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 
40 enum {PRIMITIVE_STREAM_FAN, PRIMITIVE_STREAM_STRIP};
41 
42 #include "definitions.h"
43 
44 class 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 
61 public:
62   primStream(Int sizeLengths, Int sizeVertices);
63   ~primStream();
64 
get_n_prims()65   Int get_n_prims() //num of primitives
66     {
67       return index_lengths;
68     }
get_type(Int i)69   Int get_type(Int i)  //the type of ith primitive
70     {
71       return  types[i];
72     }
get_length(Int i)73   Int get_length(Int i) //the length of the ith primitive
74     {
75       return lengths[i];
76     }
get_vertices()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);
insert(Real v[2])84   void insert(Real v[2]) {insert(v[0], v[1]);}
85   void end(Int type);
86 
87   Int num_triangles();
88 
triangle(Real A[2],Real B[2],Real C[2])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