1 /*
2 * Copyright © 2009 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 * Eric Anholt <eric@anholt.net>
25 *
26 */
27
28 #include "brw_context.h"
29 #include "brw_state.h"
30 #include "brw_defines.h"
31 #include "intel_batchbuffer.h"
32 #include "main/shaderapi.h"
33
34 static void
gen6_upload_gs_push_constants(struct brw_context * brw)35 gen6_upload_gs_push_constants(struct brw_context *brw)
36 {
37 struct brw_stage_state *stage_state = &brw->gs.base;
38
39 /* BRW_NEW_GEOMETRY_PROGRAM */
40 const struct brw_program *gp = brw_program_const(brw->geometry_program);
41
42 if (gp) {
43 /* BRW_NEW_GS_PROG_DATA */
44 struct brw_stage_prog_data *prog_data = brw->gs.base.prog_data;
45
46 _mesa_shader_write_subroutine_indices(&brw->ctx, MESA_SHADER_GEOMETRY);
47 gen6_upload_push_constants(brw, &gp->program, prog_data, stage_state,
48 AUB_TRACE_VS_CONSTANTS);
49 }
50
51 if (brw->gen >= 7)
52 gen7_upload_constant_state(brw, stage_state, gp, _3DSTATE_CONSTANT_GS);
53 }
54
55 const struct brw_tracked_state gen6_gs_push_constants = {
56 .dirty = {
57 .mesa = _NEW_PROGRAM_CONSTANTS |
58 _NEW_TRANSFORM,
59 .brw = BRW_NEW_BATCH |
60 BRW_NEW_BLORP |
61 BRW_NEW_GEOMETRY_PROGRAM |
62 BRW_NEW_GS_PROG_DATA |
63 BRW_NEW_PUSH_CONSTANT_ALLOCATION,
64 },
65 .emit = gen6_upload_gs_push_constants,
66 };
67
68 static void
upload_gs_state_for_tf(struct brw_context * brw)69 upload_gs_state_for_tf(struct brw_context *brw)
70 {
71 const struct gen_device_info *devinfo = &brw->screen->devinfo;
72
73 BEGIN_BATCH(7);
74 OUT_BATCH(_3DSTATE_GS << 16 | (7 - 2));
75 OUT_BATCH(brw->ff_gs.prog_offset);
76 OUT_BATCH(GEN6_GS_SPF_MODE | GEN6_GS_VECTOR_MASK_ENABLE);
77 OUT_BATCH(0); /* no scratch space */
78 OUT_BATCH((2 << GEN6_GS_DISPATCH_START_GRF_SHIFT) |
79 (brw->ff_gs.prog_data->urb_read_length << GEN6_GS_URB_READ_LENGTH_SHIFT));
80 OUT_BATCH(((devinfo->max_gs_threads - 1) << GEN6_GS_MAX_THREADS_SHIFT) |
81 GEN6_GS_STATISTICS_ENABLE |
82 GEN6_GS_SO_STATISTICS_ENABLE |
83 GEN6_GS_RENDERING_ENABLE);
84 OUT_BATCH(GEN6_GS_SVBI_PAYLOAD_ENABLE |
85 GEN6_GS_SVBI_POSTINCREMENT_ENABLE |
86 (brw->ff_gs.prog_data->svbi_postincrement_value <<
87 GEN6_GS_SVBI_POSTINCREMENT_VALUE_SHIFT) |
88 GEN6_GS_ENABLE);
89 ADVANCE_BATCH();
90 }
91
92 static void
upload_gs_state(struct brw_context * brw)93 upload_gs_state(struct brw_context *brw)
94 {
95 const struct gen_device_info *devinfo = &brw->screen->devinfo;
96 /* BRW_NEW_GEOMETRY_PROGRAM */
97 bool active = brw->geometry_program;
98 /* BRW_NEW_GS_PROG_DATA */
99 const struct brw_stage_state *stage_state = &brw->gs.base;
100 const struct brw_stage_prog_data *prog_data = stage_state->prog_data;
101 const struct brw_vue_prog_data *vue_prog_data =
102 brw_vue_prog_data(stage_state->prog_data);
103
104 if (!active || stage_state->push_const_size == 0) {
105 /* Disable the push constant buffers. */
106 BEGIN_BATCH(5);
107 OUT_BATCH(_3DSTATE_CONSTANT_GS << 16 | (5 - 2));
108 OUT_BATCH(0);
109 OUT_BATCH(0);
110 OUT_BATCH(0);
111 OUT_BATCH(0);
112 ADVANCE_BATCH();
113 } else {
114 BEGIN_BATCH(5);
115 OUT_BATCH(_3DSTATE_CONSTANT_GS << 16 |
116 GEN6_CONSTANT_BUFFER_0_ENABLE |
117 (5 - 2));
118 /* Pointer to the GS constant buffer. Covered by the set of
119 * state flags from gen6_upload_vs_constants
120 */
121 OUT_BATCH(stage_state->push_const_offset +
122 stage_state->push_const_size - 1);
123 OUT_BATCH(0);
124 OUT_BATCH(0);
125 OUT_BATCH(0);
126 ADVANCE_BATCH();
127 }
128
129 if (active) {
130 BEGIN_BATCH(7);
131 OUT_BATCH(_3DSTATE_GS << 16 | (7 - 2));
132 OUT_BATCH(stage_state->prog_offset);
133
134 /* GEN6_GS_SPF_MODE and GEN6_GS_VECTOR_MASK_ENABLE are enabled as it
135 * was previously done for gen6.
136 *
137 * TODO: test with both disabled to see if the HW is behaving
138 * as expected, like in gen7.
139 */
140 OUT_BATCH(GEN6_GS_SPF_MODE | GEN6_GS_VECTOR_MASK_ENABLE |
141 ((ALIGN(stage_state->sampler_count, 4)/4) <<
142 GEN6_GS_SAMPLER_COUNT_SHIFT) |
143 ((prog_data->binding_table.size_bytes / 4) <<
144 GEN6_GS_BINDING_TABLE_ENTRY_COUNT_SHIFT));
145
146 if (prog_data->total_scratch) {
147 OUT_RELOC(stage_state->scratch_bo,
148 I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER,
149 ffs(stage_state->per_thread_scratch) - 11);
150 } else {
151 OUT_BATCH(0); /* no scratch space */
152 }
153
154 OUT_BATCH((vue_prog_data->urb_read_length <<
155 GEN6_GS_URB_READ_LENGTH_SHIFT) |
156 (0 << GEN6_GS_URB_ENTRY_READ_OFFSET_SHIFT) |
157 (prog_data->dispatch_grf_start_reg <<
158 GEN6_GS_DISPATCH_START_GRF_SHIFT));
159
160 OUT_BATCH(((devinfo->max_gs_threads - 1) << GEN6_GS_MAX_THREADS_SHIFT) |
161 GEN6_GS_STATISTICS_ENABLE |
162 GEN6_GS_SO_STATISTICS_ENABLE |
163 GEN6_GS_RENDERING_ENABLE);
164
165 if (brw->geometry_program->info.has_transform_feedback_varyings) {
166 /* GEN6_GS_REORDER is equivalent to GEN7_GS_REORDER_TRAILING
167 * in gen7. SNB and IVB specs are the same regarding the reordering of
168 * TRISTRIP/TRISTRIP_REV vertices and triangle orientation, so we do
169 * the same thing in both generations. For more details, see the
170 * comment in gen7_gs_state.c
171 */
172 OUT_BATCH(GEN6_GS_REORDER |
173 GEN6_GS_SVBI_PAYLOAD_ENABLE |
174 GEN6_GS_ENABLE);
175 } else {
176 OUT_BATCH(GEN6_GS_REORDER | GEN6_GS_ENABLE);
177 }
178 ADVANCE_BATCH();
179 } else if (brw->ff_gs.prog_active) {
180 /* In gen6, transform feedback for the VS stage is done with an ad-hoc GS
181 * program. This function provides the needed 3DSTATE_GS for this.
182 */
183 upload_gs_state_for_tf(brw);
184 } else {
185 /* No GS function required */
186 BEGIN_BATCH(7);
187 OUT_BATCH(_3DSTATE_GS << 16 | (7 - 2));
188 OUT_BATCH(0); /* prog_bo */
189 OUT_BATCH((0 << GEN6_GS_SAMPLER_COUNT_SHIFT) |
190 (0 << GEN6_GS_BINDING_TABLE_ENTRY_COUNT_SHIFT));
191 OUT_BATCH(0); /* scratch space base offset */
192 OUT_BATCH((1 << GEN6_GS_DISPATCH_START_GRF_SHIFT) |
193 (0 << GEN6_GS_URB_READ_LENGTH_SHIFT) |
194 (0 << GEN6_GS_URB_ENTRY_READ_OFFSET_SHIFT));
195 OUT_BATCH((0 << GEN6_GS_MAX_THREADS_SHIFT) |
196 GEN6_GS_STATISTICS_ENABLE |
197 GEN6_GS_RENDERING_ENABLE);
198 OUT_BATCH(0);
199 ADVANCE_BATCH();
200 }
201 brw->gs.enabled = active;
202 }
203
204 const struct brw_tracked_state gen6_gs_state = {
205 .dirty = {
206 .mesa = _NEW_PROGRAM_CONSTANTS |
207 _NEW_TRANSFORM,
208 .brw = BRW_NEW_BATCH |
209 BRW_NEW_BLORP |
210 BRW_NEW_CONTEXT |
211 BRW_NEW_FF_GS_PROG_DATA |
212 BRW_NEW_GEOMETRY_PROGRAM |
213 BRW_NEW_GS_PROG_DATA |
214 BRW_NEW_PUSH_CONSTANT_ALLOCATION,
215 },
216 .emit = upload_gs_state,
217 };
218