On Wednesday, March 25, 2015, Dave Airlie <airlied@xxxxxxxxx> wrote:
On 25 March 2015 at 08:50, Daniel Stone <daniel@xxxxxxxxxxxxx> wrote:
> I'm not going to lie, I was really hoping the 5th (?) GPU option for
> Qemu would support pageflipping. Daniel's comment about conversion to
> atomic is relevant, but: do you have a mechanism which allows you to
> post updates (e.g. 'start displaying this buffer now please') that
> allows you to get events back when they have actually been displayed?
Page flip is implemented in a later patch,
https://www.kraxel.org/cgit/linux/commit/?h=virtio-gpu&id=1e167e8e964f8e08100d315dd354cc0a4b090841
Since its a long way from an actual display, finding out when
something is actually displayed is hard,
but when we've posted it to the frontbuffer should be fine.
Oh nice. 100% exact timings aren't critical; it's more just having something to gate to 60fps that we can actually drive Weston's repaint loop off, as that's (not unreasonably) driven by pageflip events.
Cheers,
Daniel
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