[SDL] SDL_GL_SetAttribute problem.

[Ryan C. Gordon]

> In windows, it doesn't seem to care if I set the colors before or after. On
> Linux the program will crash if I don't set the colors -after- calling
> SDL_SetVideoMode().
> 
> So what's going on here?

It shouldn't crash before SetVideoMode...the function calls are 
meaningless _after_ the video mode is set.

Likely there isn't a GL library loaded. Try SDL_GL_LoadLibrary() before 
the SDL_GL_SetAttribute() calls. SDL_SetVideoMode() with SDL_OPENGL 
forces SDL to load a default GL library if one isn't yet loaded, which 
is why it ceases to crash at that point.

So do this, in this order:
  - SDL_Init
  - SDL_GL_LoadLibrary
  - SDL_GL_SetAttribute
  - SDL_SetVideoMode
  -  (the rest of your program)
  - SDL_Quit

--ryan.