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
|
/*
* Copyright © 2011 Intel Corporation
*
* 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, sublicense,
* 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 NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS 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 gen7_sol_state.c
*
* Controls the stream output logic (SOL) stage of the gen7 hardware, which is
* used to implement GL_EXT_transform_feedback.
*/
#include "brw_context.h"
#include "brw_state.h"
#include "brw_defines.h"
#include "intel_batchbuffer.h"
#include "intel_buffer_objects.h"
#include "main/transformfeedback.h"
void
gen7_begin_transform_feedback(struct gl_context *ctx, GLenum mode,
struct gl_transform_feedback_object *obj)
{
struct brw_context *brw = brw_context(ctx);
struct brw_transform_feedback_object *brw_obj =
(struct brw_transform_feedback_object *) obj;
assert(brw->screen->devinfo.gen == 7);
/* Store the starting value of the SO_NUM_PRIMS_WRITTEN counters. */
brw_save_primitives_written_counters(brw, brw_obj);
/* Reset the SO buffer offsets to 0. */
if (!can_do_pipelined_register_writes(brw->screen)) {
intel_batchbuffer_flush(brw);
brw->batch.needs_sol_reset = true;
} else {
for (int i = 0; i < 4; i++) {
brw_load_register_imm32(brw, GEN7_SO_WRITE_OFFSET(i), 0);
}
}
brw_obj->primitive_mode = mode;
}
void
gen7_end_transform_feedback(struct gl_context *ctx,
struct gl_transform_feedback_object *obj)
{
/* After EndTransformFeedback, it's likely that the client program will try
* to draw using the contents of the transform feedback buffer as vertex
* input. In order for this to work, we need to flush the data through at
* least the GS stage of the pipeline, and flush out the render cache. For
* simplicity, just do a full flush.
*/
struct brw_context *brw = brw_context(ctx);
struct brw_transform_feedback_object *brw_obj =
(struct brw_transform_feedback_object *) obj;
/* Store the ending value of the SO_NUM_PRIMS_WRITTEN counters. */
if (!obj->Paused)
brw_save_primitives_written_counters(brw, brw_obj);
/* We've reached the end of a transform feedback begin/end block. This
* means that future DrawTransformFeedback() calls will need to pick up the
* results of the current counter, and that it's time to roll back the
* current primitive counter to zero.
*/
brw_obj->previous_counter = brw_obj->counter;
brw_reset_transform_feedback_counter(&brw_obj->counter);
/* EndTransformFeedback() means that we need to update the number of
* vertices written. Since it's only necessary if DrawTransformFeedback()
* is called and it means mapping a buffer object, we delay computing it
* until it's absolutely necessary to try and avoid stalls.
*/
brw_obj->vertices_written_valid = false;
}
void
gen7_pause_transform_feedback(struct gl_context *ctx,
struct gl_transform_feedback_object *obj)
{
struct brw_context *brw = brw_context(ctx);
struct brw_transform_feedback_object *brw_obj =
(struct brw_transform_feedback_object *) obj;
/* Flush any drawing so that the counters have the right values. */
brw_emit_mi_flush(brw);
assert(brw->screen->devinfo.gen == 7);
/* Save the SOL buffer offset register values. */
for (int i = 0; i < 4; i++) {
BEGIN_BATCH(3);
OUT_BATCH(MI_STORE_REGISTER_MEM | (3 - 2));
OUT_BATCH(GEN7_SO_WRITE_OFFSET(i));
OUT_RELOC(brw_obj->offset_bo, RELOC_WRITE, i * sizeof(uint32_t));
ADVANCE_BATCH();
}
/* Store the temporary ending value of the SO_NUM_PRIMS_WRITTEN counters.
* While this operation is paused, other transform feedback actions may
* occur, which will contribute to the counters. We need to exclude that
* from our counts.
*/
brw_save_primitives_written_counters(brw, brw_obj);
}
void
gen7_resume_transform_feedback(struct gl_context *ctx,
struct gl_transform_feedback_object *obj)
{
struct brw_context *brw = brw_context(ctx);
struct brw_transform_feedback_object *brw_obj =
(struct brw_transform_feedback_object *) obj;
assert(brw->screen->devinfo.gen == 7);
/* Reload the SOL buffer offset registers. */
for (int i = 0; i < 4; i++) {
BEGIN_BATCH(3);
OUT_BATCH(GEN7_MI_LOAD_REGISTER_MEM | (3 - 2));
OUT_BATCH(GEN7_SO_WRITE_OFFSET(i));
OUT_RELOC(brw_obj->offset_bo, RELOC_WRITE, i * sizeof(uint32_t));
ADVANCE_BATCH();
}
/* Store the new starting value of the SO_NUM_PRIMS_WRITTEN counters. */
brw_save_primitives_written_counters(brw, brw_obj);
}
|
