pb_buffer_malloc.c revision 92fcbf6e7bc622dcace226bb70ff6d5cdbdbaecb 
1/**************************************************************************
2 *
3 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28/**
29 * \file
30 * Implementation of malloc-based buffers to store data that can't be processed
31 * by the hardware.
32 *
33 * \author Jos� Fonseca <jrfonseca@tungstengraphics.com>
34 */
35
36
37#include "pipe/p_debug.h"
38#include "pipe/p_util.h"
39#include "pb_buffer.h"
40
41
42struct malloc_buffer
43{
44   struct pb_buffer base;
45   void *data;
46};
47
48
49extern const struct pb_vtbl malloc_buffer_vtbl;
50
51static INLINE struct malloc_buffer *
52malloc_buffer(struct pb_buffer *buf)
53{
54   assert(buf);
55   assert(buf->vtbl == &malloc_buffer_vtbl);
56   return (struct malloc_buffer *)buf;
57}
58
59
60static void
61malloc_buffer_destroy(struct pb_buffer *buf)
62{
63   align_free(malloc_buffer(buf)->data);
64   FREE(buf);
65}
66
67
68static void *
69malloc_buffer_map(struct pb_buffer *buf,
70                  unsigned flags)
71{
72   return malloc_buffer(buf)->data;
73}
74
75
76static void
77malloc_buffer_unmap(struct pb_buffer *buf)
78{
79   /* No-op */
80}
81
82
83static void
84malloc_buffer_get_base_buffer(struct pb_buffer *buf,
85                              struct pb_buffer **base_buf,
86                              unsigned *offset)
87{
88   *base_buf = buf;
89   *offset = 0;
90}
91
92
93const struct pb_vtbl
94malloc_buffer_vtbl = {
95      malloc_buffer_destroy,
96      malloc_buffer_map,
97      malloc_buffer_unmap,
98      malloc_buffer_get_base_buffer
99};
100
101
102struct pb_buffer *
103pb_malloc_buffer_create(size_t size,
104                   	const struct pb_desc *desc)
105{
106   struct malloc_buffer *buf;
107
108   /* TODO: do a single allocation */
109
110   buf = CALLOC_STRUCT(malloc_buffer);
111   if(!buf)
112      return NULL;
113
114   buf->base.base.refcount = 1;
115   buf->base.base.alignment = desc->alignment;
116   buf->base.base.usage = desc->usage;
117   buf->base.base.size = size;
118   buf->base.vtbl = &malloc_buffer_vtbl;
119
120   buf->data = align_malloc(size, desc->alignment < sizeof(void*) ? sizeof(void*) : desc->alignment);
121   if(!buf->data) {
122      align_free(buf);
123      return NULL;
124   }
125
126   return &buf->base;
127}
128