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

From d1b37ea8c6311a440dd07946df88762e3d7d5579 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 99e5bd084..a2c6f56a0 100644
--- a/src/main/java/net/minecraft/server/level/ChunkProviderServer.java
+++ b/src/main/java/net/minecraft/server/level/ChunkProviderServer.java
@@ -431,7 +431,7 @@ public class ChunkProviderServer extends IChunkProvider {
 
                     if (this.level.a(chunkcoordintpair) && !this.chunkMap.isOutsideOfRange(chunkcoordintpair)) {
                         chunk.setInhabitedTime(chunk.getInhabitedTime() + j);
-                        if (flag1 && (this.spawnEnemies || this.spawnFriendlies) && this.level.getWorldBorder().isInBounds(chunkcoordintpair)) {
+                        if (flag1 && (this.spawnEnemies || this.spawnFriendlies) && this.level.getWorldBorder().isInBounds(chunk.getPos()) && !this.chunkMap.isOutsideOfRange(chunkcoordintpair, true)) { // Spigot
                             SpawnerCreature.a(this.level, chunk, spawnercreature_d, this.spawnFriendlies, this.spawnEnemies, flag2);
                         }
 
diff --git a/src/main/java/net/minecraft/server/level/PlayerChunkMap.java b/src/main/java/net/minecraft/server/level/PlayerChunkMap.java
index 87aa223a3..b8f605a4b 100644
--- a/src/main/java/net/minecraft/server/level/PlayerChunkMap.java
+++ b/src/main/java/net/minecraft/server/level/PlayerChunkMap.java
@@ -915,10 +915,21 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.e {
     }
 
     boolean isOutsideOfRange(ChunkCoordIntPair chunkcoordintpair) {
+        // Spigot start
+        return isOutsideOfRange(chunkcoordintpair, false);
+    }
+
+    boolean isOutsideOfRange(ChunkCoordIntPair chunkcoordintpair, boolean reducedRange) {
+        int chunkRange = level.spigotConfig.mobSpawnRange;
+        chunkRange = (chunkRange > level.spigotConfig.viewDistance) ? (byte) level.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.distanceManager.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