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Contents
/**
* Converts a CIE Yxy color to RGB.
* <p>The conversion is described in
* <a href="http://content.gpwiki.org/index.php/D3DBook:High-Dynamic_Range_Rendering#Luminance_Transform">Luminance Transform</a>
* </p>
*
* @name czm_XYZToRGB
* @glslFunction
*
* @param {vec3} Yxy The color in CIE Yxy.
*
* @returns {vec3} The color in RGB.
*
* @example
* vec3 xyz = czm_RGBToXYZ(rgb);
* xyz.x = max(xyz.x - luminanceThreshold, 0.0);
* rgb = czm_XYZToRGB(xyz);
*/
vec3 czm_XYZToRGB(vec3 Yxy)
{
const mat3 XYZ2RGB = mat3( 3.2405, -0.9693, 0.0556,
-1.5371, 1.8760, -0.2040,
-0.4985, 0.0416, 1.0572);
vec3 xyz;
xyz.r = Yxy.r * Yxy.g / Yxy.b;
xyz.g = Yxy.r;
xyz.b = Yxy.r * (1.0 - Yxy.g - Yxy.b) / Yxy.b;
return XYZ2RGB * xyz;
}
Version data entries
8 entries across 8 versions & 1 rubygems