Re: [PyOpenGL-Users] Using PyopenGL with GLArea

[Oly <ol...@gm...>]

Thanks for the offer not sure how i missed your reply.

Anyway i made some progress, yes my issue is with linux and gtk
specifically I have also found out it has something todo with wayland.

Running the example i can get it to work with my intel and nvidia graphics
(optimus card) on x11 but if i am using wayland then i get the error above.

Not sure why wayland would effect what available to me anyone seen anything
similar ?

Seems it i graphics card related.

I did not know about this trick PYOPENGL_PLATFORM="osmesa" so thats useful
to know but it does not help unfortunately.


On Sun, 12 Feb 2017 at 20:20 Matti Kariluoma <mat...@gm...>
wrote:

> I tried to have a look at your code, but I don't have the `gi' package
> on my machine, and `pip install gi' can't find it either.
>
> 1) Would you accept help in the form of a program that starts with
> `from OpenGL import GLUT' , or does your problem require gi?
>
> As for the error you posted, looking at https://mesamatrix.net/ I see
> that glGenVertexArrays is a part of OpenGL 3.0, extension
> GL_ARB_vertex_array_object which seems to have broad support.
>
> 2) Maybe your graphics device (or its driver) is ancient?
>
> Since your gist seems to indicate you are using GTK, I assume you are
> running this under Linux. You may want to look into running PyOpenGL
> under mesa, using one of their software renderers if for whatever
> reason you don't have OpenGL3.0 support.
>
> Using the mesa CPU renderer under Linux:
>
> http://www.mattikariluoma.com/blog/Headless%20Rendered%20OpenGL%20Scenes.html
>
> >From: Oliver Marks <oly@di...> - 2017-02-11 22:40:09
> >
> >Thought i would have a stab at trying to make this work, I cant find any
> >existing working examples.
> >
> >I have linked a gist if any one want to try.
> >
> >currently I am getting this error.
> >
> >OpenGL.error.NullFunctionError: Attempt to call an undefined function
> >glGenVertexArrays, check for bool(glGenVertexArrays) before calling
> >
> >Which to me sounds like its not available to the context, GLArea is
> >supplying the context so i am unsure why this would be ?
> >
> >Any ideas or can anyone give me some pointers ?
> >
> >https://gist.github.com/olymk2/5b3e49ac83130e580bd9983f2e5d49c3
> >
>
>
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