Re: Qustion: Support for Splitting Application Output Across Multiple Displays in Weston

[Alan Griffiths]

On 29/03/2024 01:20, Yosuke Nakayama wrote:

Dear Wayland-devel Community,

I am currently exploring the capabilities of Weston, the reference 
compositor for Wayland, specifically in the context of an application 
use case that I am working on. My goal is to achieve a functionality 
where the graphical output of a single application can be divided and 
displayed simultaneously across two separate displays. This 
functionality would enable part of the application window to be shown 
on one display and the rest on another, effectively spanning the 
application window across multiple screens.


From my understanding and current experimentation with Weston, this 
particular use case does not seem to be directly supported, but I'm 
not sure. Does functionality exist at this time to achieve such a use 
case?


I don't think this is currently supported by Weston. But it is supported 
by Ubuntu Frame 
. 
Does you usecase allow you to consider alternative compositors?




Thank you for your time and assistance!

Best regards,



--
Canonical-20th-anniversary

Alan Griffiths

Senior Engineer (Mir)

Location:



United Kingdom

canonical.com



ubuntu.com

Re: Qustion: Support for Splitting Application Output Across Multiple Displays in Weston

[Marius Vlad]

On Fri, Mar 29, 2024 at 06:46:04PM +0900, Yosuke Nakayama wrote:
> Thanks for the quick response.
> 
> > With a (new) shell, or maybe with additions to desktop-shell, it would
> allow the following to create a virtual output:
> Does this mean that the existing shells (xdg-shell, kiosk-shell, ivi-shell,
> etc.) cannot achieve the functionality?
No, not in the sanse I've described earlier (using the
maximized,fullscreen requests).

With desktop-shell, you can create a region that spans all the
outputs, but not with kiosk-shell. I don't know about ivi-shell, but
with ivi-shell you can have other controllers which can problably achieve 
that, but similarly to the new shell, you might have to write it. Might want
to take a look at the wayland-ivi-extension see if it that has something
like that.
> 
> On Fri, Mar 29, 2024 at 5:45 PM Marius Vlad 
> wrote:
> 
> > On Fri, Mar 29, 2024 at 10:20:50AM +0900, Yosuke Nakayama wrote:
> > > Dear Wayland-devel Community,
> > Hi,
> > >
> > > I am currently exploring the capabilities of Weston, the reference
> > > compositor for Wayland, specifically in the context of an application use
> > > case that I am working on. My goal is to achieve a functionality where
> > the
> > > graphical output of a single application can be divided and displayed
> > > simultaneously across two separate displays. This functionality would
> > > enable part of the application window to be shown on one display and the
> > > rest on another, effectively spanning the application window across
> > > multiple screens.
> > >
> > > From my understanding and current experimentation with Weston, this
> > > particular use case does not seem to be directly supported, but I'm not
> > > sure. Does functionality exist at this time to achieve such a use case?
> > In desktop-shell, maximized and fullscreen xdg-shell calls for a
> > particular will *not* span across multiple outputs, nor there's a way to
> > define a virtual output that will add up multiple physical outputs into
> > a virtual one. For kiosk-shell, windows will be fullscreen'ed to a
> > particular output. That doesn't mean this can't be done. With a (new)
> > shell, or maybe with additions to desktop-shell, it would allow the
> > following to create a virtual output:
> >
> > [virtual-output]
> > output=eDP-1,HDMI-A-1
> > name=MyVirtualOutput-1
> >
> > Then, the compositor will advertise this output as well such that the
> > client can issue a maximized, fullscreen request and have client spanned
> > across those outputs.
> >
> > >
> > > Thank you for your time and assistance!
> > >
> > > Best regards,
> >


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Re: Qustion: Support for Splitting Application Output Across Multiple Displays in Weston

[Marius Vlad]

On Fri, Mar 29, 2024 at 10:20:50AM +0900, Yosuke Nakayama wrote:
> Dear Wayland-devel Community,
Hi,
> 
> I am currently exploring the capabilities of Weston, the reference
> compositor for Wayland, specifically in the context of an application use
> case that I am working on. My goal is to achieve a functionality where the
> graphical output of a single application can be divided and displayed
> simultaneously across two separate displays. This functionality would
> enable part of the application window to be shown on one display and the
> rest on another, effectively spanning the application window across
> multiple screens.
> 
> From my understanding and current experimentation with Weston, this
> particular use case does not seem to be directly supported, but I'm not
> sure. Does functionality exist at this time to achieve such a use case?
In desktop-shell, maximized and fullscreen xdg-shell calls for a
particular will *not* span across multiple outputs, nor there's a way to
define a virtual output that will add up multiple physical outputs into
a virtual one. For kiosk-shell, windows will be fullscreen'ed to a
particular output. That doesn't mean this can't be done. With a (new)
shell, or maybe with additions to desktop-shell, it would allow the
following to create a virtual output:

[virtual-output]
output=eDP-1,HDMI-A-1
name=MyVirtualOutput-1

Then, the compositor will advertise this output as well such that the
client can issue a maximized, fullscreen request and have client spanned
across those outputs.

> 
> Thank you for your time and assistance!
> 
> Best regards,


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Qustion: Support for Splitting Application Output Across Multiple Displays in Weston

[Yosuke Nakayama]

Dear Wayland-devel Community,

I am currently exploring the capabilities of Weston, the reference
compositor for Wayland, specifically in the context of an application use
case that I am working on. My goal is to achieve a functionality where the
graphical output of a single application can be divided and displayed
simultaneously across two separate displays. This functionality would
enable part of the application window to be shown on one display and the
rest on another, effectively spanning the application window across
multiple screens.

>From my understanding and current experimentation with Weston, this
particular use case does not seem to be directly supported, but I'm not
sure. Does functionality exist at this time to achieve such a use case?

Thank you for your time and assistance!

Best regards,