From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: NONPLAYT <76615486+NONPLAYT@users.noreply.github.com>
Date: Tue, 28 Jan 2025 01:14:58 +0300
Subject: [PATCH] Threaded light engine


diff --git a/net/minecraft/server/level/ChunkMap.java b/net/minecraft/server/level/ChunkMap.java
index b3f498558614243cf633dcd71e3c49c2c55e6e0f..da2921268a9aa4545a12c155a33bed9fccb4f19c 100644
--- a/net/minecraft/server/level/ChunkMap.java
+++ b/net/minecraft/server/level/ChunkMap.java
@@ -212,7 +212,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
         ConsecutiveExecutor consecutiveExecutor = new ConsecutiveExecutor(dispatcher, "worldgen");
         this.progressListener = progressListener;
         this.chunkStatusListener = chunkStatusListener;
-        ConsecutiveExecutor consecutiveExecutor1 = new ConsecutiveExecutor(dispatcher, "light");
+        ConsecutiveExecutor consecutiveExecutor1 = onLightExecutorInit(ConsecutiveExecutor::new); // DivineMC - Threaded light engine
         // Paper - rewrite chunk system
         this.lightEngine = new ThreadedLevelLightEngine(
             lightChunk, this, this.level.dimensionType().hasSkyLight(), consecutiveExecutor1, null // Paper - rewrite chunk system
@@ -232,6 +232,20 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
         this.worldGenContext = new WorldGenContext(level, generator, structureManager, this.lightEngine, null, this::setChunkUnsaved); // Paper - rewrite chunk system
     }
 
+    // DivineMC start - Threaded light engine
+    private java.util.concurrent.ExecutorService lightThread = null;
+
+    private ConsecutiveExecutor onLightExecutorInit(java.util.function.BiFunction<java.util.concurrent.Executor, String, net.minecraft.util.thread.ConsecutiveExecutor> original) {
+        lightThread = new java.util.concurrent.ThreadPoolExecutor(
+            1, 1,
+            0, java.util.concurrent.TimeUnit.SECONDS,
+            new java.util.concurrent.LinkedBlockingQueue<>(),
+            new com.google.common.util.concurrent.ThreadFactoryBuilder().setPriority(Thread.NORM_PRIORITY - 1).setDaemon(true).setNameFormat(String.format("%s - Light", level.dimension().location().toDebugFileName())).build()
+        );
+        return original.apply(lightThread, "light");
+    }
+    // DivineMC end - Threaded light engine
+
     private void setChunkUnsaved(ChunkPos chunkPos) {
         // Paper - rewrite chunk system
     }