You can't at leat not by BlitzMax.
However, there is SOME CHANCE that if your system has software-only OpenGL it MIGHT be that there isn't enough video ram for fullscreen mode. You could try opening a full-screen display and if it fails this *might* indicate that full-screen is not supported, and hence there is no hardware acceleration. But that's very dubious.
However, there is SOME CHANCE that if your system has software-only OpenGL it MIGHT be that there isn't enough video ram for fullscreen mode. You could try opening a full-screen display and if it fails this *might* indicate that full-screen is not supported, and hence there is no hardware acceleration. But that's very dubious.