On Tue, 26 Feb 2019 00:11:45 +1300 Scott Anderson <scott.ander...@collabora.com> wrote:
> On 25/02/19 8:21 pm, AMAR SEN wrote: > > Hi, > > > > 1. Is there any client side functionality to handle multiple displays? > > It can be seen as like a particular client has some options that can > > direct the server to show frames on either of the displays or both > > (multiple displays) of them at the same time. If it has such > > functionality, can somebody point me to an example implementation of > > such client? > > A normal Wayland client has no control regarding how it is placed by the > compositor, which is an intentional design decision. > The most control I can think of (which may fit your use case), is that a > client can ask to be placed fullscreen on a particular output using the > fullscreen-shell protocol Hi, that is almost true, I just want to clarify a certain difference. For desktop systems, the shell protocol extension used (wl_shell, xdg_wm_base, ...) may offer a method of fullscreening to a specific output. Aside from fullscreening, clients usually cannot affect where they will positioned, by design. Proper positioning is the compositor's responsibility. Fullscreen shell extension is another beast completely, and mutually exclusive to the desktop shell extensions. The fullscreen shell is intended for a single client to take over all outputs, and does not support multiple simultaneous clients. It also requires explicit support from clients, and application toolkits usually do not have that. > > 2. As I have read at multiple places that weston supports multi-display > > for drm based devices, is it also possible for fbdev backend, or it has > > some functionality constraint that do not let that to work on fbdev? > > I _think_ the fbdev backend does support multiple outputs. I've never > actually used the fbdev backend before, but the code implies that it > does. Either way, I would strongly recommend that you use the DRM > backend instead. Right, please do not even consider using the fbdev backend for any new projects. The only reason it has not been deleted yet is because there may still be few lingering users. fbdev is in all ways inferior to the DRM backend: https://lists.freedesktop.org/archives/wayland-devel/2019-January/039877.html Let fbdev die in peace, it has been almost dead for so many years by now. > > > 3. I am actually using weston-3.0.0 version for my project, does it have > > multi-display support for any backend? If yes, can someone please help > > me find the commit to the wayland weston project which brought in the > > multi-display support? > > Just to be absolutely sure, are you just referring to having multiple > computer monitors ("heads") connected? I believe weston has always had > support for that. > Later versions of weston are capable of cloning a monitor's contents > efficiently across multiple monitors, which may potentially be useful > for you. Yes, Weston supports multiple outputs on the same graphics card. Support for using multiple graphics cards is not there yet. Thanks, pq
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