Get QML Item texture in QQuickFramebufferObject

[PabloSkandal]

Hello,

I have a QML item made from a QQuickFramebufferObject and I want to create another QQuickFramebufferObject that receives this QML item and applies some fancy post-processing effects. I know it's easy to apply effects with QML but I need to do it in C++ with custom OpenGL code.

So far what I do is:

class MyEffect: public QQuickFramebufferObject
{
    Q_OBJECT
    Q_PROPERTY(QQuickItem* srcItem MEMBER m_ptSrcItem NOTIFY srcItemChanged)

    ...
}

and

MyEffect {
    id: effect

    anchors.fill: parent

    srcItem: ShaderEffectSource {
        sourceItem: myCustomItem
        hideSource: true
    }
}

The problem is that when I try to receive the texture from the Item, I get this error "QQuickImage::textureProvider: can only be queried on the rendering thread of an exposed window". I've been looking in the ShaderEffect source code and they seem to use QQuickItemPrivate to assign a window but I don't have access to that class.

Any thoughts?

Thanks!