C++学习（四四五）GraphicsWindowEmbedded为什么没有窗体接口

Posted 2022-01-02 hankern

缺少类似于Win32的

static osg::WindowingSystemInterfaceProxy<Win32WindowingSystem> s_proxy_Win32WindowingSystem("Win32");

osg/GraphicsContext
template<class T>
struct WindowingSystemInterfaceProxy

    WindowingSystemInterfaceProxy(const std::string& name)
    
        _wsi = new T;
        _wsi->setName(name);

        osg::GraphicsContext::getWindowingSystemInterfaces()->addWindowingSystemInterface(_wsi.get());
    

    ~WindowingSystemInterfaceProxy()
    
        osg::GraphicsContext::getWindowingSystemInterfaces()->removeWindowingSystemInterface(_wsi.get());
    

    osg::ref_ptr<T> _wsi;
;

可以自定义一个接口

class EmbeddedWindowingSystem : public osg::GraphicsContext::WindowingSystemInterface

public:
    osg::GraphicsContext *createGraphicsContext(osg::GraphicsContext::Traits *traits) override 
        osg::ref_ptr<osgViewer::GraphicsWindowEmbedded> window = new osgViewer::GraphicsWindowEmbedded(traits);
        if (window->valid()) return window.release();
        else return 0;
    

    unsigned int
    getNumScreens(const osg::GraphicsContext::ScreenIdentifier &screenIdentifier) override 
        return 0;
    

    void getScreenSettings(const osg::GraphicsContext::ScreenIdentifier &screenIdentifier,
                           osg::GraphicsContext::ScreenSettings &resolution) override 

    

    void enumerateScreenSettings(const osg::GraphicsContext::ScreenIdentifier &screenIdentifier,
                                 osg::GraphicsContext::ScreenSettingsList &resolutionList) override 

    

;

通过如下语句注册该窗体接口

osg::GraphicsContext::getWindowingSystemInterfaces()->addWindowingSystemInterface(new EmbeddedWindowingSystem());