dll/opengl/glu32/src/libnurbs/nurbtess/primitiveStream.cc

   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 #include "gluos.h"
  39 #include <stdlib.h>
  40 #include <stdio.h>
  41 #include <assert.h>
  42 #include <GL/gl.h>
  43
  44 #include "primitiveStream.h"
  45
  46 Int primStream::num_triangles()
  47 {
  48   Int i;
  49   Int ret=0;
  50   for(i=0; i<index_lengths; i++)
  51     {
  52       ret += lengths[i]-2;
  53     }
  54   return ret;
  55 }
  56
  57
  58
  59 /*the begining of inserting a new primitive.
  60  *reset counter to be 0.
  61  */
  62 void primStream::begin()
  63 {
  64   counter = 0;
  65 }
  66
  67 void primStream::insert(Real u, Real v)
  68 {
  69   /*if the space cannot hold u and v,
  70    *we have to expand the array
  71    */
  72   if(index_vertices+1 >= size_vertices) {
  73     Real* temp = (Real*) malloc (sizeof(Real) * (2*size_vertices + 2));
  74     assert(temp);
  75
  76     /*copy*/
  77     for(Int i=0; i<index_vertices; i++)
  78       temp[i] = vertices[i];
  79
  80     free(vertices);
  81     vertices = temp;
  82     size_vertices = 2*size_vertices + 2;
  83   }
  84
  85   vertices[index_vertices++] = u;
  86   vertices[index_vertices++] = v;
  87   counter++;
  88 }
  89
  90 /*the end of a primitive.
  91  *increase index_lengths
  92  */
  93 void primStream::end(Int type)
  94 {
  95   Int i;
  96   /*if there is no vertex in this primitive,
  97    *nothing needs to be done
  98    */
  99   if(counter == 0) return ;
 100
 101   if(index_lengths >= size_lengths){
 102     Int* temp = (Int*) malloc(sizeof(Int) * (2*size_lengths + 2));
 103     assert(temp);
 104     Int* tempTypes = (Int*) malloc(sizeof(Int) * (2*size_lengths + 2));
 105     assert(tempTypes);
 106
 107     /*copy*/
 108     for(i=0; i<index_lengths; i++){
 109       temp[i] = lengths[i];
 110       tempTypes[i] = types[i];
 111     }
 112
 113     free(lengths);
 114     free(types);
 115     lengths = temp;
 116     types = tempTypes;
 117     size_lengths = 2*size_lengths + 2;
 118   }
 119   lengths[index_lengths] = counter;
 120   types[index_lengths] = type;
 121   index_lengths++;
 122 }
 123
 124 void primStream::print()
 125 {
 126   Int i,j,k;
 127   printf("index_lengths=%i,size_lengths=%i\n", index_lengths, size_lengths);
 128   printf("index_vertices=%i,size_vertices=%i\n", index_vertices, size_vertices);
 129   k=0;
 130   for(i=0; i<index_lengths; i++)
 131     {
 132       if(types[i] == PRIMITIVE_STREAM_FAN)
 133         printf("primitive-FAN:\n");
 134       else
 135         printf("primitive-STRIP:\n");
 136       for(j=0; j<lengths[i]; j++)
 137         {
 138           printf("(%f,%f) ", vertices[k], vertices[k+1]);
 139           k += 2;
 140         }
 141       printf("\n");
 142     }
 143 }
 144
 145 primStream::primStream(Int sizeLengths, Int sizeVertices)
 146 {
 147   lengths = (Int*)malloc (sizeof(Int) * sizeLengths);
 148   assert(lengths);
 149   types = (Int*)malloc (sizeof(Int) * sizeLengths);
 150   assert(types);
 151
 152   vertices = (Real*) malloc(sizeof(Real) * sizeVertices);
 153   assert(vertices);
 154
 155   index_lengths = 0;
 156   index_vertices = 0;
 157   size_lengths = sizeLengths;
 158   size_vertices = sizeVertices;
 159
 160   counter = 0;
 161 }
 162
 163 primStream::~primStream()
 164 {
 165   free(lengths);
 166   free(types);
 167   free(vertices);
 168 }
 169
 170 void primStream::draw()
 171 {
 172   Int i,j,k;
 173   k=0;
 174   for(i=0; i<index_lengths; i++)
 175     {
 176       switch(types[i]){
 177       case PRIMITIVE_STREAM_FAN:
 178         glBegin(GL_TRIANGLE_FAN);
 179         break;
 180       case PRIMITIVE_STREAM_STRIP:
 181         glBegin(GL_TRIANGLE_STRIP);
 182         break;
 183       }
 184
 185       for(j=0; j<lengths[i]; j++){
 186         glVertex2fv(vertices+k);
 187         k += 2;
 188       }
 189       glEnd();
 190     }
 191 }
 192