sampler s0;

float4 main(float2 tex : TEXCOORD) : COLOR {
    // Fetch the original pixel
    float4 color = tex2D(s0, tex);

    // Limited to Full
    float3 expandedColor = (color.rgb - 0.0627) * 1.1644;

    // BT.2020 to REC.709 transformation matrix
    float3 transformedColor = float3(
        expandedColor.r * 1.6605 + expandedColor.g * -0.5876 + expandedColor.b * -0.0728,
        expandedColor.r * -0.1246 + expandedColor.g * 1.1329 + expandedColor.b * -0.0083,
        expandedColor.r * 0.0177 + expandedColor.g * -0.1006 + expandedColor.b * 1.0829
    );

    // Return the transformed color
    return float4(transformedColor, color.a);
}