Conversion between sRGB and linear color encoding

srgb.glsl

vec3 sRGBToLinear(vec3 rgb)
{
  // See https://gamedev.stackexchange.com/questions/92015/optimized-linear-to-srgb-glsl
  return mix(pow((rgb + 0.055) * (1.0 / 1.055), vec3(2.4)),
             rgb * (1.0/12.92),
             lessThanEqual(rgb, vec3(0.04045)));
}

vec3 LinearToSRGB(vec3 rgb)
{
  // See https://gamedev.stackexchange.com/questions/92015/optimized-linear-to-srgb-glsl
  return mix(1.055 * pow(rgb, vec3(1.0 / 2.4)) - 0.055,
             rgb * 12.92,
             lessThanEqual(rgb, vec3(0.0031308)));
}