Fix WorldClient memory leak in butterfly renderer (#113)

src/main/java/forestry/lepidopterology/render/RenderButterflyItem.java

@@ -25,13 +25,8 @@ import forestry.lepidopterology.entities.EntityButterfly;
 
 public class RenderButterflyItem implements IItemRenderer {
 
-    private final ModelButterfly model;
     private EntityButterfly entity;
 
-    public RenderButterflyItem() {
-        model = new ModelButterfly();
-    }
-
     private static float getWingYaw(IButterfly butterfly) {
         float wingYaw = 1f;
 
@@ -77,11 +72,18 @@ public class RenderButterflyItem implements IItemRenderer {
                     .templateAsIndividual(ButterflyManager.butterflyRoot.getDefaultTemplate());
         }
 
+        try {
             if (entity == null) {
                 entity = new EntityButterfly(Proxies.common.getRenderWorld(), butterfly, 0, 0, 0);
             } else {
+                entity.setWorld(Proxies.common.getRenderWorld());
                 entity.setIndividual(butterfly);
             }
+        } finally {
+            if (entity != null) {
+                entity.setWorld(null);
+            }
+        }
 
         return butterfly;
     }
@@ -111,7 +113,12 @@ public class RenderButterflyItem implements IItemRenderer {
             entity.rotationPitch = 0;
             entity.rotationYawHead = entity.rotationYaw;
 
+            try {
+                entity.setWorld(Proxies.common.getRenderWorld());
                 RenderManager.instance.renderEntityWithPosYaw(entity, 0.0D, 0.0D, 0.0D, 0.0F, 1.0f);
+            } finally {
+                entity.setWorld(null);
+            }
 
         } else {
             GL11.glTranslatef(translateX, translateY, translateZ);
@@ -119,14 +126,19 @@ public class RenderButterflyItem implements IItemRenderer {
             GL11.glScalef(-2.0f, 2.0f, 2.0f);
             GL11.glColor4f(1.0F, 1.0F, 1.0F, 1.0F);
             GL11.glRotatef(-135.0F, 0.0F, 1.0F, 0.0F);
-            GL11.glRotatef(-((float) Math.atan((double) (pitch / 40.0F))) * 20.0F, 1.0F, 0.0F, 0.0F);
+            GL11.glRotatef(-((float) Math.atan(pitch / 40.0F)) * 20.0F, 1.0F, 0.0F, 0.0F);
 
-            entity.renderYawOffset = (float) Math.atan((double) (yaw / 40.0F)) * 20.0F;
-            entity.rotationYaw = (float) Math.atan((double) (yaw / 40.0F)) * 40.0F;
-            entity.rotationPitch = -((float) Math.atan((double) (pitch / 40.0F))) * 20.0F;
+            entity.renderYawOffset = (float) Math.atan(yaw / 40.0F) * 20.0F;
+            entity.rotationYaw = (float) Math.atan(yaw / 40.0F) * 40.0F;
+            entity.rotationPitch = -((float) Math.atan(pitch / 40.0F)) * 20.0F;
             entity.rotationYawHead = entity.rotationYaw;
 
+            try {
+                entity.setWorld(Proxies.common.getRenderWorld());
                 RenderManager.instance.renderEntityWithPosYaw(entity, 0.0D, 0.0D, 0.0D, 0.0F, getWingYaw(butterfly));
+            } finally {
+                entity.setWorld(null);
+            }
         }
 
         GL11.glPopMatrix();
@@ -160,8 +172,12 @@ public class RenderButterflyItem implements IItemRenderer {
         entity.rotationPitch = 0;
         entity.rotationYawHead = entity.rotationYaw;
 
+        try {
+            entity.setWorld(Proxies.common.getRenderWorld());
             RenderManager.instance.renderEntityWithPosYaw(entity, 0.0D, 0.0D, 0.0D, 0.0F, getWingYaw(butterfly));
-
+        } finally {
+            entity.setWorld(null);
+        }
         GL11.glPopMatrix();
         RenderHelper.disableStandardItemLighting();
         GL11.glDisable(GL12.GL_RESCALE_NORMAL);
@@ -173,39 +189,27 @@ public class RenderButterflyItem implements IItemRenderer {
 
     @Override
     public boolean handleRenderType(ItemStack item, ItemRenderType type) {
-        switch (type) {
-            case ENTITY:
-            case EQUIPPED:
-            case EQUIPPED_FIRST_PERSON:
-            case INVENTORY:
-                return true;
-            default:
-                return false;
-        }
+        return switch (type) {
+            case ENTITY, EQUIPPED, EQUIPPED_FIRST_PERSON, INVENTORY -> true;
+            default -> false;
+        };
     }
 
     @Override
     public boolean shouldUseRenderHelper(ItemRenderType type, ItemStack item, ItemRendererHelper helper) {
-        switch (helper) {
-            case ENTITY_BOBBING:
-            case ENTITY_ROTATION:
-                return false;
-            default:
-                return true;
-        }
+        return switch (helper) {
+            case ENTITY_BOBBING, ENTITY_ROTATION -> false;
+            default -> true;
+        };
     }
 
     @Override
     public void renderItem(ItemRenderType type, ItemStack item, Object... data) {
-
         switch (type) {
             case ENTITY:
                 renderButterflyItem(initButterfly(item), 0f, -0.5f, 0f);
                 break;
-            case EQUIPPED:
-                renderButterflyItem(initButterfly(item), 0.5f, -0.9f, 1.0f);
-                break;
-            case EQUIPPED_FIRST_PERSON:
+            case EQUIPPED, EQUIPPED_FIRST_PERSON:
                 renderButterflyItem(initButterfly(item), 0.5f, -0.9f, 1.0f);
                 break;
             case INVENTORY: