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 "brw_util.h"
32 #include "program/prog_parameter.h"
33 #include "program/prog_statevars.h"
34 #include "intel_batchbuffer.h"
35
36 static void
gen6_upload_vs_push_constants(struct brw_context * brw)37 gen6_upload_vs_push_constants(struct brw_context *brw)
38 {
39 struct intel_context *intel = &brw->intel;
40 struct gl_context *ctx = &intel->ctx;
41 /* _BRW_NEW_VERTEX_PROGRAM */
42 const struct brw_vertex_program *vp =
43 brw_vertex_program_const(brw->vertex_program);
44 unsigned int nr_params = brw->vs.prog_data->nr_params / 4;
45 bool uses_clip_distance = vp->program.UsesClipDistance;
46
47 if (brw->vertex_program->IsNVProgram)
48 _mesa_load_tracked_matrices(ctx);
49
50 /* Updates the ParamaterValues[i] pointers for all parameters of the
51 * basic type of PROGRAM_STATE_VAR.
52 */
53 /* XXX: Should this happen somewhere before to get our state flag set? */
54 _mesa_load_state_parameters(ctx, vp->program.Base.Parameters);
55
56 /* CACHE_NEW_VS_PROG | _NEW_TRANSFORM */
57 if (brw->vs.prog_data->nr_params == 0 && !ctx->Transform.ClipPlanesEnabled) {
58 brw->vs.push_const_size = 0;
59 } else {
60 int params_uploaded = 0;
61 float *param;
62 int i;
63
64 param = brw_state_batch(brw, AUB_TRACE_VS_CONSTANTS,
65 (MAX_CLIP_PLANES + nr_params) *
66 4 * sizeof(float),
67 32, &brw->vs.push_const_offset);
68
69 if (brw->vs.prog_data->uses_new_param_layout) {
70 for (i = 0; i < brw->vs.prog_data->nr_params; i++) {
71 *param = *brw->vs.prog_data->param[i];
72 param++;
73 }
74 params_uploaded += brw->vs.prog_data->nr_params / 4;
75 } else {
76 /* This should be loaded like any other param, but it's ad-hoc
77 * until we redo the VS backend.
78 */
79 if (ctx->Transform.ClipPlanesEnabled != 0 && !uses_clip_distance) {
80 gl_clip_plane *clip_planes = brw_select_clip_planes(ctx);
81 int num_userclip_plane_consts
82 = _mesa_logbase2(ctx->Transform.ClipPlanesEnabled) + 1;
83 int num_floats = 4 * num_userclip_plane_consts;
84 memcpy(param, clip_planes, num_floats * sizeof(float));
85 param += num_floats;
86 params_uploaded += num_userclip_plane_consts;
87 }
88
89 /* Align to a reg for convenience for brw_vs_emit.c */
90 if (params_uploaded & 1) {
91 param += 4;
92 params_uploaded++;
93 }
94
95 for (i = 0; i < vp->program.Base.Parameters->NumParameters; i++) {
96 if (brw->vs.constant_map[i] != -1) {
97 memcpy(param + brw->vs.constant_map[i] * 4,
98 vp->program.Base.Parameters->ParameterValues[i],
99 4 * sizeof(float));
100 params_uploaded++;
101 }
102 }
103 }
104
105 if (0) {
106 printf("VS constant buffer:\n");
107 for (i = 0; i < params_uploaded; i++) {
108 float *buf = param + i * 4;
109 printf("%d: %f %f %f %f\n",
110 i, buf[0], buf[1], buf[2], buf[3]);
111 }
112 }
113
114 brw->vs.push_const_size = (params_uploaded + 1) / 2;
115 /* We can only push 32 registers of constants at a time. */
116 assert(brw->vs.push_const_size <= 32);
117 }
118 }
119
120 const struct brw_tracked_state gen6_vs_push_constants = {
121 .dirty = {
122 .mesa = _NEW_TRANSFORM | _NEW_PROGRAM_CONSTANTS,
123 .brw = (BRW_NEW_BATCH |
124 BRW_NEW_VERTEX_PROGRAM),
125 .cache = CACHE_NEW_VS_PROG,
126 },
127 .emit = gen6_upload_vs_push_constants,
128 };
129
130 static void
upload_vs_state(struct brw_context * brw)131 upload_vs_state(struct brw_context *brw)
132 {
133 struct intel_context *intel = &brw->intel;
134 uint32_t floating_point_mode = 0;
135
136 /* From the BSpec, Volume 2a, Part 3 "Vertex Shader", Section
137 * 3DSTATE_VS, Dword 5.0 "VS Function Enable":
138 * [DevSNB] A pipeline flush must be programmed prior to a 3DSTATE_VS
139 * command that causes the VS Function Enable to toggle. Pipeline
140 * flush can be executed by sending a PIPE_CONTROL command with CS
141 * stall bit set and a post sync operation.
142 */
143 intel_emit_post_sync_nonzero_flush(intel);
144
145 if (brw->vs.push_const_size == 0) {
146 /* Disable the push constant buffers. */
147 BEGIN_BATCH(5);
148 OUT_BATCH(_3DSTATE_CONSTANT_VS << 16 | (5 - 2));
149 OUT_BATCH(0);
150 OUT_BATCH(0);
151 OUT_BATCH(0);
152 OUT_BATCH(0);
153 ADVANCE_BATCH();
154 } else {
155 BEGIN_BATCH(5);
156 OUT_BATCH(_3DSTATE_CONSTANT_VS << 16 |
157 GEN6_CONSTANT_BUFFER_0_ENABLE |
158 (5 - 2));
159 /* Pointer to the VS constant buffer. Covered by the set of
160 * state flags from gen6_upload_vs_constants
161 */
162 OUT_BATCH(brw->vs.push_const_offset +
163 brw->vs.push_const_size - 1);
164 OUT_BATCH(0);
165 OUT_BATCH(0);
166 OUT_BATCH(0);
167 ADVANCE_BATCH();
168 }
169
170 /* Use ALT floating point mode for ARB vertex programs, because they
171 * require 0^0 == 1.
172 */
173 if (intel->ctx.Shader.CurrentVertexProgram == NULL)
174 floating_point_mode = GEN6_VS_FLOATING_POINT_MODE_ALT;
175
176 BEGIN_BATCH(6);
177 OUT_BATCH(_3DSTATE_VS << 16 | (6 - 2));
178 OUT_BATCH(brw->vs.prog_offset);
179 OUT_BATCH(floating_point_mode |
180 ((ALIGN(brw->sampler.count, 4)/4) << GEN6_VS_SAMPLER_COUNT_SHIFT));
181
182 if (brw->vs.prog_data->total_scratch) {
183 OUT_RELOC(brw->vs.scratch_bo,
184 I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER,
185 ffs(brw->vs.prog_data->total_scratch) - 11);
186 } else {
187 OUT_BATCH(0);
188 }
189
190 OUT_BATCH((1 << GEN6_VS_DISPATCH_START_GRF_SHIFT) |
191 (brw->vs.prog_data->urb_read_length << GEN6_VS_URB_READ_LENGTH_SHIFT) |
192 (0 << GEN6_VS_URB_ENTRY_READ_OFFSET_SHIFT));
193
194 OUT_BATCH(((brw->max_vs_threads - 1) << GEN6_VS_MAX_THREADS_SHIFT) |
195 GEN6_VS_STATISTICS_ENABLE |
196 GEN6_VS_ENABLE);
197 ADVANCE_BATCH();
198
199 /* Based on my reading of the simulator, the VS constants don't get
200 * pulled into the VS FF unit until an appropriate pipeline flush
201 * happens, and instead the 3DSTATE_CONSTANT_VS packet just adds
202 * references to them into a little FIFO. The flushes are common,
203 * but don't reliably happen between this and a 3DPRIMITIVE, causing
204 * the primitive to use the wrong constants. Then the FIFO
205 * containing the constant setup gets added to again on the next
206 * constants change, and eventually when a flush does happen the
207 * unit is overwhelmed by constant changes and dies.
208 *
209 * To avoid this, send a PIPE_CONTROL down the line that will
210 * update the unit immediately loading the constants. The flush
211 * type bits here were those set by the STATE_BASE_ADDRESS whose
212 * move in a82a43e8d99e1715dd11c9c091b5ab734079b6a6 triggered the
213 * bug reports that led to this workaround, and may be more than
214 * what is strictly required to avoid the issue.
215 */
216 intel_emit_post_sync_nonzero_flush(intel);
217
218 BEGIN_BATCH(4);
219 OUT_BATCH(_3DSTATE_PIPE_CONTROL | (4 - 2));
220 OUT_BATCH(PIPE_CONTROL_DEPTH_STALL |
221 PIPE_CONTROL_INSTRUCTION_FLUSH |
222 PIPE_CONTROL_STATE_CACHE_INVALIDATE);
223 OUT_BATCH(0); /* address */
224 OUT_BATCH(0); /* write data */
225 ADVANCE_BATCH();
226 }
227
228 const struct brw_tracked_state gen6_vs_state = {
229 .dirty = {
230 .mesa = _NEW_TRANSFORM | _NEW_PROGRAM_CONSTANTS,
231 .brw = (BRW_NEW_CONTEXT |
232 BRW_NEW_VERTEX_PROGRAM |
233 BRW_NEW_BATCH),
234 .cache = CACHE_NEW_VS_PROG | CACHE_NEW_SAMPLER
235 },
236 .emit = upload_vs_state,
237 };
238