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_LIGHTS_PROJECTION_H 00037 #define PBRT_LIGHTS_PROJECTION_H 00038 00039 // lights/projection.h* 00040 #include "pbrt.h" 00041 #include "light.h" 00042 #include "shape.h" 00043 #include "mipmap.h" 00044 00045 // ProjectionLight Declarations 00046 class ProjectionLight : public Light { 00047 public: 00048 // ProjectionLight Public Methods 00049 ProjectionLight(const Transform &light2world, const Spectrum &intensity, 00050 const string &texname, float fov); 00051 ~ProjectionLight(); 00052 Spectrum Sample_L(const Point &p, float pEpsilon, const LightSample &ls, float time, 00053 Vector *wi, float *pdf, VisibilityTester *vis) const; 00054 bool IsDeltaLight() const { return true; } 00055 Spectrum Projection(const Vector &w) const; 00056 Spectrum Power(const Scene *) const; 00057 Spectrum Sample_L(const Scene *scene, const LightSample &ls, float u1, float u2, 00058 float time, Ray *ray, Normal *Ns, float *pdf) const; 00059 float Pdf(const Point &, const Vector &) const; 00060 private: 00061 // ProjectionLight Private Data 00062 MIPMap<RGBSpectrum> *projectionMap; 00063 Point lightPos; 00064 Spectrum Intensity; 00065 Transform lightProjection; 00066 float hither, yon; 00067 float screenX0, screenX1, screenY0, screenY1; 00068 float cosTotalWidth; 00069 }; 00070 00071 00072 ProjectionLight *CreateProjectionLight(const Transform &light2world, 00073 const ParamSet ¶mSet); 00074 00075 #endif // PBRT_LIGHTS_PROJECTION_H