Android游戏中的每秒帧数计数

Question

我正在寻找一种在游戏应用程序中计算每秒帧数的方法，问题是我没有这些应用程序的源代码，它们内部没有实现这样的功能。老实说，我真的不希望这是可能的，但值得一问。

为了完全清楚，我知道我需要主绘画循环的基本知识和代码来计算 FPS。

最好的问候

Answer 1

当你有一个主绘制循环时，计算 FPS 有什么问题（不是吗？）。

我不熟悉 Android 功能，但我确信它在任何操作系统上的任何游戏中都是一样的。制作游戏的最简单方法是制作 2 个线程。第一个将用于逻辑操作（计算轨迹、对象位置随时间的变化等）。第二个线程将获取当前游戏状态（由第一个线程计算）并将其绘制在屏幕上。

这是两个线程上的注释代码带有 FPS 计数器：

//Class that contain current game state
class GameState {
    private Point objectPosition;

    public Point getObjectPosition() {
        return objectPosition;
    }

    public void setObjectPosition(Point pos) {
        this.objectPosition = pos;
    }
}

//Runnable for thread that will calculate changes in game state
class GameLogics implements Runnable {
    private GameState gameState; //State of the game

    public GameLogics(GameState gameState) {
        this.gameState = gameState;
    }

    public void run() {
        //Main thread loop
        while (true) { //Some exit check code should be here
            synchronize (gameState) {
                gameState.setObjectPosition(gameState.getObjectPosition()+1); //Move object by 1 unit
            }
            Thread.sleep(1000); //Wait 1 second until next movement
        }
    }
}

//Runnable for thread that will draw the game state on the screen
class GamePainter implements Runnable {
    private Canvas canvas; //Some kind of canvas to draw object on
    private GameState gameState; //State of the game

    public GamePainter(Canvas canvas, GameState gameState) {
        this.canvas = canvas;
        this.gameState = gameState;
    }

    public void drawStateOnCanvas() {
        //Some code that is rendering the gameState on canvas
        canvas.drawLine(...);
        canvas.drawOtherLine(...);
        ....
    }

    public void run() {
        //Last time we updated our FPS
        long lastFpsTime = 0;
        //How many frames were in last FPS update
        int frameCounter = 0;

        //Main thread loop
                    //Main thread loop
        while (true) { //Some exit check code should be here
            synchronize (gameState) {
                //Draw the state on the canvas
                drawStateOnCanvas();
            }

            //Increment frame counter
            frameCounter++;

            int delay = (int)(System.getCurrentTimeMillis() - lastFpsTime);
            //If last FPS was calculated more than 1 second ago
            if (delay > 1000) {
                //Calculate FPS
                double FPS = (((double)frameCounter)/delay)*1000; //delay is in milliseconds, that's why *1000
                frameCounter = 0; //Reset frame counter
                lastFpsTime = System.getCurrentTimeMillis(); //Reset fps timer

                log.debug("FPS: "+FPS);
            }
        }
    }
}

Answer 2

我对 Android 游戏开发不太了解，但是在 Java2D 中（它有点 hacky 但它可以工作......）我会用编辑过的 JRE 类来 xboot 一个 jar，它控制渲染（例如 Canvas）到过程。

Answer 3

This is a good read 在游戏循环中。它解释了游戏循环的各种实现和优缺点。

this is a good tutorial 在 Android 中实现 gameloop + FPS 计数器。