QtQuick into an SDL2 window

[Illogica]

Hello gentlemen

Given an existing SDL_GLContext, what's the best approach to render QtQuick components into it?
I see there's a QQuickRenderControl class which I can initialize with a QOpenGLContext, but I fail to see how to convert the SDL_GLContext into a QOpenGLContext.

[A Former User]

@Illogica Hi! There is this nice Scene Graph - OpenGL Under QML example; might be helpful.

[Illogica]

Thanks @Wieland for the response,
all the examples I see show how to render into a Qt widget.
What I want to do, is render QtQuick components inside the SDL window of my game engine.
I found an example of this here but it's lacking a real implementation.
It seems to me I need to use QOpenGLContext::setNativeHandle() passing it the GL context of my SDL window, but it would be extremely useful seeing a (cross platform) code example.

[Illogica]

According to the QWGLNativeContext documentation and some online examples, I set up this little function to try and initialize a QOpenGLContext from an existing and already initialized SDL2 context:

void QtHooks::initQtOpenGlContext(SDL_Window *screen)
{
    assert(screen);
    QOpenGLContext *context = new QOpenGLContext;
    SDL_SysWMinfo sysInfo;
    SDL_VERSION(&sysInfo.version);
    SDL_GetWindowWMInfo(screen, &sysInfo);
    HGLRC currentContext = wglGetCurrentContext();
    HWND currentWindow = sysInfo.info.win.window;
    assert(currentContext);
    assert(currentWindow);

    QWGLNativeContext nativeContext(currentContext, currentWindow);
    context->setNativeHandle(QVariant::fromValue(nativeContext));

    assert(qtContext->isValid());   // <<-- this line always fails 
    context->create();       // if i remove the previous assert, this line kills the application very badly
}

This little example always fails in the last two lines. Am I missing something?