fix world client leaks in bop fog handlers (#2056)

src/main/java/com/gtnewhorizons/angelica/compat/bop/BopFogColorSource.java

@@ -17,6 +17,10 @@ public final class BopFogColorSource implements BopFogBlend.ColorSource {
         return this;
     }
 
+    public void freeWorld() {
+        this.world = null;
+    }
+
     @Override
     public int fogColour(int x, int y, int z) {
         final BiomeGenBase biome = FogBiomeCache.get(world, x, z);

src/main/java/com/gtnewhorizons/angelica/compat/bop/FogBiomeCache.java

@@ -9,7 +9,7 @@ public final class FogBiomeCache {
     private static final int MAX_ENTRIES = 16384;
 
     private static final Long2ObjectOpenHashMap<BiomeGenBase> CACHE = new Long2ObjectOpenHashMap<>();
-    private static World lastWorld;
+    private static World cachedWorld;
     private static int generation;
 
     private FogBiomeCache() {}
@@ -18,10 +18,14 @@ public final class FogBiomeCache {
         return generation;
     }
 
+    public static void invalidate() {
+        cachedWorld = null;
+    }
+
     public static BiomeGenBase get(World world, int x, int z) {
-        if (world != lastWorld) {
+        if (world != cachedWorld) {
             CACHE.clear();
-            lastWorld = world;
+            cachedWorld = world;
             generation++;
         }
         final long key = ((long) x << 32) | (z & 0xFFFFFFFFL);

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

@@ -6,6 +6,8 @@ import java.util.Comparator;
 import java.util.Iterator;
 import java.util.List;
 
+import com.gtnewhorizons.angelica.compat.bop.BopFogBlend;
+import com.gtnewhorizons.angelica.compat.bop.FogBiomeCache;
 import net.minecraft.client.Minecraft;
 import net.minecraft.client.multiplayer.WorldClient;
 import net.minecraft.client.renderer.tileentity.TileEntityRendererDispatcher;
@@ -166,6 +168,8 @@ public class CeleritasWorldRenderer extends SimpleWorldRenderer<WorldClient, Ang
         TesrBatchRenderer.INSTANCE.clearRetained();
         ModelPartBatcher.INSTANCE.clear();
         GpuCulling.onWorldUnload();
+        BopFogBlend.invalidate();
+        FogBiomeCache.invalidate();
         super.unloadWorld();
     }
 

src/mixin/java/com/gtnewhorizons/angelica/mixins/late/client/biomesoplenty/MixinFogHandlerBiomeCache.java

@@ -52,6 +52,7 @@ public class MixinFogHandlerBiomeCache {
         final float[] sums = angelica$sums;
         BopFogBlend.accumulate(world, FogBiomeCache.generation(), BopFogColorSource.INSTANCE.forWorld(world),
             playerEntity.posX, playerEntity.posZ, playerX, playerY, playerZ, distance, sums);
+        BopFogColorSource.INSTANCE.freeWorld();
 
         float rBiomeFog = sums[0];
         float gBiomeFog = sums[1];