[vtkusers] Combined on-screen and off-screen possible with VTK-7.0.0 on linux/X?
Elvis Stansvik
elvis.stansvik at orexplore.com
Fri Oct 28 09:45:11 EDT 2016
2016-10-28 15:31 GMT+02:00 Sophonet <vtk12af6bc42 at kant.sophonet.de>:
> Have you tried VTK 7.1.0.rc1? It includes the patch for combining on- and
> off-screen rendering (you need to set VTK_OPENGL_HAS_OSMESA=True). I have
> not tried it myself for OpenGL2, but if I recall correctly, the changes
> should not have been limited to OpenGL, but according to
> https://gitlab.kitware.com/vtk/vtk/blob/master/CMake/vtkOpenGL.cmake, line
> 48, VTK_USE_OFFSCREEN_EGL (Offscreen) may not be combined with VTK_USE_X
> (Onscreen).
Aha, thanks. I am using 7.1.0.rc1, but I'm not using that option. I'll
try turning it on.
Do you happen to know if there's an example of off-screen rendering
with VTK 7.x somewhere? The one at
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Utilities/OffScreenRendering
is for <= 5.10.
Elvis
>
>
>
> Am 2016-10-28 15:18, schrieb Elvis Stansvik:
>>
>> Sorry for sort of necro-posting to this old thread, but I'm also
>> interested in if on- and off-screen rendering is possible with the
>> same build of VTK 7.x (using OpenGL2 backend in my case)? Or will I
>> need separate builds of VTK for this purpose? (and if so, if there are
>> plans to fix that).
>>
>> Thanks in advance,
>> Elvis
>>
>> 2016-02-08 10:52 GMT+01:00 Michael Bachmann
>> <Michael.Bachmann at synopsys.com>:
>>>
>>> Hello list!
>>> Hello Sophonet!
>>>
>>> First of all:
>>> => Thank you Sophonet for investigating this issue and for describing the
>>> patch to "VTKROOT/CMake/vtkOpenGL.cmake".
>>> I applied your patch and it also re-enables offscreen rendering on a
>>> headless machine (were no X DISPLAY is available).
>>>
>>> Actually I really wonder why there are only a few posts about this issue.
>>> For the application I'm working on the ability of VTK7 to perform
>>> On-Screen and Off-Screen rendering with a single build of VTK is an absolute
>>> must-have! (Just like it was in VTK5 and VTK6)
>>>
>>> Please take the suggestion of Sophonet into account and re-enable it at
>>> least for the OpenGL rendering backend.
>>> Making this available for the OpenGL2 backend should also be considered.
>>>
>>> Building the software twice, e.g. like it is done for paraview
>>> (non-headless) and the paraview server (headless) is not an option for
>>> everyone.
>>> Actually is quite a big burden which has been silently put on the
>>> shoulders of VTK users.
>>>
>>> So please: Provide the facilities to perform On-Screen and Off-Screen
>>> rendering with a single build of VTK using OSMesa and X on Linux again!
>>>
>>> Best regards,
>>> Michael
>>>
>>>
>>>
>>> Date: Thu, 21 Jan 2016 14:54:46 +0100
>>> From: Sophonet <vtk12af6bc42 at kant.sophonet.de>
>>> To: vtkusers at vtk.org
>>> Subject: Re: [vtkusers] Combined on-screen and off-screen possible
>>> with VTK-7.0.0 on linux/X?
>>> Message-ID: <ac1f14a73f567e2e8e5916a5c942dc04 at srv19.sysproserver.de>
>>> Content-Type: text/plain; charset=UTF-8; format=flowed
>>>
>>> As one further follow-up of my two earlier e-mails, I have partly
>>> answered the question myself... remember, my question is related to the
>>> OpenGL (not OpenGL2) rendering backend.
>>>
>>> Two observations:
>>>
>>> 1. It seems that the current CMake flag VTK_OPENGL_HAS_OSMESA is useless,
>>> since it does not set anything relevant (see my e-mail below) 2. It seems
>>> that combined on-screen / off-screen rendering is possible (on Mesa 9.2.3
>>> using the OpenGL rendering backend):
>>>
>>> As a quick hack, I have changed VTKROOT/CMake/vtkOpenGL.cmake such
>>> that
>>>
>>> * VTK_USE_OSMESA = True (triggers find_package OSMesa)
>>> * VTK_USE_X = True (triggers find_package OpenGL)
>>>
>>> ...and (at the bottom) vtk_module_link_libraries links to *both*,
>>> ${OSMESA_LIBRARY} and ${OPENGL_LIBRARIES}.
>>>
>>> After this hack, I can successfully launch interactive
>>> (glx-)renderwindows as well as set (occasionally) set
>>> SetOffscreenRenderingOn().
>>>
>>> Therefore, my suggestion would be to
>>>
>>> - remove VTK_OPENGL_HAS_OSMESA
>>> - change the vtkOpenGL.cmake such that VTK_USE_OSMESA is exposed as an
>>> advanced option and is not exclusive w.r.t. VTK_USE_X, but may be set at the
>>> same time.
>>>
>>> Any comments?
>>>
>>> Thanks,
>>>
>>> Sophonet
>>>
>>>
>>> Am 2016-01-19 11:06, schrieb Sophonet:
>>>>
>>>> As a follow-up, I have done some more investigations myself and am
>>>> still lost:
>>>>
>>>> According to http://www.vtk.org/Wiki/VTK/OSMesa_Support, it seems that
>>>> the legacy OSMesa library on linux systems is not needed anymore, but
>>>> that software renderers (such as gallium llvm) can provide off-screen
>>>> rendering themselves. Correct?
>>>>
>>>> When looking at VTKROOT/CMake/vtkOpenGL.cmake, it appears (not
>>>> perfectly sure though) that in this case VTK_OPENGL_HAS_OSMESA needs
>>>> to be turned on, since this flag sets VTK_CAN_DO_OFFSCREEN to 1.
>>>> However, it seems to me that VTK_CAN_DO_OFFSCREEN is not used anywhere
>>>> else (did a thorough "grep" on that keyword in the source tree).
>>>>
>>>> It seems that Marcus (Hanwell) was responsible for many of these
>>>> changes in CMake - Marcus, can you help?
>>>>
>>>> What I would like to do is (see my first e-mail below) to
>>>> simultaneously use interactive rendering and (occasionally) off-screen
>>>> rendering (for generating static images), which was possible on Linux
>>>> in earlier versions of VTK (e.g. 5.10), but is not possible anymore.
>>>>
>>>> Thanks,
>>>>
>>>> Sophonet
>>>>
>>>>
>>>> Am 2016-01-15 12:44, schrieb Sophonet:
>>>>>
>>>>> Dear list,
>>>>>
>>>>> in my application, I would like to display a vtkRenderWindow for user
>>>>> interaction, but I also would like to use off-screen functionality
>>>>> simultaneously to render pre-defined views / snapshots that are shown
>>>>> as static images, like "thumbnails" for different datasets.
>>>>>
>>>>> This was possible in VTK 5.10 on linux (by creating a dedicated
>>>>> vtkRenderWindow per thumbnail, setting OffScreenRenderingOn,
>>>>> rendering and capturing the resulting image with a
>>>>> vtkWindowToImageFilter).
>>>>>
>>>>> In VTK-7.0.0.rc1, using the OpenGL rendering backend on Mesa 9.2.3, I
>>>>> now get a segfault with the following backtrace:
>>>>>
>>>>> (gdb) bt
>>>>> #0 0x00007fffd045db90 in xcb_glx_get_string_string_length ()
>>>>> from /usr/lib64/libxcb-glx.so.0
>>>>> #1 0x00007fffd0cce605 in ?? () from /usr/lib64/libGL.so.1
>>>>> #2 0x00007fffd0ccc2b6 in ?? () from /usr/lib64/libGL.so.1
>>>>> #3 0x00007fffd14cd086 in
>>>>> vtkOpenGLExtensionManager::ReadOpenGLExtensions() ()
>>>>> from
>>>>> /import/QUINTA/non-public/software/linux-install/quinta_gcc_debug/lib
>>>>> /libvtkRenderingOpenGL-7.0.so.1
>>>>> #4 0x00007fffd14cbd50 in vtkOpenGLExtensionManager::Update() ()
>>>>> from
>>>>> /import/QUINTA/non-public/software/linux-install/quinta_gcc_debug/lib
>>>>> /libvtkRenderingOpenGL-7.0.so.1
>>>>> #5 0x00007fffd14cafd7 in
>>>>> vtkOpenGLExtensionManager::ExtensionSupported(char const*) ()
>>>>> from
>>>>> /import/QUINTA/non-public/software/linux-install/quinta_gcc_debug/lib
>>>>> /libvtkRenderingOpenGL-7.0.so.1
>>>>> #6 0x00007fffd14ec8ea in vtkOpenGLRenderWindow::OpenGLInitContext()
>>>>> ()
>>>>> from
>>>>> /import/QUINTA/non-public/software/linux-install/quinta_gcc_debug/lib
>>>>> /libvtkRenderingOpenGL-7.0.so.1
>>>>> #7 0x00007fffd14eae6d in vtkOpenGLRenderWindow::OpenGLInit() ()
>>>>> from
>>>>> /import/QUINTA/non-public/software/linux-install/quinta_gcc_debug/lib
>>>>> /libvtkRenderingOpenGL-7.0.so.1
>>>>> #8 0x00007fffd1576932 in
>>>>> vtkXOpenGLRenderWindow::CreateOffScreenWindow(int, int) ()
>>>>>
>>>>> Besides a remark that probably there could be better error handling
>>>>> than just letting the app crash without an exception being thrown, I
>>>>> would like to know if joint on-screen rendering and off-screen
>>>>> rendering is still possible somehow with VTK-7.0.0.
>>>>>
>>>>> I have made two approaches when configuring via CMake: (i) Setting
>>>>> VTK_OPENGL_HAS_OSMESA=True (no effect, I think I remember that in
>>>>> earlier versions, this allowed OSMESA_INCLUDE_DIR etc. to be set;
>>>>> this is not the case anymore, so does this flag still do something?
>>>>> Note that for VTK 5.10 as mentioned above I did not have to set this
>>>>> explicitly), (ii) Setting USE_OFFSXCREEN_EGL=True - resulting in an
>>>>> error that this could not be combined with VTK_USE_X.
>>>>>
>>>>> On Windows, combining on-screen and off-screen rendering as described
>>>>> in the second paragraph is possible.
>>>>>
>>>>> Any suggestions would be welcome, the Wiki page I have found on this
>>>>> topic is not fully understandable to me
>>>>> (http://www.vtk.org/Wiki/VTK/OSMesa_Support; does this mean that I
>>>>> have to switch on VTK_OPENGL_HAS_OSMESA or not?...)
>>>>>
>>>>> Thanks,
>>>>>
>>>>> sophonet
>>>>>
>>>>>
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>>>>
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>
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