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Refactored the MultiTextureControl node callback so that the update is now

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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
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130
examples/osgmultitexturecontrol/osgmultitexturecontrol.cpp
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@ -92,92 +92,91 @@ 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) {}
/** 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)
{
deltaTime = float(nv->getFrameStamp()->getReferenceTime() - _previousTime);
}
_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)
float deltaTime = 0.01f;
if (_previousFrame!=-1)
{
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);
deltaTime = float(nv->getFrameStamp()->getReferenceTime() - _previousTime);
}
_previousTime = nv->getFrameStamp()->getReferenceTime();
_previousFrame = nv->getFrameStamp()->getFrameNumber();
if (_mtc.valid() && !_elevations.empty())
{
unsigned int index = _mtc->getNumTextureWeights()-1;
for(unsigned int i=0; i<_elevations.size(); ++i)
{
if (_currentElevation>_elevations[i])
{
index = i;
break;
}
}
float delta = std::min(deltaTime/_animationTime, 1.0f);
for(unsigned int i=0; i<_mtc->getNumTextureWeights(); ++i)
{
float currentValue = _mtc->getTextureWeight(i);
float desiredValue = (i==index) ? 1.0f : 0.0f;
if (desiredValue != currentValue)
{
if (currentValue<desiredValue)
{
desiredValue = std::min(currentValue + delta, desiredValue);
}
else
{
desiredValue = std::max(currentValue - delta, desiredValue);
}
_mtc->setTextureWeight(i, desiredValue);
}
}
}
}
if (_mtc.valid() && !_elevations.empty())
else if (nv->getVisitorType()==osg::NodeVisitor::CULL_VISITOR)
{
unsigned int index = _mtc->getNumTextureWeights()-1;
for(unsigned int i=0; i<_elevations.size(); ++i)
_currentElevation = nv->getViewPoint().z();
osg::CoordinateSystemNode* csn = dynamic_cast<osg::CoordinateSystemNode*>(node);
if (csn)
{
if (elevation>_elevations[i])
osg::EllipsoidModel* em = csn->getEllipsoidModel();
if (em)
{
index = i;
break;
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);
}
}
float delta = std::min(deltaTime/_animationTime, 1.0f);
for(unsigned int i=0; i<_mtc->getNumTextureWeights(); ++i)
{
float currentValue = _mtc->getTextureWeight(i);
float desiredValue = (i==index) ? 1.0f : 0.0f;
if (desiredValue != currentValue)
{
if (currentValue<desiredValue)
{
desiredValue = std::min(currentValue + delta, desiredValue);
}
else
{
desiredValue = std::max(currentValue - delta, desiredValue);
}
_mtc->setTextureWeight(i, desiredValue);
}
}
}
traverse(node,nv);
}
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 );