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

Added CullCallbacks to osg::Node, and osgUtil::CullVisitor.

Browse Source
This commit is contained in:
Robert Osfield
2002-04-15 13:15:48 +00:00
parent 0222f10d27
commit bbef7164db
7 changed files with 69 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
include/osg/Node
View File

@@ -112,6 +112,15 @@ class SG_EXPORT Node : public Object
inline const int getNumChildrenRequiringAppTraversal() const { return _numChildrenRequiringAppTraversal; }
/** Set cull node callback, called during cull traversal. */
void setCullCallback(NodeCallback* nc) { _cullCallback = nc; }
/** Get app node callback, called during app traversal. */
inline NodeCallback* getCullCallback() { return _cullCallback.get(); }
/** Get const app node callback, called during app traversal. */
inline const NodeCallback* getCullCallback() const { return _cullCallback.get(); }
/** 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.*/
@@ -220,6 +229,8 @@ class SG_EXPORT Node : public Object
int _numChildrenRequiringAppTraversal;
void setNumChildrenRequiringAppTraversal(const int num);
ref_ptr<NodeCallback> _cullCallback;
bool _cullingActive;
int _numChildrenWithCullingDisabled;
void setNumChildrenWithCullingDisabled(const int num);

8
include/osg/NodeCallback
View File

@@ -22,7 +22,13 @@ class SG_EXPORT NodeCallback : public Referenced {
/** Callback method call by the NodeVisitor when visiting a node.*/
virtual void operator()(Node*, NodeVisitor*) {}
virtual void operator()(Node* node, NodeVisitor* nv)
{
// note, callback is repsonsible for scenegraph traversal so
// should always include call the traverse(node,nv) to ensure
// that the rest of cullbacks and the scene graph are traversed.
traverse(node,nv);
}
/** Call any nested callbacks and then traverse the scene graph. */
void traverse(Node* node,NodeVisitor* nv);

22
include/osgUtil/AppVisitor
View File

@@ -13,6 +13,7 @@
#include <osg/Switch>
#include <osg/LightSource>
#include <osg/Transform>
#include <osg/Projection>
#include <osg/Impostor>
#include <osgUtil/Export>
@@ -33,17 +34,18 @@ class OSGUTIL_EXPORT AppVisitor : public osg::NodeVisitor
virtual void reset();
virtual void apply(osg::Node& node) { handle_callbacks(node); }
virtual void apply(osg::Node& node) { handle_callbacks_and_traverse(node); }
virtual void apply(osg::Geode& node) { handle_callbacks(node); }
virtual void apply(osg::Billboard& node) { handle_callbacks(node); }
virtual void apply(osg::LightSource& node){ handle_callbacks(node); }
virtual void apply(osg::Geode& node) { handle_callbacks_and_traverse(node); }
virtual void apply(osg::Billboard& node) { handle_callbacks_and_traverse(node); }
virtual void apply(osg::LightSource& node){ handle_callbacks_and_traverse(node); }
virtual void apply(osg::Group& node) { handle_callbacks(node); }
virtual void apply(osg::Transform& node) { handle_callbacks(node); }
virtual void apply(osg::Switch& node) { handle_callbacks(node); }
virtual void apply(osg::LOD& node) { handle_callbacks(node); }
virtual void apply(osg::Impostor& node) { handle_callbacks(node); }
virtual void apply(osg::Group& node) { handle_callbacks_and_traverse(node); }
virtual void apply(osg::Transform& node) { handle_callbacks_and_traverse(node); }
virtual void apply(osg::Projection& node) { handle_callbacks_and_traverse(node); }
virtual void apply(osg::Switch& node) { handle_callbacks_and_traverse(node); }
virtual void apply(osg::LOD& node) { handle_callbacks_and_traverse(node); }
virtual void apply(osg::Impostor& node) { handle_callbacks_and_traverse(node); }
protected:
@@ -54,7 +56,7 @@ class OSGUTIL_EXPORT AppVisitor : public osg::NodeVisitor
/** prevent unwanted copy operator.*/
AppVisitor& operator = (const AppVisitor&) { return *this; }
inline void handle_callbacks(osg::Node& node)
inline void handle_callbacks_and_traverse(osg::Node& node)
{
osg::NodeCallback* callback = node.getAppCallback();
if (callback) (*callback)(&node,this);

14
include/osgUtil/CullVisitor
View File

@@ -183,6 +183,20 @@ class OSGUTIL_EXPORT CullVisitor : public osg::NodeVisitor
/** prevent unwanted copy operator.*/
CullVisitor& operator = (const CullVisitor&) { return *this; }
inline void handle_cull_callbacks_and_traverse(osg::Node& node)
{
osg::NodeCallback* callback = node.getCullCallback();
if (callback) (*callback)(&node,this);
else traverse(node);
}
inline void handle_cull_callbacks_and_accept(osg::Node& node,osg::Node* acceptNode)
{
osg::NodeCallback* callback = node.getCullCallback();
if (callback) (*callback)(&node,this);
else acceptNode->accept(*this);
}
inline osg::Matrix* getCurrentMatrix()
{
return _modelviewStack.back().get();

14
src/Demos/osghud/osghud.cpp
View File

@@ -261,7 +261,19 @@ void set2dScene(osg::Group* rootNode)
}
struct MyCallback : public osg::NodeCallback
{
MyCallback(const std::string& str):_message(str) {}
virtual void operator() (osg::Node* node,osg::NodeVisitor* nv)
{
std::cout<<"In my callback '"<<_message<<"'"<<std::endl;
traverse(node,nv);
}
std::string _message;
};
@@ -328,6 +340,8 @@ int main( int argc, char **argv )
set2dScene(modelview_abs);
projection->addChild(modelview_abs);
projection->setAppCallback(osgNew MyCallback("App callback"));
projection->setCullCallback(osgNew MyCallback("Cull callback"));
group->addChild(projection);

1
src/osg/Node.cpp
View File

@@ -27,6 +27,7 @@ Node::Node(const Node& node,const CopyOp& copyop):
_parents(), // leave empty as parentList is managed by Group.
_appCallback(node._appCallback),
_numChildrenRequiringAppTraversal(0), // assume no children yet.
_cullCallback(node._cullCallback),
_cullingActive(node._cullingActive),
_numChildrenWithCullingDisabled(0), // assume no children yet.
_userData(copyop(node._userData.get())),

20
src/osgUtil/CullVisitor.cpp
View File

@@ -350,7 +350,7 @@ void CullVisitor::apply(Node& node)
StateSet* node_state = node.getStateSet();
if (node_state) pushStateSet(node_state);
traverse(node);
handle_cull_callbacks_and_traverse(node);
// pop the node's state off the geostate stack.
if (node_state) popStateSet();
@@ -551,7 +551,7 @@ void CullVisitor::apply(Group& node)
StateSet* node_state = node.getStateSet();
if (node_state) pushStateSet(node_state);
traverse(node);
handle_cull_callbacks_and_traverse(node);
// pop the node's state off the render graph stack.
if (node_state) popStateSet();
@@ -581,7 +581,7 @@ void CullVisitor::apply(Transform& node)
node.getLocalToWorldMatrix(*matrix,this);
pushModelViewMatrix(matrix.get());
traverse(node);
handle_cull_callbacks_and_traverse(node);
popModelViewMatrix();
@@ -612,7 +612,7 @@ void CullVisitor::apply(Projection& node)
*matrix = node.getMatrix();
pushProjectionMatrix(matrix.get());
traverse(node);
handle_cull_callbacks_and_traverse(node);
popProjectionMatrix();
@@ -649,7 +649,7 @@ void CullVisitor::apply(LOD& node)
if (node_state) pushStateSet(node_state);
//notify(INFO) << "selecting child "<<eval<< std::endl;
node.getChild(eval)->accept(*this);
handle_cull_callbacks_and_accept(node,node.getChild(eval));
// pop the node's state off the render graph stack.
if (node_state) popStateSet();
@@ -667,7 +667,7 @@ void CullVisitor::apply(osg::EarthSky& node)
StateSet* node_state = node.getStateSet();
if (node_state) pushStateSet(node_state);
traverse(node);
handle_cull_callbacks_and_traverse(node);
// pop the node's state off the render graph stack.
if (node_state) popStateSet();
@@ -708,13 +708,13 @@ void CullVisitor::apply(Impostor& node)
{
// outwith the impostor distance threshold therefore simple
// traverse the appropriate child of the LOD.
node.getChild(eval)->accept(*this);
handle_cull_callbacks_and_accept(node,node.getChild(eval));
}
else if (_viewportStack.empty())
{
// need to use impostor but no valid viewport is defined to simply
// default to using the LOD child as above.
node.getChild(eval)->accept(*this);
handle_cull_callbacks_and_accept(node,node.getChild(eval));
}
else
{
@@ -799,7 +799,7 @@ void CullVisitor::apply(Impostor& node)
{
// no impostor has been selected or created so default to
// traversing the usual LOD selected child.
node.getChild(eval)->accept(*this);
handle_cull_callbacks_and_accept(node,node.getChild(eval));
}
}
@@ -973,7 +973,7 @@ ImpostorSprite* CullVisitor::createImpostorSprite(Impostor& node)
{
// traversing the usual LOD selected child.
node.getChild(eval)->accept(*this);
handle_cull_callbacks_and_accept(node,node.getChild(eval));
}