杀死Libgdx进程而不归咎于整个应用程序

Question

我正在利用Libgdx为3D Part制作一个关于Java的2D-3D游戏。到目前为止，我有纯菜写的菜单和2D游戏，我想用Libgdx做3D部分。

所以我设法启动了一个libgdx应用程序（用于桌面）并绘制了一个平面和一个盒子，盒子可以移动，就像相机一样。

问题是只有那个部分是在Libgdx的帮助下编写的。菜单和其他东西都是用Java编写的，我不想改变它。

所以我在Java菜单上点了一个Button，3D游戏就像这样开始：

public static LwjglApplication main() {
    LwjglApplicationConfiguration config = new LwjglApplicationConfiguration();
    config.forceExit = false;
    config.height = Game.HEIGHT;
    config.width = Game.WIDTH;
    config.title = "Game 3D";
    return new LwjglApplication(new SuperBomberman3D(), config);
}

所以现在我得到了新的窗口，这是有效的。有了F1，我就像这样关闭游戏：

game3D.exit();

将Game3D作为main（）返回的应用程序。

下一步是再次点击3D游戏按钮，窗口再次打开。虽然，这次，窗口不是我在配置中说的那个。这很奇怪。

无论如何，我尝试打开和关闭3D窗口几次，并且在某些时候，抛出异常：

Exception in thread "LWJGL Application" java.lang.RuntimeException: No OpenGL context found in the current thread.
at org.lwjgl.opengl.GLContext.getCapabilities(GLContext.java:124)
at org.lwjgl.opengl.GL11.glViewport(GL11.java:3261)
at com.badlogic.gdx.backends.lwjgl.LwjglGL20.glViewport(LwjglGL20.java:839)
at com.badlogic.gdx.backends.lwjgl.LwjglGraphics.setWindowedMode(LwjglGraphics.java:491)
at com.badlogic.gdx.backends.lwjgl.LwjglGraphics.setupDisplay(LwjglGraphics.java:166)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication.mainLoop(LwjglApplication.java:142)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:124)

我查看了互联网，但似乎没有任何东西适合我的问题。除了exit（）方法之外，我不会在SuperBomberman3D类之外调用任何方法。我不知道这个错误被抛出的地方或原因。无论如何，这里是SuperBomberman3D类，以防你在那里看到错误：

public class SuperBomberman3D extends ApplicationAdapter implements
    ApplicationListener {

public static LwjglApplication main() {
    LwjglApplicationConfiguration config = new LwjglApplicationConfiguration();
    config.forceExit = false;
    config.height = Game.HEIGHT;
    config.width = Game.WIDTH;
    config.title = "Super Bomberman 3D";
    return new LwjglApplication(new SuperBomberman3D(), config);
}

public PerspectiveCamera cam;
public CameraInputController camController;

public Model bombermanModel;
public Model planeModel;
public Environment env;
public ModelBatch modelBatch;

public ModelInstance bomberman;
public ModelInstance plane;

private int FIELD_OF_VIEW = 67;

private Vector3 initialPosition = new Vector3(10f, 10f, 10f);
private Vector3 origin = new Vector3(0, 0, 0);
private float near = 1f;
private float far = 300f;

@Override
public void create() {
    camera();
    models();
    environment();
}

private void camera() {
    cam = new PerspectiveCamera(FIELD_OF_VIEW, Gdx.graphics.getWidth(),
            Gdx.graphics.getHeight());
    cam.position.set(initialPosition);
    cam.lookAt(origin);
    cam.near = near;
    cam.far = far;
    cam.update();

    camController = new CameraInputController(cam);
    Gdx.input.setInputProcessor(camController);
}

private void models() {
    modelBatch = new ModelBatch();
    ModelBuilder mb = new ModelBuilder();
    bombermanModel = mb.createBox(5f, 5f, 5f,
            new Material(ColorAttribute.createDiffuse(Color.RED)),
            Usage.Position | Usage.Normal);
    bomberman = new ModelInstance(bombermanModel);

    planeModel = mb.createRect(-10, 0, 10,
            10, 0, 10,
            10, 0, -10,
            -10, 0, -10,
            0, 1, 0,
            GL20.GL_TRIANGLES,
            new Material(
                new ColorAttribute(
                    ColorAttribute.createDiffuse(Color.BLUE)),
                new BlendingAttribute(
                    GL20.GL_SRC_ALPHA,
                    GL20.GL_ONE_MINUS_SRC_ALPHA)),
            VertexAttributes.Usage.Position |
            VertexAttributes.Usage.TextureCoordinates);
    plane = new ModelInstance(planeModel);
}

private void environment() {
    env = new Environment();
    env.set(new ColorAttribute(ColorAttribute.AmbientLight, 0.2f, 0.2f,
            0.2f, 1f));
    env.add(new DirectionalLight().set(0.8f, 0.8f, 0.8f, -1f, -0.8f, -0.2f));
}

@Override
public void render() {
    step();

    camController.update();
    Gdx.gl.glViewport(0, 0, Gdx.graphics.getWidth(),
            Gdx.graphics.getHeight());
    Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT | GL20.GL_DEPTH_BUFFER_BIT);

    modelBatch.begin(cam);
    modelBatch.render(bomberman, env);
    modelBatch.render(plane, env);
    modelBatch.end();
}

public void step() {
    float x = 0;
    float z = 0;

    if(Gdx.input.isKeyPressed(Input.Keys.UP)){
        x = -0.2f;
    }
    if(Gdx.input.isKeyPressed(Input.Keys.DOWN)){
        x = 0.2f;
    }
    if(Gdx.input.isKeyPressed(Input.Keys.LEFT)){
        z = 0.2f;
    }
    if(Gdx.input.isKeyPressed(Input.Keys.RIGHT)){
        z = -0.2f;
    }

    bomberman.transform.translate(new Vector3(x, 0, z));

    if(Gdx.input.isKeyPressed(Input.Keys.F1)){
        StatesMachine.goToRoom(STATE.MAIN_MENU, false);
    }
}

@Override
public void dispose() {
    bombermanModel.dispose();
    planeModel.dispose();
    modelBatch.dispose();
}

}

所以，问题是为什么抛出错误，我如何把事情做好，另外说，为什么配置只设置好一次，当我调用game3D.exit()退出3D应用程序时然后我用main（）方法重做应用程序。