Re:?==?utf-8?q? [PATCH wayland-protocols v7] Add zwp_linux_explicit_synchronization_v1

[Alexandros Frantzis]

On Monday, December 17, 2018 12:44 GMT, Tomek Bury <tomek.bury at gmail.com> wrote: 
> On Wed, 28 Nov 2018 at 14:35, Tomek Bury <tomek.bury at gmail.com> wrote:
> > Hi Pekka,
> >
> > > I suppose the compositor-side copy of buffers you mentioned is for the
> > > lack of release fences, not acquire fences?
> > Yes, the lack of release fences is the very reason for the copy. I could
> > cook something up for the acquire fence, but that wouldn't synchronise the
> > buffer access anyway. The only way I can be sure the client doesn't
> > overwrite a buffer still in use by the GPU was to texture from a copy and
> > let the compositor release the original without waiting for the GPU and
> > without a fence.
> >
> > Cheers,
> > Tomek
> >
> Hi Pekka, Alexandros,
> 
> Here's a patch containing all I had to do in order to test the explicit
> sync support Alexandros has implemented in Weston.
> 
> Thanks,
> Tomek

Hi Tomek,

I have now updated the weston explicit-sync gitlab MR [1] to support,
among other things, minor version 2 of the protocol. Instead of
completely removing the checks, I have updated them to check for and
accept all non-SHM buffers, which is adequate for current needs. There
are other ways to deal with these checks if we think we need a more
versatile approach (e.g., asking the renderer to tell us if it support fences
for a particular buffer). Please see the MR comments for more info and
discussion.

Thanks,
Alexandros
 
[1] https://gitlab.freedesktop.org/wayland/weston/merge_requests/32