pelya
143 lines
4.3 KiB
C++
143 lines
4.3 KiB
C++
/*
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* SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
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* Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice including the dates of first publication and
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* either this permission notice or a reference to
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* http://oss.sgi.com/projects/FreeB/
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* shall be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
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* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Except as contained in this notice, the name of Silicon Graphics, Inc.
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* shall not be used in advertising or otherwise to promote the sale, use or
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* other dealings in this Software without prior written authorization from
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* Silicon Graphics, Inc.
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*/
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/*
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*
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* OpenGL ES 1.0 CM port of GLU by Mike Gorchak <mike@malva.ua>
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*/
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#ifndef __glubufpool_h_
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#define __glubufpool_h_
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#include "myassert.h"
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#include "mystdlib.h"
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#define NBLOCKS 32
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class Buffer
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{
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friend class Pool;
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Buffer* next; /* next buffer on free list */
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};
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class Pool
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{
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public:
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Pool(int, int, const char*);
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~Pool(void);
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inline void* new_buffer(void);
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inline void free_buffer(void*);
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void clear(void);
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private:
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void grow(void);
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protected:
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Buffer* freelist; /* linked list of free buffers */
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char* blocklist[NBLOCKS]; /* blocks of malloced memory */
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int nextblock; /* next free block index */
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char* curblock; /* last malloced block */
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int buffersize; /* bytes per buffer */
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int nextsize; /* size of next block of memory */
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int nextfree; /* byte offset past next free buffer */
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int initsize;
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enum Magic {is_allocated=0xf3a1, is_free=0xf1a2};
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const char* name; /* name of the pool */
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Magic magic; /* marker for valid pool */
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};
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/*-----------------------------------------------------------------------------
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* Pool::free_buffer - return a buffer to a pool
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*-----------------------------------------------------------------------------
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*/
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inline void Pool::free_buffer(void* b)
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{
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assert((this!=0) && (magic==is_allocated));
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/* add buffer to singly connected free list */
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((Buffer*)b)->next=freelist;
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freelist=(Buffer*)b;
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}
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/*-----------------------------------------------------------------------------
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* Pool::new_buffer - allocate a buffer from a pool
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*-----------------------------------------------------------------------------
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*/
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inline void* Pool::new_buffer(void)
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{
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void* buffer;
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assert((this!=0) && (magic==is_allocated));
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/* find free buffer */
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if (freelist)
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{
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buffer=(void*)freelist;
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freelist=freelist->next;
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}
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else
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{
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if (!nextfree)
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{
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grow();
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}
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nextfree-=buffersize;;
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buffer=(void*)(curblock+nextfree);
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}
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return buffer;
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}
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class PooledObj
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{
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public:
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inline void* operator new(size_t, Pool&);
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inline void* operator new(size_t, void*);
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inline void* operator new(size_t s) {return ::new char[s];}
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inline void operator delete(void*) {assert(0);}
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inline void operator delete(void*, Pool&) {assert(0);}
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inline void deleteMe(Pool&);
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};
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inline void* PooledObj::operator new(size_t, Pool& pool)
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{
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return pool.new_buffer();
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}
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inline void PooledObj::deleteMe(Pool& pool)
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{
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pool.free_buffer((void*) this);
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}
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#endif /* __glubufpool_h_ */
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