[SOLVED] Creating a QQuickView with a shared opengl context.

extronus

How can i create a QQuickView which shares it's context with another?

extronus

It's not really an elegant solution but i think i found one.

Before setting QML file, (setSource) connect a slot to QQuickWindow::sceneGraphInitialized() signal like this :
@connect(this, SIGNAL(sceneGraphInitialized()), this, SLOT(onSceneGraphInitialized()), Qt::DirectConnection);@

when it hits the slot, do following :

@
openglContext()->blockSignals(true);
openglContext()->doneCurrent();
openglContext()->setShareContext(openGLContextToBeSharedWith);
openglContext()->setFormat(requestedFormat());
openglContext()->create();
openglContext()->makeCurrent(this);
openglContext()->blockSignals(false); // <- Forgot this line before
@

Martell Malone

hi Turgut,

How did you display it after extending the class?

extronus

As it was.
@
class MyView : QQuickView
{
Q_OBJECT
public :
MyView(QWindow *parent = 0) : QQuickView(parent)
{
connect(this, SIGNAL(sceneGraphInitialized()), this, SLOT(onSceneGraphInitialized()), Qt::DirectConnection);

  setPersistentOpenGLContext(true);
  backgroundContext = new QOpenGLContext(this);
  backgroundContext->setFormat(requestedFormat());
  backgroundContext->create();
  backgroundContext->makeCurrent(this);

  static bool openGLExtensionsInitialized = false;
  if (!openGLExtensionsInitialized) {
    OpenGL::initialize(backgroundContext);
    openGLExtensionsInitialized = true;
  }

  backgroundContext->doneCurrent();

}

protected slots :
onSceneGraphInitialized() {
openglContext()->blockSignals(true);
openglContext()->doneCurrent();
openglContext()->setShareContext(backgroundContext);
openglContext()->setFormat(requestedFormat());
openglContext()->create();
openglContext()->makeCurrent(this);
openglContext()->blockSignals(false);
}
protected :
QOpenGLContext *backgroundContext;
};

void someInitFunction()
{
MyView *view = new MyView();
view->setSource(QUrl("qrc:/script/init.qml"));
view->show();
app.exec();
}
@

Martell Malone

Many Thanks Turgut :)
I noticed what I was missing