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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.modulator;
import java.util.HashMap;
import java.util.Map;
import com.jme3.terrain.noise.ShaderUtils;
public class CatRom2 implements Modulator {
private int sampleRate = 100;
private final float[] table;
private static Map<Integer, CatRom2> instances = new HashMap<Integer, CatRom2>();
public CatRom2(final int sampleRate) {
this.sampleRate = sampleRate;
this.table = new float[4 * sampleRate + 1];
for (int i = 0; i < 4 * sampleRate + 1; i++) {
float x = i / (float) sampleRate;
x = (float) Math.sqrt(x);
if (x < 1) {
this.table[i] = 0.5f * (2 + x * x * (-5 + x * 3));
} else {
this.table[i] = 0.5f * (4 + x * (-8 + x * (5 - x)));
}
}
}
public static CatRom2 getInstance(final int sampleRate) {
if (!CatRom2.instances.containsKey(sampleRate)) {
CatRom2.instances.put(sampleRate, new CatRom2(sampleRate));
}
return CatRom2.instances.get(sampleRate);
}
@Override
public float value(final float... in) {
if (in[0] >= 4) {
return 0;
}
in[0] = in[0] * this.sampleRate + 0.5f;
int i = ShaderUtils.floor(in[0]);
if (i >= 4 * this.sampleRate + 1) {
return 0;
}
return this.table[i];
}
}
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