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54 lines
1.8 KiB
54 lines
1.8 KiB
14 years ago
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/* -*-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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