From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Paul Sauve <paul@technove.co>
Date: Thu, 4 Feb 2021 23:28:46 -0600
Subject: [PATCH] Cache palette array

The reasoning for reusing it in ChunkRegionLoader is because ThreadLocal
lookups are fairly expensive, and if we put it in DataPaletteBlock the
ThreadLocal lookup would happen 18 times.

Airplane
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diff --git a/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java b/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java
index c9e942669458668a184aaec3bc0a5509dd6ab5f0..178e56ffc87ea2beb4d84d1f278f4acf90102379 100644
--- a/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java
+++ b/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java
@@ -263,13 +263,17 @@ public class PalettedContainer<T> implements PaletteResize<T> {
 
     }
 
+    // Airplane start - allow reusing int array
     public synchronized void write(CompoundTag nbt, String paletteKey, String dataKey) { // Paper - synchronize
+        this.write(nbt, paletteKey, dataKey, new int[4096]);
+    }
+    public synchronized void write(CompoundTag nbt, String paletteKey, String dataKey, int[] is) { // Paper - synchronize // Airplane end
         try {
             this.acquire();
             HashMapPalette<T> hashMapPalette = new HashMapPalette<>(this.registry, this.bits, this.dummyPaletteResize, this.reader, this.writer);
             T object = this.defaultValue;
             int i = hashMapPalette.idFor(this.defaultValue);
-            int[] is = new int[4096];
+            //int[] is = new int[4096]; // Airplane
 
             for(int j = 0; j < 4096; ++j) {
                 T object2 = this.get(j);
diff --git a/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java b/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java
index 7921ee2786d0d6a60d43786b20efc03a0f9178e3..9ea4229f58679c6c833762fc6a50471445ff0b9d 100644
--- a/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java
+++ b/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java
@@ -500,6 +500,7 @@ public class ChunkSerializer {
         return new AsyncSaveData(blockLight, skyLight, blockTickListSerialized, fluidTickListSerialized, blockEntitiesSerialized, world.getGameTime());
     }
 
+    private static final ThreadLocal<int[]> paletteArray = ThreadLocal.withInitial(() -> new int[4096]); // Airplane
     public static CompoundTag write(ServerLevel world, ChunkAccess chunk) {
         return saveChunk(world, chunk, null);
     }
@@ -533,6 +534,7 @@ public class ChunkSerializer {
         ThreadedLevelLightEngine lightenginethreaded = world.getChunkSource().getLightEngine();
         boolean flag = chunk.isLightCorrect();
 
+        int[] is = paletteArray.get(); // Airplane - use cached
         for (int i = lightenginethreaded.getMinLightSection(); i < lightenginethreaded.getMaxLightSection(); ++i) {
             int finalI = i; // CraftBukkit - decompile errors
             LevelChunkSection chunksection = (LevelChunkSection) Arrays.stream(achunksection).filter((chunksection1) -> {
@@ -547,7 +549,7 @@ public class ChunkSerializer {
 
                 nbttagcompound2.putByte("Y", (byte) (i & 255));
                 if (chunksection != LevelChunk.EMPTY_SECTION) {
-                    chunksection.getStates().write(nbttagcompound2, "Palette", "BlockStates");
+                    chunksection.getStates().write(nbttagcompound2, "Palette", "BlockStates", is); // Airplane - reuse array
                 }
 
                 // Paper start - replace light engine