REPOST : Does SDL Load OpenGL library twice

SDL Development
1

Hi All,
Someone on the JEDI-SDL mailing list posted the following question,
and as I am not familiar with SDL’s internals I said I would refer it to
this newsgroup…

Does SDL Load the OpenGL library twice.

ie:

  • SDL.dll loads and binds itself to OpenGL12.dll
  • SDL.dll performs the initializations
  • OpenGL12.pas loads and binds itself to OpenGL12.dll
  • program uses bindings in OpenGL12.pas

The “OpenGL12.dll” will be the same DLL, and Windows
won’t load it twice, but if hardware acceleration is used, the
real functions used will be those of nvOpenGL.dll (f.i.),
I’m just wondering if there won’t be circumstanced in which
SDL’s OpenGL12.dll won’t be the same as the one loaded
by OpenGL12.pas.
This being asserted by the fact that SDL offers a function to
dynamically bind to the OpenGL function… So when using
SDL, it might be better to use the SDL’s GetProcAddress
function instead of the API’s GetProcAddress function
used in OpenGL12.pas (though they may be the same thing
in the current implementation).
Not sure if this explanation is clearer ; )

Any insight into this would be greatly appreciated.

Thanks,

Dominique
http://www.DelphiGamer.com

2

I get the feeling these posts are being ignored. Can anyone tell me why
this might be happening. Have I annoyed someone?

Thanks,

Dominique
http://www.DelphiGamer.com

Dominique Louis wrote:> Hi All,

Someone on the JEDI-SDL mailing list posted the following question,
and as I am not familiar with SDL’s internals I said I would refer it to
this newsgroup…

Does SDL Load the OpenGL library twice.

ie:

  • SDL.dll loads and binds itself to OpenGL12.dll
  • SDL.dll performs the initializations
  • OpenGL12.pas loads and binds itself to OpenGL12.dll
  • program uses bindings in OpenGL12.pas

The “OpenGL12.dll” will be the same DLL, and Windows
won’t load it twice, but if hardware acceleration is used, the
real functions used will be those of nvOpenGL.dll (f.i.),
I’m just wondering if there won’t be circumstanced in which
SDL’s OpenGL12.dll won’t be the same as the one loaded
by OpenGL12.pas.
This being asserted by the fact that SDL offers a function to
dynamically bind to the OpenGL function… So when using
SDL, it might be better to use the SDL’s GetProcAddress
function instead of the API’s GetProcAddress function
used in OpenGL12.pas (though they may be the same thing
in the current implementation).
Not sure if this explanation is clearer ; )

Any insight into this would be greatly appreciated.

Thanks,

Dominique
http://www.DelphiGamer.com