Paper/patches/server/0326-Optimise-Chunk-getFluid.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Tue, 14 Jan 2020 14:59:08 -0800
Subject: [PATCH] Optimise Chunk#getFluid

Removing the try catch and generally reducing ops should make it
faster on its own, however removing the try catch makes it
easier to inline due to code size

diff --git a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
index 9a94b0513e8b75c8acf0117bc0fbf563655ec3d8..46a5d9270aaaccb2df7131fb9c921cccf914085c 100644
--- a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
+++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
@@ -369,18 +369,20 @@ public class LevelChunk extends ChunkAccess {
     }
 
     public FluidState getFluidState(int x, int y, int z) {
-        try {
-            int l = this.getSectionIndex(y);
-
-            if (l >= 0 && l < this.sections.length) {
-                LevelChunkSection chunksection = this.sections[l];
+        // Paper start - Perf: Optimise Chunk#getFluid
+        // try {  // Remove try catch
+        int index = this.getSectionIndex(y);
+            if (index >= 0 && index < this.sections.length) {
+                LevelChunkSection chunksection = this.sections[index];
 
                 if (!chunksection.hasOnlyAir()) {
-                    return chunksection.getFluidState(x & 15, y & 15, z & 15);
+                    return chunksection.states.get((y & 15) << 8 | (z & 15) << 4 | x & 15).getFluidState();
+                    // Paper end - Perf: Optimise Chunk#getFluid
                 }
             }
 
             return Fluids.EMPTY.defaultFluidState();
+        /* // Paper - Perf: Optimise Chunk#getFluid
         } catch (Throwable throwable) {
             CrashReport crashreport = CrashReport.forThrowable(throwable, "Getting fluid state");
             CrashReportCategory crashreportsystemdetails = crashreport.addCategory("Block being got");
@@ -390,6 +392,7 @@ public class LevelChunk extends ChunkAccess {
             });
             throw new ReportedException(crashreport);
         }
+         */  // Paper - Perf: Optimise Chunk#getFluid
     }
 
     // CraftBukkit start
diff --git a/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java b/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java
index 2c153af611399e884752f8256bee4fe32de5c572..90d1c3e23e753c29660f7d993b3c90ac022941c3 100644
--- a/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java
+++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java
@@ -43,7 +43,7 @@ public class LevelChunkSection {
     }
 
     public FluidState getFluidState(int x, int y, int z) {
-        return ((BlockState) this.states.get(x, y, z)).getFluidState();
+        return this.states.get(x, y, z).getFluidState(); // Paper - Perf: Optimise Chunk#getFluid; diff on change - we expect this to be effectively just getType(x, y, z).getFluid(). If this changes we need to check other patches that use IBlockData#getFluid.
     }
 
     public void acquire() {