Function init_from_attributes_with_gl_attr 

pub fn init_from_attributes_with_gl_attr<R>(
    attributes: WindowAttributes,
    gl_attributes: GlAttributes,
) -> Result<(WinitGraphicsBackend<R>, WinitEventLoop), Error>
where
    R: From<GlesRenderer> + Bind<EGLSurface>,
    SwapBuffersError: From<R::Error>,

Available on crate feature backend_winit only.

Create a new WinitGraphicsBackend, which implements the Renderer trait, from a given WindowAttributes struct, as well as given GlAttributes for further customization of the rendering pipeline and a corresponding WinitEventLoop.