集成的关键是从Drawable派生子类，在子类内部执行cegui绘制，同时需要注意CEGUI的初始化，需要放到realize()函数之后，否则无法拿到OpenGL HRC。核心代码如下：

CEGUILayer.h

#ifndef CEGUI_LAYER_H
#define CEGUI_LAYER_H#include <CEGUI/System.h>
#include <CEGUI/RendererModules/OpenGL/GLRenderer.h>
#include <CEGUI/ScriptModule.h>
#include <CEGUI/FontManager.h>
#include <CEGUI/SchemeManager.h>
#include <CEGUI/WindowManager.h>
#include <CEGUI/Exceptions.h>
#include <CEGUI/GUIContext.h>
#include <CEGUI/Window.h>
#include <CEGUI/widgets/FrameWindow.h>
#include <CEGUI/DefaultResourceProvider.h>
#include <CEGUI/ImageManager.h>
#include <CEGUI/falagard/WidgetLookManager.h>#include <iostream>  #include <osgDB/ReadFile>
#include <osgUtil/Optimizer>
#include <osg/State>
#include <osgViewer/Viewer>
#include <osg/CoordinateSystemNode>
#include <osgGA/GUIEventAdapter>  class CEGUIDrawable : public osg::Drawable
{
public:  CEGUIDrawable();  /** Copy constructor using CopyOp to manage deep vs shallow copy.*/  CEGUIDrawable(const CEGUIDrawable& drawable,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY):  Drawable(drawable,copyop) {}  META_Object(osg,CEGUIDrawable);  void initResource();void config();void drawImplementation(osg::RenderInfo& renderInfo) const;  protected:      virtual ~CEGUIDrawable();  unsigned int _activeContextID;  CEGUI::Window*  d_root;CEGUI::OpenGLRenderer* m_render;}; struct CEGUIEventCallback : public osgGA::GUIEventHandler
{  CEGUIEventCallback() {}  /** do customized Event code. */  virtual bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter& aa, osg::Object* obj, osg::NodeVisitor* nv)  {  osgGA::EventVisitor* ev = dynamic_cast<osgGA::EventVisitor*>(nv);  CEGUIDrawable* cd = dynamic_cast<CEGUIDrawable*>(obj);  CEGUI::GUIContext& context = CEGUI::System::getSingleton().getDefaultGUIContext();if (!ev || !cd) return false;  float fInvY = ea.getWindowHeight() - ea.getY();switch(ea.getEventType())  {  case(osgGA::GUIEventAdapter::DRAG):  case(osgGA::GUIEventAdapter::MOVE):  context.injectMousePosition(ea.getX(),fInvY);  return true;  case(osgGA::GUIEventAdapter::PUSH):  {  context.injectMousePosition(ea.getX(), fInvY);  if (ea.getButton() == osgGA::GUIEventAdapter::LEFT_MOUSE_BUTTON)  // left  context.injectMouseButtonDown(CEGUI::LeftButton);  else if (ea.getButton() == osgGA::GUIEventAdapter::MIDDLE_MOUSE_BUTTON)  // middle  context.injectMouseButtonDown(CEGUI::MiddleButton);  else if (ea.getButton() == osgGA::GUIEventAdapter::RIGHT_MOUSE_BUTTON)  // right  context.injectMouseButtonDown(CEGUI::RightButton);  return true;  }  case(osgGA::GUIEventAdapter::RELEASE):  {  context.injectMousePosition(ea.getX(), fInvY);  if (ea.getButton() == osgGA::GUIEventAdapter::LEFT_MOUSE_BUTTON)  // left  context.injectMouseButtonUp(CEGUI::LeftButton);  else if (ea.getButton() == osgGA::GUIEventAdapter::MIDDLE_MOUSE_BUTTON)  // middle  context.injectMouseButtonUp(CEGUI::MiddleButton);  else if (ea.getButton() == osgGA::GUIEventAdapter::RIGHT_MOUSE_BUTTON)  // right  context.injectMouseButtonUp(CEGUI::RightButton);  return true;  }  case(osgGA::GUIEventAdapter::DOUBLECLICK):  {  // do we need to do something special here to handle double click???  Will just assume button down for now.  context.injectMousePosition(ea.getX(), fInvY);  if (ea.getButton() == osgGA::GUIEventAdapter::LEFT_MOUSE_BUTTON)  // left  context.injectMouseButtonDown(CEGUI::LeftButton);  else if (ea.getButton() == osgGA::GUIEventAdapter::MIDDLE_MOUSE_BUTTON)  // middle  context.injectMouseButtonDown(CEGUI::MiddleButton);  else if (ea.getButton() == osgGA::GUIEventAdapter::RIGHT_MOUSE_BUTTON)  // right  context.injectMouseButtonDown(CEGUI::RightButton);  return true;  }  case(osgGA::GUIEventAdapter::KEYDOWN):  context.injectKeyDown( static_cast<CEGUI::Key::Scan>(ea.getKey()) );  context.injectChar( static_cast<CEGUI::Key::Scan>( ea.getKey() ) );  return true;  case(osgGA::GUIEventAdapter::KEYUP):  context.injectKeyUp( static_cast<CEGUI::Key::Scan>(ea.getKey()) );  return true;  default:  break;  }  return false;  }
};
#endif // CEGUI_LAYER_H

CEGUILayer.cpp

#include "ceGuiLayer.h"CEGUIDrawable::CEGUIDrawable()
{  setSupportsDisplayList(false);  setEventCallback(new CEGUIEventCallback()); /*  new CEGUI::System( new CEGUI::OpenGLRenderer(0) );  */// Create an OpenGLRenderer object that uses the current GL viewport as// the default output surface.CEGUI::OpenGLRenderer& myRenderer =CEGUI::OpenGLRenderer::create();_activeContextID = 0;  m_render = &myRenderer;CEGUI::System::create(myRenderer);
}  CEGUIDrawable::~CEGUIDrawable()
{  // delete CEGUI??  CEGUI::System::destroy(); CEGUI::OpenGLRenderer::destroy(*m_render);
}  void CEGUIDrawable::drawImplementation(osg::RenderInfo& renderInfo) const
{  osg::State* state = renderInfo.getState();  if (state->getContextID()!=_activeContextID) return;  glPushAttrib(GL_ALL_ATTRIB_BITS);  state->disableAllVertexArrays();  /* CEGUI::System::getSingleton().renderGUI();  */{// user function to draw 3D scene// draw3DScene();// make sure that before calling renderAllGUIContexts, that any bound textures// and shaders used to render the scene above are disabled using// glBindTexture(0) and glUseProgram(0) respectively also set// glActiveTexture(GL_TEXTURE_0) // draw GUI// NB: When using the old desktop OpenGL 1.2 renderer, this call should not// occur between glBegin/glEnd calls.CEGUI::System::getSingleton().renderAllGUIContexts();}glPopAttrib();  state->checkGLErrors("CEGUIDrawable::drawImplementation");
}  void CEGUIDrawable::initResource()
{using namespace CEGUI;// CEGUI relies on various systems being set-up, so this is what we do// here first.//// The first thing to do is load a CEGUI 'scheme' this is basically a file// that groups all the required resources and definitions for a particular// skin so they can be loaded / initialised easily//// So, we use the SchemeManager singleton to load in a scheme that loads the// imagery and registers widgets for the TaharezLook skin.  This scheme also// loads in a font that gets used as the system default.SchemeManager::getSingleton().createFromFile("TaharezLook.scheme");// The next thing we do is to set a default mouse cursor image.  This is// not strictly essential, although it is nice to always have a visible// cursor if a window or widget does not explicitly set one of its own.//// The TaharezLook Imageset contains an Image named "MouseArrow" which is// the ideal thing to have as a defult mouse cursor image.CEGUI::GUIContext& guiContext = CEGUI::System::getSingleton().getDefaultGUIContext();guiContext.getMouseCursor().setDefaultImage("TaharezLook/MouseArrow");// Now the system is initialised, we can actually create some UI elements, for// this first example, a full-screen 'root' window is set as the active GUI// sheet, and then a simple frame window will be created and attached to it.// All windows and widgets are created via the WindowManager singleton.WindowManager& winMgr = WindowManager::getSingleton();// Here we create a "DefaultWindow".  This is a native type, that is, it does// not have to be loaded via a scheme, it is always available.  One common use// for the DefaultWindow is as a generic container for other windows.  Its// size defaults to 1.0f x 1.0f using the Relative metrics mode, which means// when it is set as the root GUI sheet window, it will cover the entire display.// The DefaultWindow does not perform any rendering of its own, so is invisible.//// Create a DefaultWindow called 'Root'.d_root = winMgr.createWindow( "DefaultWindow", "root" );System::getSingleton().getDefaultGUIContext().setRootWindow( d_root );// load font and setup default if not loaded via schemeFont& defaultFont = FontManager::getSingleton().createFromFile("DejaVuSans-12.font");// Set default font for the gui contextguiContext.setDefaultFont(&defaultFont);// Set the root window as root of our GUI ContextguiContext.setRootWindow((CEGUI::Window*)d_root);// A FrameWindow is a window with a frame and a titlebar which may be moved around// and resized.//// Create a FrameWindow in the TaharezLook style, and name it 'Demo Window'CEGUI::FrameWindow* wnd = (FrameWindow*)winMgr.createWindow("TaharezLook/FrameWindow", "Demo Window");// Here we attach the newly created FrameWindow to the previously created// DefaultWindow which we will be using as the root of the displayed gui.d_root->addChild((CEGUI::Element*)wnd);// Windows are in Relative metrics mode by default.  This means that we can// specify sizes and positions without having to know the exact pixel size// of the elements in advance.  The relative metrics mode co-ordinates are// relative to the parent of the window where the co-ordinates are being set.// This means that if 0.5f is specified as the width for a window, that window// will be half as its parent window.//// Here we set the FrameWindow so that it is half the size of the display,// and centered within the display.wnd->setPosition(UVector2(cegui_reldim(0.25f), cegui_reldim( 0.25f)));wnd->setSize(USize(cegui_reldim(0.5f), cegui_reldim( 0.5f)));// now we set the maximum and minum sizes for the new window.  These are// specified using relative co-ordinates, but the important thing to note// is that these settings are aways relative to the display rather than the// parent window.//// here we set a maximum size for the FrameWindow which is equal to the size// of the display, and a minimum size of one tenth of the display.wnd->setMaxSize(USize(cegui_reldim(1.0f), cegui_reldim( 1.0f)));wnd->setMinSize(USize(cegui_reldim(0.1f), cegui_reldim( 0.1f)));// As a final step in the initialisation of our sample window, we set the window's// text to "Hello World!", so that this text will appear as the caption in the// FrameWindow's titlebar.wnd->setText("Hello World!");//wnd->subscribeEvent(CEGUI::Window::EventMouseClick,  Event::Subscriber(&HelloWorldDemo::handleHelloWorldClicked, this));// return true so that the samples framework knows that initialisation was a
}void CEGUIDrawable::config()
{
#if 1CEGUI::DefaultResourceProvider* rp = static_cast<CEGUI::DefaultResourceProvider*>(CEGUI::System::getSingleton().getResourceProvider());rp->setResourceGroupDirectory("schemes", "D:/cegui/cegui-0.8.7/datafiles/schemes/");rp->setResourceGroupDirectory("imagesets", "D:/cegui/cegui-0.8.7/datafiles/imagesets/");rp->setResourceGroupDirectory("fonts", "D:/cegui/cegui-0.8.7/datafiles/fonts/");rp->setResourceGroupDirectory("layouts", "D:/cegui/cegui-0.8.7/datafiles/layouts/");rp->setResourceGroupDirectory("looknfeels", "D:/cegui/cegui-0.8.7/datafiles/looknfeel/");rp->setResourceGroupDirectory("lua_scripts", "D:/cegui/cegui-0.8.7/datafiles/lua_scripts/");
#elseCEGUI::DefaultResourceProvider* rp = static_cast<CEGUI::DefaultResourceProvider*>(CEGUI::System::getSingleton().getResourceProvider());rp->setResourceGroupDirectory("schemes", "./../datafiles/schemes/");rp->setResourceGroupDirectory("imagesets", "./../datafiles/imagesets/");rp->setResourceGroupDirectory("fonts", "./../datafiles/fonts/");rp->setResourceGroupDirectory("layouts", "./../datafiles/layouts/");rp->setResourceGroupDirectory("looknfeels", "./../datafiles/looknfeel/");rp->setResourceGroupDirectory("lua_scripts", "./../datafiles/lua_scripts/");
#endif CEGUI::ImageManager::setImagesetDefaultResourceGroup("imagesets");CEGUI::Font::setDefaultResourceGroup("fonts");CEGUI::Scheme::setDefaultResourceGroup("schemes");CEGUI::WidgetLookManager::setDefaultResourceGroup("looknfeels");CEGUI::WindowManager::setDefaultResourceGroup("layouts");CEGUI::ScriptModule::setDefaultResourceGroup("lua_scripts");}

Main.cpp

#include "ceGuiLayer.h"int main( int argc, char **argv )
{  // use an ArgumentParser object to manage the program arguments.  osg::ArgumentParser arguments(&argc,argv);  // construct the viewer.  osgViewer::Viewer viewer;  // creat rc//创建渲染窗口  osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;  traits->x = 0;  traits->y = 0;  traits->width = 800;  traits->height = 600;  traits->windowDecoration = true;  traits->doubleBuffer = true;  traits->sharedContext = 0;  osg::ref_ptr<osg::GraphicsContext> gc = osg::GraphicsContext::createGraphicsContext(traits.get());  if (gc.valid())  {  viewer.getCamera()->setGraphicsContext(gc.get());viewer.getCamera()->setViewport(10,10,800,600);gc->setClearColor(osg::Vec4f(0.2f,0.2f,0.6f,1.0f));  gc->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);  }  else  {  osg::notify(osg::NOTICE)<<"  GraphicsWindow has not been created successfully."<<std::endl;  }  // read the scene from the list of file specified command line args.  osg::ref_ptr<osg::Node> loadedModel = osgDB::readNodeFiles(arguments);  // if no model has been successfully loaded report failure.  if (!loadedModel)   {  std::cout << arguments.getApplicationName() <<": No data loaded" << std::endl;  } else{loadedModel = osgDB::readNodeFile("cow.osg");  }osg::ref_ptr<osg::Group> group = new osg::Group;  group->addChild(loadedModel.get());  // pass the loaded scene graph to the viewer.  viewer.setSceneData(group.get());  viewer.setThreadingModel(osgViewer::Viewer::SingleThreaded);//设置单线程模式viewer.realize();osg::ref_ptr<osg::Geode> geode = new osg::Geode;  viewer.getCamera()->getGraphicsContext()->makeCurrent();osg::ref_ptr<CEGUIDrawable> cd = new CEGUIDrawable();  geode->addDrawable(cd.get());  group->addChild(geode.get()); cd->config();cd->initResource();// run the viewer  return viewer.run();
} 参考：https://blog.csdn.net/greyfreedom/article/details/8574865

遗留问题

CEGUI加载资源，设置相对路径总是失败，所以先使用绝对路径，以后再查原因。

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osg3.0 集成 CEGUI 0.8.7

遗留问题

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