From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Paul Sauve <paul@technove.co>
Date: Tue, 22 Jun 2021 15:04:37 -0500
Subject: [PATCH] Use thread unsafe random for mob spawning


diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
index ad02d30bcad577dbe38b6c16657899636f891007..14ee66b677ad5de2058ae2083bed4a0fdcee20a9 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -835,7 +835,7 @@ public class ServerLevel extends Level implements WorldGenLevel {
     }
     // Paper start - optimise random block ticking
     private final BlockPos.MutableBlockPos chunkTickMutablePosition = new BlockPos.MutableBlockPos();
-    private final com.tuinity.tuinity.util.math.ThreadUnsafeRandom randomTickRandom = new com.tuinity.tuinity.util.math.ThreadUnsafeRandom();
+    private final com.tuinity.tuinity.util.math.ThreadUnsafeRandom randomTickRandom = new com.tuinity.tuinity.util.math.ThreadUnsafeRandom(); public java.util.Random getThreadUnsafeRandom() { return this.randomTickRandom; } // Airplane - getter
     // Paper end
 
     private int currentIceAndSnowTick = 0; protected void resetIceAndSnowTick() { this.currentIceAndSnowTick = this.randomTickRandom.nextInt(16); } // Airplane
diff --git a/src/main/java/net/minecraft/world/level/NaturalSpawner.java b/src/main/java/net/minecraft/world/level/NaturalSpawner.java
index c6821bfb28b582733cd977864c28ca5cf0c69872..ea77694307e5972b6c9ecf5f23515885974ed493 100644
--- a/src/main/java/net/minecraft/world/level/NaturalSpawner.java
+++ b/src/main/java/net/minecraft/world/level/NaturalSpawner.java
@@ -407,12 +407,12 @@ public final class NaturalSpawner {
         return spawnGroup == MobCategory.MONSTER && world.getBlockState(pos.below()).is(Blocks.NETHER_BRICKS) && structureAccessor.getStructureAt(pos, false, StructureFeature.NETHER_BRIDGE).isValid() ? StructureFeature.NETHER_BRIDGE.getSpecialEnemies() : chunkGenerator.getMobsAt(biome != null ? biome : world.getBiome(pos), structureAccessor, spawnGroup, pos);
     }
 
-    private static BlockPos getRandomPosWithin(Level world, LevelChunk chunk) {
+    private static BlockPos getRandomPosWithin(ServerLevel world, LevelChunk chunk) { // Airplane - accept serverlevel
         ChunkPos chunkcoordintpair = chunk.getPos();
-        int i = chunkcoordintpair.getMinBlockX() + world.random.nextInt(16);
-        int j = chunkcoordintpair.getMinBlockZ() + world.random.nextInt(16);
+        int i = chunkcoordintpair.getMinBlockX() + world.getThreadUnsafeRandom().nextInt(16); // Airplane - use thread unsafe random
+        int j = chunkcoordintpair.getMinBlockZ() + world.getThreadUnsafeRandom().nextInt(16); // Airplane
         int k = chunk.getHeight(Heightmap.Types.WORLD_SURFACE, i, j) + 1;
-        int l = Mth.randomBetweenInclusive(world.random, world.getMinBuildHeight(), k);
+        int l = Mth.randomBetweenInclusive(world.getThreadUnsafeRandom(), world.getMinBuildHeight(), k); // Airplane
 
         return new BlockPos(i, l, j);
     }