src/glu/sgi/libnurbs/internals/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  */
  49 Pool::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     for (int i = 0; i < NBLOCKS; i++) {
  64         blocklist[i] = 0;
  65     }
  66 }
  67
  68 /*-----------------------------------------------------------------------------
  69  * ~Pool - free a pool of buffers and the pool itself
  70  *-----------------------------------------------------------------------------
  71  */
  72
  73 Pool::~Pool( void )
  74 {
  75     assert( (this != 0) && (magic == is_allocated) );
  76
  77     while( nextblock ) {
  78         delete [] blocklist[--nextblock];
  79         blocklist[nextblock] = 0;
  80     }
  81     magic = is_free;
  82 }
  83
  84
  85 void Pool::grow( void )
  86 {
  87     assert( (this != 0) && (magic == is_allocated) );
  88     curblock = new char[nextsize];
  89     blocklist[nextblock++] = curblock;
  90     nextfree = nextsize;
  91     nextsize *= 2;
  92 }
  93
  94 /*-----------------------------------------------------------------------------
  95  * Pool::clear - free buffers associated with pool but keep pool
  96  *-----------------------------------------------------------------------------
  97  */
  98
  99 void
 100 Pool::clear( void )
 101 {
 102     assert( (this != 0) && (magic == is_allocated) );
 103
 104     while( nextblock ) {
 105         delete [] blocklist[--nextblock];
 106         blocklist[nextblock] = 0;
 107     }
 108     curblock    = 0;
 109     freelist    = 0;
 110     nextfree    = 0;
 111     if( nextsize > initsize )
 112         nextsize /= 2;
 113 }