Inventor/actions/SoCallbackAction.h

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/*=======================================================================
 * Copyright 1991-1996, Silicon Graphics, Inc.
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/*=======================================================================
** Author      : Dave Immel (MMM yyyy)
** Modified by : Thad Beier (MMM yyyy)
**=======================================================================*/
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/


#ifndef  _SO_CALLBACK_ACTION_
#define  _SO_CALLBACK_ACTION_

#include <Inventor/SbBox.h>
#include <Inventor/actions/SoSubAction.h>
#include <Inventor/nodes/SoComplexity.h>
#include <Inventor/nodes/SoDrawStyle.h>
#include <Inventor/nodes/SoFont.h>
#include <Inventor/nodes/SoLightModel.h>
#include <Inventor/nodes/SoMaterialBinding.h>
#include <Inventor/nodes/SoNormalBinding.h>
#include <Inventor/nodes/SoPickStyle.h>
#include <Inventor/nodes/SoShapeHints.h>
#include <Inventor/nodes/SoTexture.h>
#include <Inventor/nodes/SoTextureCoordinateBinding.h>
#include <Inventor/nodes/SoUnits.h>
#include <Inventor/elements/SoDecimationTypeElement.h>
#include <Inventor/actions/SoGLRenderAction.h>

class SoPrimitiveVertex;
class SoShape;
class SoTexture2Transform;

//
// Typedefs for callback routines used with the callbacks for
// generating primitives.
//
typedef void SoTriangleCB(void *userData,
                          SoCallbackAction *action,
                          const SoPrimitiveVertex *v1,
                          const SoPrimitiveVertex *v2,
                          const SoPrimitiveVertex *v3);
typedef void SoLineSegmentCB(void *userData, 
                             SoCallbackAction *action,
                             const SoPrimitiveVertex *v1,
                             const SoPrimitiveVertex *v2);
typedef void SoPointCB(void *userData, 
                       SoCallbackAction *action,
                       const SoPrimitiveVertex *v);

#ifdef _WIN32
//JSG - Changed SoCallbackActionCB back to how it is done under unix,
//SoCallbackActionCB2 is included for backward compatability on Windows
typedef int SoCallbackActionCB2(void *userData,
                                SoCallbackAction *action,
                                const SoNode *node);
#endif
//
//  Class: SoCallbackAction
//
//  State accumulation action. This action performs a generic
//  traversal of a scene graph. The caller can register callback
//  functions to be called when specific types of nodes are traversed.
//

class  SoCallbackAction : public SoAction {

  SO_ACTION_HEADER(SoCallbackAction);

 public:

  enum Response {
    CONTINUE,
    ABORT,
    PRUNE
  };

  typedef Response SoCallbackActionCB(void *userData,
                                      SoCallbackAction *action,
                                      const SoNode *node);

  SoCallbackAction();

  // Destructor
#ifndef HIDDEN_FROM_DOC
  virtual ~SoCallbackAction();
#endif // HIDDEN_FROM_DOC

  //
  // Adding callback functions:
  //

  void addPreCallback(SoType type, SoCallbackActionCB *cb, void *data);

  void addPostCallback(SoType type, SoCallbackActionCB *cb, void *data);

  void addPreTailCallback(SoCallbackActionCB *cb, void *data);

  void addPostTailCallback(SoCallbackActionCB *cb, void *data);

  void addTriangleCallback(SoType type, SoTriangleCB *cb, void *data);

  void addLineSegmentCallback(SoType type, SoLineSegmentCB *cb, void *data);

  void addPointCallback(SoType type, SoPointCB *cb, void *data);

  //
  // Accessing state information from callbacks. Non-obvious return
  // values are documented.
  //


  float getComplexity() const;

  SoComplexity::Type getComplexityType() const;


  int32_t getNumCoordinates() const;

  const SbVec3f &getCoordinate3(int index) const;

  const SbVec4f &getCoordinate4(int index) const;

  SoDecimationTypeElement::Type getDecimationType() const;

  float getDecimationPercentage() const;

  SoDrawStyle::Style getDrawStyle() const;

  u_short getLinePattern() const;

  int getLinePatternScaleFactor() const;

  float getLineWidth() const;

  float getPointSize() const;


  const SbString & getFontName() const;

  float getFontSize() const;

  SoFont::RenderStyle getFontRenderStyle() const;


  SoLightModel::Model getLightModel() const;

  const SbVec3f &getLightAttenuation() const;


  void getMaterial(SbColor &ambient,
                   SbColor &diffuse,
                   SbColor &specular,
                   SbColor &emission,
                   float &shininess,
                   float &transparency,
                   int mtlIndex = 0) const;

  SoMaterialBinding::Binding getMaterialBinding() const;


  SoGLRenderAction::TransparencyType getTransparencyType() const;


  int32_t getNumNormals() const;

  const SbVec3f & getNormal(int index) const;

  SoNormalBinding::Binding getNormalBinding() const;


  int32_t getNumProfileCoordinates() const;

  const SbVec2f &getProfileCoordinate2(int index) const;

  const SbVec3f &getProfileCoordinate3(int index) const;

  const SoNodeList & getProfile() const;


  SoShapeHints::VertexOrdering getVertexOrdering() const;

  SoShapeHints::ShapeType getShapeType() const;

  SoShapeHints::FaceType getFaceType() const;

  float getCreaseAngle() const;


  int32_t getNumTextureCoordinates() const;

  const SbVec2f &getTextureCoordinate2(int index) const;

  const SbVec4f &getTextureCoordinate4(int index) const;

  SoTextureCoordinateBinding::Binding   getTextureCoordinateBinding() const;

#ifdef _WIN32

  const SbColor getTextureBlendColor() const;
#else
  const SbColor &getTextureBlendColor() const;
#endif

  const unsigned char *getTextureImage(SbVec2i32 &size, int &numComps) const;

  const SbName &getTextureFileName() const;

  const SbMatrix &getTextureMatrix() const;

  const SoTexture2Transform *getTextureTransformNode() const;

  SoTexture::Model getTextureModel() const;

  SoTexture::Wrap getTextureWrapS() const;
  SoTexture::Wrap getTextureWrapT() const;


  const SbMatrix & getModelMatrix() const;

  SoUnits::Units getUnits() const;


  float getFocalDistance() const;

  const SbMatrix &getProjectionMatrix() const;

  const SbMatrix &getViewingMatrix() const;

  const SbViewVolume &getViewVolume() const;


  SoPickStyle::Style getPickStyle() const;

  int32_t getSwitch() const;

  void setCallbackAll(SbBool flag) { callbackAll = flag; }

  SbBool isCallbackAll() const  { return callbackAll; }

  virtual void forwardTraversal( SoNode* node );

  virtual void forwardTraversal( SoPath* path );

#if 1             SoDEPRECATED
  const unsigned char *getTextureImage(SbVec2s &size, int &numComps) const;

#endif 
private:
#ifdef _WIN32
  void addPreCallback(SoType type, SoCallbackActionCB2 *cb, void *data);
  void addPostCallback(SoType type, SoCallbackActionCB2 *cb, void *data);
  void addPreTailCallback(SoCallbackActionCB2 *cb, void *data);
  void addPostTailCallback(SoCallbackActionCB2 *cb, void *data);
#endif

  // Returns the current response
  Response getCurrentResponse() const { return response; }

  // Call the pre-callbacks and post-callbacks
  virtual void invokePreCallbacks(const SoNode *node);
  virtual void invokePostCallbacks(const SoNode *node);

  // Call the primitive callbacks
  virtual void invokeTriangleCallbacks(const SoShape *shape,
                               const SoPrimitiveVertex *v1,
                               const SoPrimitiveVertex *v2,
                               const SoPrimitiveVertex *v3);
  virtual void invokeLineSegmentCallbacks(const SoShape *shape,
                                  const SoPrimitiveVertex *v1,
                                  const SoPrimitiveVertex *v2);
  virtual void invokePointCallbacks(const SoShape *shape,
                            const SoPrimitiveVertex *v);

  // Should primitives be generated for this shape?
  virtual SbBool shouldGeneratePrimitives(const SoShape *shape) const;    

 private:

  // This flag is used by the SoSwitch etc. nodes which must return a
  // different result from its 'affectsState' method when called
  // during a CallbackAction that is doing the callback on all children.
  static SbBool duringCallbackAll;
  static void initClass();
  static void exitClass();
  
  // Returns the node that caused the callback:
  virtual SoNode *getCurPathTail();
  
  // Set the current node during traversal:
  void setCurrentNode(SoNode *node)
    { currentNode = node;} 

  void setStartTransparencyType(  SoGLRenderAction::TransparencyType type) {
    transpType = type;
  };

  bool removeTriangleCallback(SoType type, SoTriangleCB *cb);

  bool removeLineSegmentCallback(SoType type, SoLineSegmentCB *cb);

  bool removePointCallback(SoType type, SoPointCB *cb);

  bool removePostCallback(SoType type, SoCallbackActionCB *cb);

  bool removePreCallback(SoType type, SoCallbackActionCB *cb);

  enum CBFuncTypes
  {
    NONE=0,
    PRE =1,
    POST=2,
    PRE_TAIL=4,
    POST_TAIL=8,
    ANY=PRE|POST|PRE_TAIL|POST_TAIL,
  };

  // get the container for the given type
  // for same type ambiguity is solved using type
  template< class T, int N >
  SbPList& getCallbackList( );

 private:
  // Initiates action on graph
  virtual void beginTraversal(SoNode *node);

  // transforms vertices with the given matrix.
  // this is used to transform points during a forward traversal for callback actions
  void transformForwardTraversedVertices(const SbMatrix& model, size_t numVertices, SoPrimitiveVertex** vertices);

  // Response from last callback
  Response response;

 private:
  SbBool callbackAll;   // Callback all children or follow
  // normal traversal rules.
  // Callback lists
  SbPList preCallbackList;
  SbPList postCallbackList;

  SbPList preTailCallbackList;
  SbPList postTailCallbackList;

  SbPList triangleCallbackList;
  SbPList lineSegmentCallbackList;
  SbPList pointCallbackList;

  // Node where the callback occurs:
  SoNode *currentNode;

  SoGLRenderAction::TransparencyType transpType;     // Transparency quality type

  // Boolean to specify if we stop call of pre and post callback
  // When we do a forwardTraversal, we should not call pre/post callback
  bool m_stopPrePostCallback;
};

#endif /* _SO_CALLBACK_ACTION_ */

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Open Inventor Toolkit reference manual, generated on 4 Sep 2023
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