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53 lines
1.8 KiB
53 lines
1.8 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_HALFWAYMAPGENERATOR_ |
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#define OSGUTIL_HALFWAYMAPGENERATOR_ |
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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 an Half-way vector map, useful for |
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* hardware-based specular lighting effects. |
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* It computes: C = normalize(R - L), where C is the resulting color, |
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* R is the reflection vector and L is the light direction. |
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*/ |
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class OSGUTIL_EXPORT HalfWayMapGenerator: public CubeMapGenerator { |
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public: |
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HalfWayMapGenerator(const osg::Vec3 &light_direction, int texture_size = 64); |
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HalfWayMapGenerator(const HalfWayMapGenerator ©, const osg::CopyOp ©op); |
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protected: |
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virtual ~HalfWayMapGenerator() {} |
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HalfWayMapGenerator &operator=(const HalfWayMapGenerator &) { 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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}; |
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// INLINE METHODS |
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inline osg::Vec4 HalfWayMapGenerator::compute_color(const osg::Vec3 &R) const |
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{ |
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const osg::Vec3 V = (R / R.length()) - ldir_; |
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return vector_to_color(V / V.length()); |
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} |
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} |
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#endif
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