123 lines
4.2 KiB
C++
123 lines
4.2 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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//osgFX - Copyright (C) 2003 Marco Jez
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#ifndef OSGFX_ANISOTROPICLIGHTING_
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#define OSGFX_ANISOTROPICLIGHTING_
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#include <osgFX/Export>
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#include <osgFX/Effect>
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#include <osg/ref_ptr>
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#include <osg/Texture2D>
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namespace osgFX
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{
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/**
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This single-pass effect implements a sort of anisotropic
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lighting that replaces the standard OpenGL lighting model.
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The final color of vertices is not computed directly, it is
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the result of a texture lookup on a user-supplied lighting
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image map. A vertex program is used to compute the s and t
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texture coordinates as follows: s = (N dot H) ; t = (N dot L)
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where N is the vertex normal, L is the light-to-vertex vector,
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H is the half-way vector. This is a good example of how you
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can use the State::getInitialViewMatrix() method to retrieve
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the view matrix and perform view-dependant effects without
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fakes of any kind.
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This effect requires the ARB_vertex_program extension.
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*/
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class OSGFX_EXPORT AnisotropicLighting: public Effect {
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public:
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AnisotropicLighting();
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AnisotropicLighting(const AnisotropicLighting& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY);
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META_Effect(osgFX, AnisotropicLighting,
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"Anisotropic Lighting",
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"This single-pass effect implements a sort of anisotropic "
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"lighting that replaces the standard OpenGL lighting model.\n"
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"The final color of vertices is not computed directly, it is "
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"the result of a texture lookup on a user-supplied lighting "
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"image map. A vertex program is used to compute the s and t "
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"texture coordinates as follows: s = (N dot H) ; t = (N dot L) "
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"where N is the vertex normal, L is the light-to-vertex vector, "
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"H is the half-way vector. This is a good example of how you "
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"can use the State::getInitialViewMatrix() method to retrieve "
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"the view matrix and perform view-dependant effects without "
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"fakes of any kind.\n"
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"This effect requires the ARB_vertex_program extension.",
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"Marco Jez");
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/** get the lighting map */
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inline osg::Image* getLightingMap();
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/** get the const lighting map */
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inline const osg::Image* getLightingMap() const;
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/** set the lighting map */
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inline void setLightingMap(osg::Image* image);
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/** get the OpenGL light number */
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inline int getLightNumber() const;
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/** set the OpenGL light number that will be used in lighting computations */
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inline void setLightNumber(int n);
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protected:
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virtual ~AnisotropicLighting() {}
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AnisotropicLighting& operator=(const AnisotropicLighting&) { return *this; }
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bool define_techniques();
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private:
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int _lightnum;
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osg::ref_ptr<osg::Texture2D> _texture;
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};
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// INLINE METHODS
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inline osg::Image* AnisotropicLighting::getLightingMap()
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{
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return _texture->getImage();
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}
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inline const osg::Image* AnisotropicLighting::getLightingMap() const
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{
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return _texture->getImage();
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}
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inline void AnisotropicLighting::setLightingMap(osg::Image* image)
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{
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_texture->setImage(image);
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}
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inline int AnisotropicLighting::getLightNumber() const
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{
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return _lightnum;
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}
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inline void AnisotropicLighting::setLightNumber(int n)
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{
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_lightnum = n;
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dirtyTechniques();
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}
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}
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#endif
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