Deduplicate wall block shapes

Author: embeddedt

common/src/main/java/org/embeddedt/modernfix/common/mixin/perf/deduplicate_wall_shapes/WallBlockMixin.java

@@ -0,0 +1,54 @@
+package org.embeddedt.modernfix.common.mixin.perf.deduplicate_wall_shapes;
+
+import com.google.common.collect.ImmutableMap;
+import net.minecraft.world.level.block.Block;
+import net.minecraft.world.level.block.WallBlock;
+import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.level.block.state.StateDefinition;
+import net.minecraft.world.level.block.state.properties.Property;
+import net.minecraft.world.phys.shapes.VoxelShape;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Map;
+
+@Mixin(WallBlock.class)
+public abstract class WallBlockMixin extends Block {
+    private static Map<ImmutableMap<Property<?>, Comparable<?>>, VoxelShape> CACHE_BY_PROPERTIES = new HashMap<>();
+    private static StateDefinition<Block, BlockState> CACHED_DEFINITION = null;
+    private static float[] CACHED_FLOATS = null;
+
+    public WallBlockMixin(Properties properties) {
+        super(properties);
+    }
+
+    @Inject(method = "makeShapes", at = @At("HEAD"), cancellable = true)
+    private synchronized void useCachedShapeMap(float f1, float f2, float f3, float f4, float f5, float f6, CallbackInfoReturnable<Map<BlockState, VoxelShape>> cir) {
+        if(CACHED_DEFINITION != null) {
+            // check if this state container's properties exactly match the one we used for the cache
+            if(CACHED_DEFINITION.getProperties().equals(this.stateDefinition.getProperties()) && Arrays.equals(CACHED_FLOATS, new float[] { f1, f2, f3, f4, f5, f6 })) {
+                ImmutableMap.Builder<BlockState, VoxelShape> builder = ImmutableMap.builder();
+                for(BlockState state : this.stateDefinition.getPossibleStates()) {
+                    builder.put(state, CACHE_BY_PROPERTIES.get(state.getValues()));
+                }
+                cir.setReturnValue(builder.build());
+            }
+        }
+    }
+
+    @Inject(method = "makeShapes", at = @At("RETURN"))
+    private synchronized void storeCachedShapesByProperty(float f1, float f2, float f3, float f4, float f5, float f6, CallbackInfoReturnable<Map<BlockState, VoxelShape>> cir) {
+        if(CACHE_BY_PROPERTIES.size() == 0) {
+            Map<BlockState, VoxelShape> shapeMap = cir.getReturnValue();
+            for(Map.Entry<BlockState, VoxelShape> entry : shapeMap.entrySet()) {
+                CACHE_BY_PROPERTIES.put(entry.getKey().getValues(), entry.getValue());
+            }
+            CACHED_FLOATS = new float[] { f1, f2, f3, f4, f5, f6 };
+            CACHED_DEFINITION = this.stateDefinition;
+        }
+    }
+}

common/src/main/java/org/embeddedt/modernfix/core/config/ModernFixEarlyConfig.java

@@ -226,6 +226,8 @@ private ModernFixEarlyConfig(File file) {
         disableIfModPresent("mixin.bugfix.remove_block_chunkloading", "performant");
         disableIfModPresent("mixin.bugfix.paper_chunk_patches", "c2me");
         disableIfModPresent("mixin.perf.cache_strongholds", "littletiles");
+        // content overlap
+        disableIfModPresent("mixin.perf.deduplicate_wall_shapes", "dashloader");
         disableIfModPresent("mixin.perf.nbt_memory_usage", "c2me");
         // DimThread makes changes to the server chunk manager (understandably), C2ME probably does the same
         disableIfModPresent("mixin.bugfix.chunk_deadlock", "c2me", "dimthread");