Hi pekka Thank you for your clearly analysis. I understand the presentation protocol is enough for the requirement now.
I used to not study the protocol deeply because the code is a little more than just record the flip timestamp. The test want to do this as simple as possible. I will try the presentation first. Thank you! Best Regards Nancy 2018-05-02 16:59 GMT+08:00 Pekka Paalanen <ppaala...@gmail.com>: > On Wed, 2 May 2018 16:33:43 +0800 > zou lan <nancy.lan....@gmail.com> wrote: > > > Add to wayland mail list. > > > > Hi pekka > > > > I used to consider the time line and presentation protocol. But they are > > all focus on surface, not buffer. The test want to know the buffer > latency, > > although they are the same as surface's on > > most cases. Applications think maybe some buffers doesn't display and > used > > again. > > > > By the way, could add a event to wl_buffer's protocol achieve the > > requirement? Thank you. > > Hi Nancy, > > when a client creates a wp_presentation_feedback object, that object > tracks the particular wl_surface.commit carrying an attached wl_buffer. > So it is specific to the particular commit, not just to the surface > or even to the buffer (buffers get re-used or could theoretically be > used on multiple surfaces). > > Can you not have the client record both the current time at sending > wl_surface.commit and the corresponding timestamp it gets from > wp_presentation_feedback? Why would this not be enough? > > Please, see clients/presentation-shm.c in the Weston repository for an > example that tracks this kind of presentation latencies. > > > Thanks, > pq > > > ---------- Forwarded message ---------- > > From: Pekka Paalanen <ppaala...@gmail.com> > > Date: 2018-05-02 15:48 GMT+08:00 > > Subject: Re: unique id for wayland objects > > To: zou lan <nancy.lan....@gmail.com> > > > > > > On Wed, 2 May 2018 10:57:17 +0800 > > zou lan <nancy.lan....@gmail.com> wrote: > > > > > Hi pekka > > > > > > I want to get the accurate buffer latency from a buffer commit by > client > > to > > > display on the screen. The client can get the timestamp when buffer > commit > > > and release. So weston only need to give a > > > timestamp when call on_pageflip. > > > > > > When do the real time analysis, there are many clients, I want to use > one > > > unique id to distinguish from each other quickly. > > > > Hi, > > > > is there any reason you don't use presentation_feedback interface? To > > me it sounds like that would provide exactly what you need. > > > > https://cgit.freedesktop.org/wayland/wayland-protocols/ > > tree/stable/presentation-time > > > > Also, could we have this coversation on the mailing list, please? > > > > > > Thanks, > > pq > >
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