FGFS-4.1/OpenSceneGraph
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Added support for specifying whether view frustum and small feature culling

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should be applied to a node or its child with the new osg::Node::setCullingActive()
flag.  A mechanism has been implemented so that if child has its culling disabled
then their parents, all the way up to the root are also have their culling
implicitly disabled.

The osg::CullVisitor has updated to take account of
both the explicit control via setCullingActive and the implicit culling
disabling through children being disabled.

This feature is useful for nodes which don't have a bounding volume to cull
against, earth sky implementations and light sources.

The default osg::Node::_cullingActive is true, i.e. culling is enabled by
default.
This commit is contained in:
Robert Osfield
2001-10-19 12:56:37 +00:00
parent e467f44575
commit 54d490e24b
5 changed files with 209 additions and 10 deletions
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23
include/osg/Node
View File

@@ -105,6 +105,20 @@ class SG_EXPORT Node : public Object
* since they have an AppCallback attached to them or their children.*/
inline const int getNumChildrenRequiringAppTraversal() const { return _numChildrenRequiringAppTraversal; }
/** Set the view frustum/small feature culling of this node to be active or inactive.
* The default value to true for _cullingActive. Used a guide
* to the cull traversal.*/
void setCullingActive(const bool active);
/** Get the view frustum/small feature _cullingActive flag. Used a guide
* to the cull traversal.*/
inline const bool getCullingActive() const { return _cullingActive; }
/** Get the number of Children of this node which have culling disabled.*/
inline const int getNumChildrenWithCullingDisabled() const { return _numChildrenWithCullingDisabled; }
/**
* Set user data. See MemoryAdapter documentation for details
* of how to specify memory management of _userData.
@@ -201,11 +215,14 @@ class SG_EXPORT Node : public Object
ParentList _parents;
friend Group;
ref_ptr<NodeCallback> _appCallback;
int _numChildrenRequiringAppTraversal;
ref_ptr<NodeCallback> _appCallback;
int _numChildrenRequiringAppTraversal;
void setNumChildrenRequiringAppTraversal(const int num);
bool _cullingActive;
int _numChildrenWithCullingDisabled;
void setNumChildrenWithCullingDisabled(const int num);
void* _userData;
ref_ptr<MemoryAdapter> _memoryAdapter;

62
src/osg/Group.cpp
View File

@@ -62,6 +62,16 @@ bool Group::addChild( Node *child )
);
}
// could now require disabling of culling thanks to the new subgraph,
// so need to check and update if required.
if (child->getNumChildrenWithCullingDisabled()>0 ||
!child->getCullingActive())
{
setNumChildrenWithCullingDisabled(
getNumChildrenWithCullingDisabled()+1
);
}
return true;
}
else return false;
@@ -89,6 +99,14 @@ bool Group::removeChild( Node *child )
);
}
if (child->getNumChildrenWithCullingDisabled()>0 ||
!child->getCullingActive())
{
setNumChildrenWithCullingDisabled(
getNumChildrenWithCullingDisabled()-1
);
}
// note ref_ptr<> automatically handles decrementing child's reference count.
_children.erase(itr);
dirtyBound();
@@ -118,6 +136,50 @@ bool Group::replaceChild( Node *origNode, Node *newNode )
newNode->_parents.push_back(this);
dirtyBound();
// could now require app traversal thanks to the new subgraph,
// so need to check and update if required.
int delta_numChildrenRequiringAppTraversal = 0;
if (origNode->getNumChildrenRequiringAppTraversal()>0 ||
origNode->getAppCallback())
{
--delta_numChildrenRequiringAppTraversal;
}
if (newNode->getNumChildrenRequiringAppTraversal()>0 ||
newNode->getAppCallback())
{
++delta_numChildrenRequiringAppTraversal;
}
if (delta_numChildrenRequiringAppTraversal!=0)
{
setNumChildrenRequiringAppTraversal(
getNumChildrenRequiringAppTraversal()+delta_numChildrenRequiringAppTraversal
);
}
// could now require disabling of culling thanks to the new subgraph,
// so need to check and update if required.
int delta_numChildrenWithCullingDisabled = 0;
if (origNode->getNumChildrenWithCullingDisabled()>0 ||
!origNode->getCullingActive())
{
--delta_numChildrenWithCullingDisabled;
}
if (newNode->getNumChildrenWithCullingDisabled()>0 ||
!newNode->getCullingActive())
{
++delta_numChildrenWithCullingDisabled;
}
if (delta_numChildrenWithCullingDisabled!=0)
{
setNumChildrenWithCullingDisabled(
getNumChildrenWithCullingDisabled()-1
);
}
return true;
}
else return false;

79
src/osg/Node.cpp
View File

@@ -15,6 +15,10 @@ Node::Node()
_nodeMask = 0xffffffff;
_numChildrenRequiringAppTraversal = 0;
_cullingActive = true;
_numChildrenWithCullingDisabled = 0;
}
@@ -112,6 +116,81 @@ void Node::setNumChildrenRequiringAppTraversal(const int num)
}
void Node::setCullingActive(const bool active)
{
// if no changes just return.
if (_cullingActive == active) return;
// culling active has been changed, will need to update
// both _cullActive and possibly the parents numChildrenWithCullingDisabled
// if culling disabled changes.
// update the parents _numChildrenWithCullingDisabled
// note, if _numChildrenWithCullingDisabled!=0 then the
// parents won't be affected by any app callback change,
// so no need to inform them.
if (_numChildrenWithCullingDisabled==0 && !_parents.empty())
{
int delta = 0;
if (!_cullingActive) --delta;
if (!active) ++delta;
if (delta!=0)
{
// the number of callbacks has changed, need to pass this
// on to parents so they know whether app traversal is
// reqired on this subgraph.
for(ParentList::iterator itr =_parents.begin();
itr != _parents.end();
++itr)
{
(*itr)->setNumChildrenWithCullingDisabled(
(*itr)->getNumChildrenWithCullingDisabled()+delta );
}
}
}
// set the cullingActive itself.
_cullingActive = active;
}
void Node::setNumChildrenWithCullingDisabled(const int num)
{
// if no changes just return.
if (_numChildrenWithCullingDisabled==num) return;
// note, if _cullingActive is false then the
// parents won't be affected by any changes to
// _numChildrenWithCullingDisabled so no need to inform them.
if (_cullingActive && !_parents.empty())
{
// need to pass on changes to parents.
int delta = 0;
if (_numChildrenWithCullingDisabled>0) --delta;
if (num>0) ++delta;
if (delta!=0)
{
// the number of callbacks has changed, need to pass this
// on to parents so they know whether app traversal is
// reqired on this subgraph.
for(ParentList::iterator itr =_parents.begin();
itr != _parents.end();
++itr)
{
(*itr)->setNumChildrenWithCullingDisabled(
(*itr)->getNumChildrenWithCullingDisabled()+delta
);
}
}
}
// finally update this objects value.
_numChildrenWithCullingDisabled=num;
}
const bool Node::computeBound() const
{
_bsphere.init();

20
src/osgPlugins/osg/Node.cpp
View File

@@ -34,6 +34,22 @@ bool Node_readLocalData(Object& obj, Input& fr)
iteratorAdvanced = true;
}
if (fr[0].matchWord("cullingActive"))
{
if (fr[1].matchWord("FALSE"))
{
node.setCullingActive(false);
iteratorAdvanced = true;
fr+=2;
}
else if (fr[1].matchWord("TRUE"))
{
node.setCullingActive(true);
iteratorAdvanced = true;
fr+=2;
}
}
// if (fr.matchSequence("user_data {"))
// {
// notify(DEBUG) << "Matched user_data {"<<endl;
@@ -89,6 +105,10 @@ bool Node_writeLocalData(const Object& obj, Output& fw)
if (!node.getName().empty()) fw.indent() << "name "<<'"'<<node.getName()<<'"'<<endl;
fw.indent() << "cullingActive ";
if (node.getCullingActive()) fw << "TRUE"<<endl;
else fw << "FALSE"<<endl;
// if (_userData)
// {
// Object* object = dynamic_cast<Object*>(_userData);

35
src/osgUtil/CullVisitor.cpp
View File

@@ -367,7 +367,10 @@ CullViewState::CullingMode CullVisitor::getCullingMode() const
void CullVisitor::apply(Node& node)
{
CullViewState::CullingMode mode = _cullingModeStack.back();
if (isCulled(node.getBound(),mode)) return;
if (!node.getCullingActive()) mode = 0;
else if (node.getNumChildrenWithCullingDisabled()==0 &&
isCulled(node.getBound(),mode)) return;
// push the culling mode.
_cullingModeStack.push_back(mode);
@@ -391,7 +394,10 @@ void CullVisitor::apply(Geode& node)
// return if object's bounding sphere is culled.
CullViewState::CullingMode mode = _cullingModeStack.back();
if (isCulled(node.getBound(),mode)) return;
if (!node.getCullingActive()) mode = 0;
else if (node.getNumChildrenWithCullingDisabled()==0 &&
isCulled(node.getBound(),mode)) return;
// push the node's state.
StateSet* node_state = node.getStateSet();
@@ -465,7 +471,10 @@ void CullVisitor::apply(Billboard& node)
{
// return if object's bounding sphere is culled.
CullViewState::CullingMode mode = _cullingModeStack.back();
if (isCulled(node.getBound(),mode)) return;
if (!node.getCullingActive()) mode = 0;
else if (node.getNumChildrenWithCullingDisabled()==0 &&
isCulled(node.getBound(),mode)) return;
// push the node's state.
StateSet* node_state = node.getStateSet();
@@ -566,7 +575,10 @@ void CullVisitor::apply(Group& node)
{
// return if object's bounding sphere is culled.
CullViewState::CullingMode mode = _cullingModeStack.back();
if (isCulled(node.getBound(),mode)) return;
if (!node.getCullingActive()) mode = 0;
else if (node.getNumChildrenWithCullingDisabled()==0 &&
isCulled(node.getBound(),mode)) return;
// push the culling mode.
_cullingModeStack.push_back(mode);
@@ -589,7 +601,10 @@ void CullVisitor::apply(Transform& node)
{
// return if object's bounding sphere is culled.
CullViewState::CullingMode mode = _cullingModeStack.back();
if (isCulled(node.getBound(),mode)) return;
if (!node.getCullingActive()) mode = 0;
else if (node.getNumChildrenWithCullingDisabled()==0 &&
isCulled(node.getBound(),mode)) return;
// push the culling mode.
_cullingModeStack.push_back(mode);
@@ -622,7 +637,10 @@ void CullVisitor::apply(LOD& node)
{
// return if object's bounding sphere is culled.
CullViewState::CullingMode mode = _cullingModeStack.back();
if (isCulled(node.getBound(),mode)) return;
if (!node.getCullingActive()) mode = 0;
else if (node.getNumChildrenWithCullingDisabled()==0 &&
isCulled(node.getBound(),mode)) return;
int eval = node.evaluate(getEyeLocal(),_LODBias);
if (eval<0) return;
@@ -667,7 +685,10 @@ void CullVisitor::apply(Impostor& node)
// return if object's bounding sphere is culled.
CullViewState::CullingMode mode = _cullingModeStack.back();
if (isCulled(bs,mode)) return;
if (!node.getCullingActive()) mode = 0;
else if (node.getNumChildrenWithCullingDisabled()==0 &&
isCulled(node.getBound(),mode)) return;
osg::Vec3 eyeLocal = getEyeLocal();