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121 lines
4.8 KiB
121 lines
4.8 KiB
/* -*-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_CUBEMAPGENERATOR_ |
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#define OSGUTIL_CUBEMAPGENERATOR_ |
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#include <osgUtil/Export> |
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#include <osg/Vec3> |
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#include <osg/Vec4> |
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#include <osg/CopyOp> |
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#include <osg/Referenced> |
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#include <osg/TextureCubeMap> |
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#include <osg/Image> |
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#include <osg/Notify> |
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#include <vector> |
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namespace osgUtil |
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{ |
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/** This is the base class for cube map generators. |
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It exposes the necessary interface to access the six generated images; |
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descendants should only override the compute_color() method. |
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*/ |
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class OSGUTIL_EXPORT CubeMapGenerator: public osg::Referenced { |
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public: |
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explicit CubeMapGenerator(int texture_size = 64); |
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CubeMapGenerator(const CubeMapGenerator ©, const osg::CopyOp ©op = osg::CopyOp::SHALLOW_COPY); |
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inline osg::Image *getImage(osg::TextureCubeMap::Face face); |
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inline const osg::Image *getImage(osg::TextureCubeMap::Face face) const; |
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/** Generate the six cube images. |
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If use_osg_system is true, then the OSG's coordinate system is used instead |
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of the default OpenGL one. |
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*/ |
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void generateMap(bool use_osg_system = true); |
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protected: |
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virtual ~CubeMapGenerator() {} |
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CubeMapGenerator &operator=(const CubeMapGenerator &) { return *this; } |
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inline void set_pixel(int index, int c, int r, const osg::Vec4 &color); |
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inline static osg::Vec4 vector_to_color(const osg::Vec3 &vec); |
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/** Override this method to define how colors are computed. |
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The parameter R is the reflection vector, pointing from the center of the cube. |
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The return value should be the RGBA color associated with that reflection ray. |
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*/ |
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virtual osg::Vec4 compute_color(const osg::Vec3 &R) const = 0; |
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private: |
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int texture_size_; |
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typedef std::vector<osg::ref_ptr<osg::Image> > Image_list; |
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Image_list images_; |
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}; |
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// INLINE METHODS |
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inline osg::Image *CubeMapGenerator::getImage(osg::TextureCubeMap::Face face) |
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{ |
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switch (face) { |
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case osg::TextureCubeMap::POSITIVE_X: return images_[0].get(); |
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case osg::TextureCubeMap::NEGATIVE_X: return images_[1].get(); |
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case osg::TextureCubeMap::POSITIVE_Y: return images_[2].get(); |
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case osg::TextureCubeMap::NEGATIVE_Y: return images_[3].get(); |
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case osg::TextureCubeMap::POSITIVE_Z: return images_[4].get(); |
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case osg::TextureCubeMap::NEGATIVE_Z: return images_[5].get(); |
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default: return 0; |
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} |
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} |
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inline const osg::Image *CubeMapGenerator::getImage(osg::TextureCubeMap::Face face) const |
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{ |
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switch (face) { |
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case osg::TextureCubeMap::POSITIVE_X: return images_[0].get(); |
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case osg::TextureCubeMap::NEGATIVE_X: return images_[1].get(); |
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case osg::TextureCubeMap::POSITIVE_Y: return images_[2].get(); |
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case osg::TextureCubeMap::NEGATIVE_Y: return images_[3].get(); |
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case osg::TextureCubeMap::POSITIVE_Z: return images_[4].get(); |
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case osg::TextureCubeMap::NEGATIVE_Z: return images_[5].get(); |
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default: return 0; |
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} |
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} |
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inline void CubeMapGenerator::set_pixel(int index, int c, int r, const osg::Vec4 &color) |
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{ |
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osg::Image *i = images_[index].get(); |
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if (i) { |
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*(i->data(c, r)+0) = static_cast<unsigned char>(osg::clampBetween(color.x(),0.0f,1.0f) * 255); |
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*(i->data(c, r)+1) = static_cast<unsigned char>(osg::clampBetween(color.y(),0.0f,1.0f) * 255); |
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*(i->data(c, r)+2) = static_cast<unsigned char>(osg::clampBetween(color.z(),0.0f,1.0f) * 255); |
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*(i->data(c, r)+3) = static_cast<unsigned char>(osg::clampBetween(color.w(),0.0f,1.0f) * 255); |
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} else { |
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osg::notify(osg::WARN) << "Warning: CubeMapGenerator::set_pixel(): invalid image index\n"; |
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} |
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} |
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inline osg::Vec4 CubeMapGenerator::vector_to_color(const osg::Vec3 &vec) |
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{ |
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return osg::Vec4( |
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vec.x() / vec.length() / 2 + 0.5f, |
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vec.y() / vec.length() / 2 + 0.5f, |
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vec.z() / vec.length() / 2 + 0.5f, |
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1); |
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} |
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} |
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#endif
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