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Bug 3948 - [patch] Wayland: SDL applications start in XWayland by default
Summary: [patch] Wayland: SDL applications start in XWayland by default
Status: NEW
Alias: None
Product: SDL
Classification: Unclassified
Component: video (show other bugs)
Version: 2.0.10
Hardware: x86_64 Linux
: P2 normal
Assignee: Ryan C. Gordon
QA Contact: Sam Lantinga
URL:
Keywords:
Depends on: 4845
Blocks:
  Show dependency tree / graph
 
Reported: 2017-11-07 21:42 UTC by Andrey Alexeyev
Modified: 2019-10-23 18:09 UTC (History)
3 users (show)

See Also:

Attachments
prefer-wayland-over-x11.patch (814 bytes, patch)
2019-10-23 14:14 UTC, David Heidelberg (okias) 		Details | Diff
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Description Andrey Alexeyev 2017-11-07 21:42:34 UTC 
This is because SDL prefers the X11 driver. If XWayland is running on the default display, SDL will happily settle for it, even if the Wayland driver could be used instead.

This is far from ideal. I've experienced subpar performance and visual artifacts, both specific to XWayland, in my OpenGL game.

Applications can work around this by attempting to initialize video with the Wayland driver explicitly first.

This issue probably applies to every other video system where an X11 compatibility layer could be present, e.g. Mir, though I haven't tested that.

Simply moving X11 lower on the priority list should fix this.
Comment 1 David Heidelberg (okias) 2019-10-23 14:07:49 UTC 
I believe this patch [1] solves this issue. It's took from new linux Librem 5 phone gitlab [2].

Since two years passed and Wayland became preferred solution in Linux world, would make sense to prefer it over X11 backend?

[1] https://source.puri.sm/Librem5/libsdl2/raw/997f974c1d0a3acb869cee956c06ba33480f5e58/debian/patches/prefer-wayland-over-x11.patch
[2] https://source.puri.sm/Librem5/libsdl2/commit/997f974c1d0a3acb869cee956c06ba33480f5e58
Comment 2 David Heidelberg (okias) 2019-10-23 14:14:00 UTC 
Created attachment 4017 [details]
prefer-wayland-over-x11.patch
Comment 3 Ryan C. Gordon 2019-10-23 16:49:05 UTC 
(In reply to David Heidelberg (okias) from comment #1)
> Since two years passed and Wayland became preferred solution in Linux world,
> would make sense to prefer it over X11 backend?

SDL's wayland target needs client-side decorations in some form, at a minimum, before it can be favored over X11.

This is definitely not going to happen for 2.0.12.

--ryan.