cocos2d-x游戏开发(四)游戏主循环

Cocos2d-x 前端之家
前端之家收集整理的这篇文章主要介绍了cocos2d-x游戏开发(四)游戏主循环，前端之家小编觉得挺不错的，现在分享给大家，也给大家做个参考。

欢迎转载：http://blog.csdn.net/fylz1125/article/details/8518737


终于抽时间把这个游戏写完了。由于没有自拍神器，所以把它移植到了Android上，用我的戴妃跑的很欢啊。自此，我算是完成了一个功能比较完善的游戏了。

麻雀虽小，五脏俱全，该有的都有，不该有的估计也有，嘿嘿。这几天把写这个游戏的经历和学习过程整理一下，多写几篇博客，就当做记笔记了。


首先还是就我个人的理解，讲讲游戏引擎的处理流程。

其实游戏逻辑简单化就是一个死循环，如下：

[cpp] view plain copy print ?
  1. @H_403_44@
  2. bool@H_403_44@game_is_running=true@H_403_44@;
  4. while@H_403_44@(game_is_running){
  5. update_game();
  6. display_game();
  7. }

我们所看到的游戏画面，游戏音乐，以及一些触控，输入等。在逻辑上就是这么一个死循环。这个循环一直在跑，期间会处理一些列的事件，简化之就是上面的两个函数。

cocos2d-x引擎也是如此，所有的逻辑都是在这个主循环下实现的。下面看看cocos2dx在各平台上的主循环实现。


1.Win

看它的main.cpp

?
    #include"main.h"@H_403_44@
  1. #include"../Classes/AppDelegate.h"@H_403_44@
  2. #include"CCEGLView.h"@H_403_44@
  4. USING_NS_CC;
  5. int@H_403_44@APIENTRY_tWinMain(HINSTANCE@H_403_44@hInstance,
  6. HINSTANCE@H_403_44@hPrevInstance,
  7. LPTSTR@H_403_44@lpCmdLine,87); font-weight:bold; background-color:inherit">int@H_403_44@nCmdShow)
  8. {
  9. UNREFERENCED_PARAMETER(hPrevInstance);
  10. UNREFERENCED_PARAMETER(lpCmdLine);
  11. //createtheapplicationinstance@H_403_44@
  12. AppDelegateapp;
  13. CCEGLView*eglView=CCEGLView::sharedOpenGLView();
  14. eglView->setFrameSize(2048,1536);
  15. //Theresolutionofipad3isverylarge.Ingeneral,PC'sresolutionissmallerthanit.@H_403_44@
  16. //Soweneedtoinvoke'setFrameZoomFactor'(onlyvalidondesktop(win32,mac,linux))tomakethewindowsmaller.@H_403_44@
  17. eglView->setFrameZoomFactor(0.4f);
  18. return@H_403_44@CCApplication::sharedApplication()->run();//注意这里@H_403_44@
  19. }

前面都不要关心，只是用来传递OpenGL窗口的，关键是最后一句，CCApplication::sharedApplication()->run()。看这个run函数：

?
    int@H_403_44@CCApplication::run()
  1. {
  2. PVRFrameEnableControlWindow(false@H_403_44@);
  3. //Mainmessageloop:@H_403_44@
  4. MSGmsg;
  5. LARGE_INTEGERnFreq;
  6. LARGE_INTEGERnLast;
  7. LARGE_INTEGERnNow;
  8. QueryPerformanceFrequency(&nFreq);
  9. QueryPerformanceCounter(&nLast);
  10. //Initializeinstanceandcocos2d.@H_403_44@
  11. if@H_403_44@(!applicationDidFinishLaunching())
  12. return@H_403_44@0;
  13. }
  14. CCEGLView*pMainWnd=CCEGLView::sharedOpenGLView();
  15. pMainWnd->centerWindow();
  16. ShowWindow(pMainWnd->getHWnd(),SW_SHOW);
  17. while@H_403_44@(1)//注意这里，主循环来了@H_403_44@
  18. if@H_403_44@(!PeekMessage(&msg,NULL,PM_REMOVE))
  19. //Getcurrenttimetick.@H_403_44@
  20. QueryPerformanceCounter(&nNow);
  21. //Ifit'sthetimetodrawnextframe,drawit,elsesleepawhile.@H_403_44@
  22. if@H_403_44@(nNow.QuadPart-nLast.QuadPart>m_nAnimationInterval.QuadPart)
  23. nLast.QuadPart=nNow.QuadPart;
  24. CCDirector::sharedDirector()->mainLoop();//看看这是神马@H_403_44@
  25. else@H_403_44@
  26. Sleep(0);
  27. continue@H_403_44@;
  28. if@H_403_44@(WM_QUIT==msg.message)
  29. //Quitmessageloop.@H_403_44@
  30. break@H_403_44@;
  31. //Dealwithwindowsmessage.@H_403_44@
  32. if@H_403_44@(!m_hAccelTable||!TranslateAccelerator(msg.hwnd,m_hAccelTable,&msg))
  33. TranslateMessage(&msg);
  34. DispatchMessage(&msg);
  35. }
  36. return@H_403_44@(int@H_403_44@)msg.wParam;
  37. }

不熟悉windows的童鞋估计都知道windows是消息驱动的。这个死循环就是用来处理windows的消息循环的，在其中处理了FPS逻辑，消息分发等。注意看其中红色标标注的
?
    @H_403_44@CCDirector::sharedDirector()->mainLoop();

这是神马东西啊！这个就是cocos2d-x的主循环了，由导演负责维护。从此就进入了cocos2d-x的世界，跟windows没有一毛钱关系了。


2.Android

Android平台的游戏是从一个Activity开始的。(话说好像Android的所有应用都是从Activity开始的吧)。

在引擎源码下有个目录是android的java代码，是模板代码，几乎所有的游戏都用这个，不怎么变。不信可以你可以看

YourCocos2dxDir/cocos2dx/platform/android/java这个目录，就是创建android工程的时候会去这个目录拷贝java代码作为模板。

来看看HelloCpp的代码

[java] ?
    package@H_403_44@org.cocos2dx.hellocpp;
  1. import@H_403_44@org.cocos2dx.lib.Cocos2dxActivity;
  2. import@H_403_44@android.os.Bundle;
  3. public@H_403_44@class@H_403_44@HelloCppextends@H_403_44@Cocos2dxActivity{
  4. protected@H_403_44@void@H_403_44@onCreate(BundlesavedInstanceState){
  5. super@H_403_44@.onCreate(savedInstanceState);
  6. static@H_403_44@{
  7. System.loadLibrary("hellocpp"@H_403_44@);
  8. }

很简单，对吧。几行代码而已，这里说明了两个问题

1. Cocos2dxActivity才是核心的Activity。

2. 游戏的C++部分包括引擎部分，被编译成了动态链接库hellocpp。这里就是加载了hellocpp动态链接库。

这个动态链接库是在用NDK编译的时候生成的，就是libs/armeabi/libhellocpp.so。（扯远了）


还是来看看Cocos2dxActivity这个Activity。

?
    public@H_403_44@abstract@H_403_44@class@H_403_44@Cocos2dxActivityextends@H_403_44@Activityimplements@H_403_44@Cocos2dxHelperListener{
  1. //===========================================================@H_403_44@
  2. //Constants@H_403_44@
  3. private@H_403_44@static@H_403_44@final@H_403_44@StringTAG=Cocos2dxActivity.class@H_403_44@.getSimpleName();
  4. //Fields@H_403_44@
  5. private@H_403_44@Cocos2dxGLSurfaceViewmGLSurfaceView;//注意这个SurfaceView@H_403_44@
  6. private@H_403_44@Cocos2dxHandlermHandler;
  7. //===========================================================@H_403_44@
  8. //Constructors@H_403_44@
  9. @Override@H_403_44@
  10. protected@H_403_44@void@H_403_44@onCreate(final@H_403_44@BundlesavedInstanceState){
  11. super@H_403_44@.onCreate(savedInstanceState);
  12. this@H_403_44@.mHandler=new@H_403_44@Cocos2dxHandler(this@H_403_44@);
  13. this@H_403_44@.init();
  14. Cocos2dxHelper.init(this@H_403_44@,this@H_403_44@);
  15. //Getter&Setter@H_403_44@
  16. //Methodsfor/fromSuperClass/Interfaces@H_403_44@
  17. @Override@H_403_44@
  18. protected@H_403_44@void@H_403_44@onResume(){
  19. super@H_403_44@.onResume();
  20. Cocos2dxHelper.onResume();
  21. this@H_403_44@.mGLSurfaceView.onResume();
  22. protected@H_403_44@void@H_403_44@onPause(){
  23. super@H_403_44@.onPause();
  24. Cocos2dxHelper.onPause();
  25. this@H_403_44@.mGLSurfaceView.onPause();
  26. public@H_403_44@void@H_403_44@showDialog(final@H_403_44@StringpTitle,final@H_403_44@StringpMessage){
  27. Messagemsg=new@H_403_44@Message();
  28. msg.what=Cocos2dxHandler.HANDLER_SHOW_DIALOG;
  29. msg.obj=new@H_403_44@Cocos2dxHandler.DialogMessage(pTitle,pMessage);
  30. this@H_403_44@.mHandler.sendMessage(msg);
  31. public@H_403_44@void@H_403_44@showEditTextDialog(final@H_403_44@StringpTitle,final@H_403_44@StringpContent,final@H_403_44@int@H_403_44@pInputMode,final@H_403_44@int@H_403_44@pInputFlag,final@H_403_44@int@H_403_44@pReturnType,final@H_403_44@int@H_403_44@pMaxLength){
  32. msg.what=Cocos2dxHandler.HANDLER_SHOW_EDITBox_DIALOG;
  33. msg.obj=new@H_403_44@Cocos2dxHandler.EditBoxMessage(pTitle,pContent,pInputMode,pInputFlag,pReturnType,pMaxLength);
  34. public@H_403_44@void@H_403_44@runOnGLThread(final@H_403_44@RunnablepRunnable){
  35. this@H_403_44@.mGLSurfaceView.queueEvent(pRunnable);
  36. //Methods@H_403_44@
  37. public@H_403_44@void@H_403_44@init(){
  38. //FrameLayout@H_403_44@
  39. ViewGroup.LayoutParamsframelayout_params=
  40. new@H_403_44@ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,153); list-style:decimal-leading-zero outside; color:inherit; line-height:20px; margin:0px!important; padding:0px 3px 0px 10px!important"> ViewGroup.LayoutParams.FILL_PARENT);
  41. FrameLayoutframelayout=new@H_403_44@FrameLayout(this@H_403_44@);//帧布局，可一层一层覆盖@H_403_44@
  42. framelayout.setLayoutParams(framelayout_params);
  43. //Cocos2dxEditTextlayout@H_403_44@
  44. ViewGroup.LayoutParamsedittext_layout_params=
  45. new@H_403_44@ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,248)"> ViewGroup.LayoutParams.WRAP_CONTENT);
  46. Cocos2dxEditTextedittext=new@H_403_44@Cocos2dxEditText(this@H_403_44@);
  47. edittext.setLayoutParams(edittext_layout_params);
  48. //...addtoFrameLayout@H_403_44@
  49. framelayout.addView(edittext);
  50. //Cocos2dxGLSurfaceView@H_403_44@
  51. this@H_403_44@.mGLSurfaceView=this@H_403_44@.onCreateView();
  52. framelayout.addView(this@H_403_44@.mGLSurfaceView);//添加GLSurfaceView@H_403_44@
  53. this@H_403_44@.mGLSurfaceView.setCocos2dxRenderer(new@H_403_44@Cocos2dxRenderer());//意这行，一个渲染器@H_403_44@
  54. this@H_403_44@.mGLSurfaceView.setCocos2dxEditText(edittext);
  55. //Setframelayoutasthecontentview@H_403_44@
  56. setContentView(framelayout);
  57. public@H_403_44@Cocos2dxGLSurfaceViewonCreateView(){
  58. return@H_403_44@new@H_403_44@Cocos2dxGLSurfaceView(this@H_403_44@);
  59. //InnerandAnonymousClasses@H_403_44@
  60. }

代码很多，呵呵。其实核心就是那个mGLSurfaceView和它的渲染器new Cocos2dxRenderer()。在Android上，OpenGL的渲染是由一个GLSurfaceView和其渲染器Render组成。GLSurfaceView显示界面，Render渲染更新。这个Render其实是一个渲染线程，不停再跑，由框架层维护。这里不多讲。

来看这个Cocos2dxRenderer

?
    package@H_403_44@org.cocos2dx.lib;
  1. import@H_403_44@javax.microedition.khronos.egl.EGLConfig;
  2. import@H_403_44@javax.microedition.khronos.opengles.GL10;
  3. import@H_403_44@android.opengl.GLSurfaceView;
  4. public@H_403_44@class@H_403_44@Cocos2dxRendererimplements@H_403_44@GLSurfaceView.Renderer{
  5. //Constants@H_403_44@
  6. private@H_403_44@final@H_403_44@static@H_403_44@long@H_403_44@NANOSECONDSPERSECOND=1000000000L;
  7. private@H_403_44@final@H_403_44@static@H_403_44@long@H_403_44@NANOSECONDSPERMICROSECOND=1000000@H_403_44@;
  8. private@H_403_44@static@H_403_44@long@H_403_44@sAnimationInterval=(long@H_403_44@)(1.0@H_403_44@/60@H_403_44@*Cocos2dxRenderer.NANOSECONDSPERSECOND);
  9. private@H_403_44@long@H_403_44@mLastTickInNanoSeconds;
  10. private@H_403_44@int@H_403_44@mScreenWidth;
  11. private@H_403_44@int@H_403_44@mScreenHeight;
  12. //Constructors@H_403_44@
  13. public@H_403_44@static@H_403_44@void@H_403_44@setAnimationInterval(final@H_403_44@double@H_403_44@pAnimationInterval){
  14. Cocos2dxRenderer.sAnimationInterval=(long@H_403_44@)(pAnimationInterval*Cocos2dxRenderer.NANOSECONDSPERSECOND);
  15. public@H_403_44@void@H_403_44@setScreenWidthAndHeight(final@H_403_44@int@H_403_44@pSurfaceWidth,final@H_403_44@int@H_403_44@pSurfaceHeight){
  16. this@H_403_44@.mScreenWidth=pSurfaceWidth;
  17. this@H_403_44@.mScreenHeight=pSurfaceHeight;
  18. //Methodsfor/fromSuperClass/Interfaces@H_403_44@
  19. @Override@H_403_44@//①注意这里@H_403_44@
  20. public@H_403_44@void@H_403_44@onSurfaceCreated(final@H_403_44@GL10pGL10,final@H_403_44@EGLConfigpEGLConfig){
  21. Cocos2dxRenderer.nativeInit(this@H_403_44@.mScreenWidth,this@H_403_44@.mScreenHeight);//②初始化窗口@H_403_44@
  22. this@H_403_44@.mLastTickInNanoSeconds=System.nanoTime();
  23. public@H_403_44@void@H_403_44@onSurfaceChanged(final@H_403_44@GL10pGL10,final@H_403_44@int@H_403_44@pWidth,final@H_403_44@int@H_403_44@pHeight){
  24. //③注意这里@H_403_44@
  25. public@H_403_44@void@H_403_44@onDrawFrame(final@H_403_44@GL10gl){
  26. /*
  27. *FPScontrollingalgorithmisnotaccurate,anditwillslowdownFPS
  28. *onsomedevices.SocommentFPScontrollingcode.
  29. */@H_403_44@
  30. /*
  31. finallongnowInNanoSeconds=System.nanoTime();
  32. finallonginterval=nowInNanoSeconds-this.mLastTickInNanoSeconds;
  33. */@H_403_44@
  34. //shouldrenderaframewhenonDrawFrame()iscalledorthereisa@H_403_44@
  35. //"ghost"@H_403_44@
  36. Cocos2dxRenderer.nativeRender();//④特别注意这个@H_403_44@
  37. //fpscontrolling
  38. if(interval<Cocos2dxRenderer.sAnimationInterval){
  39. try{
  40. //becausewerenderitbefore,soweshouldsleeptwicetimeinterval
  41. Thread.sleep((Cocos2dxRenderer.sAnimationInterval-interval)/Cocos2dxRenderer.NANOSECONDSPERMICROSECOND);
  42. }catch(finalExceptione){
  43. }
  44. }
  46. this.mLastTickInNanoSeconds=nowInNanoSeconds;
  47. //Methods@H_403_44@
  48. private@H_403_44@static@H_403_44@native@H_403_44@void@H_403_44@nativeTouchesBegin(final@H_403_44@int@H_403_44@pID,final@H_403_44@float@H_403_44@pX,final@H_403_44@float@H_403_44@pY);
  49. private@H_403_44@static@H_403_44@native@H_403_44@void@H_403_44@nativeTouchesEnd(final@H_403_44@int@H_403_44@pID,final@H_403_44@float@H_403_44@pY);
  50. private@H_403_44@static@H_403_44@native@H_403_44@void@H_403_44@nativeTouchesMove(final@H_403_44@int@H_403_44@[]pIDs,final@H_403_44@float@H_403_44@[]pXs,final@H_403_44@float@H_403_44@[]pYs);
  51. private@H_403_44@static@H_403_44@native@H_403_44@void@H_403_44@nativeTouchesCancel(final@H_403_44@int@H_403_44@[]pIDs,final@H_403_44@float@H_403_44@[]pYs);
  52. private@H_403_44@static@H_403_44@native@H_403_44@boolean@H_403_44@nativeKeyDown(final@H_403_44@int@H_403_44@pKeyCode);
  53. private@H_403_44@static@H_403_44@native@H_403_44@void@H_403_44@nativeRender();
  54. private@H_403_44@static@H_403_44@native@H_403_44@void@H_403_44@nativeInit(final@H_403_44@int@H_403_44@pWidth,final@H_403_44@int@H_403_44@pHeight);
  55. private@H_403_44@static@H_403_44@native@H_403_44@void@H_403_44@nativeOnPause();
  56. private@H_403_44@static@H_403_44@native@H_403_44@void@H_403_44@nativeOnResume();
  57. public@H_403_44@void@H_403_44@handleActionDown(final@H_403_44@int@H_403_44@pID,final@H_403_44@float@H_403_44@pY){
  58. Cocos2dxRenderer.nativeTouchesBegin(pID,pX,pY);
  59. public@H_403_44@void@H_403_44@handleActionUp(final@H_403_44@int@H_403_44@pID,153); list-style:decimal-leading-zero outside; color:inherit; line-height:20px; margin:0px!important; padding:0px 3px 0px 10px!important"> Cocos2dxRenderer.nativeTouchesEnd(pID,248)"> public@H_403_44@void@H_403_44@handleActionCancel(final@H_403_44@int@H_403_44@[]pIDs,final@H_403_44@float@H_403_44@[]pYs){
  60. Cocos2dxRenderer.nativeTouchesCancel(pIDs,pXs,pYs);
  61. public@H_403_44@void@H_403_44@handleActionMove(final@H_403_44@int@H_403_44@[]pIDs,153); list-style:decimal-leading-zero outside; color:inherit; line-height:20px; margin:0px!important; padding:0px 3px 0px 10px!important"> Cocos2dxRenderer.nativeTouchesMove(pIDs,248)"> public@H_403_44@void@H_403_44@handleKeyDown(final@H_403_44@int@H_403_44@pKeyCode){
  62. Cocos2dxRenderer.nativeKeyDown(pKeyCode);
  63. public@H_403_44@void@H_403_44@handleOnPause(){
  64. Cocos2dxRenderer.nativeOnPause();
  65. public@H_403_44@void@H_403_44@handleOnResume(){
  66. Cocos2dxRenderer.nativeOnResume();
  67. private@H_403_44@static@H_403_44@native@H_403_44@void@H_403_44@nativeInsertText(final@H_403_44@StringpText);
  68. private@H_403_44@static@H_403_44@native@H_403_44@void@H_403_44@nativeDeleteBackward();
  69. private@H_403_44@static@H_403_44@native@H_403_44@StringnativeGetContentText();
  70. public@H_403_44@void@H_403_44@handleInsertText(final@H_403_44@StringpText){
  71. Cocos2dxRenderer.nativeInsertText(pText);
  72. public@H_403_44@void@H_403_44@handleDeleteBackward(){
  73. Cocos2dxRenderer.nativeDeleteBackward();
  74. public@H_403_44@StringgetContentText(){
  75. return@H_403_44@Cocos2dxRenderer.nativeGetContentText();
  76. }

代码很多，一副貌似很复杂的样子。其实脉络很清晰的，我们只看脉络，不考虑细节哈。我们顺藤摸瓜来...

首先要知道GLSurfaceView的渲染器必须实现GLSurfaceView.Renderer接口。就是上面的三个Override方法。

onSurfaceCreated在窗口建立的时候调用，onSurfaceChanged在窗口建立和大小变化是调用，onDrawFrame这个方法就跟普通View的Ondraw方法一样，窗口建立初始化完成后渲染线程不停的调这个方法。这些都是框架决定的，就是这个样子。下面分析下代码几处标记的地方：

看标记①，窗口建立，这个时候要进行初始化。这个时候它调用了一个native函数，就是标记②。看到这个函数形式是不是能想到什么呢，等下再说。

看标记③，前面说了，这个函数会被渲染线程不停调用（像不像主循环的死循环啊）。然后里面有个很牛擦的函数④。

这又是一个native的函数，呵呵。

native的代码是神马啊，就是C++啊。知之为知之，不知谷歌之。

既然是java调用C++，那就是jni调用了。

我们来看看jni/hellocpp/下的main.cpp

?
    #include"AppDelegate.h"@H_403_44@
  1. #include"platform/android/jni/JniHelper.h"@H_403_44@
  2. #include<jni.h>@H_403_44@
  3. #include<android/log.h>@H_403_44@
  4. #include"HelloWorldScene.h"@H_403_44@
  5. #defineLOG_TAG"main"@H_403_44@
  6. #defineLOGD(...)__android_log_print(ANDROID_LOG_DEBUG,LOG_TAG,__VA_ARGS__)@H_403_44@
  7. using@H_403_44@namespace@H_403_44@cocos2d;
  8. extern@H_403_44@"C"@H_403_44@
  9. jintJNI_OnLoad(JavaVM*vm,void@H_403_44@*reserved)
  10. JniHelper::setJavaVM(vm);
  11. return@H_403_44@JNI_VERSION_1_4;
  12. void@H_403_44@Java_org_cocos2dx_lib_Cocos2dxRenderer_nativeInit(JNIEnv*env,jobjectthiz,jintw,jinth)
  13. if@H_403_44@(!CCDirector::sharedDirector()->getOpenGLView())
  14. CCEGLView*view=CCEGLView::sharedOpenGLView();
  15. view->setFrameSize(w,h);
  16. CCLog("with%d,height%d"@H_403_44@,w,h);
  17. AppDelegate*pAppDelegate=new@H_403_44@AppDelegate();
  18. CCApplication::sharedApplication()->run();//看这里⑤@H_403_44@
  19. else@H_403_44@
  20. ccDrawInit();
  21. ccGLInvalidateStateCache();
  22. CCShaderCache::sharedShaderCache()->reloadDefaultShaders();
  23. CCTextureCache::reloadAllTextures();
  24. CCNotificationCenter::sharedNotificationCenter()->postNotification(EVNET_COME_TO_FOREGROUND,NULL);
  25. CCDirector::sharedDirector()->setGLDefaultValues();
  26. }

根据Jni的命名规则，那个标注②的nativeInit方法就是上面红色一长串（呵呵）。窗口建立起来后调用nativeInit方法，就是调用这个C++的实现。这里做了窗口的初始化处理。

看标注⑤，你以为这个run函数就进入主循环了么，呵呵

看这个run

?
    @H_403_44@<spanstyle="font-size:18px;"@H_403_44@>//Initializeinstanceandcocos2d.@H_403_44@
  1. if@H_403_44@(!applicationDidFinishLaunching())
  2. return@H_403_44@0;
  3. return@H_403_44@-1;
  4. }</span>

我们看到了神马！实质上就调了一下applicationDidFinishLaunching，别的什么也没干。所以这里没有进入主循环。

现在再看③和④。这个逻辑貌似就是主循环。

这个nativeRender()函数的实现在Yourcocos2dDir/cocos2dx/platform/android/jni/Java_org_cocos2dx_lib_Cocos2dxRenderer.cpp

?
    #include"text_input_node/CCIMEDispatcher.h"@H_403_44@
  1. #include"CCDirector.h"@H_403_44@
  2. #include"../CCApplication.h"@H_403_44@
  3. #include"platform/CCFileUtils.h"@H_403_44@
  4. #include"CCEventType.h"@H_403_44@
  5. #include"support/CCNotificationCenter.h"@H_403_44@
  6. #include"JniHelper.h"@H_403_44@
  7. #include<jni.h>@H_403_44@
  8. using@H_403_44@namespace@H_403_44@cocos2d;
  9. extern@H_403_44@"C"@H_403_44@{
  10. JNIEXPORTvoid@H_403_44@JNICALLJava_org_cocos2dx_lib_<spanstyle="color:#ff0000;"@H_403_44@>Cocos2dxRenderer_nativeRender</span>(JNIEnv*env){
  11. <spanstyle="color:#ff0000;"@H_403_44@>cocos2d::CCDirector::sharedDirector()->mainLoop();//看到木有，这是什么</span>@H_403_44@
  12. JNIEXPORTvoid@H_403_44@JNICALLJava_org_cocos2dx_lib_Cocos2dxRenderer_nativeOnPause(){
  13. CCApplication::sharedApplication()->applicationDidEnterBackground();
  14. CCNotificationCenter::sharedNotificationCenter()->postNotification(EVENT_COME_TO_BACKGROUND,NULL);
  15. JNIEXPORTvoid@H_403_44@JNICALLJava_org_cocos2dx_lib_Cocos2dxRenderer_nativeOnResume(){
  16. if@H_403_44@(CCDirector::sharedDirector()->getOpenGLView()){
  17. CCApplication::sharedApplication()->applicationWillEnterForeground();
  18. JNIEXPORTvoid@H_403_44@JNICALLJava_org_cocos2dx_lib_Cocos2dxRenderer_nativeInsertText(JNIEnv*env,jstringtext){
  19. const@H_403_44@char@H_403_44@*pszText=env->GetStringUTFChars(text,NULL);
  20. cocos2d::CCIMEDispatcher::sharedDispatcher()->dispatchInsertText(pszText,strlen(pszText));
  21. env->ReleaseStringUTFChars(text,pszText);
  22. JNIEXPORTvoid@H_403_44@JNICALLJava_org_cocos2dx_lib_Cocos2dxRenderer_nativeDeleteBackward(JNIEnv*env,jobjectthiz){
  23. cocos2d::CCIMEDispatcher::sharedDispatcher()->dispatchDeleteBackward();
  24. JNIEXPORTjstringJNICALLJava_org_cocos2dx_lib_Cocos2dxRenderer_nativeGetContentText(){
  25. JNIEnv*env=0;
  26. if@H_403_44@(JniHelper::getJavaVM()->GetEnv((void@H_403_44@**)&env,JNI_VERSION_1_4)!=JNI_OK||!env){
  27. const@H_403_44@char@H_403_44@*pszText=cocos2d::CCIMEDispatcher::sharedDispatcher()->getContentText();
  28. return@H_403_44@env->NewStringUTF(pszText);
  29. }

看上面标注，找到导演了，导演又开始主循环了。真是众里寻他千百度，那人却在灯火阑珊处啊。

到这里可以发现，Android上的主循环跟win上的不太一样，它不是一个简单的while就完了。它是由java的渲染线程发起的，通过不断调用render来驱动。


3.iOs

ios上面和Android上类似。看AppController.mm

?
    #import<UIKit/UIKit.h>@H_403_44@
  1. #import"AppController.h"@H_403_44@
  2. #import"cocos2d.h"@H_403_44@
  3. #import"EAGLView.h"@H_403_44@
  4. #import"AppDelegate.h"@H_403_44@
  5. #import"RootViewController.h"@H_403_44@
  6. @implementationAppController
  7. @synthesizewindow;
  8. @synthesizeviewController;
  9. #pragmamark-@H_403_44@
  10. #pragmamarkApplicationlifecycle@H_403_44@
  11. //cocos2dapplicationinstance@H_403_44@
  12. static@H_403_44@AppDelegates_sharedApplication;
  13. -(BOOL@H_403_44@)application:(UIApplication*)applicationdidFinishLaunchingWithOptions:(NSDictionary*)launchOptions{
  14. //Overridepointforcustomizationafterapplicationlaunch.@H_403_44@
  15. //Addtheviewcontroller'sviewtothewindowanddisplay.@H_403_44@
  16. window=[[UIWindowalloc]initWithFrame:[[UIScreenmainScreen]bounds]];
  17. EAGLView*__glView=[EAGLViewviewWithFrame:[windowbounds]
  18. pixelFormat:kEAGLColorFormatRGBA8
  19. depthFormat:GL_DEPTH_COMPONENT16
  20. preserveBackbuffer:NO
  21. sharegroup:nil
  22. multiSampling:NO
  23. numberOfSamples:0];
  24. //UseRootViewControllermanageEAGLView@H_403_44@
  25. viewController=[[RootViewControlleralloc]initWithNibName:nilbundle:nil];
  26. viewController.wantsFullScreenLayout=YES;
  27. viewController.view=__glView;
  28. //SetRootViewControllertowindow@H_403_44@
  29. if@H_403_44@([[UIDevicecurrentDevice].systemVersionfloatValue]<6.0)
  30. //warning:addSubViewdoesn'tworkoniOS6@H_403_44@
  31. [windowaddSubview:viewController.view];
  32. //usethismethodonios6@H_403_44@
  33. [windowsetRootViewController:viewController];
  34. [windowmakeKeyAndVisible];
  35. [[UIApplicationsharedApplication]setStatusBarHidden:YES];
  36. <spanstyle="color:#ff0000;"@H_403_44@>cocos2d::CCApplication::sharedApplication()->run();</span>//<spanstyle="color:#ff0000;">看这里</span>@H_403_44@
  37. return@H_403_44@YES;
  38. -(void@H_403_44@)applicationWillResignActive:(UIApplication*)application{
  39. Sentwhentheapplicationisabouttomovefromactivetoinactivestate.Thiscanoccurforcertaintypesoftemporaryinterruptions(suchasanincomingphonecallorSMSmessage)orwhentheuserquitstheapplicationanditbeginsthetransitiontothebackgroundstate.
  40. UsethismethodtopauSEOngoingtasks,disabletimers,andthrottledownOpenGLESframerates.Gamesshouldusethismethodtopausethegame.
  41. cocos2d::CCDirector::sharedDirector()->pause();
  42. -(void@H_403_44@)applicationDidBecomeActive:(UIApplication*)application{
  43. Restartanytasksthatwerepaused(ornotyetstarted)whiletheapplicationwasinactive.IftheapplicationwasprevIoUslyinthebackground,optionallyrefreshtheuserinterface.
  44. cocos2d::CCDirector::sharedDirector()->resume();
  45. -(void@H_403_44@)applicationDidEnterBackground:(UIApplication*)application{
  46. Usethismethodtoreleasesharedresources,saveuserdata,invalidatetimers,andstoreenoughapplicationstateinformationtorestoreyourapplicationtoitscurrentstateincaseitisterminatedlater.
  47. Ifyourapplicationsupportsbackgroundexecution,calledinsteadofapplicationWillTerminate:whentheuserquits.
  48. cocos2d::CCApplication::sharedApplication()->applicationDidEnterBackground();
  49. -(void@H_403_44@)applicationWillEnterForeground:(UIApplication*)application{
  50. Calledaspartoftransitionfromthebackgroundtotheinactivestate:hereyoucanundomanyofthechangesmadeonenteringthebackground.
  51. cocos2d::CCApplication::sharedApplication()->applicationWillEnterForeground();
  52. -(void@H_403_44@)applicationWillTerminate:(UIApplication*)application{
  53. Calledwhentheapplicationisabouttoterminate.
  54. SeealsoapplicationDidEnterBackground:.
  55. #pragmamark-@H_403_44@
  56. #pragmamarkMemorymanagement@H_403_44@
  57. -(void@H_403_44@)applicationDidReceiveMemoryWarning:(UIApplication*)application{
  58. Freeupasmuchmemoryaspossiblebypurgingcacheddataobjectsthatcanberecreated(orreloadedfromdisk)later.
  59. cocos2d::CCDirector::sharedDirector()->purgeCachedData();
  60. -(void@H_403_44@)dealloc{
  61. [superdealloc];
  62. @end

直接看标注，跟进run()

?
    if@H_403_44@(applicationDidFinishLaunching())
  1. <spanstyle="color:#ff0000;"@H_403_44@>[[CCDirectorCallersharedDirectorCaller]startMainLoop]</span>;
  2. }</span>
再跟标注的startMainLoop()

?
    @H_403_44@-(void@H_403_44@)startMainLoop
  1. //CCDirector::setAnimationInterval()iscalled,weshouldinvalidateitfirst@H_403_44@
  2. [displayLinkinvalidate];
  3. displayLink=nil;
  4. NSLog(@"runloop!"@H_403_44@);
  5. displayLink=[NSClassFromString(@"CADisplayLink"@H_403_44@)displayLinkWithTarget:selfselector:@selector(doCaller:)];//看这里@H_403_44@
  6. [displayLinksetFrameInterval:self.interval];
  7. [displayLinkaddToRunLoop:[NSRunLoopcurrentRunLoop]forMode:NSDefaultRunLoopMode];
  8. }
好了，看红色标注。这个貌似循环不起来啊，呵呵。

仔细看他加载的这个类CADisplayLink,就是这个东西循环起来的。这其实就是个定时器，默认每秒运行60次，其有个属性可以设置FPS。看后面有个回调函数doCaller，跟进

?
    @H_403_44@-(void@H_403_44@)doCaller:(id)sender
  1. cocos2d::CCDirector::sharedDirector()->mainLoop(); }
好了，终于又看到导演了。导演很忙，又开始主循环了。


一旦进入主循环，游戏就开始我们自己设计的游戏逻辑。

打字打的睡着了....不打了

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