I didn’t get as much time this week to work on it as I wanted but I did implement some of the ideas from last week’s discussion. I changed the array of structs to structs of arrays. This was a minor win really since I did a bunch to reduce the cost of the old implementation already. The big change is that I implemented the code to redraw the dirty tiles right after the beam. I am using the vertical counter in $e0c02e and $e0c02f to do this. By doing this, the background is already redrawn by the time the beam hits the bottom and I only need to draw bugs and update game state before the next frame. With this, I am almost smooth again on 2.8MHz. This is 2.8MHz on GSPlus. I haven’t tried it on real HW yet though so buyer beware.
Quality Apple // Software and Tools since 2012