SoTextureCoordinateElement.h

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**=======================================================================*/
/*=======================================================================
** Author      : Gavin Bell (MMM yyyy)
**=======================================================================*/
/*=======================================================================
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/
 
 
#ifndef  _SO_TEXTURE_COORDINATE_ELEMENT
#define  _SO_TEXTURE_COORDINATE_ELEMENT
 
#include <Inventor/SbLinear.h>
#include <Inventor/elements/SoReplacedTextureElement.h>
#include <Inventor/SbEnums.h>
#include <memory>
 
#include <Inventor/STL/vector>
 
typedef const SbVec4f &
SoTextureCoordinateFunctionCB(void *userdata, const SbVec3f &point,
                              const SbVec3f &normal);
 
 
SoEXTENDER_Documented class  SoTextureCoordinateElement : public SoReplacedTextureElement {
  
  SO_ELEMENT_HEADER(SoTextureCoordinateElement);
  
 public:
  enum CoordType {
    EXPLICIT = 1,     // Coordinates stored in state
    FUNCTION = 2      // Coordinates generated by software function
  };
 
  static void         setDefault(SoState *state, SoNode *node);
 
  // FUNCTION:
  static void         setFunction(SoState *state, SoNode *node,
                                  SoTextureCoordinateFunctionCB *func,
                                  void *userData, 
                                  SbBool frcSend = FALSE);
  // EXPLICIT:
  static void         set2(SoState *state, SoNode *node,
                           int32_t numCoords, const SbVec2f *coords,
                           SbBool frcSend = FALSE);
 
  static void         set4(SoState *state, SoNode *node,
                           int32_t numCoords, const SbVec4f *coords,
                           SbBool frcSend = FALSE);
    
  static CoordType    getType(SoState *state, int unit=0);
 
  virtual CoordType   getType(int unit=0) const;
    
  static const SoTextureCoordinateElement * getInstance(SoState *state);
    
  // Get routine for FUNCTION case:
    
  const SbVec4f &     get(const SbVec3f &point, const SbVec3f &normal, 
                          int unit=0) const;
    
  // Get routines for EXPLICIT case:
    
  int32_t             getNum(int unit=0) const ;
    
  SbBool              is2D(int unit=0) const ;
 
  SbBool              isForceSending(int unit=0) const ;
    
  const SbVec2f &     get2(int index, int unit=0) const;
  const SbVec4f &     get4(int index, int unit=0) const;
    
  virtual void        print(FILE *fp) const;
 
  virtual void push(SoState *) ;
 
private:
 
  virtual void commonInit();
 
  virtual void init(SoState *state);
 
 private:
  class TexGenEvaluator
  {
  public:
    virtual const SbVec4f& eval(const SbVec3f &point, const SbVec3f &normal) = 0;
  };
 
  static void setTextureCoordType(SoState *state, SoNode *node, CoordType coordType);
  
  // Initializes the SoTextureCoordinateElement class
  static void         initClass();
  static void         exitClass();
 
  private:
 
   virtual ~SoTextureCoordinateElement();
   
   struct SoTexCoordData 
   {
     // What kind of coordinates will be done:
     CoordType         whatKind;
 
     // Storage for FUNCTION:
     std::shared_ptr<TexGenEvaluator> m_texGenEvaluatorUserDefined;
     
     // Storage for EXPLICIT:
     int32_t           numCoords;
     const SbVec2f     *coords2;
     const SbVec4f     *coords4;
     SbBool            coordsAre2D;
     SbBool            forceSend;
 
     SoTexCoordData() :
      whatKind(EXPLICIT),
      numCoords(0),
      coords2(NULL),
      coords4(NULL),
      coordsAre2D(FALSE),
      forceSend(FALSE)
     {
     }
 
    void initValues( const CoordType &type )
    {
      whatKind = type;
      numCoords = 0;
      coords2 = NULL; 
      coords4 = NULL;
      coordsAre2D = FALSE;
      forceSend = FALSE;
      m_texGenEvaluatorUserDefined.reset();
    }
 
     SoTexCoordData& operator=(const SoTexCoordData& data)
     {
       if ( &data != this )
       {
         whatKind = data.whatKind ;
         numCoords = data.numCoords ;
         coords2 = data.coords2 ;
         coords4 = data.coords4 ;
         coordsAre2D = data.coordsAre2D ;
         forceSend = data.forceSend;
       }
       return *this ;
     }
   } ;
 
   SoTexCoordData& getTexCoordData( const int unit ) const;
 
 private:
  SbVec2f             m_convert2;       // To convert from 4-D to 2-D
  SbVec4f             m_convert4;       // To convert from 2-D to 4-D
 
  //Neeed for get method which don't have state we need
  SoState* m_state;
  
  typedef std::vector<SoTexCoordData> SoTexCoordDataList;
 
  mutable SoTexCoordDataList m_texCoordData ;
};
 
 
#endif /* _SO_TEXTURE_COORDINATE_ELEMENT */