src/glu/sgi/libnurbs/internals/trimvertex.h

   1 /*
   2 ** License Applicability. Except to the extent portions of this file are
   3 ** made subject to an alternative license as permitted in the SGI Free
   4 ** Software License B, Version 1.1 (the "License"), the contents of this
   5 ** file are subject only to the provisions of the License. You may not use
   6 ** this file except in compliance with the License. You may obtain a copy
   7 ** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
   8 ** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
   9 **
  10 ** http://oss.sgi.com/projects/FreeB
  11 **
  12 ** Note that, as provided in the License, the Software is distributed on an
  13 ** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
  14 ** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
  15 ** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
  16 ** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
  17 **
  18 ** Original Code. The Original Code is: OpenGL Sample Implementation,
  19 ** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
  20 ** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
  21 ** Copyright in any portions created by third parties is as indicated
  22 ** elsewhere herein. All Rights Reserved.
  23 **
  24 ** Additional Notice Provisions: The application programming interfaces
  25 ** established by SGI in conjunction with the Original Code are The
  26 ** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
  27 ** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
  28 ** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
  29 ** Window System(R) (Version 1.3), released October 19, 1998. This software
  30 ** was created using the OpenGL(R) version 1.2.1 Sample Implementation
  31 ** published by SGI, but has not been independently verified as being
  32 ** compliant with the OpenGL(R) version 1.2.1 Specification.
  33 */
  34
  35 /*
  36  * trimvertex.h
  37  *
  38  */
  39
  40 #ifndef __glutrimvertex_h_
  41 #define __glutrimvertex_h_
  42
  43 #include "types.h"
  44
  45 /*#define USE_OPTTT*/
  46
  47 class TrimVertex { /* a vertex on a trim curve */
  48 public:
  49     REAL                param[2];       /* parametric space coords */
  50 #ifdef USE_OPTTT
  51     REAL                cache_point[4]; //only when USE_OPTTT is on in slicer.c++
  52     REAL                cache_normal[3];
  53 #endif
  54     long                nuid;
  55 };
  56
  57 typedef class TrimVertex *TrimVertex_p;
  58
  59 inline REAL
  60 det3( TrimVertex *a, TrimVertex *b, TrimVertex *c )
  61 {
  62     return a->param[0] * (b->param[1]-c->param[1]) +
  63            b->param[0] * (c->param[1]-a->param[1]) +
  64            c->param[0] * (a->param[1]-b->param[1]);
  65 }
  66
  67 #endif /* __glutrimvertex_h_ */