[SDL] Where have all my textures gone?

[Darrell Walisser]

On Sunday, August 4, 2002, at 02:44 PM, Curtis Cooper wrote:

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

Tried searching the list archives?

>
> 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 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?
>

The Windows code for SDL is likely destroying and recreating the OpenGL 
context when you switch resolutions. You should release all of your 
textures before calling SDL_Quit(), then reload them after calling 
SDL_SetVideoMode(). You should also save/restore any other OpenGL state 
you had before, like the viewing transformation etc.