Add clamping to 0..1 bounds for each of the r,g,b,a components in
the CubeMapGenerator::set_pixel() method.
This commit is contained in:
Robert Osfield
parent
c69a8a5b80
commit
bfd1286b25
@ -138,6 +138,9 @@ inline T clampAbove(T v,T minimum) { return v<minimum?minimum:v; }
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template<typename T>
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inline T clampBelow(T v,T maximum) { return v>maximum?maximum:v; }
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template<typename T>
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inline T clampBetween(T v,T minimum, T maximum) { return clampBelow(clampAbove(v,minimum),maximum); }
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template<typename T>
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inline T sign(T v) { return v<(T)0?(T)-1:(T)1; }
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@ -28,93 +28,93 @@
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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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/** 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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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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/** 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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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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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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/** 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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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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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 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 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 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>(color.x() * 255);
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*(i->data(c, r)+1) = static_cast<unsigned char>(color.y() * 255);
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*(i->data(c, r)+2) = static_cast<unsigned char>(color.z() * 255);
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*(i->data(c, r)+3) = static_cast<unsigned char>(color.w() * 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 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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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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@ -20,43 +20,43 @@
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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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/** 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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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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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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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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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 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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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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@ -43,13 +43,13 @@ CubeMapGenerator::CubeMapGenerator(const CubeMapGenerator ©, const osg::Copy
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void CubeMapGenerator::generateMap(bool use_osg_system)
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{
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osg::Matrix M;
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if (use_osg_system) {
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M = osg::Matrix::rotate(osg::PI_2, osg::Vec3(1, 0, 0));
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} else {
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M = osg::Matrix::identity();
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}
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osg::Matrix M;
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if (use_osg_system) {
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M = osg::Matrix::rotate(osg::PI_2, osg::Vec3(1, 0, 0));
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} else {
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M = osg::Matrix::identity();
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}
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const float dst = 2.0f/(texture_size_-1);
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@ -57,7 +57,7 @@ void CubeMapGenerator::generateMap(bool use_osg_system)
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for (int i=0; i<texture_size_; ++i) {
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float s = -1;
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for (int j=0; j<texture_size_; ++j) {
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set_pixel(0, j, i, compute_color(osg::Vec3(1, -t, -s) * M));
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set_pixel(0, j, i, compute_color(osg::Vec3(1, -t, -s) * M));
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set_pixel(1, j, i, compute_color(osg::Vec3(-1, -t, s) * M));
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set_pixel(2, j, i, compute_color(osg::Vec3(s, 1, t) * M));
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set_pixel(3, j, i, compute_color(osg::Vec3(s, -1, -t) * M));
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@ -15,21 +15,21 @@
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using namespace osgUtil;
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HighlightMapGenerator::HighlightMapGenerator(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)
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: CubeMapGenerator(texture_size),
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ldir_(light_direction),
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lcol_(light_color),
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sexp_(specular_exponent)
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const osg::Vec4 &light_color,
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float specular_exponent,
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int texture_size)
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: CubeMapGenerator(texture_size),
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ldir_(light_direction),
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lcol_(light_color),
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sexp_(specular_exponent)
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{
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ldir_.normalize();
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ldir_.normalize();
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}
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HighlightMapGenerator::HighlightMapGenerator(const HighlightMapGenerator ©, const osg::CopyOp ©op)
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: CubeMapGenerator(copy, copyop),
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ldir_(copy.ldir_),
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lcol_(copy.lcol_),
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sexp_(copy.sexp_)
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: CubeMapGenerator(copy, copyop),
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ldir_(copy.ldir_),
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lcol_(copy.lcol_),
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sexp_(copy.sexp_)
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{
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}
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