelica.glsm.DisplayListManager;
+import com.gtnewhorizons.angelica.glsm.GLSMExtension;
+import com.gtnewhorizons.angelica.glsm.GLStateManager;
+import com.gtnewhorizons.angelica.glsm.recording.CompiledDisplayList;
+import com.gtnewhorizons.angelica.glsm.recording.commands.BatchedIndexedDrawCmd;
+import com.gtnewhorizons.angelica.glsm.recording.commands.IndexedDrawBatch;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.lwjgl.opengl.GL11;
+import org.lwjgl.opengl.GL15;
+import org.lwjgl.opengl.GL30;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+@ExtendWith(GLSMExtension.class)
+public abstract class DisplayListTestFixture {
+
+    public static final float[] DEFAULT_QUAD_POSITIONS = {0f, 0f, 1f, 0f, 1f, 1f, 0f, 1f};
+    public static final byte[][] DEFAULT_SOLID_COLORS = {
+        {1, 1, 1, 1}, {2, 2, 2, 2}, {3, 3, 3, 3}, {4, 4, 4, 4}
+    };
+
+    public static final int POS_COLOR_STRIDE = 12;
+
+    private final List<Integer> listsToCleanup = new ArrayList<>();
+    private final List<Integer> buffersToCleanup = new ArrayList<>();
+    private final List<Integer> vaosToCleanup = new ArrayList<>();
+
+    @AfterEach
+    void cleanupFixtureResources() {
+        for (int list : listsToCleanup) GLStateManager.glDeleteLists(list, 1);
+        for (int buf : buffersToCleanup) {
+            if (GL15.glIsBuffer(buf)) GL15.glDeleteBuffers(buf);
+        }
+        for (int vao : vaosToCleanup) {
+            if (GL30.glIsVertexArray(vao)) GLStateManager.glDeleteVertexArrays(vao);
+        }
+        listsToCleanup.clear();
+        buffersToCleanup.clear();
+        vaosToCleanup.clear();
+    }
+
+    protected final int newList() {
+        final int id = GL11.glGenLists(1);
+        listsToCleanup.add(id);
+        return id;
+    }
+
+    protected final void untrackList(int list) {
+        listsToCleanup.remove((Integer) list);
+    }
+
+    protected final int newBuffer() {
+        final int id = GL15.glGenBuffers();
+        buffersToCleanup.add(id);
+        return id;
+    }
+
+    protected final int newVao() {
+        final int id = GL30.glGenVertexArrays();
+        vaosToCleanup.add(id);
+        return id;
+    }
+
+    /** 2 floats pos + 4 bytes color, stride 12, one vertex per entry in {@code colors}. */
+    protected final int uploadPosColorVbo(float[] positions, byte[][] colors) {
+        if (positions.length / 2 != colors.length) {
+            throw new IllegalArgumentException("positions/colors length mismatch");
+        }
+        final int n = colors.length;
+        final int vbo = newBuffer();
+        final ByteBuffer data = MemoryUtilities.memAlloc(n * POS_COLOR_STRIDE).order(ByteOrder.nativeOrder());
+        for (int i = 0; i < n; i++) {
+            data.putFloat(positions[i * 2]);
+            data.putFloat(positions[i * 2 + 1]);
+            data.put(colors[i][0]);
+            data.put(colors[i][1]);
+            data.put(colors[i][2]);
+            data.put(colors[i][3]);
+        }
+        data.flip();
+        GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, vbo);
+        GL15.glBufferData(GL15.GL_ARRAY_BUFFER, data, GL15.GL_STATIC_DRAW);
+        GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);
+        MemoryUtilities.memFree(data);
+        return vbo;
+    }
+
+    /** Pos+color VBO populated with {@link #DEFAULT_QUAD_POSITIONS} / {@link #DEFAULT_SOLID_COLORS}. */
+    protected final int defaultQuadVbo() {
+        return uploadPosColorVbo(DEFAULT_QUAD_POSITIONS, DEFAULT_SOLID_COLORS);
+    }
+
+    protected final int uploadEbo(int indexType, int... values) {
+        final int bytesPer = switch (indexType) {
+            case GL11.GL_UNSIGNED_BYTE -> 1;
+            case GL11.GL_UNSIGNED_SHORT -> 2;
+            case GL11.GL_UNSIGNED_INT -> 4;
+            default -> throw new IllegalArgumentException("unsupported indexType 0x" + Integer.toHexString(indexType));
+        };
+        final int ebo = newBuffer();
+        final ByteBuffer data = MemoryUtilities.memAlloc(values.length * bytesPer).order(ByteOrder.nativeOrder());
+        for (int v : values) {
+            switch (indexType) {
+                case GL11.GL_UNSIGNED_BYTE -> data.put((byte) v);
+                case GL11.GL_UNSIGNED_SHORT -> data.putShort((short) v);
+                case GL11.GL_UNSIGNED_INT -> data.putInt(v);
+            }
+        }
+        data.flip();
+        GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, ebo);
+        GL15.glBufferData(GL15.GL_ELEMENT_ARRAY_BUFFER, data, GL15.GL_STATIC_DRAW);
+        GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, 0);
+        MemoryUtilities.memFree(data);
+        return ebo;
+    }
+
+    /** VAO with loc0 = 2*FLOAT pos, loc1 = 4*UNSIGNED_BYTE norm color, stride 12. */
+    protected final int setupPosColorVao(int vbo) {
+        final int vao = newVao();
+        GLStateManager.glBindVertexArray(vao);
+        GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, vbo);
+        GLStateManager.glVertexAttribPointer(0, 2, GL11.GL_FLOAT, false, POS_COLOR_STRIDE, 0);
+        GLStateManager.glEnableVertexAttribArray(0);
+        GLStateManager.glVertexAttribPointer(1, 4, GL11.GL_UNSIGNED_BYTE, true, POS_COLOR_STRIDE, 8);
+        GLStateManager.glEnableVertexAttribArray(1);
+        GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);
+        GLStateManager.glBindVertexArray(0);
+        return vao;
+    }
+
+    /**
+     * Record one {@code glDrawElements} into a {@code GL_COMPILE} list with the given VAO and EBO
+     * already-bound setup. Returns the list id (tracked for cleanup).
+     */
+    protected final int recordSingleIndexedDraw(int vao, int ebo, int drawMode, int indexCount, int indexType) {
+        final int list = newList();
+        GLStateManager.glNewList(list, GL11.GL_COMPILE);
+        GLStateManager.glBindVertexArray(vao);
+        GLStateManager.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, ebo);
+        GLStateManager.glDrawElements(drawMode, indexCount, indexType, 0L);
+        GLStateManager.glBindVertexArray(0);
+        GLStateManager.glEndList();
+        return list;
+    }
+
+    protected static CompiledDisplayList compiledOf(int listId) {
+        final CompiledDisplayList compiled = DisplayListManager.getDisplayList(listId);
+        assertNotNull(compiled, "compiled display list must exist for id " + listId);
+        return compiled;
+    }
+
+    protected static List<BatchedIndexedDrawCmd> allBatchedCmds(int listId) {
+        final List<BatchedIndexedDrawCmd> out = new ArrayList<>();
+        final Object[] complex = compiledOf(listId).getComplexObjects();
+        if (complex == null) return out;
+        for (Object o : complex) {
+            if (o instanceof BatchedIndexedDrawCmd b) out.add(b);
+        }
+        return out;
+    }
+
+    protected static BatchedIndexedDrawCmd firstBatchedCmd(int listId) {
+        final List<BatchedIndexedDrawCmd> cmds = allBatchedCmds(listId);
+        return cmds.isEmpty() ? null : cmds.getFirst();
+    }
+
+    protected static List<IndexedDrawBatch> batchesOf(int listId) {
+        return compiledOf(listId).getIndexedBatches();
+    }
+
+    protected static IndexedDrawBatch firstBatch(int listId) {
+        return batchesOf(listId).getFirst();
+    }
+
+    protected static ByteBuffer readBufferBytes(int target, int bufferId, int size) {
+        final int prev;
+        if (target == GL15.GL_ARRAY_BUFFER) prev = GLStateManager.getBoundVBO();
+        else if (target == GL15.GL_ELEMENT_ARRAY_BUFFER) prev = GLStateManager.getBoundEBO();
+        else prev = 0;
+
+        GLStateManager.glBindBuffer(target, bufferId);
+        final ByteBuffer buf = MemoryUtilities.memAlloc(size).order(ByteOrder.nativeOrder());
+        GL15.glGetBufferSubData(target, 0, buf);
+        GLStateManager.glBindBuffer(target, prev);
+        return buf;
+    }
+
+    protected static void overwriteBufferWithGarbage(int target, int bufferId, int size) {
+        final ByteBuffer garbage = MemoryUtilities.memAlloc(size);
+        for (int i = 0; i < garbage.capacity(); i++) garbage.put(i, (byte) 0xAA);
+        GLStateManager.glBindBuffer(target, bufferId);
+        GL15.glBufferData(target, garbage, GL15.GL_STATIC_DRAW);
+        GLStateManager.glBindBuffer(target, 0);
+        MemoryUtilities.memFree(garbage);
+    }
+}

glsm/src/test/java/com/gtnewhorizons/angelica/glsm/redirect/GLSMRedirectorTest.java

@@ -0,0 +1,142 @@
+package com.gtnewhorizons.angelica.glsm.redirect;
+
+import org.junit.jupiter.api.Test;
+import org.objectweb.asm.ClassWriter;
+import org.objectweb.asm.Handle;
+import org.objectweb.asm.Opcodes;
+import org.objectweb.asm.Type;
+import org.objectweb.asm.tree.ClassNode;
+import org.objectweb.asm.tree.InsnNode;
+import org.objectweb.asm.tree.InvokeDynamicInsnNode;
+import org.objectweb.asm.tree.MethodNode;
+
+import java.util.ArrayList;
+
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class GLSMRedirectorTest {
+
+    private static final String GLSM = GLSMRedirector.getTargetClassName();
+
+    private static final Handle LAMBDA_METAFACTORY = new Handle(
+            Opcodes.H_INVOKESTATIC,
+            "java/lang/invoke/LambdaMetafactory",
+            "metafactory",
+            "(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;"
+                    + "Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)"
+                    + "Ljava/lang/invoke/CallSite;",
+            false);
+
+    private static ClassNode makeClassWithInvokeDynamic(Handle implHandle) {
+        final ClassNode cn = new ClassNode();
+        cn.version = Opcodes.V1_8;
+        cn.access = Opcodes.ACC_PUBLIC;
+        cn.name = "com/example/TestClass";
+        cn.superName = "java/lang/Object";
+        cn.methods = new ArrayList<>();
+
+        final MethodNode mn = new MethodNode(Opcodes.ACC_PUBLIC | Opcodes.ACC_STATIC, "test", "()V", null, null);
+        mn.instructions.add(new InvokeDynamicInsnNode(
+                "run",
+                "()Ljava/lang/Runnable;",
+                LAMBDA_METAFACTORY,
+                Type.getType("()V"),
+                implHandle,
+                Type.getType("()V")));
+        mn.instructions.add(new InsnNode(Opcodes.RETURN));
+        cn.methods.add(mn);
+
+        return cn;
+    }
+
+    private static Handle getResultHandle(ClassNode cn) {
+        final InvokeDynamicInsnNode dyn = (InvokeDynamicInsnNode) cn.methods.get(0).instructions.get(0);
+        return (Handle) dyn.bsmArgs[1];
+    }
+
+    @Test
+    void invokeDynamicGL11HandleIsRedirected() {
+        final Handle impl = new Handle(Opcodes.H_INVOKESTATIC, "org/lwjgl/opengl/GL11", "glPopMatrix", "()V", false);
+        final ClassNode cn = makeClassWithInvokeDynamic(impl);
+
+        final boolean changed = new GLSMRedirector().transformClassNode("com.example.TestClass", cn);
+
+        assertTrue(changed);
+        final Handle result = getResultHandle(cn);
+        assertEquals(GLSM, result.getOwner());
+        assertEquals("glPopMatrix", result.getName());
+        assertEquals("()V", result.getDesc());
+        assertEquals(Opcodes.H_INVOKESTATIC, result.getTag());
+    }
+
+    @Test
+    void invokeDynamicNamedClassHandleIsRedirected() {
+        final Handle impl = new Handle(Opcodes.H_INVOKESTATIC, "org/lwjgl/opengl/EXTBlendFuncSeparate", "glBlendFuncSeparateEXT", "(IIII)V", false);
+        final ClassNode cn = makeClassWithInvokeDynamic(impl);
+
+        final boolean changed = new GLSMRedirector().transformClassNode("com.example.TestClass", cn);
+
+        assertTrue(changed);
+        final Handle result = getResultHandle(cn);
+        assertEquals(GLSM, result.getOwner());
+        assertEquals("tryBlendFuncSeparate", result.getName());
+        assertEquals("(IIII)V", result.getDesc());
+    }
+
+    @Test
+    void invokeDynamicNonGLHandleIsNotTouched() {
+        final Handle impl = new Handle(Opcodes.H_INVOKESTATIC, "java/lang/System", "currentTimeMillis", "()J", false);
+        final ClassNode cn = makeClassWithInvokeDynamic(impl);
+
+        final boolean changed = new GLSMRedirector().transformClassNode("com.example.TestClass", cn);
+
+        assertFalse(changed);
+        final Handle result = getResultHandle(cn);
+        assertEquals("java/lang/System", result.getOwner());
+        assertEquals("currentTimeMillis", result.getName());
+    }
+
+    @Test
+    void invokeDynamicUnknownGLMethodIsNotTouched() {
+        final Handle impl = new Handle(Opcodes.H_INVOKESTATIC, "org/lwjgl/opengl/GL11", "glNonexistent", "()V", false);
+        final ClassNode cn = makeClassWithInvokeDynamic(impl);
+
+        final boolean changed = new GLSMRedirector().transformClassNode("com.example.TestClass", cn);
+
+        assertFalse(changed);
+        final Handle result = getResultHandle(cn);
+        assertEquals("org/lwjgl/opengl/GL11", result.getOwner());
+    }
+
+    @Test
+    void invokeDynamicGLCVariantIsRedirected() {
+        final Handle impl = new Handle(Opcodes.H_INVOKESTATIC, "org/lwjgl/opengl/GL11C", "glDrawArrays", "(III)V", false);
+        final ClassNode cn = makeClassWithInvokeDynamic(impl);
+
+        final boolean changed = new GLSMRedirector().transformClassNode("com.example.TestClass", cn);
+
+        assertTrue(changed);
+        final Handle result = getResultHandle(cn);
+        assertEquals(GLSM, result.getOwner());
+        assertEquals("glDrawArrays", result.getName());
+        assertEquals("(III)V", result.getDesc());
+    }
+
+    @Test
+    void transformedClassProducesValidBytecode() {
+        final Handle impl = new Handle(Opcodes.H_INVOKESTATIC, "org/lwjgl/opengl/GL11", "glPopMatrix", "()V", false);
+        final ClassNode cn = makeClassWithInvokeDynamic(impl);
+
+        new GLSMRedirector().transformClassNode("com.example.TestClass", cn);
+
+        final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
+        assertDoesNotThrow(() -> {
+            cn.accept(cw);
+            final byte[] bytes = cw.toByteArray();
+            assertTrue(bytes.length > 0);
+        });
+    }
+}

lwjgl3-backend/src/main/java/com/gtnewhorizons/angelica/lwjgl3/Lwjgl3GLRenderBackend.java

@@ -68,6 +68,16 @@ public final class Lwjgl3GLRenderBackend extends RenderBackend {
         return "OpenGL (LWJGL3)";
     }
 
+    @Override
+    public boolean hasContext() {
+        try {
+            GL.getCapabilities();
+            return true;
+        } catch (IllegalStateException e) {
+            return false;
+        }
+    }
+
     @Override
     public int getPriority() { return 50; }
 

src/main/java/com/gtnewhorizons/angelica/AngelicaMod.java

@@ -1,17 +1,11 @@
 package com.gtnewhorizons.angelica;
 
-import com.gtnewhorizons.angelica.common.BlockError;
-import com.gtnewhorizons.angelica.compat.ModStatus;
-import com.gtnewhorizons.angelica.config.ConfigMigrator;
 import com.gtnewhorizons.angelica.proxy.CommonProxy;
-import com.gtnewhorizons.angelica.utils.AnimationMode;
-import com.gtnewhorizons.angelica.utils.ManagedEnum;
 import cpw.mods.fml.common.Mod;
 import cpw.mods.fml.common.SidedProxy;
 import cpw.mods.fml.common.event.FMLInitializationEvent;
 import cpw.mods.fml.common.event.FMLPostInitializationEvent;
 import cpw.mods.fml.common.event.FMLPreInitializationEvent;
-import me.jellysquid.mods.sodium.client.gui.SodiumGameOptions;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
@@ -32,32 +26,19 @@ import static com.gtnewhorizons.angelica.AngelicaMod.MOD_ID;
         acceptableRemoteVersions = "*",
         guiFactory = "com.gtnewhorizons.angelica.config.AngelicaGuiConfigFactory")
 public class AngelicaMod {
+
     public static final String MOD_ID = "angelica";
     public static final Logger LOGGER = LogManager.getLogger("Angelica");
+    public static final boolean lwjglDebug = Boolean.getBoolean("org.lwjgl.util.Debug");
 
-    private static SodiumGameOptions CONFIG;
-
-    public static SodiumGameOptions options() {
-        if (CONFIG == null) {
-            CONFIG = SodiumGameOptions.load(ConfigMigrator.handleConfigMigration("angelica-options.json"));
-        }
-        return CONFIG;
-    }
-
-    @SidedProxy(clientSide = "com.gtnewhorizons.angelica.proxy.ClientProxy", serverSide = "com.gtnewhorizons.angelica.proxy.CommonProxy")
+    @SidedProxy(
+        clientSide = "com.gtnewhorizons.angelica.proxy.ClientProxy",
+        serverSide = "com.gtnewhorizons.angelica.proxy.CommonProxy")
     public static CommonProxy proxy;
 
-    public static final boolean lwjglDebug = Boolean.parseBoolean(System.getProperty("org.lwjgl.util.Debug", "false"));
-
-    public static final ManagedEnum<AnimationMode> animationsMode = new ManagedEnum<>(AnimationMode.VISIBLE_ONLY);
-
-    public static BlockError blockError;
-
     @Mod.EventHandler
     public void preInit(FMLPreInitializationEvent event) {
-        ModStatus.preInit();
         proxy.preInit(event);
-        blockError = new BlockError();
     }
 
     @Mod.EventHandler

src/main/java/com/gtnewhorizons/angelica/api/GLRedirects.java

@@ -0,0 +1,118 @@
+package com.gtnewhorizons.angelica.api;
+
+import com.gtnewhorizons.angelica.glsm.redirect.GLSMRedirector;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.TreeSet;
+import java.util.regex.Pattern;
+
+/**
+ * Public API for querying Angelica's GL call redirections.
+ * <p>
+ * Angelica's bytecode transformer redirects GL calls (e.g., {@code GL11.glPushMatrix()}) to
+ * {@link com.gtnewhorizons.angelica.glsm.GLStateManager GLStateManager} for state tracking and
+ * core profile compatibility. This works for normal Java bytecode loaded through the Forge classloader,
+ * but callers that bypass class transformation (e.g., Nashorn/script engines, reflection, MethodHandles)
+ * need to perform their own redirection.
+ * <p>
+ * This class provides the redirect mapping data and a precompiled regex pattern for transforming
+ * script source text before evaluation.
+ *
+ * <h3>Example: transforming a Nashorn script before eval</h3>
+ * Given a script that uses {@code importPackage(Packages.org.lwjgl.opengl)} and calls
+ * {@code GL11.glPushMatrix()}, the text transformation rewrites those calls before evaluation:
+ * <pre>{@code
+ * // Make GLStateManager available to the script -- either via importPackage:
+ * script = "importPackage(Packages.com.gtnewhorizons.angelica.glsm);\n" + script;
+ * // ... or via Java.type for an explicit binding:
+ * // script = "var GLStateManager = Java.type('" + GLRedirects.TARGET_CLASS + "');\n" + script;
+ *
+ * // Rewrite: GL11.glPushMatrix() -> GLStateManager.glPushMatrix()
+ * script = GLRedirects.getMethodRedirectPattern().matcher(script).replaceAll(mr -> {
+ *     String target = GLRedirects.getTargetMethodName(mr.group(0));
+ *     return target != null ? "GLStateManager." + target : mr.group(0);
+ * });
+ *
+ * engine.eval(script);
+ * }</pre>
+ */
+public final class GLRedirects {
+    /** Fully qualified name of the GLStateManager class that all methods redirect to. */
+    @SuppressWarnings("unused")
+    public static final String TARGET_CLASS = "com.gtnewhorizons.angelica.glsm.GLStateManager";
+
+    private static final String SHORT_GL_PREFIX;
+    private static final Map<String, Map<String, String>> NAMED_CLASS_SHORT_NAME_MAP;
+    private static final Map<String, String> GL_PREFIX_METHOD_REDIRECTS;
+    private static final Pattern METHOD_REDIRECT_PATTERN;
+
+    static {
+        SHORT_GL_PREFIX = buildShortGLPrefix();
+        NAMED_CLASS_SHORT_NAME_MAP = buildNamedClassShortNameMap();
+        GL_PREFIX_METHOD_REDIRECTS = GLSMRedirector.getGLPrefixMethodRedirects();
+        METHOD_REDIRECT_PATTERN = buildMethodRedirectPattern();
+    }
+
+    private GLRedirects() {}
+
+    /**
+     * Returns a precompiled pattern that matches redirected {@code ClassName.methodName} references
+     * using short (simple) class names, as they might typically appear in script text.
+     *
+     * @return compiled regex pattern
+     */
+    public static Pattern getMethodRedirectPattern() {
+        return METHOD_REDIRECT_PATTERN;
+    }
+
+    /**
+     * Looks up the GLStateManager target method name for a short-name reference.
+     *
+     * @param classAndMethod short class name and method, e.g., {@code "GL11.glPushMatrix"}
+     * @return the target method name on GLStateManager (e.g., {@code "glPushMatrix"}), or {@code null} if this reference is not redirected
+     */
+    public static String getTargetMethodName(String classAndMethod) {
+        final int dot = classAndMethod.indexOf('.');
+        if (dot < 0) return null;
+
+        final String className = classAndMethod.substring(0, dot);
+        final String methodName = classAndMethod.substring(dot + 1);
+
+        final Map<String, String> classRedirects = NAMED_CLASS_SHORT_NAME_MAP.get(className);
+        if (classRedirects != null) {
+            return classRedirects.get(methodName);
+        }
+
+        if (className.startsWith(SHORT_GL_PREFIX)) {
+            return GL_PREFIX_METHOD_REDIRECTS.get(methodName);
+        }
+
+        return null;
+    }
+
+    private static String buildShortGLPrefix() {
+        final String glPrefix = GLSMRedirector.getGLPrefix();
+        return glPrefix.substring(glPrefix.lastIndexOf('/') + 1);
+    }
+
+    private static Map<String, Map<String, String>> buildNamedClassShortNameMap() {
+        final Map<String, Map<String, String>> named = new HashMap<>();
+        for (final var entry : GLSMRedirector.getNamedClassMethodRedirects().entrySet()) {
+            final String internalName = entry.getKey();
+            final String shortName = internalName.substring(internalName.lastIndexOf('/') + 1);
+            named.put(shortName, entry.getValue());
+        }
+        return named;
+    }
+
+    private static Pattern buildMethodRedirectPattern() {
+        final TreeSet<String> alternatives = new TreeSet<>();
+        alternatives.add(Pattern.quote(SHORT_GL_PREFIX) + "\\w+");
+        for (final String shortName : NAMED_CLASS_SHORT_NAME_MAP.keySet()) {
+            alternatives.add(Pattern.quote(shortName));
+        }
+        final String classAlt = String.join("|", alternatives);
+        return Pattern.compile("\\b(" + classAlt + ")\\.\\w+\\b");
+    }
+}

src/main/java/com/gtnewhorizons/angelica/client/font/BatchingFontRenderer.java

@@ -334,6 +334,7 @@ public class BatchingFontRenderer {
         batchCommands.sort(FontDrawCmd.DRAW_ORDER_COMPARATOR);
 
         final boolean isTextureEnabledBefore = GLStateManager.glIsEnabled(GL11.GL_TEXTURE_2D);
+        final boolean isBlendEnabledBefore = GLStateManager.glIsEnabled(GL11.GL_BLEND);
         final int boundTextureBefore = GLStateManager.glGetInteger(GL11.GL_TEXTURE_BINDING_2D);
         boolean textureChanged = false;
 
@@ -417,6 +418,9 @@ public class BatchingFontRenderer {
         if (isTextureEnabledBefore) {
         	GLStateManager.glEnable(GL11.GL_TEXTURE_2D);
         }
+        if (!isBlendEnabledBefore) {
+            GLStateManager.disableBlend();
+        }
         if (textureChanged) {
         	GLStateManager.glBindTexture(GL11.GL_TEXTURE_2D, boundTextureBefore);
         }

src/main/java/com/gtnewhorizons/angelica/client/rendering/DeferredBatchTessellator.java

@@ -2,6 +2,7 @@ package com.gtnewhorizons.angelica.client.rendering;
 
 import com.github.bsideup.jabel.Desugar;
 import com.gtnewhorizon.gtnhlib.client.renderer.DirectTessellator;
+import com.gtnewhorizon.gtnhlib.client.renderer.ITessellatorInstance;
 import com.gtnewhorizon.gtnhlib.client.renderer.vertex.VertexFlags;
 import com.gtnewhorizon.gtnhlib.client.renderer.vertex.VertexFormat;
 import com.gtnewhorizons.angelica.glsm.GLStateManager;
@@ -33,10 +34,30 @@ class DeferredBatchTessellator extends DirectTessellator {
     private final Vector3f scratch = new Vector3f();
     private Matrix4fc currentTransform;
 
+    private Tessellator parentTessellator;
+    private boolean inIntercept;
+
     DeferredBatchTessellator(ByteBuffer buffer) {
         super(buffer, false); // deleteAfter=false: keep buffer across resets for reuse
     }
 
+    void setParentTessellator(Tessellator parent) {
+        this.parentTessellator = parent;
+    }
+
+    @Override
+    public int draw() {
+        if (!inIntercept) {
+            final Tessellator parent = parentTessellator;
+            if (parent != null && parent.isDrawing) {
+                interceptDraw(parent);
+                ((ITessellatorInstance) parent).discard();
+            }
+        }
+        isDrawing = false;
+        return 0;
+    }
+
     @Override
     protected long writeVertexData(VertexFormat format, int[] rawBuffer, int rawBufferIndex) {
         if (currentTransform != null) {
@@ -53,27 +74,32 @@ class DeferredBatchTessellator extends DirectTessellator {
 
     @Override
     protected int interceptDraw(Tessellator tess) {
-        // Compute delta: if current MV differs from default, pre-transform vertices
-        final Matrix4f currentMV = GLStateManager.getModelViewMatrix();
-        if (!currentMV.equals(defaultModelview)) {
-            defaultModelviewInverse.mul(currentMV, deltaMatrix);
-            this.currentTransform = deltaMatrix;
-        } else {
-            this.currentTransform = null;
+        inIntercept = true;
+        try {
+            // Compute delta: if current MV differs from default, pre-transform vertices
+            final Matrix4f currentMV = GLStateManager.getModelViewMatrix();
+            if (!currentMV.equals(defaultModelview)) {
+                defaultModelviewInverse.mul(currentMV, deltaMatrix);
+                this.currentTransform = deltaMatrix;
+            } else {
+                this.currentTransform = null;
+            }
+
+            final int byteOffsetBefore = bufferLimit();
+            final int vertCount = tess.vertexCount;
+            final int drawMode = tess.drawMode;
+            final int flags = VertexFlags.convertToFlags(tess.hasTexture, tess.hasColor, tess.hasNormals, tess.hasBrightness);
+            final long stateKey = DeferredDrawBatcher.captureStateKey();
+
+            final int result = super.interceptDraw(tess); // repacks int[] -> ByteBuffer + transforms if vertexTransform set
+
+            final int byteOffsetAfter = bufferLimit();
+            ranges.add(new DrawRange(stateKey, byteOffsetBefore, byteOffsetAfter - byteOffsetBefore, vertCount, drawMode, flags));
+            this.currentTransform = null; // clear for next draw
+            return result;
+        } finally {
+            inIntercept = false;
         }
-
-        final int byteOffsetBefore = bufferLimit();
-        final int vertCount = tess.vertexCount;
-        final int drawMode = tess.drawMode;
-        final int flags = VertexFlags.convertToFlags(tess.hasTexture, tess.hasColor, tess.hasNormals, tess.hasBrightness);
-        final long stateKey = DeferredDrawBatcher.captureStateKey();
-
-        final int result = super.interceptDraw(tess); // repacks int[] → ByteBuffer + transforms if vertexTransform set
-
-        final int byteOffsetAfter = bufferLimit();
-        ranges.add(new DrawRange(stateKey, byteOffsetBefore, byteOffsetAfter - byteOffsetBefore, vertCount, drawMode, flags));
-        this.currentTransform = null; // clear for next draw
-        return result;
     }
 
     List<DrawRange> getRanges() { return ranges; }
@@ -86,6 +112,7 @@ class DeferredBatchTessellator extends DirectTessellator {
 
     @Override
     protected void onRemovedFromStack() {
+        parentTessellator = null;
         clearRanges();
         super.onRemovedFromStack(); // calls reset(), keeps baseBuffer (deleteAfter=false)
     }

src/main/java/com/gtnewhorizons/angelica/client/rendering/DeferredDrawBatcher.java

@@ -2,7 +2,9 @@ package com.gtnewhorizons.angelica.client.rendering;
 
 import com.gtnewhorizon.gtnhlib.client.renderer.TessellatorManager;
 import com.gtnewhorizons.angelica.glsm.GLStateManager;
+import com.gtnewhorizons.angelica.glsm.streaming.TessellatorStreamingDrawer;
 import lombok.Getter;
+import net.minecraft.client.renderer.Tessellator;
 import org.lwjgl.opengl.GL11;
 
 import java.util.Comparator;
@@ -37,6 +39,7 @@ public class DeferredDrawBatcher {
             batchTessellator = new DeferredBatchTessellator(memAlloc(INITIAL_BUFFER_SIZE));
         }
         batchTessellator.clearRanges();
+        batchTessellator.setParentTessellator(Tessellator.instance);
         batchTessellator.snapshotDefaultModelview();
         TessellatorManager.startCapturingDirect(batchTessellator);
     }
@@ -99,15 +102,40 @@ public class DeferredDrawBatcher {
                 totalBytes += e.byteLength();
                 totalVertices += e.vertexCount();
                 subEnd++;
+
+                // Don't try to merge strips, fans, loops or polygons
+                if (drawMode == GL11.GL_TRIANGLE_STRIP || drawMode == GL11.GL_TRIANGLE_FAN || drawMode == GL11.GL_LINE_STRIP ||
+                        drawMode == GL11.GL_LINE_LOOP || drawMode == GL11.GL_QUAD_STRIP || drawMode == GL11.GL_POLYGON)
+                    break;
             }
 
-            TessellatorStreamingDrawer.drawPackedBatch(
-                batchTessellator, ranges, i, subEnd, totalBytes, totalVertices, drawMode, flags);
+            drawPackedBatch(batchTessellator, ranges, i, subEnd, totalBytes, totalVertices, drawMode, flags);
 
             i = subEnd;
         }
     }
 
+    /**
+     * Pack ranges from a DeferredBatchTessellator into the streaming drawer's repack buffer
+     * and issue a single draw call for the merged batch.
+     */
+    private static void drawPackedBatch(DeferredBatchTessellator source, List<DeferredBatchTessellator.DrawRange> ranges, int from, int to, int totalBytes, int totalVertices, int drawMode, int flags) {
+        if (totalVertices == 0) return;
+
+        TessellatorStreamingDrawer.ensureRepackCapacity(totalBytes);
+        long writePos = TessellatorStreamingDrawer.getRepackAddress();
+        for (int j = from; j < to; j++) {
+            final DeferredBatchTessellator.DrawRange r = ranges.get(j);
+            source.copyRange(r.byteOffset(), r.byteLength(), writePos);
+            writePos += r.byteLength();
+        }
+        final java.nio.ByteBuffer buf = TessellatorStreamingDrawer.getRepackBuffer();
+        buf.position(0);
+        buf.limit(totalBytes);
+
+        TessellatorStreamingDrawer.drawPacked(buf, drawMode, flags, totalVertices);
+    }
+
     /**
      * Pack current GLSM state into a long key for grouping.
      * Layout: [tex1En:1][tex0En:1][textureId:20][srcRgb:12][dstRgb:12][blendEnabled:1][depthMask:1] = 48 bits

src/main/java/com/gtnewhorizons/angelica/client/rendering/TextureTracker.java

@@ -1,10 +1,8 @@
 package com.gtnewhorizons.angelica.client.rendering;
 
-import com.gtnewhorizons.angelica.glsm.GLStateManager;
-import com.gtnewhorizons.angelica.glsm.RenderSystem;
-import com.gtnewhorizons.angelica.glsm.hooks.GLSMHooks;
 import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
 import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
+import net.coderbot.iris.gl.state.StateUpdateNotifiers;
 import net.minecraft.client.renderer.texture.AbstractTexture;
 import org.jetbrains.annotations.Nullable;
 
@@ -15,11 +13,15 @@ public class TextureTracker {
      */
 
     public static final TextureTracker INSTANCE = new TextureTracker();
-
+    
+    private static Runnable bindTextureListener;
+    
+    static {
+        StateUpdateNotifiers.bindTextureNotifier = listener -> bindTextureListener = listener;
+    }
+    
     private final Int2ObjectMap<AbstractTexture> textures = new Int2ObjectOpenHashMap<>();
 
-    private boolean lockBindCallback;
-
     private TextureTracker() {
     }
 
@@ -31,23 +33,13 @@ public class TextureTracker {
     public AbstractTexture getTexture(int id) {
         return textures.get(id);
     }
-
-    public void onBindTexture(int id) {
-        if (lockBindCallback) {
-            return;
-        }
-        if (GLStateManager.getActiveTextureUnit() == 0) {
-            lockBindCallback = true;
-            if (GLSMHooks.TEXTURE_BIND.hasListeners()) {
-                GLSMHooks.textureBindEvent.textureId = id;
-                GLSMHooks.TEXTURE_BIND.post(GLSMHooks.textureBindEvent);
-            }
-            // Reset texture state
-            RenderSystem.bindTextureToUnit(0, id);
-            lockBindCallback = false;
+    
+    public void onBindTexture() {
+        if (bindTextureListener != null) {
+            bindTextureListener.run();
         }
     }
-
+    
     public void onDeleteTexture(int id) {
         textures.remove(id);
     }

src/main/java/com/gtnewhorizons/angelica/compat/ModStatus.java

@@ -25,6 +25,7 @@ public class ModStatus {
     public static boolean isThaumicHorizonsLoaded;
     public static boolean isBaublesLoaded;
     public static boolean isFluidLoggedLoaded;
+    public static boolean isBOPLoaded;
 
     public static void preInit() {
         if (Loader.isModLoaded("backhand")) {
@@ -45,6 +46,7 @@ public class ModStatus {
         isFluidLoggedLoaded = Loader.isModLoaded("fluidlogged");
 
         isHoloInventoryLoaded = Loader.isModLoaded("holoinventory");
+        isBOPLoaded = Loader.isModLoaded("BiomesOPlenty");
 
         // remove compat with original release of BG2
         if (isBattlegearLoaded){

src/main/java/com/gtnewhorizons/angelica/compat/bettercrashes/BetterCrashesCompat.java

@@ -1,34 +1,33 @@
 package com.gtnewhorizons.angelica.compat.bettercrashes;
 
+import com.gtnewhorizons.angelica.AngelicaMod;
 import com.gtnewhorizons.angelica.glsm.GLStateManager;
 import com.gtnewhorizons.angelica.mixins.interfaces.IRenderGlobalExt;
 import cpw.mods.fml.common.Optional;
 import net.minecraft.client.Minecraft;
 import vfyjxf.bettercrashes.utils.StateManager;
 
-import static com.gtnewhorizons.angelica.loading.AngelicaTweaker.LOGGER;
-
 @Optional.Interface(modid = "angelica", iface = "vfyjxf.bettercrashes.utils.StateManager.IResettable")
 public class BetterCrashesCompat implements StateManager.IResettable {
+
     private static BetterCrashesCompat INSTANCE;
 
+    public BetterCrashesCompat() {
+        AngelicaMod.LOGGER.info("BetterCrashesCompat initialized");
+        this.register();
+    }
+
     public static void init() {
         if (INSTANCE == null) {
             INSTANCE = new BetterCrashesCompat();
         }
     }
 
-
-    public BetterCrashesCompat() {
-        LOGGER.info("BetterCrashesCompat initialized");
-        this.register();
-    }
-
     @Override
     public void resetState() {
-        LOGGER.info("Reloading SodiumRenderer");
+        AngelicaMod.LOGGER.info("Reloading SodiumRenderer");
         ((IRenderGlobalExt) Minecraft.getMinecraft().renderGlobal).angelica$reload();
-        LOGGER.info("Resetting GLStateManager");
+        AngelicaMod.LOGGER.info("Resetting GLStateManager");
         GLStateManager.reset();
     }
 }

src/main/java/com/gtnewhorizons/angelica/compat/mojang/Camera.java

@@ -26,12 +26,11 @@ public class Camera {
 
     private float pitch;
     private float yaw;
-    private EntityLivingBase entity;
+    private boolean isSleeping;
     private boolean thirdPerson;
     private float partialTicks;
 
-    private Camera() {
-    }
+    private Camera() {}
 
     /**
      * Updates the camera position and orientation based on the current entity and partial ticks.
@@ -41,7 +40,7 @@ public class Camera {
      */
     public void update(EntityLivingBase entity, float partialTicks) {
         this.partialTicks = partialTicks;
-        this.entity = entity;
+        this.isSleeping = entity.isPlayerSleeping();
 
         // Entity position (interpolated, at eye level)
         final double entityX = entity.lastTickPosX + (entity.posX - entity.lastTickPosX) * partialTicks;

src/main/java/com/gtnewhorizons/angelica/config/AngelicaConfig.java

@@ -235,6 +235,11 @@ public class AngelicaConfig {
     @Config.DefaultBoolean(false)
     public static boolean enableHardcodedCustomUniforms;
 
+    @Config.Comment("Modern MC_VERSION to try if shader pack has no 1.7.10 section. 0 = default (260101)")
+    @Config.DefaultInt(0)
+    @Config.RangeInt(min = 0)
+    public static int modernFallbackMcVersion;
+
     @Config.Comment("Define IS_IRIS in shader macros.")
     @Config.DefaultBoolean(true)
     public static boolean defineIsIris;
@@ -262,6 +267,11 @@ public class AngelicaConfig {
         @Config.DefaultBoolean(true)
         @Config.RequiresMcRestart
         public boolean narrowAlfheim;
+
+        @Config.Comment("Narrow Ears transformer exclusions to allow GL redirection")
+        @Config.DefaultBoolean(true)
+        @Config.RequiresMcRestart
+        public boolean narrowEars;
     }
 
     @Config.Comment("Renders chunks before neighbors are ready. Improves loading at render distance edges, useful for low render distance servers.")

src/main/java/com/gtnewhorizons/angelica/config/CompatConfig.java

@@ -45,23 +45,9 @@ public class CompatConfig {
     @Config.RequiresMcRestart
     public static boolean fixSecurityCraft;
     
-    @Config.Comment("Apply tweaks to NTM:Space")
-    @Config.DefaultBoolean(true)
-    @Config.RequiresMcRestart
-    public static boolean tweakNTMSpace;
-    
     @Config.Comment("Apply fixes to NTM:Space")
     @Config.DefaultBoolean(true)
     @Config.RequiresMcRestart
     public static boolean fixNTMSpace;
-    
-    @Config.Comment("Disables rendering of the planet below the player at high altitudes [Requires tweakNTMSpace]")
-    @Config.DefaultEnum("ShadersOnly")
-    public static altitudePlanetRendererState NTMSpace_disableAltitudePlanetRenderer;
-    public enum altitudePlanetRendererState {
-        Always,
-        ShadersOnly,
-        Never
-    }
 
 }

src/main/java/com/gtnewhorizons/angelica/hudcaching/HUDCaching.java

@@ -25,6 +25,7 @@ import net.minecraft.client.renderer.EntityRenderer;
 import net.minecraftforge.client.GuiIngameForge;
 import net.minecraftforge.client.event.RenderGameOverlayEvent;
 import org.lwjgl.opengl.GL11;
+import org.lwjgl.opengl.GL13;
 import thaumcraft.common.Thaumcraft;
 import xaero.common.core.XaeroMinimapCore;
 
@@ -69,6 +70,12 @@ public class HUDCaching {
             XaeroMinimapCore.beforeIngameGuiRender(partialTicks);
         }
 
+        GLStateManager.disableLighting();
+        GLStateManager.glActiveTexture(GL13.GL_TEXTURE1);
+        GLStateManager.disableTexture();
+        GLStateManager.glActiveTexture(GL13.GL_TEXTURE0);
+        GLStateManager.enableTexture();
+
         if (!AngelicaConfig.hudCachingActive || !GLStateManager.isFramebufferEnabled()) {
             ingame.renderGameOverlay(partialTicks, hasScreen, mouseX, mouseY);
             return;

src/main/java/com/gtnewhorizons/angelica/iris/IrisGLSMBridge.java

@@ -1,5 +1,6 @@
 package com.gtnewhorizons.angelica.iris;
 
+import com.gtnewhorizons.angelica.client.rendering.TextureTracker;
 import com.gtnewhorizons.angelica.glsm.hooks.DeferredAlphaHandler;
 import com.gtnewhorizons.angelica.glsm.hooks.DeferredBlendHandler;
 import com.gtnewhorizons.angelica.glsm.hooks.DeferredDepthColorHandler;
@@ -10,13 +11,33 @@ import net.coderbot.iris.gl.blending.AlphaTestStorage;
 import net.coderbot.iris.gl.blending.BlendModeStorage;
 import net.coderbot.iris.gl.blending.DepthColorStorage;
 import net.coderbot.iris.gl.program.ProgramUniforms;
+import net.coderbot.iris.gl.state.StateUpdateNotifiers;
 import net.coderbot.iris.pipeline.DeferredWorldRenderingPipeline;
 import net.coderbot.iris.pipeline.WorldRenderingPipeline;
 import net.coderbot.iris.samplers.IrisSamplers;
 import net.coderbot.iris.texture.pbr.PBRTextureManager;
+import net.coderbot.iris.vertices.ImmediateState;
 
 public class IrisGLSMBridge {
 
+    private static Runnable alphaFuncListener = null;
+    private static Runnable alphaTestListener = null;
+    private static Runnable blendFuncListener = null;
+    private static Runnable fogModeListener = null;
+    private static Runnable fogStartListener = null;
+    private static Runnable fogEndListener = null;
+    private static Runnable fogDensityListener = null;
+
+    static {
+        StateUpdateNotifiers.alphaFuncNotifier = listener -> alphaFuncListener = listener;
+        StateUpdateNotifiers.alphaTestNotifier = listener -> alphaTestListener = listener;
+        StateUpdateNotifiers.blendFuncNotifier = listener -> blendFuncListener = listener;
+        StateUpdateNotifiers.fogModeNotifier = listener -> fogModeListener = listener;
+        StateUpdateNotifiers.fogStartNotifier = listener -> fogStartListener = listener;
+        StateUpdateNotifiers.fogEndNotifier = listener -> fogEndListener = listener;
+        StateUpdateNotifiers.fogDensityNotifier = listener -> fogDensityListener = listener;
+    }
+
     public static void register() {
         IrisSamplers.initRenderer();
         GLSMHooks.blendHandler = new DeferredBlendHandler() {
@@ -75,8 +96,31 @@ public class IrisGLSMBridge {
             }
         };
 
+        GLSMHooks.ALPHA_STATE_CHANGE.addListener(event -> {
+            if (Iris.enabled) {
+                if (alphaFuncListener != null) alphaFuncListener.run();
+                if (alphaTestListener != null) alphaTestListener.run();
+            }
+        });
+
+        GLSMHooks.BLEND_FUNC_CHANGE.addListener(event -> {
+            if (Iris.enabled) {
+                if (blendFuncListener != null) blendFuncListener.run();
+            }
+        });
+
+        GLSMHooks.FOG_STATE_CHANGE.addListener(event -> {
+            if (Iris.enabled) {
+                if (fogModeListener != null) fogModeListener.run();
+                if (fogStartListener != null) fogStartListener.run();
+                if (fogEndListener != null) fogEndListener.run();
+                if (fogDensityListener != null) fogDensityListener.run();
+            }
+        });
+
         GLSMHooks.TEXTURE_BIND.addListener(event -> {
             if (Iris.enabled) {
+                TextureTracker.INSTANCE.onBindTexture();
                 final WorldRenderingPipeline pipeline = Iris.getPipelineManager().getPipelineNullable();
                 if (pipeline != null) {
                     pipeline.onBindTexture(event.textureId);
@@ -114,10 +158,10 @@ public class IrisGLSMBridge {
             if (!drp.shouldOverrideShaders()) return;
             if (drp.getActivePassProgramId() == -1) return;
 
-            if (DepthColorStorage.isOwnedProgram(event.newProgram)) {
+            if (!ImmediateState.isRenderingLevel || DepthColorStorage.isOwnedProgram(event.newProgram)) {
                 DepthColorStorage.unlockDepthColor();
             } else {
-                DepthColorStorage.disableDepthColor();
+                drp.onModProgramOverride();
             }
         });
     }

src/main/java/com/gtnewhorizons/angelica/loading/AngelicaClientTweaker.java

@@ -0,0 +1,221 @@
+package com.gtnewhorizons.angelica.loading;
+
+import com.gtnewhorizon.gtnhlib.config.ConfigException;
+import com.gtnewhorizon.gtnhlib.config.ConfigurationManager;
+import com.gtnewhorizon.gtnhmixins.IEarlyMixinLoader;
+import com.gtnewhorizon.gtnhmixins.builders.IMixins;
+import com.gtnewhorizon.gtnhmixins.builders.ITransformers;
+import com.gtnewhorizons.angelica.config.AngelicaConfig;
+import com.gtnewhorizons.angelica.config.CompatConfig;
+import com.gtnewhorizons.angelica.config.FontConfig;
+import com.gtnewhorizons.angelica.glsm.loading.DependencyVerifier;
+import com.gtnewhorizons.angelica.glsm.loading.EcosystemNarrowRules;
+import com.gtnewhorizons.angelica.loading.fml.compat.CompatHandlers;
+import com.gtnewhorizons.angelica.mixins.Mixins;
+import com.gtnewhorizons.retrofuturabootstrap.SharedConfig;
+import cpw.mods.fml.relauncher.FMLLaunchHandler;
+import cpw.mods.fml.relauncher.IFMLLoadingPlugin;
+import jss.notfine.asm.AsmTransformers;
+import jss.notfine.asm.mappings.Namer;
+import jss.notfine.config.MCPatcherForgeConfig;
+import jss.notfine.config.NotFineConfig;
+import net.minecraft.launchwrapper.Launch;
+import org.apache.logging.log4j.Level;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.apache.logging.log4j.core.LoggerContext;
+import org.apache.logging.log4j.core.config.Configuration;
+import org.apache.logging.log4j.core.config.LoggerConfig;
+import org.spongepowered.asm.launch.GlobalProperties;
+import org.spongepowered.asm.service.mojang.MixinServiceLaunchWrapper;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+// this is not the real IFMLLoadingPlugin, if you put any annotations
+// here it won't do anything, that's why we register transformer
+// exclusions manually in the constructor
+public final class AngelicaClientTweaker implements IFMLLoadingPlugin, IEarlyMixinLoader {
+
+    public static final Logger LOGGER = LogManager.getLogger("Angelica");
+    private static Boolean OBF_ENV;
+    private String[] transformerClasses;
+
+    public AngelicaClientTweaker() {
+        Launch.classLoader.addTransformerExclusion("jss.notfine.asm");
+        Launch.classLoader.addTransformerExclusion("com.gtnewhorizons.angelica.loading");
+        Launch.classLoader.addTransformerExclusion("com.gtnewhorizons.angelica.glsm.GLStateManager");
+
+        if (Launch.blackboard.getOrDefault("angelica.rfbPluginLoaded", Boolean.FALSE) == Boolean.TRUE) {
+            addLwjgl3ifyExclusions();
+        }
+
+        try {
+            // Angelica Config
+            ConfigurationManager.registerConfig(AngelicaConfig.class);
+            ConfigurationManager.registerConfig(CompatConfig.class);
+            ConfigurationManager.registerConfig(FontConfig.class);
+            MCPatcherForgeConfig.registerConfig();
+            final LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
+            final Configuration config = ctx.getConfiguration();
+            final LoggerConfig loggerConfig = config.getLoggerConfig(LogManager.ROOT_LOGGER_NAME);
+            if (AngelicaConfig.enableDebugLogging) {
+                loggerConfig.setLevel(Level.DEBUG);
+            }
+            ctx.updateLoggers();
+
+            // Debug features
+            AngelicaConfig.enableTestBlocks = Boolean.getBoolean("angelica.enableTestBlocks");
+
+        } catch (ConfigException e) {
+            throw new RuntimeException(e);
+        }
+        verifyDependencies();
+
+        // Register a scoped redirector early so classes prematurely loaded by other coremods during discovery/injectData
+        // (e.g. Mycelium using HookLoader.class.getName()) still get GL calls redirected to GLSM. Only targets specific mod
+        // packages to avoid interfering with mixin delegation on game classes. AngelicaLateTweaker removes this registration once
+        // mixins are setup.
+        if (FMLLaunchHandler.side().isClient()) {
+            final boolean rfbLoaded = Launch.blackboard.getOrDefault("angelica.rfbPluginLoaded", Boolean.FALSE) == Boolean.TRUE;
+            if (!rfbLoaded) {
+                Launch.classLoader.registerTransformer("com.gtnewhorizons.angelica.loading.fml.transformers.EarlyRedirectorTransformer");
+            }
+        }
+    }
+
+    private static void addLwjgl3ifyExclusions() {
+        final var handle = SharedConfig.getRfbTransformers().stream()
+            .filter(transformer -> transformer.id().equals("lwjgl3ify:redirect"))
+            .findFirst()
+            .orElse(null);
+        if (handle != null) {
+            for (String exclusion : EcosystemNarrowRules.LWJGL3IFY_EXCLUSIONS_SHARED) {
+                handle.exclusions().add(exclusion);
+            }
+            handle.exclusions().add("com.gtnewhorizons.angelica.vulkan");
+        }
+    }
+
+    private static void verifyDependencies() {
+        DependencyVerifier.verify(AngelicaTweaker.class, List.of(
+            new DependencyVerifier.Check(
+                "/it/unimi/dsi/fastutil/ints/Int2ObjectMap.class",
+                "Missing dependency: Angelica requires GTNHLib! Download: https://modrinth.com/mod/gtnhlib"),
+            new DependencyVerifier.Check(
+                "/xyz/wagyourtail/jvmdg/exc/MissingStubError.class",
+                "GTNHLib is outdated: Angelica requires GTNHLib 0.9.0 or newer! Download: https://modrinth.com/mod/gtnhlib")
+        ));
+    }
+
+    @Override
+    public String[] getASMTransformerClass() {
+        if (transformerClasses == null) {
+            final List<String> transformers = new ArrayList<>();
+            transformers.addAll(CompatHandlers.getTransformers());
+            // Add NotFine transformers
+            final List<String> notFineTransformers = Arrays.asList(ITransformers.getTransformers(AsmTransformers.class));
+            if (!notFineTransformers.isEmpty()) Namer.initNames();
+            transformers.addAll(notFineTransformers);
+            transformerClasses = transformers.toArray(new String[0]);
+        }
+        return transformerClasses;
+    }
+
+    @Override
+    public String getModContainerClass() {
+        return null;
+    }
+
+    @Override
+    public String getSetupClass() {
+        return null;
+    }
+
+    @Override
+    public void injectData(Map<String, Object> data) {
+        OBF_ENV = (Boolean) data.get("runtimeDeobfuscationEnabled");
+        // Directly add this to the MixinServiceLaunchWrapper tweaker's list of Tweak Classes
+        final List<String> tweaks = GlobalProperties.get(MixinServiceLaunchWrapper.BLACKBOARD_KEY_TWEAKCLASSES);
+        if (tweaks != null) {
+            // Bridge transformer compat config to blackboard for AngelicaLateTweaker
+            narrowTransformerConfig("DragonAPI", AngelicaConfig.transformerCompat.narrowDragonAPI);
+            narrowTransformerConfig("Xaeros", AngelicaConfig.transformerCompat.narrowXaeros);
+            narrowTransformerConfig("AdvancedLightsabers", AngelicaConfig.transformerCompat.narrowAdvancedLightsabers);
+            narrowTransformerConfig("Alfheim", AngelicaConfig.transformerCompat.narrowAlfheim);
+            narrowTransformerConfig("Ears", AngelicaConfig.transformerCompat.narrowEars);
+
+            tweaks.add("com.gtnewhorizons.angelica.loading.fml.tweakers.IncompatibleModsDisablerTweaker");
+            if (AngelicaConfig.enableHudCaching) {
+                tweaks.add("com.gtnewhorizons.angelica.loading.fml.tweakers.XaerosTransformerDisablerTweaker");
+            }
+            if (FMLLaunchHandler.side().isClient()) {
+                // We register ITweakers that will run last in order to register
+                // specific IClassTransformers that will run last in the transformer chain.
+                // If we were to register them normally in getASMTransformerClass(),
+                // they would be sorted at index 0 which we do not want.
+                final boolean rfbLoaded = Launch.blackboard.getOrDefault("angelica.rfbPluginLoaded", Boolean.FALSE) == Boolean.TRUE;
+                if (!rfbLoaded) {
+                    tweaks.add("com.gtnewhorizons.angelica.loading.fml.tweakers.AngelicaLateTweaker");
+                    if (AngelicaConfig.enableCeleritas) {
+                        tweaks.add("com.gtnewhorizons.angelica.loading.fml.tweakers.CeleritasLateTweaker");
+                    }
+                }
+            }
+        }
+    }
+
+    /** Publish a transformer-narrowing toggle to the blackboard; read by AngelicaLateTweaker.narrowEnabled(). */
+    private static void narrowTransformerConfig(String mod, boolean enabled) {
+        Launch.blackboard.put("angelica.narrow." + mod, enabled);
+    }
+
+    @Override
+    public String getAccessTransformerClass() {
+        return null;
+    }
+
+    @Override
+    public String getMixinConfig() {
+        final int v = Runtime.version().feature();
+        if (v >= 21) return "mixins.angelica.early.j21.json";
+        if (v >= 17) return "mixins.angelica.early.j17.json";
+        return "mixins.angelica.early.json";
+    }
+
+    @Override
+    public List<String> getMixins(Set<String> loadedCoreMods) {
+        NotFineConfig.loadSettings();
+        //This may be possible to handle differently or fix.
+        if (loadedCoreMods.contains("cofh.asm.LoadingPlugin")) {
+            MCPatcherForgeConfig.ExtendedHD.hdFont = false;
+        }
+        return IMixins.getEarlyMixins(Mixins.class, loadedCoreMods);
+    }
+
+    /**
+     * Returns true if we are in an obfuscated environment, returns false in dev environment.
+     */
+    public static boolean isObfEnv() {
+        if (OBF_ENV == null) {
+            throw new IllegalStateException("Obfuscation state has been accessed too early!");
+        }
+        return OBF_ENV;
+    }
+
+    /**
+     * Returns the appropriate name according to current environment's obfuscation
+     */
+    public static String obf(String deobf, String obf) {
+        if (OBF_ENV == null) {
+            throw new IllegalStateException("Obfuscation state has been accessed too early!");
+        }
+        if (OBF_ENV) {
+            return obf;
+        }
+        return deobf;
+    }
+}

src/main/java/com/gtnewhorizons/angelica/loading/AngelicaTweaker.java

@@ -1,34 +1,12 @@
 package com.gtnewhorizons.angelica.loading;
 
-import com.gtnewhorizon.gtnhlib.config.ConfigException;
-import com.gtnewhorizon.gtnhlib.config.ConfigurationManager;
 import com.gtnewhorizon.gtnhmixins.IEarlyMixinLoader;
-import com.gtnewhorizon.gtnhmixins.builders.IMixins;
-import com.gtnewhorizon.gtnhmixins.builders.ITransformers;
-import com.gtnewhorizons.angelica.config.AngelicaConfig;
-import com.gtnewhorizons.angelica.config.CompatConfig;
-import com.gtnewhorizons.angelica.config.FontConfig;
-import com.gtnewhorizons.angelica.mixins.Mixins;
-import com.gtnewhorizons.angelica.loading.fml.compat.CompatHandlers;
 import cpw.mods.fml.relauncher.FMLLaunchHandler;
 import cpw.mods.fml.relauncher.IFMLLoadingPlugin;
-import jss.notfine.asm.AsmTransformers;
-import jss.notfine.asm.mappings.Namer;
-import jss.notfine.config.MCPatcherForgeConfig;
-import jss.notfine.config.NotFineConfig;
-import com.gtnewhorizons.retrofuturabootstrap.SharedConfig;
-import net.minecraft.launchwrapper.Launch;
-import org.apache.logging.log4j.Level;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
-import org.apache.logging.log4j.core.LoggerContext;
-import org.apache.logging.log4j.core.config.Configuration;
-import org.apache.logging.log4j.core.config.LoggerConfig;
-import org.spongepowered.asm.launch.GlobalProperties;
-import org.spongepowered.asm.service.mojang.MixinServiceLaunchWrapper;
 
-import java.util.ArrayList;
-import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
@@ -41,195 +19,76 @@ import java.util.Set;
 // They will instead use default index 0 which means they will see
 // obfuscated mappings and not SRG mappings when running outside of dev env.
 // ===============================================
-//@IFMLLoadingPlugin.SortingIndex(Integer.MAX_VALUE - 5)
 @IFMLLoadingPlugin.MCVersion("1.7.10")
-@IFMLLoadingPlugin.TransformerExclusions({
-    "jss.notfine.asm",
-    "com.gtnewhorizons.angelica.loading",
-    "com.gtnewhorizons.angelica.glsm.GLStateManager"
-})
 public class AngelicaTweaker implements IFMLLoadingPlugin, IEarlyMixinLoader {
 
-    private static Boolean OBF_ENV;
-    public static final Logger LOGGER = LogManager.getLogger("Angelica");
-
-    private String[] transformerClasses;
+    private final IFMLLoadingPlugin loadingPlugin;
+    private final IEarlyMixinLoader mixinLoader;
 
     public AngelicaTweaker() {
-        if (Launch.blackboard.getOrDefault("angelica.rfbPluginLoaded", Boolean.FALSE) == Boolean.TRUE) {
-            addLwjgl3ifyExclusions();
-        }
-
-        try {
-            // Angelica Config
-            ConfigurationManager.registerConfig(AngelicaConfig.class);
-            ConfigurationManager.registerConfig(CompatConfig.class);
-            ConfigurationManager.registerConfig(FontConfig.class);
-            MCPatcherForgeConfig.registerConfig();
-            final LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
-            final Configuration config = ctx.getConfiguration();
-            final LoggerConfig loggerConfig = config.getLoggerConfig(LogManager.ROOT_LOGGER_NAME);
-            if (AngelicaConfig.enableDebugLogging) {
-                loggerConfig.setLevel(Level.DEBUG);
-            }
-            ctx.updateLoggers();
-
-            // Debug features
-            AngelicaConfig.enableTestBlocks = Boolean.getBoolean("angelica.enableTestBlocks");
-
-        } catch (ConfigException e) {
-            throw new RuntimeException(e);
-        }
-        verifyDependencies();
-
-        // Register a scoped redirector early so classes prematurely loaded by other coremods during discovery/injectData
-        // (e.g. Mycelium using HookLoader.class.getName()) still get GL calls redirected to GLSM. Only targets specific mod
-        // packages to avoid interfering with mixin delegation on game classes. AngelicaLateTweaker removes this registration once
-        // mixins are setup.
         if (FMLLaunchHandler.side().isClient()) {
-            final boolean rfbLoaded = Launch.blackboard.getOrDefault("angelica.rfbPluginLoaded", Boolean.FALSE) == Boolean.TRUE;
-            if (!rfbLoaded) {
-                Launch.classLoader.registerTransformer("com.gtnewhorizons.angelica.loading.fml.transformers.EarlyRedirectorTransformer");
-            }
-        }
-    }
-
-    private static void verifyDependencies() {
-        // Check for fastutil (bundled with GTNHLib since 0.2.1)
-        if (AngelicaTweaker.class.getResource("/it/unimi/dsi/fastutil/ints/Int2ObjectMap.class") == null) {
-            throw new RuntimeException("Missing dependency: Angelica requires GTNHLib! Download: https://modrinth.com/mod/gtnhlib");
-        }
-
-        // Check for PrimitiveExtractor/cel.model classes (added in GTNHLib 0.8.21)
-        if (AngelicaTweaker.class.getResource("/com/gtnewhorizon/gtnhlib/client/renderer/PrimitiveExtractor.class") == null) {
-            throw new RuntimeException("GTNHLib is outdated: Angelica requires GTNHLib 0.8.21 or newer! Download: https://modrinth.com/mod/gtnhlib");
-        }
-
-        // Check for jvmdowngrader stubs (bundled with GTNHLib since 0.9.0)
-        if (AngelicaTweaker.class.getResource("/xyz/wagyourtail/jvmdg/exc/MissingStubError.class") == null) {
-            throw new RuntimeException("GTNHLib is outdated: Angelica requires GTNHLib 0.9.0 or newer! Download: https://modrinth.com/mod/gtnhlib");
+            final AngelicaClientTweaker clientTweaker = new AngelicaClientTweaker();
+            loadingPlugin = clientTweaker;
+            mixinLoader = clientTweaker;
+        } else {
+            loadingPlugin = null;
+            mixinLoader = null;
+            LogManager.getLogger("Angelica").info("Trying to get more FPS on your server ? :kekw:");
         }
     }
 
     @Override
     public String[] getASMTransformerClass() {
-        if (transformerClasses == null) {
-            final List<String> transformers = new ArrayList<>();
-            transformers.addAll(CompatHandlers.getTransformers());
-            // Add NotFine transformers
-            final List<String> notFineTransformers = Arrays.asList(ITransformers.getTransformers(AsmTransformers.class));
-            if (!notFineTransformers.isEmpty()) Namer.initNames();
-            transformers.addAll(notFineTransformers);
-            transformerClasses = transformers.toArray(new String[0]);
+        if (this.loadingPlugin != null) {
+            return this.loadingPlugin.getASMTransformerClass();
         }
-        return transformerClasses;
+        return null;
     }
 
     @Override
     public String getModContainerClass() {
+        if (this.loadingPlugin != null) {
+            return this.loadingPlugin.getModContainerClass();
+        }
         return null;
     }
 
     @Override
     public String getSetupClass() {
+        if (this.loadingPlugin != null) {
+            return this.loadingPlugin.getSetupClass();
+        }
         return null;
     }
 
-    /** Publish a transformer-narrowing toggle to the blackboard; read by AngelicaLateTweaker.narrowEnabled(). */
-    private static void narrowTransformerConfig(String mod, boolean enabled) {
-        Launch.blackboard.put("angelica.narrow." + mod, enabled);
-    }
-
     @Override
     public void injectData(Map<String, Object> data) {
-        OBF_ENV = (Boolean) data.get("runtimeDeobfuscationEnabled");
-        // Directly add this to the MixinServiceLaunchWrapper tweaker's list of Tweak Classes
-        final List<String> tweaks = GlobalProperties.get(MixinServiceLaunchWrapper.BLACKBOARD_KEY_TWEAKCLASSES);
-        if (tweaks != null) {
-            // Bridge transformer compat config to blackboard for AngelicaLateTweaker
-            narrowTransformerConfig("DragonAPI", AngelicaConfig.transformerCompat.narrowDragonAPI);
-            narrowTransformerConfig("Xaeros", AngelicaConfig.transformerCompat.narrowXaeros);
-            narrowTransformerConfig("AdvancedLightsabers", AngelicaConfig.transformerCompat.narrowAdvancedLightsabers);
-            narrowTransformerConfig("Alfheim", AngelicaConfig.transformerCompat.narrowAlfheim);
-
-            tweaks.add("com.gtnewhorizons.angelica.loading.fml.tweakers.IncompatibleModsDisablerTweaker");
-            if (AngelicaConfig.enableHudCaching) {
-                tweaks.add("com.gtnewhorizons.angelica.loading.fml.tweakers.XaerosTransformerDisablerTweaker");
-            }
-            if (FMLLaunchHandler.side().isClient()) {
-                // We register ITweakers that will run last in order to register
-                // specific IClassTransformers that will run last in the transformer chain.
-                // If we were to register them normally in getASMTransformerClass(),
-                // they would be sorted at index 0 which we do not want.
-                final boolean rfbLoaded = Launch.blackboard.getOrDefault("angelica.rfbPluginLoaded", Boolean.FALSE) == Boolean.TRUE;
-                if (!rfbLoaded) {
-                    tweaks.add("com.gtnewhorizons.angelica.loading.fml.tweakers.AngelicaLateTweaker");
-                    if (AngelicaConfig.enableCeleritas) {
-                        tweaks.add("com.gtnewhorizons.angelica.loading.fml.tweakers.CeleritasLateTweaker");
-                    }
-                }
-            }
+        if (this.loadingPlugin != null) {
+            this.loadingPlugin.injectData(data);
         }
     }
 
     @Override
     public String getAccessTransformerClass() {
+        if (this.loadingPlugin != null) {
+            return this.loadingPlugin.getAccessTransformerClass();
+        }
         return null;
     }
 
     @Override
     public String getMixinConfig() {
-        final int v = Runtime.version().feature();
-        if (v >= 21) return "mixins.angelica.early.j21.json";
-        if (v >= 17) return "mixins.angelica.early.j17.json";
-        return "mixins.angelica.early.json";
+        if (this.mixinLoader != null) {
+            return this.mixinLoader.getMixinConfig();
+        }
+        return "mixins.angelica.server.json";
     }
 
     @Override
     public List<String> getMixins(Set<String> loadedCoreMods) {
-        NotFineConfig.loadSettings();
-        //This may be possible to handle differently or fix.
-        if (loadedCoreMods.contains("cofh.asm.LoadingPlugin")) {
-            MCPatcherForgeConfig.ExtendedHD.hdFont = false;
+        if (this.mixinLoader != null) {
+            return this.mixinLoader.getMixins(loadedCoreMods);
         }
-        return IMixins.getEarlyMixins(Mixins.class, loadedCoreMods);
-    }
-
-    private static void addLwjgl3ifyExclusions() {
-        final var handle = SharedConfig.getRfbTransformers().stream()
-            .filter(transformer -> transformer.id().equals("lwjgl3ify:redirect"))
-            .findFirst()
-            .orElse(null);
-        if (handle != null) {
-            handle.exclusions().add("org.embeddedt.embeddium");
-            handle.exclusions().add("org.taumc.celeritas");
-            handle.exclusions().add("com.mitchej123.lwjgl.lwjgl3");
-            handle.exclusions().add("com.mitchej123.glsm");
-            handle.exclusions().add("com.gtnewhorizons.angelica.lwjgl3");
-            handle.exclusions().add("com.gtnewhorizons.angelica.vulkan");
-        }
-    }
-
-    /**
-     * Returns true if we are in an obfuscated environment, returns false in dev environment.
-     */
-    public static boolean isObfEnv() {
-        if (OBF_ENV == null) {
-            throw new IllegalStateException("Obfuscation state has been accessed too early!");
-        }
-        return OBF_ENV;
-    }
-
-    /**
-     * Returns the appropriate name according to current environment's obfuscation
-     */
-    public static String obf(String deobf, String obf) {
-        if (OBF_ENV == null) {
-            throw new IllegalStateException("Obfuscation state has been accessed too early!");
-        }
-        if (OBF_ENV) {
-            return obf;
-        }
-        return deobf;
+        return Collections.emptyList();
     }
 }

src/main/java/com/gtnewhorizons/angelica/loading/fml/compat/transformers/generic/FieldLevelTessellatorTransformer.java

@@ -1,6 +1,6 @@
 package com.gtnewhorizons.angelica.loading.fml.compat.transformers.generic;
 
-import com.gtnewhorizons.angelica.loading.AngelicaTweaker;
+import com.gtnewhorizons.angelica.loading.AngelicaClientTweaker;
 import org.spongepowered.asm.lib.Opcodes;
 import org.spongepowered.asm.lib.tree.AbstractInsnNode;
 import org.spongepowered.asm.lib.tree.ClassNode;
@@ -62,7 +62,7 @@ public class FieldLevelTessellatorTransformer {
             new FieldInsnNode(
                 Opcodes.GETSTATIC,
                 "net/minecraft/client/renderer/Tessellator",
-                AngelicaTweaker.obf("instance", "field_78398_a"),
+                AngelicaClientTweaker.obf("instance", "field_78398_a"),
                 "Lnet/minecraft/client/renderer/Tessellator;"));
         list.add(new VarInsnNode(Opcodes.ASTORE, localIndex));
         mn.instructions.insert(list);

src/main/java/com/gtnewhorizons/angelica/loading/fml/compat/transformers/generic/HUDCachingEarlyReturnTransformer.java

@@ -1,6 +1,6 @@
 package com.gtnewhorizons.angelica.loading.fml.compat.transformers.generic;
 
-import com.gtnewhorizons.angelica.loading.AngelicaTweaker;
+import com.gtnewhorizons.angelica.loading.AngelicaClientTweaker;
 import org.spongepowered.asm.lib.Opcodes;
 import org.spongepowered.asm.lib.tree.ClassNode;
 import org.spongepowered.asm.lib.tree.InsnList;
@@ -29,7 +29,7 @@ public class HUDCachingEarlyReturnTransformer {
                 } else if (method.desc.endsWith("V")) {
                     list.add(new InsnNode(Opcodes.RETURN));
                 } else {
-                    AngelicaTweaker.LOGGER.warn(
+                    AngelicaClientTweaker.LOGGER.warn(
                         "HUDCaching Conditional Return - Unknown return type: {}#{}:{}", cn.name, method.name, method.desc
                     );
                     return;

src/main/java/com/gtnewhorizons/angelica/loading/fml/compat/transformers/generic/TileEntityNullGuardTransformer.java

@@ -1,6 +1,6 @@
 package com.gtnewhorizons.angelica.loading.fml.compat.transformers.generic;
 
-import com.gtnewhorizons.angelica.loading.AngelicaTweaker;
+import com.gtnewhorizons.angelica.loading.AngelicaClientTweaker;
 import org.spongepowered.asm.lib.Opcodes;
 import org.spongepowered.asm.lib.tree.AbstractInsnNode;
 import org.spongepowered.asm.lib.tree.ClassNode;
@@ -59,7 +59,7 @@ public class TileEntityNullGuardTransformer {
             AbstractInsnNode in = mn.instructions.get(i);
             if (in instanceof MethodInsnNode min) {
                 if (min.getOpcode() == Opcodes.INVOKEINTERFACE
-                    && min.name.equals(AngelicaTweaker.obf("getTileEntity", "func_147438_o"))
+                    && min.name.equals(AngelicaClientTweaker.obf("getTileEntity", "func_147438_o"))
                     && min.owner.equals("net/minecraft/world/IBlockAccess")) {
                     AbstractInsnNode castNodeAbstract = min.getNext();
                     if (castNodeAbstract instanceof TypeInsnNode castNodeType) {
@@ -77,7 +77,7 @@ public class TileEntityNullGuardTransformer {
                                     } else if (mn.desc.endsWith("V")) {
                                         list.add(new InsnNode(Opcodes.RETURN));
                                     } else {
-                                        AngelicaTweaker.LOGGER.warn("TileEntityNullGuard - Unknown Return Type: {}:{}", mn.name, mn.desc);
+                                        AngelicaClientTweaker.LOGGER.warn("TileEntityNullGuard - Unknown Return Type: {}:{}", mn.name, mn.desc);
                                         return;
                                     }
                                     list.add(exit);

src/main/java/com/gtnewhorizons/angelica/loading/fml/compat/transformers/specific/ImmersiveEngineeringTransformer.java

@@ -1,6 +1,6 @@
 package com.gtnewhorizons.angelica.loading.fml.compat.transformers.specific;
 
-import com.gtnewhorizons.angelica.loading.AngelicaTweaker;
+import com.gtnewhorizons.angelica.loading.AngelicaClientTweaker;
 import com.gtnewhorizons.angelica.loading.shared.AngelicaClassDump;
 import net.minecraft.launchwrapper.IClassTransformer;
 import org.spongepowered.asm.lib.ClassReader;
@@ -60,7 +60,7 @@ public class ImmersiveEngineeringTransformer implements IClassTransformer {
         MixinClassWriter cw = new MixinClassWriter(MixinClassWriter.COMPUTE_FRAMES);
         cn.accept(cw);
         final byte[] bytes = cw.toByteArray();
-        AngelicaTweaker.LOGGER.info("[AngelicaCompat]Extra Transformers: Applied ImmersiveEngineeringTransformer");
+        AngelicaClientTweaker.LOGGER.info("[AngelicaCompat]Extra Transformers: Applied ImmersiveEngineeringTransformer");
         AngelicaClassDump.dumpClass(transformedName, basicClass, bytes, this);
         return bytes;
     }

src/main/java/com/gtnewhorizons/angelica/loading/fml/compat/transformers/specific/StacksOnStacksTransformer.java

@@ -1,7 +1,7 @@
 package com.gtnewhorizons.angelica.loading.fml.compat.transformers.specific;
 
 import com.google.common.collect.ImmutableList;
-import com.gtnewhorizons.angelica.loading.AngelicaTweaker;
+import com.gtnewhorizons.angelica.loading.AngelicaClientTweaker;
 import com.gtnewhorizons.angelica.loading.shared.AngelicaClassDump;
 import net.minecraft.launchwrapper.IClassTransformer;
 import org.spongepowered.asm.lib.ClassReader;
@@ -47,7 +47,7 @@ public class StacksOnStacksTransformer implements IClassTransformer {
         ClassWriter cw = new ClassWriter(0);
         cn.accept(cw);
         final byte[] bytes = cw.toByteArray();
-        AngelicaTweaker.LOGGER.info("[AngelicaCompat]Extra Transformers: Applied StacksOnStacksTransformer");
+        AngelicaClientTweaker.LOGGER.info("[AngelicaCompat]Extra Transformers: Applied StacksOnStacksTransformer");
         AngelicaClassDump.dumpClass(transformedName, basicClass, bytes, this);
         return bytes;
     }

src/main/java/com/gtnewhorizons/angelica/loading/fml/transformers/CeleritasBlockTransformer.java

@@ -1,6 +1,6 @@
 package com.gtnewhorizons.angelica.loading.fml.transformers;
 
-import com.gtnewhorizons.angelica.loading.AngelicaTweaker;
+import com.gtnewhorizons.angelica.loading.AngelicaClientTweaker;
 import com.gtnewhorizons.angelica.loading.shared.AngelicaClassDump;
 import com.gtnewhorizons.angelica.loading.shared.transformers.CeleritasBlockTransform;
 import net.minecraft.launchwrapper.IClassTransformer;
@@ -14,7 +14,7 @@ public class CeleritasBlockTransformer implements IClassTransformer {
     private final String[] exclusions;
 
     public CeleritasBlockTransformer() {
-        this.inner = new CeleritasBlockTransform(AngelicaTweaker.isObfEnv());
+        this.inner = new CeleritasBlockTransform(AngelicaClientTweaker.isObfEnv());
         this.exclusions = inner.getTransformerExclusions();
         this.inner.setCeleritasSetting();
     }

src/main/java/com/gtnewhorizons/angelica/loading/fml/transformers/EarlyRedirectorTransformer.java

@@ -1,10 +1,8 @@
 package com.gtnewhorizons.angelica.loading.fml.transformers;
 
-import com.gtnewhorizons.angelica.loading.shared.transformers.AngelicaRedirector;
+import com.gtnewhorizons.angelica.glsm.loading.EarlyRedirectorCore;
+import com.gtnewhorizons.angelica.glsm.loading.EcosystemNarrowRules;
 import net.minecraft.launchwrapper.IClassTransformer;
-import org.objectweb.asm.ClassReader;
-import org.objectweb.asm.ClassWriter;
-import org.objectweb.asm.tree.ClassNode;
 
 /**
  * A scoped redirector that only transforms classes from known-misbehaving (core)mod packages.
@@ -13,52 +11,20 @@ import org.objectweb.asm.tree.ClassNode;
  * Those classes get missed by the late-registered {@link AngelicaRedirectorTransformer}, so their
  * GL calls permanently bypass GLSM.
  * <p>
- * This transformer is registered in the {@code AngelicaTweaker} constructor (before any
- * coremod's {@code injectData}) and is removed by {@code AngelicaLateTweaker} once the
- * full redirector is in its proper post-mixin position.
- * <p>
- * The mixin service will add this to its delegation list, but it no-ops on game classes
- * since it only targets specific mod packages.
+ * Registered in {@code AngelicaClientTweaker} constructor. Removed by {@code AngelicaLateTweaker}
+ * once the full redirector is in its proper post-mixin position.
+ *
+ * @see EcosystemNarrowRules#EARLY_REDIRECTOR_TARGETS
  */
 public class EarlyRedirectorTransformer implements IClassTransformer {
 
-    private static final String[] TARGET_PACKAGES = {
-        "cn.tesseract.mycelium.",
-    };
-
-    private final AngelicaRedirector inner = new AngelicaRedirector();
-    private final String[] exclusions = inner.getTransformerExclusions();
+    private final EarlyRedirectorCore impl = new EarlyRedirectorCore(
+        "com.gtnewhorizons.angelica.lwjgl3.",
+        "com.gtnewhorizons.angelica.transform"
+    );
 
     @Override
     public byte[] transform(String name, String transformedName, byte[] basicClass) {
-        if (basicClass == null) return null;
-
-        boolean targeted = false;
-        for (String pkg : TARGET_PACKAGES) {
-            if (transformedName.startsWith(pkg)) {
-                targeted = true;
-                break;
-            }
-        }
-        if (!targeted) return basicClass;
-
-        for (String exclusion : exclusions) {
-            if (transformedName.startsWith(exclusion)) return basicClass;
-        }
-
-        if (!inner.shouldTransform(basicClass)) {
-            return basicClass;
-        }
-
-        final ClassReader cr = new ClassReader(basicClass);
-        final ClassNode cn = new ClassNode();
-        cr.accept(cn, 0);
-        final boolean changed = inner.transformClassNode(transformedName, cn);
-        if (changed) {
-            final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
-            cn.accept(cw);
-            return cw.toByteArray();
-        }
-        return basicClass;
+        return impl.transform(transformedName, basicClass);
     }
 }

src/main/java/com/gtnewhorizons/angelica/loading/fml/tweakers/AngelicaLateTweaker.java

@@ -1,5 +1,7 @@
 package com.gtnewhorizons.angelica.loading.fml.tweakers;
 
+import com.gtnewhorizons.angelica.glsm.loading.EcosystemNarrowRules;
+import com.gtnewhorizons.angelica.glsm.loading.TransformerNarrower;
 import cpw.mods.fml.relauncher.FMLRelaunchLog;
 import net.minecraft.launchwrapper.IClassTransformer;
 import net.minecraft.launchwrapper.ITweaker;
@@ -27,8 +29,6 @@ public class AngelicaLateTweaker implements ITweaker {
 
     /**
      * Reduces overly broad transformer exclusions that prevent AngelicaRedirector from doing its job.
-     *
-     * Looking at you, DragonAPI.
      */
     @SuppressWarnings("unchecked")
     private static void narrowTransformerExclusions(LaunchClassLoader classLoader) {
@@ -37,73 +37,14 @@ public class AngelicaLateTweaker implements ITweaker {
             exceptionsField.setAccessible(true);
             final Set<String> exceptions = (Set<String>) exceptionsField.get(classLoader);
 
-            if (narrowEnabled("DragonAPI") && exceptions.remove("Reika.DragonAPI.ASM")) {
-                // Re-add non-GL classes; ASMCallsClient and utility classes with GL calls are left exposed
-                exceptions.add("Reika.DragonAPI.ASM.Patchers");
-                exceptions.add("Reika.DragonAPI.ASM.Profiling");
-                exceptions.add("Reika.DragonAPI.ASM.APIStripper");
-                exceptions.add("Reika.DragonAPI.ASM.ClassReparenter");
-                exceptions.add("Reika.DragonAPI.ASM.DependentMethodStripper");
-                exceptions.add("Reika.DragonAPI.ASM.DragonAPIClassTransformer");
-                exceptions.add("Reika.DragonAPI.ASM.FMLItemBlockPatch");
-                exceptions.add("Reika.DragonAPI.ASM.FluidNamePatch");
-                exceptions.add("Reika.DragonAPI.ASM.InterfaceInjector");
-                exceptions.add("Reika.DragonAPI.ASM.SpecialBiomePlacement");
-                exceptions.add("Reika.DragonAPI.ASM.StructureLootHooks");
-                FMLRelaunchLog.info("[Angelica] Narrowed Reika.DragonAPI.ASM transformer exclusion to allow GL redirection");
-            }
+            TransformerNarrower.narrow(exceptions, Launch.blackboard, "angelica", "Angelica",
+                EcosystemNarrowRules.ALL);
 
-            if (narrowEnabled("Xaeros")) {
-                if (exceptions.remove("xaero.common.core")) {
-                    exceptions.add("xaero.common.core.transformer");
-                    FMLRelaunchLog.info("[Angelica] Narrowed xaero.common.core transformer exclusion to allow GL redirection");
-                }
-                if (exceptions.remove("xaero.map.core")) {
-                    exceptions.add("xaero.map.core.transformer");
-                    FMLRelaunchLog.info("[Angelica] Narrowed xaero.map.core transformer exclusion to allow GL redirection");
-                }
-            }
-
-            if (narrowEnabled("AdvancedLightsabers") && exceptions.remove("com.fiskmods.lightsabers.asm")) {
-                exceptions.add("com.fiskmods.lightsabers.asm.ALLoadingPlugin");
-                exceptions.add("com.fiskmods.lightsabers.asm.ASMHooks");
-                exceptions.add("com.fiskmods.lightsabers.asm.transformers");
-                FMLRelaunchLog.info("[Angelica] Narrowed com.fiskmods.lightsabers.asm transformer exclusion to allow GL redirection");
-            }
-
-            if (narrowEnabled("Alfheim") && exceptions.remove("alfheim.common.core.asm.hook")) {
-                exceptions.add("alfheim.common.core.asm.hook.AlfheimFieldHookHandler");
-                exceptions.add("alfheim.common.core.asm.hook.AlfheimHPHooks");
-                exceptions.add("alfheim.common.core.asm.hook.Botania18AndUpBackport");
-                exceptions.add("alfheim.common.core.asm.hook.ElementalDamageAdapter");
-
-                exceptions.add("alfheim.common.core.asm.hook.integration");
-
-                exceptions.add("alfheim.common.core.asm.hook.extender.FurnaceExtender");
-                exceptions.add("alfheim.common.core.asm.hook.extender.ItemAuraRingExtender");
-                exceptions.add("alfheim.common.core.asm.hook.extender.ItemLensExtender");
-                exceptions.add("alfheim.common.core.asm.hook.extender.ItemTwigWandExtender");
-                exceptions.add("alfheim.common.core.asm.hook.extender.LightRelayExtender");
-                exceptions.add("alfheim.common.core.asm.hook.extender.PureDaisyExtender");
-                exceptions.add("alfheim.common.core.asm.hook.extender.QuartzExtender");
-                exceptions.add("alfheim.common.core.asm.hook.extender.RelicHooks");
-                exceptions.add("alfheim.common.core.asm.hook.extender.SparkExtender");
-
-                exceptions.add("alfheim.common.core.asm.hook.fixes.BotaniaGlowingRenderFixes");
-                exceptions.add("alfheim.common.core.asm.hook.fixes.CorporeaInputFix");
-                exceptions.add("alfheim.common.core.asm.hook.fixes.GodAttributesHooks");
-                exceptions.add("alfheim.common.core.asm.hook.fixes.RecipeAncientWillsFix");
-                FMLRelaunchLog.info("[Angelica] Narrowed alfheim.common.core.asm.hook transformer exclusion to allow GL redirection");
-            }
         } catch (Exception e) {
             FMLRelaunchLog.warning("[Angelica] Failed to narrow transformer exclusions: %s", e.getMessage());
         }
     }
 
-    private static boolean narrowEnabled(String mod) {
-        return !Boolean.FALSE.equals(Launch.blackboard.get("angelica.narrow." + mod));
-    }
-
     @Override
     public String getLaunchTarget() {
         return null;

src/main/java/com/gtnewhorizons/angelica/loading/rfb/AngelicaRfbPlugin.java

@@ -15,6 +15,7 @@ public class AngelicaRfbPlugin implements RfbPlugin {
     @Override
     public void onConstruction(@NotNull PluginContext ctx) {
         Launch.blackboard.put("angelica.rfbPluginLoaded", Boolean.TRUE);
+        Launch.classLoader.addClassLoaderExclusion("com.gtnewhorizons.angelica.glsm.redirect.");
     }
 
     @Override

src/main/java/com/gtnewhorizons/angelica/mixins/Mixins.java

@@ -36,7 +36,15 @@ public enum Mixins implements IMixins {
             , "angelica.MixinMinecraft"
             , "angelica.MixinMinecraft_FrameHook"
             , "angelica.MixinMinecraftServer"
+            , "angelica.bugfixes.MixinItemRenderer_EdgeDepth"
+            , "angelica.bugfixes.MixinModelCreeper_AuraBodyInflate"
+            , "angelica.bugfixes.MixinModelWither_ArmorCentering"
+            , "angelica.bugfixes.MixinRenderBlocks_CrossedSquaresNormal"
+            , "angelica.bugfixes.MixinRenderCreeper_AuraDepth"
+            , "angelica.bugfixes.MixinRenderGlobal_DeferredEntityOverlay"
             , "angelica.bugfixes.MixinRenderGlobal_DestroyBlock"
+            , "angelica.bugfixes.MixinRendererLivingEntity_DeferredEntityOverlay"
+            , "angelica.bugfixes.MixinRenderWither_ArmorCentering"
             , "angelica.bugfixes.MixinRendererLivingEntity_EyeDepth"
             , "angelica.debug.MixinMinecraft_FPSCap"
             , "angelica.ffp.MixinTessellator_CoreProfile"
@@ -236,6 +244,7 @@ public enum Mixins implements IMixins {
         .setApplyIf(() -> AngelicaConfig.enableIris)
         .addClientMixins(
               "shaders.MixinDroppedItemGlintEdges"
+            , "shaders.MixinHeldItemGlintEdges"
             , "shaders.MixinEntityPickupFX"
             , "shaders.MixinEntityRenderer"
             , "shaders.MixinGuiIngameForge"
@@ -248,6 +257,7 @@ public enum Mixins implements IMixins {
             , "shaders.MixinRenderEntityFlame"
             , "shaders.MixinRendererLivingEntity"
             , "shaders.MixinRenderGlobal"
+            , "shaders.AccessorEntityHorse"
             , "shaders.MixinRenderHorse"
             , "shaders.MixinRenderItem"
             , "shaders.MixinRenderNameTag"
@@ -277,6 +287,14 @@ public enum Mixins implements IMixins {
         )
     ),
 
+    DRAGONAPI_SHADER_REGISTRY_PARSE_ERROR(new MixinBuilder()
+        .setPhase(Phase.EARLY)
+        .addRequiredMod(TargetedMod.DRAGON_API)
+        .addClientMixins(
+            "dragonapi.MixinShaderRegistry_ParseError"
+        )
+    ),
+
     IRIS_RENDERING_NOBACKHAND(new MixinBuilder("Iris Hand Shaders")
         .setPhase(Phase.EARLY)
         .setApplyIf(() -> AngelicaConfig.enableIris)
@@ -370,17 +388,16 @@ public enum Mixins implements IMixins {
         .addRequiredMod(TargetedMod.MINEFACTORY_RELOADED)
         .setApplyIf(() -> CompatConfig.fixMinefactoryReloaded)
         .addClientMixins("client.minefactoryreloaded.MixinRedNetCableRenderer")),
-
-    NTM_SPACE_TWEAKS(new MixinBuilder("Support for 'Disable Horizon' & 'disableAltitudePlanetRenderer' options in NTM:Space")
-            .setPhase(Phase.LATE)
-            .addRequiredMod(TargetedMod.NTM_SPACE)
-            .setApplyIf(() -> CompatConfig.tweakNTMSpace)
-            .addClientMixins("client.ntmSpace.MixinSkyProviderCelestial_Tweaks")),
-    NTM_SPACE_SHADER_COMPAT(new MixinBuilder("Multiple shader fixes for NTM:Space")
+    
+    NTM_SPACE_COMPAT(new MixinBuilder("Multiple fixes for NTM:Space")
             .setPhase(Phase.LATE)
             .addRequiredMod(TargetedMod.NTM_SPACE)
             .setApplyIf(() -> CompatConfig.fixNTMSpace && AngelicaConfig.enableIris)
-            .addClientMixins("client.ntmSpace.MixinSkyProviderCelestial_ShaderCompat", "client.ntmSpace.MixinSkyProviderLaytheSunset")),
+            .addClientMixins(
+                    "client.ntmSpace.MixinSkyProviderCelestial",
+                    "client.ntmSpace.MixinSkyProviderOrbit",
+                    "client.ntmSpace.MixinSkyProviderLaytheSunset"
+            )),
 
     SPEEDUP_CAMPFIRE_BACKPORT_ANIMATIONS(new MixinBuilder("Add animation speedup support to Campfire Backport")
         .setPhase(Phase.LATE)

src/main/java/com/gtnewhorizons/angelica/proxy/ClientProxy.java

@@ -1,13 +1,16 @@
 package com.gtnewhorizons.angelica.proxy;
 
+import biomesoplenty.api.content.BOPCBlocks;
 import com.google.common.base.Objects;
 import com.gtnewhorizon.gtnhlib.client.model.loading.ModelRegistry;
 import com.gtnewhorizon.gtnhlib.client.renderer.vao.VAOManager;
 import com.gtnewhorizons.angelica.commands.AngelicaCommand;
+import com.gtnewhorizons.angelica.common.BlockError;
 import com.gtnewhorizons.angelica.compat.ModStatus;
 import com.gtnewhorizons.angelica.compat.bettercrashes.BetterCrashesCompat;
 import com.gtnewhorizons.angelica.config.AngelicaConfig;
 import com.gtnewhorizons.angelica.config.CompatConfig;
+import com.gtnewhorizons.angelica.config.ConfigMigrator;
 import com.gtnewhorizons.angelica.debug.F3Direction;
 import com.gtnewhorizons.angelica.debug.FrametimeGraph;
 import com.gtnewhorizons.angelica.debug.TPSGraph;
@@ -16,7 +19,7 @@ import com.gtnewhorizons.angelica.dynamiclights.config.EntityLightConfig;
 import com.gtnewhorizons.angelica.glsm.GLStateManager;
 import com.gtnewhorizons.angelica.hudcaching.HUDCaching;
 import com.gtnewhorizons.angelica.iris.IrisGLSMBridge;
-import com.gtnewhorizons.angelica.loading.AngelicaTweaker;
+import com.gtnewhorizons.angelica.loading.AngelicaClientTweaker;
 import com.gtnewhorizons.angelica.mixins.interfaces.IGameSettingsExt;
 import com.gtnewhorizons.angelica.render.CloudRenderer;
 import com.gtnewhorizons.angelica.rendering.AngelicaBlockSafetyRegistry;
@@ -25,6 +28,8 @@ import com.gtnewhorizons.angelica.rendering.celeritas.CeleritasSetup;
 import com.gtnewhorizons.angelica.rendering.celeritas.threading.ChunkTaskRegistry;
 import com.gtnewhorizons.angelica.rendering.celeritas.threading.DefaultChunkTaskProvider;
 import com.gtnewhorizons.angelica.rendering.celeritas.threading.ThreadedChunkTaskProvider;
+import com.gtnewhorizons.angelica.utils.AnimationMode;
+import com.gtnewhorizons.angelica.utils.ManagedEnum;
 import com.gtnewhorizons.angelica.zoom.Zoom;
 import cpw.mods.fml.common.FMLCommonHandler;
 import cpw.mods.fml.common.event.FMLInitializationEvent;
@@ -38,18 +43,17 @@ import cpw.mods.fml.relauncher.ReflectionHelper;
 import jss.notfine.core.Settings;
 import jss.notfine.gui.GuiCustomMenu;
 import jss.notfine.gui.NotFineGameOptionPages;
+import jss.notfine.gui.options.named.FOVMode;
 import me.flashyreese.mods.reeses_sodium_options.client.gui.ReeseSodiumVideoOptionsScreen;
+import me.jellysquid.mods.sodium.client.gui.SodiumGameOptions;
 import me.jellysquid.mods.sodium.client.gui.SodiumOptionsGUI;
 import net.coderbot.iris.Iris;
 import net.coderbot.iris.client.IrisDebugScreenHandler;
 import net.minecraft.block.Block;
 import net.minecraft.client.Minecraft;
-import net.minecraft.client.gui.FontRenderer;
-import net.minecraft.client.gui.Gui;
 import net.minecraft.client.gui.GuiMainMenu;
 import net.minecraft.client.gui.GuiScreen;
 import net.minecraft.client.gui.GuiVideoSettings;
-import net.minecraft.client.gui.ScaledResolution;
 import net.minecraft.client.network.NetHandlerPlayClient;
 import net.minecraft.server.integrated.IntegratedServer;
 import net.minecraft.util.Direction;
@@ -65,29 +69,41 @@ import net.minecraftforge.client.event.GuiScreenEvent;
 import net.minecraftforge.client.event.RenderGameOverlayEvent;
 import net.minecraftforge.common.MinecraftForge;
 import net.minecraftforge.event.world.WorldEvent;
-import org.lwjgl.input.Keyboard;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
 
 import java.lang.management.ManagementFactory;
 import java.util.Locale;
 import java.util.concurrent.ConcurrentHashMap;
 
 import static com.gtnewhorizons.angelica.AngelicaMod.MOD_ID;
-import static com.gtnewhorizons.angelica.loading.AngelicaTweaker.LOGGER;
 
-public class ClientProxy extends CommonProxy {
+public final class ClientProxy extends CommonProxy {
 
-    final Minecraft mc = Minecraft.getMinecraft();
-    final FrametimeGraph frametimeGraph = new FrametimeGraph();
-    final TPSGraph tpsGraph = new TPSGraph();
+    public static BlockError blockError;
+    public static final ManagedEnum<AnimationMode> animationsMode = new ManagedEnum<>(AnimationMode.VISIBLE_ONLY);
+    private static final Logger LOGGER = LogManager.getLogger("Angelica");
+    private static SodiumGameOptions CONFIG;
+    private final Minecraft mc = Minecraft.getMinecraft();
+    private final FrametimeGraph frametimeGraph = new FrametimeGraph();
+    private final TPSGraph tpsGraph = new TPSGraph();
+    public static Block bopGrass;
+
+    public static SodiumGameOptions options() {
+        if (CONFIG == null) {
+            CONFIG = SodiumGameOptions.load(ConfigMigrator.handleConfigMigration("angelica-options.json"));
+        }
+        return CONFIG;
+    }
 
     @Override
     public void preInit(FMLPreInitializationEvent event) {
+        ModStatus.preInit();
         super.preInit(event);
-
         FMLCommonHandler.instance().bus().register(this);
         MinecraftForge.EVENT_BUS.register(this);
-
         ModelRegistry.registerModid(MOD_ID);
+        blockError = new BlockError();
     }
 
     @SubscribeEvent
@@ -138,7 +154,6 @@ public class ClientProxy extends CommonProxy {
         FMLCommonHandler.instance().bus().register(this);
         MinecraftForge.EVENT_BUS.register(this);
 
-
         if (ModStatus.isBetterCrashesLoaded) {
             BetterCrashesCompat.init();
         }
@@ -150,7 +165,7 @@ public class ClientProxy extends CommonProxy {
         }
 
         // Register debug commands in dev environment only
-        if (!AngelicaTweaker.isObfEnv()) {
+        if (!AngelicaClientTweaker.isObfEnv()) {
             ClientCommandHandler.instance.registerCommand(new AngelicaCommand());
         }
     }
@@ -170,6 +185,9 @@ public class ClientProxy extends CommonProxy {
                 LOGGER.error("Could not replace LOTR handle render code with thread safe version");
             }
         }
+        if(ModStatus.isBOPLoaded) {
+            bopGrass = BOPCBlocks.newBopGrass;
+        }
     }
 
     float lastIntegratedTickTime;
@@ -325,10 +343,19 @@ public class ClientProxy extends CommonProxy {
         }
     }
 
-    // This is a bit of a hack to prevent the FOV from being modified by other mods
+    // This only disables FOV changes from vanilla, leaving mod FOV changes untouched
+    @SubscribeEvent(priority = EventPriority.HIGHEST)
+    public void onFOVModifierUpdateEarly(FOVUpdateEvent event) {
+        if(Settings.DYNAMIC_FOV.option.getStore() == FOVMode.MODS) {
+            event.fov = 1.0F;
+            event.newfov = 1.0F;
+        }
+    }
+
+    // This removes all FOV dynamics, both from vanilla (speed/sprinting), and mods
     @SubscribeEvent(priority = EventPriority.LOWEST)
-    public void onFOVModifierUpdate(FOVUpdateEvent event) {
-        if (!(boolean) Settings.DYNAMIC_FOV.option.getStore()) {
+    public void onFOVModifierUpdateLate(FOVUpdateEvent event) {
+        if(Settings.DYNAMIC_FOV.option.getStore() == FOVMode.NONE) {
             event.newfov = 1.0F;
         }
     }

src/main/java/com/gtnewhorizons/angelica/proxy/CommonProxy.java

@@ -10,8 +10,7 @@ import cpw.mods.fml.common.registry.GameRegistry;
 public class CommonProxy {
 
     public void preInit(FMLPreInitializationEvent event) {
-
-        if (AngelicaConfig.enableTestBlocks){
+        if (AngelicaConfig.enableTestBlocks) {
             GameRegistry.registerBlock(new BlockTest(), "test_block");
         }
     }

src/main/java/com/gtnewhorizons/angelica/rendering/DeferredEntityOverlay.java

@@ -0,0 +1,215 @@
+package com.gtnewhorizons.angelica.rendering;
+
+import com.gtnewhorizons.angelica.glsm.GLStateManager;
+import lombok.Getter;
+import net.coderbot.iris.layer.GbufferPrograms;
+import net.coderbot.iris.uniforms.CapturedRenderingState;
+import net.coderbot.iris.uniforms.EntityIdHelper;
+import net.minecraft.client.renderer.OpenGlHelper;
+import net.minecraft.client.renderer.entity.RendererLivingEntity;
+import net.minecraft.entity.EntityLivingBase;
+import org.lwjgl.BufferUtils;
+import org.lwjgl.opengl.GL11;
+
+import java.nio.FloatBuffer;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Defers entity overlay rendering (auras, armor effects, etc.) to after all entities have been drawn.
+ * This lets us fix z-fighting between overlay's own coplanar faces by disabling the depth mask,
+ * and ensures the overlay composites correctly on top of all opaque geometry.
+ *
+ * Used by both the charged creeper aura and the Wither armor overlay.
+ *
+ * The deferred render replays shouldRenderPass on the original renderer instance so that any
+ * mod mixins targeting that method still fire during the deferred pass.
+ */
+public class DeferredEntityOverlay {
+
+    @FunctionalInterface
+    public interface ShouldRenderPassFn {
+        int invoke(EntityLivingBase entity, int pass, float partialTick);
+    }
+
+    private static final int INITIAL_CAPACITY = 4;
+    private static final List<DeferredEntry> deferred = new ArrayList<>(INITIAL_CAPACITY);
+    private static final List<DeferredEntry> pool = new ArrayList<>(INITIAL_CAPACITY);
+
+    private static final FloatBuffer MATRIX_BUF = BufferUtils.createFloatBuffer(16);
+
+    // Set by the shouldRenderPass inject, consumed by the doRender WrapOperation.
+    @Getter
+    private static boolean overlayPassActive = false;
+
+    // Set during deferred flush to prevent re-deferring when shouldRenderPass is replayed.
+    @Getter
+    private static boolean replaying = false;
+
+    // Pending context from the shouldRenderPass inject, consumed by deferRender.
+    private static ShouldRenderPassFn pendingShouldRenderPass;
+    private static RendererLivingEntity pendingRenderer;
+    private static EntityLivingBase pendingEntity;
+    private static float pendingPartialTick;
+
+    /**
+     * Called from shouldRenderPass HEAD injects. Marks that the upcoming renderPassModel.render()
+     * should be deferred. If a previous mark was not consumed (shouldRenderPass returned <= 0,
+     * so render() was never called).
+     */
+    public static void markOverlayPass(ShouldRenderPassFn shouldRenderPass, RendererLivingEntity renderer,
+                                    EntityLivingBase entity, float partialTick) {
+        overlayPassActive = true;
+        pendingShouldRenderPass = shouldRenderPass;
+        pendingRenderer = renderer;
+        pendingEntity = entity;
+        pendingPartialTick = partialTick;
+    }
+
+    public static void clearStaleOverlayFlag() {
+        overlayPassActive = false;
+    }
+
+    /**
+     * Called from the WrapOperation on renderPassModel.render() in doRender.
+     * Captures the modelview matrix and animation params, skipping the actual render.
+     */
+    public static void deferRender(float limbSwing, float limbSwingAmount, float ageInTicks,
+                                   float headYaw, float headPitch, float scale) {
+        overlayPassActive = false;
+
+        DeferredEntry entry = acquireEntry();
+        entry.set(pendingShouldRenderPass, pendingRenderer, pendingEntity, pendingPartialTick,
+            limbSwing, limbSwingAmount, ageInTicks, headYaw, headPitch, scale);
+
+        MATRIX_BUF.clear();
+        GLStateManager.glGetFloat(GL11.GL_MODELVIEW_MATRIX, MATRIX_BUF);
+        MATRIX_BUF.get(entry.matrix);
+
+        deferred.add(entry);
+
+        pendingShouldRenderPass = null;
+        pendingRenderer = null;
+        pendingEntity = null;
+    }
+
+    private static DeferredEntry acquireEntry() {
+        int size = pool.size();
+        if (size > 0) {
+            return pool.remove(size - 1);
+        }
+        return new DeferredEntry();
+    }
+
+    private static void recycle() {
+        for (DeferredEntry entry : deferred) {
+            entry.shouldRenderPass = null;
+            entry.renderer = null;
+            entry.entity = null;
+            pool.add(entry);
+        }
+        deferred.clear();
+    }
+
+    public static void clear() {
+        recycle();
+        overlayPassActive = false;
+        replaying = false;
+    }
+
+    public static void renderAll() {
+        if (deferred.isEmpty()) return;
+
+        GbufferPrograms.beginEntities();
+        try {
+            for (DeferredEntry entry : deferred) {
+                CapturedRenderingState.INSTANCE.setCurrentEntity(EntityIdHelper.getEntityId(entry.entity));
+                renderOverlay(entry);
+            }
+        } finally {
+            CapturedRenderingState.INSTANCE.setCurrentEntity(-1);
+            GbufferPrograms.endEntities();
+        }
+        recycle();
+    }
+
+    private static void renderOverlay(DeferredEntry entry) {
+        EntityLivingBase entity = entry.entity;
+
+        // Restore the entity's lightmap coords
+        int brightness = entity.getBrightnessForRender(entry.partialTick);
+        OpenGlHelper.setLightmapTextureCoords(OpenGlHelper.lightmapTexUnit,
+            brightness % 65536, (float) brightness / 65536);
+
+        // Restore the saved modelview matrix
+        GLStateManager.glMatrixMode(GL11.GL_MODELVIEW);
+        GLStateManager.glPushMatrix();
+        boolean depthMaskDisabled = false;
+        try {
+            MATRIX_BUF.clear();
+            MATRIX_BUF.put(entry.matrix);
+            MATRIX_BUF.flip();
+            GLStateManager.glLoadMatrix(MATRIX_BUF);
+
+            // Replay shouldRenderPass pass 1
+            replaying = true;
+            int result = entry.shouldRenderPass.invoke(entity, 1, entry.partialTick);
+            if (result > 0) {
+                // Disable depth writes so coplanar faces don't z-fight each other
+                GLStateManager.glDepthMask(false);
+                depthMaskDisabled = true;
+
+                // Disable backface culling so both sides of the overlay shell are visible
+                GLStateManager.glDisable(GL11.GL_CULL_FACE);
+
+                // Render using the model set by shouldRenderPass
+                entry.renderer.renderPassModel.setLivingAnimations(entity,
+                    entry.limbSwing, entry.limbSwingAmount, entry.partialTick);
+
+                entry.renderer.renderPassModel.render(entity,
+                    entry.limbSwing, entry.limbSwingAmount, entry.ageInTicks,
+                    entry.headYaw, entry.headPitch, entry.scale);
+            }
+
+            // Replay shouldRenderPass pass 2
+            entry.shouldRenderPass.invoke(entity, 2, entry.partialTick);
+        } finally {
+            replaying = false;
+            if (depthMaskDisabled) {
+                GLStateManager.glDepthMask(true);
+                GLStateManager.glEnable(GL11.GL_CULL_FACE);
+            }
+            GLStateManager.glPopMatrix();
+        }
+    }
+
+    private static class DeferredEntry {
+        final float[] matrix = new float[16];
+        ShouldRenderPassFn shouldRenderPass;
+        RendererLivingEntity renderer;
+        EntityLivingBase entity;
+        float partialTick;
+        float limbSwing;
+        float limbSwingAmount;
+        float ageInTicks;
+        float headYaw;
+        float headPitch;
+        float scale;
+
+        void set(ShouldRenderPassFn shouldRenderPass, RendererLivingEntity renderer,
+                 EntityLivingBase entity, float partialTick,
+                 float limbSwing, float limbSwingAmount, float ageInTicks,
+                 float headYaw, float headPitch, float scale) {
+            this.shouldRenderPass = shouldRenderPass;
+            this.renderer = renderer;
+            this.entity = entity;
+            this.partialTick = partialTick;
+            this.limbSwing = limbSwing;
+            this.limbSwingAmount = limbSwingAmount;
+            this.ageInTicks = ageInTicks;
+            this.headYaw = headYaw;
+            this.headPitch = headPitch;
+            this.scale = scale;
+        }
+    }
+}

src/main/java/com/gtnewhorizons/angelica/rendering/ModelHorseArmor.java

@@ -0,0 +1,31 @@
+package com.gtnewhorizons.angelica.rendering;
+
+import net.minecraft.client.model.ModelBox;
+import net.minecraft.client.model.ModelHorse;
+import net.minecraft.client.model.ModelRenderer;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Horse model with all boxes inflated outward, used as a separate armor layer.
+ * Extends ModelHorse to inherit all animation and render logic. The constructor
+ * builds the default geometry, then we rebuild every box with inflate applied.
+ * This mirrors how modern MC uses a separate ModelLayers.HORSE_ARMOR.
+ */
+public class ModelHorseArmor extends ModelHorse {
+
+    public ModelHorseArmor(float inflate) {
+        super();
+        for (ModelRenderer renderer : this.boxList) {
+            List<ModelBox> originalBoxes = new ArrayList<>(renderer.cubeList);
+            renderer.cubeList.clear();
+            for (ModelBox box : originalBoxes) {
+                int width = Math.round(box.posX2 - box.posX1);
+                int height = Math.round(box.posY2 - box.posY1);
+                int depth = Math.round(box.posZ2 - box.posZ1);
+                renderer.addBox(box.posX1, box.posY1, box.posZ1, width, height, depth, inflate);
+            }
+        }
+    }
+}

src/main/java/com/gtnewhorizons/angelica/rendering/StateAwareTessellator.java

@@ -16,4 +16,8 @@ public interface StateAwareTessellator {
     void angelica$setCeleritasMeshing(boolean active);
 
     int[] angelica$getVertexStates();
+
+    int[] angelica$getShaderOverrideBlockIds();
+
+    void angelica$setShaderOverrideBlockId(short blockId);
 }

src/main/java/com/gtnewhorizons/angelica/rendering/TileEntityRenderBoundsRegistry.java

@@ -34,11 +34,13 @@ public final class TileEntityRenderBoundsRegistry {
     }
 
     private static boolean probeAndCache(TileEntity te, Class<? extends TileEntity> clazz) {
-        boolean isInfinite = false;
+        boolean isInfinite;
         try {
             final AxisAlignedBB aabb = te.getRenderBoundingBox();
             isInfinite = isInfiniteExtentsBox(aabb);
-        } catch (Exception ignored) {}
+        } catch (Throwable t) {
+            isInfinite = true;
+        }
 
         synchronized (classRegistry) {
             classRegistry.put(clazz, isInfinite ? INFINITE : FINITE);

src/main/java/com/gtnewhorizons/angelica/rendering/WitherArmorState.java

@@ -0,0 +1,5 @@
+package com.gtnewhorizons.angelica.rendering;
+
+public class WitherArmorState {
+    public static boolean pendingInflate = false;
+}

src/main/java/com/gtnewhorizons/angelica/rendering/celeritas/AngelicaChunkBuildContext.java

@@ -1,11 +1,11 @@
 package com.gtnewhorizons.angelica.rendering.celeritas;
 
-import com.gtnewhorizons.angelica.AngelicaMod;
 import com.gtnewhorizons.angelica.api.ExtQuadLightData;
 import com.gtnewhorizons.angelica.api.TintComputer;
 import com.gtnewhorizons.angelica.api.TintRegistry;
 import com.gtnewhorizons.angelica.dynamiclights.DynamicLights;
 import com.gtnewhorizons.angelica.dynamiclights.IDynamicLightSource;
+import com.gtnewhorizons.angelica.proxy.ClientProxy;
 import com.gtnewhorizons.angelica.rendering.StateAwareTessellator;
 import com.gtnewhorizons.angelica.rendering.celeritas.iris.BlockRenderContext;
 import com.gtnewhorizons.angelica.rendering.celeritas.iris.IrisExtendedChunkVertexEncoder;
@@ -99,7 +99,7 @@ public class AngelicaChunkBuildContext extends ChunkBuildContext {
 
     private Material selectMaterial(Material material, TextureAtlasSprite sprite, boolean isShaderPackOverride) {
         // Don't apply transparency-based optimization when shader pack explicitly overrides the material
-        if (!AngelicaMod.options().performance.useRenderPassOptimization || isShaderPackOverride) {
+        if (!ClientProxy.options().performance.useRenderPassOptimization || isShaderPackOverride) {
             return material;
         }
         if (sprite != null && sprite.getClass() == TextureAtlasSprite.class && !sprite.hasAnimationMetadata()) {
@@ -115,6 +115,7 @@ public class AngelicaChunkBuildContext extends ChunkBuildContext {
 
     @SuppressWarnings("unchecked")
     public void copyRawBuffer(int[] rawBuffer, int vertexCount, int[] vertexStates,
+                              int[] shaderOverrideBlockIds,
                               ChunkBuildBuffers buffers, Material material, boolean isShaderPackOverride,
                               boolean blockAllowsSmoothLighting) {
         if (vertexCount == 0) {
@@ -129,7 +130,7 @@ public class AngelicaChunkBuildContext extends ChunkBuildContext {
 
         final boolean hasDynamicLights = chunkLightSources != null && !chunkLightSources.isEmpty();
         final boolean separateAo = BlockRenderingSettings.INSTANCE.shouldUseSeparateAo();
-        final boolean celeritasSmoothLighting = AngelicaMod.options().quality.useCeleritasSmoothLighting;
+        final boolean celeritasSmoothLighting = ClientProxy.options().quality.useCeleritasSmoothLighting;
         final boolean shaderActive = IrisApi.getInstance().isShaderPackInUse();
         final boolean useAoCalculation = lightPipelineReady && (separateAo || celeritasSmoothLighting || shaderActive);
         final boolean shouldApplyDiffuse = !BlockRenderingSettings.INSTANCE.shouldDisableDirectionalShading();
@@ -145,6 +146,8 @@ public class AngelicaChunkBuildContext extends ChunkBuildContext {
         final int worldY = originY + blockY;
         final int worldZ = originZ + blockZ;
 
+        final short originalBlockId = blockRenderContext.blockId;
+
         int stateIdx = 0;
         int facesAtBaseMaterial = 0;
 
@@ -239,6 +242,9 @@ public class AngelicaChunkBuildContext extends ChunkBuildContext {
             }
             final var builder = buffers.get(correctMaterial);
 
+            final int shaderOverrideBlockId = shaderOverrideBlockIds[quadIdx * 4];
+            blockRenderContext.blockId = shaderOverrideBlockId != -1 ? (short) shaderOverrideBlockId : originalBlockId;
+
             if (correctMaterial != material && builder.getEncoder() instanceof IrisExtendedChunkVertexEncoder iris) {
                 iris.setContext(blockRenderContext);
             }

src/main/java/com/gtnewhorizons/angelica/rendering/celeritas/AngelicaChunkBuilderMeshingTask.java

@@ -20,6 +20,7 @@ import net.minecraft.crash.CrashReport;
 import net.minecraft.crash.CrashReportCategory;
 import net.minecraft.init.Blocks;
 import net.minecraft.tileentity.TileEntity;
+import net.minecraft.util.AxisAlignedBB;
 import net.minecraft.util.ReportedException;
 import net.minecraft.world.IBlockAccess;
 import org.embeddedt.embeddium.impl.render.chunk.RenderSection;
@@ -139,7 +140,25 @@ public abstract class AngelicaChunkBuilderMeshingTask extends ChunkBuilderTask<C
                         if (block.hasTileEntity(meta)) {
                             final TileEntity tileEntity = region.getTileEntity(x, y, z);
                             if (tileEntity != null && TileEntityRendererDispatcher.instance.hasSpecialRenderer(tileEntity)) {
-                                (TileEntityRenderBoundsRegistry.isAlwaysInfiniteExtent(tileEntity) ? renderData.globalBlockEntities : renderData.culledBlockEntities).add(tileEntity);
+                                final boolean isGlobal;
+                                if (TileEntityRenderBoundsRegistry.isAlwaysInfiniteExtent(tileEntity)) {
+                                    isGlobal = true;
+                                } else {
+                                    AxisAlignedBB aabb;
+                                    try {
+                                        aabb = tileEntity.getRenderBoundingBox();
+                                    } catch (Throwable t) {
+                                        aabb = null;
+                                    }
+                                    if (aabb != null) {
+                                        final int secMinX = x & ~15, secMinY = y & ~15, secMinZ = z & ~15;
+                                        isGlobal = aabb.minX < secMinX || aabb.minY < secMinY || aabb.minZ < secMinZ
+                                            || aabb.maxX > secMinX + 16 || aabb.maxY > secMinY + 16 || aabb.maxZ > secMinZ + 16;
+                                    } else {
+                                        isGlobal = true;
+                                    }
+                                }
+                                (isGlobal ? renderData.globalBlockEntities : renderData.culledBlockEntities).add(tileEntity);
                             }
                         }
 
@@ -256,6 +275,7 @@ public abstract class AngelicaChunkBuilderMeshingTask extends ChunkBuilderTask<C
             && block.getLightValue() == 0; // does not emit real block light
         buildContext.copyRawBuffer(tessellator.rawBuffer, tessellator.vertexCount,
             ((StateAwareTessellator)tessellator).angelica$getVertexStates(),
+            ((StateAwareTessellator)tessellator).angelica$getShaderOverrideBlockIds(),
             buffers, passMaterial, isShaderPackOverride, blockAllowsSmoothLighting);
         tessellator.reset();
         tessellator.isDrawing = false;

src/main/java/com/gtnewhorizons/angelica/rendering/celeritas/AngelicaChunkRenderer.java

@@ -2,6 +2,7 @@ package com.gtnewhorizons.angelica.rendering.celeritas;
 
 import com.gtnewhorizons.angelica.AngelicaMod;
 import com.gtnewhorizons.angelica.glsm.GLStateManager;
+import com.gtnewhorizons.angelica.proxy.ClientProxy;
 import com.gtnewhorizons.angelica.rendering.celeritas.api.IrisShaderProvider;
 import com.gtnewhorizons.angelica.rendering.celeritas.api.IrisShaderProviderHolder;
 import me.jellysquid.mods.sodium.client.gui.options.named.MultiDrawMode;
@@ -30,7 +31,7 @@ class AngelicaChunkRenderer extends DefaultChunkRenderer {
     }
 
     private static MultiDrawEmitter createEmitter() {
-        MultiDrawMode mode = AngelicaMod.options().advanced.multiDrawMode;
+        MultiDrawMode mode = ClientProxy.options().advanced.multiDrawMode;
 
         if (mode == MultiDrawMode.INDIRECT) {
             boolean supported = GLStateManager.capabilities != null && (GLStateManager.capabilities.OpenGL43 || GLStateManager.capabilities.GL_ARB_multi_draw_indirect);

src/main/java/com/gtnewhorizons/angelica/rendering/celeritas/AngelicaRenderSectionManager.java

@@ -1,7 +1,7 @@
 package com.gtnewhorizons.angelica.rendering.celeritas;
 
-import com.gtnewhorizons.angelica.AngelicaMod;
 import com.gtnewhorizons.angelica.mixins.interfaces.RenderSectionManagerAccessor;
+import com.gtnewhorizons.angelica.proxy.ClientProxy;
 import com.gtnewhorizons.angelica.rendering.AngelicaRenderQueue;
 import com.gtnewhorizons.angelica.rendering.celeritas.api.IrisShaderProviderHolder;
 import com.gtnewhorizons.angelica.rendering.celeritas.threading.ChunkTaskProvider;
@@ -87,7 +87,7 @@ public class AngelicaRenderSectionManager extends RenderSectionManager {
 
     @Override
     protected AsyncOcclusionMode getAsyncOcclusionMode() {
-        return AngelicaMod.options().performance.asyncOcclusionMode;
+        return ClientProxy.options().performance.asyncOcclusionMode;
     }
 
     @Override
@@ -97,7 +97,7 @@ public class AngelicaRenderSectionManager extends RenderSectionManager {
 
     @Override
     protected boolean useFogOcclusion() {
-        return AngelicaMod.options().performance.useFogOcclusion && !IrisShaderProviderHolder.isActive();
+        return ClientProxy.options().performance.useFogOcclusion && !IrisShaderProviderHolder.isActive();
     }
 
     @Override
@@ -113,7 +113,7 @@ public class AngelicaRenderSectionManager extends RenderSectionManager {
                 return false;
             }
         }
-        return AngelicaMod.options().performance.useOcclusionCulling;
+        return ClientProxy.options().performance.useOcclusionCulling;
     }
 
     @Override
@@ -152,7 +152,7 @@ public class AngelicaRenderSectionManager extends RenderSectionManager {
 
     @Override
     protected boolean allowImportantRebuilds() {
-        return !AngelicaMod.options().performance.alwaysDeferChunkUpdates;
+        return !ClientProxy.options().performance.alwaysDeferChunkUpdates;
     }
 
     @Override

src/main/java/com/gtnewhorizons/angelica/rendering/celeritas/CeleritasDebugScreenHandler.java

@@ -6,7 +6,7 @@ import com.gtnewhorizons.angelica.dynamiclights.DynamicLights;
 import com.gtnewhorizons.angelica.glsm.GLStateManager;
 import static com.gtnewhorizons.angelica.glsm.backend.BackendManager.RENDER_BACKEND;
 import com.gtnewhorizons.angelica.glsm.ffp.ShaderManager;
-import com.gtnewhorizons.angelica.client.rendering.TessellatorStreamingDrawer;
+import com.gtnewhorizons.angelica.glsm.streaming.TessellatorStreamingDrawer;
 import com.gtnewhorizons.angelica.glsm.states.FogState;
 import cpw.mods.fml.common.eventhandler.EventPriority;
 import cpw.mods.fml.common.eventhandler.SubscribeEvent;

src/main/java/com/gtnewhorizons/angelica/rendering/celeritas/CeleritasSetup.java

@@ -2,9 +2,9 @@ package com.gtnewhorizons.angelica.rendering.celeritas;
 
 import com.gtnewhorizons.angelica.config.AngelicaConfig;
 import com.gtnewhorizons.angelica.glsm.GLStateManager;
+import com.gtnewhorizons.angelica.loading.AngelicaClientTweaker;
 import org.embeddedt.embeddium.impl.gl.device.GLRenderDevice;
 import org.lwjgl.opengl.GL15;
-import static com.gtnewhorizons.angelica.loading.AngelicaTweaker.LOGGER;
 
 public class CeleritasSetup {
     private static boolean initialized = false;
@@ -12,7 +12,7 @@ public class CeleritasSetup {
     public static void ensureInitialized() {
         if (!initialized && AngelicaConfig.enableCeleritas) {
             GLRenderDevice.VANILLA_STATE_RESETTER = () -> GLStateManager.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);
-            LOGGER.debug("Celeritas init");
+            AngelicaClientTweaker.LOGGER.debug("Celeritas init");
             initialized = true;
         }
     }

src/main/java/com/gtnewhorizons/angelica/rendering/celeritas/CeleritasWorldRenderer.java

@@ -1,10 +1,10 @@
 package com.gtnewhorizons.angelica.rendering.celeritas;
 
-import com.gtnewhorizons.angelica.AngelicaMod;
 import com.gtnewhorizons.angelica.dynamiclights.DynamicLights;
 import com.gtnewhorizons.angelica.dynamiclights.IDynamicLightWorldRenderer;
 import com.gtnewhorizons.angelica.glsm.GLStateManager;
 import com.gtnewhorizons.angelica.mixins.interfaces.ITileEntityBoundingBoxCache;
+import com.gtnewhorizons.angelica.proxy.ClientProxy;
 import com.gtnewhorizons.angelica.rendering.RenderingState;
 import com.gtnewhorizons.angelica.rendering.TileEntityRenderBoundsRegistry;
 import com.gtnewhorizons.angelica.rendering.celeritas.api.IrisShaderProvider;
@@ -52,10 +52,10 @@ public class CeleritasWorldRenderer extends SimpleWorldRenderer<WorldClient, Ang
     private static final double MAX_ENTITY_CHECK_VOLUME = 16 * 16 * 16 * 15;
 
     // For sorting transparent TESRs
-    private RenderSectionOrderer renderSectionOrderer = new RenderSectionOrderer();
-    private TileEntityOrderer tileEntityOrderer = new TileEntityOrderer();
-    private ArrayList<RenderSection> sortedRenderSections = new ArrayList<>();
-    private ArrayList<TileEntity> sortedTileEntities = new ArrayList<>();
+    private final RenderSectionOrderer renderSectionOrderer = new RenderSectionOrderer();
+    private final TileEntityOrderer tileEntityOrderer = new TileEntityOrderer();
+    private final ArrayList<RenderSection> sortedRenderSections = new ArrayList<>();
+    private final ArrayList<TileEntity> sortedTileEntities = new ArrayList<>();
 
     private CeleritasWorldRenderer(Minecraft mc) {
         // Private constructor for singleton
@@ -92,6 +92,10 @@ public class CeleritasWorldRenderer extends SimpleWorldRenderer<WorldClient, Ang
     @Override
     protected void unloadWorld() {
         DynamicLights.setActiveRenderer(null);
+        this.sortedRenderSections.clear();
+        this.sortedTileEntities.clear();
+        ShadowRenderer.visibleTileEntities.clear();
+        ShadowRenderer.globalTileEntities.clear();
         super.unloadWorld();
     }
 
@@ -127,7 +131,7 @@ public class CeleritasWorldRenderer extends SimpleWorldRenderer<WorldClient, Ang
             }
         }
 
-        if (AngelicaMod.options().performance.useCompactVertexFormat) {
+        if (ClientProxy.options().performance.useCompactVertexFormat) {
             return ChunkMeshFormats.COMPACT;
         }
         return ChunkMeshFormats.VANILLA_LIKE;
@@ -155,7 +159,7 @@ public class CeleritasWorldRenderer extends SimpleWorldRenderer<WorldClient, Ang
 
         renderSectionManager.setCameraPosition(transform.x, transform.y, transform.z);
 
-        this.useEntityCulling = AngelicaMod.options().performance.useEntityCulling;
+        this.useEntityCulling = ClientProxy.options().performance.useEntityCulling;
 
         super.setupTerrain(viewport, cameraState, frame, spectator, updateChunksImmediately);
 
@@ -313,7 +317,7 @@ public class CeleritasWorldRenderer extends SimpleWorldRenderer<WorldClient, Ang
     public int renderBlockEntities(float partialTicks) {
         final int pass = MinecraftForgeClient.getRenderPass();
         teRenderContext.set(partialTicks, pass);
-        if (pass == 0 || !AngelicaMod.options().performance.translucencySorting) {
+        if (pass == 0 || !ClientProxy.options().performance.translucencySorting) {
             return super.renderBlockEntities(teRenderContext);
         }
         int count = 0;

src/main/java/com/gtnewhorizons/angelica/rendering/celeritas/iris/IrisExtendedChunkVertexEncoder.java

@@ -79,13 +79,13 @@ public class IrisExtendedChunkVertexEncoder implements ContextAwareChunkVertexEn
 
         baseEncoder.write(ptr, material, vertex, sectionIndex);
 
-        // Per-vertex: renderType, midBlock, lightValue
-        memPutShort(ptr + MC_ENTITY_OFFSET + 2, ctx.renderType);
+        // Per-vertex: mc_Entity (packed blockId + renderType), midBlock, lightValue
+        memPutInt(ptr + MC_ENTITY_OFFSET, ((ctx.blockId + 1) << 1) | (ctx.renderType & 1));
         final int midBlock = ExtendedDataHelper.computeMidBlock(vertex.x, vertex.y, vertex.z, ctx.localPosX, ctx.localPosY, ctx.localPosZ);
         memPutInt(ptr + MID_BLOCK_OFFSET, midBlock);
         memPutByte(ptr + MID_BLOCK_OFFSET + 3, ctx.lightValue);
 
-        // Per-quad: midTexCoord, blockId, normal, tangent
+        // Per-quad: midTexCoord, normal, tangent
         if (vertexCount == 4) {
             vertexCount = 0;
 
@@ -98,11 +98,6 @@ public class IrisExtendedChunkVertexEncoder implements ContextAwareChunkVertexEn
             memPutInt(ptr + MID_TEX_OFFSET - STRIDE * 2, midUV);
             memPutInt(ptr + MID_TEX_OFFSET - STRIDE * 3, midUV);
 
-            memPutShort(ptr + MC_ENTITY_OFFSET, ctx.blockId);
-            memPutShort(ptr + MC_ENTITY_OFFSET - STRIDE, ctx.blockId);
-            memPutShort(ptr + MC_ENTITY_OFFSET - STRIDE * 2, ctx.blockId);
-            memPutShort(ptr + MC_ENTITY_OFFSET - STRIDE * 3, ctx.blockId);
-
             quad.setup(ptr, STRIDE);
             NormalHelper.computeFaceNormal(normal, quad);
             final int packedNormal = NormI8.pack(normal);