cocos3——1.引擎运行流程

概述1.程序入口 // create the application instance AppDelegate app; return Application::getInstance()->run();2.主循环   int Application::run(): while(!glview->windowShouldClose()) { QueryP

1.程序入口

    // create the application instance    AppDelegate app;    return Application::getInstance()->run();

2.主循环
int Application::run():

while(!glvIEw->windowshouldClose())    {        queryPerformanceCounter(&nNow);        if (nNow.QuadPart - nLast.QuadPart > _animationInterval.QuadPart)        {            nLast.QuadPart = nNow.QuadPart;            			// 导演的主循环            director->mainLoop();            glvIEw->pollEvents();        }        else        {            Sleep(0);        }    }

mainLoop->drawScene:

    pushmatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW);        if (_runningScene)    {        //clear draw stats        _renderer->clearDrawStats();        		// visit和draw场景（但draw只是添加渲染命令）		// 进行渲染命令是在：renderer->render();        //render the scene        _runningScene->render(_renderer);                _eventdispatcher->dispatchEvent(_eventAfterVisit);    }	// 通知节点，独立于场景之后渲染    // draw the notifications node    if (_notificationNode)    {        _notificationNode->visit(_renderer,Mat4::IDENTITY,0);    }    if (_displayStats)    {        showStats();    }	// 下面是渲染_notificationNode和stats    _renderer->render();    _eventdispatcher->dispatchEvent(_eventAfterDraw);    popMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW);    _totalFrames++;    // swap buffers    if (_openGLVIEw)    {        _openGLVIEw->swapBuffers();    }

voID Scene::render(Renderer* renderer)：

        Camera::_visitingCamera = defaultCamera;        director->pushmatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION);        director->loadMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION,Camera::_visitingCamera->getVIEwProjectionMatrix());                //visit the scene        visit(renderer,0);        renderer->render();                director->popMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION);

3.节点遍历

voID Node::visit(Renderer* renderer,const Mat4 &parenttransform,uint32_t parentFlags)：

    // quick return if not visible. children won't be drawn.    if (!_visible)    {        return;    }    uint32_t flags = processparentFlags(parenttransform,parentFlags);    // important:    // To ease the migration to v3.0,we still support the Mat4 stack,// but it is deprecated and your code should not rely on it    Director* director = Director::getInstance();    director->pushmatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW);    director->loadMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW,_modelVIEwtransform);        bool visibleByCamera = isVisitableByVisitingCamera();    int i = 0;    if(!_children.empty())    {        sortAllChildren();        // draw children zOrder < 0        for( ; i < _children.size(); i++ )        {            auto node = _children.at(i);            if ( node && node->_localZOrder < 0 )                node->visit(renderer,_modelVIEwtransform,flags);            else                break;        }        // self draw        if (visibleByCamera)            this->draw(renderer,flags);        for(auto it=_children.cbegin()+i; it != _children.cend(); ++it)            (*it)->visit(renderer,flags);    }    else if (visibleByCamera)    {        this->draw(renderer,flags);    }    director->popMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW);

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