Re: [Mesa3d-dev] [RFC] Event-based buffer validation for DRI2.

[Kristian H. <kr...@bi...>]

On Sat, Jan 16, 2010 at 4:58 PM, Francisco Jerez <cur...@ri...> wrote:
> The current buffer validation approach (AKA the DRI2 glViewport hack)
> is both incorrect (because a compliant OpenGL application may opt for
> the identity as viewport transform and work with window coordinates
> directly) and inefficient (some programs have the habit of calling
> glViewport several times per frame (e.g. OpenArena), causing many
> unnecessary roundtrips).
>
> This changeset gives DRI2 the ability to report drawable changes in an
> asynchronous way, but it's a bit intrusive so I expect all sorts of
> complaints to come.

No, it sounds good, I'm happy that you're looking into this.  I'll
have a closer look tomorrow, but what I've had in mind for this kind
of thing was that we could just allocate the new buffers up front in
the X server.  Then, instead of an invalidate event and a subsequent
DRI2GetBuffers, we'll just have a "here are your new buffers event",
so we avoid the round trip.

Thanks,
Kristian