Opengl and extension

Opengl and extension

[Eddy Cappeau]

Hi

I've tried to use multitexture extension of opengl with gnat,
but this extension isn't in the list returned by glGetString.

However, with the same program in C, compiled with  VC++,
the extensions si present.

Are the gnat library too old ? If it's so, where can I find a newer one ?

Eddy

Re: Opengl and extension

[Stephen Leake]

"Eddy Cappeau" <cappeau@yahoo.com> writes:

> Hi
> 
> I've tried to use multitexture extension of opengl with gnat,
> but this extension isn't in the list returned by glGetString.
> 
> However, with the same program in C, compiled with  VC++,
> the extensions si present.
> 
> Are the gnat library too old ? If it's so, where can I find a newer one ?

The GNAT distribution does not include an OpenGL library. So you must
have gotten the OpenGL library somewhere else.

What OS are you on?

-- 
-- Stephe

Re: Opengl and extension

[Eddy Cappeau]

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I'm on Win 2K
There is a libopengl32.a in my Gnat/lib directory.
I though it was provided by the gnat.

"Stephen Leake" <stephen.a.leake.1@gsfc.nasa.gov> a �crit dans le message
news: uwupmate3.fsf@gsfc.nasa.gov...
> "Eddy Cappeau" <cappeau@yahoo.com> writes:
>
> > Hi
> >
> > I've tried to use multitexture extension of opengl with gnat,
> > but this extension isn't in the list returned by glGetString.
> >
> > However, with the same program in C, compiled with  VC++,
> > the extensions si present.
> >
> > Are the gnat library too old ? If it's so, where can I find a newer one
?
>
> The GNAT distribution does not include an OpenGL library. So you must
> have gotten the OpenGL library somewhere else.
>
> What OS are you on?
>
> --
> -- Stephe

Re: Opengl and extension

[Stephen Leake]

"Eddy Cappeau" <cappeau@yahoo.com> writes:

> I'm on Win 2K
> There is a libopengl32.a in my Gnat/lib directory.
> I though it was provided by the gnat.

A reasonable assumption :). Hmm. That file does appear in
GNAT/lib/win32 in my distribution; I did not look there the first
time, since you didn't say you were on Windows.

So now I get to ask; what version of GNAT do you have? The latest
public version is 3.14p; try upgrading to that. 

I suspect libopengl32.a is simply a binding to the Win32 OpenGL DLL; I
don't see why it would return different results via C. Very odd.

-- 
-- Stephe

Re: Opengl and extension

[Ted Dennison]

Stephen Leake wrote:
> I suspect libopengl32.a is simply a binding to the Win32 OpenGL DLL; I
> don't see why it would return different results via C. Very odd.

DLL's are supposed to strive to be backward-compatable, to the extent of 
fully supporting older interfaces. Perhaps the Ada bindings call into an 
older interface than the C bindings he is using.

Re: Opengl and extension

[Chris Moore]

Stephen Leake <stephen.a.leake.1@gsfc.nasa.gov> wrote in message news:<uadmhbypu.fsf@gsfc.nasa.gov>...

<snip>

> I suspect libopengl32.a is simply a binding to the Win32 OpenGL DLL; I
> don't see why it would return different results via C. Very odd.

Unless the C version links against, say, the NVIDIA implementation.

Chris Moore