cocos2dx 在android下的帧频设置问题

最新推荐文章于 2020-07-22 10:16:55 发布

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最新推荐文章于 2020-07-22 10:16:55 发布

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分类专栏： cocos2dx 文章标签： android cocos2dx

本文链接：https://blog.youkuaiyun.com/yinjunfly111/article/details/12921233

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在尝试使用cocos2dx时，遇到通过setAnimationInterval设置为30帧但在Android设备上无效的问题。源码中发现FPS控制算法在某些设备上不准确并可能导致FPS降低。解决方案是通过程序逻辑，利用时间来控制游戏动作和逻辑。

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今天又遇到一个神坑，通过setAnimationInterval设置帧频为30帧，发现在android下没有效果。

最后在Cocos2dxRenderer .java文件里面找到了这个函数。里面有句注释 FPS controlling algorithm is not accurate, and it will slow down FPS
on some devices. So comment FPS controlling code.发现其实这段代码已经被屏蔽掉了。。。。

public void onDrawFrame(final GL10 gl) {

/*
* FPS controlling algorithm is not accurate, and it will slow down FPS
* on some devices. So comment FPS controlling code.
*/

/*
final long nowInNanoSeconds = System.nanoTime();
final long interval = nowInNanoSeconds - this.mLastTickInNanoSeconds;
*/

// should render a frame when onDrawFrame() is called or there is a
// "ghost"
Cocos2dxRenderer.nativeRender();

/*
// fps controlling
if (interval < Cocos2dxRenderer.sAnimationInterval) {
try {
// because we render it before, so we should sleep twice time interval
Thread.sleep((Cocos2dxRenderer.sAnimationInterval - interval) / Cocos2dxRenderer.NANOSECONDSPERMICROSECOND);
} catch (final Exception e) {
}
}

this.mLastTickInNanoSeconds = nowInNanoSeconds;
*/

}

---------------------------------------------------------------------------------------------------------

所以只能在程序逻辑上多做控制，用时间去控制动作和其他逻辑。

private long renderingElapsedTime;

@Override
public void onDrawFrame(final GL10 gl) {
    /*
     * FPS controlling algorithm is not accurate, and it will slow down FPS
     * on some devices. So comment FPS controlling code.
     */

    try {
        if (renderingElapsedTime< Cocos2dxRenderer.sAnimationInterval) {
            Thread.sleep((Cocos2dxRenderer.sAnimationInterval - renderingElapsedTime) / NANOSECONDSPERMICROSECOND);
        }
    } catch (InterruptedException e) {
        e.printStackTrace();
    }

    // Get the timestamp when rendering started
    long renderingStartedTimestamp = System.nanoTime();

    // should render a frame when onDrawFrame() is called or there is a
    // "ghost" 
    Cocos2dxRenderer.nativeRender();

    // Calculate the elapsed time during rendering
    renderingElapsedTime = (System.nanoTime() - renderingStartedTimestamp);
}

参考了下网上的解决方案，在真机上测试基本可以达到要求