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 
193