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

paper-server/patches/sources/net/minecraft/world/level/chunk/LevelChunk.java.patch

@@ -86,7 +86,7 @@
          int i = pos.getX();
          int j = pos.getY();
          int k = pos.getZ();
-@@ -243,7 +280,19 @@
+@@ -243,24 +280,38 @@
          }
      }
  
@@ -106,8 +106,36 @@
      public FluidState getFluidState(BlockPos pos) {
          return this.getFluidState(pos.getX(), pos.getY(), pos.getZ());
      }
-@@ -272,78 +321,86 @@
+ 
+     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");
+@@ -270,80 +321,89 @@
+             });
+             throw new ReportedException(crashreport);
          }
++         */  // Paper - Perf: Optimise Chunk#getFluid
      }
  
 +    // CraftBukkit start
@@ -218,7 +246,7 @@
                              this.updateBlockEntityTicker(tileentity);
                          }
                      }
-@@ -375,7 +432,12 @@
+@@ -375,7 +435,12 @@
  
      @Nullable
      public BlockEntity getBlockEntity(BlockPos pos, LevelChunk.EntityCreationType creationType) {
@@ -232,7 +260,7 @@
  
          if (tileentity == null) {
              CompoundTag nbttagcompound = (CompoundTag) this.pendingBlockEntities.remove(pos);
-@@ -446,7 +508,13 @@
+@@ -446,7 +511,13 @@
          BlockState iblockdata = this.getBlockState(blockposition);
  
          if (!iblockdata.hasBlockEntity()) {
@@ -247,7 +275,7 @@
          } else {
              BlockState iblockdata1 = blockEntity.getBlockState();
  
-@@ -500,6 +568,12 @@
+@@ -500,6 +571,12 @@
          if (this.isInLevel()) {
              BlockEntity tileentity = (BlockEntity) this.blockEntities.remove(pos);
  
@@ -260,10 +288,14 @@
              if (tileentity != null) {
                  Level world = this.level;
  
-@@ -553,6 +627,65 @@
- 
-     }
- 
+@@ -549,9 +626,68 @@
+         if (this.postLoad != null) {
+             this.postLoad.run(this);
+             this.postLoad = null;
++        }
++
++    }
++
 +    // CraftBukkit start
 +    public void loadCallback() {
 +        // Paper start
@@ -301,7 +333,7 @@
 +                }
 +                server.getPluginManager().callEvent(new org.bukkit.event.world.ChunkPopulateEvent(bukkitChunk));
 +            }
-+        }
+         }
 +    }
 +
 +    public void unloadCallback() {
@@ -316,17 +348,16 @@
 +        this.loadedTicketLevel = false;
 +        // Paper end
 +    }
-+
+ 
 +    @Override
 +    public boolean isUnsaved() {
 +        return super.isUnsaved() && !this.mustNotSave;
-+    }
+     }
 +    // CraftBukkit end
-+
+ 
      public boolean isEmpty() {
          return false;
-     }
-@@ -750,7 +883,7 @@
+@@ -750,7 +886,7 @@
  
      private <T extends BlockEntity> void updateBlockEntityTicker(T blockEntity) {
          BlockState iblockdata = blockEntity.getBlockState();
@@ -335,7 +366,7 @@
  
          if (blockentityticker == null) {
              this.removeBlockEntityTicker(blockEntity.getBlockPos());
-@@ -841,7 +974,7 @@
+@@ -841,7 +977,7 @@
          private boolean loggedInvalidBlockState;
  
          BoundTickingBlockEntity(final BlockEntity tileentity, final BlockEntityTicker blockentityticker) {
@@ -344,7 +375,7 @@
              this.ticker = blockentityticker;
          }
  
-@@ -867,11 +1000,13 @@
+@@ -867,11 +1003,13 @@
  
                          gameprofilerfiller.pop();
                      } catch (Throwable throwable) {

paper-server/patches/sources/net/minecraft/world/level/chunk/LevelChunkSection.java.patch

@@ -27,6 +27,15 @@
          this.recalcBlockCounts();
      }
  
+@@ -49,7 +49,7 @@
+     }
+ 
+     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() {
 @@ -196,6 +196,12 @@
          return (Holder) this.biomes.get(x, y, z);
      }