pipebuffer: Ondemand buffer manager.
[mesa.git] / src / gallium / auxiliary / pipebuffer / pb_bufmgr.h
1 /**************************************************************************
2 *
3 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
4 * All Rights Reserved.
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15 * next paragraph) shall be included in all copies or substantial portions
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27
28 /**
29 * \file
30 * Buffer management.
31 *
32 * A buffer manager does only one basic thing: it creates buffers. Actually,
33 * "buffer factory" would probably a more accurate description.
34 *
35 * You can chain buffer managers so that you can have a finer grained memory
36 * management and pooling.
37 *
38 * For example, for a simple batch buffer manager you would chain:
39 * - the native buffer manager, which provides DMA memory from the graphics
40 * memory space;
41 * - the pool buffer manager, which keep around a pool of equally sized buffers
42 * to avoid latency associated with the native buffer manager;
43 * - the fenced buffer manager, which will delay buffer destruction until the
44 * the moment the card finishing processing it.
45 *
46 * \author Jose Fonseca <jrfonseca@tungstengraphics.com>
47 */
48
49 #ifndef PB_BUFMGR_H_
50 #define PB_BUFMGR_H_
51
52
53 #include "pipe/p_compiler.h"
54 #include "pipe/p_error.h"
55
56
57 #ifdef __cplusplus
58 extern "C" {
59 #endif
60
61
62 struct pb_desc;
63 struct pipe_buffer;
64 struct pipe_winsys;
65
66
67 /**
68 * Abstract base class for all buffer managers.
69 */
70 struct pb_manager
71 {
72 void
73 (*destroy)( struct pb_manager *mgr );
74
75 struct pb_buffer *
76 (*create_buffer)( struct pb_manager *mgr,
77 size_t size,
78 const struct pb_desc *desc);
79
80 /**
81 * Flush all temporary-held buffers.
82 *
83 * Used mostly to aid debugging memory issues or to clean up resources when
84 * the drivers are long lived.
85 */
86 void
87 (*flush)( struct pb_manager *mgr );
88 };
89
90
91 /**
92 * Malloc buffer provider.
93 *
94 * Simple wrapper around pb_malloc_buffer_create for convenience.
95 */
96 struct pb_manager *
97 pb_malloc_bufmgr_create(void);
98
99
100 /**
101 * Static buffer pool sub-allocator.
102 *
103 * Manages the allocation of equally sized buffers. It does so by allocating
104 * a single big buffer and divide it equally sized buffers.
105 *
106 * It is meant to manage the allocation of batch buffer pools.
107 */
108 struct pb_manager *
109 pool_bufmgr_create(struct pb_manager *provider,
110 size_t n, size_t size,
111 const struct pb_desc *desc);
112
113
114 /**
115 * Static sub-allocator based the old memory manager.
116 *
117 * It managers buffers of different sizes. It does so by allocating a buffer
118 * with the size of the heap, and then using the old mm memory manager to manage
119 * that heap.
120 */
121 struct pb_manager *
122 mm_bufmgr_create(struct pb_manager *provider,
123 size_t size, size_t align2);
124
125 /**
126 * Same as mm_bufmgr_create.
127 *
128 * Buffer will be release when the manager is destroyed.
129 */
130 struct pb_manager *
131 mm_bufmgr_create_from_buffer(struct pb_buffer *buffer,
132 size_t size, size_t align2);
133
134
135 /**
136 * Slab sub-allocator.
137 */
138 struct pb_manager *
139 pb_slab_manager_create(struct pb_manager *provider,
140 size_t bufSize,
141 size_t slabSize,
142 const struct pb_desc *desc);
143
144 /**
145 * Allow a range of buffer size, by aggregating multiple slabs sub-allocators
146 * with different bucket sizes.
147 */
148 struct pb_manager *
149 pb_slab_range_manager_create(struct pb_manager *provider,
150 size_t minBufSize,
151 size_t maxBufSize,
152 size_t slabSize,
153 const struct pb_desc *desc);
154
155
156 /**
157 * Time-based buffer cache.
158 *
159 * This manager keeps a cache of destroyed buffers during a time interval.
160 */
161 struct pb_manager *
162 pb_cache_manager_create(struct pb_manager *provider,
163 unsigned usecs);
164
165
166 /**
167 * Fenced buffer manager.
168 *
169 * This manager is just meant for convenience. It wraps the buffers returned
170 * by another manager in fenced buffers, so that
171 *
172 * NOTE: the buffer manager that provides the buffers will be destroyed
173 * at the same time.
174 */
175 struct pb_manager *
176 fenced_bufmgr_create(struct pb_manager *provider,
177 struct pipe_winsys *winsys);
178
179
180 struct pb_manager *
181 pb_alt_manager_create(struct pb_manager *provider1,
182 struct pb_manager *provider2);
183
184
185 /**
186 * Ondemand buffer manager.
187 *
188 * Buffers are created in malloc'ed memory (fast and cached), and the constents
189 * is transfered to a buffer from the provider (typically in slow uncached
190 * memory) when there is an attempt to validate the buffer.
191 *
192 * Ideal for situations where one does not know before hand whether a given
193 * buffer will effectively be used by the hardware or not.
194 */
195 struct pb_manager *
196 pb_ondemand_manager_create(struct pb_manager *provider);
197
198
199 /**
200 * Debug buffer manager to detect buffer under- and overflows.
201 *
202 * Band size should be a multiple of the largest alignment
203 */
204 struct pb_manager *
205 pb_debug_manager_create(struct pb_manager *provider, size_t band_size);
206
207
208 #ifdef __cplusplus
209 }
210 #endif
211
212 #endif /*PB_BUFMGR_H_*/