When i Will Start Warzone 2100 (in German) than have`s a Error that Called: (from stderr.txt.)
error: Error: SDL_SetVideoMode failed (Unable to create GL context).
Windows or Linux? Which version of Warzone? Which drivers do you have installed? Do other GL games work?
Linux:
What type of drivers do you have installed? Binary (nvidia) or FOSS (nv)?
Does glxgears work? What's the output of glxinfo?
In anycase even if he doesn't have drivers with an OpenGL implementation. Then the software implementation provided on Windows systems should kick in (not sure if Vista provides any such thing though, XP and before do though).
"First make sure it works good, only then make it look good." -- Giel
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If it is that WGLGears which I posted above that fails to function then your OpenGL drivers most likely don't work. That program is meant to test your OpenGL implementation/drivers.
The reason that other OpenGL games work may be that those other games use OpenGL as well as DirectX (yes these games actually do exist). It probably falls back to DX if that's the case.
"First make sure it works good, only then make it look good." -- Giel
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I receive a similar error message with a fully configured gentoo linux system (x86) running 2.6.22-r8 along with xorg-server 1.4 and latest 100-series nvidia-drivers (GeForce FX Go5600). GLXgears runs fine and Xorg.log shows that GLX is configured properly.
$ warzone2100
error: Error: SDL_SetVideoMode failed (X11 driver not configured with OpenGL).
(the binary was compiled with gcc 4.2.1 and binutils 2.18)