32 lines
714 B
GLSL
32 lines
714 B
GLSL
/**
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* Converts an HSL color (hue, saturation, lightness) to RGB
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* HSL <-> RGB conversion: {@link http://www.chilliant.com/rgb2hsv.html}
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*
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* @name czm_HSLToRGB
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* @glslFunction
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*
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* @param {vec3} rgb The color in HSL.
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*
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* @returns {vec3} The color in RGB.
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*
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* @example
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* vec3 hsl = czm_RGBToHSL(rgb);
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* hsl.z *= 0.1;
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* rgb = czm_HSLToRGB(hsl);
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*/
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vec3 hueToRGB(float hue)
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{
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float r = abs(hue * 6.0 - 3.0) - 1.0;
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float g = 2.0 - abs(hue * 6.0 - 2.0);
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float b = 2.0 - abs(hue * 6.0 - 4.0);
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return clamp(vec3(r, g, b), 0.0, 1.0);
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}
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vec3 czm_HSLToRGB(vec3 hsl)
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{
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vec3 rgb = hueToRGB(hsl.x);
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float c = (1.0 - abs(2.0 * hsl.z - 1.0)) * hsl.y;
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return (rgb - 0.5) * c + hsl.z;
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}
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