001    package net.minecraft.world.gen.layer;
002    
003    import net.minecraft.world.WorldType;
004    import net.minecraft.world.biome.BiomeGenBase;
005    
006    public class GenLayerBiome extends GenLayer
007    {
008        /** this sets all the biomes that are allowed to appear in the overworld */
009        private BiomeGenBase[] allowedBiomes;
010    
011        public GenLayerBiome(long par1, GenLayer par3GenLayer, WorldType par4WorldType)
012        {
013            super(par1);
014            this.allowedBiomes = par4WorldType.getBiomesForWorldType();
015            this.parent = par3GenLayer;
016        }
017    
018        /**
019         * Returns a list of integer values generated by this layer. These may be interpreted as temperatures, rainfall
020         * amounts, or biomeList[] indices based on the particular GenLayer subclass.
021         */
022        public int[] getInts(int par1, int par2, int par3, int par4)
023        {
024            int[] var5 = this.parent.getInts(par1, par2, par3, par4);
025            int[] var6 = IntCache.getIntCache(par3 * par4);
026    
027            for (int var7 = 0; var7 < par4; ++var7)
028            {
029                for (int var8 = 0; var8 < par3; ++var8)
030                {
031                    this.initChunkSeed((long)(var8 + par1), (long)(var7 + par2));
032                    int var9 = var5[var8 + var7 * par3];
033    
034                    if (var9 == 0)
035                    {
036                        var6[var8 + var7 * par3] = 0;
037                    }
038                    else if (var9 == BiomeGenBase.mushroomIsland.biomeID)
039                    {
040                        var6[var8 + var7 * par3] = var9;
041                    }
042                    else if (var9 == 1)
043                    {
044                        var6[var8 + var7 * par3] = this.allowedBiomes[this.nextInt(this.allowedBiomes.length)].biomeID;
045                    }
046                    else
047                    {
048                        int var10 = this.allowedBiomes[this.nextInt(this.allowedBiomes.length)].biomeID;
049    
050                        if (var10 == BiomeGenBase.taiga.biomeID)
051                        {
052                            var6[var8 + var7 * par3] = var10;
053                        }
054                        else
055                        {
056                            var6[var8 + var7 * par3] = BiomeGenBase.icePlains.biomeID;
057                        }
058                    }
059                }
060            }
061    
062            return var6;
063        }
064    }