[Interest] Running code in the scene graph renderer thread

[Luca Carlon]

Hi! I'm implementing a plugin for Qt Multimedia for playing video and audio
using hardware acceleration. When opening a content which includes video, I
need to instantiate an OpenGL texture and an EGLImageKHR. To do this I need
to be in the thread with the current OpenGL context, which should be the
renderer thread.

I did this in a custom QML component (in the updatePaintNode method), and
everything is working correctly: but how do I execute my code in the
renderer thread of the scene graph from a Qt Multimedia plugin? What
options do I have?

I quickly read the Qt Multimedia plugin for Android, but that is a little
different because the texture is instantiated by the SurfaceTexture java
class.

Thanks!
Luca
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