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Add clamping to 0..1 bounds for each of the r,g,b,a components in

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the CubeMapGenerator::set_pixel() method.
This commit is contained in:
Robert Osfield
2004-06-04 11:35:13 +00:00
parent c69a8a5b80
commit bfd1286b25
5 changed files with 129 additions and 126 deletions
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62
include/osgUtil/HighlightMapGenerator
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@@ -20,43 +20,43 @@
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);
/** 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 &copy, const osg::CopyOp &copyop = osg::CopyOp::SHALLOW_COPY);
HighlightMapGenerator(const HighlightMapGenerator &copy, const osg::CopyOp &copyop = osg::CopyOp::SHALLOW_COPY);
protected:
virtual ~HighlightMapGenerator() {}
HighlightMapGenerator &operator=(const HighlightMapGenerator &) { return *this; }
protected:
virtual ~HighlightMapGenerator() {}
HighlightMapGenerator &operator=(const HighlightMapGenerator &) { return *this; }
inline virtual osg::Vec4 compute_color(const osg::Vec3 &R) const;
inline virtual osg::Vec4 compute_color(const osg::Vec3 &R) const;
private:
osg::Vec3 ldir_;
osg::Vec4 lcol_;
float sexp_;
};
private:
osg::Vec3 ldir_;
osg::Vec4 lcol_;
float sexp_;
};
// INLINE METHODS
// 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;
}
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;
}
}