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src/libtess2/geom.h

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00001 /*
00002 ** SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008) 
00003 ** Copyright (C) [dates of first publication] Silicon Graphics, Inc.
00004 ** All Rights Reserved.
00005 **
00006 ** Permission is hereby granted, free of charge, to any person obtaining a copy
00007 ** of this software and associated documentation files (the "Software"), to deal
00008 ** in the Software without restriction, including without limitation the rights
00009 ** to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
00010 ** of the Software, and to permit persons to whom the Software is furnished to do so,
00011 ** subject to the following conditions:
00012 ** 
00013 ** The above copyright notice including the dates of first publication and either this
00014 ** permission notice or a reference to http://oss.sgi.com/projects/FreeB/ shall be
00015 ** included in all copies or substantial portions of the Software. 
00016 **
00017 ** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
00018 ** INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
00019 ** PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL SILICON GRAPHICS, INC.
00020 ** BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
00021 ** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
00022 ** OR OTHER DEALINGS IN THE SOFTWARE.
00023 ** 
00024 ** Except as contained in this notice, the name of Silicon Graphics, Inc. shall not
00025 ** be used in advertising or otherwise to promote the sale, use or other dealings in
00026 ** this Software without prior written authorization from Silicon Graphics, Inc.
00027 */
00028 /*
00029 ** Author: Eric Veach, July 1994.
00030 */
00031 
00032 #ifndef GEOM_H
00033 #define GEOM_H
00034 
00035 #include "mesh.h"
00036 
00037 #ifdef NO_BRANCH_CONDITIONS
00038 /* MIPS architecture has special instructions to evaluate boolean
00039 * conditions -- more efficient than branching, IF you can get the
00040 * compiler to generate the right instructions (SGI compiler doesn't)
00041 */
00042 #define VertEq(u,v) (((u)->s == (v)->s) & ((u)->t == (v)->t))
00043 #define VertLeq(u,v)    (((u)->s < (v)->s) | \
00044     ((u)->s == (v)->s & (u)->t <= (v)->t))
00045 #else
00046 #define VertEq(u,v) ((u)->s == (v)->s && (u)->t == (v)->t)
00047 #define VertLeq(u,v) (((u)->s < (v)->s) || ((u)->s == (v)->s && (u)->t <= (v)->t))
00048 #endif
00049 
00050 #define EdgeEval(u,v,w) tesedgeEval(u,v,w)
00051 #define EdgeSign(u,v,w) tesedgeSign(u,v,w)
00052 
00053 /* Versions of VertLeq, EdgeSign, EdgeEval with s and t transposed. */
00054 
00055 #define TransLeq(u,v) (((u)->t < (v)->t) || ((u)->t == (v)->t && (u)->s <= (v)->s))
00056 #define TransEval(u,v,w) testransEval(u,v,w)
00057 #define TransSign(u,v,w) testransSign(u,v,w)
00058 
00059 
00060 #define EdgeGoesLeft(e) VertLeq( (e)->Dst, (e)->Org )
00061 #define EdgeGoesRight(e) VertLeq( (e)->Org, (e)->Dst )
00062 
00063 #define ABS(x) ((x) < 0 ? -(x) : (x))
00064 #define VertL1dist(u,v) (ABS(u->s - v->s) + ABS(u->t - v->t))
00065 
00066 #define VertCCW(u,v,w) tesvertCCW(u,v,w)
00067 
00068 int tesvertLeq( TESSvertex *u, TESSvertex *v );
00069 TESSreal    tesedgeEval( TESSvertex *u, TESSvertex *v, TESSvertex *w );
00070 TESSreal    tesedgeSign( TESSvertex *u, TESSvertex *v, TESSvertex *w );
00071 TESSreal    testransEval( TESSvertex *u, TESSvertex *v, TESSvertex *w );
00072 TESSreal    testransSign( TESSvertex *u, TESSvertex *v, TESSvertex *w );
00073 int tesvertCCW( TESSvertex *u, TESSvertex *v, TESSvertex *w );
00074 void tesedgeIntersect( TESSvertex *o1, TESSvertex *d1, TESSvertex *o2, TESSvertex *d2, TESSvertex *v );
00075 
00076 #endif