/* | |

** SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008) | |

** Copyright (C) [dates of first publication] 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) tesedgeEval(u,v,w) | |

#define EdgeSign(u,v,w) tesedgeSign(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) testransEval(u,v,w) | |

#define TransSign(u,v,w) testransSign(u,v,w) | |

#define EdgeGoesLeft(e) VertLeq( (e)->Dst, (e)->Org ) | |

#define EdgeGoesRight(e) VertLeq( (e)->Org, (e)->Dst ) | |

#define EdgeIsInternal(e) e->Rface && e->Rface->inside | |

#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) tesvertCCW(u,v,w) | |

int tesvertLeq( TESSvertex *u, TESSvertex *v ); | |

TESSreal tesedgeEval( TESSvertex *u, TESSvertex *v, TESSvertex *w ); | |

TESSreal tesedgeSign( TESSvertex *u, TESSvertex *v, TESSvertex *w ); | |

TESSreal testransEval( TESSvertex *u, TESSvertex *v, TESSvertex *w ); | |

TESSreal testransSign( TESSvertex *u, TESSvertex *v, TESSvertex *w ); | |

int tesvertCCW( TESSvertex *u, TESSvertex *v, TESSvertex *w ); | |

void tesedgeIntersect( TESSvertex *o1, TESSvertex *d1, TESSvertex *o2, TESSvertex *d2, TESSvertex *v ); | |

int tesedgeIsLocallyDelaunay( TESShalfEdge *e ); | |

#endif |