root/OpenSceneGraph/trunk/include/osgUtil/HalfWayMapGenerator @ 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_HALFWAYMAPGENERATOR_
14#define OSGUTIL_HALFWAYMAPGENERATOR_
15
16#include <osgUtil/Export>
17
18#include <osgUtil/CubeMapGenerator>
19
20namespace osgUtil
21{
22
23    /** This cube map generator produces an Half-way vector map, useful for
24      * hardware-based specular lighting effects.
25      * It computes: C = normalize(R - L), where C is the resulting color,
26      * R is the reflection vector and L is the light direction.
27      */
28    class OSGUTIL_EXPORT HalfWayMapGenerator: public CubeMapGenerator {
29    public:
30        HalfWayMapGenerator(const osg::Vec3 &light_direction, int texture_size = 64);
31        HalfWayMapGenerator(const HalfWayMapGenerator &copy, const osg::CopyOp &copyop);
32
33    protected:
34        virtual ~HalfWayMapGenerator() {}
35        HalfWayMapGenerator &operator=(const HalfWayMapGenerator &) { return *this; }
36
37        inline virtual osg::Vec4 compute_color(const osg::Vec3 &R) const;
38
39    private:
40        osg::Vec3 ldir_;
41    };
42
43    // INLINE METHODS
44
45    inline osg::Vec4 HalfWayMapGenerator::compute_color(const osg::Vec3 &R) const
46    {
47        const osg::Vec3 V = (R / R.length()) - ldir_;
48        return vector_to_color(V / V.length());
49    }
50
51}
52
53#endif
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