[vtkusers] Qt5/VTK application does not start correctly (with X11 forwarding)

[David Gobbi]

How are you doing the X11 forwarding?  Are you using "ssh -Y"?

On Fri, Aug 11, 2017 at 6:20 AM, Sophonet <vtk12af6bc42 at kant.sophonet.de>
wrote:

> Hi list,
>
> an application using VTK 8.0.0 and Qt 5.9.1 (built with -opengl desktop)
> does not start correctly (using X11 forwarding). After displaying an error
> message "failed to get the current screen resources", there is another
> error message
>
> vtkXOpenGLRenderWindow (0x55f891d77a80): GL version 2.1 with the
> gpu_shader4 extension is not supported by your graphics driver but is
> required for the new OpenGL rendering backend. Please update your OpenGL
> driver. If you are using Mesa please make sure you have version 10.6.5 or
> later and make sure your driver in Mesa supports OpenGL 3.2.
>
> However, my Ubuntu 17.04 system has Mesa 17.0.7, glxgears works fine
> (using X11 forwarding) and glxinfo shows (among other things) the correct
> driver - see below, so I am a bit puzzled what is going on. Any hints?
>
> Thanks,
>
> sophonet
>
> P.S.: The first call in my application's main() function is
> QSurfaceFormat::setDefaultFormat, see below. The same application runs
> fine and without problems on Windows.
>
> #if QT_VERSION >= 0x050500
>         // before initializing QApplication, set the default surface
> format, see documentation
>         QSurfaceFormat::setDefaultFormat(QVTKOpenGLWidget::defaultFo
> rmat());
> #endif
>
>
>
> GLX version: 1.2
> GLX extensions:
>     GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_import_context,
>     GLX_EXT_visual_info, GLX_EXT_visual_rating,
>     GLX_MESA_multithread_makecurrent, GLX_MESA_query_renderer,
>     GLX_OML_swap_method, GLX_SGIS_multisample, GLX_SGIX_fbconfig,
>     GLX_SGI_make_current_read
> Extended renderer info (GLX_MESA_query_renderer):
>     Vendor: VMware, Inc. (0xffffffff)
>     Device: llvmpipe (LLVM 4.0, 128 bits) (0xffffffff)
>     Version: 17.0.7
>     Accelerated: no
>     Video memory: 3949MB
>     Unified memory: no
>     Preferred profile: core (0x1)
>     Max core profile version: 3.3
>     Max compat profile version: 3.0
>     Max GLES1 profile version: 1.1
>     Max GLES[23] profile version: 3.0
> OpenGL vendor string: VMware, Inc.
> OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 4.0, 128 bits)
> OpenGL version string: 3.0 Mesa 17.0.7
> OpenGL shading language version string: 1.30
>
>
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