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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
* Generic code for buffers.
*
* Behind a pipe buffle handle there can be DMA buffers, client (or user)
* buffers, regular malloced buffers, etc. This file provides an abstract base
* buffer handle that allows the driver to cope with all those kinds of buffers
* in a more flexible way.
*
* There is no obligation of a winsys driver to use this library. And a pipe
* driver should be completly agnostic about it.
*
* \author Jos� Fonseca <jrfonseca@tungstengraphics.com>
*/
#ifndef PB_BUFFER_H_
#define PB_BUFFER_H_
#include <assert.h>
#include <stdlib.h>
#include "pipe/p_compiler.h"
#include "pipe/p_state.h"
#include "pipe/p_inlines.h"
struct pb_vtbl;
/**
* Buffer description.
*
* Used when allocating the buffer.
*/
struct pb_desc
{
unsigned alignment;
unsigned usage;
};
/**
* Base class for all pb_* buffers.
*/
struct pb_buffer
{
struct pipe_buffer base;
/**
* Pointer to the virtual function table.
*
* Avoid accessing this table directly. Use the inline functions below
* instead to avoid mistakes.
*/
const struct pb_vtbl *vtbl;
};
/**
* Virtual function table for the buffer storage operations.
*
* Note that creation is not done through this table.
*/
struct pb_vtbl
{
void (*destroy)( struct pb_buffer *buf );
/**
* Map the entire data store of a buffer object into the client's address.
* flags is bitmask of PIPE_BUFFER_FLAG_READ/WRITE.
*/
void *(*map)( struct pb_buffer *buf,
unsigned flags );
void (*unmap)( struct pb_buffer *buf );
/**
* Get the base buffer and the offset.
*
* A buffer can be subdivided in smaller buffers. This method should return
* the underlaying buffer, and the relative offset.
*
* Buffers without an underlaying base buffer should return themselves, with
* a zero offset.
*
* Note that this will increase the reference count of the base buffer.
*/
void (*get_base_buffer)( struct pb_buffer *buf,
struct pb_buffer **base_buf,
unsigned *offset );
};
static INLINE struct pipe_buffer *
pb_pipe_buffer( struct pb_buffer *pbuf )
{
assert(pbuf);
return &pbuf->base;
}
static INLINE struct pb_buffer *
pb_buffer( struct pipe_buffer *buf )
{
assert(buf);
/* Could add a magic cookie check on debug builds.
*/
return (struct pb_buffer *)buf;
}
/* Accessor functions for pb->vtbl:
*/
static INLINE void *
pb_map(struct pb_buffer *buf,
unsigned flags)
{
assert(buf);
return buf->vtbl->map(buf, flags);
}
static INLINE void
pb_unmap(struct pb_buffer *buf)
{
assert(buf);
buf->vtbl->unmap(buf);
}
static INLINE void
pb_get_base_buffer( struct pb_buffer *buf,
struct pb_buffer **base_buf,
unsigned *offset )
{
buf->vtbl->get_base_buffer(buf, base_buf, offset);
}
static INLINE void
pb_destroy(struct pb_buffer *buf)
{
assert(buf);
buf->vtbl->destroy(buf);
}
/* XXX: thread safety issues!
*/
static INLINE void
pb_reference(struct pb_buffer **dst,
struct pb_buffer *src)
{
if (src)
src->base.refcount++;
if (*dst && --(*dst)->base.refcount == 0)
pb_destroy( *dst );
*dst = src;
}
/**
* Malloc-based buffer to store data that can't be used by the graphics
* hardware.
*/
struct pb_buffer *
pb_malloc_buffer_create(size_t size,
const struct pb_desc *desc);
void
pb_init_winsys(struct pipe_winsys *winsys);
#endif /*PB_BUFFER_H_*/
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