QT5.9 Windows7 64bit QWebEngine WebGL --Could not share GL contexts.

[Ryosan]

Hi.
I would like to ask a question.
When I used QT5.7 or QT5.8 QWebEngine, I think there is no problem. in watching webGL Page.
But When I use QT5.9 QWebEngine,Most of All Page is not working..I got a Error Message

[7816:2000:0602/095657.738:ERROR:gl_context_wgl.cc(78)] Could not share GL contexts.
js: Error creating WebGL context.

I checked it on QWebEngine sample project WebEngine Demo Browser and WebEngine simple browser and so on.

for example,
[page viewing successed]
https://www.cubeslam.com/dsbkbx
[page viewing failed]
http://alteredqualia.com/three/examples/webgl_terrain_dynamic.html
http://potree.org/demo/potree_1.3/showcase/lion_head_simone_garagnani.html
etc..

I think Error Page might be using three.js?

when I access their failed Web page from Chrome Web Browser,there is no problem.but when I access their pages on from QT5.9 using webEngine application ,it is not.

my environment is Windows7 or 10 ,64bit intel HD Graphics
I try other PC,
Windows10[64bit),GTX980Ti(newdriver applied)

If there is any reason , Could you tell me solution?
thanks

[Climax]

Did you manage to solve this? I'm using a WebView from QML, but get the same error when trying to render WebGL on Windows.

[jee4404]

Hi,

Got the same issue on all our workstations here (win7, win10, nvidia or intel gpu, directx 12), even though Google Chrome has no problem render 3D views.
AFAIU, pre-compiled Qt binaries for windows are shipped by default with ANGLE as a graphic "gateway".
I'm currently recompiling the lib with -opengl desktop option to use graphic cards OpenGL drivers and check if it solves the issue.
Will post the answer when I'm done, hoping it could help

Cheers

[jee4404]

Well, after multiple recompile of the lib, with or without angle, angle combined, opengl desktop, opengl-es-2 still had context errors.
Found on another thread of this forum that I should try to call :

QCoreApplication::setAttribute(Qt::AA_UseOpenGLES);

This removed all the warnings and context errors !
Note that there is several value in the ApplicationAttribute enum that you could be interested in:

AA_UseDesktopOpenGL = 15,
AA_UseOpenGLES = 16,
AA_UseSoftwareOpenGL = 17,
AA_ShareOpenGLContexts = 18,

-jee

[Pulller]

@jee4404 I solve it follow your way. Thanks.
At the beginning, I used QCoreApplication::setAttribute(Qt::AA_ShareOpenGLContexts); but it didn't work.