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

[Elvis Stansvik]

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

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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