IABSD.fr/xenocara/lib/libGLU/src/libtess/geom.h

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• Author : jsg
  Date : 2013-09-01 03:51:12
  Hash : 729f7da4
  Message : Update to GLU 9.0.0, GLU was previously part of Mesa but is now seperate. tested in a ports bulk build by landry@, ok matthieu@

• lib/libGLU/src/libtess/geom.h

• /*
   * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
   * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
   *
   * Permission is hereby granted, free of charge, to any person obtaining a
   * copy of this software and associated documentation files (the "Software"),
   * to deal in the Software without restriction, including without limitation
   * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   * and/or sell copies of the Software, and to permit persons to whom the
   * Software is furnished to do so, subject to the following conditions:
   *
   * The above copyright notice including the dates of first publication and
   * either this permission notice or a reference to
   * http://oss.sgi.com/projects/FreeB/
   * shall be included in all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
   * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
   * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
   * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE.
   *
   * Except as contained in this notice, the name of Silicon Graphics, Inc.
   * shall not be used in advertising or otherwise to promote the sale, use or
   * other dealings in this Software without prior written authorization from
   * Silicon Graphics, Inc.
   */
  /*
  ** Author: Eric Veach, July 1994.
  **
  */
  
  #ifndef __geom_h_
  #define __geom_h_
  
  #include "mesh.h"
  
  #ifdef NO_BRANCH_CONDITIONS
  /* MIPS architecture has special instructions to evaluate boolean
   * conditions -- more efficient than branching, IF you can get the
   * compiler to generate the right instructions (SGI compiler doesn't)
   */
  #define VertEq(u,v)	(((u)->s == (v)->s) & ((u)->t == (v)->t))
  #define VertLeq(u,v)	(((u)->s < (v)->s) | \
                           ((u)->s == (v)->s & (u)->t <= (v)->t))
  #else
  #define VertEq(u,v)	((u)->s == (v)->s && (u)->t == (v)->t)
  #define VertLeq(u,v)	(((u)->s < (v)->s) || \
                           ((u)->s == (v)->s && (u)->t <= (v)->t))
  #endif
  
  #define EdgeEval(u,v,w) __gl_edgeEval(u,v,w)
  #define EdgeSign(u,v,w) __gl_edgeSign(u,v,w)
  
  /* Versions of VertLeq, EdgeSign, EdgeEval with s and t transposed. */
  
  #define TransLeq(u,v)	(((u)->t < (v)->t) || \
                           ((u)->t == (v)->t && (u)->s <= (v)->s))
  #define TransEval(u,v,w)	__gl_transEval(u,v,w)
  #define TransSign(u,v,w)	__gl_transSign(u,v,w)
  
  
  #define EdgeGoesLeft(e) 	VertLeq( (e)->Dst, (e)->Org )
  #define EdgeGoesRight(e)	VertLeq( (e)->Org, (e)->Dst )
  
  #undef	ABS
  #define ABS(x)	((x) < 0 ? -(x) : (x))
  #define VertL1dist(u,v) (ABS(u->s - v->s) + ABS(u->t - v->t))
  
  #define VertCCW(u,v,w)	__gl_vertCCW(u,v,w)
  
  int		__gl_vertLeq( GLUvertex *u, GLUvertex *v );
  GLdouble	__gl_edgeEval( GLUvertex *u, GLUvertex *v, GLUvertex *w );
  GLdouble	__gl_edgeSign( GLUvertex *u, GLUvertex *v, GLUvertex *w );
  GLdouble	__gl_transEval( GLUvertex *u, GLUvertex *v, GLUvertex *w );
  GLdouble	__gl_transSign( GLUvertex *u, GLUvertex *v, GLUvertex *w );
  int		__gl_vertCCW( GLUvertex *u, GLUvertex *v, GLUvertex *w );
  void		__gl_edgeIntersect( GLUvertex *o1, GLUvertex *d1,
  				    GLUvertex *o2, GLUvertex *d2,
  				    GLUvertex *v );
  
  #endif