FreeWRL / FreeX3D 4.3.0
bufpool.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 * bufpool.c++
37 *
38 */
39#ifdef __unix__
40# include "stdlib.h"
41# include "assert.h"
42#endif
43
44#include "glimports.h"
45#include "myassert.h"
46#include "bufpool.h"
47
48
49/*-----------------------------------------------------------------------------
50 * Pool - allocate a new pool of buffers
51 *-----------------------------------------------------------------------------
52 */
53Pool::Pool( int _buffersize, int initpoolsize, const char *n )
54{
55 if((unsigned)_buffersize < sizeof(Buffer))
56 buffersize = sizeof(Buffer);
57 else
58 buffersize = _buffersize;
59 initsize = initpoolsize * buffersize;
60 nextsize = initsize;
61 name = n;
62 magic = is_allocated;
63 nextblock = 0;
64 curblock = 0;
65 freelist = 0;
66 nextfree = 0;
67}
68
69/*-----------------------------------------------------------------------------
70 * ~Pool - free a pool of buffers and the pool itself
71 *-----------------------------------------------------------------------------
72 */
73
74Pool::~Pool( void )
75{
76 assert( (this != 0) && (magic == is_allocated) );
77
78 while( nextblock ) {
79 delete [] blocklist[--nextblock];
80 blocklist[nextblock] = 0;
81 }
82 magic = is_free;
83}
84
85
86void Pool::grow( void )
87{
88 assert( (this != 0) && (magic == is_allocated) );
89 curblock = new char[nextsize];
90 blocklist[nextblock++] = curblock;
91 nextfree = nextsize;
92 nextsize *= 2;
93}
94
95/*-----------------------------------------------------------------------------
96 * Pool::clear - free buffers associated with pool but keep pool
97 *-----------------------------------------------------------------------------
98 */
99
100void
101Pool::clear( void )
102{
103 assert( (this != 0) && (magic == is_allocated) );
104
105 while( nextblock ) {
106 delete [] blocklist[--nextblock];
107 blocklist[nextblock] = 0;
108 }
109 curblock = 0;
110 freelist = 0;
111 nextfree = 0;
112 if( nextsize > initsize )
113 nextsize /= 2;
114}