1/*
2 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
3 * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice including the dates of first publication and
13 * either this permission notice or a reference to
14 * http://oss.sgi.com/projects/FreeB/
15 * shall be included in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
21 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
22 * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24 *
25 * Except as contained in this notice, the name of Silicon Graphics, Inc.
26 * shall not be used in advertising or otherwise to promote the sale, use or
27 * other dealings in this Software without prior written authorization from
28 * Silicon Graphics, Inc.
29 */
30/*
31*/
32
33/*we do not use the constans GL_... so that this file is independent of
34 *<GL/gl.h>
35 */
36
37#ifndef _PRIMITIVE_STREAM_H
38#define _PRIMITIVE_STREAM_H
39
40enum {PRIMITIVE_STREAM_FAN, PRIMITIVE_STREAM_STRIP};
41
42#include "definitions.h"
43
44class primStream {
45  Int *lengths; /*length[i]=number of vertices of ith primitive*/
46  Int *types; /*each primive has a type: FAN or STREAM*/
47  Real *vertices; /*the size >= 2 * num_vertices, each vertex (u,v)*/
48
49  /*the following size information are used for dynamic arrays*/
50  Int index_lengths; /*the current available entry*/
51  Int size_lengths; /*the allocated size of the array: lengths*/
52  Int index_vertices;
53  Int size_vertices;
54
55  /*the vertex is inserted one by one. counter is used to
56   *count the number of vertices which have been inserted so far in
57   *the current primitive
58   */
59  Int counter;
60
61public:
62  primStream(Int sizeLengths, Int sizeVertices);
63  ~primStream();
64
65  Int get_n_prims() //num of primitives
66    {
67      return index_lengths;
68    }
69  Int get_type(Int i)  //the type of ith primitive
70    {
71      return  types[i];
72    }
73  Int get_length(Int i) //the length of the ith primitive
74    {
75      return lengths[i];
76    }
77  Real* get_vertices() {return vertices;}
78
79  /*the begining of inserting a new primitive.
80   *reset counter to be 0.
81   */
82  void begin();
83  void insert(Real u, Real v);
84  void insert(Real v[2]) {insert(v[0], v[1]);}
85  void end(Int type);
86
87  Int num_triangles();
88
89  void triangle(Real A[2], Real B[2], Real C[2])
90    {
91      begin();
92      insert(A);
93      insert(B);
94      insert(C);
95      end(PRIMITIVE_STREAM_FAN);
96    }
97  void print();
98  void draw(); /*using GL to draw the primitives*/
99};
100
101
102
103
104
105
106
107
108#endif
109
110