FGFS-4.1/OpenSceneGraph
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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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4
src/osgViewer/CompositeViewer.cpp
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@@ -971,13 +971,13 @@ void CompositeViewer::updateTraversal()
if (scene->getDatabasePager())
{
// synchronize changes required by the DatabasePager thread to the scene graph
scene->getDatabasePager()->updateSceneGraph(_frameStamp->getReferenceTime());
scene->getDatabasePager()->updateSceneGraph(*_frameStamp);
}
if (scene->getImagePager())
{
// synchronize changes required by the DatabasePager thread to the scene graph
scene->getImagePager()->updateSceneGraph(_frameStamp->getReferenceTime());
scene->getImagePager()->updateSceneGraph(*_frameStamp);
}
}