PBRT
/home/felix/UBC/projects/AdaptiveLightfieldSampling/pbrt_v2/src/integrators/igi.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_INTEGRATORS_IGI_H
00037 #define PBRT_INTEGRATORS_IGI_H
00038 
00039 // integrators/igi.h*
00040 #include "pbrt.h"
00041 #include "integrator.h"
00042 
00043 // IGIIntegrator Local Structures
00044 struct VirtualLight {
00045     VirtualLight() { }
00046     VirtualLight(const Point &pp, const Normal &nn, const Spectrum &c,
00047                  float reps)
00048         : p(pp), n(nn), pathContrib(c), rayEpsilon(reps) { }
00049     Point p;
00050     Normal n;
00051     Spectrum pathContrib;
00052     float rayEpsilon;
00053 };
00054 
00055 
00056 
00057 // IGIIntegrator Declarations
00058 class IGIIntegrator : public SurfaceIntegrator {
00059 public:
00060     // IGIIntegrator Public Methods
00061     ~IGIIntegrator();
00062     Spectrum Li(const Scene *scene, const Renderer *renderer,
00063         const RayDifferential &ray, const Intersection &isect,
00064         const Sample *sample, RNG &rng, MemoryArena &arena) const;
00065     void RequestSamples(Sampler *sampler, Sample *sample, const Scene *scene);
00066     void Preprocess(const Scene *, const Camera *, const Renderer *);
00067     IGIIntegrator(uint32_t nl, uint32_t ns, float rrt, int maxd, float gl, int ng) {
00068         nLightPaths = RoundUpPow2(nl);
00069         nLightSets = RoundUpPow2(ns);
00070         rrThreshold = rrt;
00071         maxSpecularDepth = maxd;
00072         virtualLights.resize(nLightSets);
00073         gLimit = gl;
00074         nGatherSamples = ng;
00075         lightSampleOffsets = NULL;
00076         bsdfSampleOffsets = NULL;
00077     }
00078 private:
00079     // IGIIntegrator Private Data
00080 
00081     // Declare sample parameters for light source sampling
00082     LightSampleOffsets *lightSampleOffsets;
00083     BSDFSampleOffsets *bsdfSampleOffsets;
00084     uint32_t nLightPaths, nLightSets;
00085     float gLimit;
00086     int nGatherSamples;
00087     float rrThreshold;
00088     int maxSpecularDepth;
00089     int vlSetOffset;
00090     BSDFSampleOffsets gatherSampleOffset;
00091     vector<vector<VirtualLight> > virtualLights;
00092 };
00093 
00094 
00095 IGIIntegrator *CreateIGISurfaceIntegrator(const ParamSet &params);
00096 
00097 #endif // PBRT_INTEGRATORS_IGI_H