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Hello,

I am trying to implement display selection for fullscreen in the
Wayland, as an alternative implementation of bug 2803[0] based on the
patch I provided in bug 2913[1], but it seems there is no way for the
application to tell SDL it doesn’t care about which display to use for
fullscreen.

This issue stems from the definition of SDL_WINDOWPOS_CENTERED, as
follow (SDL2/SDL_video.h, line 129):
#define SDL_WINDOWPOS_CENTERED SDL_WINDOWPOS_CENTERED_DISPLAY(0)

What would be the best way to solve this issue? I was thinking about
changing the definition of SDL_WINDOWPOS_CENTERED to something like
SDL_WINDOWPOS_CENTERED_DISPLAY(SDL_DISPLAY_DONTCARE), with
SDL_DISPLAY_DONTCARE defined as some currently invalid display, what do
you think about that? It wouldn’t fix already-compiled programs, but
any future one using SDL_WINDOWPOS_CENTERED would let the compositor
select which display to use.

[0] https://bugzilla.libsdl.org/show_bug.cgi?id=2803
[1] https://bugzilla.libsdl.org/show_bug.cgi?id=2913

--
Emmanuel Gil Peyrot

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