sampler s0 : register(s0);

float4 p0 : register(c0);



#define height (p0[1])



float4 main(float2 tex : TEXCOORD0) : COLOR

{

	// original pixel

	float4 c0 = tex2D(s0,tex);



	// uncomment to activate for HD only

	/*

	if(height > 719)

	{

		return c0;

	}

	*/



	// r=c0[0], g=c0[1], b=c0[2]

	// RGB [16,235] to YUV: 601 mode (128 is not added to Cb and Cr)

	float y=0.299*c0[0] + 0.587*c0[1] + 0.114*c0[2];

	float Cb=-0.172*c0[0] -0.339*c0[1] +0.511*c0[2];

	float Cr=0.511*c0[0] -0.428*c0[1] -0.083*c0[2];



	// YUV to RGB [16,235]: 709 mode (Cb and Cr are 128 less)

	float r=y+1.540*Cr;

	float g=y-0.459*Cr-0.183*Cb;

	float b=y+1.816*Cb;



	return float4(r,g,b,0);

}

