////  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 EnvironmentData; /// Interface provided by Application to other objects that need access to the current view state detailsclass AbstractViewStateInterface {public:        /// Returns the shadow distances for the current view state    virtual const glm::vec3& getShadowDistances() const = 0;     /// Computes the off-axis frustum parameters for the view frustum, taking mirroring into account.    virtual void computeOffAxisFrustum(float& left, float& right, float& bottom, float& top, float& nearVal,        float& farVal, glm::vec4& nearClipPlane, glm::vec4& farClipPlane) const = 0;     /// gets the current view frustum for rendering the view state    virtual ViewFrustum* getCurrentViewFrustum() = 0;     /// overrides environment data    virtual void overrideEnvironmentData(const EnvironmentData& newData) = 0;    virtual void endOverrideEnvironmentData() = 0;     /// gets the shadow view frustum for rendering the view state    virtual ViewFrustum* getShadowViewFrustum() = 0;     virtual bool getShadowsEnabled() = 0;    virtual bool getCascadeShadowsEnabled() = 0;     virtual QThread* getMainThread() = 0;    virtual const Transform& getViewTransform() const = 0;    virtual void setupWorldLight() = 0;    virtual bool shouldRenderMesh(float largestDimension, float distanceToCamera) = 0;    virtual float getSizeScale() const = 0;    virtual int getBoundaryLevelAdjust() const = 0;    virtual PickRay computePickRay(float x, float y) const = 0;     virtual const 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;     // 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