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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
* Implementation of client buffer (also designated as "user buffers"), which
* are just state-tracker owned data masqueraded as buffers.
*
* \author José Fonseca <jrfonseca@tungstengraphics.com>
*/
#include "pipe/p_winsys.h"
#include "pipe/p_util.h"
#include "pb_buffer.h"
/**
* User buffers are special buffers that initially reference memory
* held by the user but which may if necessary copy that memory into
* device memory behind the scenes, for submission to hardware.
*
* These are particularly useful when the referenced data is never
* submitted to hardware at all, in the particular case of software
* vertex processing.
*/
struct pb_user_buffer
{
struct pb_buffer base;
void *data;
};
extern const struct pb_vtbl pb_user_buffer_vtbl;
static INLINE struct pb_user_buffer *
pb_user_buffer(struct pb_buffer *buf)
{
assert(buf);
assert(buf->vtbl == &pb_user_buffer_vtbl);
return (struct pb_user_buffer *)buf;
}
static void
pb_user_buffer_destroy(struct pb_buffer *buf)
{
assert(buf);
FREE(buf);
}
static void *
pb_user_buffer_map(struct pb_buffer *buf,
unsigned flags)
{
return pb_user_buffer(buf)->data;
}
static void
pb_user_buffer_unmap(struct pb_buffer *buf)
{
/* No-op */
}
static void
pb_user_buffer_get_base_buffer(struct pb_buffer *buf,
struct pb_buffer **base_buf,
unsigned *offset)
{
*base_buf = buf;
*offset = 0;
}
const struct pb_vtbl
pb_user_buffer_vtbl = {
pb_user_buffer_destroy,
pb_user_buffer_map,
pb_user_buffer_unmap,
pb_user_buffer_get_base_buffer
};
static struct pipe_buffer *
pb_winsys_user_buffer_create(struct pipe_winsys *winsys,
void *data,
unsigned bytes)
{
struct pb_user_buffer *buf = CALLOC_STRUCT(pb_user_buffer);
if(!buf)
return NULL;
buf->base.base.refcount = 1;
buf->base.base.size = bytes;
buf->base.base.alignment = 0;
buf->base.base.usage = 0;
buf->base.vtbl = &pb_user_buffer_vtbl;
buf->data = data;
return &buf->base.base;
}
static void *
pb_winsys_buffer_map(struct pipe_winsys *winsys,
struct pipe_buffer *buf,
unsigned flags)
{
(void)winsys;
return pb_map(pb_buffer(buf), flags);
}
static void
pb_winsys_buffer_unmap(struct pipe_winsys *winsys,
struct pipe_buffer *buf)
{
(void)winsys;
pb_unmap(pb_buffer(buf));
}
static void
pb_winsys_buffer_destroy(struct pipe_winsys *winsys,
struct pipe_buffer *buf)
{
(void)winsys;
pb_destroy(pb_buffer(buf));
}
void
pb_init_winsys(struct pipe_winsys *winsys)
{
winsys->user_buffer_create = pb_winsys_user_buffer_create;
winsys->buffer_map = pb_winsys_buffer_map;
winsys->buffer_unmap = pb_winsys_buffer_unmap;
winsys->buffer_destroy = pb_winsys_buffer_destroy;
}
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