LYGIA Shader Library

Dependencies:

• lygia/v1.2.0/color/space/srgb2rgb.glsl
• lygia/v1.2.0/color/space/rgb2srgb.glsl

Use:

<vec3\vec4> mixOklab(<vec3|vec4> colorA, <vec3|vec4> colorB, float pct)

Check it on Github

#ifndef FNC_MIXOKLAB
#define FNC_MIXOKLAB
vec3 mixOklab( vec3 colA, vec3 colB, float h ) {

    #ifdef MIXOKLAB_COLORSPACE_SRGB
    colA = srgb2rgb(colA);
    colB = srgb2rgb(colB);
    #endif

    // https://bottosson.github.io/posts/oklab
    const mat3 kCONEtoLMS = mat3(                
         0.4121656120,  0.2118591070,  0.0883097947,
         0.5362752080,  0.6807189584,  0.2818474174,
         0.0514575653,  0.1074065790,  0.6302613616);
    const mat3 kLMStoCONE = mat3(
         4.0767245293, -1.2681437731, -0.0041119885,
        -3.3072168827,  2.6093323231, -0.7034763098,
         0.2307590544, -0.3411344290,  1.7068625689);

    // rgb to cone (arg of pow can't be negative)
    vec3 lmsA = pow( kCONEtoLMS * colA, vec3(1.0/3.0) );
    vec3 lmsB = pow( kCONEtoLMS * colB, vec3(1.0/3.0) );
    // lerp
    vec3 lms = mix( lmsA, lmsB, h );

    // cone to rgb
    vec3 rgb = kLMStoCONE*(lms*lms*lms);

    #ifdef MIXOKLAB_COLORSPACE_SRGB
    return rgb2srgb(rgb);
    #else
    return rgb;
    #endif
}

vec4 mixOklab( vec4 colA, vec4 colB, float h ) {
    return vec4( mixOklab(colA.rgb, colB.rgb, h), mix(colA.a, colB.a, h) );
}
#endif

Dependencies:

• lygia/v1.2.0/color/space/srgb2rgb.glsl
• lygia/v1.2.0/color/space/rgb2srgb.glsl

Use:

<float3\float4> mixOklab(<float3|float4> colorA, <float3|float4> colorB, float pct)

Check it on Github

#ifndef FNC_MIXOKLAB
#define FNC_MIXOKLAB
float3 mixOklab( float3 colA, float3 colB, float h ) {

    #ifdef MIXOKLAB_COLORSPACE_SRGB
    colA = srgb2rgb(colA);
    colB = srgb2rgb(colB);
    #endif

    // https://bottosson.github.io/posts/oklab
    const float3x3 kCONEtoLMS = float3x3(                
         0.4121656120,  0.2118591070,  0.0883097947,
         0.5362752080,  0.6807189584,  0.2818474174,
         0.0514575653,  0.1074065790,  0.6302613616);
    const float3x3 kLMStoCONE = float3x3(
         4.0767245293, -1.2681437731, -0.0041119885,
        -3.3072168827,  2.6093323231, -0.7034763098,
         0.2307590544, -0.3411344290,  1.7068625689);

    float factor = 1.0/3.0;
    // rgb to cone (arg of pow can't be negative)
    float3 lmsA = pow( mul(kCONEtoLMS, colA), float3(factor, factor, factor) );
    float3 lmsB = pow( mul(kCONEtoLMS, colB), float3(factor, factor, factor) );
    // lerp
    float3 lms = lerp( lmsA, lmsB, h );

    // gain in the middle (no oaklab anymore, but looks better?)
    // lms *= 1.0+0.2*h*(1.0-h);

    // cone to rgb
    float3 rgb = mul(kLMStoCONE, lms*lms*lms);

    #ifdef MIXOKLAB_COLORSPACE_SRGB
    return rgb2srgb(rgb);
    #else
    return rgb;
    #endif
}

float4 mixOklab( float4 colA, float4 colB, float h ) {
    return float4( mixOklab(colA.rgb, colB.rgb, h), lerp(colA.a, colB.a, h) );
}
#endif

Check it on Github

fn mixOklab( colA: vec3f, colB: vec3f, h: f32 ) -> vec3f {
    let kCONEtoLMS = mat3x3<f32>(                
        vec3f(0.4121656120,  0.2118591070,  0.0883097947),
        vec3f(0.5362752080,  0.6807189584,  0.2818474174),
        vec3f(0.0514575653,  0.1074065790,  0.6302613616) );

    let kLMStoCONE = mat3x3<f32>(
        vec3f(4.0767245293, -1.2681437731, -0.0041119885),
        vec3f(-3.3072168827,  2.6093323231, -0.7034763098),
        vec3f(0.2307590544, -0.3411344290,  1.7068625689));

    // rgb to cone (arg of pow can't be negative)
    let lmsA = pow( kCONEtoLMS*colA, vec3f(1.0/3.0) );
    let lmsB = pow( kCONEtoLMS*colB, vec3f(1.0/3.0) );

    let lms = mix( lmsA, lmsB, h );

    // gain in the middle (no oaklab anymore, but looks better?)
    //lms *= 1.0+0.2*h*(1.0-h);

    // cone to rgb
    return kLMStoCONE*(lms*lms*lms);
}