[SDL] How to dynamically check for SDL_GL_SWAP_INTERVAL support

[atrix2 at cox.net]

even though you are dynamically linking to the sdl lib, you still "statically link" to sdl.h and other sdl related headers which is where the enum is actually defined.

---- Stephen Anthony <sa666666 at gmail.com> wrote: 
> Hi, I'm wondering how to check (at runtime) if I can use the GL command:
> 
>     SDL_GL_SetAttribute( SDL_GL_SWAP_CONTROL, 1 );
> 
> This only works on SDL > 1.2.10, I think.  The problem is, how do I 
> check this at runtime, since the SDL lib will be dynamically linked?  
> And just because it's available at compile-time doesn't mean it will be 
> at run-time (and vice-versa).
> 
> Basically, I need to determine at run-time if the 
> enum 'SDL_GL_SWAP_CONTROL' is actually defined.  Does anyone have any 
> advice?  I know I could just define that variable to whatever SDL 
> 1.2.10 uses and just always call the function, but that seems a hacky 
> way of doing things.
> 
> Thanks for any info,
> Steve
> 
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