[PyQt] pyQt5.7 and QtQuick

[Louis Simons]

That fixed it!  I still get the "Xlib:  extension "NV-GLX" missing on
display ":0"." warning, but my demo program works.  This has been a heck of
a quest.

Thanks,
Louis

On Mon, Oct 17, 2016 at 5:03 AM Arjen Hiemstra <a.hiemstra at ultimaker.com>
wrote:

> On Saturday, 15 October 2016 12:35:05 CEST Louis Simons wrote:
> > I built and installed PyQT and SIP from scratch on my installation, and
> now
> > get a little farther.  I think my Ubuntu default version of SIP wasn't
> the
> > latest which was causing weirdness.  I don't get a seg. fault, but I
> simply
> > get a white screen with a bunch of errors like the following:
> >
> > QOpenGLShaderProgram: could not create shader program
> > QOpenGLShader: could not create shader
> > QOpenGLShader: could not create shader
> > shader compilation failed:
> > ""
> > QOpenGLShaderProgram::uniformLocation( matrix ): shader program is not
> > linked
> > QOpenGLShaderProgram::uniformLocation( opacity ): shader program is not
> > linked
> > QOpenGLShaderProgram: could not create shader program
> > QOpenGLShader: could not create shader
> > QOpenGLShader: could not create shader
> > ...
> > Xlib:  extension "NV-GLX" missing on display ":0".
> >
> > I think the last line is key.  I've updated my graphics drivers to the
> > latest available for my graphics card (NVIDIA 340.98, had 340.96
> > previously), and I'm pretty sure "NV-GLX" really isn't missing since I
> can
> > still run the C++ version of the program.  PyQT QtWidgets still work
> fine.
> > It seems to be either something unique to using OpenGL from Python or
> from
> > PyQT.  Hoping that someone has seen something like this before and can
> > point me in the right direction, or at least something new to try.
>
> There is a known issue on Ubuntu when using PyQt OpenGL with NVidia binary
> drivers where it will load the Mesa GL libraries instead of the NVidia GL
> libraries and fail to compile shaders. See
> https://bugs.launchpad.net/ubuntu/
> +source/python-qt4/+bug/941826
> <https://bugs.launchpad.net/ubuntu/+source/python-qt4/+bug/941826> . The
> workaround is to use the following
> snippet before importing any OpenGL:
>
> import ctypes
> from ctypes.util import find_library
> libGL = find_library("GL")
> ctypes.CDLL(libGL, ctypes.RTLD_GLOBAL)
>
> This will ensure the right libGL is loaded before the dynamic loading
> process
> kicks in.
>
>
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