[Wayland-bugs] [Bug 78585] multiple monitor fullscreen images incorrect position/scale

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78585

--- Comment #9 from Ryan Smith <rqsmith at gmail.com> ---
(In reply to comment #8)
> Ok, so the problem here specifically is that it is not centered, right?
The scale also seems off.  The bottom of the image is cut off.

> You are not expecting it to cover both monitors?
No, I am not expecting that.  If it did I would expect it to scale in a way as
to not cut off part of the image.

> What scale do you expect?
Assuming the game is using/outputting a 720p buffer when the resolution switch
is done I would expect the scale to be 2x2.  A useful default behavior would to
be a fixed ratio scale to fit where the image is fit to fill most of one
monitor.  Most games seem to be intended to run on a single monitor.  If that's
not possible then the best thing to do would probably be to place the image
centered on one monitor with no scaling applied.

> The panel becomes visible, when the fullscreen window is no longer active.
> That is expected. Activating the fullscreen window again should make the
> panel go away.
> 
> The other stuff however is unexpected.
Should moving the window containing the representation of the screen cause a
fullscreen mode to exit with the X11 backend?  I did nothing to tell the game
to exit fullscreen mode.

> 
> I suspect this might be partly a problem in SDL2. We'd have to see a Wayland
> protocol dump from the game. It goes to stderr, when you set the environment
> variable WAYLAND_DEBUG=client (only for the game, not weston).
> 
> That dump will probably be quite long, so it will need someone to sit down
> and look at it for a while.
> 
> There is no Xwayland involved, right?

Just running with SDL_VIDEODRIVER=wayland.  xwayland was not loaded in
weston.ini.

It is possible this a bug with libSDL but I wasn't sure who to report it to but
I thank you for taking a look at it.

I am attaching the debug logs you requested.

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