| /* |
| * 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 |