1 /*
2 * Copyright 2005 VMware, Inc.
3 * All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the
7 * "Software"), to deal in the Software without restriction, including
8 * without limitation the rights to use, copy, modify, merge, publish,
9 * distribute, sublicense, and/or sell copies of the Software, and to
10 * permit persons to whom the Software is furnished to do so, subject to
11 * the following conditions:
12 *
13 * The above copyright notice and this permission notice (including the
14 * next paragraph) shall be included in all copies or substantial portions
15 * of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
20 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
21 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
22 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
23 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 */
25
26 #ifndef INTEL_BUFFEROBJ_H
27 #define INTEL_BUFFEROBJ_H
28
29 #include "main/mtypes.h"
30
31 struct brw_context;
32 struct gl_buffer_object;
33
34
35 /**
36 * Intel vertex/pixel buffer object, derived from Mesa's gl_buffer_object.
37 */
38 struct intel_buffer_object
39 {
40 struct gl_buffer_object Base;
41 struct brw_bo *buffer; /* the low-level buffer manager's buffer handle */
42
43 struct brw_bo *range_map_bo[MAP_COUNT];
44
45 /**
46 * Alignment offset from the range_map_bo temporary mapping to the returned
47 * obj->Pointer (caused by GL_ARB_map_buffer_alignment).
48 */
49 unsigned map_extra[MAP_COUNT];
50
51 /** @{
52 * Tracking for what range of the BO may currently be in use by the GPU.
53 *
54 * Users often want to either glBufferSubData() or glMapBufferRange() a
55 * buffer object where some subset of it is busy on the GPU, without either
56 * stalling or doing an extra blit (since our blits are extra expensive,
57 * given that we have to reupload most of the 3D state when switching
58 * rings). We wish they'd just use glMapBufferRange() with the
59 * UNSYNC|INVALIDATE_RANGE flag or the INVALIDATE_BUFFER flag, but lots
60 * don't.
61 *
62 * To work around apps, we track what range of the BO we might have used on
63 * the GPU as vertex data, tranform feedback output, buffer textures, etc.,
64 * and just do glBufferSubData() with an unsynchronized map when they're
65 * outside of that range.
66 *
67 * If gpu_active_start > gpu_active_end, then the GPU is not currently
68 * accessing the BO (and we can map it without synchronization).
69 */
70 uint32_t gpu_active_start;
71 uint32_t gpu_active_end;
72
73 /** @{
74 * Tracking for what range of the BO may contain valid data.
75 *
76 * Users may create a large buffer object and only fill part of it
77 * with valid data. This is a conservative estimate of what part
78 * of the buffer contains valid data that we have to preserve.
79 */
80 uint32_t valid_data_start;
81 uint32_t valid_data_end;
82 /** @} */
83
84 /**
85 * If we've avoided stalls/blits using the active tracking, flag the buffer
86 * for (occasional) stalling in the future to avoid getting stuck in a
87 * cycle of blitting on buffer wraparound.
88 */
89 bool prefer_stall_to_blit;
90 /** @} */
91 };
92
93
94 /* Get the bm buffer associated with a GL bufferobject:
95 */
96 struct brw_bo *intel_bufferobj_buffer(struct brw_context *brw,
97 struct intel_buffer_object *obj,
98 uint32_t offset,
99 uint32_t size,
100 bool write);
101
102 void intel_upload_data(struct brw_context *brw,
103 const void *data,
104 uint32_t size,
105 uint32_t alignment,
106 struct brw_bo **out_bo,
107 uint32_t *out_offset);
108
109 void *intel_upload_space(struct brw_context *brw,
110 uint32_t size,
111 uint32_t alignment,
112 struct brw_bo **out_bo,
113 uint32_t *out_offset);
114
115 void intel_upload_finish(struct brw_context *brw);
116
117 /* Hook the bufferobject implementation into mesa:
118 */
119 void intelInitBufferObjectFuncs(struct dd_function_table *functions);
120
121 static inline struct intel_buffer_object *
intel_buffer_object(struct gl_buffer_object * obj)122 intel_buffer_object(struct gl_buffer_object *obj)
123 {
124 return (struct intel_buffer_object *) obj;
125 }
126
127 #endif
128