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List:       pykde
Subject:    Re: [PyQt] Serious graphics issues with PyQt5 on newer Windows
From:       Lukas Erlacher <erlacher () in ! tum ! de>
Date:       2017-09-28 2:24:04
Message-ID: 05dc1caa-6398-7aae-8b79-4d636c08b516 () in ! tum ! de
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Hi,

great! I haven't been able to test this properly so far since I don't
have a system that reproduces the problem - so my experiments led me to
believe PyQt5 didn't support angle.

Where do you get d3dcompiler47.dll from? Is that part of the PyQt5
distribution?

Best,
Luke

On 09/28/2017 12:38 AM, Milorad Pop-Tosic wrote:
> Hi Luke,
> 
> 
> We've had the same problem on Windows and this is how we force using
> ANGLE on application startup:
> 
> 
> os.environ.setdefault('QT_OPENGL', 'angle')
> os.environ.setdefault('QT_ANGLE_PLATFORM', 'd3d9')
> 
> Make sure you put those lines before you import anything form
> PyQt5. You'll also need to deploy these three files with your app:
> libEGL.dll, libGLESv2.dll, d3dcompiler47.dll.
> 
> 
> Since Qt version 5.5 graphics drivers are chosen dynamically and the
> code above forces Qt to always use ANGLE.
> 
> More info
> here: http://doc.qt.io/qt-5/windows-requirements.html#dynamically-loading-graphics-drivers \
>  
> 
> An alternative would be to use OpenGL but fallback to ANGLE for certain
> graphics cards that are known to be problematic (same link given above).
> 
> Regards,
> Milorad
> ------------------------------------------------------------------------
> *From:* PyQt <pyqt-bounces@riverbankcomputing.com> on behalf of Lukas
> Erlacher <erlacher@in.tum.de>
> *Sent:* Tuesday, September 26, 2017 4:41:54 AM
> *To:* pyqt@riverbankcomputing.com
> *Subject:* [PyQt] Serious graphics issues with PyQt5 on newer Windows
> 
> Hello,
> 
> I am working on a project that has users on all kinds of windows and
> linux operating systems.
> 
> We recently migrated from pyqt4 (and python2) to pyqt5 (and python3.6).
> 
> For Windows, the software is built into a redistributable package using
> bdist_msi. You can find a build that shows the versions of all
> components used here:
> https://ci.appveyor.com/project/Sheeo/client/build/2363
> 
> A handful of users are now describing some serious issues that appear to
> be related to rendering.
> 
> Our application uses OpenGL rendering due to the widgets used and for
> some users on Windows (mostly Windows 10) this leads to the application
> not rendering correctly, with reports like this:
> 
> > The tabs are totally non-responsive for me. It looks like the client is frozen, \
> > but it actually isn't, it's just not outputting anything. Clicking on the tabs \
> > 'Coop missions' or 'Play' results in nothing happening. I can go to the Chat \
> > Lobby, but that is non-responsive as long as I stay on the tab.
> 
> The issue is probably caused by bad OpenGL support in the users'
> graphics drivers and/or bad implementation in Qt.
> 
> Is there anything I can do to fix this other than remove all widgets (it
> seems QWebEngineView is the culprit) that force OpenGL rendering?
> 
> Is there a version of PyQt5 with ANGLE rendering or is it practical to
> build one myself?
> 
> In the long run, this probably needs to be resolved by Qt or the
> graphics vendors fixing their OpenGL code - but for now, I need to keep
> my app working for my users.
> 
> Thanks in advance for any pointers towards a fix.
> 
> Best,
> Luke
> 

-- 
Mit freundlichen Grüßen,

Lukas Erlacher
RBG Systemgruppe
Rechnerbetriebsgruppe der Fakultäten Informatik und Mathematik
Technische Universität München


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