Cocox2d-x 2.2.5 中 程序启动流程 及 Size 的设置

概述首先从main.m开始， int main(int argc, char *argv[]) { NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; int retVal = UIApplicationMain(argc, argv, nil, <strong>@"AppController"</stro

首先从main.m开始，

int main(int argc,char *argv[]) {        NSautoreleasePool * pool = [[NSautoreleasePool alloc] init];    int retVal = UIApplicationMain(argc,argv,nil,<strong>@"AppController"</strong>);    [pool release];    return retVal;}

程序进入AppController，AppController继承自NSObject，并遵循UIApplicationDelegate协议

@interface AppController :<strong> NSObject</strong> <UIApplicationDelegate> {    UIWindow *window;    RootVIEwController    *vIEwController;}

AppController中开头创建了一个AppDelegate对象，

//创建一个AppDelegate对象<strong>static AppDelegate s_sharedApplication;</strong>

AppDelegate对象的定义如下，AppDelegate继承自CCApplication：

class  AppDelegate : private cocos2d::CCApplication{public:    AppDelegate();    virtual ~AppDelegate();    virtual bool applicationDIDFinishLaunching();    virtual voID applicationDIDEnterBackground();    virtual voID applicationWillEnterForeground();};AppDelegate::AppDelegate() {}AppDelegate::~AppDelegate() {}／／／／／／／／／／／／／／／／／／／／／／／／／／／／／／／／／／／／／／／／／／／／／／／／／／／／／class CC_DLL CCApplication : public CCApplicationProtocol{public:    CCApplication();    virtual ~CCApplication();    static CCApplication* sharedApplication();protected:    static CCApplication * sm_pSharedApplication;};CCApplication* CCApplication::sm_pSharedApplication = 0;CCApplication::CCApplication(){    CC_ASSERT(! sm_pSharedApplication);    sm_pSharedApplication = this;}

下面是AppController的实现：

- (BOol)application:(UIApplication *)application dIDFinishLaunchingWithOptions:(NSDictionary *)launchOptions {        // 窗口    window = [[UIWindow alloc] initWithFrame: [[UIScreen mainScreen] bounds]];        // 创建EAGLVIEw EAGLVIEw主要负责创建程序在呈现屏幕图像时将会用到的OpenGL语境。    <strong>EAGLVIEw *__glVIEw = [EAGLVIEw vIEwWithFrame: [window bounds]                                     pixelFormat: kEAGLcolorFormatRGB565                                     depthFormat: GL_DEPTH24_STENCIL8_OES                              preserveBackbuffer: NO                                      sharegroup: nil                                   multiSampling: NO                                 numberOfSamples: 0];</strong>    // Use RootVIEwController manage EAGLVIEw     vIEwController = [[RootVIEwController alloc] initWithNibname:nil bundle:nil];    vIEwController.wantsFullScreenLayout = YES;    vIEwController.vIEw = __glVIEw;    if ( [[UIDevice currentDevice].systemVersion floatValue] < 6.0)    {        [window addSubvIEw: vIEwController.vIEw];    }    else    {        [window setRootVIEwController:vIEwController];    }        [window makeKeyAndVisible];        [[UIApplication sharedApplication] setStatusbarHIDden:true];       <strong> cocos2d::CCApplication::sharedApplication()->run();</strong>    return YES;}- (voID)applicationWillResignActive:(UIApplication *)application {    cocos2d::CCDirector::sharedDirector()->pause();}- (voID)applicationDIDBecomeActive:(UIApplication *)application {    cocos2d::CCDirector::sharedDirector()->resume();}- (voID)applicationDIDEnterBackground:(UIApplication *)application {    cocos2d::CCApplication::sharedApplication()->applicationDIDEnterBackground();}- (voID)applicationWillEnterForeground:(UIApplication *)application {    cocos2d::CCApplication::sharedApplication()->applicationWillEnterForeground();}

程序一开始就创建了一个EAGLVIEw的对象__glVIEw，__glVIEw的frame被设置成［window bounds］,EAGLVIEw中定义了一个静态对象 static EAGLVIEw *vIEw=0,可以通过单例方法sharedEGLVIEw获取，获取__glVIEw可以通过调用[EgalVIEw sharedVIEw]得到。__glVIEw创建完之后将其用作RootVIEwController的VIEw，再添加到程序的window上。接下来通过语句：cocos2d::CCApplication::sharedApplicaiton()->run()让游戏跑起来;先来看看CCApplicaiton的run()函数的定义：

int CCApplication::run(){    if (<strong>applicationDIDFinishLaunching()</strong>)     {       <strong> [[CCDirectorCaller sharedDirectorCaller] startMainLoop];</strong>    }    return 0;}

先执行applicaitonDIDFinishLaunching()函数，其定义如下：

bool AppDelegate::applicationDIDFinishLaunching(){    CCConfiguration::sharedConfiguration()->loadConfigfile("configs/config-example.pList");    // initialize director    CCDirector *pDirector = CCDirector::sharedDirector();   <strong> pDirector->setopenGLVIEw(CCEGLVIEw::sharedOpenGLVIEw());</strong>    pDirector->setdisplayStats(true);   <strong> CCSize screenSize = CCEGLVIEw::sharedOpenGLVIEw()->getFrameSize();    CCSize designSize = CCSizeMake(480,320);</strong>#if (CC_TARGET_PLATFORM == CC_PLATFORM_WINRT) || (CC_TARGET_PLATFORM == CC_PLATFORM_WP8)    CCEGLVIEw::sharedOpenGLVIEw()->setDesignResolutionSize(designSize.wIDth,designSize.height,kResolutionShowAll);#else   <strong> CCEGLVIEw::sharedOpenGLVIEw()->setDesignResolutionSize(designSize.wIDth,kResolutionNoborder);</strong>#endif    CCScene * pScene = CCScene::create();    cclayer * pLayer = new TestController();    pLayer->autorelease();    pScene->addChild(pLayer);    pDirector->runWithScene(pScene);       return true;}

在applicationDIDFinishLaunching()里先创建了一个CCDirector对象,然后设置其OpenGLVIEw为单例CCEGLVIEw::sharedOpenGLVIEw(),

CCEGLVIEw* CCEGLVIEw::sharedOpenGLVIEw(){    static CCEGLVIEw instance;    return &instance;}

CCEGLVIEw::CCEGLVIEw(){     //这里使用参数对两个变量进行了赋值，第一个就是屏幕的大小。第二个就是分辨率大小。    m_obScreenSize.wIDth = m_obDesignResolutionSize.wIDth = [[EAGLVIEw sharedEGLVIEw] getWIDth];    m_obScreenSize.height = m_obDesignResolutionSize.height = [[EAGLVIEw sharedEGLVIEw] getHeight];}

在创建CCEGLVIEw的对象时会用 EgalVIEw 的宽高去初始化其屏幕尺寸m_obScreeenSize和分辨率大小m_obDesignResolutionSize。我们回到Application的run(),在applicationDIDFinishLaunching执行完返回true，程序会执行[[CCDirectorCaller sharedDirectorCaller] startMainLoop];

-(voID) startMainLoop{        // CCDirector::setAnimationInterval() is called,we should invalIDate it first        [displaylink invalIDate];        displaylink = nil;        displaylink = [NSClassFromString(@"CAdisplaylink") displaylinkWithTarget:self selector:@selector(doCaller:)];        [displaylink setFrameInterval: self.interval];        [displaylink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];}-(voID) doCaller: (ID) sender{    [EAGLContext setCurrentContext: [[EAGLVIEw sharedEGLVIEw] context]];    cocos2d::CCDirector::sharedDirector()->mainLoop();}

displaylink是一个CAdisplaylink对象，是一个定时器，这里会不断调用doCaller，doCaller里会不断调用CCDirector的mainLoop(). 总结

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