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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 handle interface.
*
* \author José Fonseca <jrfonseca@tungstengraphics.com>
*/
#ifndef PB_BUFFER_HANDLE_H_
#define PB_BUFFER_HANDLE_H_
#include <assert.h>
#include "pb_buffer.h"
/**
* Buffer handle.
*
* The buffer handle and the buffer data storage are separate entities. This
* is modelled after ARB_vertex_buffer_object, which is the interface that
* Gallium requires. See p_winsys.h for more information.
*/
struct pipe_buffer_handle
{
/** Reference count */
unsigned refcount;
/** Allocation characteristics */
unsigned alignment;
unsigned flags;
unsigned hint;
/**
* The actual buffer.
*
* It should never be NULL. Use null_buffer instead.
*/
struct pipe_buffer *buf;
};
/**
* Set buffer storage.
*
* NOTE: this will not increase the buffer reference count.
*/
static inline void
buffer_handle_data(struct pipe_buffer_handle *handle,
struct pipe_buffer *buf)
{
assert(handle);
assert(handle->buf);
buffer_release(handle->buf);
assert(buf);
handle->buf = buf;
}
static inline void
buffer_handle_clear(struct pipe_buffer_handle *handle)
{
buffer_handle_data(handle, &null_buffer);
}
static inline int
buffer_handle_has_data(struct pipe_buffer_handle *handle) {
assert(handle);
assert(handle->buf);
return handle->buf != &null_buffer;
}
/**
* Fill in the pipe_winsys' buffer-related callbacks.
*
* Specifically, the fullfilled functions are:
* - buffer_create
* - user_buffer_create
* - buffer_map
* - buffer_unmap
* - buffer_reference
* - buffer_subdata
* - buffer_get_subdata
*
* NOTE: buffer_data is left untouched.
*/
void
buffer_handle_init_winsys(struct pipe_winsys *winsys);
#endif /*PB_BUFFER_HANDLE_H_*/
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