I'm glad someone found objn64 useful :) looking back it could've been optimized better but it was Good Enough when I wrote it. I think someone added png texture support at some point. I was going to add CI8 conversion, but never got around to it.
On the subject of XBUS vs FIFO, I trialled both in a demo I wrote with a variety of loads. Benchmarking revealed that over 3 minutes each method was under a second long or shorter. So in time messing with them I never found XBUS to help with contention. I'm sure in some specific application it might be a bit better than FIFO.
By the way, I used a 64k FIFO size, which is huge. I don't know if that gave me better results.
On the subject of XBUS vs FIFO, I trialled both in a demo I wrote with a variety of loads. Benchmarking revealed that over 3 minutes each method was under a second long or shorter. So in time messing with them I never found XBUS to help with contention. I'm sure in some specific application it might be a bit better than FIFO. By the way, I used a 64k FIFO size, which is huge. I don't know if that gave me better results.