Inventor/nodes/SoNurbsSurface.h

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/*=======================================================================
** Author      : Dave Immel (MMM yyyy)
**=======================================================================*/
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/


#ifndef  _SO_NURBS_SURFACE_
#define  _SO_NURBS_SURFACE_

#include <Inventor/fields/SoMFFloat.h>
#include <Inventor/fields/SoSFFloat.h>
#include <Inventor/fields/SoSFInt32.h>
#include <Inventor/nodes/SoShape.h>
#include <Inventor/nodes/SoNurbsGroup.h>
#include <Inventor/threads/SbThreadLocalStorage.h>
#include <Inventor/caches/SoVBOMgr.h>

class SoState;
class SoNurbsSurfaceCache;
class SoNurbsBREPAction;
class SoBrep;
class Pquad_tess_param;
class GLUnurbs;
class SbThreadRWMutex;

class  SoNurbsSurface : public SoShape {

  SO_NODE_HEADER(SoNurbsSurface);
  
 public:
  SoSFInt32 numUControlPoints;

  SoSFInt32 numVControlPoints;

  SoSFInt32 numSControlPoints;

  SoSFInt32 numTControlPoints;

  SoMFFloat uKnotVector;

  SoMFFloat vKnotVector;

  SoMFFloat sKnotVector;

  SoMFFloat tKnotVector;

  SoNurbsSurface();

 private:
  virtual void GLRender(SoGLRenderAction *action);
  virtual void rayPick(SoRayPickAction *action);
  virtual void getPrimitiveCount(SoGetPrimitiveCountAction *action);
  virtual void getBoundingBox(SoGetBoundingBoxAction *action);

  // Computes bounding box of surface
  virtual void computeBBox(SoAction *action, SbBox3f &box, SbVec3f &center);

 private:
  static void initClass();
  static void exitClass();

  SbBool needBREPUpdate(SoNurbsBREPAction *action);
  void invalidateCache();
  void fillBREP(SoAction *action, SoBrep *brep,
                SbBool doTexture, SoNurbsGroup::NurbsProperty &nurbsProperty);

  SoNurbsSurfaceCache *getNurbsCache() const { return nurbsCache; }
  SoNurbsSurfaceCache *getNurbsCacheUVs() const { return nurbsCacheUVs; }

  // Function to compute complexity from Complexity
 static int computeSteps(SoState *state);

 private:
  // Generates triangles representing a surface
  virtual void generatePrimitives(SoAction *action);

  float setTesselationParams(
    SoAction* action,
    const SoNurbsGroup::NurbsProperty &nurbsProperty,
    int steps,
    Pquad_tess_param &quad_tess_param);

  ~SoNurbsSurface();


 private:
  SoNurbsSurfaceCache *nurbsCache;
  SoNurbsSurfaceCache *nurbsCacheUVs;

  SbThreadRWMutex       *nurbsCacheMutex;

  int isValid(SoState *state, SbBool renderAction);

  // Tessellate the surface
  void tesselateNURBS_G5G(SoAction *action,
                          SbBool doTextures,
                          int32_t steps,
                          SoBrep *brep,
                          SoNurbsGroup::NurbsProperty &nurbsProperty);
  void tesselateNURBS_G5G(SoAction *action, SbBool doTextures, int32_t steps);

  // Renders the surface
  void drawNURBS_G5G(SoAction *action, SbBool doTextures, int32_t steps);

  // Renders the surface
  void drawNURBS_GLU(GLUnurbs *nurbsObj, SoState *state, SbBool doTextures);

  // Function to compute complexity decimation elements
  int computePixelTolerance(SoState *state);

  // Function to compute complexity from Complexity in screen space
  int computeScreenSpaceSteps(SoState *state);

  void createNurbsCache(SoState *state, SbBool isShadered);

  // VBO management
  inline SoVBOMgr     *getVBOMgr() const
  { return (SoVBOMgr*)(m_VBOMgr.getValue()); }
  SoVBOMgr* allocateVBO(SoState* state);
  void deleteVBO(SoState *state);

  SbThreadStorage<SoVBOMgr*>  m_VBOMgr;
};

#endif /* _SO_NURBS_SURFACE_ */

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Open Inventor Toolkit reference manual, generated on 12 Feb 2024
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