// Packing a [0-1] float value into a 4D vector where each component will be a 8-bits integer
vec4 packFloatToVec4i(const float value)
{
   const vec4 bitSh = vec4(256.0 * 256.0 * 256.0, 256.0 * 256.0, 256.0, 1.0);
   const vec4 bitMsk = vec4(0.0, 1.0 / 256.0, 1.0 / 256.0, 1.0 / 256.0);
   vec4 res = fract(value * bitSh);
   res -= res.xxyz * bitMsk;
   return res;
}
 
// Unpacking a [0-1] float value from a 4D vector where each component was a 8-bits integer
float unpackFloatFromVec4i(const vec4 value)
{
   const vec4 bitSh = vec4(1.0 / (256.0 * 256.0 * 256.0), 1.0 / (256.0 * 256.0), 1.0 / 256.0, 1.0);
   return(dot(value, bitSh));
}