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From Maceij Krol, "I have implement frame based expiration of PagedLOD children.

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New attribute DatabasePager::_expiryFrames sets number of frames a PagedLOD child is kept in memory. The attribute is set with DatabasePager::setExpiryFrames method or OSG_EXPIRY_FRAMES environmental variable.

New attribute PagedLOD::PerRangeData::_
frameNumber contains frame number of last cull traversal.

Children of PagedLOD are expired when time _AND_ number of frames since last cull traversal exceed OSG_EXPIRY_DELAY _AND_ OSG_EXPIRY_FRAMES respectively. By default OSG_EXPIRY_FRAMES = 1 which means that nodes from last cull/rendering
traversal will not be expired even if last cull time exceeds OSG_EXPIRY_DELAY. Setting OSG_EXPIRY_FRAMES = 0 revokes previous behaviour of PagedLOD.

Setting OSG_EXPIRY_FRAMES > 0 fixes problems of children reloading in lazy rendering applications. Required behaviour is achieved by manipulating OSG_EXPIRY_DELAY and OSG_EXPIRY_FRAMES together.

Two interface changes are made:

DatabasePager::updateSceneGraph(double currentFrameTime) is replaced by DatabasePager::updateSceneGraph(const osg::FrameStamp &frameStamp). The previous method is in #if 0 clause in the header file. Robert, decide if You want to include it.

PagedLOD::removeExpiredChildren(double expiryTime, NodeList &removedChildren) is deprecated (warning is printed), when subclassing use PagedLOD::removeExpiredChildren(double expiryTime, int expiryFrame, NodeList &removedChildren) instead. "
This commit is contained in:
Robert Osfield
2008-08-17 16:52:35 +00:00
parent 0c234e7997
commit 3de3b2dccc
8 changed files with 69 additions and 28 deletions
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25
src/osgDB/DatabasePager.cpp
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@@ -45,6 +45,7 @@ static osg::ApplicationUsageProxy DatabasePager_e2(osg::ApplicationUsage::ENVIRO
static osg::ApplicationUsageProxy DatabasePager_e3(osg::ApplicationUsage::ENVIRONMENTAL_VARIABLE,"OSG_DATABASE_PAGER_DRAWABLE <mode>","Set the drawable policy for setting of loaded drawable to specified type. mode can be one of DoNotModify, DisplayList, VBO or VertexArrays>.");
static osg::ApplicationUsageProxy DatabasePager_e4(osg::ApplicationUsage::ENVIRONMENTAL_VARIABLE,"OSG_DATABASE_PAGER_PRIORITY <mode>", "Set the thread priority to DEFAULT, MIN, LOW, NOMINAL, HIGH or MAX.");
static osg::ApplicationUsageProxy DatabasePager_e7(osg::ApplicationUsage::ENVIRONMENTAL_VARIABLE,"OSG_EXPIRY_DELAY <float> ","Set the length of time a PagedLOD child is kept in memory, without being used, before its tagged as expired, and ear marked to deletion.");
static osg::ApplicationUsageProxy DatabasePager_e8(osg::ApplicationUsage::ENVIRONMENTAL_VARIABLE,"OSG_EXPIRY_FRAMES <int> ","Set number of frames a PagedLOD child is kept in memory, without being used, before its tagged as expired, and ear marked to deletion.");
// Convert function objects that take pointer args into functions that a
// reference to an osg::ref_ptr. This is quite useful for doing STL
// operations on lists of ref_ptr. This code assumes that a function
@@ -901,6 +902,13 @@ DatabasePager::DatabasePager()
osg::notify(osg::NOTICE)<<"Expiry delay = "<<_expiryDelay<<std::endl;
}
_expiryFrames = 1; // Last frame will not be expired
if( (ptr = getenv("OSG_EXPIRY_FRAMES")) != 0)
{
_expiryFrames = atoi(ptr);
osg::notify(osg::NOTICE)<<"Expiry frames = "<<_expiryFrames<<std::endl;
}
_doPreCompile = true;
if( (ptr = getenv("OSG_DO_PRE_COMPILE")) != 0)
{
@@ -977,6 +985,7 @@ DatabasePager::DatabasePager(const DatabasePager& rhs)
_deleteRemovedSubgraphsInDatabaseThread = rhs._deleteRemovedSubgraphsInDatabaseThread;
_expiryDelay = rhs._expiryDelay;
_expiryFrames = rhs._expiryFrames;
_doPreCompile = rhs._doPreCompile;
_targetFrameRate = rhs._targetFrameRate;
_minimumTimeAvailableForGLCompileAndDeletePerFrame = rhs._minimumTimeAvailableForGLCompileAndDeletePerFrame;
@@ -1287,8 +1296,10 @@ bool DatabasePager::requiresUpdateSceneGraph() const
}
void DatabasePager::addLoadedDataToSceneGraph(double timeStamp)
void DatabasePager::addLoadedDataToSceneGraph(const osg::FrameStamp &frameStamp)
{
double timeStamp = frameStamp.getReferenceTime();
int frameNumber = frameStamp.getFrameNumber();
// osg::Timer_t before = osg::Timer::instance()->tick();
@@ -1321,7 +1332,8 @@ void DatabasePager::addLoadedDataToSceneGraph(double timeStamp)
osg::PagedLOD* plod = dynamic_cast<osg::PagedLOD*>(group.get());
if (plod)
{
plod->setTimeStamp(plod->getNumChildren(),timeStamp);
plod->setTimeStamp(plod->getNumChildren(), timeStamp);
plod->setFrameNumber(plod->getNumChildren(), frameNumber);
plod->getDatabaseRequest(plod->getNumChildren()) = 0;
}
else
@@ -1375,11 +1387,12 @@ public:
std::string _marker;
};
void DatabasePager::removeExpiredSubgraphs(double currentFrameTime)
void DatabasePager::removeExpiredSubgraphs(const osg::FrameStamp &frameStamp)
{
// osg::notify(osg::NOTICE)<<"DatabasePager::new_removeExpiredSubgraphs()"<<std::endl;
double expiryTime = currentFrameTime - _expiryDelay;
double expiryTime = frameStamp.getReferenceTime() - _expiryDelay;
int expiryFrame = frameStamp.getFrameNumber() - _expiryFrames;
osg::NodeList childrenRemoved;
@@ -1388,7 +1401,7 @@ void DatabasePager::removeExpiredSubgraphs(double currentFrameTime)
++itr)
{
osg::PagedLOD* plod = itr->get();
plod->removeExpiredChildren(expiryTime,childrenRemoved);
plod->removeExpiredChildren(expiryTime, expiryFrame, childrenRemoved);
}
if (!childrenRemoved.empty())
@@ -1445,7 +1458,7 @@ void DatabasePager::removeExpiredSubgraphs(double currentFrameTime)
osgDB::Registry::instance()->getSharedStateManager()->prune();
// update the Registry object cache.
osgDB::Registry::instance()->updateTimeStampOfObjectsInCacheWithExternalReferences(currentFrameTime);
osgDB::Registry::instance()->updateTimeStampOfObjectsInCacheWithExternalReferences(frameStamp.getReferenceTime());
osgDB::Registry::instance()->removeExpiredObjectsInCache(expiryTime);

2
src/osgDB/ImagePager.cpp
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@@ -326,7 +326,7 @@ bool ImagePager::requiresUpdateSceneGraph() const
return !(_completedQueue->_requestList.empty());
}
void ImagePager::updateSceneGraph(double currentFrameTime)
void ImagePager::updateSceneGraph(const osg::FrameStamp &frameStamp)
{
OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_completedQueue->_requestMutex);