perf: use ThreadLocal shape cache

c2me-opts-worldgen-vanilla/src/main/java/com/ishland/c2me/opts/worldgen/vanilla/mixin/tlcache/MixinBlock.java

@@ -0,0 +1,45 @@
+package com.ishland.c2me.opts.worldgen.vanilla.mixin.tlcache;
+
+import it.unimi.dsi.fastutil.objects.Object2BooleanLinkedOpenHashMap;
+import net.minecraft.block.Block;
+import net.minecraft.util.function.BooleanBiFunction;
+import net.minecraft.util.shape.VoxelShape;
+import net.minecraft.util.shape.VoxelShapes;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Overwrite;
+import org.spongepowered.asm.mixin.Unique;
+
+@Mixin(Block.class)
+public class MixinBlock {
+
+    @Unique
+    private static final ThreadLocal<Object2BooleanLinkedOpenHashMap<VoxelShape>> c2me$full_cube_shape_cache_tl =
+            ThreadLocal.withInitial(() -> new Object2BooleanLinkedOpenHashMap<>(256, 0.25F) {
+                @Override
+                protected void rehash(int newN) {
+                    if (newN > n) {
+                        super.rehash(newN);
+                    }
+                }
+            });
+
+    /**
+     * @author ishland
+     * @reason use ThreadLocal cache
+     */
+    @Overwrite
+    public static boolean isShapeFullCube(VoxelShape shape) {
+        Object2BooleanLinkedOpenHashMap<VoxelShape> map = c2me$full_cube_shape_cache_tl.get();
+        if (map.containsKey(shape)) {
+            return map.getAndMoveToFirst(shape);
+        } else {
+            boolean uncached = !VoxelShapes.matchesAnywhere(VoxelShapes.fullCube(), shape, BooleanBiFunction.NOT_SAME);
+            if (map.size() >= 256) {
+                map.removeLastBoolean();
+            }
+            map.putAndMoveToFirst(shape, uncached);
+            return uncached;
+        }
+    }
+
+}

c2me-opts-worldgen-vanilla/src/main/resources/c2me-opts-worldgen-vanilla.mixins.json

@@ -7,6 +7,7 @@
     "aquifer.MixinAquiferSamplerImpl",
     "aquifer.MixinNoiseChunkGenerator",
     "structure_weight_sampler.MixinStructureWeightSampler",
-    "the_end_biome_cache.MixinTheEndBiomeSource"
+    "the_end_biome_cache.MixinTheEndBiomeSource",
+    "tlcache.MixinBlock"
   ]
 }