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Paper/patches/unapplied/server/0269-Prevent-mob-spawning-from-loading-generating-chunks.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Wed, 12 Sep 2018 21:12:57 -0400
Subject: [PATCH] Prevent mob spawning from loading/generating chunks
also prevents if out of world border bounds
diff --git a/src/main/java/net/minecraft/world/level/NaturalSpawner.java b/src/main/java/net/minecraft/world/level/NaturalSpawner.java
index ca0fcf46e67deb07a3fdb071b771a7603e0fc3d0..c8b9877135aebf1f500ab9b00d94dde0e846d247 100644
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--- a/src/main/java/net/minecraft/world/level/NaturalSpawner.java
+++ b/src/main/java/net/minecraft/world/level/NaturalSpawner.java
@@ -193,9 +193,9 @@ public final class NaturalSpawner {
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StructureFeatureManager structuremanager = world.structureFeatureManager();
ChunkGenerator chunkgenerator = world.getChunkSource().getGenerator();
int i = pos.getY();
- BlockState iblockdata = chunk.getBlockState(pos);
+ BlockState iblockdata = world.getTypeIfLoadedAndInBounds(pos); // Paper - don't load chunks for mob spawn
- if (!iblockdata.isRedstoneConductor(chunk, pos)) {
+ if (iblockdata != null && !iblockdata.isRedstoneConductor(chunk, pos)) { // Paper - don't load chunks for mob spawn
BlockPos.MutableBlockPos blockposition_mutableblockposition = new BlockPos.MutableBlockPos();
int j = 0;
int k = 0;
@@ -224,7 +224,7 @@ public final class NaturalSpawner {
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if (entityhuman != null) {
double d2 = entityhuman.distanceToSqr(d0, (double) i, d1);
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- if (NaturalSpawner.isRightDistanceToPlayerAndSpawnPoint(world, chunk, blockposition_mutableblockposition, d2)) {
+ if (world.isLoadedAndInBounds(blockposition_mutableblockposition) && NaturalSpawner.isRightDistanceToPlayerAndSpawnPoint(world, chunk, blockposition_mutableblockposition, d2)) { // Paper - don't load chunks for mob spawn
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if (biomesettingsmobs_c == null) {
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Optional<MobSpawnSettings.SpawnerData> optional = NaturalSpawner.getRandomSpawnMobAt(world, structuremanager, chunkgenerator, group, world.random, (BlockPos) blockposition_mutableblockposition);