LYGIA Shader Library

Use:

rgb2YPbPr(<vec3|vec4> color)

Check it on Github

#ifndef FNC_RGB2YPBPR
#define FNC_RGB2YPBPR

#ifdef YPBPR_SDTV
const mat3 rgb2YPbPr_mat = mat3( 
    .299, -.169,  .5,
    .587, -.331, -.419,
    .114,  .5,   -.081
);
#else
const mat3 rgb2YPbPr_mat = mat3( 
    0.2126, -0.1145721060573399,   0.5,
    0.7152, -0.3854278939426601,  -0.4541529083058166,
    0.0722,  0.5,                 -0.0458470916941834
);
#endif

vec3 rgb2YPbPr(in vec3 rgb) {
    return rgb2YPbPr_mat * rgb;
}

vec4 rgb2YPbPr(in vec4 rgb) {
    return vec4(rgb2YPbPr(rgb.rgb),rgb.a);
}
#endif

Use:

rgb2YPbPr(<float3|float4> color)

Check it on Github

#ifndef FNC_RGB2YPBPR
#define FNC_RGB2YPBPR

#ifdef YPBPR_SDTV
const float3x3 rgb2YPbPr_mat = float3x3( 
    .299, -.169,  .5,
    .587, -.331, -.419,
    .114,  .5,   -.081
);
#else
const float3x3 rgb2YPbPr_mat = float3x3( 
    0.2126, -0.1145721060573399,   0.5,
    0.7152, -0.3854278939426601,  -0.4541529083058166,
    0.0722,  0.5,                 -0.0458470916941834
);
#endif

float3 rgb2YPbPr(in float3 rgb) {
    return mul(rgb2YPbPr_mat, rgb);
}

float4 rgb2YPbPr(in float4 rgb) {
    return float4(rgb2YPbPr(rgb.rgb),rgb.a);
}
#endif

Check it on Github

// #ifdef YPBPR_SDTV
// const rgb2YPbPr_mat = mat3x3<f32>( 
//     vec3<f32>(0.299, -0.169,  0.5),
//     vec3<f32>(0.587, -0.331, -0.419),
//     vec3<f32>(0.114,  0.5,   -0.081)
// );
// #else
const rgb2YPbPr_mat = mat3x3<f32>( 
    vec3<f32>(0.2126, -0.1145721060573399,   0.5),
    vec3<f32>(0.7152, -0.3854278939426601,  -0.4541529083058166),
    vec3<f32>(0.0722,  0.5,                 -0.0458470916941834)
);
// #endif

fn rgb2YPbPr(rgb: vec3<f32>) -> vec3<f32> {
    return rgb2YPbPr_mat * rgb;
}