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 #if defined(_MSC_VER) 00025 #pragma once 00026 #endif 00027 00028 #ifndef PBRT_CORE_FILTER_H 00029 #define PBRT_CORE_FILTER_H 00030 00031 // core/filter.h* 00032 #include "pbrt.h" 00033 00034 // Filter Declarations 00035 class Filter { 00036 public: 00037 // Filter Interface 00038 virtual ~Filter(); 00039 Filter(float xw, float yw) 00040 : xWidth(xw), yWidth(yw), invXWidth(1.f/xw), invYWidth(1.f/yw) { 00041 } 00042 virtual float Evaluate(float x, float y) const = 0; 00043 00044 // Filter Public Data 00045 const float xWidth, yWidth; 00046 const float invXWidth, invYWidth; 00047 }; 00048 00049 00050 00051 #endif // PBRT_CORE_FILTER_H