English Amiga Board - View Single Post - Games where the Atari ST version was.....

frank_b · 26 February 2017, 14:11

Mcoder must have tried using Atari's generic bitblt function from the blitter manual. That has a ridiculous overhead as it's really generic. I used MCoders sprite technique (it's clever) in the blitter intro I released on Atari forum. It's 2.8 times slower than using the ST blitter Don't take my word for it. Download the intro/benchmark and see. Even preshifting was slower than brute force AND/OR masking. You cannot beat 24 cycles a word for fully masking on a 68k. Hardware always wins. Here's an ST (not STe) game which mandates using the blitter. [ Show youtube player ] It's doing double duty drawing sprites and scrolling the screen. It runs at 50hz.

26 February 2017, 14:11	#81
frank_b Registered User Join Date: Jun 2008 Location: Boston USA Posts: 466	Mcoder must have tried using Atari's generic bitblt function from the blitter manual. That has a ridiculous overhead as it's really generic. I used MCoders sprite technique (it's clever) in the blitter intro I released on Atari forum. It's 2.8 times slower than using the ST blitter Don't take my word for it. Download the intro/benchmark and see. Even preshifting was slower than brute force AND/OR masking. You cannot beat 24 cycles a word for fully masking on a 68k. Hardware always wins. Here's an ST (not STe) game which mandates using the blitter. [ Show youtube player ] It's doing double duty drawing sprites and scrolling the screen. It runs at 50hz.