reactos/dll/win32/glu32/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  * $Date$ $Revision: 1.1 $
  39  * $Header: /cygdrive/c/RCVS/CVS/ReactOS/reactos/lib/glu32/libnurbs/internals/bufpool.cc,v 1.1 2004/02/02 16:39:11 navaraf Exp $
  40  */
  41
  42 #include "glimports.h"
  43 #include "myassert.h"
  44 #include "bufpool.h"
  45
  46
  47 /*-----------------------------------------------------------------------------
  48  * Pool - allocate a new pool of buffers
  49  *-----------------------------------------------------------------------------
  50  */
  51 Pool::Pool( int _buffersize, int initpoolsize, char *n )
  52 {
  53     buffersize= (_buffersize < (int)sizeof(Buffer)) ? sizeof(Buffer) : _buffersize;
  54     initsize    = initpoolsize * buffersize;
  55     nextsize    = initsize;
  56     name        = n;
  57     magic       = is_allocated;
  58     nextblock   = 0;
  59     curblock    = 0;
  60     freelist    = 0;
  61     nextfree    = 0;
  62 }
  63
  64 /*-----------------------------------------------------------------------------
  65  * ~Pool - free a pool of buffers and the pool itself
  66  *-----------------------------------------------------------------------------
  67  */
  68
  69 Pool::~Pool( void )
  70 {
  71     assert( (this != 0) && (magic == is_allocated) );
  72
  73     while( nextblock ) {
  74         delete [] blocklist[--nextblock];
  75         blocklist[nextblock] = 0;
  76     }
  77     magic = is_free;
  78 }
  79
  80
  81 void Pool::grow( void )
  82 {
  83     assert( (this != 0) && (magic == is_allocated) );
  84     curblock = new char[nextsize];
  85     blocklist[nextblock++] = curblock;
  86     nextfree = nextsize;
  87     nextsize *= 2;
  88 }
  89
  90 /*-----------------------------------------------------------------------------
  91  * Pool::clear - free buffers associated with pool but keep pool
  92  *-----------------------------------------------------------------------------
  93  */
  94
  95 void
  96 Pool::clear( void )
  97 {
  98     assert( (this != 0) && (magic == is_allocated) );
  99
 100     while( nextblock ) {
 101         delete [] blocklist[--nextblock];
 102         blocklist[nextblock] = 0;
 103     }
 104     curblock    = 0;
 105     freelist    = 0;
 106     nextfree    = 0;
 107     if( nextsize > initsize )
 108         nextsize /= 2;
 109 }