On Mon, Dec 20, 2004 at 04:39:03PM +0100, Felix Kühling wrote: > Hi Keith, > > I'm attaching my current solution for the Savage driver. I'm going to > commit this later today. It doesn't need any modifications of the common > TNL code. It is probably not the most efficient solution though, since > it requires an indirect function call for each emitted vertex. That > said, I havn't noticed any performance regressions which may be because > the Savage hardware is quite slow in relation to my CPU (mobile Athlon > XP 2000+). > > Also see my comments below ... > > Am Sa, den 18.12.2004 schrieb Keith Whitwell um 0:37: > > Felix Kühling wrote: > > > Am Fr, den 17.12.2004 schrieb Keith Whitwell um 22:59: > [snip] > > >>Secondly, is the obvious counter-concern -- what happens with clipping? > > >> The 'post processing' probably needs to be undone so that clipping can > > >>proceed, then be re-done on the clipped vertices, right? > > > > > > > > > Right. But that would have been broken with t_dd_vbtmp.h too. ;-) > > > > No, t_dd_vbtmp.h *does* undo the projection, look around line 534. > > Ok, sorry. I missed that detail. Though I do have a question about this > code: > > rqdst = 1.0 / qdst; > dst->v.u0 *= rqdst; > dst->v.v0 *= rqdst; > dst->v.w *= rqdst; > > Shouldn't the last line say: > > dst->v.w *= qdst; > > I don't claim to understand the math behind this completely, but that > would be the analogue thing to the code around line 277. > > [ ... your other reply ... ] > > > I can think of the i810 and mga which both have this projective texture > > issue *and* have the fast path (in i810render.c and mga_render.c > > respectively). It (used to be?) a worthwhile optimization. > > I didn't know about the i810 driver. But in the MGA driver the render > stage is disabled. AFAICT it has been since the transition to Mesa 4.
I have the render stage working with the Mesa 5 code I use with DirectFBGL. -- Ville Syrjälä [EMAIL PROTECTED] http://www.sci.fi/~syrjala/ ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://productguide.itmanagersjournal.com/ -- _______________________________________________ Dri-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/dri-devel
