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Couldn't immediately find a good explanation of what STAR1 and STAR2 were. Looks like it's 256x256 bitmap that's scrollable and cycles automatically through a c

by Bigpet 5y ago

Couldn't immediately find a good explanation of what STAR1 and STAR2 were. Looks like it's 256x256 bitmap that's scrollable and cycles automatically through a color palette. So you can make the stars "twinkle" by it just shifting through the palette https://github.com/mamedev/mame/blob/master/src/mame/video/cps1.cpp#L3162-L3186 https://github.com/mamedev/mame/blob/master/src/mame/video/c... edit: didn't see that "col" also contained an x-offset. So like (256*16)x256 but presumably "sparse", so I get more where the "star" idea comes from

allenu 5y ago
Thank you for sharing this. That was my first question, i.e. was the star background hardcoded (or at least statically generated)? That's super interesting that it was built-in at all. I suppose so many shooter games had starfield backgrounds that it made sense at the time to include it.