////  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; /// Interface provided by Application to other objects that need access to the current view state detailsclass AbstractViewStateInterface {public:    /// copies the current view frustum for rendering the view state    virtual void copyCurrentViewFrustum(ViewFrustum& viewOut) const = 0;     /// copies the shadow view frustum for rendering the view state    virtual void copyShadowViewFrustum(ViewFrustum& viewOut) const = 0;     virtual QThread* getMainThread() = 0;     virtual PickRay computePickRay(float x, float y) const = 0;     virtual glm::vec3 getAvatarPosition() const = 0;     virtual void postLambdaEvent(std::function<void()> f) = 0;    virtual qreal getDevicePixelRatio() = 0;     virtual render::ScenePointer getMain3DScene() = 0;    virtual render::EnginePointer getRenderEngine() = 0;     virtual void pushPostUpdateLambda(void* key, std::function<void()> func) = 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