SoTextureCoordinateBundle.h

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/*=======================================================================
** Author      : Paul S. Strauss (MMM yyyy)
**=======================================================================*/
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/
 
 
#ifndef  _SO_TEXTURE_COORDINATE_BUNDLE
#define  _SO_TEXTURE_COORDINATE_BUNDLE
 
#include <Inventor/bundles/SoBundle.h>
#include <Inventor/elements/SoTextureCoordinateElement.h>
#include <Inventor/misc/SoState.h>
#include <memory>
 
class TexGenEvaluatorBundle;

//
//  Class: SoTextureCoordinateBundle
//
//  Bundle that allows shapes to deal with texture coordinates more
//  easily. This class provides a fairly simple interface to texture
//  coordinate handling, including default texture coordinate
//  generation. This can be used during either rendering or primitive
//  generation.
//
//  This class can be used during either rendering or primitive
//  generation. For primitive generation, there are two cases,
//  distinguished by the flag returned by isFunction(). If this
//  flag is TRUE, the texture coordinates are to be generated using
//  the get(point, normal) method, which uses a software texture
//  coordinate function. (This process is also used for texture
//  coordinates that are generated by default when necessary - in this
//  case, the function does a linear map across two sides of the
//  bounding box of the shape.) If the isFunction() flag is FALSE, the
//  coordinates are accessed directly from the element using the
//  get(index) method.
//
//  For GL rendering, there is an additional case. If
//  needCoordinates() returns FALSE, no texture coordinates need to be
//  sent at all, and the bundle does not have to be used for anything
//  else. Otherwise, send(index) should be used.
//
 
{
 
 public:
  // Constructor - takes the action the bundle is used for and a
  // flag to indicate whether the bundle is being used for
  // rendering. If this is TRUE, the bundle can be used to send
  // texture coordinates to GL. If it is FALSE, the setUpDefault
  // flag (default TRUE) indicates whether to set up a texture
  // coordinate function if the binding is DEFAULT. Shapes can pass
  // FALSE here if they are picking and want to delay computation of
  // the texture coordinates until an intersection is found.
  // texUnits is the eventual list of texture units where texture
  // coordinates should be generated. If not set the current texture unit is used.
  SoTextureCoordinateBundle(SoAction *action, SbBool forRendering,
                            SbBool setUpDefault = TRUE, const SbIntList *texUnits=NULL);
 
  // This constructor is used for meshes such as VEMLElevationGrid or
  // QuadMesh. The constructor calls different methods to insure
  // that the texture doesn't get mapped edgeon. The last argument is
  // just to make the methods unique.
  // texUnits is the eventual list of texture units where texture
  // coordinates should be generated. If not set the current texture unit is used.
  SoTextureCoordinateBundle(SoAction *action, SbBool forRendering,
                            SbBool setUpDefault, SbBool forMesh,
                            const SbIntList *texUnits=NULL);
  // Destructor
  ~SoTextureCoordinateBundle();
 
  // Returns TRUE if texture coordinates are needed at all
  SbBool              needCoordinates() const { return needCoords; }
 
  // return value to determine which get() to use.
  SbBool              isFunction() const      { return isFunc; }
 
  // Returns texture coordinate computed by function during
  // primitive generation or rendering
  SbVec4f             get(const SbVec3f &point, const SbVec3f &normal) const
  { return texCoordElt->get(point, normal, m_curUnit); }
 
  // Returns indexed texture coordinate during primitive generation
  // or rendering
  SbVec4f             get(int index) const
  { if (tCoords) 
      return(SbVec4f(tCoords[index][0],tCoords[index][1],
                     0.0, 1.0)); 
    else 
      return texCoordElt->get4(index, m_curUnit); 
  }
 
  // Sends indexed texture coordinate to GL during rendering
  void                send(int index) const;
 
 private:
  // TextureCoordinate elements:
  const SoTextureCoordinateElement    *texCoordElt;
  const SoTextureCoordinateElement  *GLTexCoordElt;
 
  SbBool              needCoords;     // Texture coordinates are needed
  SbBool              isFunc;         // Coordinates generated by function
  SbBool              isRendering;    // Bundle being used for rendering
  SbBool              m_statePushed ;  // Indicate if the state has been pushed
 
  // These indicate the dimensions used for S and T for default
  // texture coordinate generation
  int                 coordS, coordT;
  // These hold the vectors used for default texture coordinate generation
  SbVec4f             sVector, tVector;
  // This holds the texture coords from a vertexProperty node:
  const SbVec2f *     tCoords;
 
  // The eventual list of texture units where texture
  // coordinates should be generated. If not set the current texture unit is used.
  const SbIntList *m_texUnits ;
 
  // First texture image unit
  int              m_unitImage ;
 
  // Current texture unit
  int              m_curUnit ;
 
  // Sets up bundle for primitive generation or rendering
  void                setUpForPrimGen(SoAction *action, SbBool setUpDefault);
  void                setUpForGLRender(SoAction *action);
 
  // Sets up for default texture coordinate generation
  void                setUpDefaultCoordSpace(SoAction *action);
 
  // Sets up bundle for primitive generation or rendering for meshes
  void                setUpForPrimGenMesh(SoAction *action, SbBool setUpDefault, SbBool forMesh);
  void                setUpForGLRenderMesh(SoAction *action, SbBool forMesh);
 
  // Sets up for default texture coordinate generation for meshes
  void                setUpDefaultCoordSpaceMesh(SoAction *action, SbBool forMesh);
 
  // Update texture units used
  void updateTexUnits(const SbIntList *texUnits) ;

  void setupTextureCoordinateElement(SoState* state, SoNode* currentNode) const;
  
  std::unique_ptr<TexGenEvaluatorBundle> m_texGenEvaluator;
};
 
#endif /* _SO_TEXTURE_COORDINATE_BUNDLE */