On Mit, 2002-11-06 at 15:29, Keith Whitwell wrote: > Michel Dänzer wrote: > > On Die, 2002-11-05 at 09:41, Keith Whitwell wrote: > > > >>Michel Dänzer wrote: > >> > >>>On Mon, 2002-11-04 at 21:11, Ian Romanick wrote: > >>> > >>> > >>>>On Sun, Nov 03, 2002 at 04:58:23PM +0100, Michel Dänzer wrote: > >>>> > >>>> > >>>>>http://penguinppc.org/~daenzer/DRI/bzflag.png > >>>>>http://penguinppc.org/~daenzer/DRI/tuxracer.png > >>>>> > > > > [...] > > > > > >>>It's definitely the depth buffer running amok. If I move the texture > >>>region about 10 scanlines further away from it, no corruption occurs. > >>>Any ideas as to why this could happen appreciated, and why it doesn't > >>>happen on the x86 box at work, where the texture region is adjacent to > >>>the depth buffer. > >>> > >>Access to the depth buffer is tiled, which means that pixel (x,y) isn't > >>necessarily at (x,y), but could be some distance up or down from there. It > >>may be that the region we're allocating for the depth buffer which would be > >>large enough if it were all layed out linearly, but isn't large enough for the > >>tiles. It's worth investigating as we've seen similar problems elsewhere. > >> > > > > Ah, tiling. I couldn't find any juicy info about it in the docs, but > > reading the depth buffer access functions in radeon_span.c, it seems > > that it basically partitions the buffer into blocks of 16 lines, which > > are scrambled somehow? Correct me if I'm wrong, otherwise I'll commit > > http://penguinppc.org/~daenzer/DRI/radeon-depth-size.diff , which Works > > For Me (TM). > > Looks good. Can you also cast an eye over the r200_span.c equivalents to make > sure 16 is the number for r200 as well?
Yep, looks that way ( ((y & 0x3FF) >> 4) * ... + ... ). Committed. -- Earthling Michel Dänzer (MrCooper)/ Debian GNU/Linux (powerpc) developer XFree86 and DRI project member / CS student, Free Software enthusiast ------------------------------------------------------- This sf.net email is sponsored by: See the NEW Palm Tungsten T handheld. Power & Color in a compact size! http://ads.sourceforge.net/cgi-bin/redirect.pl?palm0001en _______________________________________________ Dri-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/dri-devel
