Hi,
I add some code fragments to point out whats going on. (thread a is app,
thread b is gui/rendering)
----------- Startup phase -------------
Thread A:
OSG::Init()
Thread B:
OSG::ExternalThread::get("GUIThread")->initialize(1) // Use aspect 1
// Wait for app thread to run into update() and be ready for sync
OSG::Barrier::get("ModelSyncBarrier")->enter(2);
(dynamic_cast<OSG::Thread
*>(OSG::ThreadManager::getAppThread()))->getChangeList()->applyAndClear();
OSG::Barrier::get("ModelSyncBarrier")->enter(2);
Thread A: relevant code to show that setup navigation / rendering is
going on
_pRenderAction = OSG::RenderAction::create();
// Don't draw or test any object taking up less than 15 pixels
_pRenderAction->setOcclusionCullingMinimumFeatureSize(15);
...
_pNavigator->setMode(OSG::Navigator::TRACKBALL);
// will not work because the port of the passive window is not yet
initialized/used
// currently this is being worked around by setting it again in redraw()
_pNavigator->setViewport(_pWin->getPort(0));
_pNavigator->setCameraTransformation(pCart);
_pNavigator->updateCameraTransformation();
...
Thread A: this is the relevant code in update()
if (m_syncForRenderingNeeded)
{
if (_pNavigator)
_pNavigator->updateCameraTransformation();
OSG::commitChanges();
m_syncBarrierP->enter(2);
m_syncBarrierP->enter(2);
m_syncForRenderingNeeded = false;
}
----------- Running phase, update() is called continuously by the app
core -------------
Thread B: redraw()
m_syncForRenderingNeeded = true;
m_syncBarrierP->enter(2);
m_appThreadP->getChangeList()->applyAndClear();
m_syncBarrierP->enter(2);
OSG::commitChanges();
Thread A:
update()
----------- Model loading -------------
Thread A: loadModel()
...
OSG::NodeMTRefPtr pNewNode = OSG::Node::create();
OSG::GroupMTRefPtr g = OSG::Group::create();
pNewNode->setCore(g);
pNewNode->addChild(OSG::SceneFileHandler::the()->read(file.c_str()));
pParentNode->addChild(pNewNode);
setRoot(pParentNode);
showAll();
...
Thread B:
redraw()
Thread A:
update()
Cheers,
Christoph
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