2 * Copyright © 2010 Intel Corporation
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:
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
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
24 /** @file brw_fs_visitor.cpp
26 * This file supports generating the FS LIR from the GLSL IR. The LIR
27 * makes it easier to do backend-specific optimizations than doing so
28 * in the GLSL IR or in the native code.
31 #include "compiler/glsl_types.h"
35 /* Sample from the MCS surface attached to this multisample texture. */
37 fs_visitor::emit_mcs_fetch(const fs_reg
&coordinate
, unsigned components
,
38 const fs_reg
&texture
)
40 const fs_reg dest
= vgrf(glsl_type::uvec4_type
);
42 fs_reg srcs
[TEX_LOGICAL_NUM_SRCS
];
43 srcs
[TEX_LOGICAL_SRC_COORDINATE
] = coordinate
;
44 srcs
[TEX_LOGICAL_SRC_SURFACE
] = texture
;
45 srcs
[TEX_LOGICAL_SRC_SAMPLER
] = texture
;
46 srcs
[TEX_LOGICAL_SRC_COORD_COMPONENTS
] = brw_imm_d(components
);
47 srcs
[TEX_LOGICAL_SRC_GRAD_COMPONENTS
] = brw_imm_d(0);
49 fs_inst
*inst
= bld
.emit(SHADER_OPCODE_TXF_MCS_LOGICAL
, dest
, srcs
,
52 /* We only care about one or two regs of response, but the sampler always
55 inst
->size_written
= 4 * dest
.component_size(inst
->exec_size
);
61 * Apply workarounds for Gen6 gather with UINT/SINT
64 fs_visitor::emit_gen6_gather_wa(uint8_t wa
, fs_reg dst
)
69 int width
= (wa
& WA_8BIT
) ? 8 : 16;
71 for (int i
= 0; i
< 4; i
++) {
72 fs_reg dst_f
= retype(dst
, BRW_REGISTER_TYPE_F
);
73 /* Convert from UNORM to UINT */
74 bld
.MUL(dst_f
, dst_f
, brw_imm_f((1 << width
) - 1));
78 /* Reinterpret the UINT value as a signed INT value by
79 * shifting the sign bit into place, then shifting back
82 bld
.SHL(dst
, dst
, brw_imm_d(32 - width
));
83 bld
.ASR(dst
, dst
, brw_imm_d(32 - width
));
86 dst
= offset(dst
, bld
, 1);
90 /** Emits a dummy fragment shader consisting of magenta for bringup purposes. */
92 fs_visitor::emit_dummy_fs()
94 int reg_width
= dispatch_width
/ 8;
96 /* Everyone's favorite color. */
97 const float color
[4] = { 1.0, 0.0, 1.0, 0.0 };
98 for (int i
= 0; i
< 4; i
++) {
99 bld
.MOV(fs_reg(MRF
, 2 + i
* reg_width
, BRW_REGISTER_TYPE_F
),
100 brw_imm_f(color
[i
]));
104 write
= bld
.emit(FS_OPCODE_FB_WRITE
);
106 if (devinfo
->gen
>= 6) {
108 write
->mlen
= 4 * reg_width
;
110 write
->header_size
= 2;
112 write
->mlen
= 2 + 4 * reg_width
;
115 /* Tell the SF we don't have any inputs. Gen4-5 require at least one
116 * varying to avoid GPU hangs, so set that.
118 struct brw_wm_prog_data
*wm_prog_data
= brw_wm_prog_data(this->prog_data
);
119 wm_prog_data
->num_varying_inputs
= devinfo
->gen
< 6 ? 1 : 0;
120 memset(wm_prog_data
->urb_setup
, -1,
121 sizeof(wm_prog_data
->urb_setup
[0]) * VARYING_SLOT_MAX
);
123 /* We don't have any uniforms. */
124 stage_prog_data
->nr_params
= 0;
125 stage_prog_data
->nr_pull_params
= 0;
126 stage_prog_data
->curb_read_length
= 0;
127 stage_prog_data
->dispatch_grf_start_reg
= 2;
128 wm_prog_data
->dispatch_grf_start_reg_2
= 2;
129 grf_used
= 1; /* Gen4-5 don't allow zero GRF blocks */
134 /* The register location here is relative to the start of the URB
135 * data. It will get adjusted to be a real location before
136 * generate_code() time.
139 fs_visitor::interp_reg(int location
, int channel
)
141 assert(stage
== MESA_SHADER_FRAGMENT
);
142 struct brw_wm_prog_data
*prog_data
= brw_wm_prog_data(this->prog_data
);
143 int regnr
= prog_data
->urb_setup
[location
] * 2 + channel
/ 2;
144 int stride
= (channel
& 1) * 4;
146 assert(prog_data
->urb_setup
[location
] != -1);
148 return brw_vec1_grf(regnr
, stride
);
151 /** Emits the interpolation for the varying inputs. */
153 fs_visitor::emit_interpolation_setup_gen4()
155 struct brw_reg g1_uw
= retype(brw_vec1_grf(1, 0), BRW_REGISTER_TYPE_UW
);
157 fs_builder abld
= bld
.annotate("compute pixel centers");
158 this->pixel_x
= vgrf(glsl_type::uint_type
);
159 this->pixel_y
= vgrf(glsl_type::uint_type
);
160 this->pixel_x
.type
= BRW_REGISTER_TYPE_UW
;
161 this->pixel_y
.type
= BRW_REGISTER_TYPE_UW
;
162 abld
.ADD(this->pixel_x
,
163 fs_reg(stride(suboffset(g1_uw
, 4), 2, 4, 0)),
164 fs_reg(brw_imm_v(0x10101010)));
165 abld
.ADD(this->pixel_y
,
166 fs_reg(stride(suboffset(g1_uw
, 5), 2, 4, 0)),
167 fs_reg(brw_imm_v(0x11001100)));
169 abld
= bld
.annotate("compute pixel deltas from v0");
171 this->delta_xy
[BRW_BARYCENTRIC_PERSPECTIVE_PIXEL
] =
172 vgrf(glsl_type::vec2_type
);
173 const fs_reg
&delta_xy
= this->delta_xy
[BRW_BARYCENTRIC_PERSPECTIVE_PIXEL
];
174 const fs_reg
xstart(negate(brw_vec1_grf(1, 0)));
175 const fs_reg
ystart(negate(brw_vec1_grf(1, 1)));
177 if (devinfo
->has_pln
&& dispatch_width
== 16) {
178 for (unsigned i
= 0; i
< 2; i
++) {
179 abld
.half(i
).ADD(half(offset(delta_xy
, abld
, i
), 0),
180 half(this->pixel_x
, i
), xstart
);
181 abld
.half(i
).ADD(half(offset(delta_xy
, abld
, i
), 1),
182 half(this->pixel_y
, i
), ystart
);
185 abld
.ADD(offset(delta_xy
, abld
, 0), this->pixel_x
, xstart
);
186 abld
.ADD(offset(delta_xy
, abld
, 1), this->pixel_y
, ystart
);
189 abld
= bld
.annotate("compute pos.w and 1/pos.w");
190 /* Compute wpos.w. It's always in our setup, since it's needed to
191 * interpolate the other attributes.
193 this->wpos_w
= vgrf(glsl_type::float_type
);
194 abld
.emit(FS_OPCODE_LINTERP
, wpos_w
, delta_xy
,
195 interp_reg(VARYING_SLOT_POS
, 3));
196 /* Compute the pixel 1/W value from wpos.w. */
197 this->pixel_w
= vgrf(glsl_type::float_type
);
198 abld
.emit(SHADER_OPCODE_RCP
, this->pixel_w
, wpos_w
);
201 /** Emits the interpolation for the varying inputs. */
203 fs_visitor::emit_interpolation_setup_gen6()
205 struct brw_reg g1_uw
= retype(brw_vec1_grf(1, 0), BRW_REGISTER_TYPE_UW
);
207 fs_builder abld
= bld
.annotate("compute pixel centers");
208 if (devinfo
->gen
>= 8 || dispatch_width
== 8) {
209 /* The "Register Region Restrictions" page says for BDW (and newer,
212 * "When destination spans two registers, the source may be one or
213 * two registers. The destination elements must be evenly split
214 * between the two registers."
216 * Thus we can do a single add(16) in SIMD8 or an add(32) in SIMD16 to
217 * compute our pixel centers.
219 fs_reg
int_pixel_xy(VGRF
, alloc
.allocate(dispatch_width
/ 8),
220 BRW_REGISTER_TYPE_UW
);
222 const fs_builder dbld
= abld
.exec_all().group(dispatch_width
* 2, 0);
223 dbld
.ADD(int_pixel_xy
,
224 fs_reg(stride(suboffset(g1_uw
, 4), 1, 4, 0)),
225 fs_reg(brw_imm_v(0x11001010)));
227 this->pixel_x
= vgrf(glsl_type::float_type
);
228 this->pixel_y
= vgrf(glsl_type::float_type
);
229 abld
.emit(FS_OPCODE_PIXEL_X
, this->pixel_x
, int_pixel_xy
);
230 abld
.emit(FS_OPCODE_PIXEL_Y
, this->pixel_y
, int_pixel_xy
);
232 /* The "Register Region Restrictions" page says for SNB, IVB, HSW:
234 * "When destination spans two registers, the source MUST span two
237 * Since the GRF source of the ADD will only read a single register, we
238 * must do two separate ADDs in SIMD16.
240 fs_reg int_pixel_x
= vgrf(glsl_type::uint_type
);
241 fs_reg int_pixel_y
= vgrf(glsl_type::uint_type
);
242 int_pixel_x
.type
= BRW_REGISTER_TYPE_UW
;
243 int_pixel_y
.type
= BRW_REGISTER_TYPE_UW
;
244 abld
.ADD(int_pixel_x
,
245 fs_reg(stride(suboffset(g1_uw
, 4), 2, 4, 0)),
246 fs_reg(brw_imm_v(0x10101010)));
247 abld
.ADD(int_pixel_y
,
248 fs_reg(stride(suboffset(g1_uw
, 5), 2, 4, 0)),
249 fs_reg(brw_imm_v(0x11001100)));
251 /* As of gen6, we can no longer mix float and int sources. We have
252 * to turn the integer pixel centers into floats for their actual
255 this->pixel_x
= vgrf(glsl_type::float_type
);
256 this->pixel_y
= vgrf(glsl_type::float_type
);
257 abld
.MOV(this->pixel_x
, int_pixel_x
);
258 abld
.MOV(this->pixel_y
, int_pixel_y
);
261 abld
= bld
.annotate("compute pos.w");
262 this->pixel_w
= fs_reg(brw_vec8_grf(payload
.source_w_reg
, 0));
263 this->wpos_w
= vgrf(glsl_type::float_type
);
264 abld
.emit(SHADER_OPCODE_RCP
, this->wpos_w
, this->pixel_w
);
266 struct brw_wm_prog_data
*wm_prog_data
= brw_wm_prog_data(prog_data
);
267 uint32_t centroid_modes
= wm_prog_data
->barycentric_interp_modes
&
268 (1 << BRW_BARYCENTRIC_PERSPECTIVE_CENTROID
|
269 1 << BRW_BARYCENTRIC_NONPERSPECTIVE_CENTROID
);
271 for (int i
= 0; i
< BRW_BARYCENTRIC_MODE_COUNT
; ++i
) {
272 uint8_t reg
= payload
.barycentric_coord_reg
[i
];
273 this->delta_xy
[i
] = fs_reg(brw_vec16_grf(reg
, 0));
275 if (devinfo
->needs_unlit_centroid_workaround
&&
276 (centroid_modes
& (1 << i
))) {
277 /* Get the pixel/sample mask into f0 so that we know which
278 * pixels are lit. Then, for each channel that is unlit,
279 * replace the centroid data with non-centroid data.
281 bld
.emit(FS_OPCODE_MOV_DISPATCH_TO_FLAGS
);
283 uint8_t pixel_reg
= payload
.barycentric_coord_reg
[i
- 1];
285 set_predicate_inv(BRW_PREDICATE_NORMAL
, true,
286 bld
.half(0).MOV(brw_vec8_grf(reg
, 0),
287 brw_vec8_grf(pixel_reg
, 0)));
288 set_predicate_inv(BRW_PREDICATE_NORMAL
, true,
289 bld
.half(0).MOV(brw_vec8_grf(reg
+ 1, 0),
290 brw_vec8_grf(pixel_reg
+ 1, 0)));
291 if (dispatch_width
== 16) {
292 set_predicate_inv(BRW_PREDICATE_NORMAL
, true,
293 bld
.half(1).MOV(brw_vec8_grf(reg
+ 2, 0),
294 brw_vec8_grf(pixel_reg
+ 2, 0)));
295 set_predicate_inv(BRW_PREDICATE_NORMAL
, true,
296 bld
.half(1).MOV(brw_vec8_grf(reg
+ 3, 0),
297 brw_vec8_grf(pixel_reg
+ 3, 0)));
299 assert(dispatch_width
!= 32); /* not implemented yet */
304 static enum brw_conditional_mod
305 cond_for_alpha_func(GLenum func
)
309 return BRW_CONDITIONAL_G
;
311 return BRW_CONDITIONAL_GE
;
313 return BRW_CONDITIONAL_L
;
315 return BRW_CONDITIONAL_LE
;
317 return BRW_CONDITIONAL_EQ
;
319 return BRW_CONDITIONAL_NEQ
;
321 unreachable("Not reached");
326 * Alpha test support for when we compile it into the shader instead
327 * of using the normal fixed-function alpha test.
330 fs_visitor::emit_alpha_test()
332 assert(stage
== MESA_SHADER_FRAGMENT
);
333 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
334 const fs_builder abld
= bld
.annotate("Alpha test");
337 if (key
->alpha_test_func
== GL_ALWAYS
)
340 if (key
->alpha_test_func
== GL_NEVER
) {
342 fs_reg some_reg
= fs_reg(retype(brw_vec8_grf(0, 0),
343 BRW_REGISTER_TYPE_UW
));
344 cmp
= abld
.CMP(bld
.null_reg_f(), some_reg
, some_reg
,
345 BRW_CONDITIONAL_NEQ
);
348 fs_reg color
= offset(outputs
[0], bld
, 3);
350 /* f0.1 &= func(color, ref) */
351 cmp
= abld
.CMP(bld
.null_reg_f(), color
, brw_imm_f(key
->alpha_test_ref
),
352 cond_for_alpha_func(key
->alpha_test_func
));
354 cmp
->predicate
= BRW_PREDICATE_NORMAL
;
355 cmp
->flag_subreg
= 1;
359 fs_visitor::emit_single_fb_write(const fs_builder
&bld
,
360 fs_reg color0
, fs_reg color1
,
361 fs_reg src0_alpha
, unsigned components
)
363 assert(stage
== MESA_SHADER_FRAGMENT
);
364 struct brw_wm_prog_data
*prog_data
= brw_wm_prog_data(this->prog_data
);
366 /* Hand over gl_FragDepth or the payload depth. */
367 const fs_reg dst_depth
= (payload
.dest_depth_reg
?
368 fs_reg(brw_vec8_grf(payload
.dest_depth_reg
, 0)) :
370 fs_reg src_depth
, src_stencil
;
372 if (source_depth_to_render_target
) {
373 if (nir
->info
.outputs_written
& BITFIELD64_BIT(FRAG_RESULT_DEPTH
))
374 src_depth
= frag_depth
;
376 src_depth
= fs_reg(brw_vec8_grf(payload
.source_depth_reg
, 0));
379 if (nir
->info
.outputs_written
& BITFIELD64_BIT(FRAG_RESULT_STENCIL
))
380 src_stencil
= frag_stencil
;
382 const fs_reg sources
[] = {
383 color0
, color1
, src0_alpha
, src_depth
, dst_depth
, src_stencil
,
384 (prog_data
->uses_omask
? sample_mask
: fs_reg()),
385 brw_imm_ud(components
)
387 assert(ARRAY_SIZE(sources
) - 1 == FB_WRITE_LOGICAL_SRC_COMPONENTS
);
388 fs_inst
*write
= bld
.emit(FS_OPCODE_FB_WRITE_LOGICAL
, fs_reg(),
389 sources
, ARRAY_SIZE(sources
));
391 if (prog_data
->uses_kill
) {
392 write
->predicate
= BRW_PREDICATE_NORMAL
;
393 write
->flag_subreg
= 1;
400 fs_visitor::emit_fb_writes()
402 assert(stage
== MESA_SHADER_FRAGMENT
);
403 struct brw_wm_prog_data
*prog_data
= brw_wm_prog_data(this->prog_data
);
404 brw_wm_prog_key
*key
= (brw_wm_prog_key
*) this->key
;
406 fs_inst
*inst
= NULL
;
408 if (source_depth_to_render_target
&& devinfo
->gen
== 6) {
409 /* For outputting oDepth on gen6, SIMD8 writes have to be used. This
410 * would require SIMD8 moves of each half to message regs, e.g. by using
411 * the SIMD lowering pass. Unfortunately this is more difficult than it
412 * sounds because the SIMD8 single-source message lacks channel selects
413 * for the second and third subspans.
415 limit_dispatch_width(8, "Depth writes unsupported in SIMD16+ mode.\n");
418 if (nir
->info
.outputs_written
& BITFIELD64_BIT(FRAG_RESULT_STENCIL
)) {
419 /* From the 'Render Target Write message' section of the docs:
420 * "Output Stencil is not supported with SIMD16 Render Target Write
423 limit_dispatch_width(8, "gl_FragStencilRefARB unsupported "
424 "in SIMD16+ mode.\n");
427 for (int target
= 0; target
< key
->nr_color_regions
; target
++) {
428 /* Skip over outputs that weren't written. */
429 if (this->outputs
[target
].file
== BAD_FILE
)
432 const fs_builder abld
= bld
.annotate(
433 ralloc_asprintf(this->mem_ctx
, "FB write target %d", target
));
436 if (devinfo
->gen
>= 6 && key
->replicate_alpha
&& target
!= 0)
437 src0_alpha
= offset(outputs
[0], bld
, 3);
439 inst
= emit_single_fb_write(abld
, this->outputs
[target
],
440 this->dual_src_output
, src0_alpha
, 4);
441 inst
->target
= target
;
444 prog_data
->dual_src_blend
= (this->dual_src_output
.file
!= BAD_FILE
);
445 assert(!prog_data
->dual_src_blend
|| key
->nr_color_regions
== 1);
448 /* Even if there's no color buffers enabled, we still need to send
449 * alpha out the pipeline to our null renderbuffer to support
450 * alpha-testing, alpha-to-coverage, and so on.
452 /* FINISHME: Factor out this frequently recurring pattern into a
455 const fs_reg srcs
[] = { reg_undef
, reg_undef
,
456 reg_undef
, offset(this->outputs
[0], bld
, 3) };
457 const fs_reg tmp
= bld
.vgrf(BRW_REGISTER_TYPE_UD
, 4);
458 bld
.LOAD_PAYLOAD(tmp
, srcs
, 4, 0);
460 inst
= emit_single_fb_write(bld
, tmp
, reg_undef
, reg_undef
, 4);
468 fs_visitor::setup_uniform_clipplane_values(gl_clip_plane
*clip_planes
)
470 const struct brw_vs_prog_key
*key
=
471 (const struct brw_vs_prog_key
*) this->key
;
473 for (int i
= 0; i
< key
->nr_userclip_plane_consts
; i
++) {
474 this->userplane
[i
] = fs_reg(UNIFORM
, uniforms
);
475 for (int j
= 0; j
< 4; ++j
) {
476 stage_prog_data
->param
[uniforms
+ j
] =
477 (gl_constant_value
*) &clip_planes
[i
][j
];
484 * Lower legacy fixed-function and gl_ClipVertex clipping to clip distances.
486 * This does nothing if the shader uses gl_ClipDistance or user clipping is
487 * disabled altogether.
489 void fs_visitor::compute_clip_distance(gl_clip_plane
*clip_planes
)
491 struct brw_vue_prog_data
*vue_prog_data
= brw_vue_prog_data(prog_data
);
492 const struct brw_vs_prog_key
*key
=
493 (const struct brw_vs_prog_key
*) this->key
;
495 /* Bail unless some sort of legacy clipping is enabled */
496 if (key
->nr_userclip_plane_consts
== 0)
499 /* From the GLSL 1.30 spec, section 7.1 (Vertex Shader Special Variables):
501 * "If a linked set of shaders forming the vertex stage contains no
502 * static write to gl_ClipVertex or gl_ClipDistance, but the
503 * application has requested clipping against user clip planes through
504 * the API, then the coordinate written to gl_Position is used for
505 * comparison against the user clip planes."
507 * This function is only called if the shader didn't write to
508 * gl_ClipDistance. Accordingly, we use gl_ClipVertex to perform clipping
509 * if the user wrote to it; otherwise we use gl_Position.
512 gl_varying_slot clip_vertex
= VARYING_SLOT_CLIP_VERTEX
;
513 if (!(vue_prog_data
->vue_map
.slots_valid
& VARYING_BIT_CLIP_VERTEX
))
514 clip_vertex
= VARYING_SLOT_POS
;
516 /* If the clip vertex isn't written, skip this. Typically this means
517 * the GS will set up clipping. */
518 if (outputs
[clip_vertex
].file
== BAD_FILE
)
521 setup_uniform_clipplane_values(clip_planes
);
523 const fs_builder abld
= bld
.annotate("user clip distances");
525 this->outputs
[VARYING_SLOT_CLIP_DIST0
] = vgrf(glsl_type::vec4_type
);
526 this->outputs
[VARYING_SLOT_CLIP_DIST1
] = vgrf(glsl_type::vec4_type
);
528 for (int i
= 0; i
< key
->nr_userclip_plane_consts
; i
++) {
529 fs_reg u
= userplane
[i
];
530 const fs_reg output
= offset(outputs
[VARYING_SLOT_CLIP_DIST0
+ i
/ 4],
533 abld
.MUL(output
, outputs
[clip_vertex
], u
);
534 for (int j
= 1; j
< 4; j
++) {
535 u
.nr
= userplane
[i
].nr
+ j
;
536 abld
.MAD(output
, output
, offset(outputs
[clip_vertex
], bld
, j
), u
);
542 fs_visitor::emit_urb_writes(const fs_reg
&gs_vertex_count
)
544 int slot
, urb_offset
, length
;
545 int starting_urb_offset
= 0;
546 const struct brw_vue_prog_data
*vue_prog_data
=
547 brw_vue_prog_data(this->prog_data
);
548 const struct brw_vs_prog_key
*vs_key
=
549 (const struct brw_vs_prog_key
*) this->key
;
550 const GLbitfield64 psiz_mask
=
551 VARYING_BIT_LAYER
| VARYING_BIT_VIEWPORT
| VARYING_BIT_PSIZ
;
552 const struct brw_vue_map
*vue_map
= &vue_prog_data
->vue_map
;
557 if (stage
== MESA_SHADER_TESS_EVAL
)
558 urb_handle
= fs_reg(retype(brw_vec8_grf(4, 0), BRW_REGISTER_TYPE_UD
));
560 urb_handle
= fs_reg(retype(brw_vec8_grf(1, 0), BRW_REGISTER_TYPE_UD
));
562 /* If we don't have any valid slots to write, just do a minimal urb write
563 * send to terminate the shader. This includes 1 slot of undefined data,
564 * because it's invalid to write 0 data:
566 * From the Broadwell PRM, Volume 7: 3D Media GPGPU, Shared Functions -
567 * Unified Return Buffer (URB) > URB_SIMD8_Write and URB_SIMD8_Read >
568 * Write Data Payload:
570 * "The write data payload can be between 1 and 8 message phases long."
572 if (vue_map
->slots_valid
== 0) {
573 /* For GS, just turn EmitVertex() into a no-op. We don't want it to
574 * end the thread, and emit_gs_thread_end() already emits a SEND with
575 * EOT at the end of the program for us.
577 if (stage
== MESA_SHADER_GEOMETRY
)
580 fs_reg payload
= fs_reg(VGRF
, alloc
.allocate(2), BRW_REGISTER_TYPE_UD
);
581 bld
.exec_all().MOV(payload
, urb_handle
);
583 fs_inst
*inst
= bld
.emit(SHADER_OPCODE_URB_WRITE_SIMD8
, reg_undef
, payload
);
590 opcode opcode
= SHADER_OPCODE_URB_WRITE_SIMD8
;
592 fs_reg per_slot_offsets
;
594 if (stage
== MESA_SHADER_GEOMETRY
) {
595 const struct brw_gs_prog_data
*gs_prog_data
=
596 brw_gs_prog_data(this->prog_data
);
598 /* We need to increment the Global Offset to skip over the control data
599 * header and the extra "Vertex Count" field (1 HWord) at the beginning
600 * of the VUE. We're counting in OWords, so the units are doubled.
602 starting_urb_offset
= 2 * gs_prog_data
->control_data_header_size_hwords
;
603 if (gs_prog_data
->static_vertex_count
== -1)
604 starting_urb_offset
+= 2;
606 /* We also need to use per-slot offsets. The per-slot offset is the
607 * Vertex Count. SIMD8 mode processes 8 different primitives at a
608 * time; each may output a different number of vertices.
610 opcode
= SHADER_OPCODE_URB_WRITE_SIMD8_PER_SLOT
;
613 /* The URB offset is in 128-bit units, so we need to multiply by 2 */
614 const int output_vertex_size_owords
=
615 gs_prog_data
->output_vertex_size_hwords
* 2;
617 if (gs_vertex_count
.file
== IMM
) {
618 per_slot_offsets
= brw_imm_ud(output_vertex_size_owords
*
621 per_slot_offsets
= vgrf(glsl_type::int_type
);
622 bld
.MUL(per_slot_offsets
, gs_vertex_count
,
623 brw_imm_ud(output_vertex_size_owords
));
628 urb_offset
= starting_urb_offset
;
631 /* SSO shaders can have VUE slots allocated which are never actually
632 * written to, so ignore them when looking for the last (written) slot.
634 int last_slot
= vue_map
->num_slots
- 1;
635 while (last_slot
> 0 &&
636 (vue_map
->slot_to_varying
[last_slot
] == BRW_VARYING_SLOT_PAD
||
637 outputs
[vue_map
->slot_to_varying
[last_slot
]].file
== BAD_FILE
)) {
641 for (slot
= 0; slot
< vue_map
->num_slots
; slot
++) {
642 int varying
= vue_map
->slot_to_varying
[slot
];
644 case VARYING_SLOT_PSIZ
: {
645 /* The point size varying slot is the vue header and is always in the
646 * vue map. But often none of the special varyings that live there
647 * are written and in that case we can skip writing to the vue
648 * header, provided the corresponding state properly clamps the
649 * values further down the pipeline. */
650 if ((vue_map
->slots_valid
& psiz_mask
) == 0) {
656 fs_reg
zero(VGRF
, alloc
.allocate(1), BRW_REGISTER_TYPE_UD
);
657 bld
.MOV(zero
, brw_imm_ud(0u));
659 sources
[length
++] = zero
;
660 if (vue_map
->slots_valid
& VARYING_BIT_LAYER
)
661 sources
[length
++] = this->outputs
[VARYING_SLOT_LAYER
];
663 sources
[length
++] = zero
;
665 if (vue_map
->slots_valid
& VARYING_BIT_VIEWPORT
)
666 sources
[length
++] = this->outputs
[VARYING_SLOT_VIEWPORT
];
668 sources
[length
++] = zero
;
670 if (vue_map
->slots_valid
& VARYING_BIT_PSIZ
)
671 sources
[length
++] = this->outputs
[VARYING_SLOT_PSIZ
];
673 sources
[length
++] = zero
;
676 case BRW_VARYING_SLOT_NDC
:
677 case VARYING_SLOT_EDGE
:
678 unreachable("unexpected scalar vs output");
682 /* gl_Position is always in the vue map, but isn't always written by
683 * the shader. Other varyings (clip distances) get added to the vue
684 * map but don't always get written. In those cases, the
685 * corresponding this->output[] slot will be invalid we and can skip
686 * the urb write for the varying. If we've already queued up a vue
687 * slot for writing we flush a mlen 5 urb write, otherwise we just
688 * advance the urb_offset.
690 if (varying
== BRW_VARYING_SLOT_PAD
||
691 this->outputs
[varying
].file
== BAD_FILE
) {
699 if (stage
== MESA_SHADER_VERTEX
&& vs_key
->clamp_vertex_color
&&
700 (varying
== VARYING_SLOT_COL0
||
701 varying
== VARYING_SLOT_COL1
||
702 varying
== VARYING_SLOT_BFC0
||
703 varying
== VARYING_SLOT_BFC1
)) {
704 /* We need to clamp these guys, so do a saturating MOV into a
705 * temp register and use that for the payload.
707 for (int i
= 0; i
< 4; i
++) {
708 fs_reg reg
= fs_reg(VGRF
, alloc
.allocate(1), outputs
[varying
].type
);
709 fs_reg src
= offset(this->outputs
[varying
], bld
, i
);
710 set_saturate(true, bld
.MOV(reg
, src
));
711 sources
[length
++] = reg
;
714 for (unsigned i
= 0; i
< 4; i
++)
715 sources
[length
++] = offset(this->outputs
[varying
], bld
, i
);
720 const fs_builder abld
= bld
.annotate("URB write");
722 /* If we've queued up 8 registers of payload (2 VUE slots), if this is
723 * the last slot or if we need to flush (see BAD_FILE varying case
724 * above), emit a URB write send now to flush out the data.
726 if (length
== 8 || slot
== last_slot
)
729 fs_reg
*payload_sources
=
730 ralloc_array(mem_ctx
, fs_reg
, length
+ header_size
);
731 fs_reg payload
= fs_reg(VGRF
, alloc
.allocate(length
+ header_size
),
732 BRW_REGISTER_TYPE_F
);
733 payload_sources
[0] = urb_handle
;
735 if (opcode
== SHADER_OPCODE_URB_WRITE_SIMD8_PER_SLOT
)
736 payload_sources
[1] = per_slot_offsets
;
738 memcpy(&payload_sources
[header_size
], sources
,
739 length
* sizeof sources
[0]);
741 abld
.LOAD_PAYLOAD(payload
, payload_sources
, length
+ header_size
,
744 fs_inst
*inst
= abld
.emit(opcode
, reg_undef
, payload
);
745 inst
->eot
= slot
== last_slot
&& stage
!= MESA_SHADER_GEOMETRY
;
746 inst
->mlen
= length
+ header_size
;
747 inst
->offset
= urb_offset
;
748 urb_offset
= starting_urb_offset
+ slot
+ 1;
756 fs_visitor::emit_cs_terminate()
758 assert(devinfo
->gen
>= 7);
760 /* We are getting the thread ID from the compute shader header */
761 assert(stage
== MESA_SHADER_COMPUTE
);
763 /* We can't directly send from g0, since sends with EOT have to use
764 * g112-127. So, copy it to a virtual register, The register allocator will
765 * make sure it uses the appropriate register range.
767 struct brw_reg g0
= retype(brw_vec8_grf(0, 0), BRW_REGISTER_TYPE_UD
);
768 fs_reg payload
= fs_reg(VGRF
, alloc
.allocate(1), BRW_REGISTER_TYPE_UD
);
769 bld
.group(8, 0).exec_all().MOV(payload
, g0
);
771 /* Send a message to the thread spawner to terminate the thread. */
772 fs_inst
*inst
= bld
.exec_all()
773 .emit(CS_OPCODE_CS_TERMINATE
, reg_undef
, payload
);
778 fs_visitor::emit_barrier()
780 assert(devinfo
->gen
>= 7);
781 const uint32_t barrier_id_mask
=
782 devinfo
->gen
>= 9 ? 0x8f000000u
: 0x0f000000u
;
784 /* We are getting the barrier ID from the compute shader header */
785 assert(stage
== MESA_SHADER_COMPUTE
);
787 fs_reg payload
= fs_reg(VGRF
, alloc
.allocate(1), BRW_REGISTER_TYPE_UD
);
789 const fs_builder pbld
= bld
.exec_all().group(8, 0);
791 /* Clear the message payload */
792 pbld
.MOV(payload
, brw_imm_ud(0u));
794 /* Copy the barrier id from r0.2 to the message payload reg.2 */
795 fs_reg r0_2
= fs_reg(retype(brw_vec1_grf(0, 2), BRW_REGISTER_TYPE_UD
));
796 pbld
.AND(component(payload
, 2), r0_2
, brw_imm_ud(barrier_id_mask
));
798 /* Emit a gateway "barrier" message using the payload we set up, followed
799 * by a wait instruction.
801 bld
.exec_all().emit(SHADER_OPCODE_BARRIER
, reg_undef
, payload
);
804 fs_visitor::fs_visitor(const struct brw_compiler
*compiler
, void *log_data
,
807 struct brw_stage_prog_data
*prog_data
,
808 struct gl_program
*prog
,
809 const nir_shader
*shader
,
810 unsigned dispatch_width
,
811 int shader_time_index
,
812 const struct brw_vue_map
*input_vue_map
)
813 : backend_shader(compiler
, log_data
, mem_ctx
, shader
, prog_data
),
814 key(key
), gs_compile(NULL
), prog_data(prog_data
), prog(prog
),
815 input_vue_map(input_vue_map
),
816 dispatch_width(dispatch_width
),
817 shader_time_index(shader_time_index
),
818 bld(fs_builder(this, dispatch_width
).at_end())
823 fs_visitor::fs_visitor(const struct brw_compiler
*compiler
, void *log_data
,
825 struct brw_gs_compile
*c
,
826 struct brw_gs_prog_data
*prog_data
,
827 const nir_shader
*shader
,
828 int shader_time_index
)
829 : backend_shader(compiler
, log_data
, mem_ctx
, shader
,
830 &prog_data
->base
.base
),
831 key(&c
->key
), gs_compile(c
),
832 prog_data(&prog_data
->base
.base
), prog(NULL
),
834 shader_time_index(shader_time_index
),
835 bld(fs_builder(this, dispatch_width
).at_end())
845 case MESA_SHADER_FRAGMENT
:
846 key_tex
= &((const brw_wm_prog_key
*) key
)->tex
;
848 case MESA_SHADER_VERTEX
:
849 key_tex
= &((const brw_vs_prog_key
*) key
)->tex
;
851 case MESA_SHADER_TESS_CTRL
:
852 key_tex
= &((const brw_tcs_prog_key
*) key
)->tex
;
854 case MESA_SHADER_TESS_EVAL
:
855 key_tex
= &((const brw_tes_prog_key
*) key
)->tex
;
857 case MESA_SHADER_GEOMETRY
:
858 key_tex
= &((const brw_gs_prog_key
*) key
)->tex
;
860 case MESA_SHADER_COMPUTE
:
861 key_tex
= &((const brw_cs_prog_key
*) key
)->tex
;
864 unreachable("unhandled shader stage");
867 if (stage
== MESA_SHADER_COMPUTE
) {
868 const struct brw_cs_prog_data
*cs_prog_data
= brw_cs_prog_data(prog_data
);
869 unsigned size
= cs_prog_data
->local_size
[0] *
870 cs_prog_data
->local_size
[1] *
871 cs_prog_data
->local_size
[2];
872 size
= DIV_ROUND_UP(size
, devinfo
->max_cs_threads
);
873 min_dispatch_width
= size
> 16 ? 32 : (size
> 8 ? 16 : 8);
875 min_dispatch_width
= 8;
878 this->max_dispatch_width
= 32;
879 this->prog_data
= this->stage_prog_data
;
881 this->failed
= false;
883 this->nir_locals
= NULL
;
884 this->nir_ssa_values
= NULL
;
886 memset(&this->payload
, 0, sizeof(this->payload
));
887 this->source_depth_to_render_target
= false;
888 this->runtime_check_aads_emit
= false;
889 this->first_non_payload_grf
= 0;
890 this->max_grf
= devinfo
->gen
>= 7 ? GEN7_MRF_HACK_START
: BRW_MAX_GRF
;
892 this->virtual_grf_start
= NULL
;
893 this->virtual_grf_end
= NULL
;
894 this->live_intervals
= NULL
;
895 this->regs_live_at_ip
= NULL
;
898 this->last_scratch
= 0;
899 this->pull_constant_loc
= NULL
;
900 this->push_constant_loc
= NULL
;
902 this->promoted_constants
= 0,
904 this->spilled_any_registers
= false;
907 fs_visitor::~fs_visitor()