src/glu/sgi/libnurbs/nurbtess/monoTriangulation.h

   1 /*
   2 ** License Applicability. Except to the extent portions of this file are
   3 ** made subject to an alternative license as permitted in the SGI Free
   4 ** Software License B, Version 1.1 (the "License"), the contents of this
   5 ** file are subject only to the provisions of the License. You may not use
   6 ** this file except in compliance with the License. You may obtain a copy
   7 ** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
   8 ** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
   9 **
  10 ** http://oss.sgi.com/projects/FreeB
  11 **
  12 ** Note that, as provided in the License, the Software is distributed on an
  13 ** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
  14 ** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
  15 ** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
  16 ** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
  17 **
  18 ** Original Code. The Original Code is: OpenGL Sample Implementation,
  19 ** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
  20 ** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
  21 ** Copyright in any portions created by third parties is as indicated
  22 ** elsewhere herein. All Rights Reserved.
  23 **
  24 ** Additional Notice Provisions: The application programming interfaces
  25 ** established by SGI in conjunction with the Original Code are The
  26 ** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
  27 ** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
  28 ** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
  29 ** Window System(R) (Version 1.3), released October 19, 1998. This software
  30 ** was created using the OpenGL(R) version 1.2.1 Sample Implementation
  31 ** published by SGI, but has not been independently verified as being
  32 ** compliant with the OpenGL(R) version 1.2.1 Specification.
  33 **
  34 */
  35 /*
  36 */
  37
  38 #ifndef _MONO_TRIANGULATION_H
  39 #define _MONO_TRIANGULATION_H
  40
  41 #include "definitions.h"
  42 #include "primitiveStream.h"
  43 #include "directedLine.h"
  44 #include "arc.h"
  45
  46 class Backend;
  47
  48 class reflexChain{
  49   Real2 *queue;
  50   /*the order of the polygon vertices: either q[0],q[1].., or
  51    * q[n-1], q[n-2], ..., q[0]
  52    *this order determines the interior of the polygon, so it
  53    *also used to determines whether a chain is reflex or convex
  54    */
  55   Int isIncreasing;
  56   Int index_queue;
  57   Int size_queue; /*allocated size*/
  58
  59 public:
  60   reflexChain(Int size, Int isIncreasing);
  61   ~reflexChain();
  62
  63   void insert(Real u, Real v);
  64   void insert(Real v[2]);
  65
  66   void processNewVertex(Real v[2], primStream* pStream);
  67   void outputFan(Real v[2], primStream* pStream);
  68
  69   void processNewVertex(Real v[2], Backend* backend);
  70   void outputFan(Real v[2], Backend* backend);
  71
  72   void print();
  73 };
  74
  75 /*dynamic array of pointers to reals.
  76  *Intended to store an array of (u,v).
  77  *Notice that it doesn't allocate or dealocate the space
  78  *for the (u,v) themselfs. So it assums that someone else
  79  *is taking care of them, while this class only plays with
  80  *the pointers.
  81  */
  82 class vertexArray{
  83   Real** array;
  84   Int index;
  85   Int size;
  86 public:
  87   vertexArray(Int s);
  88   vertexArray(Real vertices[][2], Int nVertices);
  89   ~vertexArray();
  90   void appendVertex(Real* ptr); /*the content (pointed by ptr is NOT copied*/
  91   Real* getVertex(Int i) {return array[i];}
  92   Real** getArray() {return array;}
  93   Int getNumElements() {return index;}
  94   Int findIndexAbove(Real v);
  95   Int findIndexAboveGen(Real v, Int startIndex, Int EndIndex);
  96   Int findIndexBelowGen(Real v, Int startIndex, Int EndIndex);
  97   Int findIndexStrictBelowGen(Real v, Int startIndex, Int EndIndex);
  98   Int findIndexFirstAboveEqualGen(Real v, Int startIndex, Int endIndex);
  99   Int skipEqualityFromStart(Real v, Int start, Int end);
 100   //return i such that fron [i+1, end] is strictly U-monotone (left to right
 101   Int findDecreaseChainFromEnd(Int begin, Int end);
 102   void print();
 103 };
 104
 105 void monoTriangulation(directedLine* monoPolygon, primStream* pStream);
 106
 107 void monoTriangulationRec(Real* topVertex, Real* botVertex,
 108                           vertexArray* inc_chain, Int inc_current,
 109                           vertexArray* dec_chain, Int dec_current,
 110                           primStream* pStream);
 111
 112 void monoTriangulationRec(directedLine* inc_chain, Int inc_index,
 113                           directedLine* dec_chain, Int dec_index,
 114                           directedLine* topVertex, Int top_index,
 115                           directedLine* botVertex,
 116                           primStream* pStream);
 117
 118 /*the chain could be increasing or decreasing, although we use the
 119  * name inc_chain.
 120  *the argument  is_increase_chain indicates whether this chain
 121  *is increasing (left chain in V-monotone case) or decreaing (right chain
 122  *in V-monotone case).
 123  */
 124 void monoTriangulation2(Real* topVertex, Real* botVertex,
 125                         vertexArray* inc_chain, Int inc_smallIndex,
 126                         Int inc_largeIndex,
 127                         Int is_increase_chain,
 128                         primStream* pStream);
 129 void monoTriangulationRecGen(Real* topVertex, Real* botVertex,
 130                           vertexArray* inc_chain, Int inc_current, Int inc_end,
 131                           vertexArray* dec_chain, Int dec_current, Int dec_end,
 132                           primStream* pStream);
 133
 134 void monoTriangulationRecGenOpt(Real* topVertex, Real* botVertex,
 135                           vertexArray* inc_chain, Int inc_current, Int inc_end,
 136                           vertexArray* dec_chain, Int dec_current, Int dec_end,
 137                           primStream* pStream);
 138
 139 void triangulateXYMonoTB(Int n_left, Real** leftVerts,
 140                        Int n_right, Real** rightVerts,
 141                        primStream* pStream);
 142
 143 void monoTriangulationRecGenTBOpt(Real* topVertex, Real* botVertex,
 144                           vertexArray* inc_chain, Int inc_current, Int inc_end,
 145                           vertexArray* dec_chain, Int dec_current, Int dec_end,
 146                           primStream* pStream);
 147
 148 void monoTriangulationRecOpt(Real* topVertex, Real* botVertex,
 149                              vertexArray* left_chain, Int left_current,
 150                              vertexArray* right_chain, Int right_current,
 151                              primStream* pStream);
 152
 153 void monoTriangulationRecFunGen(Real* topVertex, Real* botVertex,
 154                           vertexArray* inc_chain, Int inc_current, Int inc_end,
 155                           vertexArray* dec_chain, Int dec_current, Int dec_end,
 156                           Int  (*compFun)(Real*, Real*),
 157                           primStream* pStream);
 158
 159 void monoTriangulationRecFun(Real* topVertex, Real* botVertex,
 160                           vertexArray* inc_chain, Int inc_current,
 161                           vertexArray* dec_chain, Int dec_current,
 162                            Int (*compFun)(Real*, Real*),
 163                           primStream* pStream);
 164 void monoTriangulationFun(directedLine* monoPolygon,
 165                           Int (*compFun)(Real*, Real*), primStream* pStream);
 166
 167
 168
 169
 170 void monoTriangulationRec(Real* topVertex, Real* botVertex,
 171                           vertexArray* inc_chain, Int inc_current,
 172                           vertexArray* dec_chain, Int dec_current,
 173                           Backend* backend);
 174
 175 void monoTriangulationFunBackend(Arc_ptr loop, Int (*compFun)(Real*, Real*), Backend* backend);
 176
 177 void monoTriangulationRecFunBackend(Real* topVertex, Real* botVertex,
 178                           vertexArray* inc_chain, Int inc_current,
 179                           vertexArray* dec_chain, Int dec_current,
 180                           Int  (*compFun)(Real*, Real*),
 181                           Backend* backend);
 182
 183 void monoTriangulationOpt(directedLine* poly, primStream* pStream);
 184
 185 #endif
 186
 187
 188
 189