def __init__(self, pipeline, image_source="/$$rp/data/gui/loading_screen_bg.txo"):
        """ Inits the loading screen with a given image source. By default,
        this is the pipeline loading screen, but it can be overridden. """
        RPObject.__init__(self)
        self.pipeline = pipeline
        self.image_source = image_source
 Inits the loading screen with a given image source. By default,
        this is the pipeline loading screen, but it can be overridden. 
metadrive/render_pipeline/rpcore/gui/loading_screen.py