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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 fencing.
*
* "Fenced buffers" is actually a misnomer. They should be referred as
* "fenceable buffers", i.e, buffers that can be fenced, but I couldn't find
* the word "fenceable" in the dictionary.
*
* A "fenced buffer" is a decorator around a normal buffer, which adds two
* special properties:
* - the ability for the destruction to be delayed by a fence;
* - reference counting.
*
* Usually DMA buffers have a life-time that will extend the life-time of its
* handle. The end-of-life is dictated by the fence signalling.
*
* Between the handle's destruction, and the fence signalling, the buffer is
* stored in a fenced buffer list.
*
* \author Jose Fonseca <jrfonseca@tungstengraphics.com>
*/
#ifndef PB_BUFFER_FENCED_H_
#define PB_BUFFER_FENCED_H_
#include "util/u_debug.h"
#ifdef __cplusplus
extern "C" {
#endif
struct pipe_buffer;
struct pipe_fence_handle;
/**
* List of buffers which are awaiting fence signalling.
*/
struct fenced_buffer_list;
struct pb_fence_ops
{
void (*destroy)( struct pb_fence_ops *ops );
/** Set ptr = fence, with reference counting */
void (*fence_reference)( struct pb_fence_ops *ops,
struct pipe_fence_handle **ptr,
struct pipe_fence_handle *fence );
/**
* Checks whether the fence has been signalled.
* \param flags driver-specific meaning
* \return zero on success.
*/
int (*fence_signalled)( struct pb_fence_ops *ops,
struct pipe_fence_handle *fence,
unsigned flag );
/**
* Wait for the fence to finish.
* \param flags driver-specific meaning
* \return zero on success.
*/
int (*fence_finish)( struct pb_fence_ops *ops,
struct pipe_fence_handle *fence,
unsigned flag );
};
/**
* Create a fenced buffer list.
*
* See also fenced_bufmgr_create for a more convenient way to use this.
*/
struct fenced_buffer_list *
fenced_buffer_list_create(struct pb_fence_ops *ops);
/**
* Walk the fenced buffer list to check and free signalled buffers.
*/
void
fenced_buffer_list_check_free(struct fenced_buffer_list *fenced_list,
int wait);
#ifdef DEBUG
void
fenced_buffer_list_dump(struct fenced_buffer_list *fenced_list);
#endif
void
fenced_buffer_list_destroy(struct fenced_buffer_list *fenced_list);
/**
* Wrap a buffer in a fenced buffer.
*
* NOTE: this will not increase the buffer reference count.
*/
struct pb_buffer *
fenced_buffer_create(struct fenced_buffer_list *fenced,
struct pb_buffer *buffer);
#ifdef __cplusplus
}
#endif
#endif /*PB_BUFFER_FENCED_H_*/
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