jtBaseApp/node_modules/@cesium/engine/Source/Shaders/Builtin/Functions/linearToSrgb.glsl

/**
 * Converts a linear RGB color to an sRGB color.
 *
 * @param {vec3|vec4} linearIn The color in linear color space.
 * @returns {vec3|vec4} The color in sRGB color space. The vector type matches the input.
 */
vec3 czm_linearToSrgb(vec3 linearIn) 
{
    return pow(linearIn, vec3(1.0/2.2));
}

vec4 czm_linearToSrgb(vec4 linearIn) 
{
    vec3 srgbOut = pow(linearIn.rgb, vec3(1.0/2.2));
    return vec4(srgbOut, linearIn.a);
}