Running the game.
You might want to run it like this from XQF: glqwcl.glx -width 1280 -height 1024 (or any other resolution your system can support)
XQF is a nice program to find QuakeWorld servers and can be found at: http://www.linuxgames.com/xqf
To run the game fullscreen requires starting the game at the same resolution as your X desktop. If you are running a desktop environment, you might not be able to hide everything. The sure way to get a fullscreen experience is to run XFree86 on its own without any desktop environment or window manager loaded:
This starts X without any desktop environment or window manager. /etc/X11/xinit/xinitrc normally starts your desktop.
Switches to the resolution you want. Check your /etc/X11/XF86Config if you don't have any other resolutions available.
Switches back to the text console.
All X applications accept a -display command line argument to tell it which X server to display on. Every X program is an X server client. 0.0 represents the screen on F7, 1.0 on F8, etc. localhost is your computer. Its possible and very common to execute an X program on one computer but have it display on some other workstation. localhost could be an IP address or the dns name of any computer running X that is accepting connections from where you run the X client application program.
Switches back to X 0.0. Using xterm, start XQF or whatever program you use to launch Quake.
Tell your quake launcher to start it like this, where w and h are the resolution you are at. A good resolution is 1024 by 768.
At the console, you can try turning on and off the flashblend function and see which lighting effects you prefer:
gl_flashblend 0 gl_flashblend 1
When it is on (1), you may notice colored light effects around flags and special items. In this mode, you may NOT see flashes from weapons and light on the walls from rockets. The exact effects of toggling flashblend may depend on your specific OpenGL installation.
When it is off (0), there may not be any COLORED light, but otherwise all light effects work. Flags and special items have a glow around them and light up surrounding surfaces. Weapons flash when fired and rockets light up everything around them as they travel.