SGI SI GLU library

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diff --git a/src/glu/sgi/libnurbs/nurbtess/monoTriangulation.h b/src/glu/sgi/libnurbs/nurbtess/monoTriangulation.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.
+**
+** $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+*/
+/*
+** $Header: /home/krh/git/sync/mesa-cvs-repo/Mesa/src/glu/sgi/libnurbs/nurbtess/monoTriangulation.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
+*/
+
+#ifndef _MONO_TRIANGULATION_H
+#define _MONO_TRIANGULATION_H
+
+#include "definitions.h"
+#include "primitiveStream.h"
+#include "directedLine.h"
+
+class Backend;
+class Arc;
+typedef Arc *Arc_ptr;
+
+class reflexChain{
+  Real2 *queue; 
+  /*the order of the polygon vertices: either q[0],q[1].., or 
+   * q[n-1], q[n-2], ..., q[0]
+   *this order determines the interior of the polygon, so it
+   *also used to determines whether a chain is reflex or convex
+   */
+  Int isIncreasing; 
+  Int index_queue;
+  Int size_queue; /*allocated size*/
+  
+public:
+  reflexChain(Int size, Int isIncreasing);
+  ~reflexChain();
+  
+  void insert(Real u, Real v);
+  void insert(Real v[2]);
+  
+  void processNewVertex(Real v[2], primStream* pStream);
+  void outputFan(Real v[2], primStream* pStream);
+
+  void processNewVertex(Real v[2], Backend* backend);
+  void outputFan(Real v[2], Backend* backend);
+
+  void print();
+};
+
+/*dynamic array of pointers to reals.
+ *Intended to store an array of (u,v).
+ *Notice that it doesn't allocate or dealocate the space
+ *for the (u,v) themselfs. So it assums that someone else 
+ *is taking care of them, while this class only plays with
+ *the pointers.
+ */
+class vertexArray{
+  Real** array;
+  Int index;
+  Int size;
+public:
+  vertexArray(Int s);
+  vertexArray(Real vertices[][2], Int nVertices);
+  ~vertexArray();
+  void appendVertex(Real* ptr); /*the content (pointed by ptr is NOT copied*/
+  Real* getVertex(Int i) {return array[i];}
+  Real** getArray() {return array;}
+  Int getNumElements() {return index;}
+  Int findIndexAbove(Real v);
+  Int findIndexAboveGen(Real v, Int startIndex, Int EndIndex);
+  Int findIndexBelowGen(Real v, Int startIndex, Int EndIndex);
+  Int findIndexStrictBelowGen(Real v, Int startIndex, Int EndIndex);
+  Int findIndexFirstAboveEqualGen(Real v, Int startIndex, Int endIndex);
+  Int skipEqualityFromStart(Real v, Int start, Int end);
+  //return i such that fron [i+1, end] is strictly U-monotone (left to right
+  Int findDecreaseChainFromEnd(Int begin, Int end);
+  void print();
+};
+
+void monoTriangulation(directedLine* monoPolygon, primStream* pStream);
+
+void monoTriangulationRec(Real* topVertex, Real* botVertex, 
+			  vertexArray* inc_chain, Int inc_current,
+			  vertexArray* dec_chain, Int dec_current,
+			  primStream* pStream);
+
+void monoTriangulationRec(directedLine* inc_chain, Int inc_index, 
+			  directedLine* dec_chain, Int dec_index, 
+			  directedLine* topVertex, Int top_index,
+			  directedLine* botVertex,
+			  primStream* pStream);
+
+/*the chain could be increasing or decreasing, although we use the
+ * name inc_chain.
+ *the argument  is_increase_chain indicates whether this chain
+ *is increasing (left chain in V-monotone case) or decreaing (right chain
+ *in V-monotone case).
+ */
+void monoTriangulation2(Real* topVertex, Real* botVertex, 
+			vertexArray* inc_chain, Int inc_smallIndex,
+			Int inc_largeIndex,
+			Int is_increase_chain,
+			primStream* pStream);
+void monoTriangulationRecGen(Real* topVertex, Real* botVertex, 
+			  vertexArray* inc_chain, Int inc_current, Int inc_end,
+			  vertexArray* dec_chain, Int dec_current, Int dec_end,
+			  primStream* pStream); 
+
+void monoTriangulationRecGenOpt(Real* topVertex, Real* botVertex, 
+			  vertexArray* inc_chain, Int inc_current, Int inc_end,
+			  vertexArray* dec_chain, Int dec_current, Int dec_end,
+			  primStream* pStream); 
+
+void triangulateXYMonoTB(Int n_left, Real** leftVerts,
+		       Int n_right, Real** rightVerts,
+		       primStream* pStream);
+
+void monoTriangulationRecGenTBOpt(Real* topVertex, Real* botVertex, 
+			  vertexArray* inc_chain, Int inc_current, Int inc_end,
+			  vertexArray* dec_chain, Int dec_current, Int dec_end,
+			  primStream* pStream);
+
+void monoTriangulationRecOpt(Real* topVertex, Real* botVertex, 
+			     vertexArray* left_chain, Int left_current,
+			     vertexArray* right_chain, Int right_current,
+			     primStream* pStream);
+
+void monoTriangulationRecFunGen(Real* topVertex, Real* botVertex, 
+			  vertexArray* inc_chain, Int inc_current, Int inc_end,
+			  vertexArray* dec_chain, Int dec_current, Int dec_end,
+			  Int  (*compFun)(Real*, Real*),
+			  primStream* pStream);
+
+void monoTriangulationRecFun(Real* topVertex, Real* botVertex, 
+			  vertexArray* inc_chain, Int inc_current,
+			  vertexArray* dec_chain, Int dec_current,
+			   Int (*compFun)(Real*, Real*),
+			  primStream* pStream);
+void monoTriangulationFun(directedLine* monoPolygon, 
+			  Int (*compFun)(Real*, Real*), primStream* pStream);
+
+
+
+
+void monoTriangulationRec(Real* topVertex, Real* botVertex, 
+			  vertexArray* inc_chain, Int inc_current,
+			  vertexArray* dec_chain, Int dec_current,
+			  Backend* backend);
+
+void monoTriangulationFunBackend(Arc_ptr loop, Int (*compFun)(Real*, Real*), Backend* backend);
+
+void monoTriangulationRecFunBackend(Real* topVertex, Real* botVertex, 
+			  vertexArray* inc_chain, Int inc_current,
+			  vertexArray* dec_chain, Int dec_current,
+			  Int  (*compFun)(Real*, Real*),
+			  Backend* backend);
+
+void monoTriangulationOpt(directedLine* poly, primStream* pStream);
+
+#endif
+
+
+
+