SceneGraphFactory.h

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#pragma once
#include <atomic>
#include <mutex>
 
#include "SceneGraph.h"
 
namespace dyno 
{
    typedef std::function<std::shared_ptr<SceneGraph>()> SceneGraphCreator;
 
    class SceneGraphFactory
    {
    public:
        static SceneGraphFactory* instance();
 
        std::shared_ptr<SceneGraph> active();

        std::shared_ptr<SceneGraph> createNewScene();
 
        std::shared_ptr<SceneGraph> createDefaultScene();
 
        void setDefaultCreator(SceneGraphCreator creator);
 
        void pushScene(std::shared_ptr<SceneGraph> scn);
 
        void popScene();
        void popAllScenes();
 
    private:
        SceneGraphFactory() = default;
        ~SceneGraphFactory() = default;
        SceneGraphFactory(const SceneGraphFactory&) = delete;
        SceneGraphFactory& operator=(const SceneGraphFactory&) = delete;
 
        std::stack<std::shared_ptr<SceneGraph>> mSceneGraphs;
 
    private:
        static std::atomic<SceneGraphFactory*> pInstance;
        static std::mutex mMutex;
 
        SceneGraphCreator mDefaultCreator;
    };
 
}