Sometimes it's down to practicality - and may depend on the window manager. Mouse and keyboard grabs are there to redirect keyboard input to a game (this being somewhat useful). The mouse in particular will likely require a relative motion mode within the game to avoid limits on mouse motion.
I'm not sure how it goes these days, but the option of running in a windowed "fullscreen" mode may carry performance penalties that make it an undesirable approach. And I won't even get started on cross-platform problems with that too.
An in-game option or key combo to switch to windowed mode and release mouse/keyboard might be a better option.



Reply With Quote
, but fullscreen or windowed shouldn't make much of a difference in performance.
