r_swapinterval normally syncs display refresh and screen update. This requires 2 lines of code to be added to the mac version. I quickly patched it myself, but now the mouse lags when it's enabled unless I set my com_maxfps to 58 to keep the fps below 60 (on a 60Hz imac screen).

I really would like r_swapinterval to behave like normal considering 60Hz shows a lot of tearing without it and the mac doesn't have a force vsync like my xp drivers. the 58 fps fix shouldn't be needed either cause it makes the game appear somewhat jerky too (missing the 2 updates each second I guess).

Noticed it would be fixed with new sdl version, but my main concern is the mouse lag which also appears on id's sourcecode (where r_swapinterval works as it should)