One thing needs to be added here and since we're already answering with a year delay (plus it was quite high in google results - grats!)... As far as I know most games are projected on a flat surface which causes distortion similar to cameras (except lens effects) and thus is corrected by flatness of the screen. Exceptions that I know of are some racing games which make software corrections for triple monitor setups and card manufacturers projecting on more than one plane which is essential for VR.
