[Interest] QGLContext rendering in a native window

[Thomas Sevaldrud]

Ok, it appears that I was overcomplicating this a bit :-)

The simple solution just creating a normal QWindow with a parent created
from QWindow::fromWinId((WId)hwnd).

At least this works just as I needed, although the documentation for
QWindow::setParent() should probably be updated? At least, the way I read
it, reparenting to a native window is only supported in X11 (last
paragraph):

"If *parent* is a window created by
fromWinId<http://qt-project.org/doc/qt-5/qwindow.html#fromWinId>(),
then the current window will be embedded inside *parent*, if the platform
supports it. Window embedding is currently supported only by the X11
platform plugin."


- Thomas


On Thu, Jan 30, 2014 at 12:51 PM, Thomas Sevaldrud <thomas at silentwings.no>wrote:

> 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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