Re: [PyOpenGL-Users] Using PyopenGL with GLArea

[Matti K. <mat...@gm...>]

I will take a look on Saturday.

1) In the meantime, could you create a minimal example that demonstrates 
the problem?

Its always very interesting to see simple-looking code that works on 
some platforms but doesn't work on others; we just had an example of 
such two weeks ago from another user.

Ideally your minimal example would not involve the use of the `gi' 
module, or at the very least, include instructions to bring a fresh 
installation up with that package installed, i.e. "sudo apt-get install 
..."

2) Does your problem require `gi' for this error to show?

3) Is the error reproducible under GLUT or GLFW?

4) If (2), what steps are needed to install `gi', and what version of `gi'?

On 3/5/17 12:49 PM, Oly wrote:
> Just another thing of note,
>
> using PYOPENGL_PLATFORM = "osmesa" with x11 causes the same issue, so 
> it would appear related to the mesa drivers.
>
> What other options can that take, can i enforce nvidia or intel 
> instead of osmesa ?
>
> perhaps wayland is defaulting to mesa and x11 is using something else.
>
> feels like i am getting nearer to a solution, or at least a work around.
>
>
>
> On Sun, 5 Mar 2017 at 17:29 Oly <ol...@gm... 
> <mailto:ol...@gm...>> wrote:
>
>     Also because it maybe useful, i have this being reported by gtk /
>     opengl.
>
>     Intel_Open_Source_Technology_Center_4.5_(Core_Profile)_Mesa_17.0.0_-_padoka_PPA_Mesa_DRI_Intel(R)_Kabylake_GT2__4.50
>     OpenGL Version 4.5_(Core_Profile)_Mesa_17.0.0_-_padoka_PPA
>     OpenGL Renderer Mesa_DRI_Intel(R)_Kabylake_GT2_
>     Shader Language version 4.50
>
>     so it looks like things should be new enough to support that
>     feature under wayland.
>
>
>     On Sun, 5 Mar 2017 at 17:28 Oly <ol...@gm...
>     <mailto:ol...@gm...>> wrote:
>
>         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... <mailto: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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