LYGIA Shader Library

Use:

YPbPr2RGB(<vec3|vec4> color)

Check it on Github

#ifndef FNC_YPBPR2RGB
#define FNC_YPBPR2RGB

#ifdef YPBPR_SDTV
const mat3 YPbPr2rgb_mat = mat3( 
    1.,     1.,       1.,
    0.,     -.344,    1.772,
    1.402,  -.714,    0.
);
#else
const mat3 YPbPr2rgb_mat = mat3( 
    1.,     1.,       1.,
    0.,     -.187,    1.856,
    1.575,  -.468,    0.
);
#endif

vec3 YPbPr2rgb(in vec3 rgb) {
    return YPbPr2rgb_mat * rgb;
}

vec4 YPbPr2rgb(in vec4 rgb) {
    return vec4(YPbPr2rgb(rgb.rgb),rgb.a);
}
#endif

Use:

YPbPr2RGB(<float3|float4> color)

Check it on Github

#ifndef FNC_YPBPR2RGB
#define FNC_YPBPR2RGB

#ifdef YPBPR_SDTV
const float3x3 YPbPr2rgb_mat = float3x3( 
    1.,     1.,       1.,
    0.,     -.344,    1.772,
    1.402,  -.714,    0.
);
#else
const float3x3 YPbPr2rgb_mat = float3x3( 
    1.,     1.,       1.,
    0.,     -.187,    1.856,
    1.575,  -.468,    0.
);
#endif

float3 YPbPr2rgb(in float3 rgb) {
    return mul(YPbPr2rgb_mat, rgb);
}

float4 YPbPr2rgb(in float4 rgb) {
    return float4(YPbPr2rgb(rgb.rgb),rgb.a);
}
#endif

Check it on Github

// #ifdef YPBPR_SDTV
// const YPbPr2rgb_mat = mat3x3<f32>( 
//     vec3<f32>(1.0,     1.0,      1.0),
//     vec3<f32>(0.0,    -0.344,    1.772),
//     vec3<f32>(1.402,  -0.714,    0.0)
// );
// #else
const YPbPr2rgb_mat = mat3x3<f32>( 
    vec3<f32>(1.0,     1.0,      1.0),
    vec3<f32>(0.0,    -0.187,    1.856),
    vec3<f32>(1.575,  -0.468,    0.0)
);
// #endif

fn YPbPr2rgb(rgb: vec3<f32>) -> vec3<f32> {
    return YPbPr2rgb_mat * rgb;
}