| /* |
| ** License Applicability. Except to the extent portions of this file are |
| ** made subject to an alternative license as permitted in the SGI Free |
| ** Software License B, Version 1.1 (the "License"), the contents of this |
| ** file are subject only to the provisions of the License. You may not use |
| ** this file except in compliance with the License. You may obtain a copy |
| ** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600 |
| ** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at: |
| ** |
| ** http://oss.sgi.com/projects/FreeB |
| ** |
| ** Note that, as provided in the License, the Software is distributed on an |
| ** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS |
| ** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND |
| ** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A |
| ** PARTICULAR PURPOSE, AND NON-INFRINGEMENT. |
| ** |
| ** Original Code. The Original Code is: OpenGL Sample Implementation, |
| ** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics, |
| ** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc. |
| ** Copyright in any portions created by third parties is as indicated |
| ** elsewhere herein. All Rights Reserved. |
| ** |
| ** Additional Notice Provisions: The application programming interfaces |
| ** established by SGI in conjunction with the Original Code are The |
| ** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released |
| ** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version |
| ** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X |
| ** Window System(R) (Version 1.3), released October 19, 1998. This software |
| ** was created using the OpenGL(R) version 1.2.1 Sample Implementation |
| ** published by SGI, but has not been independently verified as being |
| ** compliant with the OpenGL(R) version 1.2.1 Specification. |
| ** |
| */ |
| /* |
| ** Author: Eric Veach, July 1994. |
| ** |
| ** $Date$ $Revision$ |
| ** $Header: //depot/main/gfx/lib/glu/libtess/geom.h#5 $ |
| */ |
| |
| #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 ) |
| |
| #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 |