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
