[Interest] OpenGL and Quick in 5.4

Thomas Sevaldrud thomas at silentwings.no
Sat Dec 20 01:03:22 CET 2014

Ok, I finally figured it out :-)

The QML ApplicationWindow class has got a style now, and the default style
for the background is to fill the entire area in gray. By adding a custom
style with an empty item for the background it works again. i.e something
like this:

    style: ApplicationWindowStyle {

        background: Item {}


Although, this makes me wonder a bit. Is this really the recommended way of
mixing QML and custom OpenGL? Could I use the new QOpenGLSceneWindow for
this somehow?


On Fri, Dec 19, 2014 at 5:19 PM, Thomas Sevaldrud <thomas at silentwings.no>
> Hi,
> After upgrading to 5.4 my OpenGL applications no longer work. I am mixing
> OpenGL and Quick components, like in this example:
>    http://doc.qt.io/qt-5/qtquick-scenegraph-openglunderqml-example.html
> I.e I have a class derived from QuickItem with a QObject-based renderer
> that renders on the QQuickWindow::beforeRendering()-signal.
> This works nicely in 5.3, but in 5.4 my scene is painted over with light
> gray. (I have traced this in AMD CodeXL and have verified that my scene is
> rendered first, it is just painted over afterwards). It seems that this
> happens when the QML scene graph is rendered.
> I know that a lot of GL-related have changed in 5.4, so I guess that there
> is something that needs to be done differently, but I can't figure it out...
> The above mentioned example still works in 5.4, so it is probably
> something I'm doing wrong :)
> Cheers,
> Thomas
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