Thanks! Out of curiosity, do you know if the PSX is using a Digital Differential Analyzer (DDA), or some other algorithm?

Does anyone know what rasterization algorithm the PSX uses? I've tried looking around, but didn't really find much. I read that seams and gaps are no uncommon, and that when you draw a 4-point polygon rectangle, it will be rasterized as 2 3-point polygons and the bottom-right edge will not be raster...

Thank you very much for your answer! That clarified a lot of open questions I had in one go :) Especially the part of the buffer being circular (if I understood correctly that is how you are overwriting the whole buffer with NOPs while the first two commands are being processed) is very interesting....

Hey guys,

I'm working on a PSX project and I was wondering: what happens when you write to GP0 when the GPU is not ready to receive a command weird? Does what you write go to a buffer and gets processed later? What if the buffer is full? Or does it just get discarded?

Thanks in advance!