Java 游戏帧率下降

Question

我正在开发一个从图像加载关卡的平台游戏。它循环遍历图像的所有像素并检查 RGB 值是否与某个对象匹配，例如硬币的黄色，墙壁的白色。

一旦玩家死亡，关卡就会重新加载，但是当场景中还有炮塔时，游戏的帧率会下降。

循环遍历所有像素的方法。

    // Loads the requested level based on a image

public void loadLevel(BufferedImage Image)
{
    clearLevel();

    int imageWidth = Image.getWidth();
    int imageHeight = Image.getHeight();

    currentLevel = Image;

    for(int Par1 = 0; Par1 < imageHeight; Par1++)
    {
        for(int Par2 = 0; Par2 < imageWidth; Par2++)
        {
            int currentPixel = Image.getRGB(Par1, Par2);

            int redValue = (currentPixel >> 16) & 0xff;
            int greenValue = (currentPixel >> 8) & 0xff;
            int blueValue = (currentPixel) & 0xff;

            if(redValue == 255 && greenValue == 255 && blueValue == 255)
            {
                addObject(new Block((Par1 * 32), (Par2 * 32), 0, 0, 0, Identifier.Block));
            }

            if(redValue == 255 && greenValue == 0 && blueValue == 0)
            {
                addObject(new Block((Par1 * 32), (Par2 * 32), 1, 0, 0, Identifier.Lava));
            }

            if(redValue == 255 && greenValue == 0 && blueValue == 255)
            {
                addObject(new Block((Par1 * 32), (Par2 * 32), 5, 0, 8, Identifier.Platform));
            }

            if(redValue == 0 && greenValue == 255 && blueValue == 255)
            {
                addObject(new Block((Par1 * 32), (Par2 * 32), 4, 1, 8, Identifier.Platform));
            }

            if(redValue == 255 && greenValue == 255 && blueValue == 0)
            {
                addObject(new Block((Par1 * 32), (Par2 * 32), 2, 0, 0, Identifier.Coin));
            }

            if(redValue == 0 && greenValue == 255 && blueValue == 0)
            {
                addObject(new Block((Par1 * 32), (Par2 * 32), 3, 0, 0, Identifier.Flag));
            }

            if(redValue == 0 && greenValue == 0 && blueValue == 255)
            {
                addObject(new Player((Par1 * 32), (Par2 * 32), this, Identifier.Player));
            }

            if(redValue == 255 && greenValue == 175 && blueValue == 0)
            {
                addObject(new Turret((Par1 * 32), (Par2 * 32), this, Identifier.Turret));
            }
        }
    }

    Main.currentState = Main.State.Game;
}


// Reload level

public void reloadLevel()
{
    loadLevel(currentLevel);
}

游戏循环

// 在线程启动时运行，同时启动游戏循环并创建单独的滴答声和每秒帧数行

public void run() 
{
    try 
    {
        preInitialisation();
        initialisation();

        LogHandler.log("Initialisation complete.");
    } 

    catch(FileNotFoundException Error) 
    {
        Error.printStackTrace();
    } 

    catch(FontFormatException Error) 
    {
        Error.printStackTrace();
    } 

    catch(IOException Error) 
    {
        Error.printStackTrace();
    }

    requestFocus();

    long lastTime = System.nanoTime();

    double amountOfTicks = 60.0;
    double nanoSeconds = 1000000000 / amountOfTicks;
    double deltaValue = 0;

    long currentTime;   
    long loopTimer = System.currentTimeMillis();

    while(isRunning)
    {
        currentTime = System.nanoTime();
        deltaValue += (currentTime - lastTime) / nanoSeconds;
        lastTime = currentTime;

        while(deltaValue >= 1)
        {
            tick();

            deltaValue--;
            temporaryTicks++;
        }

        render();
        temporaryFrames++;

        if(System.currentTimeMillis() - loopTimer > 1000)
        {
            loopTimer += 1000;

            absoluteFrames = temporaryFrames;
            absoluteTicks = temporaryTicks;

            temporaryTicks = 0;
            temporaryFrames = 0;
        }
    }
}

Answer 1

原来添加 LWJGL 库，然后启用 vsync 解决了。

Display.setVSyncEnabled(true);

我还将所有的 LinkedLists 更改为 ArrayLists，因为它的速度更快，When to use LinkedList over ArrayList?