//--------------------------------------------------------------------------------------
// YCbCrPS2.hlsl
//--------------------------------------------------------------------------------------
Texture2D image : register(t0);

SamplerState def_sampler : register(s0);

cbuffer ColorMatrix : register(b0) {
	float4 color_vec_y;
	float4 color_vec_u;
	float4 color_vec_v;
};

struct PS_INPUT
{
	float4 pos : SV_POSITION;
	float2 tex : TEXCOORD;
};

//--------------------------------------------------------------------------------------
// Pixel Shader
//--------------------------------------------------------------------------------------
float PS(PS_INPUT frag_in) : SV_Target
{
	float3 rgb = image.Load(int3(frag_in.pos.xy, 0)).rgb;
	float y = dot(color_vec_y.xyz, rgb) + color_vec_y.w;

	return y;
}