1. 性能影响分析

1.1 setEGLConfigChooser

其参数对性能影响极大，下面的代码在同样的Android设备上运行，其fps变化相当大。

注：FrameBuffer Resolution为1080P。

public class Demo2 extends Cocos2dxActivity{     protected void onCreate(Bundle savedInstanceState){  super.onCreate(savedInstanceState);  }    public Cocos2dxGLSurfaceView onCreateView() {     Cocos2dxGLSurfaceView glSurfaceView = new Cocos2dxGLSurfaceView(this);     // Demo2 should create stencil buffer     //glSurfaceView.setEGLConfigChooser(5, 6, 5, 0, 16, 8); // fps: 56     glSurfaceView.setEGLConfigChooser(8, 8, 8, 8, 16, 0);   // fps: 41          return glSurfaceView;    }    static {        System.loadLibrary("cocos2dcpp");    }     }

1.2 android:theme对fps的影响

前提条件为：glSurfaceView.setEGLConfigChooser(8, 8, 8, 8, 16, 0);

Theme.Translucent: FPS(12.6)

Theme.NoTitleBar.Fullscreen: FPS(41)

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"      package="com.test.game2"      android:versionCode="1"      android:versionName="1.0">    <uses-sdk android:minSdkVersion="8"/>    <uses-feature android:glEsVersion="0x00020000" />    <application android:label="@string/app_name"        android:icon="@drawable/icon">        <activity android:name=".Demo2"                  android:label="@string/app_name"                  android:screenOrientation="landscape"                  ###android:theme="@android:style/Theme.Translucent"  ###fps：12.6    android:theme="@android:style/Theme.NoTitleBar.Fullscreen"  ###fps:41                   android:configChanges="orientation">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application>    <supports-screens android:largeScreens="true"                      android:smallScreens="true"                      android:anyDensity="true"                      android:normalScreens="true"/>                             <uses-permission android:name="android.permission.INTERNET"/></manifest>

2. Video+3D

背景层：Video

前景层：3D (其背景透明)

2.1 Cocos2dxActivity.java

其主要功能为：

1) 增加一个SurfaceView用于显示Video，其代码如下：

public SurfaceView mediaPlayView; //成员变量，可供其子类访问

mediaPlayView = new SurfaceView(this);
framelayout.addView(mediaPlayView);

2) 使GLSurfaceView背景透明并置于前景，其代码如下：

this.mGLSurfaceView.setEGLConfigChooser(8 , 8, 8, 8, 16, 0);
this.mGLSurfaceView.getHolder().setFormat(PixelFormat.TRANSLUCENT);
this.mGLSurfaceView.setZOrderOnTop(true);

2.2 Demo2.java

其主要功能为：进行视频播放，其完整代码如下：

package com.test.game2;import org.cocos2dx.lib.Cocos2dxActivity;import org.cocos2dx.lib.Cocos2dxGLSurfaceView;import android.os.Bundle;// Added by Luoxx for video playerimport android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.View;import android.media.MediaPlayer;import android.util.Log;import java.io.IOException;public class Demo2 extends Cocos2dxActivity{ private static final String TAG="MyMP";  private SurfaceHolder mediaSurfaceHolder = null; private MediaPlayer  mediaPlayer; private boolean isMediaPlay = false;     protected void onCreate(Bundle savedInstanceState){  super.onCreate(savedInstanceState);   initVideo(); }    public Cocos2dxGLSurfaceView onCreateView() {     Cocos2dxGLSurfaceView glSurfaceView = new Cocos2dxGLSurfaceView(this);     // Demo2 should create stencil buffer     glSurfaceView.setEGLConfigChooser(5, 6, 5, 0, 16, 8);          return glSurfaceView;    }    static {        System.loadLibrary("cocos2dcpp");    }      private void initVideo(){     mediaSurfaceHolder = mediaPlayView.getHolder();     mediaSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);     mediaSurfaceHolder.addCallback(new MediaSurfaceHolderCallBack()); }  MediaPlayer.OnPreparedListener mPreparedListener = new MediaPlayer.OnPreparedListener() {  @Override  public void onPrepared(MediaPlayer mp) {   Log.d(TAG,"onPrepared...");   int mVideoWidth = 0;   int mVideoHeight = 0;   mVideoWidth = mp.getVideoWidth();   mVideoHeight = mp.getVideoHeight();   mediaSurfaceHolder.setFixedSize(mVideoWidth, mVideoHeight);      mp.start();      isMediaPlay = true;      // test   /*      try{       // startup Get Pos Thread       mPosThread = new GetPosThread();       mPosThread.start();       } catch (Exception e) {       e.printStackTrace();      }*/  } };  private MediaPlayer.OnCompletionListener mCompletionListener = new MediaPlayer.OnCompletionListener() {  public void onCompletion(MediaPlayer mp) {   Log.d(TAG,"onCompletion...");   //isMediaPlay = false;   mp.seekTo(0);   mp.start();  } };  private class MediaSurfaceHolderCallBack implements SurfaceHolder.Callback{  @Override  public void surfaceChanged(SurfaceHolder holder, int format, int width,    int height) {   Log.d(TAG,"surfaceChanged...,width="+width+", height="+height);     }  @Override  public void surfaceCreated(SurfaceHolder holder) {   Log.d(TAG,"surfaceCreated...");      mediaPlayer = new MediaPlayer();      mediaPlayer.setOnPreparedListener(mPreparedListener);   mediaPlayer.setOnCompletionListener(mCompletionListener);      try {    mediaPlayer.setDataSource("/sdcard/NativeMedia.ts");    //mediaPlayer.setDataSource("/sdcard/video/aoa.mp4");   } catch (IllegalArgumentException e) {    e.printStackTrace();   } catch (IllegalStateException e) {    e.printStackTrace();   } catch (IOException e) {    e.printStackTrace();   }   mediaPlayer.setDisplay(mediaSurfaceHolder);      try {    mediaPlayer.prepareAsync();    } catch (IllegalStateException e) {    e.printStackTrace();   }   }  @Override  public void surfaceDestroyed(SurfaceHolder holder) {   if( mediaPlayer.isPlaying() ){    mediaPlayer.stop();    mediaPlayer.release();    mediaPlayer = null;   }   if( mediaSurfaceHolder != null ){    mediaSurfaceHolder = null;   }  }    }}

2.3 CCDirector.cpp

在render每一帧之前，调用glClearColor(0.0f,0.0f,0.0f,0.0f); 以使3D层透明，其详细代码如下：

// Draw the Scenevoid CCDirector::drawScene(void){    // calculate "global" dt    calculateDeltaTime();    //tick before glClear: issue #533    if (! m_bPaused)    {        m_pScheduler->update(m_fDeltaTime);    }        glClearColor(0.0f,0.0f,0.0f,0.0f); // add it to make 3D transparent    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);    /* to avoid flickr, nextScene MUST be here: after tick and before draw.     XXX: Which bug is this one. It seems that it can't be reproduced with v0.9 */    if (m_pNextScene)    {        setNextScene();    }    kmGLPushMatrix();    // draw the scene    if (m_pRunningScene)    {        m_pRunningScene->visit();    }    // draw the notifications node    if (m_pNotificationNode)    {        m_pNotificationNode->visit();    }        if (m_bDisplayStats)    {        showStats();    }        kmGLPopMatrix();    m_uTotalFrames++;    // swap buffers    if (m_pobOpenGLView)    {        m_pobOpenGLView->swapBuffers();    }        if (m_bDisplayStats)    {        calculateMPF();    }}

或如下代码：

void CCDirector::setGLDefaultValues(void){    // This method SHOULD be called only after openGLView_ was initialized    CCAssert(m_pobOpenGLView, "opengl view should not be null");    setAlphaBlending(true);    // XXX: Fix me, should enable/disable depth test according the depth format as cocos2d-iphone did    // [self setDepthTest: view_.depthFormat];    setDepthTest(false);    setProjection(m_eProjection);    // set other opengl default values    //glClearColor(0.0f, 0.0f, 0.0f, 1.0f);    glClearColor(0.0f, 0.0f, 0.0f, 0.0f); // to make 3D Layer transparent}

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Cocos2d-x V2 2 2 性能分析和透明处理