[GLU32]

[reactos.git] / reactos / dll / opengl / glu32 / src / libtess / geom.h

diff --git a/reactos/dll/opengl/glu32/src/libtess/geom.h b/reactos/dll/opengl/glu32/src/libtess/geom.h
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+++ b/reactos/dll/opengl/glu32/src/libtess/geom.h
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+/*
+ * 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