00001 00002 /* 00003 pbrt source code Copyright(c) 1998-2010 Matt Pharr and Greg Humphreys. 00004 00005 This file is part of pbrt. 00006 00007 pbrt is free software; you can redistribute it and/or modify 00008 it under the terms of the GNU General Public License as published by 00009 the Free Software Foundation; either version 2 of the License, or 00010 (at your option) any later version. Note that the text contents of 00011 the book "Physically Based Rendering" are *not* licensed under the 00012 GNU GPL. 00013 00014 pbrt is distributed in the hope that it will be useful, 00015 but WITHOUT ANY WARRANTY; without even the implied warranty of 00016 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00017 GNU General Public License for more details. 00018 00019 You should have received a copy of the GNU General Public License 00020 along with this program. If not, see <http://www.gnu.org/licenses/>. 00021 00022 */ 00023 00024 #if defined(_MSC_VER) 00025 #pragma once 00026 #endif 00027 00028 #ifndef PBRT_TEXTURES_MIX_H 00029 #define PBRT_TEXTURES_MIX_H 00030 00031 // textures/mix.h* 00032 #include "pbrt.h" 00033 #include "texture.h" 00034 #include "paramset.h" 00035 00036 // MixTexture Declarations 00037 template <typename T> class MixTexture : public Texture<T> { 00038 public: 00039 // MixTexture Public Methods 00040 MixTexture(Reference<Texture<T> > t1, Reference<Texture<T> > t2, 00041 Reference<Texture<float> > amt) 00042 : tex1(t1), tex2(t2), amount(amt) { } 00043 T Evaluate(const DifferentialGeometry &dg) const { 00044 T t1 = tex1->Evaluate(dg), t2 = tex2->Evaluate(dg); 00045 float amt = amount->Evaluate(dg); 00046 return (1.f - amt) * t1 + amt * t2; 00047 } 00048 private: 00049 Reference<Texture<T> > tex1, tex2; 00050 Reference<Texture<float> > amount; 00051 }; 00052 00053 00054 MixTexture<float> *CreateMixFloatTexture(const Transform &tex2world, 00055 const TextureParams &tp); 00056 MixTexture<Spectrum> *CreateMixSpectrumTexture(const Transform &tex2world, 00057 const TextureParams &tp); 00058 00059 #endif // PBRT_TEXTURES_MIX_H