// $Id: //sw/devtools/FXComposer2/Alpha4+/SDK/MEDIA/CgFX1.4/yuv.cgh#1 $ 

// Color-space conversion functions

#ifndef _H_RGB_YUV
#define _H_RGB_YUV

#include "quad.cgh"

QUAD_REAL3 rgb_to_yuv(QUAD_REAL3 RGB)
{
	QUAD_REAL y = dot(RGB,QUAD_REAL3(0.299,0.587,0.114));
	QUAD_REAL u = (RGB.z - y) * 0.565;
	QUAD_REAL v = (RGB.x - y) * 0.713;
    return QUAD_REAL3(y,u,v);
}

QUAD_REAL3 yuv_to_rgb(QUAD_REAL3 YUV)
{
   QUAD_REAL u = YUV.y;
   QUAD_REAL v = YUV.z;
   QUAD_REAL r = YUV.x + 1.403*v;
   QUAD_REAL g = YUV.x - 0.344*u - 1.403*v;
   QUAD_REAL b = YUV.x + 1.770*u;
   return QUAD_REAL3(r,g,b);
}

#endif /* _H_RGB_YUV */

/// eof