////  EntityTreeSendThread.h//  assignment-client/src/entities////  Created by Stephen Birarda on 2/15/17.//  Copyright 2017 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_EntityTreeSendThread_h#define hifi_EntityTreeSendThread_h #include <unordered_set> #include "../octree/OctreeSendThread.h" #include <DiffTraversal.h>#include <EntityPriorityQueue.h>#include <shared/ConicalViewFrustum.h>  class EntityNodeData;class EntityItem; class EntityTreeSendThread : public OctreeSendThread {    Q_OBJECT public:    EntityTreeSendThread(OctreeServer* myServer, const SharedNodePointer& node); protected:    bool traverseTreeAndSendContents(SharedNodePointer node, OctreeQueryNode* nodeData,            bool viewFrustumChanged, bool isFullScene) override; private slots:    void resetState(); // clears our known state forcing entities to appear unsent private:    // the following two methods return booleans to indicate if any extra flagged entities were new additions to set    bool addAncestorsToExtraFlaggedEntities(const QUuid& filteredEntityID, EntityItem& entityItem, EntityNodeData& nodeData);    bool addDescendantsToExtraFlaggedEntities(const QUuid& filteredEntityID, EntityItem& entityItem, EntityNodeData& nodeData);     void startNewTraversal(const DiffTraversal::View& viewFrustum, EntityTreeElementPointer root, bool forceFirstPass = false);    bool traverseTreeAndBuildNextPacketPayload(EncodeBitstreamParams& params, const QJsonObject& jsonFilters) override;     void preDistributionProcessing() override;    bool hasSomethingToSend(OctreeQueryNode* nodeData) override { return !_sendQueue.empty(); }    bool shouldStartNewTraversal(OctreeQueryNode* nodeData, bool viewFrustumChanged) override { return viewFrustumChanged || _traversal.finished(); }     DiffTraversal _traversal;    EntityPriorityQueue _sendQueue;    std::unordered_map<EntityItem*, uint64_t> _knownState;     // packet construction stuff    EntityTreeElementExtraEncodeDataPointer _extraEncodeData { new EntityTreeElementExtraEncodeData() };    int32_t _numEntitiesOffset { 0 };    uint16_t _numEntities { 0 }; private slots:    void editingEntityPointer(const EntityItemPointer& entity);    void deletingEntityPointer(EntityItem* entity);}; #endif // hifi_EntityTreeSendThread_h