GenLayerDayZRiver.java

package com.github.dayzminecraft.dayzminecraft.common.world.genlayer;

import com.github.dayzminecraft.dayzminecraft.common.world.IWorldType;
import net.minecraft.world.biome.BiomeGenBase;
import net.minecraft.world.gen.layer.GenLayer;
import net.minecraft.world.gen.layer.IntCache;

public class GenLayerDayZRiver extends GenLayer {
  private IWorldType worldType;

  public GenLayerDayZRiver(long l, GenLayer genlayer, IWorldType worldtype) {
    super(l);
    super.parent = genlayer;
    worldType = worldtype;
  }

  @Override
  public int[] getInts(int par1, int par2, int par3, int par4) {
    int i = par1 - 1;
    int j = par2 - 1;
    int k = par3 + 2;
    int l = par4 + 2;
    int ai[] = parent.getInts(i, j, k, l);
    int ai1[] = IntCache.getIntCache(par3 * par4);

    for (int i1 = 0; i1 < par4; i1++) {
      for (int j1 = 0; j1 < par3; j1++) {
        int k1 = ai[j1 + 0 + (i1 + 1) * k];
        int l1 = ai[j1 + 2 + (i1 + 1) * k];
        int i2 = ai[j1 + 1 + (i1) * k];
        int j2 = ai[j1 + 1 + (i1 + 2) * k];
        int k2 = ai[j1 + 1 + (i1 + 1) * k];

        BiomeGenBase river = worldType.setRiverBiomes(null, this);
        if (river != null && (k2 == 0 || k1 == 0 || l1 == 0 || i2 == 0 || j2 == 0)) {
          ai1[j1 + i1 * par3] = river.biomeID;
          continue;
        }

        if (river != null && (k2 != k1 || k2 != i2 || k2 != l1 || k2 != j2)) {
          ai1[j1 + i1 * par3] = river.biomeID;
        } else {
          ai1[j1 + i1 * par3] = -1;
        }
      }
    }

    return ai1;
  }
}