    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}