How can QWindow replace QGLWidget?

Question

QT docs say that since qt5 you should use the QOpenGL* classes instead of QGL*. Problem is there is no QGLWidget replacement. I figured out that instead you should use QWindow in conjunction with QOpenGLContext and a call to setSurfaceType( OpenGLSurface );. Only problem is that a QWindow can't have QWidget as parent. So how can I embed a QWindow aka. my OpenGL drawing surface into other widgets?

Accepted Answer

QT 5.1 is in a weird situation OpenGL and `QWidget` (and derived) wise. There's no `QGLWidget` replacement yet all other QGL classes have clear replacements.

If you don't want to use the old `QGLWidget` you indeed have to manufacture yourself a replacement with `QWindow`. So, first you set up your `QWindow` then, as you correctly said call `setSurfaceType( OpenGLSurface );` before you call `create();` on it. Then you create a new `QOpenGLContext` and use its `makeCurrent()` function and pass your `QWindow`. Then you create a `QWidget` from the `QWindow` using `QWidget::createWindowContainer(window);`

But this is only a temporary hack, that you shouldn't have to use unless you actually want to mix QtQuick an QWidget. You can then replace this temporary hack with the actual replacement in 5.2.0 5.4.0 called QOpenGLWidget

How can QWindow replace QGLWidget?

Solution

Problem