Butterbur: Tesselation support for filling closed paths

[sdk] / deps / libtess / geom.h

diff --git a/deps/libtess/geom.h b/deps/libtess/geom.h
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+/*
+** 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.
+**
+*/
+
+#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