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/*
* Modification History
*
* 2000-December-20 Jason Rohrer
* Created.
*/
#ifndef DIRECTION_LIGHTING_GL_INCLUDED
#define DIRECTION_LIGHTING_GL_INCLUDED
#include <stdio.h>
#include "LightingGL.h"
/**
* A LightingGL implementation with a single point light source
* at distance infinity.
*
* @author Jason Rohrer
*/
class DirectionLightingGL : public LightingGL {
public:
/**
* Constructs a DirectionLighting.
*
* @param inColor color of lighting for a surface
* that is facing directly into the light source.
* Is not copied, so cannot be accessed again by caller.
* @param inDirection incoming direction of light source.
* Is not copied, so cannot be accessed again by caller.
*/
DirectionLightingGL( Color *inColor, Vector3D *inDirection );
~DirectionLightingGL();
// implements LightingGL interface
void getLighting( Vector3D *inPoint, Vector3D *inNormal,
Color *outColor );
private:
Color *mColor;
// direction pointing *towards* light source
Vector3D *mDirection;
};
inline DirectionLightingGL::DirectionLightingGL( Color *inColor,
Vector3D *inDirection )
: mColor( inColor ), mDirection( inDirection ) {
// reverse the passed-in direction
mDirection->scale( -1 );
}
inline DirectionLightingGL::~DirectionLightingGL() {
delete mColor;
delete mDirection;
}
inline void DirectionLightingGL::getLighting( Vector3D *inPoint,
Vector3D *inNormal, Color *outColor ) {
double dot = inNormal->dot( mDirection );
if( dot > 0 ) {
outColor->r = mColor->r * dot;
outColor->g = mColor->g * dot;
outColor->b = mColor->b * dot;
}
else {
outColor->r = 0;
outColor->g = 0;
outColor->b = 0;
}
}
#endif
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