Bend the Blitter by Loonies [web]
Bend the Blitter An Amiga AGA demo for the Gerp 2026 No CPU Amiga Demo compo Big thanks to Facet and Slumgud for jumping to the rescue at the party when I needed graphics for the demo. To save you from the eye strain of reading the scroller, here's a full transcription: Hello Gerp! Blueberry at the keys... Hope you are enjoying the NO-CPU compo so far! I am so curious to see what you have all come up with for this installment. 2025 was the year of NO-CPU and the year of rotozoomers. Come 2026, I thought it could be fun to combine the two. Plain AGA copperchunky, 80 x 50 chunks. Not a record as rotozoomer specs go, just a little proof-of-concept demonstration of a cute little technique I came up with... I call it "Blitter Bending". It involves cycle accurate writes to blitter modulo while the blitter is running. The usual 68000 unrolled texel fetch takes 20 cycles per move. With this trick, the copper and blitter in unison can do it in just 8 cycles. Your turn. (And yes, turning off audio channels is cheating.) Credits for this little thing... Code by Blueberry Picture by Facet Font by Allanon Music by CS-Jay and Slide Greetings to everybody who keeps pushing the Amiga!
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