FGFS-4.1/OpenSceneGraph
4
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Refactored the MultiTextureControl node callback so that the update is now

Browse Source 
done as an update callback, with the elevation aquired via a cull callback
This commit is contained in:
Robert Osfield 2008-07-16 15:58:15 +00:00
parent 270a671c75
commit b068777c22
1 changed files with 66 additions and 64 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

60
examples/osgmultitexturecontrol/osgmultitexturecontrol.cpp
View File

@ -92,6 +92,7 @@ class ElevationLayerBlendingCallback : public osg::NodeCallback
ElevationLayerBlendingCallback(osgFX::MultiTextureControl* mtc, const Elevations& elevations, float animationTime=4.0f):
_previousFrame(-1),
_previousTime(0.0),
_currentElevation(0.0),
_mtc(mtc),
_elevations(elevations),
_animationTime(animationTime) {}
@ -99,14 +100,8 @@ class ElevationLayerBlendingCallback : public osg::NodeCallback
/** Callback method called by the NodeVisitor when visiting a node.*/
virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
{
if (!nv->getFrameStamp() || _previousFrame==nv->getFrameStamp()->getFrameNumber())
if (nv->getVisitorType()==osg::NodeVisitor::UPDATE_VISITOR)
{
// we've already updated for this frame so no need to do it again, just traverse children.
traverse(node,nv);
return;
}
OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_mutex);
float deltaTime = 0.01f;
if (_previousFrame!=-1)
@ -117,28 +112,12 @@ class ElevationLayerBlendingCallback : public osg::NodeCallback
_previousTime = nv->getFrameStamp()->getReferenceTime();
_previousFrame = nv->getFrameStamp()->getFrameNumber();
double elevation = nv->getViewPoint().z();
osg::CoordinateSystemNode* csn = dynamic_cast<osg::CoordinateSystemNode*>(node);
if (csn)
{
osg::EllipsoidModel* em = csn->getEllipsoidModel();
if (em)
{
double X = nv->getViewPoint().x();
double Y = nv->getViewPoint().y();
double Z = nv->getViewPoint().z();
double latitude, longitude;
em->convertXYZToLatLongHeight(X,Y,Z,latitude, longitude, elevation);
}
}
if (_mtc.valid() && !_elevations.empty())
{
unsigned int index = _mtc->getNumTextureWeights()-1;
for(unsigned int i=0; i<_elevations.size(); ++i)
{
if (elevation>_elevations[i])
if (_currentElevation>_elevations[i])
{
index = i;
break;
@ -167,6 +146,26 @@ class ElevationLayerBlendingCallback : public osg::NodeCallback
}
}
}
else if (nv->getVisitorType()==osg::NodeVisitor::CULL_VISITOR)
{
_currentElevation = nv->getViewPoint().z();
osg::CoordinateSystemNode* csn = dynamic_cast<osg::CoordinateSystemNode*>(node);
if (csn)
{
osg::EllipsoidModel* em = csn->getEllipsoidModel();
if (em)
{
double X = nv->getViewPoint().x();
double Y = nv->getViewPoint().y();
double Z = nv->getViewPoint().z();
double latitude, longitude;
em->convertXYZToLatLongHeight(X,Y,Z,latitude, longitude, _currentElevation);
}
}
}
traverse(node,nv);
}
@ -174,10 +173,10 @@ class ElevationLayerBlendingCallback : public osg::NodeCallback
int _previousFrame;
double _previousTime;
float _animationTime;
double _currentElevation;
osg::observer_ptr<osgFX::MultiTextureControl> _mtc;
Elevations _elevations;
OpenThreads::Mutex _mutex;
};
@ -353,9 +352,12 @@ int main( int argc, char **argv )
ElevationLayerBlendingCallback* elbc = new ElevationLayerBlendingCallback(mtc, elevations);
// assign to the most appropriate node (the CoordinateSystemNode is best as it provides the elevation on the globe.)
if (csn) csn->setCullCallback(elbc);
else if (mtc) mtc->setCullCallback(elbc);
else rootnode->setCullCallback(elbc);
// note we must assign callback as both an update and cull callback, as update callback to do the update of
// the the osgFX::MultiTextureControl node a thread safe way, and as a cull callback to gather the camera
// position information.
osg::Node* nodeToAssignCallbackTo = csn ? csn : (mtc ? mtc : rootnode);
nodeToAssignCallbackTo->setUpdateCallback(elbc);
nodeToAssignCallbackTo->setCullCallback(elbc);
// add a viewport to the viewer and attach the scene graph.
viewer.setSceneData( rootnode );