I'm a complete noob to FlightGear, so my apology in advance if this is
an FAQ, but I did make a reasonable attempt at searching for this as a
known issue.
When running the opengl (glut) version of fgfs on linux, if I use the
--enable-game-mode option, it sets the display correctly and all works
beautifully. However, once I leave fgfs, the screen resolution stays
set to whatever I specified on the fgfs command line instead of
reverting to the original desktop size.
I couldn't find a solution to this, but after quite a bit of searching,
I found that fgfs tells glut to enter 'game mode' on initialisation, but
never tells it to leave. Not sure if this perhaps happens automatically
on exit with the Windows glut libraries, but it doesn't seem to with the
freeglut build I am using. (freeglut 2.4.0 on Fedora 10)
So, I added an atexit() callback for glutLeaveGameMode() and now it
correctly reverts to the original screen resolution when I exit.
diff -c fg_os.cxx fg_os-patch.cxx
*** fg_os.cxx 2008-12-14 17:02:22.738051861 +1100
--- fg_os-patch.cxx 2008-12-14 17:20:30.222473945 +1100
***************
*** 233,238 ****
--- 233,239 ----
}
glutGameModeString( game_mode_str );
glutEnterGameMode();
+ atexit(glutLeaveGameMode);
}
// Register these here. Calling them before the window is open
I would have preferred not to add another exit callback, but there
didn't seem to be anywhere else sensible for it. fgOSExit() seemed like
the logical place, but that doesn't seem to be always (ever?) called on
exit.
Anyway, I'm now running happily with my patched fgfs. Just thought I
would mail this to the list in case it is generally useful. (or perhaps
someone can tell me why it is a bad idea)
Thanks,
Peter.
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