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/**************************************************************************
*
* Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
/**
* \file
* Buffer management.
*
* A buffer manager does only one basic thing: it creates buffers. Actually,
* "buffer factory" would probably a more accurate description.
*
* You can chain buffer managers so that you can have a finer grained memory
* management and pooling.
*
* For example, for a simple batch buffer manager you would chain:
* - the native buffer manager, which provides DMA memory from the graphics
* memory space;
* - the pool buffer manager, which keep around a pool of equally sized buffers
* to avoid latency associated with the native buffer manager;
* - the fenced buffer manager, which will delay buffer destruction until the
* the moment the card finishing processing it.
*
* \author José Fonseca <jrfonseca@tungstengraphics.com>
*/
#ifndef PB_BUFMGR_H_
#define PB_BUFMGR_H_
#include <stddef.h>
#ifdef __cplusplus
extern "C" {
#endif
struct pb_desc;
struct pipe_buffer;
struct pipe_winsys;
/**
* Abstract base class for all buffer managers.
*/
struct pb_manager
{
/* XXX: we will likely need more allocation flags */
struct pb_buffer *
(*create_buffer)( struct pb_manager *mgr,
size_t size,
const struct pb_desc *desc);
void
(*destroy)( struct pb_manager *mgr );
};
/**
* Static buffer pool sub-allocator.
*
* Manages the allocation of equally sized buffers. It does so by allocating
* a single big buffer and divide it equally sized buffers.
*
* It is meant to manage the allocation of batch buffer pools.
*/
struct pb_manager *
pool_bufmgr_create(struct pb_manager *provider,
size_t n, size_t size,
const struct pb_desc *desc);
/**
* Static sub-allocator based the old memory manager.
*
* It managers buffers of different sizes. It does so by allocating a buffer
* with the size of the heap, and then using the old mm memory manager to manage
* that heap.
*/
struct pb_manager *
mm_bufmgr_create(struct pb_manager *provider,
size_t size, size_t align2);
/**
* Same as mm_bufmgr_create.
*
* Buffer will be release when the manager is destroyed.
*/
struct pb_manager *
mm_bufmgr_create_from_buffer(struct pb_buffer *buffer,
size_t size, size_t align2);
/**
* Slab sub-allocator.
*/
struct pb_manager *
pb_slab_manager_create(struct pb_manager *provider,
size_t bufSize,
size_t slabSize,
const struct pb_desc *desc);
/**
* Allow a range of buffer size, by aggregating multiple slabs sub-allocators
* with different bucket sizes.
*/
struct pb_manager *
pb_slab_range_manager_create(struct pb_manager *provider,
size_t minBufSize,
size_t maxBufSize,
size_t slabSize,
const struct pb_desc *desc);
/**
* Time-based buffer cache.
*
* This manager keeps a cache of destroyed buffers during a time interval.
*/
struct pb_manager *
pb_cache_manager_create(struct pb_manager *provider,
unsigned usecs);
/**
* Fenced buffer manager.
*
* This manager is just meant for convenience. It wraps the buffers returned
* by another manager in fenced buffers, so that
*
* NOTE: the buffer manager that provides the buffers will be destroyed
* at the same time.
*/
struct pb_manager *
fenced_bufmgr_create(struct pb_manager *provider,
struct pipe_winsys *winsys);
#ifdef __cplusplus
}
#endif
#endif /*PB_BUFMGR_H_*/
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