SDL3 Linux Wayland - SDL_SetWindowFullscreen incorrect size

[BurkeyCode]

SDL3 Linux Wayland - SDL_SetWindowFullscreen incorrect size

[Kontrabant]

Thanks! So, the relevant bits are here:

[1653593.718]  -> [email protected]_min_size(0, 0)
[1653593.720]  -> [email protected]_max_size(0, 0)
[1653593.723]  -> [email protected]_window_geometry(0, -24, 1280, 744)
[1653593.726]  -> [email protected]()
[1653593.729]  -> [email protected]_fullscreen(wl_output@6)
<some irrelevant lines removed>
[1653595.846] [email protected](1280, 744, array[8])

SDL is clearing the constraints, committing to apply the new values, and issuing the fullscreen request, but the compositor is replying with the old size of the window as the fullscreen window dimensions (the extra 24 pixels are where the title bar used to be). SDL is obeying the size that it is given, as the spec states that the supplied fullscreen dimensions are a maximum and clients must be that size or smaller.

SDL seems to be doing everything right here and this doesn't happen on upstream GNOME, so I'm inclined to say that this is a bug in Unity's Mutter fork, especially given the sporadic reproduction nature that you mentioned.

[Kontrabant]

Can you run it with the envvar WAYLAND_DEBUG=1 and attach the output in a case where it is broken? The size constraints are forcibly removed when entering fullscreen, so something is strange here.

[BurkeyCode]

Hi! Thanks for the reply.. I did have a peek into the wayland code and saw it removes that constraint so yeah could be barking up the wrong tree there..

I have attached a log here, cleaned out some of my games log data so hopefully is ok but I also left in the output when I toggle screen size changes so you can search to INFO: Entering fullscreen to see were I toggle fullscreen since there is a lot dumped from wayland there.

error.txt

[BurkeyCode]

Nice, thanks for the feedback, of course title bar for the xtra 24px.

Well, probably not really anything to do on SDL3 as whatever would be need ed would be a bit of a workaround.. I just removed the constraint for resizing from my game for now and fixed some of my own calcs which seems to be ok. I also tried creating the window as sizeable then setting the constraint later - same behaviour.

Cheers for digging into it, much appreciated!