Paper/patches/server/0920-Add-getChunkSnapshot-includeLightData-parameter.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Warrior <50800980+Warriorrrr@users.noreply.github.com>
Date: Sat, 10 Feb 2024 10:03:48 +0100
Subject: [PATCH] Add getChunkSnapshot includeLightData parameter


diff --git a/src/main/java/org/bukkit/craftbukkit/CraftChunk.java b/src/main/java/org/bukkit/craftbukkit/CraftChunk.java
index 887a17a0833064eb5701222e5fb6f5ccf9511588..5fc9e8e969debb3e15ed474b36a1c48b086d0449 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftChunk.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftChunk.java
@@ -328,12 +328,21 @@ public class CraftChunk implements Chunk {
 
     @Override
     public ChunkSnapshot getChunkSnapshot(boolean includeMaxBlockY, boolean includeBiome, boolean includeBiomeTempRain) {
+        // Paper start - Add getChunkSnapshot includeLightData parameter
+        return getChunkSnapshot(includeMaxBlockY, includeBiome, includeBiomeTempRain, true);
+    }
+
+    @Override
+    public ChunkSnapshot getChunkSnapshot(boolean includeMaxBlockY, boolean includeBiome, boolean includeBiomeTempRain, boolean includeLightData) {
+        // Paper end - Add getChunkSnapshot includeLightData parameter
         ChunkAccess chunk = this.getHandle(ChunkStatus.FULL);
 
         LevelChunkSection[] cs = chunk.getSections();
         PalettedContainer[] sectionBlockIDs = new PalettedContainer[cs.length];
-        byte[][] sectionSkyLights = new byte[cs.length][];
-        byte[][] sectionEmitLights = new byte[cs.length][];
+        // Paper start - Add getChunkSnapshot includeLightData parameter
+        byte[][] sectionSkyLights = includeLightData ? new byte[cs.length][] : null;
+        byte[][] sectionEmitLights = includeLightData ? new byte[cs.length][] : null;
+        // Paper end - Add getChunkSnapshot includeLightData parameter
         boolean[] sectionEmpty = new boolean[cs.length];
         PalettedContainerRO<Holder<net.minecraft.world.level.biome.Biome>>[] biome = (includeBiome || includeBiomeTempRain) ? new PalettedContainer[cs.length] : null;
 
@@ -350,6 +359,7 @@ public class CraftChunk implements Chunk {
             }
             // Paper end - Fix ChunkSnapshot#isSectionEmpty(int)
 
+            if (includeLightData) { // Paper - Add getChunkSnapshot includeLightData parameter
             LevelLightEngine lightengine = this.worldServer.getLightEngine();
             DataLayer skyLightArray = lightengine.getLayerListener(LightLayer.SKY).getDataLayerData(SectionPos.of(this.x, chunk.getSectionYFromSectionIndex(i), this.z)); // SPIGOT-7498: Convert section index
             if (skyLightArray == null) {
@@ -365,6 +375,7 @@ public class CraftChunk implements Chunk {
                 sectionEmitLights[i] = new byte[2048];
                 System.arraycopy(emitLightArray.getData(), 0, sectionEmitLights[i], 0, 2048);
             }
+            } // Paper - Add getChunkSnapshot includeLightData parameter
 
             if (biome != null) {
                 biome[i] = ((PalettedContainer<Holder<net.minecraft.world.level.biome.Biome>>) cs[i].getBiomes()).copy(); // Paper - Perf: use copy instead of round tripping with codecs
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftChunkSnapshot.java b/src/main/java/org/bukkit/craftbukkit/CraftChunkSnapshot.java
index c88e4ba701b2a2325b76478b7f47278157afd2ef..ddcbdbcbfeb6efe0a587b1181505423cc9d2c951 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftChunkSnapshot.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftChunkSnapshot.java
@@ -119,6 +119,7 @@ public class CraftChunkSnapshot implements ChunkSnapshot {
 
     @Override
     public final int getBlockSkyLight(int x, int y, int z) {
+        Preconditions.checkState(this.skylight != null, "ChunkSnapshot created without light data. Please call getSnapshot with includeLightData=true"); // Paper - Add getChunkSnapshot includeLightData parameter
         this.validateChunkCoordinates(x, y, z);
 
         int off = ((y & 0xF) << 7) | (z << 3) | (x >> 1);
@@ -127,6 +128,7 @@ public class CraftChunkSnapshot implements ChunkSnapshot {
 
     @Override
     public final int getBlockEmittedLight(int x, int y, int z) {
+        Preconditions.checkState(this.emitlight != null, "ChunkSnapshot created without light data. Please call getSnapshot with includeLightData=true"); // Paper - Add getChunkSnapshot includeLightData parameter
         this.validateChunkCoordinates(x, y, z);
 
         int off = ((y & 0xF) << 7) | (z << 3) | (x >> 1);