1/**************************************************************************
2 *
3 * Copyright 2009 VMware, Inc.
4 * Copyright 2012 Marek Olšák <maraeo@gmail.com>
5 * All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the
9 * "Software"), to deal in the Software without restriction, including
10 * without limitation the rights to use, copy, modify, merge, publish,
11 * distribute, sub license, and/or sell copies of the Software, and to
12 * permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the
16 * next paragraph) shall be included in all copies or substantial portions
17 * of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
22 * IN NO EVENT SHALL THE AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR
23 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
24 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
25 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 *
27 **************************************************************************/
28
29/* A simple allocator that suballocates memory from a large buffer. */
30
31#ifndef U_SUBALLOC
32#define U_SUBALLOC
33
34#ifdef __cplusplus
35extern "C" {
36#endif
37
38struct pipe_context;
39
40struct u_suballocator {
41   struct pipe_context *pipe;
42
43   unsigned size;          /* Size of the whole buffer, in bytes. */
44   unsigned bind;          /* Bitmask of PIPE_BIND_* flags. */
45   enum pipe_resource_usage usage;
46   unsigned flags;         /* bitmask of PIPE_RESOURCE_FLAG_x */
47   boolean zero_buffer_memory; /* If the buffer contents should be zeroed. */
48
49   struct pipe_resource *buffer;   /* The buffer we suballocate from. */
50   unsigned offset; /* Aligned offset pointing at the first unused byte. */
51};
52
53void
54u_suballocator_init(struct u_suballocator *allocator,
55                    struct pipe_context *pipe,
56                    unsigned size, unsigned bind,
57                    enum pipe_resource_usage usage, unsigned flags,
58                    boolean zero_buffer_memory);
59
60void
61u_suballocator_destroy(struct u_suballocator *allocator);
62
63void
64u_suballocator_alloc(struct u_suballocator *allocator, unsigned size,
65                     unsigned alignment, unsigned *out_offset,
66                     struct pipe_resource **outbuf);
67
68#ifdef __cplusplus
69}
70#endif
71
72#endif
73