纹理未渲染的顶部和右侧的LibGdx黑框

我刚开始用LibGdx创建一个游戏,但当我在窗口的顶部或右侧渲染纹理时,它不会显示在屏幕上。就像在纹理上画了两个黑框。 ( https://i.sstatic.net/goVAZ.png )

这是代码:

public class SpaceInvaders extends ApplicationAdapter {

    SpriteBatch batch;
    //MainUI mUI;

    Player p;

    @Override
    public void create () {
        batch = new SpriteBatch();
        Gdx.graphics.setResizable(false);
        Gdx.graphics.setWindowedMode(672, 768);
        //mUI = new MainUI(batch);
        p = new Player(batch);
    }

    @Override
    public void render () {

        // Update
        //mUI.update();
        p.update();

        // Render
        batch.begin();
        ScreenUtils.clear(0, 0, 0, 1);

        //mUI.render();
        p.render();

        batch.end();
    }

    @Override
    public void dispose () {
        batch.dispose();
    }
}

public class Player {

    SpriteBatch batch;
    Texture playerImg;
    Sprite sprite;
    //Projectile p;

    public int x = 0, y = Gdx.graphics.getHeight() - 300f;

    public Player(SpriteBatch batch) {
        this.batch = batch;
        playerImg = new Texture("res/player.png");
        sprite = new Sprite(playerImg);
    }

    public void update() {
        updateKeys();
        /*
        if(p != null) {
            p.update();
            if(p.y+p.image.getHeight() > Gdx.graphics.getHeight()) {
                p = null;
            }
        }
         */
    }

    private void updateKeys() {
        // D
        if(Gdx.input.isKeyPressed(32)) {
            x+=3;
            if(x+playerImg.getWidth() > Gdx.graphics.getWidth()) x = Gdx.graphics.getWidth()-playerImg.getWidth();
        }
        // A
        if(Gdx.input.isKeyPressed(29)) {
            x-=3;
            if(x < 0) x = 0;
        }
        // Space
        /*
        if(Gdx.input.isKeyPressed(62)) {
            if(p == null) {
                p =new Projectile(batch, x+playerImg.getWidth()/2-2, y+playerImg.getHeight()+1, 5);
            }
        }
         */
        sprite.setX((float) x);
        sprite.setY(Gdx.graphics.getHeight() - 300f);
    }

    public void render() {
        sprite.draw(batch);
        /*
        if(p != null) {
            p.render();
        }
         */
    }

}

我试着移除除了玩家之外的所有东西,但仍然不起作用。