[vtkusers] Is -DVTK_RENDERING_BACKEND=OpenGL needed for Haswell with 7.0.0?

[Elvis Stansvik]

2016-06-26 11:01 GMT+02:00 Elvis Stansvik <elvis.stansvik at orexplore.com>:

> 2016-05-25 17:08 GMT+02:00 Elvis Stansvik <elvis.stansvik at orexplore.com>:
>
>> 2016-05-25 13:49 GMT+02:00 Ken Martin <ken.martin at kitware.com>:
>>
>>> Yes, you should be fine with VTK 7.0, OpenGL2 and Haswell.  - Ken
>>>
>>
> Hm, initially it seemed like things were working fine. I was using the GPU
> based volume mapper without problems (using a modified
> QVTKRenderWindowInteractor), and I _think_ I was using the OpenGL2 backend
> (how can I tell btw?).
>
> But now, as I started trying to make a QOpenGLWidget-based Qt<->VTK
> adapter class instead, I get the following when trying to initialize the
> render window:
>
> ERROR: In
> /home/estan/Blandat/vtk-python3/src/VTK-7.0.0/Rendering/OpenGL2/vtkOpenGLRenderWindow.cxx,
> line 545
> vtkGenericOpenGLRenderWindow (0x205fb10): 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.
>
> And sure enough:
>
> estan at newton:~$ glxinfo | grep "OpenGL version"
> OpenGL version string: 3.0 Mesa 11.2.0
>
> However:
>
> estan at newton:~$ glxinfo | grep "OpenGL core profile version"
> OpenGL core profile version string: 3.3 (Core Profile) Mesa 11.2.0
>
> I'm a little unsure about which of these version numbers I should be
> looking at to see if my graphics has what it takes.
>
> Also, I'm now even unsure if I was ever using the OpenGL2 backend..
> perhaps VTK was falling back to OpenGL1 somehow, and that's why it worked
> in the beginning? Or is the selection of backend always a compile time
> thing?
>
> I build my VTK 7.0.0 in a Personal Package Archive at:
>
>     https://launchpad.net/~elvstone/+archive/ubuntu/vtk7
>
> and the full build log is at:
>
>
> https://launchpadlibrarian.net/261625779/buildlog_ubuntu-xenial-amd64.vtk7_7.0.0-0ubuntu2_BUILDING.txt.gz
>

Okay, so looking at that build log, I see:

-- Setting rendering backend to 'OpenGL2' as none was specified.
-- Backend OpenGL modules:
vtkRenderingContextOpenGL;vtkRenderingOpenGL;vtkRenderingLIC;vtkRenderingVolumeOpenGL;vtkRenderingGL2PS
-- Backend OpenGL2 modules:
vtkRenderingContextOpenGL2;vtkRenderingVolumeOpenGL2;vtkRenderingOpenGL2;vtkRenderingLICOpenGL2;vtkDomainsChemistryOpenGL2
-- Enabling modules for OpenGL2.


Does this mean I'll always be using the OpenGL2 backend, or that OpenGL vs
OpenGL2 is a runtime choice?

Elvis


>
> Any advice is much appreciated!
>
> I'm considering switching to the old OpenGL1 backend anyway, since I
> realized my laptop at home only has a Sandybridge chipset (at work it's
> Haswell), and it's convenient to be able to do some work from my home
> laptop. But I'd like to know why I get the above error on my work laptop,
> since I thought it'd be compatible.
>
> Elvis
>
>
>> Great, thanks!
>>
>> Elvis
>>
>>
>>>
>>> On Wed, May 25, 2016 at 4:50 AM, Elvis Stansvik <
>>> elvis.stansvik at orexplore.com> wrote:
>>>
>>>> Hi all,
>>>>
>>>> I'm about to try a compile of VTK 7.0.0 release on Ubuntu 16.04
>>>> (Xenial).
>>>>
>>>> The machine where I need this to run has a Haswell Intel graphics chip
>>>> (Intel(R) HD Graphics 4400), which supports the OpenGL 3.3 profile. Will
>>>> the new OpenGL backend (the version in 7.0.0) support this graphics card,
>>>> or will I need to use the old backend with -DVTK_RENDERING_BACKEND=OpenGL?
>>>>
>>>> I read that support for is for Ivy Bridge and later in 7.0.0, so I
>>>> think I should be OK right?
>>>>
>>>> Thanks in advance,
>>>> Elvis
>>>>
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>>>
>>>
>>> --
>>> Ken Martin PhD
>>> Chairman & CFO
>>> Kitware Inc.
>>> 28 Corporate Drive
>>> Clifton Park NY 12065
>>> 518 371 3971
>>>
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>>
>>
>
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