[Libgdx] Viewport example

public class Main extends Game {
        public static final int V_WIDTH = 1920;
        public static final int V_HEIGHT = 1080;

        OrthographicCamera cam;
        Stage stage;

        TextureAtlas atlas;
        Image Logo;

        @Override
        public void create () {
                cam = new OrthographicCamera();
                cam.setToOrtho(false, 800, 600);

                stage = new Stage(new FitViewport(V_WIDTH, V_HEIGHT, cam));

                atlas = new TextureAtlas("LoadingScreen.pack");
                Logo = new Image(atlas.findRegion("Logo1"));

                Logo.setX(stage.getWidth() / 2 - Logo.getWidth() / 2);
                Logo.setY(stage.getHeight() / 2 - Logo.getHeight() / 2);
                stage.addActor(Logo);
        }

        @Override
        public void resize(int width, int height) {
                stage.getViewport().update(width, height, false);
        }

        @Override
        public void render () {
                Gdx.gl.glClearColor(1, 0, 0, 1);
                Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);

                stage.act();
                stage.draw();
        }

        @Override
        public void dispose() {
                atlas.dispose();
                stage.dispose();
        }
}