spigot/CraftBukkit-Patches/0010-Fix-Mob-Spawning-Relative-to-View-Distance.patch

From 08402796889970f21cc411b489f64da9ee2ebde0 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/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
index 417704a77..dcf2d38df 100644
--- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
+++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
@@ -319,9 +319,9 @@ public class ChunkProviderServer extends IChunkProvider {
                     this.world.getMethodProfiler().exit();
                     ChunkCoordIntPair chunkcoordintpair = playerchunk.h();
 
-                    if (!this.playerChunkMap.isOutsideOfRange(chunkcoordintpair)) {
+                    if (!this.playerChunkMap.isOutsideOfRange(chunkcoordintpair, false)) { // Spigot
                         chunk.b(chunk.q() + 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
                             this.world.getMethodProfiler().enter("spawner");
                             this.world.timings.mobSpawn.startTiming(); // Spigot
                             EnumCreatureType[] aenumcreaturetype1 = aenumcreaturetype;
diff --git a/src/main/java/net/minecraft/server/PlayerChunkMap.java b/src/main/java/net/minecraft/server/PlayerChunkMap.java
index 19de8c19f..9b9f70182 100644
--- a/src/main/java/net/minecraft/server/PlayerChunkMap.java
+++ b/src/main/java/net/minecraft/server/PlayerChunkMap.java
@@ -739,9 +739,17 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
         return nbttagcompound == null ? null : this.getChunkData(this.world.getWorldProvider().getDimensionManager(), this.m, nbttagcompound, chunkcoordintpair, world); // CraftBukkit
     }
 
-    boolean isOutsideOfRange(ChunkCoordIntPair chunkcoordintpair) {
+    // Spigot Start
+    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
+
         return this.playerMap.a(chunkcoordintpair.pair()).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 47e959af0..fc592d814 100644
--- a/src/main/java/org/spigotmc/SpigotWorldConfig.java
+++ b/src/main/java/org/spigotmc/SpigotWorldConfig.java
@@ -148,4 +148,11 @@ public class SpigotWorldConfig
         viewDistance = Math.max( viewDistance, 3 );
         log( "View Distance: " + viewDistance );
     }
+
+    public byte mobSpawnRange;
+    private void mobSpawnRange()
+    {
+        mobSpawnRange = (byte) getInt( "mob-spawn-range", 6 );
+        log( "Mob Spawn Range: " + mobSpawnRange );
+    }
 }
-- 
2.20.1