1 /*
2 * Copyright © 2014 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 *
23 * Authors:
24 * Neil Roberts <neil@linux.intel.com>
25 */
26
27 /** @file brw_conditional_render.c
28 *
29 * Support for conditional rendering based on query objects
30 * (GL_NV_conditional_render, GL_ARB_conditional_render_inverted) on Gen7+.
31 */
32
33 #include "main/imports.h"
34 #include "main/condrender.h"
35
36 #include "brw_context.h"
37 #include "brw_defines.h"
38 #include "intel_batchbuffer.h"
39
40 static void
set_predicate_enable(struct brw_context * brw,bool value)41 set_predicate_enable(struct brw_context *brw,
42 bool value)
43 {
44 if (value)
45 brw->predicate.state = BRW_PREDICATE_STATE_RENDER;
46 else
47 brw->predicate.state = BRW_PREDICATE_STATE_DONT_RENDER;
48 }
49
50 static void
set_predicate_for_overflow_query(struct brw_context * brw,struct brw_query_object * query,int stream_start,int count)51 set_predicate_for_overflow_query(struct brw_context *brw,
52 struct brw_query_object *query,
53 int stream_start, int count)
54 {
55 if (!can_do_mi_math_and_lrr(brw->screen)) {
56 brw->predicate.state = BRW_PREDICATE_STATE_STALL_FOR_QUERY;
57 return;
58 }
59
60 brw->predicate.state = BRW_PREDICATE_STATE_USE_BIT;
61
62 /* Needed to ensure the memory is coherent for the MI_LOAD_REGISTER_MEM
63 * command when loading the values into the predicate source registers for
64 * conditional rendering.
65 */
66 brw_emit_pipe_control_flush(brw, PIPE_CONTROL_FLUSH_ENABLE);
67
68 hsw_overflow_result_to_gpr0(brw, query, count);
69 brw_load_register_reg64(brw, HSW_CS_GPR(0), MI_PREDICATE_SRC0);
70 brw_load_register_imm64(brw, MI_PREDICATE_SRC1, 0ull);
71 }
72
73 static void
set_predicate_for_occlusion_query(struct brw_context * brw,struct brw_query_object * query)74 set_predicate_for_occlusion_query(struct brw_context *brw,
75 struct brw_query_object *query)
76 {
77 if (!brw->predicate.supported) {
78 brw->predicate.state = BRW_PREDICATE_STATE_STALL_FOR_QUERY;
79 return;
80 }
81
82 brw->predicate.state = BRW_PREDICATE_STATE_USE_BIT;
83
84 /* Needed to ensure the memory is coherent for the MI_LOAD_REGISTER_MEM
85 * command when loading the values into the predicate source registers for
86 * conditional rendering.
87 */
88 brw_emit_pipe_control_flush(brw, PIPE_CONTROL_FLUSH_ENABLE);
89
90 brw_load_register_mem64(brw, MI_PREDICATE_SRC0, query->bo, 0 /* offset */);
91 brw_load_register_mem64(brw, MI_PREDICATE_SRC1, query->bo, 8 /* offset */);
92 }
93
94 static void
set_predicate_for_result(struct brw_context * brw,struct brw_query_object * query,bool inverted)95 set_predicate_for_result(struct brw_context *brw,
96 struct brw_query_object *query,
97 bool inverted)
98 {
99 int load_op;
100
101 assert(query->bo != NULL);
102
103 switch (query->Base.Target) {
104 case GL_TRANSFORM_FEEDBACK_STREAM_OVERFLOW_ARB:
105 set_predicate_for_overflow_query(brw, query, 0, 1);
106 break;
107 case GL_TRANSFORM_FEEDBACK_OVERFLOW_ARB:
108 set_predicate_for_overflow_query(brw, query, 0, MAX_VERTEX_STREAMS);
109 break;
110 default:
111 set_predicate_for_occlusion_query(brw, query);
112 }
113
114 if (brw->predicate.state == BRW_PREDICATE_STATE_USE_BIT) {
115 if (inverted)
116 load_op = MI_PREDICATE_LOADOP_LOAD;
117 else
118 load_op = MI_PREDICATE_LOADOP_LOADINV;
119
120 BEGIN_BATCH(1);
121 OUT_BATCH(GEN7_MI_PREDICATE |
122 load_op |
123 MI_PREDICATE_COMBINEOP_SET |
124 MI_PREDICATE_COMPAREOP_SRCS_EQUAL);
125 ADVANCE_BATCH();
126 }
127 }
128
129 static void
brw_begin_conditional_render(struct gl_context * ctx,struct gl_query_object * q,GLenum mode)130 brw_begin_conditional_render(struct gl_context *ctx,
131 struct gl_query_object *q,
132 GLenum mode)
133 {
134 struct brw_context *brw = brw_context(ctx);
135 struct brw_query_object *query = (struct brw_query_object *) q;
136 bool inverted;
137
138 switch (mode) {
139 case GL_QUERY_WAIT:
140 case GL_QUERY_NO_WAIT:
141 case GL_QUERY_BY_REGION_WAIT:
142 case GL_QUERY_BY_REGION_NO_WAIT:
143 inverted = false;
144 break;
145 case GL_QUERY_WAIT_INVERTED:
146 case GL_QUERY_NO_WAIT_INVERTED:
147 case GL_QUERY_BY_REGION_WAIT_INVERTED:
148 case GL_QUERY_BY_REGION_NO_WAIT_INVERTED:
149 inverted = true;
150 break;
151 default:
152 unreachable("Unexpected conditional render mode");
153 }
154
155 /* If there are already samples from a BLT operation or if the query object
156 * is ready then we can avoid looking at the values in the buffer and just
157 * decide whether to draw using the CPU without stalling.
158 */
159 if (query->Base.Result || query->Base.Ready)
160 set_predicate_enable(brw, (query->Base.Result != 0) ^ inverted);
161 else
162 set_predicate_for_result(brw, query, inverted);
163 }
164
165 static void
brw_end_conditional_render(struct gl_context * ctx,struct gl_query_object * q)166 brw_end_conditional_render(struct gl_context *ctx,
167 struct gl_query_object *q)
168 {
169 struct brw_context *brw = brw_context(ctx);
170
171 /* When there is no longer a conditional render in progress it should
172 * always render.
173 */
174 brw->predicate.state = BRW_PREDICATE_STATE_RENDER;
175 }
176
177 void
brw_init_conditional_render_functions(struct dd_function_table * functions)178 brw_init_conditional_render_functions(struct dd_function_table *functions)
179 {
180 functions->BeginConditionalRender = brw_begin_conditional_render;
181 functions->EndConditionalRender = brw_end_conditional_render;
182 }
183
184 bool
brw_check_conditional_render(struct brw_context * brw)185 brw_check_conditional_render(struct brw_context *brw)
186 {
187 if (brw->predicate.state == BRW_PREDICATE_STATE_STALL_FOR_QUERY) {
188 perf_debug("Conditional rendering is implemented in software and may "
189 "stall.\n");
190 return _mesa_check_conditional_render(&brw->ctx);
191 }
192
193 return brw->predicate.state != BRW_PREDICATE_STATE_DONT_RENDER;
194 }
195