/***************************************************************************
 *   Copyright (C) 1998-2009 by authors (see AUTHORS.txt )                 *
 *                                                                         *
 *   This file is part of LuxRender.                                       *
 *                                                                         *
 *   Lux Renderer is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 3 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   Lux Renderer 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 General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
 *                                                                         *
 *   This project is based on PBRT ; see http://www.pbrt.org               *
 *   Lux Renderer website : http://www.luxrender.net                       *
 ***************************************************************************/

// triangle.cpp*
#include "triangle.h"
#include "dynload.h"

using namespace lux;

// Triangle Filter Method Definitions
float TriangleFilter::Evaluate(float x, float y) const {
	return max(0.f, xWidth - fabsf(x)) *
		max(0.f, yWidth - fabsf(y));
}
Filter* TriangleFilter::CreateFilter(const ParamSet &ps) {
	// Find common filter parameters
	float xw = ps.FindOneFloat("xwidth", 2.);
	float yw = ps.FindOneFloat("ywidth", 2.);
	return new TriangleFilter(xw, yw);
}

static DynamicLoader::RegisterFilter<TriangleFilter> r("triangle");
