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79 lines
3.3 KiB
C
79 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) [dates of first publication] Silicon Graphics, Inc.
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** All Rights Reserved.
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**
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** Permission is hereby granted, free of charge, to any person obtaining a copy
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** of this software and associated documentation files (the "Software"), to deal
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** in the Software without restriction, including without limitation the rights
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** to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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** of the Software, and to permit persons to whom the Software is furnished to do so,
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** subject to the following conditions:
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**
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** The above copyright notice including the dates of first publication and either this
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** permission notice or a reference to http://oss.sgi.com/projects/FreeB/ shall be
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** 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 OR IMPLIED,
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** INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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** PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL SILICON GRAPHICS, INC.
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** BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
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** OR OTHER DEALINGS IN THE SOFTWARE.
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**
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** Except as contained in this notice, the name of Silicon Graphics, Inc. shall not
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** be used in advertising or otherwise to promote the sale, use or other dealings in
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** this Software without prior written authorization from 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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#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) || ((u)->s == (v)->s && (u)->t <= (v)->t))
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#endif
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#define EdgeEval(u,v,w) tesedgeEval(u,v,w)
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#define EdgeSign(u,v,w) tesedgeSign(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) || ((u)->t == (v)->t && (u)->s <= (v)->s))
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#define TransEval(u,v,w) testransEval(u,v,w)
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#define TransSign(u,v,w) testransSign(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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#define EdgeIsInternal(e) e->Rface && e->Rface->inside
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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) tesvertCCW(u,v,w)
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int tesvertLeq( TESSvertex *u, TESSvertex *v );
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TESSreal tesedgeEval( TESSvertex *u, TESSvertex *v, TESSvertex *w );
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TESSreal tesedgeSign( TESSvertex *u, TESSvertex *v, TESSvertex *w );
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TESSreal testransEval( TESSvertex *u, TESSvertex *v, TESSvertex *w );
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TESSreal testransSign( TESSvertex *u, TESSvertex *v, TESSvertex *w );
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int tesvertCCW( TESSvertex *u, TESSvertex *v, TESSvertex *w );
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void tesedgeIntersect( TESSvertex *o1, TESSvertex *d1, TESSvertex *o2, TESSvertex *d2, TESSvertex *v );
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int tesedgeIsLocallyDelaunay( TESShalfEdge *e );
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#endif
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