https://bugs.kde.org/show_bug.cgi?id=508822
Bug ID: 508822
Summary: SDL_WarpMouseInWindow breaks V-SYNC under Wayland/kwin
Classification: Plasma
Product: kwin
Version First unspecified
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 184506
--> https://bugs.kde.org/attachment.cgi?id=184506&action=edit
testing app
SUMMARY
If SDL_WarpMouseInWindow is used in combination with SDLGPU3 and Wayland/kwin,
V-SYNC is not respected.
Initially I reported this in SDL's bug tracker
https://github.com/libsdl-org/SDL/issues/13812 but it does not seem to be a SDL
bug, since it cannot be reproduced in other DE's. Also v-sync works fine with
X11.
STEPS TO REPRODUCE
1. compile the attached file "g++ vsync-test.cpp -o vsync-test -lSDL3"
2. Run the executable
3. comment-out the "SDL_WarpMouseInWindow(window, 0, 0);" line and recompile
4. Run the executable again
OBSERVED RESULT
With SDL_WarpMouseInWindow, v-sync is disabled. The executable prints: Frame
time: 0
EXPECTED RESULT
In both cases v-sync should be enabled.
SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 42
KDE Plasma Version: 6.4.4
KDE Frameworks Version: 6.17.0
Qt Version: 6.9.1
ADDITIONAL INFORMATION
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