root/OpenSceneGraph/trunk/include/osgUtil/HighlightMapGenerator @ 13041

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1/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
2 *
3 * This library is open source and may be redistributed and/or modified under
4 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
5 * (at your option) any later version.  The full license is in LICENSE file
6 * included with this distribution, and on the openscenegraph.org website.
7 *
8 * This library is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11 * OpenSceneGraph Public License for more details.
12*/
13#ifndef OSGUTIL_HIGHLIGHTMAPGENERATOR_
14#define OSGUTIL_HIGHLIGHTMAPGENERATOR_
15
16#include <osgUtil/Export>
17
18#include <osgUtil/CubeMapGenerator>
19
20namespace osgUtil
21{
22
23    /** This cube map generator produces a specular highlight map.
24      * The vector-color association is: C = (R dot (-L)) ^ n, where C is the
25      * resulting color, R is the reflection vector, L is the light direction
26      * and n is the specular exponent.
27      */
28    class OSGUTIL_EXPORT HighlightMapGenerator: public CubeMapGenerator {
29    public:
30        HighlightMapGenerator(
31            const osg::Vec3 &light_direction,
32            const osg::Vec4 &light_color,
33            float specular_exponent,
34            int texture_size = 64);
35
36        HighlightMapGenerator(const HighlightMapGenerator &copy, const osg::CopyOp &copyop = osg::CopyOp::SHALLOW_COPY);
37
38    protected:
39        virtual ~HighlightMapGenerator() {}
40        HighlightMapGenerator &operator=(const HighlightMapGenerator &) { return *this; }
41
42        inline virtual osg::Vec4 compute_color(const osg::Vec3 &R) const;
43
44    private:
45        osg::Vec3 ldir_;
46        osg::Vec4 lcol_;
47        float sexp_;
48    };
49
50    // INLINE METHODS
51
52    inline osg::Vec4 HighlightMapGenerator::compute_color(const osg::Vec3 &R) const
53    {
54        float v = -ldir_ * (R / R.length());
55        if (v < 0) v = 0;
56        osg::Vec4 color(lcol_ * powf(v, sexp_));
57        color.w() = 1;
58        return color;
59    }
60
61}
62
63#endif
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