Leaf/leaf-server/minecraft-patches/features/0281-optimize-LevelChunk-getBlockStateFinal.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: hayanesuru <hayanesuru@outlook.jp>
Date: Sat, 9 Aug 2025 15:00:20 +0900
Subject: [PATCH] optimize LevelChunk#getBlockStateFinal


diff --git a/net/minecraft/world/level/chunk/LevelChunk.java b/net/minecraft/world/level/chunk/LevelChunk.java
index 833684b30214566ba27438a1dfb48fbe9f1e6c67..a82049aabcdb64f4632c707ee1d48a885da4301a 100644
--- a/net/minecraft/world/level/chunk/LevelChunk.java
+++ b/net/minecraft/world/level/chunk/LevelChunk.java
@@ -316,12 +316,18 @@ public class LevelChunk extends ChunkAccess implements ca.spottedleaf.moonrise.p
 
     public BlockState getBlockStateFinal(final int x, final int y, final int z) {
         // Copied and modified from below
-        final int sectionIndex = this.getSectionIndex(y);
-        if (sectionIndex < 0 || sectionIndex >= this.sections.length
-            || this.sections[sectionIndex].nonEmptyBlockCount == 0) {
-            return Blocks.AIR.defaultBlockState();
+        // Leaf start - optimize LevelChunk#getBlockStateFinal
+        final int sectionIndex = (y >> 4) - this.minSection;
+        if (sectionIndex < 0 || sectionIndex >= this.sections.length) {
+            return AIR_BLOCKSTATE;
+        } else {
+            LevelChunkSection section = this.sections[sectionIndex];
+            if (section.nonEmptyBlockCount == 0) {
+                return AIR_BLOCKSTATE;
+            }
+            return section.states.get((y & 15) << 8 | (z & 15) << 4 | x & 15);
         }
-        return this.sections[sectionIndex].states.get((y & 15) << 8 | (z & 15) << 4 | x & 15);
+        // Leaf end - optimize LevelChunk#getBlockStateFinal
     }
 
     @Override