64 lines
2.0 KiB
C++
64 lines
2.0 KiB
C++
/* -*-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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