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OpenSceneGraph/include/osgDB/DatabasePager
Robert Osfield 988c69bba3 From Csaba Halasz, "here is another division by zero fix, this should be simpler ;) 
It caused problem if the stats display was popped up before the pager
had anything to do."
2009-03-23 15:47:01 +00:00

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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 <OpenThreads/Thread>
#include <OpenThreads/Mutex>
#include <OpenThreads/ScopedLock>
#include <OpenThreads/Condition>
#include <osgDB/SharedStateManager>
#include <osgDB/ReaderWriter>
#include <osgDB/Export>
#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);
/** 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::Group* group,
float priority, const osg::FrameStamp* framestamp,
osg::ref_ptr<osg::Referenced>& databaseRequest);
virtual void requestNodeFile(const std::string& fileName,osg::Group* group,
float priority, const osg::FrameStamp* framestamp,
osg::ref_ptr<osg::Referenced>& 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; }
void setActive(bool active) { _active = active; }
bool getActive() const { return _active; }
virtual int cancel();
virtual void run();
protected:
virtual ~DatabaseThread();
bool _done;
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, int frameNumber = 0);
/** 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 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; }
/** Deprecated.*/
void setExpiryDelay(double expiryDelay) { _expiryDelay = expiryDelay; }
/** Deprecated.*/
double getExpiryDelay() const { return _expiryDelay; }
/** Deprecated.*/
void setExpiryFrames(int expiryFrames) { _expiryFrames = expiryFrames; }
/** Deprecated.*/
int getExpiryFrames() const { return _expiryFrames; }
/** Deprecated.*/
void setReleaseDelay(double releaseDelay);
/** Deprecated.*/
double getReleaseDelay() const { return _releaseDelay; }
/** Deprecated.*/
void setReleaseFrames(int releaseFrames) { _releaseFrames = releaseFrames; }
/** Deprecated.*/
int getReleaseFrames() const { return _releaseFrames; }
/** 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)
{
removeExpiredSubgraphs(frameStamp);
addLoadedDataToSceneGraph(frameStamp);
}
/** 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(); }
/** Report how many items are in the _dataToCompileList queue */
unsigned int getDataToMergeListSize() const { return _dataToMergeList->_requestList.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::list< osg::ref_ptr<osg::PagedLOD> > PagedLODList;
typedef std::set< osg::ref_ptr<osg::StateSet> > StateSetList;
typedef std::vector< osg::ref_ptr<osg::Drawable> > DrawableList;
typedef std::pair<StateSetList,DrawableList> DataToCompile;
typedef std::map< unsigned int, DataToCompile > DataToCompileMap;
typedef std::set<unsigned int> ActiveGraphicsContexts;
typedef std::vector< osg::observer_ptr<osg::GraphicsContext> > 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<osg::Group> _groupForAddingLoadedSubgraph;
osg::ref_ptr<osg::Node> _loadedModel;
DataToCompileMap _dataToCompileMap;
osg::ref_ptr<ReaderWriter::Options> _loadOptions;
RequestQueue* _requestQueue;
bool isRequestCurrent (int frameNumber) const
{
return frameNumber - _frameNumberLastRequest <= 1;
}
};
struct RequestQueue : public osg::Referenced
{
typedef std::vector< osg::ref_ptr<DatabaseRequest> > RequestList;
void sort();
RequestList _requestList;
OpenThreads::Mutex _requestMutex;
};
typedef std::vector< osg::ref_ptr<DatabaseThread> > DatabaseThreadList;
typedef std::vector< osg::ref_ptr<osg::Object> > 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>& databaseRequest);
osg::ref_ptr<osg::RefBlock> _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<const osg::Texture*>(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<osg::Texture*>(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(const osg::FrameStamp &frameStamp);
/** Old expiry delay based removeExpiredSubgraphs. */
virtual void expiry_removeExpiredSubgraphs(const osg::FrameStamp &frameStamp);
/** New capped based removeExpiredSubgraphs. */
virtual void capped_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;
int _frameNumber;
osg::ref_ptr<ReadQueue> _fileRequestQueue;
osg::ref_ptr<ReadQueue> _httpRequestQueue;
osg::ref_ptr<RequestQueue> _dataToCompileList;
DrawablePolicy _drawablePolicy;
bool _changeAutoUnRef;
bool _valueAutoUnRef;
bool _changeAnisotropy;
float _valueAnisotropy;
bool _deleteRemovedSubgraphsInDatabaseThread;
osg::ref_ptr<RequestQueue> _dataToMergeList;
PagedLODList _activePagedLODList;
PagedLODList _inactivePagedLODList;
unsigned int _targetMaximumNumberOfPageLOD;
double _expiryDelay;
int _expiryFrames;
double _releaseDelay;
int _releaseFrames;
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> _databasePager;
};
};
}
#endif
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