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 #include "pipe/p_defines.h"
32 #include "util/u_inlines.h"
33 #include "pipe/p_context.h"
34 #include "util/u_memory.h"
35 #include "util/u_math.h"
36
37 #include "u_suballoc.h"
38
39 /**
40 * Create a suballocator.
41 *
42 * \param flags bitmask of PIPE_RESOURCE_FLAG_x
43 * \param zero_buffer_memory determines whether the buffer contents should be
44 * cleared to 0 after the allocation.
45 *
46 */
47 void
u_suballocator_init(struct u_suballocator * allocator,struct pipe_context * pipe,unsigned size,unsigned bind,enum pipe_resource_usage usage,unsigned flags,boolean zero_buffer_memory)48 u_suballocator_init(struct u_suballocator *allocator,
49 struct pipe_context *pipe,
50 unsigned size, unsigned bind,
51 enum pipe_resource_usage usage, unsigned flags,
52 boolean zero_buffer_memory)
53 {
54 memset(allocator, 0, sizeof(*allocator));
55
56 allocator->pipe = pipe;
57 allocator->size = size;
58 allocator->bind = bind;
59 allocator->usage = usage;
60 allocator->flags = flags;
61 allocator->zero_buffer_memory = zero_buffer_memory;
62 }
63
64 void
u_suballocator_destroy(struct u_suballocator * allocator)65 u_suballocator_destroy(struct u_suballocator *allocator)
66 {
67 pipe_resource_reference(&allocator->buffer, NULL);
68 }
69
70 void
u_suballocator_alloc(struct u_suballocator * allocator,unsigned size,unsigned alignment,unsigned * out_offset,struct pipe_resource ** outbuf)71 u_suballocator_alloc(struct u_suballocator *allocator, unsigned size,
72 unsigned alignment, unsigned *out_offset,
73 struct pipe_resource **outbuf)
74 {
75 allocator->offset = align(allocator->offset, alignment);
76
77 /* Don't allow allocations larger than the buffer size. */
78 if (size > allocator->size)
79 goto fail;
80
81 /* Make sure we have enough space in the buffer. */
82 if (!allocator->buffer ||
83 allocator->offset + size > allocator->size) {
84 /* Allocate a new buffer. */
85 pipe_resource_reference(&allocator->buffer, NULL);
86 allocator->offset = 0;
87
88 struct pipe_resource templ;
89 memset(&templ, 0, sizeof(templ));
90 templ.target = PIPE_BUFFER;
91 templ.format = PIPE_FORMAT_R8_UNORM;
92 templ.bind = allocator->bind;
93 templ.usage = allocator->usage;
94 templ.flags = allocator->flags;
95 templ.width0 = allocator->size;
96 templ.height0 = 1;
97 templ.depth0 = 1;
98 templ.array_size = 1;
99
100 struct pipe_screen *screen = allocator->pipe->screen;
101 allocator->buffer = screen->resource_create(screen, &templ);
102 if (!allocator->buffer)
103 goto fail;
104
105 /* Clear the memory if needed. */
106 if (allocator->zero_buffer_memory) {
107 struct pipe_context *pipe = allocator->pipe;
108
109 if (pipe->clear_buffer) {
110 unsigned clear_value = 0;
111
112 pipe->clear_buffer(pipe, allocator->buffer, 0, allocator->size,
113 &clear_value, 4);
114 } else {
115 struct pipe_transfer *transfer = NULL;
116 void *ptr = pipe_buffer_map(pipe, allocator->buffer,
117 PIPE_MAP_WRITE, &transfer);
118 memset(ptr, 0, allocator->size);
119 pipe_buffer_unmap(pipe, transfer);
120 }
121 }
122 }
123
124 assert(allocator->offset % alignment == 0);
125 assert(allocator->offset < allocator->buffer->width0);
126 assert(allocator->offset + size <= allocator->buffer->width0);
127
128 /* Return the buffer. */
129 *out_offset = allocator->offset;
130 pipe_resource_reference(outbuf, allocator->buffer);
131
132 allocator->offset += size;
133 return;
134
135 fail:
136 pipe_resource_reference(outbuf, NULL);
137 }
138