00001 /*************************************************************************** 00002 * Copyright (C) 1998-2009 by authors (see AUTHORS.txt ) * 00003 * * 00004 * This file is part of LuxRender. * 00005 * * 00006 * Lux Renderer is free software; you can redistribute it and/or modify * 00007 * it under the terms of the GNU General Public License as published by * 00008 * the Free Software Foundation; either version 3 of the License, or * 00009 * (at your option) any later version. * 00010 * * 00011 * Lux Renderer is distributed in the hope that it will be useful, * 00012 * but WITHOUT ANY WARRANTY; without even the implied warranty of * 00013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * 00014 * GNU General Public License for more details. * 00015 * * 00016 * You should have received a copy of the GNU General Public License * 00017 * along with this program. If not, see <http://www.gnu.org/licenses/>. * 00018 * * 00019 * This project is based on PBRT ; see http://www.pbrt.org * 00020 * Lux Renderer website : http://www.luxrender.net * 00021 ***************************************************************************/ 00022 00023 // mitchell.cpp* 00024 #include "mitchell.h" 00025 #include "dynload.h" 00026 00027 using namespace lux; 00028 00029 // Mitchell Filter Method Definitions 00030 float MitchellFilter::Evaluate(float x, float y) const { 00031 return Mitchell1D(x * invXWidth) * 00032 Mitchell1D(y * invYWidth); 00033 } 00034 Filter* MitchellFilter::CreateFilter(const ParamSet &ps) { 00035 // Find common filter parameters 00036 float xw = ps.FindOneFloat("xwidth", 2.); 00037 float yw = ps.FindOneFloat("ywidth", 2.); 00038 float B = ps.FindOneFloat("B", 1.f/3.f); 00039 float C = ps.FindOneFloat("C", 1.f/3.f); 00040 return new MitchellFilter(B, C, xw, yw); 00041 } 00042 00043 static DynamicLoader::RegisterFilter<MitchellFilter> r("mitchell");