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
46Int 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 */
62void primStream::begin()
63{
64  counter = 0;
65}
66
67void 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 */
93void 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
124void 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
145primStream::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
163primStream::~primStream()
164{
165  free(lengths);
166  free(types);
167  free(vertices);
168}
169
170void 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
193