00001 /*=======================================================================
00002  * Copyright 1991-1996, Silicon Graphics, Inc.
00003  * ALL RIGHTS RESERVED
00004  *
00005  * UNPUBLISHED -- Rights reserved under the copyright laws of the United
00006  * States.   Use of a copyright notice is precautionary only and does not
00007  * imply publication or disclosure.
00008  *
00009  * U.S. GOVERNMENT RESTRICTED RIGHTS LEGEND:
00010  * Use, duplication or disclosure by the Government is subject to restrictions
00011  * as set forth in FAR 52.227.19(c)(2) or subparagraph (c)(1)(ii) of the Rights
00012  * in Technical Data and Computer Software clause at DFARS 252.227-7013 and/or
00013  * in similar or successor clauses in the FAR, or the DOD or NASA FAR
00014  * Supplement.  Contractor/manufacturer is Silicon Graphics, Inc.,
00015  * 2011 N. Shoreline Blvd. Mountain View, CA 94039-7311.
00016  *
00017  * THE CONTENT OF THIS WORK CONTAINS CONFIDENTIAL AND PROPRIETARY
00018  * INFORMATION OF SILICON GRAPHICS, INC. ANY DUPLICATION, MODIFICATION,
00019  * DISTRIBUTION, OR DISCLOSURE IN ANY FORM, IN WHOLE, OR IN PART, IS STRICTLY
00020  * PROHIBITED WITHOUT THE PRIOR EXPRESS WRITTEN PERMISSION OF SILICON
00021  * GRAPHICS, INC.
00022 **=======================================================================*/
00023 /*=======================================================================
00024 ** Author      : Dave Immel (MMM yyyy)
00025 **=======================================================================*/
00026 /*=======================================================================
00027  *** THE CONTENT OF THIS WORK IS PROPRIETARY TO FEI S.A.S, (FEI S.A.S.),            ***
00028  ***              AND IS DISTRIBUTED UNDER A LICENSE AGREEMENT.                     ***
00029  ***                                                                                ***
00030  ***  REPRODUCTION, DISCLOSURE,  OR USE,  IN WHOLE OR IN PART,  OTHER THAN AS       ***
00031  ***  SPECIFIED  IN THE LICENSE ARE  NOT TO BE  UNDERTAKEN  EXCEPT WITH PRIOR       ***
00032  ***  WRITTEN AUTHORIZATION OF FEI S.A.S.                                           ***
00033  ***                                                                                ***
00034  ***                        RESTRICTED RIGHTS LEGEND                                ***
00035  ***  USE, DUPLICATION, OR DISCLOSURE BY THE GOVERNMENT OF THE CONTENT OF THIS      ***
00036  ***  WORK OR RELATED DOCUMENTATION IS SUBJECT TO RESTRICTIONS AS SET FORTH IN      ***
00037  ***  SUBPARAGRAPH (C)(1) OF THE COMMERCIAL COMPUTER SOFTWARE RESTRICTED RIGHT      ***
00038  ***  CLAUSE  AT FAR 52.227-19  OR SUBPARAGRAPH  (C)(1)(II)  OF  THE RIGHTS IN      ***
00039  ***  TECHNICAL DATA AND COMPUTER SOFTWARE CLAUSE AT DFARS 52.227-7013.             ***
00040  ***                                                                                ***
00041  ***                   COPYRIGHT (C) 1996-2020 BY FEI S.A.S,                        ***
00042  ***                        BORDEAUX, FRANCE                                        ***
00043  ***                      ALL RIGHTS RESERVED                                       ***
00044 **=======================================================================*/
00045 /*=======================================================================
00046 ** Modified by : VSG (MMM YYYY)
00047 **=======================================================================*/
00048 
00049 
00050 #ifndef  _SO_INDEXED_NURBS_CURVE_
00051 #define  _SO_INDEXED_NURBS_CURVE_
00052 
00053 #include <Inventor/fields/SoSFInt32.h>
00054 #include <Inventor/fields/SoMFFloat.h>
00055 #include <Inventor/fields/SoMFInt32.h>
00056 #include <Inventor/nodes/SoShape.h>
00057 
00059 //
00060 //  Class: SoIndexedNurbsCurve
00061 //
00062 //  NURBS curve using an indexed list for the control points.
00063 //
00065 
00066 class SoState;
00067 class SoIndexedNurbsCurveCache;
00068 class SbThreadRWMutex;
00069 
00137 class  SoIndexedNurbsCurve : public SoShape {
00138   
00139   SO_NODE_HEADER(SoIndexedNurbsCurve);
00140   
00141  public:
00146   SoSFInt32 numControlPoints;
00150   SoMFInt32 coordIndex;
00151 
00155   SoMFFloat knotVector;
00156 
00160   SoIndexedNurbsCurve();
00161 
00162  private:
00163   virtual void GLRender(SoGLRenderAction *action);
00164   virtual void rayPick(SoRayPickAction *action);
00165   virtual void getPrimitiveCount(SoGetPrimitiveCountAction *action);
00166   
00167   // Redefine this to tell open caches that they contain lines
00168   virtual void  getBoundingBox(SoGetBoundingBoxAction *action);
00169   
00170   // Computes bounding box of curve
00171   virtual void computeBBox(SoAction *action, SbBox3f &box,
00172                            SbVec3f &center);
00173   
00174  private:
00175   static void initClass();
00176   static void exitClass();
00177   
00178  private:
00179   // Generates triangles representing curve
00180   virtual void generatePrimitives(SoAction *action);
00181   
00182   ~SoIndexedNurbsCurve();
00183   
00184  private:
00185   SoIndexedNurbsCurveCache *nurbsCache;
00186   SbThreadRWMutex       *nurbsCacheMutex;
00187   int isValid(SoState *state);
00188   
00189   // Tessellate the surface
00190   void tesselateNURBS_G5G(SoAction *action, int32_t steps);
00191   // Render the surface
00192   void drawNURBS_G5G(SoAction *action, int32_t steps);
00193   
00194   // Functions to compute complexity from Complexity
00195   // and decimation elements
00196   int computeSteps(SoState *state);
00197   int computeScreenSpaceSteps(SoState *state);
00198   
00199   void invalidateCache();
00200   void createNurbsCache(SoState *state);
00201 };
00202 
00203 #endif /* _SO_INDEXED_NURBS_CURVE_ */
00204 
00205
Inventor/nodes/SoIndexedNurbsCurve.h
