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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 malloc-based buffers to store data that can't be processed
* by the hardware.
*
* \author Jos� Fonseca <jrfonseca@tungstengraphics.com>
*/
#include <assert.h>
#include <stdlib.h>
#include "pb_buffer.h"
struct malloc_buffer
{
struct pb_buffer base;
void *data;
};
extern const struct pb_vtbl malloc_buffer_vtbl;
static INLINE struct malloc_buffer *
malloc_buffer(struct pb_buffer *buf)
{
assert(buf);
assert(buf->vtbl == &malloc_buffer_vtbl);
return (struct malloc_buffer *)buf;
}
static void
malloc_buffer_destroy(struct pb_buffer *buf)
{
free(malloc_buffer(buf)->data);
free(buf);
}
static void *
malloc_buffer_map(struct pb_buffer *buf,
unsigned flags)
{
return malloc_buffer(buf)->data;
}
static void
malloc_buffer_unmap(struct pb_buffer *buf)
{
/* No-op */
}
static void
malloc_buffer_get_base_buffer(struct pb_buffer *buf,
struct pb_buffer **base_buf,
unsigned *offset)
{
*base_buf = buf;
*offset = 0;
}
const struct pb_vtbl
malloc_buffer_vtbl = {
malloc_buffer_destroy,
malloc_buffer_map,
malloc_buffer_unmap,
malloc_buffer_get_base_buffer
};
struct pb_buffer *
pb_malloc_buffer_create( unsigned alignment,
unsigned usage,
unsigned size )
{
struct malloc_buffer *buf;
/* TODO: accept an alignment parameter */
/* TODO: do a single allocation */
buf = (struct malloc_buffer *)malloc(sizeof(struct malloc_buffer));
if(!buf)
return NULL;
buf->base.vtbl = &malloc_buffer_vtbl;
buf->base.base.alignment = alignment;
buf->base.base.usage = usage;
buf->base.base.size = size;
buf->data = malloc(size);
if(!buf->data) {
free(buf);
return NULL;
}
return &buf->base;
}
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