Inventor/nodes/SoNode.h

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/*=======================================================================
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/*=======================================================================
** Author      : Paul S. Strauss (MMM yyyy)
** Modified by : Nick Thompson (MMM yyyy)
**=======================================================================*/
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/


#ifndef  _SO_NODE_
#define  _SO_NODE_

#include <Inventor/fields/SoFieldContainer.h>
#include <Inventor/nodes/SoSubNode.h>
#include <Inventor/SoLists.h>
#include <Inventor/SbString.h>
#include <Inventor/SoType.h>
#include <Inventor/sensors/SoDataSensor.h>
#include <Inventor/STL/vector>

class SoNodeList;
class SoAction;
class SoCallbackAction;
class SoChildList;
class SoFieldData;
class SoGLRenderAction;
class SoGetBoundingBoxAction;
class SoGetMatrixAction;
class SoHandleEventAction;
class SoInput;
class SoOutput;
class SoPickAction;
class SoRayPickAction;
class SoSearchAction;
class SoWriteAction;
class SbProjectionCoordinates;
class SoGetPrimitiveCountAction;
class SoComputeRenderUnitIDAction;
class SoNodeImpl;
class SoDistributeAction;
class SoState;

//
//  Class: SoNode
//
//  Base SoNode class (abstract).
//


class  SoNode : public SoFieldContainer {

  SO_NODE_ABSTRACT_HEADER(SoNode);

 public:

  inline virtual void setOverride(const SbBool state);

  inline virtual SbBool isOverride() const;

  virtual SoNode *    copy(SbBool copyConnections = FALSE) const;

  virtual SbBool      affectsState() const;

  static SoNode *     getByName(const SbName &name);

  static int          getByName(const SbName &name, SoNodeList &list);

  virtual void        touch();

private:

  inline virtual SoNode* getAlternateRep(SoAction* action);

  inline virtual SbBool isBoundingBoxIgnoring() const;

  // This method performs the "typical" operation of a node for any
  // action. The default implementation does nothing.
  virtual void        doAction(SoAction *action);

  // These virtual functions implement all of the actions for nodes,
  // Most of the default implementations do nothing.
  virtual void        GLRender(SoGLRenderAction *action);
  virtual void        callback(SoCallbackAction *action);
  virtual void        getBoundingBox(SoGetBoundingBoxAction *action);
  virtual void        getMatrix(SoGetMatrixAction *action);
  virtual void        handleEvent(SoHandleEventAction *action);
  virtual void        pick(SoPickAction *action);
  virtual void        rayPick(SoRayPickAction *action);
  virtual void        search(SoSearchAction *action);
  virtual void        write(SoWriteAction *action);
  virtual void        getPrimitiveCount(SoGetPrimitiveCountAction *action);
  virtual void        distribute(SoDistributeAction *action);

  // These methods make render traversal faster by implementing
  // different rendering paths corresponding to different action
  // path codes.  The SoNode methods just call GLRender.
  virtual void        GLRenderBelowPath(SoGLRenderAction *action);
  virtual void        GLRenderInPath(SoGLRenderAction *action);
  virtual void        GLRenderOffPath(SoGLRenderAction *action);

  // These virtual functions are called when a node gains or loses
  // status as "grabber" of events (see HandleEventAction::setGrabber()).
  // The default methods do nothing.
  virtual void        grabEventsSetup();
  virtual void        grabEventsCleanup();

  // 
  // This virtual function is called when ScaleViz want to now 
  // if the parent separator must be traversed or not in compositing mode.
  //
  // By default such decision is taken by the Separator iteself through the 
  // renderUnitID field and then returned value is SO_RENDERUNITID_INHERIT.
  //
  // For some class of nodes we want to force a specific values.
  //
  // example :
  //   - SoTransparency node in Depth Compositing on OIRU side return SO_RENDERUNITID_ALL
  //   to force all transparent node below the separator to be rendered on all OIRU.
  //
  virtual int32_t     getRenderUnitID() const;

 private:

  // Creates and returns an exact copy of the node and returns the
  // dictionary of original and new nodes. This method is used when
  // creating the PROTOInstances on the fly.
  SoNode *            copyForPROTO(SbBool copyConnections = FALSE) const;
  enum Stage {
    FIRST_INSTANCE,         // First real instance being constructed
    PROTO_INSTANCE,         // Prototype instance being constructed
    OTHER_INSTANCE          // Subsequent instance being constructed
  };

  // Initializes base node class
  static void         initClass();
  static void         exitClass();

  // Initialize ALL Inventor node classes
  static void         initClasses();
  static void         exitClasses();

  // Initiates notification from an instance.
  virtual void        startNotify();

  // Propagates modification notification through an instance.
  virtual void        notify(SoNotList *list);

  // Returns the unique id for a node
  uint64_t getNodeId() const { return m_uniqueId; }

  // Returns the next available unique id
  static uint64_t getNextNodeId();

  // Returns pointer to children, or NULL if none
  virtual SoChildList *getChildren() const;
  virtual bool isSynchronizingContentOnly() { return FALSE; }
  virtual SoChildList *internalGetChildren() const;

  virtual void internalRemoveChild(int);
  virtual void internalRemoveChild(SoNode *);
  virtual void internalRemoveAllChildren();
  virtual void internalAddChild(SoNode *);
  virtual int  internalFindChild(const SoNode *) const;
  virtual void internalInsertChild(SoNode *, int);
  virtual SoNode *internalGetChild( int ) const;
  virtual void internalReplaceChild(int, SoNode *);
  virtual void internalReplaceChild(SoNode *, SoNode *);
  virtual int internalGetNumChildren();

  // Get details of change (only valid during notification)
  SoNode* getChangedChild() const;
  int getChangedIndex() const;
  SoDataSensor::ChangeType getChangeType() const;

  // Writes instance to SoOutput. (Used for either stage of writing.)
  virtual void        writeInstance(SoOutput *out);

  // Returns the index of this node in the action/method table,
  // given its type.
  static int          getActionMethodIndex(SoType t);

  // Recursively adds this node and all nodes under it to the copy
  // dictionary. Returns the copy of this node.
  virtual SoNode *    addToCopyDict() const;

  // Copies the contents of the given node into this instance. The
  // default implementation copies just field values and the name.
  virtual void        copyContents(const SoFieldContainer *fromFC,
                                   SbBool copyConnections);

  // Copies an instance that is encountered through a field connection
  virtual SoFieldContainer *  copyThroughConnection() const;

  // Set the nodeImpl private structure info
  void setNodeImpl(SoNodeImpl *nodeImpl);

  // return SoNodeImpl private structure info
  template <typename T>
  inline T* getNodeImpl() const
  {
#if defined(_DEBUG)
    T* implNode = dynamic_cast<T*>(m_soNodeImpl);
    assert(implNode);
#endif
    return static_cast<T*>(m_soNodeImpl);
  }

  // Get the curent node alternate representation
  // Cache the alternate rep if requested.
  SoNode* getCachedAlternateRep(SoAction* action, SbBool doCache = FALSE);

  virtual bool affectsPath() const;

  void setChildrenSameFieldsValueNotificationEnabled(SbBool value);

  // added to manage global node operations for shapes
  virtual void        GLRenderP(SoGLRenderAction *action);

 private:

  static void setNextActionMethodIndex(int index);
  static int  getNextActionMethodIndex();
  static void incNextActionMethodIndex();

  // Constructor, destructor
  SoNode();
  virtual ~SoNode();

 private:
  // Unique id for this node.
  uint64_t m_uniqueId;

  // Next index into the action method table
  static int         nextActionMethodIndex;

  // These static methods are registered with the database - they
  // simply call the appropriate virtual function
  static void callbackS(SoAction *, SoNode *);
  static void GLRenderS(SoAction *, SoNode *);
  static void getBoundingBoxS(SoAction *, SoNode *);
  static void getMatrixS(SoAction *, SoNode *);
  static void handleEventS(SoAction *, SoNode *);
  static void pickS(SoAction *, SoNode *);
  static void rayPickS(SoAction *, SoNode *);
  static void searchS(SoAction *, SoNode *);
  static void writeS(SoAction *, SoNode *);
  static void getPrimitiveCountS(SoAction *, SoNode *);

  static void distributeS(SoAction *, SoNode *);

  // method to provide forward traversal
  template < class SPEC_ACTION >
  static void forwardTraversalS(SoAction *action, SoNode *node);
  // helper to get node to traverse internally
  SoNode* getNodeToTraverse(SoAction* action, bool force = false);

  SoNode* m_cachedAlternateRep;

 private:

  //---------------------------------------------

  //directViz integration

  //directViz objects list ( std::vector<> )
  void* m_directVizObjects;

  //apend directViz object to the node's list
  void addDirectVizObject( void *directVizObject );

  //return directViz object at position pos as a void*
  void* getDirectVizObject( unsigned int pos );

  //return number of DirectViz objects
  int getNumDirectVizObjects();

  //clear directViz objects list
  void clearDirectVizObjects();

  //---------------------------------------------

  SbProjectionCoordinates *getProjectionCoordinates(){return m_projCoords;}

  void setProjectionCoordinates(SbProjectionCoordinates *projCoords){
    m_projCoords = projCoords;
  }

  //Projections
 private:
  SbProjectionCoordinates *m_projCoords;

 private:
  // used by ScaleViz for ComputeRenderUnitID action
  SoNodeImpl* m_soNodeImpl;

  // hold envvar OIV_CATCH_GLERROR for debugging purpose
  static bool s_catchGLError;
  friend class SoLightPath;
};

SoNode* 
SoNode::getAlternateRep(SoAction*)
{
  return this;
}

SbBool 
SoNode::isBoundingBoxIgnoring() const
{
  return FALSE;
}

void 
SoNode::setOverride(const SbBool)
{
#if defined(_DEBUG)
  SoDebugError::postWarning("SoNode::setOverride","not reimplemented and supported for this inherited node");
#endif
}

SbBool
SoNode::isOverride() const
{
  return FALSE;
}

#endif /* _SO_NODE_ */

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Open Inventor Toolkit reference manual, generated on 12 Feb 2024
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