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