Re: [VirtualGL-Users] VirtualGL and Qt5

[Dr. R. G. <gro...@mh...>]

On 23/03/15 12:40, Dr. Roman Grothausmann wrote:
> With -DVGL_FAKEXCB=1 programmatical resizes now work (using vglconnect or within
> VNC session), but resizing the Qt5 window with the mouse or using maximize still
> leads to artefacts. Do You have any idea what could be the reason for this?

I just found on
http://svn.code.sf.net/p/virtualgl/code/tags/2.4/doc/index.html#hd0015
that vglrun has a +xcb option which is needed for this to work (an option vglrun 
-h does not list). With +xcb resizing the Qt5 window with the mouse or using 
maximize works as well.

Cheers,
Roman

> On 17/03/15 21:17, DRC wrote:
>> Rebuild VirtualGL 2.4 from source with -DVGL_FAKEXCB=1.
>>
>> This will be automatic in the next major release, but since the issue
>> was discovered after 2.4 went into beta, I felt it best to isolate the
>> new code.  Furthermore, libxcb is a more rapidly-changing API/ABI than
>> Xlib or GLX, so an XCB faker built for one platform won't work on all
>> platforms.  We are going to have to develop some sort of dynamic loading
>> mechanism for it, which will take some time.  For now, please build your
>> own custom version for whichever server platform you need to support.
>>
>>
>> On 3/17/15 9:19 AM, Dr. Roman Grothausmann wrote:
>>> Dear mailing list members,
>>>
>>>
>>> Are there any known problems of VirtualGL with Qt5?
>>> I'm working on a project (extensions to ITKSnap:
>>> https://github.com/pyushkevich/itksnap/pull/1) which has just recently
>>> moved to Qt5 and since then it seems that windows resizes do not work
>>> properly any more (new regions in the program stay black or contain
>>> artefacts, see *01.png) if the program is run with vglrun. Neither
>>> resizing the main window with the mouse, nor maximize, nor
>>> programmatical resizing works, this being the biggest problem, because
>>> the program does so for specific modes, one of these is the extension I
>>> work on.
>>> If I compile and run the application on my desktop PC everything works
>>> as expected (see *02.png). However, if run from a server with otherwise
>>> functioning VirtualGL it does not work, nor if recompiled on the server.
>>> It does work on the server for older versions of ITKSnap that build with
>>> Qt4.
>>> All together it gives me the impression the problem comes from the
>>> combination of VirtualGL with Qt5.
>>>
>>> Many thanks for any help or hints how to solve this.
>>> Roman
>>
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>

-- 
Dr. Roman Grothausmann

Tomographie und Digitale Bildverarbeitung
Tomography and Digital Image Analysis

Institut für Funktionelle und Angewandte Anatomie, OE 4120
Medizinische Hochschule Hannover
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D-30625 Hannover

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