PBRT
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00001 00002 /* 00003 pbrt source code Copyright(c) 1998-2012 Matt Pharr and Greg Humphreys. 00004 00005 This file is part of pbrt. 00006 00007 Redistribution and use in source and binary forms, with or without 00008 modification, are permitted provided that the following conditions are 00009 met: 00010 00011 - Redistributions of source code must retain the above copyright 00012 notice, this list of conditions and the following disclaimer. 00013 00014 - Redistributions in binary form must reproduce the above copyright 00015 notice, this list of conditions and the following disclaimer in the 00016 documentation and/or other materials provided with the distribution. 00017 00018 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 00019 IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 00020 TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 00021 PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 00022 HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 00023 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 00024 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 00025 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 00026 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 00027 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 00028 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00029 00030 */ 00031 00032 #if defined(_MSC_VER) 00033 #pragma once 00034 #endif 00035 00036 #ifndef PBRT_FILTERS_GAUSSIAN_H 00037 #define PBRT_FILTERS_GAUSSIAN_H 00038 00039 // filters/gaussian.h* 00040 #include "filter.h" 00041 00042 // Gaussian Filter Declarations 00043 class GaussianFilter : public Filter { 00044 public: 00045 // GaussianFilter Public Methods 00046 GaussianFilter(float xw, float yw, float a) 00047 : Filter(xw, yw), alpha(a), expX(expf(-alpha * xWidth * xWidth)), 00048 expY(expf(-alpha * yWidth * yWidth)) { } 00049 float Evaluate(float x, float y) const; 00050 private: 00051 // GaussianFilter Private Data 00052 const float alpha; 00053 const float expX, expY; 00054 00055 // GaussianFilter Utility Functions 00056 float Gaussian(float d, float expv) const { 00057 return max(0.f, float(expf(-alpha * d * d) - expv)); 00058 } 00059 }; 00060 00061 00062 GaussianFilter *CreateGaussianFilter(const ParamSet &ps); 00063 00064 #endif // PBRT_FILTERS_GAUSSIAN_H