Keith Whitwell pisze: > On Fri, 2009-10-30 at 11:24 -0700, michal wrote: > >> +/* >> + * Currently, the following constraints apply. >> + * >> + * - PredSwizzleXYZW is either set to identity or replicate. >> + * - PredSrcIndex is 0. >> + */ >> > > Michal, > > This is looking a lot better. In terms of the above comment, is this > talking about the semantics of PIPE_CAP_GPU3 ? Or is GPU3 supposed to > do full PredSwizzle/PredSrcIndex, just we haven't implemented it > somewhere (eg in tgsi_exec.c)? > > I'd think we want to either: > - remove fields from the token so that the comment isn't necessary, > - remove the comment and have GPU3 mean that the full semantics are > available > - come up with yet another cap bit to say whether or not full predicate > semantics are implemented by a particular driver. > > Needless to say I don't like the last option, so I guess that means we > need to decide now whether the full semantics in the token are in or > out. > > How does SM3 fall on these issues? > > > The SM3 specification explicitly states that the predicate swizzle needs to be either .xyzw or component replicate. The GL_MESA_gpu_program3 spec allows arbitrary swizzles (there's nothing in the document that would say otherwise).
I say, rename PIPE_CAP_GPU3 to PIPE_CAP_SM3 to indicate predicates are supported with the mentioned swizzle constraints. When the dust settles on gpu_program3 spec, the state tracker will compensate for the lack of arbitrary swizzles if needed. Also, add PIPE_CAP_MAX_PREDICATES to query the number of predicate registers supported by the driver. That will allow us to remove the `PredSrcIndex is 0' constraint. ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ Mesa3d-dev mailing list Mesa3d-dev@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mesa3d-dev
