145 lines
5.4 KiB
C++
145 lines
5.4 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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#ifndef OSGDB_DATABASEPAGER
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#define OSGDB_DATABASEPAGER 1
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#include <osg/NodeVisitor>
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#include <osg/Group>
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#include <osg/PagedLOD>
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#include <osg/Drawable>
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#include <OpenThreads/Thread>
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#include <OpenThreads/Mutex>
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#include <osgDB/Export>
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#include <map>
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#include <set>
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namespace osgDB {
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/** Database paging class which manages the loading of files in a background thread,
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* and syncronizing of loaded models with the main scene graph.*/
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class OSGDB_EXPORT DatabasePager : public osg::NodeVisitor::DatabaseRequestHandler, public OpenThreads::Thread
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{
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public :
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DatabasePager();
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/** Add a request to load a node file to end the the database request list.*/
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virtual void requestNodeFile(const std::string& fileName,osg::Group* group);
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/** run does the database paging.*/
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virtual void run();
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/** Add the loaded data to the scene graph.*/
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void addLoadedDataToSceneGraph(double timeStamp);
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/** Find all PagedLOD nodes in a subgraph and register them with
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* the DatabasePager so it can keep track of expired nodes.
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* note, should be only be called from the update thread. */
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void registerPagedLODs(osg::Node* subgraph);
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/** Set the amount of time that a subgraph will be kept without being visited in the cull traversal
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* before being removed.*/
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void setExpiryDelay(double expiryDelay) { _expiryDelay = expiryDelay; }
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/** Get the amount of time that a subgraph will be kept without being visited in the cull traversal
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* before being removed.*/
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double getExpiryDelay() const { return _expiryDelay; }
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/** set whether the removed subgraphs should be deleted in the database thread or not.*/
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void setDeleteRemovedSubgraphsInDatabaseThread(bool flag) { _deleteRemovedSubgraphsInDatabaseThread = flag; }
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/** get whether the removed subgraphs should be deleted in the database thread or not.*/
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bool getDeleteRemovedSubgraphsInDatabaseThread() const { return _deleteRemovedSubgraphsInDatabaseThread; }
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/** Iterate through the active PagedLOD nodes children removing
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* children which havn't been visited since specified expiryTime.
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* note, should be only be called from the update thread. */
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void removeExpiredSubgraphs(double currentFrameTime);
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/** Turn the compilation of rendering objects for specfied graphics context on (true) or off(false).*/
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void setCompileRenderingObjectsForContexID(unsigned int contextID, bool on);
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/** Get whether the compilation of rendering objects for specfied graphics context on (true) or off(false).*/
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bool getCompileRenderingObjectsForContexID(unsigned int contextID);
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/** Compile the rendering objects (display lists,texture objects, VBO's) on loaded subgraph.
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* note, should only be called from the draw thread.*/
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void compileRenderingObjects(osg::State& state,double& availableTime);
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public:
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typedef std::vector< osg::ref_ptr<osg::PagedLOD> > PagedLODList;
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typedef std::vector< osg::ref_ptr<osg::StateSet> > StateSetList;
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typedef std::vector< osg::ref_ptr<osg::Drawable> > DrawableList;
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typedef std::pair<StateSetList,DrawableList> DataToCompile;
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typedef std::map< unsigned int, DataToCompile > DataToCompileMap;
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typedef std::set<unsigned int> ActiveGraphicsContexts;
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protected :
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virtual ~DatabasePager() {}
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struct DatabaseRequest : public osg::Referenced
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{
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DatabaseRequest():
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_numOfRequests(0)
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{}
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std::string _fileName;
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unsigned int _numOfRequests;
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osg::ref_ptr<osg::Group> _groupForAddingLoadedSubgraph;
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osg::ref_ptr<osg::Node> _loadedModel;
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DataToCompileMap _dataToCompileMap;
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};
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typedef std::vector< osg::ref_ptr<DatabaseRequest> > DatabaseRequestList;
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DatabaseRequestList _fileRequestList;
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OpenThreads::Mutex _fileRequestListMutex;
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DatabaseRequestList _dataToCompileList;
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OpenThreads::Mutex _dataToCompileListMutex;
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bool _deleteRemovedSubgraphsInDatabaseThread;
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osg::NodeList _childrenToDeleteList;
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OpenThreads::Mutex _childrenToDeleteListMutex;
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DatabaseRequestList _dataToMergeList;
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OpenThreads::Mutex _dataToMergeListMutex;
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PagedLODList _pagedLODList;
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double _expiryDelay;
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ActiveGraphicsContexts _activeGraphicsContexts;
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};
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}
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#endif
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