[Interest] QGLContext rendering in a native window

[Thomas Sevaldrud]

Hi,

I'm trying to use QGLContext to render into a native Win32 window, and I'm
wondering what'ts the best way to do this. What I've done this far is the
following:

Given a natively created window with a valid HWND, I Create a QWindow with
the following parameters:

    setSurfaceType(QWindow::OpenGLSurface);

    setFlags(Qt::ForeignWindow);

    setProperty("_q_foreignWinId", QVariant::fromValue((WId)hwnd));


The native window is already open, but I need to call show() on the QWindow
to trigger the Qt native window structures.

After this, I can create a QGLContext and make it current in the custom
QWindow, and I can even render to it, but I get a lot of warnings like these

QOpenGLContext::swapBuffers() called with non-exposed window, behavior is
undefined


It appears that the "exposed" flag is never set in the custom QWindow.

Any ideas how I can fix this? I can't find any convenient way to force the
expose flag in a QWindow. Or is there a cleaner way to achieve this?

Best regards,
Thomas
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