PBRT
|
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_SAMPLERS_BESTCANDIDATE_H 00037 #define PBRT_SAMPLERS_BESTCANDIDATE_H 00038 00039 // samplers/bestcandidate.h* 00040 #include "sampler.h" 00041 #include "paramset.h" 00042 #include "film.h" 00043 00044 // BestCandidate Sampling Constants 00045 #define SQRT_SAMPLE_TABLE_SIZE 64 00046 #define SAMPLE_TABLE_SIZE (SQRT_SAMPLE_TABLE_SIZE * \ 00047 SQRT_SAMPLE_TABLE_SIZE) 00048 00049 // BestCandidateSampler Declarations 00050 class BestCandidateSampler : public Sampler { 00051 public: 00052 // BestCandidateSampler Public Methods 00053 BestCandidateSampler(int xstart, int xend, int ystart, int yend, 00054 int nPixelSamples, float sopen, float sclose) 00055 : Sampler(xstart, xend, ystart, yend, nPixelSamples, sopen, sclose) { 00056 tableWidth = (float)SQRT_SAMPLE_TABLE_SIZE / 00057 (float)sqrtf(nPixelSamples); 00058 xTileStart = Floor2Int(xstart / tableWidth); 00059 xTileEnd = Floor2Int(xend / tableWidth); 00060 yTileStart = Floor2Int(ystart / tableWidth); 00061 yTileEnd = Floor2Int(yend / tableWidth); 00062 xTile = xTileStart; 00063 yTile = yTileStart; 00064 tableOffset = 0; 00065 // Update sample shifts 00066 RNG tileRng(xTile + (yTile<<8)); 00067 for (int i = 0; i < 3; ++i) 00068 sampleOffsets[i] = tileRng.RandomFloat(); 00069 } 00070 Sampler *GetSubSampler(int num, int count); 00071 int RoundSize(int size) const { 00072 return RoundUpPow2(size); 00073 } 00074 int MaximumSampleCount() { return 1; } 00075 int GetMoreSamples(Sample *sample, RNG &rng); 00076 private: 00077 // BestCandidateSampler Private Data 00078 float tableWidth; 00079 int tableOffset; 00080 int xTileStart, xTileEnd, yTileStart, yTileEnd; 00081 int xTile, yTile; 00082 static const float sampleTable[SAMPLE_TABLE_SIZE][5]; 00083 float sampleOffsets[3]; 00084 }; 00085 00086 00087 BestCandidateSampler *CreateBestCandidateSampler(const ParamSet ¶ms, const Film *film, 00088 const Camera *camera); 00089 00090 #endif // PBRT_SAMPLERS_BESTCANDIDATE_H