1 files changed, 61 insertions, 0 deletions
diff --git a/patches/server/0318-Optimise-Chunk-getFluid.patch b/patches/server/0318-Optimise-Chunk-getFluid.patch
new file mode 100644
index 0000000000..05f68c017f
--- /dev/null
+++ b/patches/server/0318-Optimise-Chunk-getFluid.patch
@@ -0,0 +1,61 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Spottedleaf <[email protected]>
+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 31696856600db18d1dc401b7fa72a7c9ff219304..b6fb9014d0e4de35b0f5a7e9e99f9db7ec89edcd 100644
+--- a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
++++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
+@@ -298,18 +298,20 @@ 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");
+@@ -319,6 +321,7 @@ 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 771529ba28a16664ad19ed9c0f4bf95eeb7da76b..52f44f14bbda60fe771c351e01e6ff470d7371e6 100644
+--- a/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java
++++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java
+@@ -49,7 +49,7 @@ 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() {