42 lines
1.1 KiB
Plaintext
42 lines
1.1 KiB
Plaintext
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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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