001package net.minecraft.world.gen.layer;
002
003import net.minecraft.world.biome.BiomeGenBase;
004
005public 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 i1 = par1 - 1;
020        int j1 = par2 - 1;
021        int k1 = par3 + 2;
022        int l1 = par4 + 2;
023        int[] aint = this.parent.getInts(i1, j1, k1, l1);
024        int[] aint1 = IntCache.getIntCache(par3 * par4);
025
026        for (int i2 = 0; i2 < par4; ++i2)
027        {
028            for (int j2 = 0; j2 < par3; ++j2)
029            {
030                int k2 = aint[j2 + 0 + (i2 + 1) * k1];
031                int l2 = aint[j2 + 2 + (i2 + 1) * k1];
032                int i3 = aint[j2 + 1 + (i2 + 0) * k1];
033                int j3 = aint[j2 + 1 + (i2 + 2) * k1];
034                int k3 = aint[j2 + 1 + (i2 + 1) * k1];
035
036                if (k3 != 0 && k2 != 0 && l2 != 0 && i3 != 0 && j3 != 0 && k3 == k2 && k3 == i3 && k3 == l2 && k3 == j3)
037                {
038                    aint1[j2 + i2 * par3] = -1;
039                }
040                else
041                {
042                    aint1[j2 + i2 * par3] = BiomeGenBase.river.biomeID;
043                }
044            }
045        }
046
047        return aint1;
048    }
049}