Le Mon, 01 Jun 2009 10:46:45 -0700 Corbin Simpson <[email protected]> a écrit:
> Patrice Mandin wrote: > > Le Mon, 01 Jun 2009 03:24:39 +0200 > > Roland Scheidegger <[email protected]> a écrit: > > > >> Yes, seems so. In fact if you take a newer spec it'll list > >> BlendEquationSeparate as promoted to core in 2.0. > >> > >>> Ah OK. Then I think I should write some test for renouveau, so I check > >>> what Nvidia do when using these functions on nv30. > >> AFAIK Nvidia did BlendFuncSeparate in software for nv20/25 so I'd guess > >> it could be the same for BlendEquationSeparate for nv30. Though maybe > >> the chip is flexible enough somehow to not require this. > > > > Well, from the simple renouveau test we currently have, a fragment > > program is used on nv30 for this function, so currently no change is > > required in Mesa. However nv30 gallium backend should be modified to > > take this into account. > > If there are other chipsets that cannot do true separate alpha blend, we > can always use PIPE_CAP to let Mesa know, and Mesa can do the fragment > program alteration itself. (r3xx and r4xx also have this, so it might be > useful later on.) I did more tests. I think I was wrong, in fact, when using BlendEquationSeparate functions, no triangle rendering command is sent to the gpu, so I suppose it's all software rendering. The shader program is a single instruction to set current color, plus it resend all tcl engine state. But it's good news if a fragment program can do this instead, so adding the PIPE_CAP should be useful, if other cards need it also. -- Patrice Mandin WWW: http://pmandin.atari.org/ Programmeur Linux, Atari Spécialité: Développement, jeux ------------------------------------------------------------------------------ OpenSolaris 2009.06 is a cutting edge operating system for enterprises looking to deploy the next generation of Solaris that includes the latest innovations from Sun and the OpenSource community. Download a copy and enjoy capabilities such as Networking, Storage and Virtualization. Go to: http://p.sf.net/sfu/opensolaris-get _______________________________________________ Mesa3d-dev mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/mesa3d-dev
