src/glu/sgi/libtess/geom.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 ** Author: Eric Veach, July 1994.
  37 **
  38 ** $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
  39 ** $Header: /home/krh/git/sync/mesa-cvs-repo/Mesa/src/glu/sgi/libtess/geom.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
  40 */
  41
  42 #ifndef __geom_h_
  43 #define __geom_h_
  44
  45 #include "mesh.h"
  46
  47 #ifdef NO_BRANCH_CONDITIONS
  48 /* MIPS architecture has special instructions to evaluate boolean
  49  * conditions -- more efficient than branching, IF you can get the
  50  * compiler to generate the right instructions (SGI compiler doesn't)
  51  */
  52 #define VertEq(u,v)     (((u)->s == (v)->s) & ((u)->t == (v)->t))
  53 #define VertLeq(u,v)    (((u)->s < (v)->s) | \
  54                          ((u)->s == (v)->s & (u)->t <= (v)->t))
  55 #else
  56 #define VertEq(u,v)     ((u)->s == (v)->s && (u)->t == (v)->t)
  57 #define VertLeq(u,v)    (((u)->s < (v)->s) || \
  58                          ((u)->s == (v)->s && (u)->t <= (v)->t))
  59 #endif
  60
  61 #define EdgeEval(u,v,w) __gl_edgeEval(u,v,w)
  62 #define EdgeSign(u,v,w) __gl_edgeSign(u,v,w)
  63
  64 /* Versions of VertLeq, EdgeSign, EdgeEval with s and t transposed. */
  65
  66 #define TransLeq(u,v)   (((u)->t < (v)->t) || \
  67                          ((u)->t == (v)->t && (u)->s <= (v)->s))
  68 #define TransEval(u,v,w)        __gl_transEval(u,v,w)
  69 #define TransSign(u,v,w)        __gl_transSign(u,v,w)
  70
  71
  72 #define EdgeGoesLeft(e)         VertLeq( (e)->Dst, (e)->Org )
  73 #define EdgeGoesRight(e)        VertLeq( (e)->Org, (e)->Dst )
  74
  75 #define ABS(x)  ((x) < 0 ? -(x) : (x))
  76 #define VertL1dist(u,v) (ABS(u->s - v->s) + ABS(u->t - v->t))
  77
  78 #define VertCCW(u,v,w)  __gl_vertCCW(u,v,w)
  79
  80 int             __gl_vertLeq( GLUvertex *u, GLUvertex *v );
  81 GLdouble        __gl_edgeEval( GLUvertex *u, GLUvertex *v, GLUvertex *w );
  82 GLdouble        __gl_edgeSign( GLUvertex *u, GLUvertex *v, GLUvertex *w );
  83 GLdouble        __gl_transEval( GLUvertex *u, GLUvertex *v, GLUvertex *w );
  84 GLdouble        __gl_transSign( GLUvertex *u, GLUvertex *v, GLUvertex *w );
  85 int             __gl_vertCCW( GLUvertex *u, GLUvertex *v, GLUvertex *w );
  86 void            __gl_edgeIntersect( GLUvertex *o1, GLUvertex *d1,
  87                                     GLUvertex *o2, GLUvertex *d2,
  88                                     GLUvertex *v );
  89
  90 #endif