/*
* Copyright 2011, Zettabyte Storage LLC
*
* This file is part of Vash.
*
* Vash is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Vash is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Vash. If not, see <http://www.gnu.org/licenses/>.
*/
package vash.operation;
import vash.ImageParameters;
import vash.Plane;
import vash.Seed;
public class Exponentiate extends BinaryOperationNode {
public Exponentiate(OperationNode a, OperationNode b) {super(a,b);}
public Exponentiate(Seed s) {super(s);}
@Override
public OperationNode clone() {
return new Exponentiate(_children[0].clone(), _children[1].clone());
}
@Override
public Plane compute(ImageParameters ip) {
float twoOverPi = (float)(2.0 / Math.PI);
Plane A = _children[0].compute(ip);
Plane B = _children[1].compute(ip);
Plane out = ip.getPlane();
for(int j = 0; j < ip.getH(); j++ ) {
for(int i = 0; i < ip.getW(); i++) {
float v0 = A.data[i][j];
float val;
if(v0 == 0.0f)
val = 0.0f;
else if(v0 < 0.0f)
val = (float)(-Math.pow(-v0, B.data[i][j]));
else
val = (float)Math.pow(v0, B.data[i][j]);
val *= twoOverPi;
out.data[i][j] = OperationNode.clampf(val, -1.0f, 1.0f);
}
}
ip.putPlane(A);
ip.putPlane(B);
return out;
}
}