pb_buffer_malloc.c revision 287c94ea4987033f9c99a2f91c5750c9083504ca 
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 Jose Fonseca <jrfonseca@tungstengraphics.com>
34 */
35
36
37#include "util/u_debug.h"
38#include "util/u_memory.h"
39#include "pb_buffer.h"
40#include "pb_bufmgr.h"
41
42
43struct malloc_buffer
44{
45   struct pb_buffer base;
46   void *data;
47};
48
49
50extern const struct pb_vtbl malloc_buffer_vtbl;
51
52static INLINE struct malloc_buffer *
53malloc_buffer(struct pb_buffer *buf)
54{
55   assert(buf);
56   if (!buf)
57      return NULL;
58   assert(buf->vtbl == &malloc_buffer_vtbl);
59   return (struct malloc_buffer *)buf;
60}
61
62
63static void
64malloc_buffer_destroy(struct pb_buffer *buf)
65{
66   align_free(malloc_buffer(buf)->data);
67   FREE(buf);
68}
69
70
71static void *
72malloc_buffer_map(struct pb_buffer *buf,
73                  unsigned flags)
74{
75   return malloc_buffer(buf)->data;
76}
77
78
79static void
80malloc_buffer_unmap(struct pb_buffer *buf)
81{
82   /* No-op */
83}
84
85
86static enum pipe_error
87malloc_buffer_validate(struct pb_buffer *buf,
88                       struct pb_validate *vl,
89                       unsigned flags)
90{
91   assert(0);
92   return PIPE_ERROR;
93}
94
95
96static void
97malloc_buffer_fence(struct pb_buffer *buf,
98                    struct pipe_fence_handle *fence)
99{
100   assert(0);
101}
102
103
104static void
105malloc_buffer_get_base_buffer(struct pb_buffer *buf,
106                              struct pb_buffer **base_buf,
107                              pb_size *offset)
108{
109   *base_buf = buf;
110   *offset = 0;
111}
112
113
114const struct pb_vtbl
115malloc_buffer_vtbl = {
116      malloc_buffer_destroy,
117      malloc_buffer_map,
118      malloc_buffer_unmap,
119      malloc_buffer_validate,
120      malloc_buffer_fence,
121      malloc_buffer_get_base_buffer
122};
123
124
125struct pb_buffer *
126pb_malloc_buffer_create(pb_size size,
127                   	const struct pb_desc *desc)
128{
129   struct malloc_buffer *buf;
130
131   /* TODO: do a single allocation */
132
133   buf = CALLOC_STRUCT(malloc_buffer);
134   if(!buf)
135      return NULL;
136
137   pipe_reference_init(&buf->base.base.reference, 1);
138   buf->base.base.usage = desc->usage;
139   buf->base.base.size = size;
140   buf->base.base.alignment = desc->alignment;
141   buf->base.vtbl = &malloc_buffer_vtbl;
142
143   buf->data = align_malloc(size, desc->alignment < sizeof(void*) ? sizeof(void*) : desc->alignment);
144   if(!buf->data) {
145      FREE(buf);
146      return NULL;
147   }
148
149   return &buf->base;
150}
151
152
153static struct pb_buffer *
154pb_malloc_bufmgr_create_buffer(struct pb_manager *mgr,
155                               pb_size size,
156                               const struct pb_desc *desc)
157{
158   return pb_malloc_buffer_create(size, desc);
159}
160
161
162static void
163pb_malloc_bufmgr_flush(struct pb_manager *mgr)
164{
165   /* No-op */
166}
167
168
169static void
170pb_malloc_bufmgr_destroy(struct pb_manager *mgr)
171{
172   /* No-op */
173}
174
175
176static struct pb_manager
177pb_malloc_bufmgr = {
178   pb_malloc_bufmgr_destroy,
179   pb_malloc_bufmgr_create_buffer,
180   pb_malloc_bufmgr_flush
181};
182
183
184struct pb_manager *
185pb_malloc_bufmgr_create(void)
186{
187  return &pb_malloc_bufmgr;
188}
189