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79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
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/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2012 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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*
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*
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* CoglMagazine provides a really light weight allocator for chunks
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* of memory with a pre-determined size.
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*
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* This allocator builds on CoglMemoryStack for making all initial
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* allocations but never frees memory back to the stack.
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*
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* Memory chunks that haven't been allocated yet are stored in a
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* singly linked, fifo, list.
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*
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* Allocating from a magazine is simply a question of popping an entry
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* from the head of the fifo list. If no entries are available then
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* instead allocate from the memory stack instead.
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*
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* When an entry is freed, it is put back into the fifo list for
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* re-use.
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*
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* No attempt is ever made to shrink the amount of memory associated
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* with a CoglMagazine.
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*
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*
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* Authors:
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* Robert Bragg <robert@linux.intel.com>
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "cogl-memory-stack-private.h"
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#include "cogl-magazine-private.h"
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#include <glib.h>
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#define ROUND_UP_8(X) ((X + (8 - 1)) & ~(8 - 1))
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CoglMagazine *
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_cogl_magazine_new (size_t chunk_size, int initial_chunk_count)
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{
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CoglMagazine *magazine = g_new0 (CoglMagazine, 1);
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chunk_size = MAX (chunk_size, sizeof (CoglMagazineChunk));
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chunk_size = ROUND_UP_8 (chunk_size);
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magazine->chunk_size = chunk_size;
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magazine->stack = _cogl_memory_stack_new (chunk_size * initial_chunk_count);
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magazine->head = NULL;
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return magazine;
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}
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void
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_cogl_magazine_free (CoglMagazine *magazine)
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{
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_cogl_memory_stack_free (magazine->stack);
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g_free (magazine);
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}
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