BUG: glGenVertexArrays segfaults, this time with attachment......

[Erik W. Bjønnes]

Hello :)

I seem to have run into a bug with the latest version of GLEW, 1.5.1 and
the command glGenVertexArrays(), in that it causes a segmentation fault no
matter what I do.

The system is a 64-bit Ubuntu 9.04, with the 190.18 drivers from Nvidia
and Freeglut 2.60.0 rc1, and the context is 3.1 forward_compatible.

Attached is a simple c++ program that reproduces the error with GLEW, but
not with glext.h.

I really hope this is something that can easily be fixed, since GLEW makes
it so much easier to deal with extension and multiple platforms.

Best regards,

Erik W. B.
Ps. Sorry for the lack of attachment in the previous message!


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[tom fogal-3]

 writes:
> I seem to have run into a bug with the latest version of GLEW, 1.5.1
> and the command glGenVertexArrays(), in that it causes a segmentation
> fault no matter what I do.
>
> Attached is a simple c++ program that reproduces the error with GLEW,
> but not with glext.h.

This doesn't compile on lenny.  GLUT_FORWARD_COMPATIBLE and GLUT_DEBUG
are not defined.  There are no prototypes for glutInitContextVersion or
glutInitContextFlags.

Lenny uses freeglut 2.4.0, it seems.

> I really hope this is something that can easily be fixed, since
> GLEW makes it so much easier to deal with extension and multiple
> platforms.

It's working on my (heavily modified) GLEW, after I adjust the code to
comment out the lines that can't compile.  Though I'm not sure how,
since the function isn't listed in the spec files in GLEW's repo.

Can you clarify when the function was added?  I see it in the OpenGL
3.1 spec, but was it added at 3.0 or 3.1?

-tom

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[Nigel Stewart-2]

 > Can you clarify when the function was added?  I see it in the OpenGL
 > 3.1 spec, but was it added at 3.0 or 3.1?

http://www.opengl.org/registry/specs/ARB/vertex_array_object.txt

auto/registry/ARB/vertex_array_object.txt

I'll try it on a 64-bit Fedora...

- Nigel

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[Nigel Stewart-2]

Erik,

I suggest the following addition to your program:

if (!GLEW_ARB_vertex_array_object)
     std::cerr << "ARB_vertex_array_object not available." << std::endl;

- Nigel

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[Erik W. Bjønnes]

Thank you for your suggestion Nigel,

I'll do just that, and stick to using the non-deprecated functions for now.
Hopefully it won't be too long before VAO's are working with GLEW.

Thank you to everyone else who also had a look at the problem.

-Erik

> Erik,
>
> I suggest the following addition to your program:
>
> if (!GLEW_ARB_vertex_array_object)
>      std::cerr << "ARB_vertex_array_object not available." << std::endl;
>
> - Nigel
>
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