/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield * * This library is open source and may be redistributed and/or modified under * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or * (at your option) any later version. The full license is in LICENSE file * included with this distribution, and on the openscenegraph.org website. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * OpenSceneGraph Public License for more details. */ #ifndef OSGDB_DATABASEPAGER #define OSGDB_DATABASEPAGER 1 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include namespace osgDB { /** Database paging class which manages the loading of files in a background thread, * and synchronizing of loaded models with the main scene graph.*/ class OSGDB_EXPORT DatabasePager : public osg::NodeVisitor::DatabaseRequestHandler { public : typedef OpenThreads::Thread::ThreadPriority ThreadPriority; DatabasePager(); DatabasePager(const DatabasePager& rhs); /** Create a shallow copy on the DatabasePager.*/ virtual DatabasePager* clone() const { return new DatabasePager(*this); } /** get the prototype singleton used by DatabasePager::create().*/ static osg::ref_ptr& prototype(); /** create a DatabasePager by cloning DatabasePager::prototype().*/ static DatabasePager* create(); /** Add a request to load a node file to end the the database request list.*/ virtual void requestNodeFile(const std::string& fileName,osg::Group* group, float priority, const osg::FrameStamp* framestamp, osg::ref_ptr& databaseRequest); virtual void requestNodeFile(const std::string& fileName,osg::Group* group, float priority, const osg::FrameStamp* framestamp, osg::ref_ptr& databaseRequest, ReaderWriter::Options* loadOptions); /** Set the priority of the database pager thread(s).*/ int setSchedulePriority(OpenThreads::Thread::ThreadPriority priority); /** Cancel the database pager thread(s).*/ virtual int cancel(); virtual bool isRunning() const; /** Clear all internally cached structures.*/ virtual void clear(); class OSGDB_EXPORT DatabaseThread : public osg::Referenced, public OpenThreads::Thread { public: enum Mode { HANDLE_ALL_REQUESTS, HANDLE_NON_HTTP, HANDLE_ONLY_HTTP }; DatabaseThread(DatabasePager* pager, Mode mode, const std::string& name); DatabaseThread(const DatabaseThread& dt, DatabasePager* pager); void setDone(bool done) { _done = done; } bool getDone() const { return _done; } virtual int cancel(); virtual void run(); protected: virtual ~DatabaseThread(); bool _done; DatabasePager* _pager; Mode _mode; std::string _name; }; DatabaseThread* getDatabaseThread(unsigned int i) { return _databaseThreads[i].get(); } const DatabaseThread* getDatabaseThread(unsigned int i) const { return _databaseThreads[i].get(); } unsigned int getNumDatabaseThreads() const { return _databaseThreads.size(); } /** Set whether the database pager thread should be paused or not.*/ void setDatabasePagerThreadPause(bool pause); /** Get whether the database pager thread should is paused or not.*/ bool getDatabasePagerThreadPause() const { return _databasePagerThreadPaused; } /** Set whether new database request calls are accepted or ignored.*/ void setAcceptNewDatabaseRequests(bool acceptNewRequests) { _acceptNewRequests = acceptNewRequests; } /** Get whether new database request calls are accepted or ignored.*/ bool getAcceptNewDatabaseRequests() const { return _acceptNewRequests; } /** Get the number of frames that are currently active.*/ int getNumFramesActive() const { return _numFramesActive; } /** Signal the database thread that the update, cull and draw has begun for a new frame. * Note, this is called by the application so that the database pager can go to sleep while the CPU is busy on the main rendering threads. */ virtual void signalBeginFrame(const osg::FrameStamp* framestamp); /** Signal the database thread that the update, cull and draw dispatch has completed. * Note, this is called by the application so that the database pager can go to wake back up now the main rendering threads are iddle waiting for the next frame.*/ virtual void signalEndFrame(); /** Find all PagedLOD nodes in a subgraph and register them with * the DatabasePager so it can keep track of expired nodes. * note, should be only be called from the update thread. */ virtual void registerPagedLODs(osg::Node* subgraph); /** Set whether the database pager should pre compile OpenGL objects before allowing * them to be merged into the scene graph. * Pre compilation helps reduce the chances of frame drops, but also slows the * speed at which tiles are merged as they have to be compiled first.*/ void setDoPreCompile(bool flag) { _doPreCompile = flag; } /** Get whether the database pager should pre compile OpenGL objects before allowing * them to be merged into the scene graph.*/ bool getDoPreCompile() const { return _doPreCompile; } /** Set the target frame rate that the DatabasePager should assume. * Typically one would set this to the value refresh rate of your display system i.e. 60Hz. * Default value is 100. * Usage notes. The TargetFrameRate and the MinimumTimeAvailableForGLCompileAndDeletePerFrame * parameters are not directly used by DatabasePager, but are should be used as a guide for how * long to set aside per frame for compiling and deleting OpenGL objects - ie. the value to use * when calling DatabasePager::compileGLObjectgs(state,availableTime,). The longer amount of * time to set aside cthe faster databases will be paged in but with increased chance of frame drops, * the lower the amount of time the set aside the slower databases will paged it but with better * chance of avoid any frame drops. The default values are chosen to achieve the later when running * on a modern mid to high end PC. * The way to compute the amount of available time use a scheme such as : * availableTime = maximum(1.0/targetFrameRate - timeTakenDuringUpdateCullAndDraw, minimumTimeAvailableForGLCompileAndDeletePerFrame). */ void setTargetFrameRate(double tfr) { _targetFrameRate = tfr; } /** Get the target frame rate that the DatabasePager should assume.*/ double getTargetFrameRate() const { return _targetFrameRate; } /** Set the minimum amount of time (in seconds) that should be made available for compiling and delete OpenGL objects per frame. * Default value is 0.001 (1 millisecond). * For usage see notes in setTargetFrameRate.*/ void setMinimumTimeAvailableForGLCompileAndDeletePerFrame(double ta) { _minimumTimeAvailableForGLCompileAndDeletePerFrame = ta; } /** Get the minimum amount of time that should be made available for compiling and delete OpenGL objects per frame. * For usage see notes in setTargetFrameRate.*/ double getMinimumTimeAvailableForGLCompileAndDeletePerFrame() const { return _minimumTimeAvailableForGLCompileAndDeletePerFrame; } /** Set the maximum number of OpenGL objects that the page should attempt to compile per frame. * Note, Lower values reduces chances of a frame drop but lower the rate that database will be paged in at. * Default value is 8. */ void setMaximumNumOfObjectsToCompilePerFrame(unsigned int num) { _maximumNumOfObjectsToCompilePerFrame = num; } /** Get the maximum number of OpenGL objects that the page should attempt to compile per frame.*/ unsigned int getMaximumNumOfObjectsToCompilePerFrame() const { return _maximumNumOfObjectsToCompilePerFrame; } /** Set the amount of time that a subgraph will be kept without being visited in the cull traversal * before being removed.*/ void setExpiryDelay(double expiryDelay) { _expiryDelay = expiryDelay; } /** Get the amount of time that a subgraph will be kept without being visited in the cull traversal * before being removed.*/ double getExpiryDelay() const { return _expiryDelay; } /** Set whether the removed subgraphs should be deleted in the database thread or not.*/ void setDeleteRemovedSubgraphsInDatabaseThread(bool flag) { _deleteRemovedSubgraphsInDatabaseThread = flag; } /** Get whether the removed subgraphs should be deleted in the database thread or not.*/ bool getDeleteRemovedSubgraphsInDatabaseThread() const { return _deleteRemovedSubgraphsInDatabaseThread; } enum DrawablePolicy { DO_NOT_MODIFY_DRAWABLE_SETTINGS, USE_DISPLAY_LISTS, USE_VERTEX_BUFFER_OBJECTS, USE_VERTEX_ARRAYS }; /** Set how loaded drawables should be handled w.r.t their display list/vertex buffer object/vertex array settings.*/ void setDrawablePolicy(DrawablePolicy policy) { _drawablePolicy = policy; } /** Get how loaded drawables should be handled w.r.t their display list/vertex buffer object/vertex array settings.*/ DrawablePolicy getDrawablePolicy() const { return _drawablePolicy; } /** Set whether newly loaded textures should have their UnrefImageDataAfterApply set to a specified value.*/ void setUnrefImageDataAfterApplyPolicy(bool changeAutoUnRef, bool valueAutoUnRef) { _changeAutoUnRef = changeAutoUnRef; _valueAutoUnRef = valueAutoUnRef; } /** Get whether newly loaded textures should have their UnrefImageDataAfterApply set to a specified value.*/ void getUnrefImageDataAfterApplyPolicy(bool& changeAutoUnRef, bool& valueAutoUnRef) const { changeAutoUnRef = _changeAutoUnRef; valueAutoUnRef = _valueAutoUnRef; } /** Set whether newly loaded textures should have their MaxAnisotopy set to a specified value.*/ void setMaxAnisotropyPolicy(bool changeAnisotropy, float valueAnisotropy) { _changeAnisotropy = changeAnisotropy; _valueAnisotropy = valueAnisotropy; } /** Set whether newly loaded textures should have their MaxAnisotopy set to a specified value.*/ void getMaxAnisotropyPolicy(bool& changeAnisotropy, float& valueAnisotropy) const { changeAnisotropy = _changeAnisotropy; valueAnisotropy = _valueAnisotropy; } /** Return true if there are pending updates to the scene graph that require a call to updateSceneGraph(double). */ bool requiresUpdateSceneGraph() const; /** Merge the changes to the scene graph by calling calling removeExpiredSubgraphs then addLoadedDataToSceneGraph. * Note, must only be called from single thread update phase. */ virtual void updateSceneGraph(double currentFrameTime) { removeExpiredSubgraphs(currentFrameTime); addLoadedDataToSceneGraph(currentFrameTime); } /** Turn the compilation of rendering objects for specified graphics context on (true) or off(false). */ void setCompileGLObjectsForContextID(unsigned int contextID, bool on); /** Get whether the compilation of rendering objects for specified graphics context on (true) or off(false). */ bool getCompileGLObjectsForContextID(unsigned int contextID); /** Return true if an external draw thread should call compileGLObjects(..) or not.*/ bool requiresExternalCompileGLObjects(unsigned int contextID) const; /** Return true if there are pending compile operations that are required. * If requiresCompileGLObjects() return true the application should call compileGLObjects() .*/ bool requiresCompileGLObjects() const; /** Compile the rendering objects (display lists,texture objects, VBO's) on loaded subgraph. * note, should only be called from the draw thread. * Note, must only be called from a valid graphics context. */ virtual void compileGLObjects(osg::State& state,double& availableTime); /** Compile the rendering objects (display lists,texture objects, VBO's) on loaded subgraph. * note, should only be called from the draw thread. * Note, must only be called from a valid graphics context. */ virtual void compileAllGLObjects(osg::State& state); /** Report how many items are in the _fileRequestList queue */ unsigned int getFileRequestListSize() const { return _fileRequestQueue->_requestList.size() + _httpRequestQueue->_requestList.size(); } /** Report how many items are in the _dataToCompileList queue */ unsigned int getDataToCompileListSize() const { return _dataToCompileList->_requestList.size(); } /** Get the minimum time between the first request for a tile to be loaded and the time of its merge into the main scene graph.*/ double getMinimumTimeToMergeTile() const { return _minimumTimeToMergeTile; } /** Get the maximum time between the first request for a tile to be loaded and the time of its merge into the main scene graph.*/ double getMaximumTimeToMergeTile() const { return _maximumTimeToMergeTile; } /** Get the average time between the first request for a tile to be loaded and the time of its merge into the main scene graph.*/ double getAverageTimeToMergeTiles() const { return _totalTimeToMergeTiles/static_cast(_numTilesMerges); } /** Reset the Stats variables.*/ void resetStats(); typedef std::list< osg::ref_ptr > PagedLODList; typedef std::set< osg::ref_ptr > StateSetList; typedef std::vector< osg::ref_ptr > DrawableList; typedef std::pair DataToCompile; typedef std::map< unsigned int, DataToCompile > DataToCompileMap; typedef std::set ActiveGraphicsContexts; typedef std::vector< osg::observer_ptr > CompileGraphicsContexts; protected: virtual ~DatabasePager(); friend class DatabaseThread; friend struct DatabaseRequest; struct RequestQueue; struct DatabaseRequest : public osg::Referenced { DatabaseRequest(): osg::Referenced(true), _frameNumberFirstRequest(0), _timestampFirstRequest(0.0), _priorityFirstRequest(0.f), _frameNumberLastRequest(0), _timestampLastRequest(0.0), _priorityLastRequest(0.0f), _numOfRequests(0), _requestQueue(0) {} std::string _fileName; int _frameNumberFirstRequest; double _timestampFirstRequest; float _priorityFirstRequest; int _frameNumberLastRequest; double _timestampLastRequest; float _priorityLastRequest; unsigned int _numOfRequests; osg::observer_ptr _groupForAddingLoadedSubgraph; osg::ref_ptr _loadedModel; DataToCompileMap _dataToCompileMap; osg::ref_ptr _loadOptions; RequestQueue* _requestQueue; bool isRequestCurrent (int frameNumber) const { return frameNumber - _frameNumberLastRequest <= 1; } }; struct RequestQueue : public osg::Referenced { typedef std::list< osg::ref_ptr > RequestList; RequestList _requestList; OpenThreads::Mutex _requestMutex; }; typedef std::vector< osg::ref_ptr > DatabaseThreadList; typedef std::vector< osg::ref_ptr > ObjectList; struct ReadQueue : public RequestQueue { ReadQueue(DatabasePager* pager, const std::string& name); void block() { _block->block(); } void release() { _block->release(); } void updateBlock() { _block->set((!_requestList.empty() || !_childrenToDeleteList.empty()) && !_pager->_databasePagerThreadPaused); } void clear(); void add(DatabaseRequest* databaseRequest); void takeFirst(osg::ref_ptr& databaseRequest); osg::ref_ptr _block; DatabasePager* _pager; std::string _name; OpenThreads::Mutex _childrenToDeleteListMutex; ObjectList _childrenToDeleteList; }; // forward declare inner helper classes class FindCompileableGLObjectsVisitor; friend class FindCompileableGLObjectsVisitor; class MarkPagedLODsVisitor; class FindPagedLODsVisitor; friend class FindPagedLODsVisitor; struct SortFileRequestFunctor; friend struct SortFileRequestFunctor; OpenThreads::Mutex _run_mutex; bool _startThreadCalled; // Helper functions for determining if objects need to be // compiled. inline static bool isCompiled(const osg::Texture* texture, unsigned int contextID) { return( texture->getTextureObject(contextID) != NULL ); } // Is texture compiled for all active contexts? inline bool isCompiled(osg::Texture* texture) const { for (ActiveGraphicsContexts::const_iterator iter=_activeGraphicsContexts.begin(); iter!=_activeGraphicsContexts.end(); ++iter ) { if ( texture->getTextureObject(*iter) == NULL ) return false; } return true; } inline static bool isCompiled(const osg::StateSet* stateSet, unsigned int contextID) { for (unsigned i = 0; i < stateSet->getTextureAttributeList().size(); ++i) { const osg::Texture* texture = dynamic_cast(stateSet->getTextureAttribute(i,osg::StateAttribute::TEXTURE)); if (texture && !isCompiled(texture, contextID)) return false; } return true; } inline bool isCompiled(osg::StateSet* stateSet) { for (unsigned i = 0; i < stateSet->getTextureAttributeList().size(); ++i) { osg::Texture* texture = dynamic_cast(stateSet->getTextureAttribute(i,osg::StateAttribute::TEXTURE)); if (texture) { for (ActiveGraphicsContexts::iterator iter=_activeGraphicsContexts.begin(); iter!=_activeGraphicsContexts.end(); ++iter ) { if ( texture->getTextureObject(*iter) == NULL ) return false; } } } return true; } inline static bool isCompiled(const osg::Drawable* drawable, unsigned int contextID) { // Worry about vbos later if (drawable->getUseDisplayList()) { return drawable->getDisplayList(contextID) != 0; } return true; } inline bool isCompiled(const osg::Drawable* drawable) const { if (drawable->getUseDisplayList()) { for (ActiveGraphicsContexts::const_iterator iter=_activeGraphicsContexts.begin(); iter!=_activeGraphicsContexts.end(); ++iter ) { if ( drawable->getDisplayList(*iter) == 0 ) return false; } } return true; } /** Iterate through the active PagedLOD nodes children removing * children which havn't been visited since specified expiryTime. * note, should be only be called from the update thread. */ virtual void removeExpiredSubgraphs(double currentFrameTime); /** Add the loaded data to the scene graph.*/ void addLoadedDataToSceneGraph(double currentFrameTime); bool _done; bool _acceptNewRequests; bool _databasePagerThreadPaused; DatabaseThreadList _databaseThreads; int _numFramesActive; mutable OpenThreads::Mutex _numFramesActiveMutex; int _frameNumber; osg::ref_ptr _fileRequestQueue; osg::ref_ptr _httpRequestQueue; osg::ref_ptr _dataToCompileList; DrawablePolicy _drawablePolicy; bool _changeAutoUnRef; bool _valueAutoUnRef; bool _changeAnisotropy; float _valueAnisotropy; bool _deleteRemovedSubgraphsInDatabaseThread; osg::ref_ptr _dataToMergeList; PagedLODList _pagedLODList; double _expiryDelay; ActiveGraphicsContexts _activeGraphicsContexts; // CompileGraphicsContexts _compileGraphicsContexts; bool _doPreCompile; double _targetFrameRate; double _minimumTimeAvailableForGLCompileAndDeletePerFrame; unsigned int _maximumNumOfObjectsToCompilePerFrame; double _minimumTimeToMergeTile; double _maximumTimeToMergeTile; double _totalTimeToMergeTiles; unsigned int _numTilesMerges; struct CompileOperation : public osg::GraphicsOperation { CompileOperation(DatabasePager* databasePager); virtual void operator () (osg::GraphicsContext* context); osg::observer_ptr _databasePager; }; }; } #endif