If there are multiple playfields/layers and sprites/objects aren't mixing between them some pseudo 3d (Like layer separation, not object depth) should be possible. It would probably work better on arcade hardware (neo-geo) but some amiga games should also work fine.
Back layer gets no depth, next layer some and so on. The filter would have settings for degree of stereo separation for the layers (0 as flat or don't do depth for that layer, negative positive). That should make it somewhat generic, since a user could tweak the setting per game.
Last edited by spiff; 10 August 2011 at 01:12.