cocos2dx 2.1.4 程序运行脉络解析2—解析CCDirector

依据cocos2dx 2.1.4 程序运行脉络解析-1分析的代码，在程序run之后会调用applicationDidFinishLaunching函数进行相关初始化，依据cocos2dx helloCpp代码如下：

bool AppDelegate::applicationDidFinishLaunching() { // initialize director CCDirector* pDirector = CCDirector::sharedDirector();//初始化director CCEGLView* pEGLView = CCEGLView::sharedOpenGLView();// Set the design resolutionpEGLView->setDesignResolutionSize(designResolutionSize.width, designResolutionSize.height, kResolutionNoBorder); pDirector->setOpenGLView(pEGLView);CCSize frameSize = pEGLView->getFrameSize(); vector<string> searchPath; // In this demo, we select resource according to the frame's height. // If the resource size is different from design resolution size, you need to set contentScaleFactor. // We use the ratio of resource's height to the height of design resolution, // this can make sure that the resource's height could fit for the height of design resolution. // if the frame's height is larger than the height of medium resource size, select large resource.if (frameSize.height > mediumResource.size.height){ searchPath.push_back(largeResource.directory); pDirector->setContentScaleFactor(MIN(largeResource.size.height/designResolutionSize.height, largeResource.size.width/designResolutionSize.width));} // if the frame's height is larger than the height of small resource size, select medium resource. else if (frameSize.height > smallResource.size.height) { searchPath.push_back(mediumResource.directory); pDirector->setContentScaleFactor(MIN(mediumResource.size.height/designResolutionSize.height, mediumResource.size.width/designResolutionSize.width)); } // if the frame's height is smaller than the height of medium resource size, select small resource.else { searchPath.push_back(smallResource.directory); pDirector->setContentScaleFactor(MIN(smallResource.size.height/designResolutionSize.height, smallResource.size.width/designResolutionSize.width)); } // set searching path CCFileUtils::sharedFileUtils()->setSearchPaths(searchPath); // turn on display FPS pDirector->setDisplayStats(true); // set FPS. the default value is 1.0/60 if you don't call this pDirector->setAnimationInterval(1.0 / 60); // create a scene. it's an autorelease object CCScene *pScene = CCScene::create(); // run pDirector->runWithScene(pScene); return true;}</string>

程序初始化CCDirector 再将CCEGLView关联到CCDirector 中去来完成初始化：

bool CCDirector::init(void){//根据配置表（CCConfiguration）的设置设置默认的//1.fps,的设置,如果配置表没有则设置默认值：60//2.投影的设置,如果配置表没有则设置默认值：kCCDirectorProjection3D//3.CCTexture2D::setDefaultAlphaPixelFormat的设置 （默认：kCCTexture2DPixelFormat_RGBA8888）//4.CCTexture2D::PVRImagesHavePremultipliedAlpha的设置（默认：false）setDefaultValues(); // scenes m_pRunningScene = NULL; m_pNextScene = NULL; m_pNotificationNode = NULL; m_pobScenesStack = new CCArray(); m_pobScenesStack->init(); // projection delegate if "Custom" projection is used m_pProjectionDelegate = NULL; // FPS m_fAccumDt = 0.0f; m_fFrameRate = 0.0f; m_pFPSLabel = NULL; m_pSPFLabel = NULL; m_pDrawsLabel = NULL; m_uTotalFrames = m_uFrames = 0; m_pszFPS = new char[10]; m_pLastUpdate = new struct cc_timeval(); // paused ? m_bPaused = false; // purge ? m_bPurgeDirecotorInNextLoop = false; m_obWinSizeInPoints = CCSizeZero; m_pobOpenGLView = NULL; m_fContentScaleFactor = 1.0f; // scheduler m_pScheduler = new CCScheduler(); // action manager m_pActionManager = new CCActionManager();//为actionManager计时 m_pScheduler->scheduleUpdateForTarget(m_pActionManager, kCCPrioritySystem, false); // touchDispatcher m_pTouchDispatcher = new CCTouchDispatcher(); m_pTouchDispatcher->init(); // KeypadDispatcher m_pKeypadDispatcher = new CCKeypadDispatcher(); // Accelerometer m_pAccelerometer = new CCAccelerometer(); // create autorelease pool CCPoolManager::sharedPoolManager()->push(); return true;}void CCDirector::setOpenGLView(CCEGLView *pobOpenGLView){ CCAssert(pobOpenGLView, "opengl view should not be null"); if (m_pobOpenGLView != pobOpenGLView) {// Configuration. Gather GPU infoCCConfiguration *conf = CCConfiguration::sharedConfiguration();conf->gatherGPUInfo();//此处打印config的所有信息到控制台conf->dumpInfo(); // EAGLView is not a CCObject delete m_pobOpenGLView; // [openGLView_ release] m_pobOpenGLView = pobOpenGLView; // set size m_obWinSizeInPoints = m_pobOpenGLView->getDesignResolutionSize(); //创建示例程序左下角的label createStatsLabel(); if (m_pobOpenGLView) {//1.设置启用alpha混合//2.禁用深度测试//3.设置投影//4.背景清空为黑色alpha 为1.0 setGLDefaultValues(); } CHECK_GL_ERROR_DEBUG();//将内部的touchDispatcher交给m_pobOpenGLView，负责产生touch消息 m_pobOpenGLView->setTouchDelegate(m_pTouchDispatcher); m_pTouchDispatcher->setDispatchEvents(true); }}

在初始化完director后程序设置了下屏幕的长宽缩放比率（现在对这方面有着很模糊的印象，为此我想用单独的一篇博客研究讨论屏幕大小调整的问题），和设置其它属性，

CCApplication 在run循环中会不停的调用director的 mainLoop方法：

void CCDisplayLinkDirector::mainLoop(void){ if (m_bPurgeDirecotorInNextLoop) { m_bPurgeDirecotorInNextLoop = false; purgeDirector(); } else if (! m_bInvalid) { drawScene(); //每一帧都释放autoReleasePool中的Object // release the objects CCPoolManager::sharedPoolManager()->pop(); }}

程序到这里我感觉不得不将director整体的分析一遍了：一下是结果（我依据功能来划分，将其内部变量与函数的位置进行了调整，感觉这样会更清楚易读~）

#ifndef __CCDIRECTOR_H__#define __CCDIRECTOR_H__#include "platform/CCPlatformMacros.h"#include "cocoa/CCObject.h"#include "ccTypes.h"#include "cocoa/CCGeometry.h"#include "cocoa/CCArray.h"#include "CCGL.h"#include "kazmath/mat4.h"#include "label_nodes/CCLabelAtlas.h"#include "ccTypeInfo.h"NS_CC_BEGIN/** * @addtogroup base_nodes * @{ *//** @typedef ccDirectorProjection Possible OpenGL projections used by director */typedef enum {//2d正交投影 /// sets a 2D projection (orthogonal projection) kCCDirectorProjection2D, //3d透视投影 /// sets a 3D projection with a fovy=60, znear=0.5f and zfar=1500. kCCDirectorProjection3D, /// it calls "updateProjection" on the projection delegate. kCCDirectorProjectionCustom, /// Default projection is 3D projection kCCDirectorProjectionDefault = kCCDirectorProjection3D,} ccDirectorProjection;/* Forward declarations. */class CCLabelAtlas;//显示左下角的FPS等信息class CCScene;//场景class CCEGLView;//视区class CCDirectorDelegate;//OpenGL projection protocolclass CCNode;//节点class CCScheduler;//计时管理class CCActionManager;//动画管理class CCTouchDispatcher;//触摸事件分发器class CCKeypadDispatcher;//按键事件分发器class CCAccelerometer;//重力感应事件分发器class CC_DLL CCDirector : public CCObject, public TypeInfo{//先解析director的数据结构，总体上了解其架构protected://依据功能来对director的数据结构进行划分/**1.cocos2dx底层机制的实现：scheduler、actionManager、touchDispatcher、keyPadDispatcher、accelerometer*/ CC_PROPERTY(CCScheduler*, m_pScheduler, Scheduler);//CCScheduler associated with this director CC_PROPERTY(CCActionManager*, m_pActionManager, ActionManager);//CCActionManager associated with this director CC_PROPERTY(CCTouchDispatcher*, m_pTouchDispatcher, TouchDispatcher);//CCTouchDispatcher associated with this director CC_PROPERTY(CCKeypadDispatcher*, m_pKeypadDispatcher, KeypadDispatcher);//CCKeypadDispatcher associated with this director CC_PROPERTY(CCAccelerometer*, m_pAccelerometer, Accelerometer);//CCAccelerometer associated with this director/**2.EGLView属性相关，与opengl相关体系打交道的数据结构*/ CCEGLView*m_pobOpenGLView;//The CCEGLView, where everything is renderedccDirectorProjectionm_eProjection;//使用的投影矩阵CCDirectorDelegate*m_pProjectionDelegate;//设置自定义的投影矩阵：对应 kCCDirectorProjectionCustom需要实现CCDirectorDelegate的 方法来自定义pro view matrixCCSizem_obWinSizeInPoints;//window size in pointsfloatm_fContentScaleFactor;//content scale factorfriend class CCEGLViewProtocol;// CCEGLViewProtocol will recreate stats labels to fit visible rect// /* landscape mode ? */// bool m_bLandscape;//这个模式暂时不支持忽略/**3.场景渲染,节点访问体系相关数据结构*/CCScene*m_pRunningScene;//The running sceneCCScene*m_pNextScene;//will be the next 'runningScene' in the next frame nextScene is a weak reference.boolm_bSendCleanupToScene;//If YES, then "old" scene will receive the cleanup messageCCArray*m_pobScenesStack;//scheduled scenesCCNode *m_pNotificationNode;//This object will be visited after the scene. Useful to hook a notification node,This object MUST implement the "visit" selector./**4.帧间隔相关数据结构*/CC_PROPERTY_READONLY(float, m_fDeltaTime, DeltaTime);//每一个mainLoop循环之间的时间间隔 double m_dAnimationInterval; double m_dOldAnimationInterval;bool m_bPaused;//Whether or not the Director is paused bool m_bDisplayStats;//是否显示左下角label float m_fAccumDt;//累计时间 float m_fFrameRate;//显示左下角的label，改用显示图片了 CCLabelAtlas *m_pFPSLabel;//frame per second CCLabelAtlas *m_pSPFLabel;//second per frame CCLabelAtlas *m_pDrawsLabel;//当前running scene下子节点中的进行绘制的节点数量 /* How many frames were called since the director started */ unsigned int m_uTotalFrames; unsigned int m_uFrames; float m_fSecondsPerFrame;char *m_pszFPS;//store the fps stringstruct cc_timeval*m_pLastUpdate;//last time the main loop was updatedboolm_bNextDeltaTimeZero;//whether or not the next delta time will be zeropublic: CCDirector(void); virtual ~CCDirector(void);//初始化1//初始化内部成员外还初始化了 autorelease pool virtual bool init(void);/**TypeInfo实现，感觉没实际地方能够用到该功能，而且typeid是不夸平台的，它生成的字符串在不同编译器上产生的结果是不同的,至少win32与android是不同的（我遇见过类似可恶的问题，纠结了好久才找到其原因）*/ virtual long getClassTypeInfo() {static const long id = cocos2d::getHashCodeByString(typeid(cocos2d::CCDirector).name());return id; } //以下函数见名知意无需纠结 inline CCScene*getRunningScene(void) { return m_pRunningScene; } inline doublegetAnimationInterval(void) { return m_dAnimationInterval; } virtual voidsetAnimationInterval(double dValue) = 0; inline boolisDisplayStats(void) { return m_bDisplayStats; } inline voidsetDisplayStats(bool bDisplayStats) { m_bDisplayStats = bDisplayStats; } inline floatgetSecondsPerFrame() { return m_fSecondsPerFrame; }inline boolisNextDeltaTimeZero(void) { return m_bNextDeltaTimeZero; }voidsetNextDeltaTimeZero(bool bNextDeltaTimeZero);inline boolisPaused(void) { return m_bPaused; }inline unsigned int getTotalFrames(void) { return m_uTotalFrames; }CCNode*getNotificationNode();voidsetNotificationNode(CCNode *node);CCDirectorDelegate*getDelegate() const;voidsetDelegate(CCDirectorDelegate* pDelegate);//需要分析的函数： /** Get the CCEGLView, where everything is rendered 关联eglView,关联后对opengl进行相关初始化当调用设置了CCEGLView后CCEGLView不要再设置改变resolution了，不然会与director存储的resolution不匹配*/ inline CCEGLView*getOpenGLView(void) { return m_pobOpenGLView; }//初始化2，设置view后保存逻辑尺寸的width与height设置 voidsetOpenGLView(CCEGLView *pobOpenGLView); /** Sets an OpenGL projection 设置投影矩阵与对应的 view transform matrix 如果设置的是kCCDirectorProjectionCustom，则需要根据m_pProjectionDelegate来设置自定义的投影 （打算关于矩阵转换操作在另外一个单独模块单独分析） */ inline ccDirectorProjection getProjection(void) { return m_eProjection; } void setProjection(ccDirectorProjection kProjection); //屏幕显示尺寸比例相关(稍后详细剖析)void setViewport();//设置glViewPortCCSize getWinSize(void);CCSize getWinSizeInPixels(void);//里面涉及到的m_fContentScaleFactor，程序设置此值控制显示区域的比例大小//直接获取eglView的属性CCSize getVisibleSize();CCPoint getVisibleOrigin();/** The size in pixels of the surface. It could be different than the screen size. High-res devices might have a higher surface size than the screen size. Only available when compiled using SDK >= 4.0. @since v0.99.4 */ void setContentScaleFactor(float scaleFactor); float getContentScaleFactor(void);/**UI坐标（左上角为原点）与GL坐标（左下角为原点）*/ /** converts a UIKit coordinate to an OpenGL coordinate Useful to convert (multi) touch coordinates to the current layout (portrait or landscape) */ CCPoint convertToGL(const CCPoint& obPoint); /** converts an OpenGL coordinate to a UIKit coordinate Useful to convert node points to window points for calls such as glScissor */ CCPoint convertToUI(const CCPoint& obPoint); float getZEye(void); // Scene Management/**2dx内部管理了一个scene Stack 可以向stack中执行push 与pop scene操作，当scene被移除的时候会接收cleanup事件来移除scene子节点的action 与 scheduler，场景之间的切换支持CCTransitionScene转换*/ /** Whether or not the replaced scene will receive the cleanup message. If the new scene is pushed, then the old scene won't receive the "cleanup" message. If the new scene replaces the old one, the it will receive the "cleanup" message. 告诉是否即将有一个场景将从director中剔除并执行cleanUp暂停actions 与 schedulers */inline bool isSendCleanupToScene(void) { return m_bSendCleanupToScene; } /** Enters the Director's main loop with the given Scene. * Call it to run only your FIRST scene. * Don't call it if there is already a running scene. * * It will call pushScene: and then it will call startAnimation */ void runWithScene(CCScene *pScene); /** Suspends the execution of the running scene, pushing it on the stack of suspended scenes. * The new scene will be executed. * Try to avoid big stacks of pushed scenes to reduce memory allocation. * ONLY call it if there is a running scene. */ void pushScene(CCScene *pScene); /** Pops out a scene from the queue. * This scene will replace the running one. * The running scene will be deleted. If there are no more scenes in the stack the execution is terminated. * ONLY call it if there is a running scene. */ void popScene(void); /** Pops out all scenes from the queue until the root scene in the queue. * This scene will replace the running one. * Internally it will call `popToSceneStackLevel(1)` */ void popToRootScene(void); /** Pops out all scenes from the queue until it reaches `level`. If level is 0, it will end the director. If level is 1, it will pop all scenes until it reaches to root scene. If level is <= than the current stack level, it won't do anything. */ void popToSceneStackLevel(int level); /** Replaces the running scene with a new one. The running scene is terminated. * ONLY call it if there is a running scene. */ void replaceScene(CCScene *pScene); /** Ends the execution, releases the running scene. It doesn't remove the OpenGL view from its parent. You have to do it manually. */ void end(void); /** Pauses the running scene. The running scene will be _drawed_ but all scheduled timers will be paused While paused, the draw rate will be 4 FPS to reduce CPU consumption 停止计时器计时 */ void pause(void); /** Resumes the paused scene The scheduled timers will be activated again. The "delta time" will be 0 (as if the game wasn't paused) 恢复计时器计时 */ void resume(void); /** Stops the animation. Nothing will be drawn. The main loop won't be triggered anymore. If you don't want to pause your animation call [pause] instead. */ virtual void stopAnimation(void) = 0; /** The main loop is triggered again. Call this function only if [stopAnimation] was called earlier @warning Don't call this function to start the main loop. To run the main loop call runWithScene */ virtual void startAnimation(void) = 0; /** Draw the scene. This method is called every frame. Don't call it manually.绘制场景的函数，每帧调用，执行 更新计时器，场景切换，visit Notification Node，等操作 */ void drawScene(void); // Memory Helper /** Removes cached all cocos2d cached data. It will purge the CCTextureCache, CCSpriteFrameCache, CCLabelBMFont cache 注：我查看代码CCSpriteFrameCache是不会被移除的，对于资源的管理感觉太依赖2dx那是不可能的， 还是需要自己写功能维护资源内存相关的管理，so 还是最好别用这个可恶的函数 */ void purgeCachedData(void);/** sets the default values based on the CCConfiguration info */ void setDefaultValues(void); // OpenGL Helper /** sets the OpenGL default values */ void setGLDefaultValues(void); /** enables/disables OpenGL alpha blending */ void setAlphaBlending(bool bOn); /** enables/disables OpenGL depth test */ void setDepthTest(bool bOn); virtual void mainLoop(void) = 0;public:public: /** returns a shared instance of the director */ static CCDirector* sharedDirector(void);protected: void purgeDirector(); bool m_bPurgeDirecotorInNextLoop; // this flag will be set to true in end() void setNextScene(void); void showStats(); void createStatsLabel(); void calculateMPF(); void getFPSImageData(unsigned char** datapointer, unsigned int* length); /** calculates delta time since last time it was called */ void calculateDeltaTime();};/** @brief DisplayLinkDirector is a Director that synchronizes timers with the refresh rate of the display. Features and Limitations: - Scheduled timers & drawing are synchronizes with the refresh rate of the display - Only supports animation intervals of 1/60 1/30 & 1/15 @since v0.8.2 */class CCDisplayLinkDirector : public CCDirector{public: CCDisplayLinkDirector(void) : m_bInvalid(false) {}/**每一帧中调用drawScene方法并且释放放入autoreleasePool中的object*/ virtual void mainLoop(void); virtual void setAnimationInterval(double dValue); virtual void startAnimation(void);//通过application真正地控制帧频率 virtual void stopAnimation();protected: bool m_bInvalid;};// end of base_node group/// @}NS_CC_END#endif // __CCDIRECTOR_H__// Draw the Scenevoid CCDirector::drawScene(void){ // calculate "global" dt calculateDeltaTime(); //tick before glClear: issue #533 if (! m_bPaused) { m_pScheduler->update(m_fDeltaTime); }//清空颜色值与深度值 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(); }//pushMatrix，依据节点系统 对每一层节点进行转换 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(); }}

这样程序的主干线就分析出来了，完毕~~

结果：

运行后窗口时纯黑色的，控制台打印信息如下：

第一部分是EGLView 调用init的函数里面生成的，

第二部分是director 设置 EGLView完后 CCConfig 解析 glGPU相关信息再将CCConfig的dictionary中的所有内容输出的结果

忘了说一个错误：上面代码我将

    pDirector->setOpenGLView(pEGLView);
// Set the design resolution
pEGLView->setDesignResolutionSize(designResolutionSize.width, designResolutionSize.height, kResolutionNoBorder);

的调用顺序给弄反了，所以出错，如果按照这个调用顺序director中的resolutionSizeInPoints的值则跟designResolutionSize不一致了，然后再调用director的

setContentScaleFactor来修正，我感觉这种调用顺序好乱....等以后分析EGLViewProtocol时再整理这份混乱的思绪吧，累了，睡觉！如有错误欢迎指正，谢谢！