Java LWJGL闪烁状态

Question

我有一个问题，当我按下Return键时，在INTRO状态（默认）下，它必须切换到GAME状态。 可以，但是如果这样做，它会在INTRO和GAME状态之间闪烁。 文本闪烁，底部的栏闪烁。

我试图打印出当前状态，似乎在这两个状态之间没有变化，但是当我运行该应用程序时，我的INTRO状态和GAME状态都在那里，并且正在闪烁。

public Renderer() {
    try {
        Display.setDisplayMode(new DisplayMode(screenWidth, screenHeight));
        Display.setTitle(gameTitle);
        Display.create();
    } catch (LWJGLException e) {
        e.printStackTrace();
        System.exit(0);
    }

    GL11.glMatrixMode(GL11.GL_PROJECTION);
    GL11.glLoadIdentity();
    GL11.glOrtho(0, 640, 0, 480, 1, -1);
    GL11.glMatrixMode(GL11.GL_MODELVIEW);

    lastFrame = getTime();


    while (!Display.isCloseRequested()) {
        //long delta = (long) getDelta();

        System.out.println(state);

        while (Keyboard.next()) {
            if(Keyboard.isKeyDown(Keyboard.KEY_RETURN)) {
                if(state == State.INTRO) {
                    clearCanvas();
                    state = State.GAME;
                }
            }
            if(Keyboard.isKeyDown(Keyboard.KEY_BACK)) {
                if(state == State.GAME) {
                    clearCanvas();
                    state = State.INTRO;
                }
            }
        }

        switch (state) {
        case INTRO:
            GL11.glColor3f(1.0f, 1.0f, 1.0f);
            TextDraw.drawString("PRESS 'RETURN' TO START GAME, and then hit CTRL z", Display.getWidth() / 2 - 160, Display.getHeight() / 2);
            TextDraw.drawString("CONTROLS:", Display.getWidth() / 2 - 30, Display.getHeight() / 2 - 50);
            TextDraw.drawString("1 key is Paint Red", Display.getWidth() / 2 - 70, Display.getHeight() / 2 - 70);
            TextDraw.drawString("2 key is Paint Green", Display.getWidth() / 2 - 70, Display.getHeight() / 2 - 85);
            TextDraw.drawString("3 key is Paint Blue", Display.getWidth() / 2 - 70, Display.getHeight() / 2 - 100);
            TextDraw.drawString("CTRL Z is Clear canvas", Display.getWidth() / 2 - 70, Display.getHeight() / 2 - 115);
            TextDraw.drawString("Escape to Close Program", Display.getWidth() / 2 - 70, Display.getHeight() / 2 - 130);
            break;
        case GAME:
            keyBindings();
            int MouseX = Mouse.getX();
            int MouseY = Mouse.getY();
            paint(MouseX, MouseY);
            break;
        }

        Display.update();
        Display.sync(250);
    }

    //Closed
    System.out.println("Program Closed");
    Display.destroy();
    System.exit(0);

}

Answer 1

尝试更换以下部件：

while (Keyboard.next()) {
        if(Keyboard.isKeyDown(Keyboard.KEY_RETURN)) {
            if(state == State.INTRO) {
                clearCanvas();
                state = State.GAME;
            }
        }
        if(Keyboard.isKeyDown(Keyboard.KEY_BACK)) {
            if(state == State.GAME) {
                clearCanvas();
                state = State.INTRO;
            }
        }
    }

有了这个：

if (Keyboard.isKeyDown(Keyboard.KEY_RETURN)){
    clearCanvas(); //Don't check for the state which is going to be true most likely, just adds confusion to coding
    state = State.GAME;
}

if (Keyboard.isKeyDown(Keyboard.KEY_BACK)){
    clearCanvas();
    state = State.INTRO;
}

如果您担心没有按任何键就可以提高速度，请不要担心。 差异确实很小，并且很可能不会引起注意。

另外，您不会清除屏幕！ 没有这些，各种残留物都可以留在那里！ 使用此方法在主循环中清除：

while (!Display.isCloseRequested()){
    GL11.glClear(GL_COLOR_BUFFER_BIT);
    //Rest of your code here
}