[PATCH 1/3] RFC: drm: Restrict vblank ioctl to master

[Rainer Hochecker]

Thanks a lot.
Would you know if/when Wayland will support OpenGL?

Rainer

On Mon, Jun 20, 2016 at 4:46 PM, Daniel Stone <daniel at fooishbar.org> wrote:

> Hi Rainer,
>
> On 17 June 2016 at 22:00, Rainer Hochecker <fernetmenta at kodi.tv> wrote:
> > I agree. GLX_OML_sync_control fulfils all our requirements apart from
> being
> > available for EGL. It would be great to have it available for EGL. In
> regard
> > to Wayland this is really important. For the time being Kodi stopped
> > supporting Wayland because a/v sync is not possible on that platform.
>
> This isn't true. For Wayland, you can use the wp_presentation_time
> extension:
>
> https://cgit.freedesktop.org/wayland/wayland-protocols/tree/stable/presentation-time/presentation-time.xml
>
> If you're using the zwp_linux_dmabuf extension directly, then you can
> easily and obviously use the extension to get feedback, and there are
> examples of using this. But even if you're using EGL, Wayland's EGL
> client platform has the property that a wl_surface::commit request
> must be issued from inside eglSwapBuffers. So you can make use of this
> to issue a presentation_time feedback request immediately before
> calling eglSwapBuffers, which will return a unique event giving you
> the exact time that the buffer swap was actually displayed on screen.
> This is far better than vblank requests which only give you hardware
> clock ticks, and tell you nothing about actual display time.
>
> I do discuss this with Peter occasionally, but please get in touch if
> you feel there is anything else missing, because we have gone to great
> lengths to make Wayland as good as it possibly can be for exactly
> these usecases.
>
> Cheers,
> Daniel
>
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