xref: /xsrc/external/mit/glu/dist/src/libnurbs/internals/bufpool.cc

/*
** License Applicability. Except to the extent portions of this file are
** made subject to an alternative license as permitted in the SGI Free
** Software License B, Version 1.1 (the "License"), the contents of this
** file are subject only to the provisions of the License. You may not use
** this file except in compliance with the License. You may obtain a copy
** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
**
** http://oss.sgi.com/projects/FreeB
**
** Note that, as provided in the License, the Software is distributed on an
** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
**
** Original Code. The Original Code is: OpenGL Sample Implementation,
** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
** Copyright in any portions created by third parties is as indicated
** elsewhere herein. All Rights Reserved.
**
** Additional Notice Provisions: The application programming interfaces
** established by SGI in conjunction with the Original Code are The
** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
** Window System(R) (Version 1.3), released October 19, 1998. This software
** was created using the OpenGL(R) version 1.2.1 Sample Implementation
** published by SGI, but has not been independently verified as being
** compliant with the OpenGL(R) version 1.2.1 Specification.
*/

/*
 *  bufpool.c++
 *
 */

#include "glimports.h"
#include "myassert.h"
#include "bufpool.h"


/*-----------------------------------------------------------------------------
 * Pool - allocate a new pool of buffers
 *-----------------------------------------------------------------------------
 */
Pool::Pool( int _buffersize, int initpoolsize, const char *n )
{
    if((unsigned)_buffersize < sizeof(Buffer))
        buffersize = sizeof(Buffer);
    else
        buffersize = _buffersize;
    initsize	= initpoolsize * buffersize;
    nextsize	= initsize;
    name	= n;
    magic	= is_allocated;
    nextblock	= 0;
    curblock	= 0;
    freelist	= 0;
    nextfree	= 0;
    for (int i = 0; i < NBLOCKS; i++) {
        blocklist[i] = 0;
    }
}

/*-----------------------------------------------------------------------------
 * ~Pool - free a pool of buffers and the pool itself
 *-----------------------------------------------------------------------------
 */

Pool::~Pool( void )
{
    assert( (this != 0) && (magic == is_allocated) );

    while( nextblock ) {
	delete [] blocklist[--nextblock];
        blocklist[nextblock] = 0;
    }
    magic = is_free;
}


void Pool::grow( void )
{
    assert( (this != 0) && (magic == is_allocated) );
    curblock = new char[nextsize];
    blocklist[nextblock++] = curblock;
    nextfree = nextsize;
    nextsize *= 2;
}

/*-----------------------------------------------------------------------------
 * Pool::clear - free buffers associated with pool but keep pool
 *-----------------------------------------------------------------------------
 */

void
Pool::clear( void )
{
    assert( (this != 0) && (magic == is_allocated) );

    while( nextblock ) {
	delete [] blocklist[--nextblock];
	blocklist[nextblock] = 0;
    }
    curblock	= 0;
    freelist	= 0;
    nextfree	= 0;
    if( nextsize > initsize )
        nextsize /= 2;
}