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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