Using GLES2 in QT?

[BDC_Patrick]

hi there.. again..

I'm on the way to create my first 2D Engine and according to this, I create a 2D Editor with QT.
Everything runs well right now.. but I've come to a Problem I can't find a solution for.

I create my Engine based on the angleproject, more exactly: GLES2.
I managed to draw sprites in my SDL2 Window of the Runtime.
Now.. in the QT Editor, I want to preview those sprites, too.

Soo.. I included parts of the runtime Headers and sources, so I don't need to rewrite or Copy&Paste stuff. Means.. Generating quads, add shader, add texture.. is inside a function of my runtime.

Sow.. I want to use this same function in QT, but can't figure out, how?

I know, there is the QOpenGLWidget..
My question now is:
how to use this Widget as renderer for the code of the Runtime?

I tried to search myself through YouTube, Stack Overflow and some.. really old Topics here.. But nearly all of them use deprecated code (just saying.. glbegin.. glend..).

What I need:
Is there a more modern or really time present Tutorial of how to use extern GL context inside QT Widgets?