def load_plugin_shader(self, *args):
        """ Loads a shader from the plugin directory. This method is useful
        for RenderStages created by plugins. For a description of the arguments,
        see the load_shader function. """
        shader_path = "rpplugins/" + self._get_plugin_id() + "/shader/{0}"
        return self._get_shader_handle(shader_path, *args)
 Loads a shader from the plugin directory. This method is useful
        for RenderStages created by plugins. For a description of the arguments,
        see the load_shader function. 
metadrive/render_pipeline/rpcore/render_stage.py