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Paper/Remapped-Spigot-Server-Patches/0478-Reduce-MutableInt-allocations-from-light-engine.patch
2021-06-11 13:56:17 +02:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <spottedleaf@spottedleaf.dev>
Date: Mon, 27 Apr 2020 02:48:06 -0700
Subject: [PATCH] Reduce MutableInt allocations from light engine
We can abuse the fact light is single threaded and share an instance
per light engine instance
diff --git a/src/main/java/net/minecraft/world/level/lighting/BlockLightEngine.java b/src/main/java/net/minecraft/world/level/lighting/BlockLightEngine.java
index 8979101a52537f4ec03a5f43030264b8e72fcea4..709fc42057f8a0282c3c942067e63abb874d9042 100644
--- a/src/main/java/net/minecraft/world/level/lighting/BlockLightEngine.java
+++ b/src/main/java/net/minecraft/world/level/lighting/BlockLightEngine.java
@@ -16,6 +16,7 @@ public final class BlockLightEngine extends LayerLightEngine<BlockLightSectionSt
private static final Direction[] DIRECTIONS = Direction.values();
private final BlockPos.MutableBlockPos pos = new BlockPos.MutableBlockPos();
+ private final MutableInt mutableint = new MutableInt(); // Paper
public BlockLightEngine(LightChunkGetter chunkProvider) {
super(chunkProvider, LightLayer.BLOCK, new BlockLightSectionStorage(chunkProvider));
@@ -47,7 +48,7 @@ public final class BlockLightEngine extends LayerLightEngine<BlockLightSectionSt
if (enumdirection == null) {
return 15;
} else {
- MutableInt mutableint = new MutableInt();
+ //MutableInt mutableint = new MutableInt(); // Paper - share mutableint, single threaded
BlockState iblockdata = this.getStateAndOpacity(targetId, mutableint);
if (mutableint.getValue() >= 15) {
diff --git a/src/main/java/net/minecraft/world/level/lighting/SkyLightEngine.java b/src/main/java/net/minecraft/world/level/lighting/SkyLightEngine.java
index d99890121bdf1e499e364bdc953e628c04d69b95..ff1fbc46776b26ca56c3293e40ed55028230ec46 100644
--- a/src/main/java/net/minecraft/world/level/lighting/SkyLightEngine.java
+++ b/src/main/java/net/minecraft/world/level/lighting/SkyLightEngine.java
@@ -15,6 +15,7 @@ public final class SkyLightEngine extends LayerLightEngine<SkyLightSectionStorag
private static final Direction[] DIRECTIONS = Direction.values();
private static final Direction[] HORIZONTALS = new Direction[]{Direction.NORTH, Direction.SOUTH, Direction.WEST, Direction.EAST};
+ private final MutableInt mutableint = new MutableInt(); // Paper
public SkyLightEngine(LightChunkGetter chunkProvider) {
super(chunkProvider, LightLayer.SKY, new SkyLightSectionStorage(chunkProvider));
@@ -36,7 +37,7 @@ public final class SkyLightEngine extends LayerLightEngine<SkyLightSectionStorag
if (level >= 15) {
return level;
} else {
- MutableInt mutableint = new MutableInt();
+ //MutableInt mutableint = new MutableInt(); // Paper - share mutableint, single threaded
BlockState iblockdata = this.getStateAndOpacity(targetId, mutableint);
if (mutableint.getValue() >= 15) {