Flicker in bottom few tile rows of screen. #41
Description
Whenever a sprite moves within the bottom few tiles, those rows flicker and get very ugly.
I suspect this is because the RSP hadn't quite finished rendering the last rows before being asked to render the new ones.
I think the fix here is to have some way for the RSP to signal that it is done and not interrupt it with a new render request. Just skip that frame.
There is also scope for optimising the RSP code - take advantage of delay slots where possible and avoid repeating a few calculations.