// mcpro24fps mSLog Extreme to Rec.709
// ver. 2020-04-13

__CONSTANT__ float A = 0.616596;
__CONSTANT__ float B = 0.03;
__CONSTANT__ float C = 0.31;
__CONSTANT__ float D = 0.01026;
__CONSTANT__ float E = 1.08;
__CONSTANT__ float LEVEL = 18.0;

__DEVICE__ float3 transform(int p_Width, int p_Height, int p_X, int p_Y, float p_R, float p_G, float p_B)
{
	float3 rgb;
 
	rgb.x = p_R;
    rgb.y = p_G;
    rgb.z = p_B;

	rgb.x = (_powf(10.0, ((E*rgb.x - A - B) / C)) - D)/LEVEL;
	rgb.y = (_powf(10.0, ((E*rgb.y - A - B) / C)) - D)/LEVEL;
	rgb.z = (_powf(10.0, ((E*rgb.z - A - B) / C)) - D)/LEVEL;
	
	rgb.x = rgb.x < 0 ? 0 : rgb.x;
	rgb.y = rgb.y < 0 ? 0 : rgb.y;
	rgb.z = rgb.z < 0 ? 0 : rgb.z;
	
	//Rec.709
	rgb.x = rgb.x < 0.018 ? 4.5*rgb.x : 1.099*_powf(rgb.x, 0.45f) - 0.099;
    rgb.y = rgb.y < 0.018 ? 4.5*rgb.y : 1.099*_powf(rgb.y, 0.45f) - 0.099;
    rgb.z = rgb.z < 0.018 ? 4.5*rgb.z : 1.099*_powf(rgb.z, 0.45f) - 0.099;

    return rgb;
}