sdl:video-dimensions returns NIL if no window exists

[robotjunkyard]

Lispbuilder's documentation states that, if SDL:WINDOW has not yet been called, then SDL:VIDEO-DIMENSIONS returns "the best video dimensions" (presumably this means the native desktop resolution, which is the intent). However it returns NIL if this is the case:

      (sdl:with-init ()
	(let ((best-res (sdl:video-dimensions)))
	  (format t "best-res = ~a~%" best-res)
	  (setq *monitor-res-x* (aref best-res 0)
		*monitor-res-y* (aref best-res 1)))
         [et cetera...]

And of course it crashes on aref because best-res was returned as NIL.

It does returns a 2-element vector just fine if a WINDOW was already made, but in this instance I want it to memorize the native desktop resolution before my program makes any windows.

[Balooga]

For some reason SDL_GetVideoInfo is returning a null pointer, which is why (sdl:video-dimensions) returns nil. I need to do some digging to find out why SDL is suddenly behaving like this. I know for sure this used to work.