00001 00002 /* 00003 pbrt source code Copyright(c) 1998-2010 Matt Pharr and Greg Humphreys. 00004 00005 This file is part of pbrt. 00006 00007 pbrt is free software; you can redistribute it and/or modify 00008 it under the terms of the GNU General Public License as published by 00009 the Free Software Foundation; either version 2 of the License, or 00010 (at your option) any later version. Note that the text contents of 00011 the book "Physically Based Rendering" are *not* licensed under the 00012 GNU GPL. 00013 00014 pbrt is distributed in the hope that it will be useful, 00015 but WITHOUT ANY WARRANTY; without even the implied warranty of 00016 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00017 GNU General Public License for more details. 00018 00019 You should have received a copy of the GNU General Public License 00020 along with this program. If not, see <http://www.gnu.org/licenses/>. 00021 00022 */ 00023 00024 00025 // filters/triangle.cpp* 00026 #include "stdafx.h" 00027 #include "filters/triangle.h" 00028 #include "paramset.h" 00029 00030 // Triangle Filter Method Definitions 00031 float TriangleFilter::Evaluate(float x, float y) const { 00032 return max(0.f, xWidth - fabsf(x)) * 00033 max(0.f, yWidth - fabsf(y)); 00034 } 00035 00036 00037 TriangleFilter *CreateTriangleFilter(const ParamSet &ps) { 00038 // Find common filter parameters 00039 float xw = ps.FindOneFloat("xwidth", 2.f); 00040 float yw = ps.FindOneFloat("ywidth", 2.f); 00041 return new TriangleFilter(xw, yw); 00042 } 00043 00044