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