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

   1 /*
   2  * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
   3  * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
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   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice including the dates of first publication and
  13  * either this permission notice or a reference to
  14  * http://oss.sgi.com/projects/FreeB/
  15  * shall be included in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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  22  * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23  * SOFTWARE.
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  29  */
  30
  31 /*
  32  * trimvertex.h
  33  *
  34  * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
  35  * $Header: /home/krh/git/sync/mesa-cvs-repo/Mesa/src/glu/sgi/libnurbs/internals/trimvertex.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
  36  */
  37
  38 #ifndef __glutrimvertex_h_
  39 #define __glutrimvertex_h_
  40
  41 #include "types.h"
  42
  43 /*#define USE_OPTTT*/
  44
  45 class TrimVertex { /* a vertex on a trim curve */
  46 public:
  47     REAL                param[2];       /* parametric space coords */
  48 #ifdef USE_OPTTT
  49     REAL                cache_point[4]; //only when USE_OPTTT is on in slicer.c++
  50     REAL                cache_normal[3];
  51 #endif
  52     long                nuid;
  53 };
  54
  55 typedef class TrimVertex *TrimVertex_p;
  56
  57 inline REAL
  58 det3( TrimVertex *a, TrimVertex *b, TrimVertex *c )
  59 {
  60     return a->param[0] * (b->param[1]-c->param[1]) +
  61            b->param[0] * (c->param[1]-a->param[1]) +
  62            c->param[0] * (a->param[1]-b->param[1]);
  63 }
  64
  65 #endif /* __glutrimvertex_h_ */