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Contents
//This file is automatically rebuilt by the Cesium build process.
/*global define*/
define(function() {
"use strict";
return "/**\n\
* Converts a CIE Yxy color to RGB.\n\
* <p>The conversion is described in\n\
* <a href=\"http://content.gpwiki.org/index.php/D3DBook:High-Dynamic_Range_Rendering#Luminance_Transform\">Luminance Transform</a>\n\
* </p>\n\
* \n\
* @name czm_XYZToRGB\n\
* @glslFunction\n\
* \n\
* @param {vec3} Yxy The color in CIE Yxy.\n\
*\n\
* @returns {vec3} The color in RGB.\n\
*\n\
* @example\n\
* vec3 xyz = czm_RGBToXYZ(rgb);\n\
* xyz.x = max(xyz.x - luminanceThreshold, 0.0);\n\
* rgb = czm_XYZToRGB(xyz);\n\
*/\n\
vec3 czm_XYZToRGB(vec3 Yxy)\n\
{\n\
const mat3 XYZ2RGB = mat3( 3.2405, -0.9693, 0.0556,\n\
-1.5371, 1.8760, -0.2040,\n\
-0.4985, 0.0416, 1.0572);\n\
vec3 xyz;\n\
xyz.r = Yxy.r * Yxy.g / Yxy.b;\n\
xyz.g = Yxy.r;\n\
xyz.b = Yxy.r * (1.0 - Yxy.g - Yxy.b) / Yxy.b;\n\
\n\
return XYZ2RGB * xyz;\n\
}\n\
";
});
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