[Qtwebengine] QtWebEngine + ANGLE

[Kevin Ushey]

Thanks; I hadn't yet thought about setting QMLSCENE_DEVICE here. Currently,
when requesting software rendering we're using a plain old:

    QCoreApplication::setAttribute(Qt::AA_UseSoftwareOpenGL);

which I imagine implies using a software context for the scene renderer as
well, but we'll try testing this out as well.

On Wed, Aug 8, 2018 at 6:21 AM Jonathan Mérel <jmerel at druide.com> wrote:

> Hello,
>
> We have tried different settings, to ensure maximum compatibility with old
> PCs, and we found that "QMLSCENE_DEVICE=softwarecontext" is a good option.
>
>    - QT_OPENGL= desktop (ES2) ==> crash on some PCs, Doesen't support
>    RemoteFX.
>    - QT_OPENGL= angle + QT_ANGLE_PLATFORM = d3d11 ==> "Failed to create
>    OpenGL context" in VMs.
>    - QT_OPENGL= angle + QT_ANGLE_PLATFORM = warp ==> flicker, resize bugs
>    + black screen with RDP.
>    - QT_OPENGL= software ==> black screen with RDP.
>    - QMLSCENE_DEVICE=softwarecontext ==> no problems yet, but slower than
>    the other options.
>
> We also tried QT_OPENGL= desktop (MESA) but I don't recall the result.
>
>
> Jonathan
>
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