Re: help getting hw-accel OpenGL on Pismo
On Tue, 2003-09-09 at 16:55, John M. Gabriele wrote:
> >On Tue, 2003-09-09 at 10:40, John M. Gabriele wrote:
> >> I'm trying to get hardware-accelerated OpenGL working. The Powerbook
> >> comes with an ATI Rage 128 Mobility M3, 66 MHz AGP 2x (rev. 02) bus
> >> and the card has 8 MB SDRAM. Standard 1024x768 display.
> >
> >I've got some info up about the iBook (with same graphics setup) on
> >http://www.flamingspork.com/linux/ibook/
> >
>
> Thanks for the reply. Your site mentions:
> |
> | The trick is: 16 bit color only! Yes, that will get DRM
> | going on an 8MB Rage128 Mobility.
>
> I'll try that when I get home, but...
>
> | It's a bitch, OSX can do
> | it in Millions of Colors, so why can't X?
>
> That's a very good question. Does anyone here have an
> answer?
Because the DRI uses shared front, back, depth and stencil buffers. This
may change in the future, but hardly anytime soon.
> 8 MB should be plenty for a 32 bpp 1024x768 double-buffered
> display (1024 x 768 x 32 / 8 / 1024 / 1024 = 3 MB, for 2
> buffers (front and back) that's 6 MB required).
You forgot the depth and stencil buffers, which together also take up 4
bytes per pixel.
--
Earthling Michel Dänzer \ Debian (powerpc), XFree86 and DRI developer
Software libre enthusiast \ http://svcs.affero.net/rm.php?r=daenzer
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