1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
/**************************************************************************
*
* 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
* Generic code for buffers.
*
* Behind a pipe buffle handle there can be DMA buffers, client (or user)
* buffers, regular malloced buffers, etc. This file provides an abstract base
* buffer handle that allows the driver to cope with all those kinds of buffers
* in a more flexible way.
*
* There is no obligation of a winsys driver to use this library. And a pipe
* driver should be completly agnostic about it.
*
* \author José Fonseca <jrfonseca@tungstengraphics.com>
*/
#ifndef PB_BUFFER_H_
#define PB_BUFFER_H_
#include <assert.h>
#include <stdlib.h>
#include "pipe/p_compiler.h"
#include "pipe/p_state.h"
#include "pipe/p_inlines.h"
struct pb_vtbl;
/**
* Buffer description.
*
* Used when allocating the buffer.
*/
struct pb_desc
{
unsigned alignment;
unsigned usage;
};
/**
* Base class for all pb_* buffers.
*/
struct pb_buffer
{
struct pipe_buffer base;
/**
* Pointer to the virtual function table.
*
* Avoid accessing this table directly. Use the inline functions below
* instead to avoid mistakes.
*/
const struct pb_vtbl *vtbl;
};
/**
* Virtual function table for the buffer storage operations.
*
* Note that creation is not done through this table.
*/
struct pb_vtbl
{
void (*destroy)( struct pb_buffer *buf );
/**
* Map the entire data store of a buffer object into the client's address.
* flags is bitmask of PIPE_BUFFER_FLAG_READ/WRITE.
*/
void *(*map)( struct pb_buffer *buf,
unsigned flags );
void (*unmap)( struct pb_buffer *buf );
/**
* Get the base buffer and the offset.
*
* A buffer can be subdivided in smaller buffers. This method should return
* the underlaying buffer, and the relative offset.
*
* Buffers without an underlaying base buffer should return themselves, with
* a zero offset.
*
* Note that this will increase the reference count of the base buffer.
*/
void (*get_base_buffer)( struct pb_buffer *buf,
struct pb_buffer **base_buf,
unsigned *offset );
};
static INLINE struct pipe_buffer *
pb_pipe_buffer( struct pb_buffer *pbuf )
{
assert(pbuf);
return &pbuf->base;
}
static INLINE struct pb_buffer *
pb_buffer( struct pipe_buffer *buf )
{
assert(buf);
/* Could add a magic cookie check on debug builds.
*/
return (struct pb_buffer *)buf;
}
/* Accessor functions for pb->vtbl:
*/
static INLINE void *
pb_map(struct pb_buffer *buf,
unsigned flags)
{
assert(buf);
return buf->vtbl->map(buf, flags);
}
static INLINE void
pb_unmap(struct pb_buffer *buf)
{
assert(buf);
buf->vtbl->unmap(buf);
}
static INLINE void
pb_get_base_buffer( struct pb_buffer *buf,
struct pb_buffer **base_buf,
unsigned *offset )
{
buf->vtbl->get_base_buffer(buf, base_buf, offset);
}
static INLINE void
pb_destroy(struct pb_buffer *buf)
{
assert(buf);
buf->vtbl->destroy(buf);
}
/* XXX: thread safety issues!
*/
static INLINE void
pb_reference(struct pb_buffer **dst,
struct pb_buffer *src)
{
if (src)
src->base.refcount++;
if (*dst && --(*dst)->base.refcount == 0)
pb_destroy( *dst );
*dst = src;
}
/**
* Malloc-based buffer to store data that can't be used by the graphics
* hardware.
*/
struct pb_buffer *
pb_malloc_buffer_create(size_t size,
const struct pb_desc *desc);
void
pb_init_winsys(struct pipe_winsys *winsys);
#endif /*PB_BUFFER_H_*/
|
