Cool Bun Demo

Built for The Obligatory Amiga Blitter Video.

Uses a bunch of C and Assembler code to drive the blitter, sprites, and copper to display high color Topaz art overtop of flying cool bun logos.

Running

Click the mouse to escape any demo.

• main: Main demo
• 32x50, 33x50, left_side, right_side: Rendering Cool Bun in various locations on screen.
• any_position: Cool Bun flies around like a DVD player pause screen.
• keyboard_interrupt: Tests using input.device to access the keyboard.
• blitter_speed_test: Get the speed of blitter vs. CPU memory operations
• bun_test: Run some unit tests (yes, really!)

This will get 50 fps on an 020, and 25 or lower on an 68EC020 and below.

Building

Vamos

You'll want Vamos, and SAS/C & GenAm from DevPac on Vamos's path:

# main
ruby ./image_converter.rb && touch images.s && vamos -- smake

# any others
vamos -- smake <other>

The image converter requires Ruby 3.2.4 and RMagick installed.

Performance

The best way I can think of to make this way faster 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.