////  AbstractViewStateInterface.h//  interface/src/renderer////  Created by Brad Hefta-Gaub on 12/16/14.//  Copyright 2014 High Fidelity, Inc.////  Distributed under the Apache License, Version 2.0.//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html// #ifndef hifi_AbstractViewStateInterface_h#define hifi_AbstractViewStateInterface_h #include <glm/glm.hpp>#include <functional> #include <render/Scene.h>#include <render/Engine.h> #include <QtGlobal> class Transform;class QThread;class ViewFrustum;class PickRay;class ConicalViewFrustum;using ConicalViewFrustums = std::vector<ConicalViewFrustum>; /// Interface provided by Application to other objects that need access to the current view state detailsclass AbstractViewStateInterface {public:    virtual const ConicalViewFrustums& getConicalViews() const = 0;     virtual QThread* getMainThread() = 0;     virtual PickRay computePickRay(float x, float y) const = 0;     virtual glm::vec3 getAvatarPosition() const = 0;     // Unfortunately, having this here is a bad idea.  Lots of objects connect to     // the aboutToQuit signal, and it's impossible to know the order in which     // the receivers will be called, so this might return false negatives    //virtual bool isAboutToQuit() const = 0;     // Queue code to execute on the main thread.     // If called from the main thread, the lambda will execute synchronously    virtual void postLambdaEvent(const std::function<void()>& f) = 0;    // Synchronously execute code on the main thread.  This function will    // not return until the code is executed, regardles of which thread it     // is called from    virtual void sendLambdaEvent(const std::function<void()>& f) = 0;     virtual render::ScenePointer getMain3DScene() = 0;    virtual render::EnginePointer getRenderEngine() = 0;     virtual void pushPostUpdateLambda(void* key, const std::function<void()>& func) = 0;     virtual bool isHMDMode() const = 0;     // FIXME - we shouldn't assume that there's a single instance of an AbstractViewStateInterface    static AbstractViewStateInterface* instance();    static void setInstance(AbstractViewStateInterface* instance);}; #endif  // hifi_AbstractViewStateInterface_h