在OSG的Demo中找到MFC_OSG类文件。

1 #pragma once 2  3 #include 
      
        4 #include 
       
         5 #include 
        
          6 #include 
         
           7 #include 
          
            8 #include 
           
             9 #include 
            
             10 #include 
             
              11 #include 
              
               12 #include 
               
                13 14 class cOSG15 {16 public:17 cOSG(HWND hWnd);18 ~cOSG();19 20 void InitOSG(std::string filename);21 void InitManipulators(void);22 void InitSceneGraph(void);23 void InitCameraConfig(void);24 void SetupWindow(void);25 void SetupCamera(void);26 void PreFrameUpdate(void);27 void PostFrameUpdate(void);28 void Done(bool value) { mDone = value; }29 bool Done(void) { return mDone; }30 static void Render(void* ptr);31 32 osgViewer::Viewer* getViewer() { return mViewer; }33 34 private:35 bool mDone;36 std::string m_ModelName;37 HWND m_hWnd;38 osgViewer::Viewer* mViewer;39 osg::ref_ptr
                
                  mRoot;40 osg::ref_ptr
                 
                   mModel;41 osg::ref_ptr
                  
                    trackball;42 osg::ref_ptr
                   
                     keyswitchManipulator;43 };44 45 class CRenderingThread : public OpenThreads::Thread46 {47 public:48 CRenderingThread( cOSG* ptr );49 virtual ~CRenderingThread();50 51 virtual void run();52 53 protected:54 cOSG* _ptr;55 bool _done;56 };
                   
                  
                 
                
               
              
             
            
           
          
         
        
       
      

 实现文件：

1 // MFC_OSG.cpp : implementation of the cOSG class  2 //  3 #include "stdafx.h"  4 #include "MFC_OSG.h"  5   6   7 cOSG::cOSG(HWND hWnd) :  8    m_hWnd(hWnd)   9 { 10 } 11  12 cOSG::~cOSG() 13 { 14     mViewer->setDone(true); 15     Sleep(1000); 16     mViewer->stopThreading(); 17  18     delete mViewer; 19 } 20  21 void cOSG::InitOSG(std::string modelname) 22 { 23     // Store the name of the model to load 24     m_ModelName = modelname; 25  26     // Init different parts of OSG 27     InitManipulators(); 28     InitSceneGraph(); 29     InitCameraConfig(); 30 } 31  32 void cOSG::InitManipulators(void) 33 { 34     // Create a trackball manipulator 35     trackball = new osgGA::TrackballManipulator(); 36  37     // Create a Manipulator Switcher 38     keyswitchManipulator = new osgGA::KeySwitchMatrixManipulator; 39  40     // Add our trackball manipulator to the switcher 41     keyswitchManipulator->addMatrixManipulator( '1', "Trackball", trackball.get()); 42  43     // Init the switcher to the first manipulator (in this case the only manipulator) 44     keyswitchManipulator->selectMatrixManipulator(0);  // Zero based index Value 45 } 46  47  48 void cOSG::InitSceneGraph(void) 49 { 50     // Init the main Root Node/Group 51     mRoot  = new osg::Group; 52  53     // Load the Model from the model name 54     mModel = osgDB::readNodeFile(m_ModelName); 55     if (!mModel) return; 56  57     // Optimize the model 58     osgUtil::Optimizer optimizer; 59     optimizer.optimize(mModel.get()); 60     optimizer.reset(); 61  62     // Add the model to the scene 63     mRoot->addChild(mModel.get()); 64 } 65  66 void cOSG::InitCameraConfig(void) 67 { 68     // Local Variable to hold window size data 69     RECT rect; 70  71     // Create the viewer for this window 72     mViewer = new osgViewer::Viewer(); 73  74     // Add a Stats Handler to the viewer 75     mViewer->addEventHandler(new osgViewer::StatsHandler); 76      77     // Get the current window size 78     ::GetWindowRect(m_hWnd, &rect); 79  80     // Init the GraphicsContext Traits 81     osg::ref_ptr
      
        traits = new osg::GraphicsContext::Traits; 82  83     // Init the Windata Variable that holds the handle for the Window to display OSG in. 84     osg::ref_ptr
       
         windata = new osgViewer::GraphicsWindowWin32::WindowData(m_hWnd); 85  86     // Setup the traits parameters 87     traits->x = 0; 88     traits->y = 0; 89     traits->width = rect.right - rect.left; 90     traits->height = rect.bottom - rect.top; 91     traits->windowDecoration = false; 92     traits->doubleBuffer = true; 93     traits->sharedContext = 0; 94     traits->setInheritedWindowPixelFormat = true; 95     traits->inheritedWindowData = windata; 96  97     // Create the Graphics Context 98     osg::GraphicsContext* gc = osg::GraphicsContext::createGraphicsContext(traits.get()); 99 100     // Init Master Camera for this View101     osg::ref_ptr
        
          camera = mViewer->getCamera();102 103     // Assign Graphics Context to the Camera104     camera->setGraphicsContext(gc);105 106     // Set the viewport for the Camera107     camera->setViewport(new osg::Viewport(traits->x, traits->y, traits->width, traits->height));108 109     // Set projection matrix and camera attribtues110     camera->setClearMask(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);111     camera->setClearColor(osg::Vec4f(0.2f, 0.2f, 0.4f, 1.0f));112     camera->setProjectionMatrixAsPerspective(113         30.0f, static_cast
         
          (traits->width)/static_cast
          
           (traits->height), 1.0, 1000.0);114 115     // Add the Camera to the Viewer116     //mViewer->addSlave(camera.get());117     mViewer->setCamera(camera.get());118 119     // Add the Camera Manipulator to the Viewer120     mViewer->setCameraManipulator(keyswitchManipulator.get());121 122     // Set the Scene Data123     mViewer->setSceneData(mRoot.get());124 125     // Realize the Viewer126     mViewer->realize();127 128     // Correct aspect ratio129     /*double fovy,aspectRatio,z1,z2;130     mViewer->getCamera()->getProjectionMatrixAsPerspective(fovy,aspectRatio,z1,z2);131     aspectRatio=double(traits->width)/double(traits->height);132     mViewer->getCamera()->setProjectionMatrixAsPerspective(fovy,aspectRatio,z1,z2);*/133 }134 135 void cOSG::PreFrameUpdate()136 {137     // Due any preframe updates in this routine138 }139 140 void cOSG::PostFrameUpdate()141 {142     // Due any postframe updates in this routine143 }144 145 void cOSG::Render(void* ptr)146 {147     cOSG* osg = (cOSG*)ptr;148 149     osgViewer::Viewer* viewer = osg->getViewer();150 151     // You have two options for the main viewer loop152     //      viewer->run()   or153     //      while(!viewer->done()) { viewer->frame(); }154 155     //viewer->run();156     while(!viewer->done())157     {158         osg->PreFrameUpdate();159         viewer->frame();160         osg->PostFrameUpdate();161         //Sleep(10);         // Use this command if you need to allow other processes to have cpu time162     }163 164     // For some reason this has to be here to avoid issue: 165     // if you have multiple OSG windows up 166     // and you exit one then all stop rendering167     AfxMessageBox("Exit Rendering Thread");168 169     _endthread();170 }171 172 CRenderingThread::CRenderingThread( cOSG* ptr )173 :   OpenThreads::Thread(), _ptr(ptr), _done(false)174 {175 }176 177 CRenderingThread::~CRenderingThread()178 {179     _done = true;180     while( isRunning() )181         OpenThreads::Thread::YieldCurrentThread();182 }183 184 void CRenderingThread::run()185 {186     if ( !_ptr )187     {188         _done = true;189         return;190     }191 192     osgViewer::Viewer* viewer = _ptr->getViewer();193     do194     {195         _ptr->PreFrameUpdate();196         viewer->frame();197         _ptr->PostFrameUpdate();198     } while ( !testCancel() && !viewer->done() && !_done );199 }
          
         
        
       
      

新建MFC单文档程序，在视图头文件中添加：

1 public:2     cOSG *m_OSG;3     HANDLE m_ThreadHandle;4     afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);5     virtual void OnInitialUpdate();

实现代码：

1 int COSGMFCView::OnCreate(LPCREATESTRUCT lpCreateStruct) 2 { 3     if (CView::OnCreate(lpCreateStruct) == -1) 4         return -1; 5  6     // TODO:  在此添加您专用的创建代码 7      m_OSG = new cOSG(m_hWnd); 8  9     return 0;10 }11 12 13 void COSGMFCView::OnInitialUpdate()14 {15     CView::OnInitialUpdate();16     m_OSG->InitOSG("cessna.osg");17     m_ThreadHandle = (HANDLE)_beginthread(&cOSG::Render,0,m_OSG);18 19     // TODO: 在此添加专用代码和/或调用基类20 }