CatServer/patches/net/minecraft/world/biome/BiomeProvider.java.patch

--- ../src-base/minecraft/net/minecraft/world/biome/BiomeProvider.java
+++ ../src-work/minecraft/net/minecraft/world/biome/BiomeProvider.java
@@ -22,11 +22,12 @@
     private GenLayer biomeIndexLayer;
     private final BiomeCache biomeCache;
     private final List<Biome> biomesToSpawnIn;
+    public static List<Biome> allowedBiomes = Lists.newArrayList(Biomes.FOREST, Biomes.PLAINS, Biomes.TAIGA, Biomes.TAIGA_HILLS, Biomes.FOREST_HILLS, Biomes.JUNGLE, Biomes.JUNGLE_HILLS);
 
     protected BiomeProvider()
     {
         this.biomeCache = new BiomeCache(this);
-        this.biomesToSpawnIn = Lists.newArrayList(Biomes.FOREST, Biomes.PLAINS, Biomes.TAIGA, Biomes.TAIGA_HILLS, Biomes.FOREST_HILLS, Biomes.JUNGLE, Biomes.JUNGLE_HILLS);
+        this.biomesToSpawnIn = Lists.newArrayList(allowedBiomes);
     }
 
     private BiomeProvider(long seed, WorldType worldTypeIn, String options)
@@ -39,6 +40,7 @@
         }
 
         GenLayer[] agenlayer = GenLayer.initializeAllBiomeGenerators(seed, worldTypeIn, this.settings);
+        agenlayer = getModdedBiomeGenerators(worldTypeIn, seed, agenlayer);
         this.genBiomes = agenlayer[0];
         this.biomeIndexLayer = agenlayer[1];
     }
@@ -207,6 +209,13 @@
         this.biomeCache.cleanupCache();
     }
 
+    public GenLayer[] getModdedBiomeGenerators(WorldType worldType, long seed, GenLayer[] original)
+    {
+        net.minecraftforge.event.terraingen.WorldTypeEvent.InitBiomeGens event = new net.minecraftforge.event.terraingen.WorldTypeEvent.InitBiomeGens(worldType, seed, original);
+        net.minecraftforge.common.MinecraftForge.TERRAIN_GEN_BUS.post(event);
+        return event.getNewBiomeGens();
+    }
+
     public boolean isFixedBiome()
     {
         return this.settings != null && this.settings.fixedBiome >= 0;