Amiga blitter, copper, and sprite demo written in C and assembler for my Blitter video
https://makertube.net/w/eV545ku522sRq8CTcxDuFZ
John Bintz
e19f59246e
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|---|---|---|
| images | ||
| old | ||
| system | ||
| .ccls | ||
| .gitignore | ||
| .rubocop.yml | ||
| 32x50 | ||
| 32x50_bun.c | ||
| NOTES.md | ||
| README.md | ||
| agnus.png | ||
| basics | ||
| basics.s | ||
| better_startup | ||
| better_startup.c | ||
| blitter_speed_test | ||
| blitter_speed_test.c | ||
| blitter_speed_test.q | ||
| blitter_test | ||
| blitter_test.c | ||
| bun.c | ||
| bun.h | ||
| bun_test | ||
| bun_test.c | ||
| copper-colors | ||
| image_converter.rb | ||
| images.s | ||
| keyboard_interrupt | ||
| keyboard_interrupt.c | ||
| main | ||
| main.c | ||
| marquee.svg | ||
| mask-bitplane | ||
| screen.c | ||
| screen.h | ||
| smakefile | ||
| sprite-copperlist | ||
| sprite-data | ||
| topaz-bitplane | ||
| topaz-narrow.png | ||
| topaz.png | ||
| topaz2.png | ||
| types.h | ||
README.md
Running
main
This will get 50FPS on an 020, and 25 or lower on an 68EC020 and below. There's a branch related to precaching even more to get the speed faster but I'm defering that until later.
The best way I can think of to make this ridiculously fast is for a script in Ruby or Python to calculate every blitter register for every frame of data for bun renders and clears, store that in a list of words, and rip through those lists in Assembler, shotgunning the values directly into the registers without the C code needing to track bun positions and bun clears. That's a project for another day.
Building
Vamos
You'll want Vamos and SAS/C on Vamos's path:
ruby ./image_converter.rb && touch images.s && vamos -- smake