struct Device<'a>
{
    framebuffer: Texture<'a>,
    canvas: Canvas<Window>,
}

impl<'a> Device<'a>
{
    fn new(window: Window) -> Device<'a>
    {
        let (width, height) = window.size();
        let canvas_builder = window.into_canvas();
        let canvas = canvas_builder.build().unwrap();
        let creator = canvas.texture_creator();
        let framebuffer = creator.create_texture_streaming(PixelFormatEnum::RGB24, width, height).unwrap();
        Device { canvas: canvas, framebuffer: framebuffer }
    }
}