PBRT
/home/felix/UBC/projects/AdaptiveLightfieldSampling/pbrt_v2/src/samplers/bestcandidate.h
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 &params, const Film *film,
00088     const Camera *camera);
00089 
00090 #endif // PBRT_SAMPLERS_BESTCANDIDATE_H