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OpenSceneGraph/include/osgDB/DatabasePager

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/* -*-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 <osg/NodeVisitor>
#include <osg/Group>
#include <osg/PagedLOD>
#include <osg/Drawable>
#include <osg/GraphicsThread>
#include <osg/FrameStamp>
#include <osg/ObserverNodePath>
#include <osg/observer_ptr>
#include <OpenThreads/Thread>
#include <OpenThreads/Mutex>
#include <OpenThreads/ScopedLock>
#include <OpenThreads/Condition>
#include <osgUtil/IncrementalCompileOperation>
#include <osgDB/SharedStateManager>
#include <osgDB/ReaderWriter>
#include <osgDB/Options>
#include <map>
#include <list>
#include <algorithm>
#include <functional>
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);
virtual const char* className() const { return "DatabasePager"; }
/** 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<DatabasePager>& 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::NodePath& nodePath,
float priority, const osg::FrameStamp* framestamp,
osg::ref_ptr<osg::Referenced>& databaseRequest,
const osg::Referenced* options);
/** 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 setName(const std::string& name) { _name = name; }
const std::string& getName() const { return _name; }
void setDone(bool done) { _done.exchange(done?1:0); }
bool getDone() const { return _done!=0; }
void setActive(bool active) { _active = active; }
bool getActive() const { return _active; }
virtual int cancel();
virtual void run();
protected:
virtual ~DatabaseThread();
OpenThreads::Atomic _done;
volatile bool _active;
DatabasePager* _pager;
Mode _mode;
std::string _name;
};
void setUpThreads(unsigned int totalNumThreads=2, unsigned int numHttpThreads=1);
unsigned int addDatabaseThread(DatabaseThread::Mode mode, const 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, unsigned int frameNumber = 0);
/** Set the incremental compile operation.
* Used to manage the OpenGL object compilation and merging of subgraphs in a way that avoids overloading
* the rendering of frame with too many new objects in one frame. */
void setIncrementalCompileOperation(osgUtil::IncrementalCompileOperation* ico);
/** Get the incremental compile operation. */
osgUtil::IncrementalCompileOperation* getIncrementalCompileOperation() { return _incrementalCompileOperation.get(); }
/** 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 maximum number of PagedLOD to maintain in memory.
* Note, if more than the target number are required for rendering of a frame then these active PagedLOD are excempt from being expiried.
* But once the number of active drops back below the target the inactive PagedLOD will be trimmed back to the target number.*/
void setTargetMaximumNumberOfPageLOD(unsigned int target) { _targetMaximumNumberOfPageLOD = target; }
/** Get the target maximum number of PagedLOD to maintain in memory.*/
unsigned int getTargetMaximumNumberOfPageLOD() const { return _targetMaximumNumberOfPageLOD; }
/** 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(const osg::FrameStamp& frameStamp);
/** Report how many items are in the _fileRequestList queue */
unsigned int getFileRequestListSize() const { return _fileRequestQueue->size() + _httpRequestQueue->size(); }
/** Report how many items are in the _dataToCompileList queue */
unsigned int getDataToCompileListSize() const { return _dataToCompileList->size(); }
/** Report how many items are in the _dataToMergeList queue */
unsigned int getDataToMergeListSize() const { return _dataToMergeList->size(); }
/** Report whether any requests are in the pager.*/
bool getRequestsInProgress() const;
/** 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 (_numTilesMerges > 0) ? _totalTimeToMergeTiles/static_cast<double>(_numTilesMerges) : 0; }
/** Reset the Stats variables.*/
void resetStats();
typedef std::set< osg::ref_ptr<osg::StateSet> > StateSetList;
typedef std::vector< osg::ref_ptr<osg::Drawable> > DrawableList;
class CountPagedLODsVisitor;
typedef std::list< osg::ref_ptr<osg::Object> > ObjectList;
struct PagedLODList : public osg::Referenced
{
virtual PagedLODList* clone() = 0;
virtual void clear() = 0;
virtual unsigned int size() = 0;
virtual void removeExpiredChildren(int numberChildrenToRemove, double expiryTime, unsigned int expiryFrame, ObjectList& childrenRemoved, bool visitActive) = 0;
virtual void removeNodes(osg::NodeList& nodesToRemove) = 0;
virtual void insertPagedLOD(const osg::observer_ptr<osg::PagedLOD>& plod) = 0;
virtual bool containsPagedLOD(const osg::observer_ptr<osg::PagedLOD>& plod) const = 0;
};
protected:
virtual ~DatabasePager();
friend class DatabaseThread;
friend struct DatabaseRequest;
struct RequestQueue;
struct OSGDB_EXPORT DatabaseRequest : public osg::Referenced
{
DatabaseRequest():
osg::Referenced(true),
_valid(false),
_frameNumberFirstRequest(0),
_timestampFirstRequest(0.0),
_priorityFirstRequest(0.f),
_frameNumberLastRequest(0),
_timestampLastRequest(0.0),
_priorityLastRequest(0.0f),
_numOfRequests(0)
{}
void invalidate();
bool valid() const { return _valid; }
bool _valid;
std::string _fileName;
unsigned int _frameNumberFirstRequest;
double _timestampFirstRequest;
float _priorityFirstRequest;
unsigned int _frameNumberLastRequest;
double _timestampLastRequest;
float _priorityLastRequest;
unsigned int _numOfRequests;
osg::observer_ptr<osg::Node> _terrain;
osg::observer_ptr<osg::Group> _group;
osg::ref_ptr<osg::Node> _loadedModel;
osg::ref_ptr<Options> _loadOptions;
osg::observer_ptr<osgUtil::IncrementalCompileOperation::CompileSet> _compileSet;
bool isRequestCurrent (int frameNumber) const
{
return _valid && (frameNumber - _frameNumberLastRequest <= 1);
}
};
struct OSGDB_EXPORT RequestQueue : public osg::Referenced
{
public:
RequestQueue(DatabasePager* pager);
void add(DatabaseRequest* databaseRequest);
void remove(DatabaseRequest* databaseRequest);
void addNoLock(DatabaseRequest* databaseRequest);
void takeFirst(osg::ref_ptr<DatabaseRequest>& databaseRequest);
/// prune all the old requests and then return true if requestList left empty
bool pruneOldRequestsAndCheckIfEmpty();
virtual void updateBlock() {}
void invalidate(DatabaseRequest* dr);
bool empty();
unsigned int size();
void clear();
typedef std::list< osg::ref_ptr<DatabaseRequest> > RequestList;
void swap(RequestList& requestList);
DatabasePager* _pager;
RequestList _requestList;
OpenThreads::Mutex _requestMutex;
unsigned int _frameNumberLastPruned;
protected:
virtual ~RequestQueue();
};
typedef std::vector< osg::ref_ptr<DatabaseThread> > DatabaseThreadList;
struct OSGDB_EXPORT ReadQueue : public RequestQueue
{
ReadQueue(DatabasePager* pager, const std::string& name);
void block() { _block->block(); }
void release() { _block->release(); }
virtual void updateBlock();
osg::ref_ptr<osg::RefBlock> _block;
std::string _name;
OpenThreads::Mutex _childrenToDeleteListMutex;
ObjectList _childrenToDeleteList;
};
// forward declare inner helper classes
class FindCompileableGLObjectsVisitor;
friend class FindCompileableGLObjectsVisitor;
struct DatabasePagerCompileCompletedCallback;
friend struct DatabasePagerCompileCompletedCallback;
class FindPagedLODsVisitor;
friend class FindPagedLODsVisitor;
struct SortFileRequestFunctor;
friend struct SortFileRequestFunctor;
OpenThreads::Mutex _run_mutex;
OpenThreads::Mutex _dr_mutex;
bool _startThreadCalled;
void compileCompleted(DatabaseRequest* databaseRequest);
/** 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(const osg::FrameStamp &frameStamp);
/** Add the loaded data to the scene graph.*/
void addLoadedDataToSceneGraph(const osg::FrameStamp &frameStamp);
bool _done;
bool _acceptNewRequests;
bool _databasePagerThreadPaused;
DatabaseThreadList _databaseThreads;
int _numFramesActive;
mutable OpenThreads::Mutex _numFramesActiveMutex;
OpenThreads::Atomic _frameNumber;
osg::ref_ptr<ReadQueue> _fileRequestQueue;
osg::ref_ptr<ReadQueue> _httpRequestQueue;
osg::ref_ptr<RequestQueue> _dataToCompileList;
osg::ref_ptr<RequestQueue> _dataToMergeList;
DrawablePolicy _drawablePolicy;
bool _changeAutoUnRef;
bool _valueAutoUnRef;
bool _changeAnisotropy;
float _valueAnisotropy;
bool _deleteRemovedSubgraphsInDatabaseThread;
osg::ref_ptr<PagedLODList> _activePagedLODList;
unsigned int _targetMaximumNumberOfPageLOD;
bool _doPreCompile;
osg::ref_ptr<osgUtil::IncrementalCompileOperation> _incrementalCompileOperation;
double _minimumTimeToMergeTile;
double _maximumTimeToMergeTile;
double _totalTimeToMergeTiles;
unsigned int _numTilesMerges;
};
}
#endif
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