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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.filter;
import java.nio.FloatBuffer;
import com.jme3.terrain.noise.Basis;
public class HydraulicErodeFilter extends AbstractFilter {
private Basis waterMap;
private Basis sedimentMap;
private float Kr;
private float Ks;
private float Ke;
private float Kc;
private float T;
public void setKc(float kc) {
this.Kc = kc;
}
public void setKe(float ke) {
this.Ke = ke;
}
public void setKr(float kr) {
this.Kr = kr;
}
public void setKs(float ks) {
this.Ks = ks;
}
public void setSedimentMap(Basis sedimentMap) {
this.sedimentMap = sedimentMap;
}
public void setT(float t) {
this.T = t;
}
public void setWaterMap(Basis waterMap) {
this.waterMap = waterMap;
}
@Override
public int getMargin(int size, int margin) {
return super.getMargin(size, margin) + 1;
}
@Override
public FloatBuffer filter(float sx, float sy, float base, FloatBuffer buffer, int workSize) {
float[] ga = buffer.array();
// float[] wa = this.waterMap.getBuffer(sx, sy, base, workSize).array();
// float[] sa = this.sedimentMap.getBuffer(sx, sy, base,
// workSize).array();
float[] wt = new float[workSize * workSize];
float[] st = new float[workSize * workSize];
int[] idxrel = { -workSize - 1, -workSize + 1, workSize - 1, workSize + 1 };
// step 1. water arrives and step 2. captures material
for (int y = 0; y < workSize; y++) {
for (int x = 0; x < workSize; x++) {
int idx = y * workSize + x;
float wtemp = this.Kr; // * wa[idx];
float stemp = this.Ks; // * sa[idx];
if (wtemp > 0) {
wt[idx] += wtemp;
if (stemp > 0) {
ga[idx] -= stemp * wt[idx];
st[idx] += stemp * wt[idx];
}
}
// step 3. water is transported to it's neighbours
float a = ga[idx] + wt[idx];
// float[] aj = new float[idxrel.length];
float amax = 0;
int amaxidx = -1;
float ac = 0;
float dtotal = 0;
for (int j = 0; j < idxrel.length; j++) {
if (idx + idxrel[j] > 0 && idx + idxrel[j] < workSize) {
float at = ga[idx + idxrel[j]] + wt[idx + idxrel[j]];
if (a - at > a - amax) {
dtotal += at;
amax = at;
amaxidx = j;
ac++;
}
}
}
float aa = (dtotal + a) / (ac + 1);
// for (int j = 0; j < idxrel.length; j++) {
// if (idx + idxrel[j] > 0 && idx + idxrel[j] < workSize && a -
// aj[j] > 0) {
if (amaxidx > -1) {
float dwj = Math.min(wt[idx], a - aa) * (a - amax) / dtotal;
float dsj = st[idx] * dwj / wt[idx];
wt[idx] -= dwj;
st[idx] -= dsj;
wt[idx + idxrel[amaxidx]] += dwj;
st[idx + idxrel[amaxidx]] += dsj;
}
// }
// step 4. water evaporates and deposits material
wt[idx] = wt[idx] * (1 - this.Ke);
if (wt[idx] < this.T) {
wt[idx] = 0;
}
float smax = this.Kc * wt[idx];
if (st[idx] > smax) {
ga[idx] += st[idx] - smax;
st[idx] -= st[idx] - smax;
}
}
}
return buffer;
}
}
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