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diff --git a/src/glu/sgi/libnurbs/nurbtess/monoChain.h b/src/glu/sgi/libnurbs/nurbtess/monoChain.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/monoChain.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
+*/
+
+#ifndef _MONO_CHAIN_H
+#define _MONO_CHAIN_H
+
+#include "directedLine.h"
+#include "partitionY.h"
+
+class monoChain;
+
+class monoChain{
+  directedLine* chainHead;
+  directedLine* chainTail;
+  monoChain* next;
+  monoChain* prev;
+  monoChain* nextPolygon; //a list of polygons
+  
+  //cached informatin
+  //bounding box
+  Real minX, maxX, minY, maxY;
+  Int isIncrease;
+  
+  //for efficiently comparing two chains
+
+  directedLine* current;
+  
+public:
+  monoChain(directedLine* cHead, directedLine* cTail);
+  ~monoChain() {}
+  
+  inline  void setNext(monoChain* n) {next = n;}
+  inline void setPrev(monoChain* p) {prev = p;}
+  inline void setNextPolygon(monoChain* np) {nextPolygon = np;}
+  inline monoChain* getNext() {return next;}
+  inline monoChain* getPrev() {return prev;}
+  inline directedLine* getHead() {return chainHead;}
+  inline directedLine* getTail() {return chainTail;}
+  
+  inline void resetCurrent() { current = ((isIncrease==1)? chainHead:chainTail);}
+
+  void deleteLoop();
+  void deleteLoopList();
+
+  //insert a new chain between prev and this
+  void insert(monoChain* nc);
+
+  Int numChainsSingleLoop();
+  Int numChainsAllLoops();
+  monoChain** toArrayAllLoops(Int& num_chains);
+  Int toArraySingleLoop(monoChain** array, Int index);
+
+  Int isKey;
+  Real keyY; //the current horizotal line  
+  Real chainIntersectHoriz(Real y); //updates current incrementally for efficiency
+  directedLine* find(Real y);//find dline so that y intersects dline.
+
+  void printOneChain();
+  void printChainLoop();
+  void printAllLoops();
+    
+};
+
+monoChain* directedLineLoopToMonoChainLoop(directedLine* loop);
+monoChain* directedLineLoopListToMonoChainLoopList(directedLine* list);
+Int MC_sweepY(Int nVertices, monoChain** sortedVertices, sweepRange** ret_ranges);
+
+void MC_findDiagonals(Int total_num_edges, monoChain** sortedVertices,
+		   sweepRange** ranges, Int& num_diagonals, 
+		   directedLine** diagonal_vertices);
+
+directedLine* MC_partitionY(directedLine *polygons, sampledLine **retSampledLines);
+
+#endif