I have a custom QQuickFramebufferObject node which renders a texture on some geometry. Now I want to render a Qml item to a texture (e.g. QOpenGLTexture) and use this texture in my custom node. I know that there is the grabToImage (http://doc.qt.io/qt-5/qquickitem.html#grabToImage) method but this method is slow because it first renders everything into a QImage and data has to be transferred from/to the GPU.
In detail, I am looking for something like ShaderEffectSource element but with direct access to the texture id which can be used as a texture in the QQuickFramebufferObject. Is there already something implemented in Qt for this scenario?
