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/mitchell.cpp* 00026 #include "stdafx.h" 00027 #include "filters/mitchell.h" 00028 #include "paramset.h" 00029 00030 // Mitchell Filter Method Definitions 00031 float MitchellFilter::Evaluate(float x, float y) const { 00032 return Mitchell1D(x * invXWidth) * Mitchell1D(y * invYWidth); 00033 } 00034 00035 00036 MitchellFilter *CreateMitchellFilter(const ParamSet &ps) { 00037 // Find common filter parameters 00038 float xw = ps.FindOneFloat("xwidth", 2.f); 00039 float yw = ps.FindOneFloat("ywidth", 2.f); 00040 float B = ps.FindOneFloat("B", 1.f/3.f); 00041 float C = ps.FindOneFloat("C", 1.f/3.f); 00042 return new MitchellFilter(B, C, xw, yw); 00043 } 00044 00045