SoIndexedFaceSet.h

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**=======================================================================*/
/*=======================================================================
** Author      : Paul S. Strauss (MMM yyyy)
** Modified by : Gavin Bell (MMM yyyy)
**=======================================================================*/
/*=======================================================================
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**=======================================================================*/
/*=======================================================================
** Modified by : AJO (May 2011)
**=======================================================================*/
 
 
#ifndef  _SO_INDEXED_FACE_SET_
#define  _SO_INDEXED_FACE_SET_
 
#include <Inventor/nodes/SoIndexedShape.h>
#include <Inventor/sys/SoGLType.h>
 
//
//  Class: SoIndexedFaceSet
//
//  Indexed set of faces. Each face consists of 3 or more vertices,
//  each of which is denoted by an integer index (from the coordIndex
//  field) into the current coordinates. Depending on the current
//  material and normal binding values, the materials and normals for
//  the faces or vertices may be accessed in order or indexed. If they
//  are indexed, the materialIndex and normalIndex fields are used.
//
 
 
// This coordinate index indicates that the current face ends and the
// next face begins.  Use this for simple (1 contour) polygons.
#define SO_END_FACE_INDEX       (-1)
 
// If SoShapeHints is used with a windingType other than NO_WINDING_TYPE,
// this coordinate index indicates that the current contour ends
// and the next contour begins.
#define SO_END_CONTOUR_INDEX    (-1)
 
// This coordinate index indicates that the current complex face (block
// of contours) ends.
#define SO_END_POLYGON_INDEX    (-2)
 
class SoNormalBundle;
class SoShapeStyleElement;
class SoVolumeIndexedFaceSet;
 
SO_PIMPL_PUBLIC_DECLARATION(SoIndexedFaceSet)
 
 
class  SoIndexedFaceSet : public SoIndexedShape
{
  SO_NODE_HEADER(SoIndexedFaceSet);
  SO_PIMPL_PUBLIC_HEADER(SoIndexedFaceSet)
 
public:
 
  SoIndexedFaceSet();
 
private:
  // Implements actions
  virtual void GLRender( SoGLRenderAction* action );
 
 // Generates default normals using the given normal bundle. 
  // Returns TRUE.
  virtual void generateDefaultNormals( SoState* state,
                                       const SbVec3f* coords,
                                       int numCoords,
                                       SoNormalBundle* nb,
                                       SbBool storeRef = FALSE);
 
  virtual void shouldGenerateTangents( SoGLRenderAction* /*action*/, const SoShapeStyleElement* /*shapeStyle*/ ) {}
 
  virtual void getPrimitiveCount( SoGetPrimitiveCountAction* action );
  virtual void rayPick(SoRayPickAction *action);
                                                  
private:
 
  static void initClass();
  static void exitClass();
  
  // set numTris/Quads/Faces to -1 when notified
  virtual void notify( SoNotList* list );
 
  // Compute the number of vertices. This is just an approximation,
  //so using 5 verts per unknown polygon is close enough. 
  virtual int getNumPrim( SoState* state = NULL );
 
 private:
  // This enum is used to indicate the current material or normal binding
  enum Binding {
    OVERALL,
    PER_FACE,
    PER_FACE_INDEXED,
    PER_VERTEX,
    PER_VERTEX_INDEXED
  };
 
  //Whether to check or not shapeHints
  virtual SbBool shouldCheckShapeHints(){ return TRUE;}
 
  virtual SbBool shouldGenerateTexture3DCoordinates(){return TRUE;}
 
  virtual void callSetupIndices( SoState* state, const SoShapeStyleElement* shapeStyle, uint32_t useTexCoordsAnyway );
 
  //Whether to check or not 3d tex coords
  virtual SbBool checkTex3Coords(){return TRUE;}
 
  virtual SbBool shapeHintsTest( SoState* state = NULL );
 
  int getNumPrim( int& _numTris, int& _numQuads, int& _numFaces );
 
  virtual void countPrim( SoState* state = NULL );
 
  // Generates triangles representing faces
  virtual void generatePrimitives( SoAction* action );
 
  // render function
  virtual void doRendering( SoGLRenderAction* action, const SoShapeStyleElement* shapeStyle );
 
  // Overrides standard method to create an SoFaceDetail instance
  virtual SoDetail* createTriangleDetail( SoRayPickAction* action,
                                          const SoPrimitiveVertex* v1,
                                          const SoPrimitiveVertex* v2,
                                          const SoPrimitiveVertex* v3,
                                          SoPickedPoint* pp );
 
  //When tesselating complex polygons, keep the result cached
  virtual bool hasGeneratePrimitiveCache()
  {
    return true;
  }
 
  // destructor
  virtual ~SoIndexedFaceSet();
};
 
#endif /* _SO_INDEXED_FACE_SET_ */