25 lines
651 B
GLSL
25 lines
651 B
GLSL
/**
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* Converts an HSB color (hue, saturation, brightness) to RGB
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* HSB <-> RGB conversion with minimal branching: {@link http://lolengine.net/blog/2013/07/27/rgb-to-hsv-in-glsl}
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*
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* @name czm_HSBToRGB
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* @glslFunction
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*
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* @param {vec3} hsb The color in HSB.
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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 hsb = czm_RGBToHSB(rgb);
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* hsb.z *= 0.1;
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* rgb = czm_HSBToRGB(hsb);
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*/
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const vec4 K_HSB2RGB = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
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vec3 czm_HSBToRGB(vec3 hsb)
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{
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vec3 p = abs(fract(hsb.xxx + K_HSB2RGB.xyz) * 6.0 - K_HSB2RGB.www);
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return hsb.z * mix(K_HSB2RGB.xxx, clamp(p - K_HSB2RGB.xxx, 0.0, 1.0), hsb.y);
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}
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