Robert,
Here is a sample program that crashes when loading earth.ive the second
time. I'm using OSG 2.8.2.
Thanks,
Brett
main()
{
std::string modelPath = "earth.ive";
// create a scene graph (and keep it around).
osg::ref_ptr<osg::Node> modelNode = osgDB::readNodeFile(modelPath);
// create viewer1 and set the scene graph data.
osgViewer::Viewer* viewer1 = new osgViewer::Viewer;
viewer1->setUpViewOnSingleScreen(0);
viewer1->setSceneData(modelNode.get());
viewer1->setCameraManipulator(new osgGA::TrackballManipulator());
// render a frame
viewer1->realize();
while(!viewer1->done())
{
viewer1->frame();
}
// delete viewer1.
delete viewer1;
viewer1 = 0;
// create viewer2 and set the scene graph data.
osgViewer::Viewer* viewer2 = new osgViewer::Viewer;
viewer2->setUpViewOnSingleScreen(0);
viewer2->setSceneData(modelNode.get());
viewer2->setCameraManipulator(new osgGA::TrackballManipulator());
// render a frame
viewer2->realize();
while(!viewer2->done())
{
viewer2->frame();
}
// check that it has textures.
// delete viewer2.
delete viewer2;
viewer2 = 0;
}
Robert Osfield wrote:
Hi Colin,
You make no mention of which version of the OSG you are using. The
DatabasePager and manage of GL objects when destroying contexts has
improved significantly over the past year so the problems you are
seeing may well be already resolved.
Robert.
On Thu, Jan 14, 2010 at 5:00 PM, Colin Branch <[email protected]> wrote:
Greetings,
Here's my steps:
I'm creating a compositeViewer with one or more views.
I'm loading a paged database.
While the database is paging, I delete the compositeViewer (thus taking the
context down with it as well as the database pager).
I then create a new compositeViewer and attempt to render the sane database
(same nodes).
I'm getting a crash in the database pager, specifically it crash in the
requestNodeFile function due to crashing on accessing invalid memory.
The problem seems to step from the PagedLOD having a ref_ptr to a
DatabasePager::DatabaseRequest.
The databaseRequest has a raw pointer to a RequestQueue.
The RequestQueue is invalid (as it is a referenced member of the original
database pager, and thus is already deleted, but the DB request stayed
alive).
There appears to be no way of clearing the databaseRequest which is
referenced in the PagedLOD node.
This appears to be a problem with how OSG handles database paging, probably
a bug. No obvious solution pops out, mainly due to the low level nature of
the problem.
This is an important issue since it affects one of our customers.
I welcome any comments/suggestions/workarounds.
Thank you and best regards,
Colin Branch
--
Colin Branch
VT MAK
work: (617) 876-8085 Ext. 159
email: [email protected]
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