001    package net.minecraft.world.gen.layer;
002    
003    import net.minecraft.world.biome.BiomeGenBase;
004    
005    public class GenLayerRiver extends GenLayer
006    {
007        public GenLayerRiver(long par1, GenLayer par3GenLayer)
008        {
009            super(par1);
010            super.parent = par3GenLayer;
011        }
012    
013        /**
014         * Returns a list of integer values generated by this layer. These may be interpreted as temperatures, rainfall
015         * amounts, or biomeList[] indices based on the particular GenLayer subclass.
016         */
017        public int[] getInts(int par1, int par2, int par3, int par4)
018        {
019            int var5 = par1 - 1;
020            int var6 = par2 - 1;
021            int var7 = par3 + 2;
022            int var8 = par4 + 2;
023            int[] var9 = this.parent.getInts(var5, var6, var7, var8);
024            int[] var10 = IntCache.getIntCache(par3 * par4);
025    
026            for (int var11 = 0; var11 < par4; ++var11)
027            {
028                for (int var12 = 0; var12 < par3; ++var12)
029                {
030                    int var13 = var9[var12 + 0 + (var11 + 1) * var7];
031                    int var14 = var9[var12 + 2 + (var11 + 1) * var7];
032                    int var15 = var9[var12 + 1 + (var11 + 0) * var7];
033                    int var16 = var9[var12 + 1 + (var11 + 2) * var7];
034                    int var17 = var9[var12 + 1 + (var11 + 1) * var7];
035    
036                    if (var17 != 0 && var13 != 0 && var14 != 0 && var15 != 0 && var16 != 0 && var17 == var13 && var17 == var15 && var17 == var14 && var17 == var16)
037                    {
038                        var10[var12 + var11 * par3] = -1;
039                    }
040                    else
041                    {
042                        var10[var12 + var11 * par3] = BiomeGenBase.river.biomeID;
043                    }
044                }
045            }
046    
047            return var10;
048        }
049    }