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/*
 * Copyright (c) 2011, Novyon Events
 * 
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * - Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 * 
 * - Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 * @author Anthyon
 */
package com.jme3.terrain.noise.fractal;

import com.jme3.terrain.noise.Basis;
import com.jme3.terrain.noise.ShaderUtils;
import com.jme3.terrain.noise.basis.ImprovedNoise;
import com.jme3.terrain.noise.basis.Noise;

/**
 * FractalSum is the simplest form of fractal functions summing up a few octaves
 * of the noise value with an ever decreasing roughness (0 to 1) amplitude
 * 
 * lacunarity = 2.0f is the classical octave distance
 * 
 * Note: though noise basis functions are generally designed to return value
 * between -1..1, there sum can easily be made to extend out of this range. To
 * handle this is up to the user.
 * 
 * @author Anthyon
 * 
 */
public class FractalSum extends Noise implements Fractal {

    private Basis basis;
    private float lacunarity;
    private float amplitude;
    private float roughness;
    private float frequency;
    private float octaves;
    private int maxFreq;

    public FractalSum() {
        this.basis = new ImprovedNoise();
        this.lacunarity = 2.124367f;
        this.amplitude = 1.0f;
        this.roughness = 0.6f;
        this.frequency = 1f;
        this.setOctaves(1);
    }

    @Override
    public float value(final float x, final float y, final float z) {
        float total = 0;

        for (float f = this.frequency, a = this.amplitude; f < this.maxFreq; f *= this.lacunarity, a *= this.roughness) {
            total += this.basis.value(this.scale * x * f, this.scale * y * f, this.scale * z * f) * a;
        }

        return ShaderUtils.clamp(total, -1, 1);
    }

    @Override
    public Fractal addBasis(final Basis basis) {
        this.basis = basis;
        return this;
    }

    public float getOctaves() {
        return this.octaves;
    }

    @Override
    public Fractal setOctaves(final float octaves) {
        this.octaves = octaves;
        this.maxFreq = 1 << (int) octaves;
        return this;
    }

    public float getFrequency() {
        return this.frequency;
    }

    @Override
    public Fractal setFrequency(final float frequency) {
        this.frequency = frequency;
        return this;
    }

    public float getRoughness() {
        return this.roughness;
    }

    @Override
    public Fractal setRoughness(final float roughness) {
        this.roughness = roughness;
        return this;
    }

    public float getAmplitude() {
        return this.amplitude;
    }

    @Override
    public Fractal setAmplitude(final float amplitude) {
        this.amplitude = amplitude;
        return this;
    }

    public float getLacunarity() {
        return this.lacunarity;
    }

    @Override
    public Fractal setLacunarity(final float lacunarity) {
        this.lacunarity = lacunarity;
        return this;
    }

    @Override
    public void init() {

    }

}