52 lines
1.3 KiB
Plaintext
52 lines
1.3 KiB
Plaintext
#ifndef OSGUTIL_HIGHLIGHTMAPGENERATOR_
|
|
#define OSGUTIL_HIGHLIGHTMAPGENERATOR_
|
|
|
|
#include <osgUtil/Export>
|
|
|
|
#include <osgUtil/CubeMapGenerator>
|
|
|
|
namespace osgUtil
|
|
{
|
|
|
|
/** This cube map generator produces a specular highlight map.
|
|
The vector-color association is: C = (R dot (-L)) ^ n, where C is the
|
|
resulting color, R is the reflection vector, L is the light direction
|
|
and n is the specular exponent.
|
|
*/
|
|
class OSGUTIL_EXPORT HighlightMapGenerator: public CubeMapGenerator {
|
|
public:
|
|
HighlightMapGenerator(
|
|
const osg::Vec3 &light_direction,
|
|
const osg::Vec4 &light_color,
|
|
float specular_exponent,
|
|
int texture_size = 64);
|
|
|
|
HighlightMapGenerator(const HighlightMapGenerator ©, const osg::CopyOp ©op = osg::CopyOp::SHALLOW_COPY);
|
|
|
|
protected:
|
|
virtual ~HighlightMapGenerator() {}
|
|
HighlightMapGenerator &operator=(const HighlightMapGenerator &) { return *this; }
|
|
|
|
inline virtual osg::Vec4 compute_color(const osg::Vec3 &R) const;
|
|
|
|
private:
|
|
osg::Vec3 ldir_;
|
|
osg::Vec4 lcol_;
|
|
float sexp_;
|
|
};
|
|
|
|
// INLINE METHODS
|
|
|
|
inline osg::Vec4 HighlightMapGenerator::compute_color(const osg::Vec3 &R) const
|
|
{
|
|
float v = -ldir_ * (R / R.length());
|
|
if (v < 0) v = 0;
|
|
osg::Vec4 color(lcol_ * powf(v, sexp_));
|
|
color.w() = 1;
|
|
return color;
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|