Drawing standard widgets using a custom paint engine

[desert]

I've been doing some research and this is the closest i've found on Qt+OGRE shared OpenGL rendering.

But have you found a way to share the context instead of switching? Context switching might be costly. Have you read about

params["externalGLContext"] = Ogre::StringConverter::toString( ((unsigned long)(glXGetCurrentContext()) ) );
mRenderWindow = mOgreRoot->createRenderWindow("View", width(), height(), false, &params);

params["externalGLContext"] = Ogre::StringConverter::toString( ((unsigned long)(glXGetCurrentContext()) ) );
mRenderWindow = mOgreRoot->createRenderWindow("View", width(), height(), false, &params);

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Im doing this but seems OGRE insists on creating a new context.