rgb2hsl (`lygia`/`color`/`space`/`rgb2hsl`)

Convert from linear RGB to HSL. Based on work by Sam Hocevar and Emil Persson

Dependencies:

Use:

``````<vec3|vec4> rgb2hsl(<vec3|vec4> rgb)
``````

Check it on Github

``````

#ifndef HSL_EPSILON
#define HSL_EPSILON 1e-10
#endif

#ifndef FNC_RGB2HSL
#define FNC_RGB2HSL
vec3 rgb2hsl(const in vec3 rgb) {
vec3 HCV = rgb2hcv(rgb);
float L = HCV.z - HCV.y * 0.5;
float S = HCV.y / (1.0 - abs(L * 2.0 - 1.0) + HSL_EPSILON);
return vec3(HCV.x, S, L);
}
vec4 rgb2hsl(const in vec4 rgb) { return vec4(rgb2hsl(rgb.xyz),rgb.a);}
#endif
``````

Dependencies:

Use:

``````<float3|float4> rgb2hsl(<float3|float4> rgb)
``````

Check it on Github

``````

#ifndef HSL_EPSILON
#define HSL_EPSILON 1e-10
#endif

#ifndef FNC_RGB2HSL
#define FNC_RGB2HSL
float3 rgb2hsl(float3 rgb) {
float3 HCV = rgb2hcv(rgb);
float L = HCV.z - HCV.y * 0.5;
float S = HCV.y / (1.0 - abs(L * 2.0 - 1.0) + HSL_EPSILON);
return float3(HCV.x, S, L);
}
float4 rgb2hsl(float4 rgb) { return float4(rgb2hsl(rgb.xyz),rgb.a);}
#endif
``````

Dependencies:

Check it on Github

``````

fn rgb2hsl(rgb: vec3f) -> vec3f {
let HCV = rgb2hcv(rgb);
let L = HCV.z - HCV.y * 0.5;
let S = HCV.y / (1.0 - abs(L * 2.0 - 1.0) + 1e-10);
return vec3f(HCV.x, S, L);
}
``````