No fractional scaling on Linux (Wayland)

[ShalokShalom]

There is currently no support for fractional scaling.

This issue is to track the development of that.

I am running: Arch KDE, Wayland and Vega 8 (amdgpu and radv)

[ShalokShalom]

No, thats not the same issue. In my instance, the scaling doesnt apply at all, and the mouse cursor (and everything else) is exactly the same.

[brakhane]

Ah, I see. Is this Wayland only or X11 as well?

[ShalokShalom]

I run only Wayland, and usually are fractional scaling issues exclusive to each graphic server, in my experience. 🙂

[PAMinerva]

Temporary fix:
It should work if you force it to run through XWayland by exporting SDL_VIDEODRIVER=x11 before launching the editor.

export SDL_VIDEODRIVER=x11
./path/to/WickedEngineEditor

[PAMinerva]

Anyway, the root of the problem seems to be SDL2.
If you want to test it yourself, try cloning WickedEngine, switch to the SDL3 branch, rebase it onto master, and resolve the conflicts.
Fractional scaling works as expected on Wayland (just tested on both arch and fedora).

Maybe it’s time to consider fully porting the engine to SDL3 — it seems like a more future-proof choice at this point.
SDL3 will also be officially available on Ubuntu starting April 17th, with the release of version 25.04.