# LYGIA Shader Library

## yiq2rgb (`lygia`/`color`/`space`/`yiq2rgb`)

Convert a color in YIQ to linear RGB color. From https://en.wikipedia.org/wiki/YIQ

Use:

``````<vec3|vec4> yiq2rgb(<vec3|vec4> color)
``````

Check it on Github

``````
#ifndef FNC_YIQ2RGB
#define FNC_YIQ2RGB

const mat3 yiq2rgb_mat = mat3(1.0,  0.9469,  0.6235,
1.0, -0.2747, -0.6357,
1.0, -1.1085,  1.7020);

vec3 yiq2rgb(in vec3 yiq) {
return yiq2rgb_mat * yiq;
}

vec4 yiq2rgb(in vec4 yiq) {
return vec4(yiq2rgb(yiq.rgb), yiq.a);
}
#endif

``````

Use:

``````<float3|float4> yiq2rgb(<float3|float4> color)
``````

Check it on Github

``````
#ifndef FNC_YIQ2RGB
#define FNC_YIQ2RGB

const float3x3 yiq2rgb_mat = float3x3(
1.0,  0.9469,  0.6235,
1.0, -0.2747, -0.6357,
1.0, -1.1085,  1.7020
);

float3 yiq2rgb(in float3 yiq) {
return mul(yiq2rgb_mat, yiq);
}

float4 yiq2rgb(in float4 yiq) {
return float4(yiq2rgb(yiq.rgb), yiq.a);
}
#endif

``````

Check it on Github

``````const yiq2rgb_mat : mat3x3<f32>  = mat3x3<f32>(
vec3<f32>(1.0,  0.9469,  0.6235),
vec3<f32>(1.0, -0.2747, -0.6357),
vec3<f32>(1.0, -1.1085,  1.7020) );

fn yiqToRgb(yiq : vec3<f32>) -> vec3<f32> {
return yiq2rgb_mat * yiq;
}
``````

## License

LYGIA is dual-licensed under the Prosperity License and the Patron License for sponsors and contributors.

Sponsors and contributors are automatically added to the Patron License and they can ignore the any non-commercial rule of the Prosperity Licensed software (please take a look to the exception).

It's also possible to get a permanent comercial license hook to a single and specific version of LYGIA.

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