tcr/java/src/game/worldgen/GeneratorCavern.java

package game.worldgen;

import game.rng.OctaveGen;
import game.rng.Random;
import game.util.ExtMath;
import game.world.State;
import game.world.WorldServer;

public class GeneratorCavern implements ChunkGenerator
{
    private final OctaveGen noiseGen2;
    private final OctaveGen noiseGen3;
    private final OctaveGen noiseGen1;
//    private final OctaveGen noiseGen4;
//    private final OctaveGen noiseGen5;
    
    private final double[] noiseField = new double[425];
    private final double[] noiseData1 = new double[425];
    private final double[] noiseData2 = new double[425];
    private final double[] noiseData3 = new double[425];
//    private final double[] noiseData4 = new double[25];
//    private final double[] noiseData5 = new double[25];

    private final State filler;
    private final State liquid;
    
//    public GeneratorCavern(Dimension dim, Random rand) {
//    	this(rand);
//    }

    public GeneratorCavern(Random rand, State filler, State liquid)
    {
        this.noiseGen2 = new OctaveGen(rand, 16);
        this.noiseGen3 = new OctaveGen(rand, 16);
        this.noiseGen1 = new OctaveGen(rand, 8);
//        this.noiseGen4 = new OctaveGen(rand, 10);
//        this.noiseGen5 = new OctaveGen(rand, 16);
        this.filler = filler;
        this.liquid = liquid;
    }
    
	public int getMaximumHeight() {
		return 128;
	}

    public void generateChunk(WorldServer world, int x, int z, ChunkPrimer primer)
    {
        int range = 4;
        int lh = world.getSeaLevel() / 2 + 1;
        int xr = range + 1;
        int yr = 17;
        int zr = range + 1;
        this.genNoisemap(x * range, 0, z * range);

        for (int j1 = 0; j1 < range; ++j1)
        {
            for (int k1 = 0; k1 < range; ++k1)
            {
                for (int l1 = 0; l1 < 16; ++l1)
                {
                    double d0 = 0.125D;
                    double d1 = this.noiseField[((j1 + 0) * zr + k1 + 0) * yr + l1 + 0];
                    double d2 = this.noiseField[((j1 + 0) * zr + k1 + 1) * yr + l1 + 0];
                    double d3 = this.noiseField[((j1 + 1) * zr + k1 + 0) * yr + l1 + 0];
                    double d4 = this.noiseField[((j1 + 1) * zr + k1 + 1) * yr + l1 + 0];
                    double d5 = (this.noiseField[((j1 + 0) * zr + k1 + 0) * yr + l1 + 1] - d1) * d0;
                    double d6 = (this.noiseField[((j1 + 0) * zr + k1 + 1) * yr + l1 + 1] - d2) * d0;
                    double d7 = (this.noiseField[((j1 + 1) * zr + k1 + 0) * yr + l1 + 1] - d3) * d0;
                    double d8 = (this.noiseField[((j1 + 1) * zr + k1 + 1) * yr + l1 + 1] - d4) * d0;

                    for (int i2 = 0; i2 < 8; ++i2)
                    {
                        double d9 = 0.25D;
                        double d10 = d1;
                        double d11 = d2;
                        double d12 = (d3 - d1) * d9;
                        double d13 = (d4 - d2) * d9;

                        for (int j2 = 0; j2 < 4; ++j2)
                        {
                            double d14 = 0.25D;
                            double d15 = d10;
                            double d16 = (d11 - d10) * d14;

                            for (int k2 = 0; k2 < 4; ++k2)
                            {
                                State iblockstate = null;

                                if (l1 * 8 + i2 < lh)
                                {
                                    iblockstate = this.liquid;
                                }

                                if (d15 > 0.0D)
                                {
                                    iblockstate = this.filler;
                                }

                                int l2 = j2 + j1 * 4;
                                int i3 = i2 + l1 * 8;
                                int j3 = k2 + k1 * 4;
                                primer.set(l2, i3, j3, iblockstate);
                                d15 += d16;
                            }

                            d10 += d12;
                            d11 += d13;
                        }

                        d1 += d5;
                        d2 += d6;
                        d3 += d7;
                        d4 += d8;
                    }
                }
            }
        }
    }
    
    private void genNoisemap(int x, int y, int z)
    {
    	int xs = 5;
    	int ys = 17;
    	int zs = 5;
        double d0 = 684.412D;
        double d1 = 2053.236D;
//        this.noiseGen4.generate(this.noiseData4, x, y, z, xs, 1, zs, 1.0D, 0.0D, 1.0D);
//        this.noiseGen5.generate(this.noiseData5, x, y, z, xs, 1, zs, 100.0D, 0.0D, 100.0D);
        this.noiseGen1.generate(this.noiseData1, x, y, z, xs, ys, zs, d0 / 80.0D, d1 / 60.0D, d0 / 80.0D);
        this.noiseGen2.generate(this.noiseData2, x, y, z, xs, ys, zs, d0, d1, d0);
        this.noiseGen3.generate(this.noiseData3, x, y, z, xs, ys, zs, d0, d1, d0);
        int i = 0;
        double[] adouble = new double[ys];

        for (int j = 0; j < ys; ++j)
        {
            adouble[j] = Math.cos((double)j * Math.PI * 6.0D / (double)ys) * 2.0D;
            double d2 = (double)j;

            if (j > ys / 2)
            {
                d2 = (double)(ys - 1 - j);
            }

            if (d2 < 4.0D)
            {
                d2 = 4.0D - d2;
                adouble[j] -= d2 * d2 * d2 * 10.0D;
            }
        }

        for (int l = 0; l < xs; ++l)
        {
            for (int i1 = 0; i1 < zs; ++i1)
            {
                double d3 = 0.0D;

                for (int k = 0; k < ys; ++k)
                {
                    double d4 = 0.0D;
                    double d5 = adouble[k];
                    double d6 = this.noiseData2[i] / 512.0D;
                    double d7 = this.noiseData3[i] / 512.0D;
                    double d8 = (this.noiseData1[i] / 10.0D + 1.0D) / 2.0D;

                    if (d8 < 0.0D)
                    {
                        d4 = d6;
                    }
                    else if (d8 > 1.0D)
                    {
                        d4 = d7;
                    }
                    else
                    {
                        d4 = d6 + (d7 - d6) * d8;
                    }

                    d4 = d4 - d5;

                    if (k > ys - 4)
                    {
                        double d9 = (double)((float)(k - (ys - 4)) / 3.0F);
                        d4 = d4 * (1.0D - d9) + -10.0D * d9;
                    }

                    if ((double)k < d3)
                    {
                        double d10 = (d3 - (double)k) / 4.0D;
                        d10 = ExtMath.clampd(d10, 0.0D, 1.0D);
                        d4 = d4 * (1.0D - d10) + -10.0D * d10;
                    }

                    this.noiseField[i] = d4;
                    ++i;
                }
            }
        }
    }
}