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PTDS

"Native" chunky screens system [Amiga] · By RETREAM

m68k Linux?

A topic by Chewi created 83 days ago Views: 55 Replies: 3
Viewing posts 1 to 3

Hello! I stumbled across this just today. Seriously impressive stuff. I may give it a whirl next time I fire up my 1200. What I'm really wondering though is whether this technique could be used under Linux. I maintain Gentoo Linux for m68k, and while it was fun to show off at FOSDEM, the lack of planar graphics support makes the poor thing look much more primitive than it should. Some C2P code was written for X11, but it's so horribly slow that I've never really seen it working on my 68030. I was thinking it could be most effective in the kernel or SDL. Or perhaps I've misunderstood and this technique cannot simply be applied to traditional chunky graphics code.

Developer (3 edits)

Thank you.

PTDS is a way to set up the Amiga display hardware in order to have it display a chunky framebuffer without any C2P conversion. It is not tied to any OS or language.
That said, it is definitely not suitable as a generic graphics driver due to its low resolution, approximate color output and limited colors. PTDQ offers higher resolution, more clarity and more colors, but it also requires C2P (although faster than the traditional one) and still has limited resolution (the equivalent of LORES).

I see, thanks. I did spot PTDQ too, but I figured speed over quality might be better in this case. LORES isn't great but better than a pure text console. I'll try and give it a look sometime.

Developer (5 edits)

Feel free to experiment. I'm just glad if anyone finds a use for PTDQ/PTDS.

Just for clarity: the tradeoff for speed is that PTDS' horizontal resolution is internally half of LORES', even if, physically, the screen area is the same (dots are spaced by automatically interpolated dots - for a full explanation, please refer to the documentation); the splash screens of the PVE or Zoomaniac demos will give you a good idea of what texts look like in PTDS - any of why PTDQ is preferrable for such use.