From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Paul Sauve <paul@technove.co>
Date: Thu, 4 Feb 2021 23:33:52 -0600
Subject: [PATCH] Reduce chunk loading & lookups

Airplane
Copyright (C) 2020 Technove LLC

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

diff --git a/src/main/java/net/minecraft/world/entity/monster/EntityEnderman.java b/src/main/java/net/minecraft/world/entity/monster/EntityEnderman.java
index e993b1849beb60515c51ee4f37617faab63ca223..4d7b5d47ab6bd3b1408811c3b9c157b1eb5c30ae 100644
--- a/src/main/java/net/minecraft/world/entity/monster/EntityEnderman.java
+++ b/src/main/java/net/minecraft/world/entity/monster/EntityEnderman.java
@@ -57,6 +57,7 @@ import net.minecraft.world.level.World;
 import net.minecraft.world.level.block.Block;
 import net.minecraft.world.level.block.Blocks;
 import net.minecraft.world.level.block.state.IBlockData;
+import net.minecraft.world.level.chunk.Chunk;
 import net.minecraft.world.level.pathfinder.PathType;
 import net.minecraft.world.phys.AxisAlignedBB;
 import net.minecraft.world.phys.MovingObjectPositionBlock;
@@ -314,11 +315,18 @@ public class EntityEnderman extends EntityMonster implements IEntityAngerable {
     private boolean p(double d0, double d1, double d2) {
         BlockPosition.MutableBlockPosition blockposition_mutableblockposition = new BlockPosition.MutableBlockPosition(d0, d1, d2);
 
-        while (blockposition_mutableblockposition.getY() > 0 && !this.world.getType(blockposition_mutableblockposition).getMaterial().isSolid()) {
+        // Airplane start - single chunk lookup
+        Chunk chunk = this.world.getChunkIfLoaded(blockposition_mutableblockposition);
+        if (chunk == null) {
+            return false;
+        }
+
+        while (blockposition_mutableblockposition.getY() > 0 && !chunk.getType(blockposition_mutableblockposition).getMaterial().isSolid()) { // use chunk lookup
             blockposition_mutableblockposition.c(EnumDirection.DOWN);
         }
 
-        IBlockData iblockdata = this.world.getType(blockposition_mutableblockposition);
+        IBlockData iblockdata = chunk.getType(blockposition_mutableblockposition); // use chunk lookup
+        // Airplane end
         boolean flag = iblockdata.getMaterial().isSolid();
         boolean flag1 = iblockdata.getFluid().a((Tag) TagsFluid.WATER);
 
diff --git a/src/main/java/net/minecraft/world/level/SpawnerCreature.java b/src/main/java/net/minecraft/world/level/SpawnerCreature.java
index d497006f05f79015cd791849888832bb53f4a414..d98526785ff2fa3b72e8ffffcb89a57a2203a5c8 100644
--- a/src/main/java/net/minecraft/world/level/SpawnerCreature.java
+++ b/src/main/java/net/minecraft/world/level/SpawnerCreature.java
@@ -415,7 +415,10 @@ public final class SpawnerCreature {
     }
 
     private static List<BiomeSettingsMobs.c> a(WorldServer worldserver, StructureManager structuremanager, ChunkGenerator chunkgenerator, EnumCreatureType enumcreaturetype, BlockPosition blockposition, @Nullable BiomeBase biomebase) {
-        return enumcreaturetype == EnumCreatureType.MONSTER && worldserver.getType(blockposition.down()).getBlock() == Blocks.NETHER_BRICKS && structuremanager.a(blockposition, false, StructureGenerator.FORTRESS).e() ? StructureGenerator.FORTRESS.c() : chunkgenerator.getMobsFor(biomebase != null ? biomebase : worldserver.getBiome(blockposition), structuremanager, enumcreaturetype, blockposition);
+        // Airplane start - single chunk lookup
+        Chunk chunk;
+        return enumcreaturetype == EnumCreatureType.MONSTER && (chunk = worldserver.getChunkIfLoaded(blockposition)) != null && chunk.getType(blockposition.down()).getBlock() == Blocks.NETHER_BRICKS && structuremanager.a(blockposition, false, StructureGenerator.FORTRESS).e() ? StructureGenerator.FORTRESS.c() : chunkgenerator.getMobsFor(biomebase != null ? biomebase : worldserver.getBiome(blockposition), structuremanager, enumcreaturetype, blockposition);
+        // Airplane end
     }
 
     private static BlockPosition getRandomPosition(World world, Chunk chunk) {
