[Interest] Draw own QQuickItem using OpenGL together with QQuickApplicationEngine

[Axel Jäger]

Hello,
I am trying to start a new application and want to start with the most
modern possible codebase so I am looking into different options. The
application I want to develop consists of a large OpenGL-View togehter with
some slider next to it to change some parameters of the view. I have a large
experience in building widget based applications in Qt but just for the fun,
I want to go for QML way.

I found this example that shows how to combine OpenGL-Drawing with with
QML-Items:

http://doc.qt.io/qt-5/qtquick-scenegraph-openglunderqml-example.html

Then I found the Qt Quick Controls template in QtCreator that uses
QQuickApplicationEngine which seems even more sophisticated than just using
a QQuickView with a QML-File as a root item.
I tried adopting the first example to use QQuickApplicationEngine by
changing the main-method according to the template and changed the main.qml
to use ApplicationWindow instead of Item as the root object. The effect is
that I see all the QML Items in a window but the custom opengl drawing is
not displayed. I see from the debugger that the opengl drawing code is
executed.


Attached you will find my modified example. I guess that I just did
something very stupid and the viewport of my custom opengl items is
something like 0x0.
I would be very happy if there was a an example that uses
QQuickApplicationEngine to load a qml-file with an ApplicationWindow and
that does some OpenGL drawing besides QtQuick based controlls.
Any help is greatly appriciated.

Best reagards,

Axel

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