Fullscreen should support widescreen HD displays.

[harp37]

Even 720p would be great.

[vwbusguy]

It's hard coded in https://github.com/mattdm/icebreaker/blob/release/icebreaker.h#L147. I'm not sure how much the aspect ratio matters, but it's possibly to fetch available display modes. The difficulty is that windows and Linux have different display servers, and Linux two (which can still be determined through $XDG_SESSION_TYPE.). One thing you might try is overriding those two definitions with a 720p 16:9 aspect ratio (or the closest your monitor supports), compiling it, and seeing if it displays correctly. If so, then it should be a matter of being able to read what the display supports and giving the user and option to override those values.

[vwbusguy]

It may actually be easier than I thought. Since it's using sdl2, it may be possible to simply use sdl2 to read the current display resolution was a basis for full screen resolution. That should be tested on HIDPI displays, though.

Ref. https://wiki.libsdl.org/SDL_GetDesktopDisplayMode

[mattdm]

It is using SDL 1, alas. SDL 2 wasn't released for another decade. Porting it to SDL 2 should probably be task number 1.