[RFC] DRI2 synchronization and swap bits
eric at anholt.net
Fri Oct 30 11:42:06 PDT 2009
On Fri, 2009-10-30 at 10:59 -0700, Jesse Barnes wrote:
> I've put up some trees (after learning my lesson about working in the
> main tree) with the latest DRI2 sync/swap bits:
> git://git.freedesktop.org/home/jbarnes/xserver master branch
> git://git.freedesktop.org/home/jbarnes/mesa master branch
> They includes support for some new DRI2 requests (proto for which is in
> the dri2-swapbuffers branch of dri2proto), including:
> These allow us to support GLX extensions like SGI_video_sync,
> OML_swap_control and SGI_swap_interval.
> There have been a few comments about the protocol so far:
> 1) DRI2SwapBuffers
> a) Concern about doing another round trip to fetch new buffers
> following the swap.
> I think this is a valid concern, we could potentially respond
> from the swap with the new buffers, but this would make some
> memory saving optimizations more difficult (e.g. freeing
> buffers if no drawing comes in for a short time after the swap).
You're doing one round-trip anyway, and if users are concerned about the
second one, go use XCB already. (We need to go fix Mesa to do that).
eric at anholt.net eric.anholt at intel.com
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