From 29bd57b4c8f3b2a1aa2263244e65ebcf6c3f876d Mon Sep 17 00:00:00 2001
From: Jason <11360596+jpenilla@users.noreply.github.com>
Date: Sat, 11 Dec 2021 17:50:45 -0800
Subject: [PATCH] Remove codec usage in chunk snapshot creation (#7093)

---
 ...t-isSectionEmpty-int-and-optimize-Pa.patch | 44 +++++++++++++++++++
 ...Fix-ChunkSnapshot-isSectionEmpty-int.patch | 26 -----------
 2 files changed, 44 insertions(+), 26 deletions(-)
 create mode 100644 patches/server/0828-Fix-ChunkSnapshot-isSectionEmpty-int-and-optimize-Pa.patch
 delete mode 100644 patches/server/0828-Fix-ChunkSnapshot-isSectionEmpty-int.patch

diff --git a/patches/server/0828-Fix-ChunkSnapshot-isSectionEmpty-int-and-optimize-Pa.patch b/patches/server/0828-Fix-ChunkSnapshot-isSectionEmpty-int-and-optimize-Pa.patch
new file mode 100644
index 0000000000..6f7e30efa6
--- /dev/null
+++ b/patches/server/0828-Fix-ChunkSnapshot-isSectionEmpty-int-and-optimize-Pa.patch
@@ -0,0 +1,44 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Jason Penilla <11360596+jpenilla@users.noreply.github.com>
+Date: Thu, 9 Dec 2021 00:08:11 -0800
+Subject: [PATCH] Fix ChunkSnapshot#isSectionEmpty(int) and optimize
+ PalettedContainer copying by not using codecs
+
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/CraftChunk.java b/src/main/java/org/bukkit/craftbukkit/CraftChunk.java
+index db344e5b9f96f317a232304587e6b1673fc6067d..d51476ca2aad08a0dd93a2e772dd7750afc939dc 100644
+--- a/src/main/java/org/bukkit/craftbukkit/CraftChunk.java
++++ b/src/main/java/org/bukkit/craftbukkit/CraftChunk.java
+@@ -280,14 +280,17 @@ public class CraftChunk implements Chunk {
+         boolean[] sectionEmpty = new boolean[cs.length];
+         PalettedContainer<Biome>[] biome = (includeBiome || includeBiomeTempRain) ? new PalettedContainer[cs.length] : null;
+ 
+-        Registry<Biome> iregistry = this.worldServer.registryAccess().registryOrThrow(Registry.BIOME_REGISTRY);
+-        Codec<PalettedContainer<Biome>> biomeCodec = PalettedContainer.codec(iregistry, iregistry.byNameCodec(), PalettedContainer.Strategy.SECTION_BIOMES, iregistry.getOrThrow(Biomes.PLAINS), null); // Paper - Anti-Xray - Add preset biomes
+ 
+         for (int i = 0; i < cs.length; i++) {
+-            CompoundTag data = new CompoundTag();
+ 
+-            data.put("block_states", ChunkSerializer.BLOCK_STATE_CODEC.encodeStart(NbtOps.INSTANCE, cs[i].getStates()).get().left().get());
+-            sectionBlockIDs[i] = ChunkSerializer.BLOCK_STATE_CODEC.parse(NbtOps.INSTANCE, data.getCompound("block_states")).get().left().get();
++            // Paper start
++            sectionEmpty[i] = cs[i].hasOnlyAir(); // Paper - fix sectionEmpty array not being filled
++            if (!sectionEmpty[i]) {
++                sectionBlockIDs[i] = cs[i].getStates().copy(); // Paper - use copy instead of round tripping with codecs
++            } else {
++                sectionBlockIDs[i] = CraftChunk.emptyBlockIDs; // Paper - use cached instance for empty block sections
++            }
++            // Paper end
+ 
+             LevelLightEngine lightengine = chunk.level.getLightEngine();
+             DataLayer skyLightArray = lightengine.getLayerListener(LightLayer.SKY).getDataLayerData(SectionPos.of(x, i, z));
+@@ -306,8 +309,7 @@ public class CraftChunk implements Chunk {
+             }
+ 
+             if (biome != null) {
+-                data.put("biomes", biomeCodec.encodeStart(NbtOps.INSTANCE, cs[i].getBiomes()).get().left().get());
+-                biome[i] = biomeCodec.parse(NbtOps.INSTANCE, data.getCompound("biomes")).get().left().get();
++                biome[i] = cs[i].getBiomes().copy(); // Paper - use copy instead of round tripping with codecs
+             }
+         }
+ 
diff --git a/patches/server/0828-Fix-ChunkSnapshot-isSectionEmpty-int.patch b/patches/server/0828-Fix-ChunkSnapshot-isSectionEmpty-int.patch
deleted file mode 100644
index 8b84bbcaa0..0000000000
--- a/patches/server/0828-Fix-ChunkSnapshot-isSectionEmpty-int.patch
+++ /dev/null
@@ -1,26 +0,0 @@
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: Jason Penilla <11360596+jpenilla@users.noreply.github.com>
-Date: Thu, 9 Dec 2021 00:08:11 -0800
-Subject: [PATCH] Fix ChunkSnapshot#isSectionEmpty(int)
-
-
-diff --git a/src/main/java/org/bukkit/craftbukkit/CraftChunk.java b/src/main/java/org/bukkit/craftbukkit/CraftChunk.java
-index db344e5b9f96f317a232304587e6b1673fc6067d..b4f7b91ac165e3171ffcf7d6a993af248d268959 100644
---- a/src/main/java/org/bukkit/craftbukkit/CraftChunk.java
-+++ b/src/main/java/org/bukkit/craftbukkit/CraftChunk.java
-@@ -286,8 +286,15 @@ public class CraftChunk implements Chunk {
-         for (int i = 0; i < cs.length; i++) {
-             CompoundTag data = new CompoundTag();
- 
-+            // Paper start
-+            sectionEmpty[i] = cs[i].hasOnlyAir();
-+            if (!sectionEmpty[i]) {
-             data.put("block_states", ChunkSerializer.BLOCK_STATE_CODEC.encodeStart(NbtOps.INSTANCE, cs[i].getStates()).get().left().get());
-             sectionBlockIDs[i] = ChunkSerializer.BLOCK_STATE_CODEC.parse(NbtOps.INSTANCE, data.getCompound("block_states")).get().left().get();
-+            } else {
-+                sectionBlockIDs[i] = CraftChunk.emptyBlockIDs;
-+            }
-+            // Paper end
- 
-             LevelLightEngine lightengine = chunk.level.getLightEngine();
-             DataLayer skyLightArray = lightengine.getLayerListener(LightLayer.SKY).getDataLayerData(SectionPos.of(x, i, z));