2 * Copyright © 2010 - 2015 Intel Corporation
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5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
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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
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20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
24 #ifndef BRW_COMPILER_H
25 #define BRW_COMPILER_H
28 #include "dev/gen_device_info.h"
29 #include "main/macros.h"
30 #include "main/mtypes.h"
31 #include "util/ralloc.h"
42 const struct gen_device_info
*devinfo
;
48 * Array of the ra classes for the unaligned contiguous register
54 * Mapping for register-allocated objects in *regs to the first
55 * GRF for that object.
57 uint8_t *ra_reg_to_grf
;
64 * Array of the ra classes for the unaligned contiguous register
65 * block sizes used, indexed by register size.
70 * Mapping from classes to ra_reg ranges. Each of the per-size
71 * classes corresponds to a range of ra_reg nodes. This array stores
72 * those ranges in the form of first ra_reg in each class and the
73 * total number of ra_reg elements in the last array element. This
74 * way the range of the i'th class is given by:
75 * [ class_to_ra_reg_range[i], class_to_ra_reg_range[i+1] )
77 int class_to_ra_reg_range
[17];
80 * Mapping for register-allocated objects in *regs to the first
81 * GRF for that object.
83 uint8_t *ra_reg_to_grf
;
86 * ra class for the aligned pairs we use for PLN, which doesn't
89 int aligned_pairs_class
;
92 void (*shader_debug_log
)(void *, const char *str
, ...) PRINTFLIKE(2, 3);
93 void (*shader_perf_log
)(void *, const char *str
, ...) PRINTFLIKE(2, 3);
95 bool scalar_stage
[MESA_SHADER_STAGES
];
96 struct gl_shader_compiler_options glsl_compiler_options
[MESA_SHADER_STAGES
];
99 * Apply workarounds for SIN and COS output range problems.
100 * This can negatively impact performance.
105 * Is 3DSTATE_CONSTANT_*'s Constant Buffer 0 relative to Dynamic State
106 * Base Address? (If not, it's a normal GPU address.)
108 bool constant_buffer_0_is_relative
;
111 * Whether or not the driver supports pull constants. If not, the compiler
112 * will attempt to push everything.
114 bool supports_pull_constants
;
117 * Whether or not the driver supports NIR shader constants. This controls
118 * whether nir_opt_large_constants will be run.
120 bool supports_shader_constants
;
124 * We use a constant subgroup size of 32. It really only needs to be a
125 * maximum and, since we do SIMD32 for compute shaders in some cases, it
126 * needs to be at least 32. SIMD8 and SIMD16 shaders will still claim a
127 * subgroup size of 32 but will act as if 16 or 24 of those channels are
130 #define BRW_SUBGROUP_SIZE 32
133 * Program key structures.
135 * When drawing, we look for the currently bound shaders in the program
136 * cache. This is essentially a hash table lookup, and these are the keys.
138 * Sometimes OpenGL features specified as state need to be simulated via
139 * shader code, due to a mismatch between the API and the hardware. This
140 * is often referred to as "non-orthagonal state" or "NOS". We store NOS
141 * in the program key so it's considered when searching for a program. If
142 * we haven't seen a particular combination before, we have to recompile a
143 * new specialized version.
145 * Shader compilation should not look up state in gl_context directly, but
146 * instead use the copy in the program key. This guarantees recompiles will
152 enum PACKED gen6_gather_sampler_wa
{
153 WA_SIGN
= 1, /* whether we need to sign extend */
154 WA_8BIT
= 2, /* if we have an 8bit format needing wa */
155 WA_16BIT
= 4, /* if we have a 16bit format needing wa */
159 * Sampler information needed by VS, WM, and GS program cache keys.
161 struct brw_sampler_prog_key_data
{
163 * EXT_texture_swizzle and DEPTH_TEXTURE_MODE swizzles.
165 uint16_t swizzles
[MAX_SAMPLERS
];
167 uint32_t gl_clamp_mask
[3];
170 * For RG32F, gather4's channel select is broken.
172 uint32_t gather_channel_quirk_mask
;
175 * Whether this sampler uses the compressed multisample surface layout.
177 uint32_t compressed_multisample_layout_mask
;
180 * Whether this sampler is using 16x multisampling. If so fetching from
181 * this sampler will be handled with a different instruction, ld2dms_w
187 * For Sandybridge, which shader w/a we need for gather quirks.
189 enum gen6_gather_sampler_wa gen6_gather_wa
[MAX_SAMPLERS
];
192 * Texture units that have a YUV image bound.
194 uint32_t y_u_v_image_mask
;
195 uint32_t y_uv_image_mask
;
196 uint32_t yx_xuxv_image_mask
;
197 uint32_t xy_uxvx_image_mask
;
198 uint32_t ayuv_image_mask
;
199 uint32_t xyuv_image_mask
;
201 /* Scale factor for each texture. */
202 float scale_factors
[32];
206 * The VF can't natively handle certain types of attributes, such as GL_FIXED
207 * or most 10_10_10_2 types. These flags enable various VS workarounds to
208 * "fix" attributes at the beginning of shaders.
210 #define BRW_ATTRIB_WA_COMPONENT_MASK 7 /* mask for GL_FIXED scale channel count */
211 #define BRW_ATTRIB_WA_NORMALIZE 8 /* normalize in shader */
212 #define BRW_ATTRIB_WA_BGRA 16 /* swap r/b channels in shader */
213 #define BRW_ATTRIB_WA_SIGN 32 /* interpret as signed in shader */
214 #define BRW_ATTRIB_WA_SCALE 64 /* interpret as scaled in shader */
217 * OpenGL attribute slots fall in [0, VERT_ATTRIB_MAX - 1] with the range
218 * [VERT_ATTRIB_GENERIC0, VERT_ATTRIB_MAX - 1] reserved for up to 16 user
219 * input vertex attributes. In Vulkan, we expose up to 28 user vertex input
220 * attributes that are mapped to slots also starting at VERT_ATTRIB_GENERIC0.
222 #define MAX_GL_VERT_ATTRIB VERT_ATTRIB_MAX
223 #define MAX_VK_VERT_ATTRIB (VERT_ATTRIB_GENERIC0 + 28)
225 /** The program key for Vertex Shaders. */
226 struct brw_vs_prog_key
{
227 unsigned program_string_id
;
230 * Per-attribute workaround flags
232 * For each attribute, a combination of BRW_ATTRIB_WA_*.
234 * For OpenGL, where we expose a maximum of 16 user input atttributes
235 * we only need up to VERT_ATTRIB_MAX slots, however, in Vulkan
236 * slots preceding VERT_ATTRIB_GENERIC0 are unused and we can
237 * expose up to 28 user input vertex attributes that are mapped to slots
238 * starting at VERT_ATTRIB_GENERIC0, so this array needs to be large
239 * enough to hold this many slots.
241 uint8_t gl_attrib_wa_flags
[MAX2(MAX_GL_VERT_ATTRIB
, MAX_VK_VERT_ATTRIB
)];
243 bool copy_edgeflag
:1;
245 bool clamp_vertex_color
:1;
248 * How many user clipping planes are being uploaded to the vertex shader as
251 * These are used for lowering legacy gl_ClipVertex/gl_Position clipping to
254 unsigned nr_userclip_plane_consts
:4;
257 * For pre-Gen6 hardware, a bitfield indicating which texture coordinates
258 * are going to be replaced with point coordinates (as a consequence of a
259 * call to glTexEnvi(GL_POINT_SPRITE, GL_COORD_REPLACE, GL_TRUE)). Because
260 * our SF thread requires exact matching between VS outputs and FS inputs,
261 * these texture coordinates will need to be unconditionally included in
262 * the VUE, even if they aren't written by the vertex shader.
264 uint8_t point_coord_replace
;
266 struct brw_sampler_prog_key_data tex
;
269 /** The program key for Tessellation Control Shaders. */
270 struct brw_tcs_prog_key
272 unsigned program_string_id
;
274 GLenum tes_primitive_mode
;
276 unsigned input_vertices
;
278 /** A bitfield of per-patch outputs written. */
279 uint32_t patch_outputs_written
;
281 /** A bitfield of per-vertex outputs written. */
282 uint64_t outputs_written
;
284 bool quads_workaround
;
286 struct brw_sampler_prog_key_data tex
;
289 /** The program key for Tessellation Evaluation Shaders. */
290 struct brw_tes_prog_key
292 unsigned program_string_id
;
294 /** A bitfield of per-patch inputs read. */
295 uint32_t patch_inputs_read
;
297 /** A bitfield of per-vertex inputs read. */
298 uint64_t inputs_read
;
300 struct brw_sampler_prog_key_data tex
;
303 /** The program key for Geometry Shaders. */
304 struct brw_gs_prog_key
306 unsigned program_string_id
;
308 struct brw_sampler_prog_key_data tex
;
311 enum brw_sf_primitive
{
312 BRW_SF_PRIM_POINTS
= 0,
313 BRW_SF_PRIM_LINES
= 1,
314 BRW_SF_PRIM_TRIANGLES
= 2,
315 BRW_SF_PRIM_UNFILLED_TRIS
= 3,
318 struct brw_sf_prog_key
{
320 bool contains_flat_varying
;
321 unsigned char interp_mode
[65]; /* BRW_VARYING_SLOT_COUNT */
322 uint8_t point_sprite_coord_replace
;
323 enum brw_sf_primitive primitive
:2;
324 bool do_twoside_color
:1;
325 bool frontface_ccw
:1;
326 bool do_point_sprite
:1;
327 bool do_point_coord
:1;
328 bool sprite_origin_lower_left
:1;
329 bool userclip_active
:1;
333 BRW_CLIP_MODE_NORMAL
= 0,
334 BRW_CLIP_MODE_CLIP_ALL
= 1,
335 BRW_CLIP_MODE_CLIP_NON_REJECTED
= 2,
336 BRW_CLIP_MODE_REJECT_ALL
= 3,
337 BRW_CLIP_MODE_ACCEPT_ALL
= 4,
338 BRW_CLIP_MODE_KERNEL_CLIP
= 5,
341 enum brw_clip_fill_mode
{
342 BRW_CLIP_FILL_MODE_LINE
= 0,
343 BRW_CLIP_FILL_MODE_POINT
= 1,
344 BRW_CLIP_FILL_MODE_FILL
= 2,
345 BRW_CLIP_FILL_MODE_CULL
= 3,
348 /* Note that if unfilled primitives are being emitted, we have to fix
349 * up polygon offset and flatshading at this point:
351 struct brw_clip_prog_key
{
353 bool contains_flat_varying
;
354 bool contains_noperspective_varying
;
355 unsigned char interp_mode
[65]; /* BRW_VARYING_SLOT_COUNT */
356 unsigned primitive
:4;
357 unsigned nr_userclip
:4;
360 enum brw_clip_fill_mode fill_cw
:2; /* includes cull information */
361 enum brw_clip_fill_mode fill_ccw
:2; /* includes cull information */
366 enum brw_clip_mode clip_mode
:3;
373 /* A big lookup table is used to figure out which and how many
374 * additional regs will inserted before the main payload in the WM
375 * program execution. These mainly relate to depth and stencil
376 * processing and the early-depth-test optimization.
378 enum brw_wm_iz_bits
{
379 BRW_WM_IZ_PS_KILL_ALPHATEST_BIT
= 0x1,
380 BRW_WM_IZ_PS_COMPUTES_DEPTH_BIT
= 0x2,
381 BRW_WM_IZ_DEPTH_WRITE_ENABLE_BIT
= 0x4,
382 BRW_WM_IZ_DEPTH_TEST_ENABLE_BIT
= 0x8,
383 BRW_WM_IZ_STENCIL_WRITE_ENABLE_BIT
= 0x10,
384 BRW_WM_IZ_STENCIL_TEST_ENABLE_BIT
= 0x20,
385 BRW_WM_IZ_BIT_MAX
= 0x40
388 enum brw_wm_aa_enable
{
394 /** The program key for Fragment/Pixel Shaders. */
395 struct brw_wm_prog_key
{
396 /* Some collection of BRW_WM_IZ_* */
400 unsigned nr_color_regions
:5;
401 bool alpha_test_replicate_alpha
:1;
402 bool alpha_to_coverage
:1;
403 bool clamp_fragment_color
:1;
404 bool persample_interp
:1;
405 bool multisample_fbo
:1;
406 bool frag_coord_adds_sample_pos
:1;
407 enum brw_wm_aa_enable line_aa
:2;
408 bool high_quality_derivatives
:1;
409 bool force_dual_color_blend
:1;
410 bool coherent_fb_fetch
:1;
412 uint8_t color_outputs_valid
;
413 uint64_t input_slots_valid
;
414 unsigned program_string_id
;
415 GLenum alpha_test_func
; /* < For Gen4/5 MRT alpha test */
416 float alpha_test_ref
;
418 struct brw_sampler_prog_key_data tex
;
421 struct brw_cs_prog_key
{
422 uint32_t program_string_id
;
423 struct brw_sampler_prog_key_data tex
;
426 /* brw_any_prog_key is any of the keys that map to an API stage */
427 union brw_any_prog_key
{
428 struct brw_vs_prog_key vs
;
429 struct brw_tcs_prog_key tcs
;
430 struct brw_tes_prog_key tes
;
431 struct brw_gs_prog_key gs
;
432 struct brw_wm_prog_key wm
;
433 struct brw_cs_prog_key cs
;
437 * Image metadata structure as laid out in the shader parameter
438 * buffer. Entries have to be 16B-aligned for the vec4 back-end to be
439 * able to use them. That's okay because the padding and any unused
440 * entries [most of them except when we're doing untyped surface
441 * access] will be removed by the uniform packing pass.
443 #define BRW_IMAGE_PARAM_OFFSET_OFFSET 0
444 #define BRW_IMAGE_PARAM_SIZE_OFFSET 4
445 #define BRW_IMAGE_PARAM_STRIDE_OFFSET 8
446 #define BRW_IMAGE_PARAM_TILING_OFFSET 12
447 #define BRW_IMAGE_PARAM_SWIZZLING_OFFSET 16
448 #define BRW_IMAGE_PARAM_SIZE 20
450 struct brw_image_param
{
451 /** Offset applied to the X and Y surface coordinates. */
454 /** Surface X, Y and Z dimensions. */
457 /** X-stride in bytes, Y-stride in pixels, horizontal slice stride in
458 * pixels, vertical slice stride in pixels.
462 /** Log2 of the tiling modulus in the X, Y and Z dimension. */
466 * Right shift to apply for bit 6 address swizzling. Two different
467 * swizzles can be specified and will be applied one after the other. The
468 * resulting address will be:
470 * addr' = addr ^ ((1 << 6) & ((addr >> swizzling[0]) ^
471 * (addr >> swizzling[1])))
473 * Use \c 0xff if any of the swizzles is not required.
475 uint32_t swizzling
[2];
478 /** Max number of render targets in a shader */
479 #define BRW_MAX_DRAW_BUFFERS 8
482 * Max number of binding table entries used for stream output.
484 * From the OpenGL 3.0 spec, table 6.44 (Transform Feedback State), the
485 * minimum value of MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS is 64.
487 * On Gen6, the size of transform feedback data is limited not by the number
488 * of components but by the number of binding table entries we set aside. We
489 * use one binding table entry for a float, one entry for a vector, and one
490 * entry per matrix column. Since the only way we can communicate our
491 * transform feedback capabilities to the client is via
492 * MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS, we need to plan for the
493 * worst case, in which all the varyings are floats, so we use up one binding
494 * table entry per component. Therefore we need to set aside at least 64
495 * binding table entries for use by transform feedback.
497 * Note: since we don't currently pack varyings, it is currently impossible
498 * for the client to actually use up all of these binding table entries--if
499 * all of their varyings were floats, they would run out of varying slots and
500 * fail to link. But that's a bug, so it seems prudent to go ahead and
501 * allocate the number of binding table entries we will need once the bug is
504 #define BRW_MAX_SOL_BINDINGS 64
507 * Binding table index for the first gen6 SOL binding.
509 #define BRW_GEN6_SOL_BINDING_START 0
512 * Stride in bytes between shader_time entries.
514 * We separate entries by a cacheline to reduce traffic between EUs writing to
517 #define BRW_SHADER_TIME_STRIDE 64
526 /* We reserve the first 2^16 values for builtins */
527 #define BRW_PARAM_IS_BUILTIN(param) (((param) & 0xffff0000) == 0)
529 enum brw_param_builtin
{
530 BRW_PARAM_BUILTIN_ZERO
,
532 BRW_PARAM_BUILTIN_CLIP_PLANE_0_X
,
533 BRW_PARAM_BUILTIN_CLIP_PLANE_0_Y
,
534 BRW_PARAM_BUILTIN_CLIP_PLANE_0_Z
,
535 BRW_PARAM_BUILTIN_CLIP_PLANE_0_W
,
536 BRW_PARAM_BUILTIN_CLIP_PLANE_1_X
,
537 BRW_PARAM_BUILTIN_CLIP_PLANE_1_Y
,
538 BRW_PARAM_BUILTIN_CLIP_PLANE_1_Z
,
539 BRW_PARAM_BUILTIN_CLIP_PLANE_1_W
,
540 BRW_PARAM_BUILTIN_CLIP_PLANE_2_X
,
541 BRW_PARAM_BUILTIN_CLIP_PLANE_2_Y
,
542 BRW_PARAM_BUILTIN_CLIP_PLANE_2_Z
,
543 BRW_PARAM_BUILTIN_CLIP_PLANE_2_W
,
544 BRW_PARAM_BUILTIN_CLIP_PLANE_3_X
,
545 BRW_PARAM_BUILTIN_CLIP_PLANE_3_Y
,
546 BRW_PARAM_BUILTIN_CLIP_PLANE_3_Z
,
547 BRW_PARAM_BUILTIN_CLIP_PLANE_3_W
,
548 BRW_PARAM_BUILTIN_CLIP_PLANE_4_X
,
549 BRW_PARAM_BUILTIN_CLIP_PLANE_4_Y
,
550 BRW_PARAM_BUILTIN_CLIP_PLANE_4_Z
,
551 BRW_PARAM_BUILTIN_CLIP_PLANE_4_W
,
552 BRW_PARAM_BUILTIN_CLIP_PLANE_5_X
,
553 BRW_PARAM_BUILTIN_CLIP_PLANE_5_Y
,
554 BRW_PARAM_BUILTIN_CLIP_PLANE_5_Z
,
555 BRW_PARAM_BUILTIN_CLIP_PLANE_5_W
,
556 BRW_PARAM_BUILTIN_CLIP_PLANE_6_X
,
557 BRW_PARAM_BUILTIN_CLIP_PLANE_6_Y
,
558 BRW_PARAM_BUILTIN_CLIP_PLANE_6_Z
,
559 BRW_PARAM_BUILTIN_CLIP_PLANE_6_W
,
560 BRW_PARAM_BUILTIN_CLIP_PLANE_7_X
,
561 BRW_PARAM_BUILTIN_CLIP_PLANE_7_Y
,
562 BRW_PARAM_BUILTIN_CLIP_PLANE_7_Z
,
563 BRW_PARAM_BUILTIN_CLIP_PLANE_7_W
,
565 BRW_PARAM_BUILTIN_TESS_LEVEL_OUTER_X
,
566 BRW_PARAM_BUILTIN_TESS_LEVEL_OUTER_Y
,
567 BRW_PARAM_BUILTIN_TESS_LEVEL_OUTER_Z
,
568 BRW_PARAM_BUILTIN_TESS_LEVEL_OUTER_W
,
569 BRW_PARAM_BUILTIN_TESS_LEVEL_INNER_X
,
570 BRW_PARAM_BUILTIN_TESS_LEVEL_INNER_Y
,
572 BRW_PARAM_BUILTIN_PATCH_VERTICES_IN
,
574 BRW_PARAM_BUILTIN_BASE_WORK_GROUP_ID_X
,
575 BRW_PARAM_BUILTIN_BASE_WORK_GROUP_ID_Y
,
576 BRW_PARAM_BUILTIN_BASE_WORK_GROUP_ID_Z
,
577 BRW_PARAM_BUILTIN_SUBGROUP_ID
,
580 #define BRW_PARAM_BUILTIN_CLIP_PLANE(idx, comp) \
581 (BRW_PARAM_BUILTIN_CLIP_PLANE_0_X + ((idx) << 2) + (comp))
583 #define BRW_PARAM_BUILTIN_IS_CLIP_PLANE(param) \
584 ((param) >= BRW_PARAM_BUILTIN_CLIP_PLANE_0_X && \
585 (param) <= BRW_PARAM_BUILTIN_CLIP_PLANE_7_W)
587 #define BRW_PARAM_BUILTIN_CLIP_PLANE_IDX(param) \
588 (((param) - BRW_PARAM_BUILTIN_CLIP_PLANE_0_X) >> 2)
590 #define BRW_PARAM_BUILTIN_CLIP_PLANE_COMP(param) \
591 (((param) - BRW_PARAM_BUILTIN_CLIP_PLANE_0_X) & 0x3)
593 struct brw_stage_prog_data
{
595 /** size of our binding table. */
599 * surface indices for the various groups of surfaces
601 uint32_t pull_constants_start
;
602 uint32_t texture_start
;
603 uint32_t gather_texture_start
;
606 uint32_t image_start
;
607 uint32_t shader_time_start
;
608 uint32_t plane_start
[3];
612 struct brw_ubo_range ubo_ranges
[4];
614 GLuint nr_params
; /**< number of float params/constants */
615 GLuint nr_pull_params
;
617 unsigned curb_read_length
;
618 unsigned total_scratch
;
619 unsigned total_shared
;
621 unsigned program_size
;
624 * Register where the thread expects to find input data from the URB
625 * (typically uniforms, followed by vertex or fragment attributes).
627 unsigned dispatch_grf_start_reg
;
629 bool use_alt_mode
; /**< Use ALT floating point mode? Otherwise, IEEE. */
631 /* 32-bit identifiers for all push/pull parameters. These can be anything
632 * the driver wishes them to be; the core of the back-end compiler simply
633 * re-arranges them. The one restriction is that the bottom 2^16 values
634 * are reserved for builtins defined in the brw_param_builtin enum defined
638 uint32_t *pull_param
;
641 static inline uint32_t *
642 brw_stage_prog_data_add_params(struct brw_stage_prog_data
*prog_data
,
643 unsigned nr_new_params
)
645 unsigned old_nr_params
= prog_data
->nr_params
;
646 prog_data
->nr_params
+= nr_new_params
;
647 prog_data
->param
= reralloc(ralloc_parent(prog_data
->param
),
648 prog_data
->param
, uint32_t,
649 prog_data
->nr_params
);
650 return prog_data
->param
+ old_nr_params
;
653 enum brw_barycentric_mode
{
654 BRW_BARYCENTRIC_PERSPECTIVE_PIXEL
= 0,
655 BRW_BARYCENTRIC_PERSPECTIVE_CENTROID
= 1,
656 BRW_BARYCENTRIC_PERSPECTIVE_SAMPLE
= 2,
657 BRW_BARYCENTRIC_NONPERSPECTIVE_PIXEL
= 3,
658 BRW_BARYCENTRIC_NONPERSPECTIVE_CENTROID
= 4,
659 BRW_BARYCENTRIC_NONPERSPECTIVE_SAMPLE
= 5,
660 BRW_BARYCENTRIC_MODE_COUNT
= 6
662 #define BRW_BARYCENTRIC_NONPERSPECTIVE_BITS \
663 ((1 << BRW_BARYCENTRIC_NONPERSPECTIVE_PIXEL) | \
664 (1 << BRW_BARYCENTRIC_NONPERSPECTIVE_CENTROID) | \
665 (1 << BRW_BARYCENTRIC_NONPERSPECTIVE_SAMPLE))
667 enum brw_pixel_shader_computed_depth_mode
{
668 BRW_PSCDEPTH_OFF
= 0, /* PS does not compute depth */
669 BRW_PSCDEPTH_ON
= 1, /* PS computes depth; no guarantee about value */
670 BRW_PSCDEPTH_ON_GE
= 2, /* PS guarantees output depth >= source depth */
671 BRW_PSCDEPTH_ON_LE
= 3, /* PS guarantees output depth <= source depth */
674 /* Data about a particular attempt to compile a program. Note that
675 * there can be many of these, each in a different GL state
676 * corresponding to a different brw_wm_prog_key struct, with different
679 struct brw_wm_prog_data
{
680 struct brw_stage_prog_data base
;
682 GLuint num_varying_inputs
;
684 uint8_t reg_blocks_8
;
685 uint8_t reg_blocks_16
;
686 uint8_t reg_blocks_32
;
688 uint8_t dispatch_grf_start_reg_16
;
689 uint8_t dispatch_grf_start_reg_32
;
690 uint32_t prog_offset_16
;
691 uint32_t prog_offset_32
;
695 * surface indices the WM-specific surfaces
697 uint32_t render_target_read_start
;
701 uint8_t computed_depth_mode
;
702 bool computed_stencil
;
704 bool early_fragment_tests
;
705 bool post_depth_coverage
;
711 bool replicate_alpha
;
712 bool persample_dispatch
;
713 bool uses_pos_offset
;
718 bool uses_sample_mask
;
719 bool has_render_target_reads
;
720 bool has_side_effects
;
723 bool contains_flat_varying
;
724 bool contains_noperspective_varying
;
727 * Mask of which interpolation modes are required by the fragment shader.
728 * Used in hardware setup on gen6+.
730 uint32_t barycentric_interp_modes
;
733 * Mask of which FS inputs are marked flat by the shader source. This is
734 * needed for setting up 3DSTATE_SF/SBE.
736 uint32_t flat_inputs
;
738 /* Mapping of VUE slots to interpolation modes.
739 * Used by the Gen4-5 clip/sf/wm stages.
741 unsigned char interp_mode
[65]; /* BRW_VARYING_SLOT_COUNT */
744 * Map from gl_varying_slot to the position within the FS setup data
745 * payload where the varying's attribute vertex deltas should be delivered.
746 * For varying slots that are not used by the FS, the value is -1.
748 int urb_setup
[VARYING_SLOT_MAX
];
751 /** Returns the SIMD width corresponding to a given KSP index
753 * The "Variable Pixel Dispatch" table in the PRM (which can be found, for
754 * example in Vol. 7 of the SKL PRM) has a mapping from dispatch widths to
755 * kernel start pointer (KSP) indices that is based on what dispatch widths
756 * are enabled. This function provides, effectively, the reverse mapping.
758 * If the given KSP is valid with respect to the SIMD8/16/32 enables, a SIMD
759 * width of 8, 16, or 32 is returned. If the KSP is invalid, 0 is returned.
761 static inline unsigned
762 brw_fs_simd_width_for_ksp(unsigned ksp_idx
, bool simd8_enabled
,
763 bool simd16_enabled
, bool simd32_enabled
)
765 /* This function strictly ignores contiguous dispatch */
768 return simd8_enabled
? 8 :
769 (simd16_enabled
&& !simd32_enabled
) ? 16 :
770 (simd32_enabled
&& !simd16_enabled
) ? 32 : 0;
772 return (simd32_enabled
&& (simd16_enabled
|| simd8_enabled
)) ? 32 : 0;
774 return (simd16_enabled
&& (simd32_enabled
|| simd8_enabled
)) ? 16 : 0;
776 unreachable("Invalid KSP index");
780 #define brw_wm_state_simd_width_for_ksp(wm_state, ksp_idx) \
781 brw_fs_simd_width_for_ksp((ksp_idx), (wm_state)._8PixelDispatchEnable, \
782 (wm_state)._16PixelDispatchEnable, \
783 (wm_state)._32PixelDispatchEnable)
785 #define brw_wm_state_has_ksp(wm_state, ksp_idx) \
786 (brw_wm_state_simd_width_for_ksp((wm_state), (ksp_idx)) != 0)
788 static inline uint32_t
789 _brw_wm_prog_data_prog_offset(const struct brw_wm_prog_data
*prog_data
,
792 switch (simd_width
) {
794 case 16: return prog_data
->prog_offset_16
;
795 case 32: return prog_data
->prog_offset_32
;
800 #define brw_wm_prog_data_prog_offset(prog_data, wm_state, ksp_idx) \
801 _brw_wm_prog_data_prog_offset(prog_data, \
802 brw_wm_state_simd_width_for_ksp(wm_state, ksp_idx))
804 static inline uint8_t
805 _brw_wm_prog_data_dispatch_grf_start_reg(const struct brw_wm_prog_data
*prog_data
,
808 switch (simd_width
) {
809 case 8: return prog_data
->base
.dispatch_grf_start_reg
;
810 case 16: return prog_data
->dispatch_grf_start_reg_16
;
811 case 32: return prog_data
->dispatch_grf_start_reg_32
;
816 #define brw_wm_prog_data_dispatch_grf_start_reg(prog_data, wm_state, ksp_idx) \
817 _brw_wm_prog_data_dispatch_grf_start_reg(prog_data, \
818 brw_wm_state_simd_width_for_ksp(wm_state, ksp_idx))
820 static inline uint8_t
821 _brw_wm_prog_data_reg_blocks(const struct brw_wm_prog_data
*prog_data
,
824 switch (simd_width
) {
825 case 8: return prog_data
->reg_blocks_8
;
826 case 16: return prog_data
->reg_blocks_16
;
827 case 32: return prog_data
->reg_blocks_32
;
832 #define brw_wm_prog_data_reg_blocks(prog_data, wm_state, ksp_idx) \
833 _brw_wm_prog_data_reg_blocks(prog_data, \
834 brw_wm_state_simd_width_for_ksp(wm_state, ksp_idx))
836 struct brw_push_const_block
{
837 unsigned dwords
; /* Dword count, not reg aligned */
839 unsigned size
; /* Bytes, register aligned */
842 struct brw_cs_prog_data
{
843 struct brw_stage_prog_data base
;
845 unsigned local_size
[3];
849 bool uses_num_work_groups
;
852 struct brw_push_const_block cross_thread
;
853 struct brw_push_const_block per_thread
;
854 struct brw_push_const_block total
;
859 * surface indices the CS-specific surfaces
861 uint32_t work_groups_start
;
867 * Enum representing the i965-specific vertex results that don't correspond
868 * exactly to any element of gl_varying_slot. The values of this enum are
869 * assigned such that they don't conflict with gl_varying_slot.
873 BRW_VARYING_SLOT_NDC
= VARYING_SLOT_MAX
,
874 BRW_VARYING_SLOT_PAD
,
876 * Technically this is not a varying but just a placeholder that
877 * compile_sf_prog() inserts into its VUE map to cause the gl_PointCoord
878 * builtin variable to be compiled correctly. see compile_sf_prog() for
881 BRW_VARYING_SLOT_PNTC
,
882 BRW_VARYING_SLOT_COUNT
886 * We always program SF to start reading at an offset of 1 (2 varying slots)
887 * from the start of the vertex URB entry. This causes it to skip:
888 * - VARYING_SLOT_PSIZ and BRW_VARYING_SLOT_NDC on gen4-5
889 * - VARYING_SLOT_PSIZ and VARYING_SLOT_POS on gen6+
891 #define BRW_SF_URB_ENTRY_READ_OFFSET 1
894 * Bitmask indicating which fragment shader inputs represent varyings (and
895 * hence have to be delivered to the fragment shader by the SF/SBE stage).
897 #define BRW_FS_VARYING_INPUT_MASK \
898 (BITFIELD64_RANGE(0, VARYING_SLOT_MAX) & \
899 ~VARYING_BIT_POS & ~VARYING_BIT_FACE)
902 * Data structure recording the relationship between the gl_varying_slot enum
903 * and "slots" within the vertex URB entry (VUE). A "slot" is defined as a
904 * single octaword within the VUE (128 bits).
906 * Note that each BRW register contains 256 bits (2 octawords), so when
907 * accessing the VUE in URB_NOSWIZZLE mode, each register corresponds to two
908 * consecutive VUE slots. When accessing the VUE in URB_INTERLEAVED mode (as
909 * in a vertex shader), each register corresponds to a single VUE slot, since
910 * it contains data for two separate vertices.
914 * Bitfield representing all varying slots that are (a) stored in this VUE
915 * map, and (b) actually written by the shader. Does not include any of
916 * the additional varying slots defined in brw_varying_slot.
918 uint64_t slots_valid
;
921 * Is this VUE map for a separate shader pipeline?
923 * Separable programs (GL_ARB_separate_shader_objects) can be mixed and matched
924 * without the linker having a chance to dead code eliminate unused varyings.
926 * This means that we have to use a fixed slot layout, based on the output's
927 * location field, rather than assigning slots in a compact contiguous block.
932 * Map from gl_varying_slot value to VUE slot. For gl_varying_slots that are
933 * not stored in a slot (because they are not written, or because
934 * additional processing is applied before storing them in the VUE), the
937 signed char varying_to_slot
[VARYING_SLOT_TESS_MAX
];
940 * Map from VUE slot to gl_varying_slot value. For slots that do not
941 * directly correspond to a gl_varying_slot, the value comes from
944 * For slots that are not in use, the value is BRW_VARYING_SLOT_PAD.
946 signed char slot_to_varying
[VARYING_SLOT_TESS_MAX
];
949 * Total number of VUE slots in use
954 * Number of per-patch VUE slots. Only valid for tessellation control
955 * shader outputs and tessellation evaluation shader inputs.
957 int num_per_patch_slots
;
960 * Number of per-vertex VUE slots. Only valid for tessellation control
961 * shader outputs and tessellation evaluation shader inputs.
963 int num_per_vertex_slots
;
966 void brw_print_vue_map(FILE *fp
, const struct brw_vue_map
*vue_map
);
969 * Convert a VUE slot number into a byte offset within the VUE.
971 static inline GLuint
brw_vue_slot_to_offset(GLuint slot
)
977 * Convert a vertex output (brw_varying_slot) into a byte offset within the
981 GLuint
brw_varying_to_offset(const struct brw_vue_map
*vue_map
, GLuint varying
)
983 return brw_vue_slot_to_offset(vue_map
->varying_to_slot
[varying
]);
986 void brw_compute_vue_map(const struct gen_device_info
*devinfo
,
987 struct brw_vue_map
*vue_map
,
988 uint64_t slots_valid
,
989 bool separate_shader
);
991 void brw_compute_tess_vue_map(struct brw_vue_map
*const vue_map
,
992 uint64_t slots_valid
,
995 /* brw_interpolation_map.c */
996 void brw_setup_vue_interpolation(struct brw_vue_map
*vue_map
,
997 struct nir_shader
*nir
,
998 struct brw_wm_prog_data
*prog_data
);
1000 enum shader_dispatch_mode
{
1001 DISPATCH_MODE_4X1_SINGLE
= 0,
1002 DISPATCH_MODE_4X2_DUAL_INSTANCE
= 1,
1003 DISPATCH_MODE_4X2_DUAL_OBJECT
= 2,
1004 DISPATCH_MODE_SIMD8
= 3,
1008 * @defgroup Tessellator parameter enumerations.
1010 * These correspond to the hardware values in 3DSTATE_TE, and are provided
1011 * as part of the tessellation evaluation shader.
1015 enum brw_tess_partitioning
{
1016 BRW_TESS_PARTITIONING_INTEGER
= 0,
1017 BRW_TESS_PARTITIONING_ODD_FRACTIONAL
= 1,
1018 BRW_TESS_PARTITIONING_EVEN_FRACTIONAL
= 2,
1021 enum brw_tess_output_topology
{
1022 BRW_TESS_OUTPUT_TOPOLOGY_POINT
= 0,
1023 BRW_TESS_OUTPUT_TOPOLOGY_LINE
= 1,
1024 BRW_TESS_OUTPUT_TOPOLOGY_TRI_CW
= 2,
1025 BRW_TESS_OUTPUT_TOPOLOGY_TRI_CCW
= 3,
1028 enum brw_tess_domain
{
1029 BRW_TESS_DOMAIN_QUAD
= 0,
1030 BRW_TESS_DOMAIN_TRI
= 1,
1031 BRW_TESS_DOMAIN_ISOLINE
= 2,
1035 struct brw_vue_prog_data
{
1036 struct brw_stage_prog_data base
;
1037 struct brw_vue_map vue_map
;
1039 /** Should the hardware deliver input VUE handles for URB pull loads? */
1040 bool include_vue_handles
;
1042 GLuint urb_read_length
;
1045 uint32_t clip_distance_mask
;
1046 uint32_t cull_distance_mask
;
1048 /* Used for calculating urb partitions. In the VS, this is the size of the
1049 * URB entry used for both input and output to the thread. In the GS, this
1050 * is the size of the URB entry used for output.
1052 GLuint urb_entry_size
;
1054 enum shader_dispatch_mode dispatch_mode
;
1057 struct brw_vs_prog_data
{
1058 struct brw_vue_prog_data base
;
1060 GLbitfield64 inputs_read
;
1061 GLbitfield64 double_inputs_read
;
1063 unsigned nr_attribute_slots
;
1066 bool uses_instanceid
;
1067 bool uses_is_indexed_draw
;
1068 bool uses_firstvertex
;
1069 bool uses_baseinstance
;
1073 struct brw_tcs_prog_data
1075 struct brw_vue_prog_data base
;
1077 /** Number vertices in output patch */
1082 struct brw_tes_prog_data
1084 struct brw_vue_prog_data base
;
1086 enum brw_tess_partitioning partitioning
;
1087 enum brw_tess_output_topology output_topology
;
1088 enum brw_tess_domain domain
;
1091 struct brw_gs_prog_data
1093 struct brw_vue_prog_data base
;
1095 unsigned vertices_in
;
1098 * Size of an output vertex, measured in HWORDS (32 bytes).
1100 unsigned output_vertex_size_hwords
;
1102 unsigned output_topology
;
1105 * Size of the control data (cut bits or StreamID bits), in hwords (32
1106 * bytes). 0 if there is no control data.
1108 unsigned control_data_header_size_hwords
;
1111 * Format of the control data (either GEN7_GS_CONTROL_DATA_FORMAT_GSCTL_SID
1112 * if the control data is StreamID bits, or
1113 * GEN7_GS_CONTROL_DATA_FORMAT_GSCTL_CUT if the control data is cut bits).
1114 * Ignored if control_data_header_size is 0.
1116 unsigned control_data_format
;
1118 bool include_primitive_id
;
1121 * The number of vertices emitted, if constant - otherwise -1.
1123 int static_vertex_count
;
1128 * Gen6: Provoking vertex convention for odd-numbered triangles
1134 * Gen6: Number of varyings that are output to transform feedback.
1136 GLuint num_transform_feedback_bindings
:7; /* 0-BRW_MAX_SOL_BINDINGS */
1139 * Gen6: Map from the index of a transform feedback binding table entry to the
1140 * gl_varying_slot that should be streamed out through that binding table
1143 unsigned char transform_feedback_bindings
[64 /* BRW_MAX_SOL_BINDINGS */];
1146 * Gen6: Map from the index of a transform feedback binding table entry to the
1147 * swizzles that should be used when streaming out data through that
1148 * binding table entry.
1150 unsigned char transform_feedback_swizzles
[64 /* BRW_MAX_SOL_BINDINGS */];
1153 struct brw_sf_prog_data
{
1154 uint32_t urb_read_length
;
1157 /* Each vertex may have upto 12 attributes, 4 components each,
1158 * except WPOS which requires only 2. (11*4 + 2) == 44 ==> 11
1161 * Actually we use 4 for each, so call it 12 rows.
1163 unsigned urb_entry_size
;
1166 struct brw_clip_prog_data
{
1167 uint32_t curb_read_length
; /* user planes? */
1169 uint32_t urb_read_length
;
1173 /* brw_any_prog_data is prog_data for any stage that maps to an API stage */
1174 union brw_any_prog_data
{
1175 struct brw_stage_prog_data base
;
1176 struct brw_vue_prog_data vue
;
1177 struct brw_vs_prog_data vs
;
1178 struct brw_tcs_prog_data tcs
;
1179 struct brw_tes_prog_data tes
;
1180 struct brw_gs_prog_data gs
;
1181 struct brw_wm_prog_data wm
;
1182 struct brw_cs_prog_data cs
;
1185 #define DEFINE_PROG_DATA_DOWNCAST(stage) \
1186 static inline struct brw_##stage##_prog_data * \
1187 brw_##stage##_prog_data(struct brw_stage_prog_data *prog_data) \
1189 return (struct brw_##stage##_prog_data *) prog_data; \
1191 DEFINE_PROG_DATA_DOWNCAST(vue
)
1192 DEFINE_PROG_DATA_DOWNCAST(vs
)
1193 DEFINE_PROG_DATA_DOWNCAST(tcs
)
1194 DEFINE_PROG_DATA_DOWNCAST(tes
)
1195 DEFINE_PROG_DATA_DOWNCAST(gs
)
1196 DEFINE_PROG_DATA_DOWNCAST(wm
)
1197 DEFINE_PROG_DATA_DOWNCAST(cs
)
1198 DEFINE_PROG_DATA_DOWNCAST(ff_gs
)
1199 DEFINE_PROG_DATA_DOWNCAST(clip
)
1200 DEFINE_PROG_DATA_DOWNCAST(sf
)
1201 #undef DEFINE_PROG_DATA_DOWNCAST
1205 struct brw_compiler
*
1206 brw_compiler_create(void *mem_ctx
, const struct gen_device_info
*devinfo
);
1209 * Returns a compiler configuration for use with disk shader cache
1211 * This value only needs to change for settings that can cause different
1212 * program generation between two runs on the same hardware.
1214 * For example, it doesn't need to be different for gen 8 and gen 9 hardware,
1215 * but it does need to be different if INTEL_DEBUG=nocompact is or isn't used.
1218 brw_get_compiler_config_value(const struct brw_compiler
*compiler
);
1221 brw_prog_data_size(gl_shader_stage stage
);
1224 brw_prog_key_size(gl_shader_stage stage
);
1227 * Compile a vertex shader.
1229 * Returns the final assembly and the program's size.
1232 brw_compile_vs(const struct brw_compiler
*compiler
, void *log_data
,
1234 const struct brw_vs_prog_key
*key
,
1235 struct brw_vs_prog_data
*prog_data
,
1236 struct nir_shader
*shader
,
1237 int shader_time_index
,
1241 * Compile a tessellation control shader.
1243 * Returns the final assembly and the program's size.
1246 brw_compile_tcs(const struct brw_compiler
*compiler
,
1249 const struct brw_tcs_prog_key
*key
,
1250 struct brw_tcs_prog_data
*prog_data
,
1251 struct nir_shader
*nir
,
1252 int shader_time_index
,
1256 * Compile a tessellation evaluation shader.
1258 * Returns the final assembly and the program's size.
1261 brw_compile_tes(const struct brw_compiler
*compiler
, void *log_data
,
1263 const struct brw_tes_prog_key
*key
,
1264 const struct brw_vue_map
*input_vue_map
,
1265 struct brw_tes_prog_data
*prog_data
,
1266 struct nir_shader
*shader
,
1267 struct gl_program
*prog
,
1268 int shader_time_index
,
1272 * Compile a vertex shader.
1274 * Returns the final assembly and the program's size.
1277 brw_compile_gs(const struct brw_compiler
*compiler
, void *log_data
,
1279 const struct brw_gs_prog_key
*key
,
1280 struct brw_gs_prog_data
*prog_data
,
1281 struct nir_shader
*shader
,
1282 struct gl_program
*prog
,
1283 int shader_time_index
,
1287 * Compile a strips and fans shader.
1289 * This is a fixed-function shader determined entirely by the shader key and
1292 * Returns the final assembly and the program's size.
1295 brw_compile_sf(const struct brw_compiler
*compiler
,
1297 const struct brw_sf_prog_key
*key
,
1298 struct brw_sf_prog_data
*prog_data
,
1299 struct brw_vue_map
*vue_map
,
1300 unsigned *final_assembly_size
);
1303 * Compile a clipper shader.
1305 * This is a fixed-function shader determined entirely by the shader key and
1308 * Returns the final assembly and the program's size.
1311 brw_compile_clip(const struct brw_compiler
*compiler
,
1313 const struct brw_clip_prog_key
*key
,
1314 struct brw_clip_prog_data
*prog_data
,
1315 struct brw_vue_map
*vue_map
,
1316 unsigned *final_assembly_size
);
1319 * Compile a fragment shader.
1321 * Returns the final assembly and the program's size.
1324 brw_compile_fs(const struct brw_compiler
*compiler
, void *log_data
,
1326 const struct brw_wm_prog_key
*key
,
1327 struct brw_wm_prog_data
*prog_data
,
1328 struct nir_shader
*shader
,
1329 struct gl_program
*prog
,
1330 int shader_time_index8
,
1331 int shader_time_index16
,
1332 int shader_time_index32
,
1333 bool allow_spilling
,
1334 bool use_rep_send
, struct brw_vue_map
*vue_map
,
1338 * Compile a compute shader.
1340 * Returns the final assembly and the program's size.
1343 brw_compile_cs(const struct brw_compiler
*compiler
, void *log_data
,
1345 const struct brw_cs_prog_key
*key
,
1346 struct brw_cs_prog_data
*prog_data
,
1347 const struct nir_shader
*shader
,
1348 int shader_time_index
,
1351 void brw_debug_key_recompile(const struct brw_compiler
*c
, void *log
,
1352 gl_shader_stage stage
,
1353 const void *old_key
, const void *key
);
1355 static inline uint32_t
1356 encode_slm_size(unsigned gen
, uint32_t bytes
)
1358 uint32_t slm_size
= 0;
1360 /* Shared Local Memory is specified as powers of two, and encoded in
1361 * INTERFACE_DESCRIPTOR_DATA with the following representations:
1363 * Size | 0 kB | 1 kB | 2 kB | 4 kB | 8 kB | 16 kB | 32 kB | 64 kB |
1364 * -------------------------------------------------------------------
1365 * Gen7-8 | 0 | none | none | 1 | 2 | 4 | 8 | 16 |
1366 * -------------------------------------------------------------------
1367 * Gen9+ | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
1369 assert(bytes
<= 64 * 1024);
1372 /* Shared Local Memory Size is specified as powers of two. */
1373 slm_size
= util_next_power_of_two(bytes
);
1376 /* Use a minimum of 1kB; turn an exponent of 10 (1024 kB) into 1. */
1377 slm_size
= ffs(MAX2(slm_size
, 1024)) - 10;
1379 /* Use a minimum of 4kB; convert to the pre-Gen9 representation. */
1380 slm_size
= MAX2(slm_size
, 4096) / 4096;
1388 * Return true if the given shader stage is dispatched contiguously by the
1389 * relevant fixed function starting from channel 0 of the SIMD thread, which
1390 * implies that the dispatch mask of a thread can be assumed to have the form
1391 * '2^n - 1' for some n.
1394 brw_stage_has_packed_dispatch(MAYBE_UNUSED
const struct gen_device_info
*devinfo
,
1395 gl_shader_stage stage
,
1396 const struct brw_stage_prog_data
*prog_data
)
1398 /* The code below makes assumptions about the hardware's thread dispatch
1399 * behavior that could be proven wrong in future generations -- Make sure
1400 * to do a full test run with brw_fs_test_dispatch_packing() hooked up to
1401 * the NIR front-end before changing this assertion.
1403 assert(devinfo
->gen
<= 11);
1406 case MESA_SHADER_FRAGMENT
: {
1407 /* The PSD discards subspans coming in with no lit samples, which in the
1408 * per-pixel shading case implies that each subspan will either be fully
1409 * lit (due to the VMask being used to allow derivative computations),
1410 * or not dispatched at all. In per-sample dispatch mode individual
1411 * samples from the same subspan have a fixed relative location within
1412 * the SIMD thread, so dispatch of unlit samples cannot be avoided in
1413 * general and we should return false.
1415 const struct brw_wm_prog_data
*wm_prog_data
=
1416 (const struct brw_wm_prog_data
*)prog_data
;
1417 return !wm_prog_data
->persample_dispatch
;
1419 case MESA_SHADER_COMPUTE
:
1420 /* Compute shaders will be spawned with either a fully enabled dispatch
1421 * mask or with whatever bottom/right execution mask was given to the
1422 * GPGPU walker command to be used along the workgroup edges -- In both
1423 * cases the dispatch mask is required to be tightly packed for our
1424 * invocation index calculations to work.
1428 /* Most remaining fixed functions are limited to use a packed dispatch
1429 * mask due to the hardware representation of the dispatch mask as a
1430 * single counter representing the number of enabled channels.
1437 * Computes the first varying slot in the URB produced by the previous stage
1438 * that is used in the next stage. We do this by testing the varying slots in
1439 * the previous stage's vue map against the inputs read in the next stage.
1443 * - Each URB offset contains two varying slots and we can only skip a
1444 * full offset if both slots are unused, so the value we return here is always
1445 * rounded down to the closest multiple of two.
1447 * - gl_Layer and gl_ViewportIndex don't have their own varying slots, they are
1448 * part of the vue header, so if these are read we can't skip anything.
1451 brw_compute_first_urb_slot_required(uint64_t inputs_read
,
1452 const struct brw_vue_map
*prev_stage_vue_map
)
1454 if ((inputs_read
& (VARYING_BIT_LAYER
| VARYING_BIT_VIEWPORT
)) == 0) {
1455 for (int i
= 0; i
< prev_stage_vue_map
->num_slots
; i
++) {
1456 int varying
= prev_stage_vue_map
->slot_to_varying
[i
];
1457 if (varying
> 0 && (inputs_read
& BITFIELD64_BIT(varying
)) != 0)
1458 return ROUND_DOWN_TO(i
, 2);
1469 #endif /* BRW_COMPILER_H */