[SDL] Where have all my textures gone?

[Curtis Cooper]

Hi,

Firstly, sorry if this is an old topic; I joined the list this 
morning, so I'm way behind.

I'm working on an OpenGL/SDL game which employs texture mapping heavily.  
I'm getting weird behavior under Windows using VC++ 6 that I'm not seeing 
in Linux.

In my game loop, I have a key, 'f', which sets the screen resolution to
800x600 pixels using whatever color depth SDL originally chose from the
startup resolution of 1024x768.  The function called is just 
SDL_SetVideoMode.  

In Linux, this works perfectly.  My OpenGL scene gets redrawn perfectly at 
the new resolution, with all the textures intact, etc.  The scene just looks 
like a smaller version of the original.  On the other hand, with the 
exact same source code compiled with VC++ 6 on Windows 2000, however, the 
behavior of the 'f' key is quite different.  It causes my OpenGL scene to 
be resized to the lower resolution all right, but now all the textures 
for the polygons in the scene are gone!  Is this a glitch in the SDL 
implementation for MS Windows, or have I made a subtle memory-related SDL 
programming error?  

Finally, I have noticed a similar glitch in the Linux implementation of 
SDL when switching resolutions in fullscreen mode.  When the program 
quits, SDL_Quit() does not reset the XFree86 resolution to what it was 
before the SDL app changed it, so that my XFree86 server ends up in a 
different video mode than it started with as an after-effect of the 
program.  The alteration of X, of course, only happens if I elect to 
run the game in fullscreen mode, since windowed won't affect the 
screen resolution itself.  In any case, this is highly undesirable 
behavior.  How have people worked around this?  

For both issues, not that I have installed the most recent (Aug 1) CVS 
version of the SDL libraries and headers.

Thanks,
Curtis