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 ** $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
  35 */
  36 /*
  37 ** $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 $
  38 */
  39
  40 #ifndef _MONO_TRIANGULATION_H
  41 #define _MONO_TRIANGULATION_H
  42
  43 #include "definitions.h"
  44 #include "primitiveStream.h"
  45 #include "directedLine.h"
  46 #include "arc.h"
  47
  48 class Backend;
  49
  50 class reflexChain{
  51   Real2 *queue;
  52   /*the order of the polygon vertices: either q[0],q[1].., or
  53    * q[n-1], q[n-2], ..., q[0]
  54    *this order determines the interior of the polygon, so it
  55    *also used to determines whether a chain is reflex or convex
  56    */
  57   Int isIncreasing;
  58   Int index_queue;
  59   Int size_queue; /*allocated size*/
  60
  61 public:
  62   reflexChain(Int size, Int isIncreasing);
  63   ~reflexChain();
  64
  65   void insert(Real u, Real v);
  66   void insert(Real v[2]);
  67
  68   void processNewVertex(Real v[2], primStream* pStream);
  69   void outputFan(Real v[2], primStream* pStream);
  70
  71   void processNewVertex(Real v[2], Backend* backend);
  72   void outputFan(Real v[2], Backend* backend);
  73
  74   void print();
  75 };
  76
  77 /*dynamic array of pointers to reals.
  78  *Intended to store an array of (u,v).
  79  *Notice that it doesn't allocate or dealocate the space
  80  *for the (u,v) themselfs. So it assums that someone else
  81  *is taking care of them, while this class only plays with
  82  *the pointers.
  83  */
  84 class vertexArray{
  85   Real** array;
  86   Int index;
  87   Int size;
  88 public:
  89   vertexArray(Int s);
  90   vertexArray(Real vertices[][2], Int nVertices);
  91   ~vertexArray();
  92   void appendVertex(Real* ptr); /*the content (pointed by ptr is NOT copied*/
  93   Real* getVertex(Int i) {return array[i];}
  94   Real** getArray() {return array;}
  95   Int getNumElements() {return index;}
  96   Int findIndexAbove(Real v);
  97   Int findIndexAboveGen(Real v, Int startIndex, Int EndIndex);
  98   Int findIndexBelowGen(Real v, Int startIndex, Int EndIndex);
  99   Int findIndexStrictBelowGen(Real v, Int startIndex, Int EndIndex);
 100   Int findIndexFirstAboveEqualGen(Real v, Int startIndex, Int endIndex);
 101   Int skipEqualityFromStart(Real v, Int start, Int end);
 102   //return i such that fron [i+1, end] is strictly U-monotone (left to right
 103   Int findDecreaseChainFromEnd(Int begin, Int end);
 104   void print();
 105 };
 106
 107 void monoTriangulation(directedLine* monoPolygon, primStream* pStream);
 108
 109 void monoTriangulationRec(Real* topVertex, Real* botVertex,
 110                           vertexArray* inc_chain, Int inc_current,
 111                           vertexArray* dec_chain, Int dec_current,
 112                           primStream* pStream);
 113
 114 void monoTriangulationRec(directedLine* inc_chain, Int inc_index,
 115                           directedLine* dec_chain, Int dec_index,
 116                           directedLine* topVertex, Int top_index,
 117                           directedLine* botVertex,
 118                           primStream* pStream);
 119
 120 /*the chain could be increasing or decreasing, although we use the
 121  * name inc_chain.
 122  *the argument  is_increase_chain indicates whether this chain
 123  *is increasing (left chain in V-monotone case) or decreaing (right chain
 124  *in V-monotone case).
 125  */
 126 void monoTriangulation2(Real* topVertex, Real* botVertex,
 127                         vertexArray* inc_chain, Int inc_smallIndex,
 128                         Int inc_largeIndex,
 129                         Int is_increase_chain,
 130                         primStream* pStream);
 131 void monoTriangulationRecGen(Real* topVertex, Real* botVertex,
 132                           vertexArray* inc_chain, Int inc_current, Int inc_end,
 133                           vertexArray* dec_chain, Int dec_current, Int dec_end,
 134                           primStream* pStream);
 135
 136 void monoTriangulationRecGenOpt(Real* topVertex, Real* botVertex,
 137                           vertexArray* inc_chain, Int inc_current, Int inc_end,
 138                           vertexArray* dec_chain, Int dec_current, Int dec_end,
 139                           primStream* pStream);
 140
 141 void triangulateXYMonoTB(Int n_left, Real** leftVerts,
 142                        Int n_right, Real** rightVerts,
 143                        primStream* pStream);
 144
 145 void monoTriangulationRecGenTBOpt(Real* topVertex, Real* botVertex,
 146                           vertexArray* inc_chain, Int inc_current, Int inc_end,
 147                           vertexArray* dec_chain, Int dec_current, Int dec_end,
 148                           primStream* pStream);
 149
 150 void monoTriangulationRecOpt(Real* topVertex, Real* botVertex,
 151                              vertexArray* left_chain, Int left_current,
 152                              vertexArray* right_chain, Int right_current,
 153                              primStream* pStream);
 154
 155 void monoTriangulationRecFunGen(Real* topVertex, Real* botVertex,
 156                           vertexArray* inc_chain, Int inc_current, Int inc_end,
 157                           vertexArray* dec_chain, Int dec_current, Int dec_end,
 158                           Int  (*compFun)(Real*, Real*),
 159                           primStream* pStream);
 160
 161 void monoTriangulationRecFun(Real* topVertex, Real* botVertex,
 162                           vertexArray* inc_chain, Int inc_current,
 163                           vertexArray* dec_chain, Int dec_current,
 164                            Int (*compFun)(Real*, Real*),
 165                           primStream* pStream);
 166 void monoTriangulationFun(directedLine* monoPolygon,
 167                           Int (*compFun)(Real*, Real*), primStream* pStream);
 168
 169
 170
 171
 172 void monoTriangulationRec(Real* topVertex, Real* botVertex,
 173                           vertexArray* inc_chain, Int inc_current,
 174                           vertexArray* dec_chain, Int dec_current,
 175                           Backend* backend);
 176
 177 void monoTriangulationFunBackend(Arc_ptr loop, Int (*compFun)(Real*, Real*), Backend* backend);
 178
 179 void monoTriangulationRecFunBackend(Real* topVertex, Real* botVertex,
 180                           vertexArray* inc_chain, Int inc_current,
 181                           vertexArray* dec_chain, Int dec_current,
 182                           Int  (*compFun)(Real*, Real*),
 183                           Backend* backend);
 184
 185 void monoTriangulationOpt(directedLine* poly, primStream* pStream);
 186
 187 #endif
 188
 189
 190
 191