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 afc443f36b26e9493fa0a530891b2edd7f3f6703..797d9d0d81f026479dda1ab4d72793025272a0f7 100644
--- a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
+++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
@@ -427,18 +427,20 @@ 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];
+        // try {  // Paper - remove try catch
+        // Paper start - reduce the number of ops in this call
+        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
                 }
             }
 
             return Fluids.EMPTY.defaultFluidState();
+        /* // Paper - remove try catch
         } catch (Throwable throwable) {
             CrashReport crashreport = CrashReport.forThrowable(throwable, "Getting fluid state");
             CrashReportCategory crashreportsystemdetails = crashreport.addCategory("Block being got");
@@ -448,6 +450,7 @@ public class LevelChunk extends ChunkAccess {
             });
             throw new ReportedException(crashreport);
         }
+         */  // Paper - remove try catch
     }
 
     // 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 785fbcf9bafcdec1c5be213de3d8512690023415..066874d27495dcaa3dea254b7328257e46920357 100644
--- a/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java
+++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java
@@ -54,7 +54,7 @@ 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 - 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() {