PBRT
/home/felix/UBC/projects/AdaptiveLightfieldSampling/pbrt_v2/src/lights/goniometric.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_LIGHTS_GONIOMETRIC_H
00037 #define PBRT_LIGHTS_GONIOMETRIC_H
00038 
00039 // lights/goniometric.h*
00040 #include "pbrt.h"
00041 #include "light.h"
00042 #include "shape.h"
00043 #include "scene.h"
00044 #include "mipmap.h"
00045 
00046 // GonioPhotometricLight Declarations
00047 class GonioPhotometricLight : public Light {
00048 public:
00049     // GonioPhotometricLight Public Methods
00050     GonioPhotometricLight(const Transform &light2world, const Spectrum &, const
00051     string &texname);
00052     Spectrum Sample_L(const Point &p, float pEpsilon, const LightSample &ls,
00053         float time, Vector *wi, float *pdf, VisibilityTester *vis) const;
00054     ~GonioPhotometricLight() { delete mipmap; }
00055     bool IsDeltaLight() const { return true; }
00056     Spectrum Scale(const Vector &w) const {
00057         Vector wp = Normalize(WorldToLight(w));
00058         swap(wp.y, wp.z);
00059         float theta = SphericalTheta(wp);
00060         float phi   = SphericalPhi(wp);
00061         float s = phi * INV_TWOPI, t = theta * INV_PI;
00062         return (mipmap == NULL) ? 1.f :
00063                Spectrum(mipmap->Lookup(s, t, SPECTRUM_ILLUMINANT));
00064     }
00065     Spectrum Power(const Scene *) const;
00066     Spectrum Sample_L(const Scene *scene, const LightSample &ls, float u1, float u2,
00067         float time, Ray *ray, Normal *Ns, float *pdf) const;
00068     float Pdf(const Point &, const Vector &) const;
00069 private:
00070     // GonioPhotometricLight Private Data
00071     Point lightPos;
00072     Spectrum Intensity;
00073     MIPMap<RGBSpectrum> *mipmap;
00074 };
00075 
00076 
00077 GonioPhotometricLight *CreateGoniometricLight(const Transform &light2world,
00078         const ParamSet &paramSet);
00079 
00080 #endif // PBRT_LIGHTS_GONIOMETRIC_H