Add accessor to BlockEntityRenderer map.

src/main/java/com/jozufozu/flywheel/mixin/BlockEntityRenderDispatcherAccessor.java

@@ -0,0 +1,16 @@
+package com.jozufozu.flywheel.mixin;
+
+import java.util.Map;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.gen.Accessor;
+
+import net.minecraft.client.renderer.blockentity.BlockEntityRenderDispatcher;
+import net.minecraft.client.renderer.blockentity.BlockEntityRenderer;
+import net.minecraft.world.level.block.entity.BlockEntityType;
+
+@Mixin(BlockEntityRenderDispatcher.class)
+public interface BlockEntityRenderDispatcherAccessor {
+	@Accessor("renderers")
+	Map<BlockEntityType<?>, BlockEntityRenderer<?>> flywheel$getRenderers();
+}

src/main/java/com/jozufozu/flywheel/util/FlwUtil.java

@@ -1,9 +1,25 @@
 package com.jozufozu.flywheel.util;
 
 import java.util.Arrays;
+import java.util.Map;
+
+import com.jozufozu.flywheel.mixin.BlockEntityRenderDispatcherAccessor;
+
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.renderer.blockentity.BlockEntityRenderer;
+import net.minecraft.world.level.block.entity.BlockEntityType;
 
 public class FlwUtil {
 
+	/**
+	 * Get the (effectively global) map of BlockEntityTypes to Renderers.
+	 * @return An immutable map of BlockEntityTypes to BlockEntityRenderers.
+	 */
+	public static Map<BlockEntityType<?>, BlockEntityRenderer<?>> getBlockEntityRenderers() {
+		Minecraft mc = Minecraft.getInstance();
+		return ((BlockEntityRenderDispatcherAccessor) mc.getBlockEntityRenderDispatcher()).flywheel$getRenderers();
+	}
+
 	public static String repeatChar(char c, int n) {
 		char[] arr = new char[n];
 

src/main/resources/flywheel.mixins.json

@@ -5,6 +5,7 @@
   "compatibilityLevel": "JAVA_17",
   "refmap": "flywheel.refmap.json",
   "client": [
+    "BlockEntityRenderDispatcherAccessor",
     "BlockEntityTypeMixin",
     "BufferBuilderMixin",
     "BufferUploaderMixin",