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

Elvis Stansvik elvis.stansvik at orexplore.com
Tue Jun 28 12:11:25 EDT 2016 

Den 28 juni 2016 4:24 em skrev "Ken Martin" <ken.martin at kitware.com>:
>
> Yes, the 7.0 default is opengl2. - Ken

Alright, thanks for the info Ken.

I've since ran into some problems with segfaults inside VTK when trying to
do volume rendering into my QOpenGLWidget-based VTK widget (as well as that
from another author), both on my home Sandybridge laptop and Haswell laptop
at work. So for now I've given up on using QOpenGLWidget and will stay with
QGLWidget, despite the inability to turn on multisampling, but if anyone
has time to look at my recent thread about this ("Segfault in
vtkOpenGLRenderWindow.OpenGLInitState and advice about render window in/out
events"), it would be much appreciated.

Elvis

>
> On Sun, Jun 26, 2016 at 5:45 AM, Elvis Stansvik <
elvis.stansvik at orexplore.com> wrote:
>>
>> 2016-06-26 11:42 GMT+02:00 Elvis Stansvik <elvis.stansvik at orexplore.com>:
>>>
>>> 2016-06-26 11:05 GMT+02:00 Elvis Stansvik <elvis.stansvik at orexplore.com
>:
>>>>
>>>> 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?
>>>
>>>
>>> I've now done some testing here at home, on my old Sandybridge laptop
which I think only has a HD 3000 graphics chip:
>>>
>>> [estan at pyret ~]$ glxinfo | grep "OpenGL version"
>>> OpenGL version string: 3.0 Mesa 11.2.2
>>>
>>> and the "Extended renderer info" section says:
>>>
>>> Extended renderer info (GLX_MESA_query_renderer):
>>>     Vendor: Intel Open Source Technology Center (0x8086)
>>>     Device: Mesa DRI Intel(R) Sandybridge Mobile  (0x126)
>>>     Version: 11.2.2
>>>     Accelerated: yes
>>>     Video memory: 1536MB
>>>     Unified memory: yes
>>>     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
>>>
>>> And it turns out that all I had to do in my little
QOpenGLWidget-adapter was:
>>>
>>>         surfaceFormat.setMajorVersion(3)
>>>         surfaceFormat.setMinorVersion(2)
>>>         surfaceFormat.setProfile(QSurfaceFormat.CompatibilityProfile)
>>>         self.setFormat(surfaceFormat)
>>>
>>> to request OpenGL 3.2 compatibility profile. After this I no longer get
the error and rendering seems to work.
>>>
>>> I'm actually a little surprised this works, since I didn't think my old
home laptop would support the OpenGL2 backend. And the glxinfo output shows
"Max compat profile version: 3.0". But printing the
.format().majorVersion() and .format().minorVersion() after setting it on
the QOpenGLWidget confirms that I've gotten the 3.2 format set.
>>>
>>> Oh well, I'm happy now, but would still like some clarification from
someone who knows more than me about these things.
>>
>>
>> For full disclosure, on this older home laptop I run Arch Linux and not
Kubuntu 16.04 like at work. The VTK I build using a custom Arch Linux
package which does
>>
>>   for lib in EXPAT FREETYPE JPEG PNG TIFF ZLIB LIBXML2 OGGTHEORA TWISTED
ZOPE SIX AUTOBAHN MPI4PY JSONCPP GLEW GL2PS; do
>>     cmake_system_flags+="-DVTK_USE_SYSTEM_${lib}:BOOL=ON "
>>   done
>>
>>   ...
>>
>>   cmake \
>>     -Wno-dev \
>>     -DCMAKE_SKIP_RPATH=ON \
>>     -DBUILD_SHARED_LIBS:BOOL=ON \
>>     -DCMAKE_INSTALL_PREFIX:FILEPATH=/usr \
>>     -DBUILD_DOCUMENTATION:BOOL=ON \
>>     -DDOCUMENTATION_HTML_HELP:BOOL=ON \
>>     -DDOCUMENTATION_HTML_TARZ:BOOL=ON \
>>     -DBUILD_EXAMPLES:BOOL=ON \
>>     -DVTK_USE_FFMPEG_ENCODER:BOOL=ON \
>>     -DVTK_BUILD_ALL_MODULES:BOOL=ON \
>>     -DVTK_USE_LARGE_DATA:BOOL=ON \
>>     -DVTK_QT_VERSION:STRING="5" \
>>     -DVTK_WRAP_JAVA:BOOL=ON \
>>     -DVTK_WRAP_PYTHON:BOOL=ON \
>>     -DVTK_WRAP_TCL:BOOL=ON \
>>     -DCMAKE_CXX_FLAGS="-D__STDC_CONSTANT_MACROS" \
>>     -DVTK_CUSTOM_LIBRARY_SUFFIX="" \
>>     -DVTK_INSTALL_INCLUDE_DIR:PATH=include/vtk \
>>     -DVTK_INSTALL_TCL_DIR=/usr/lib/tcl${_tkver}/vtk/ \
>>     -DVTK_PYTHON_VERSION=3 \
>>     -DPYTHON_EXECUTABLE=/usr/bin/python3 \
>>     -DPYTHON_INCLUDE_DIR=/usr/include/python3.5m \
>>     -DPYTHON_LIBRARY=/usr/lib/libpython3.5m.so \
>>     -DVTK_USE_SYSTEM_HDF5=OFF \
>>     ${cmake_system_flags} \
>>     -DCMAKE_BUILD_TYPE=Release \
>>     "${srcdir}/VTK-$pkgver" \
>>     -GNinja
>>
>>   ninja
>>
>> to build VTK. I don't have the build log for it, but I would think the
above would give me the OpenGL2 backend (?), since I didn't specify
anything special in the cmake command.
>>
>> Elvis
>>
>>>
>>> Elvis
>>>
>>>
>>>>
>>>> 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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>>>>>>>>
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>>>>>>>>
>>>>>>>> Please keep messages on-topic and check the VTK FAQ at:
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>>>>>>>>
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>>>>>>>>
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>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> Ken Martin PhD
>>>>>>> Chairman & CFO
>>>>>>> Kitware Inc.
>>>>>>> 28 Corporate Drive
>>>>>>> Clifton Park NY 12065
>>>>>>> 518 371 3971
>>>>>>>
>>>>>>> This communication, including all attachments, contains
confidential and legally privileged information, and it is intended only
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unauthorized. If you are not the intended recipient, any disclosure,
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>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>
>
>
> --
> Ken Martin PhD
> Chairman & CFO
> Kitware Inc.
> 28 Corporate Drive
> Clifton Park NY 12065
> 518 371 3971
>
> This communication, including all attachments, contains confidential and
legally privileged information, and it is intended only for the use of the
addressee.  Access to this email by anyone else is unauthorized. If you are
not the intended recipient, any disclosure, copying, distribution or any
action taken in reliance on it is prohibited and may be unlawful. If you
received this communication in error please notify us immediately and
destroy the original message.  Thank you.
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