1 files changed, 52 insertions, 0 deletions
diff --git a/patches/server/0643-Optimise-BlockSoil-nearby-water-lookup.patch b/patches/server/0643-Optimise-BlockSoil-nearby-water-lookup.patch
new file mode 100644
index 0000000000..b192406016
--- /dev/null
+++ b/patches/server/0643-Optimise-BlockSoil-nearby-water-lookup.patch
@@ -0,0 +1,52 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Spottedleaf <[email protected]>
+Date: Thu, 10 Jun 2021 14:36:00 -0700
+Subject: [PATCH] Optimise BlockSoil nearby water lookup
+
+Apparently the abstract block iteration was taking about
+75% of the method call.
+
+diff --git a/src/main/java/net/minecraft/world/level/block/FarmBlock.java b/src/main/java/net/minecraft/world/level/block/FarmBlock.java
+index 66106b821d7a384a2eb0f27993beb9f4257e6815..6e4c852c93f2418ea69e485ed3a10cbe3a6e3bd2 100644
+--- a/src/main/java/net/minecraft/world/level/block/FarmBlock.java
++++ b/src/main/java/net/minecraft/world/level/block/FarmBlock.java
+@@ -151,19 +151,28 @@ public class FarmBlock extends Block {
+     }
+ 
+     private static boolean isNearWater(LevelReader world, BlockPos pos) {
+-        Iterator iterator = BlockPos.betweenClosed(pos.offset(-4, 0, -4), pos.offset(4, 1, 4)).iterator();
+-
+-        BlockPos blockposition1;
+-
+-        do {
+-            if (!iterator.hasNext()) {
+-                return false;
++        // Paper start - Perf: remove abstract block iteration
++        int xOff = pos.getX();
++        int yOff = pos.getY();
++        int zOff = pos.getZ();
++
++        for (int dz = -4; dz <= 4; ++dz) {
++            int z = dz + zOff;
++            for (int dx = -4; dx <= 4; ++dx) {
++                int x = xOff + dx;
++                for (int dy = 0; dy <= 1; ++dy) {
++                    int y = dy + yOff;
++                    net.minecraft.world.level.chunk.LevelChunk chunk = (net.minecraft.world.level.chunk.LevelChunk)world.getChunk(x >> 4, z >> 4);
++                    net.minecraft.world.level.material.FluidState fluid = chunk.getBlockStateFinal(x, y, z).getFluidState();
++                    if (fluid.is(FluidTags.WATER)) {
++                        return true;
++                    }
++                }
+             }
++        }
+ 
+-            blockposition1 = (BlockPos) iterator.next();
+-        } while (!world.getFluidState(blockposition1).is(FluidTags.WATER));
+-
+-        return true;
++        return false;
++        // Paper end - Perf: remove abstract block iteration
+     }
+ 
+     @Override