function validateTonemapper(tonemapper) {
  return (
    tonemapper === Tonemapper.REINHARD ||
    tonemapper === Tonemapper.MODIFIED_REINHARD ||
    tonemapper === Tonemapper.FILMIC ||
    tonemapper === Tonemapper.ACES ||
    tonemapper === Tonemapper.PBR_NEUTRAL
  );
}
Validate whether the provided value is a known Tonemapper type
@private

@param {string} tonemapper