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63 lines
2.0 KiB
63 lines
2.0 KiB
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield |
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* |
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* This library is open source and may be redistributed and/or modified under |
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or |
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* (at your option) any later version. The full license is in LICENSE file |
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* included with this distribution, and on the openscenegraph.org website. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* OpenSceneGraph Public License for more details. |
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*/ |
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#ifndef OSGUTIL_HIGHLIGHTMAPGENERATOR_ |
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#define OSGUTIL_HIGHLIGHTMAPGENERATOR_ |
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#include <osgUtil/Export> |
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#include <osgUtil/CubeMapGenerator> |
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namespace osgUtil |
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{ |
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/** This cube map generator produces a specular highlight map. |
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* The vector-color association is: C = (R dot (-L)) ^ n, where C is the |
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* resulting color, R is the reflection vector, L is the light direction |
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* and n is the specular exponent. |
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*/ |
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class OSGUTIL_EXPORT HighlightMapGenerator: public CubeMapGenerator { |
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public: |
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HighlightMapGenerator( |
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const osg::Vec3 &light_direction, |
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const osg::Vec4 &light_color, |
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float specular_exponent, |
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int texture_size = 64); |
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HighlightMapGenerator(const HighlightMapGenerator ©, const osg::CopyOp ©op = osg::CopyOp::SHALLOW_COPY); |
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protected: |
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virtual ~HighlightMapGenerator() {} |
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HighlightMapGenerator &operator=(const HighlightMapGenerator &) { return *this; } |
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inline virtual osg::Vec4 compute_color(const osg::Vec3 &R) const; |
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private: |
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osg::Vec3 ldir_; |
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osg::Vec4 lcol_; |
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float sexp_; |
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}; |
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// INLINE METHODS |
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inline osg::Vec4 HighlightMapGenerator::compute_color(const osg::Vec3 &R) const |
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{ |
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float v = -ldir_ * (R / R.length()); |
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if (v < 0) v = 0; |
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osg::Vec4 color(lcol_ * powf(v, sexp_)); |
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color.w() = 1; |
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return color; |
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} |
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} |
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#endif
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