On Thu, 28 Nov 2002, Geert Uytterhoeven wrote:

On 25 Nov 2002, Johan Bolmsjo wrote:

quoted

For what it's worth, the interleaved modes on atari works like this:

The bitplanes are interleaved on 16 bit big-endian word basis so if you
have two bitplanes, bit 0 of the first 16 pixels would be in the first
16 bit word in the display memory, bit 1 of the first 16 pixels would be
in the second word. With bit 0 I mean as masked out by & 0x0001 in C,
and bit 1 as masked out by 0x0002.

Thanks! This is exactly the kind of information I needed!

I added simple unoptimized support for Atari interleaved bitplanes to fbtest.
When I know I got the basics right, I can start writing optimized drawing
routines.

Anyone who cares to give it a try? Just check out CVS module `fbtest' from
http://sourceforge.net/cvs/?group_id=908, type `make' and run `fbtest' for all
available color depths (use fbset first), and tell me whether it works.

If no one is left with an Atari with Linux/m68k installed, I can create a
ramdisk containing fbset and fbtest, so you just need ataboot and a kernel to
test it.

I put the ramdisk at

    http://home.tvd.be/cr26864/Linux/m68k/ramdisk-fbtest-m68k.gz

Just boot it with whatever kernel (incl. atafb, of course) you have, and run
`fbtest' for all available color depths. You can change the color depth with
`fbset -depth <depth>'. Note that it will be slow, since so far I implemented
single pixel drawing only.

Thanks for testing!

Gr{oetje,eeting}s,

						Geert

P.S. Sorry that it took that long, but my Amiga 4000 needed urgent surgery due
     to a leaking NiCd battery that started to corrode the mainboard.
     Fortunately I managed to replace it in time by a new NiMH part.
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds



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