spigot/CraftBukkit-Patches/0009-Fix-Mob-Spawning-Relative-to-View-Distance.patch

From cf4cb376a53f6a796b6458c00f83af3e384c4139 Mon Sep 17 00:00:00 2001
From: md_5 <md_5@live.com.au>
Date: Fri, 21 Jun 2013 17:29:54 +1000
Subject: [PATCH] Fix Mob Spawning Relative to View Distance

Changes the mob spawning algorithm to properly account for view distance and the range around players.

Needs better documentation.

diff --git a/src/main/java/net/minecraft/server/level/ChunkProviderServer.java b/src/main/java/net/minecraft/server/level/ChunkProviderServer.java
index d5de3e3e8..e95f51675 100644
--- a/src/main/java/net/minecraft/server/level/ChunkProviderServer.java
+++ b/src/main/java/net/minecraft/server/level/ChunkProviderServer.java
@@ -423,7 +423,7 @@ public class ChunkProviderServer extends IChunkProvider {
 
                         if (!this.playerChunkMap.isOutsideOfRange(chunkcoordintpair)) {
                             chunk.setInhabitedTime(chunk.getInhabitedTime() + j);
-                            if (flag1 && (this.allowMonsters || this.allowAnimals) && this.world.getWorldBorder().isInBounds(chunk.getPos())) {
+                            if (flag1 && (this.allowMonsters || this.allowAnimals) && this.world.getWorldBorder().isInBounds(chunk.getPos()) && !this.playerChunkMap.isOutsideOfRange(chunkcoordintpair, true)) { // Spigot
                                 SpawnerCreature.a(this.world, chunk, spawnercreature_d, this.allowAnimals, this.allowMonsters, flag2);
                             }
 
diff --git a/src/main/java/net/minecraft/server/level/PlayerChunkMap.java b/src/main/java/net/minecraft/server/level/PlayerChunkMap.java
index 6fd7cc2e8..7ca5068fb 100644
--- a/src/main/java/net/minecraft/server/level/PlayerChunkMap.java
+++ b/src/main/java/net/minecraft/server/level/PlayerChunkMap.java
@@ -906,10 +906,21 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
     }
 
     boolean isOutsideOfRange(ChunkCoordIntPair chunkcoordintpair) {
+        // Spigot start
+        return isOutsideOfRange(chunkcoordintpair, false);
+    }
+
+    boolean isOutsideOfRange(ChunkCoordIntPair chunkcoordintpair, boolean reducedRange) {
+        int chunkRange = world.spigotConfig.mobSpawnRange;
+        chunkRange = (chunkRange > world.spigotConfig.viewDistance) ? (byte) world.spigotConfig.viewDistance : chunkRange;
+        chunkRange = (chunkRange > 8) ? 8 : chunkRange;
+
+        double blockRange = (reducedRange) ? Math.pow(chunkRange << 4, 2) : 16384.0D;
+        // Spigot end
         long i = chunkcoordintpair.pair();
 
         return !this.chunkDistanceManager.d(i) ? true : this.playerMap.a(i).noneMatch((entityplayer) -> {
-            return !entityplayer.isSpectator() && a(chunkcoordintpair, (Entity) entityplayer) < 16384.0D;
+            return !entityplayer.isSpectator() && a(chunkcoordintpair, (Entity) entityplayer) < blockRange; // Spigot
         });
     }
 
diff --git a/src/main/java/org/spigotmc/SpigotWorldConfig.java b/src/main/java/org/spigotmc/SpigotWorldConfig.java
index 8db1bc203..e780cc473 100644
--- a/src/main/java/org/spigotmc/SpigotWorldConfig.java
+++ b/src/main/java/org/spigotmc/SpigotWorldConfig.java
@@ -161,4 +161,11 @@ public class SpigotWorldConfig
         viewDistance = Math.max( Math.min( viewDistance, 32 ), 3 );
         log( "View Distance: " + viewDistance );
     }
+
+    public byte mobSpawnRange;
+    private void mobSpawnRange()
+    {
+        mobSpawnRange = (byte) getInt( "mob-spawn-range", 6 );
+        log( "Mob Spawn Range: " + mobSpawnRange );
+    }
 }
-- 
2.25.1