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90 lines
3.6 KiB
C
90 lines
3.6 KiB
C
/*
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** License Applicability. Except to the extent portions of this file are
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** made subject to an alternative license as permitted in the SGI Free
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** Software License B, Version 1.1 (the "License"), the contents of this
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** file are subject only to the provisions of the License. You may not use
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** this file except in compliance with the License. You may obtain a copy
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** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
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** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
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**
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** http://oss.sgi.com/projects/FreeB
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**
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** Note that, as provided in the License, the Software is distributed on an
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** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
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** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
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** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
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** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
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**
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** Original Code. The Original Code is: OpenGL Sample Implementation,
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** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
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** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
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** Copyright in any portions created by third parties is as indicated
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** elsewhere herein. All Rights Reserved.
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**
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** Additional Notice Provisions: The application programming interfaces
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** established by SGI in conjunction with the Original Code are The
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** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
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** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
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** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
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** Window System(R) (Version 1.3), released October 19, 1998. This software
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** was created using the OpenGL(R) version 1.2.1 Sample Implementation
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** published by SGI, but has not been independently verified as being
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** compliant with the OpenGL(R) version 1.2.1 Specification.
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**
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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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*/
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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) || \
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((u)->s == (v)->s && (u)->t <= (v)->t))
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#endif
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#define EdgeEval(u,v,w) __gl_edgeEval(u,v,w)
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#define EdgeSign(u,v,w) __gl_edgeSign(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) || \
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((u)->t == (v)->t && (u)->s <= (v)->s))
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#define TransEval(u,v,w) __gl_transEval(u,v,w)
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#define TransSign(u,v,w) __gl_transSign(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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#undef ABS
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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) __gl_vertCCW(u,v,w)
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int __gl_vertLeq( GLUvertex *u, GLUvertex *v );
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GLdouble __gl_edgeEval( GLUvertex *u, GLUvertex *v, GLUvertex *w );
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GLdouble __gl_edgeSign( GLUvertex *u, GLUvertex *v, GLUvertex *w );
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GLdouble __gl_transEval( GLUvertex *u, GLUvertex *v, GLUvertex *w );
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GLdouble __gl_transSign( GLUvertex *u, GLUvertex *v, GLUvertex *w );
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int __gl_vertCCW( GLUvertex *u, GLUvertex *v, GLUvertex *w );
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void __gl_edgeIntersect( GLUvertex *o1, GLUvertex *d1,
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GLUvertex *o2, GLUvertex *d2,
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GLUvertex *v );
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#endif
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