1 /*
2 * Copyright (C) 2019 Connor Abbott <cwabbott0@gmail.com>
3 * Copyright (C) 2019 Lyude Paul <thatslyude@gmail.com>
4 * Copyright (C) 2019 Ryan Houdek <Sonicadvance1@gmail.com>
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice (including the next
14 * paragraph) shall be included in all copies or substantial portions of the
15 * Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24 */
25
26 #ifndef __bifrost_h__
27 #define __bifrost_h__
28
29 #include <stdint.h>
30 #include <stdbool.h>
31 #include <assert.h>
32
33 #define BIFROST_DBG_MSGS 0x0001
34 #define BIFROST_DBG_SHADERS 0x0002
35 #define BIFROST_DBG_SHADERDB 0x0004
36 #define BIFROST_DBG_VERBOSE 0x0008
37 #define BIFROST_DBG_INTERNAL 0x0010
38 #define BIFROST_DBG_NOSCHED 0x0020
39 #define BIFROST_DBG_INORDER 0x0040
40 #define BIFROST_DBG_NOVALIDATE 0x0080
41 #define BIFROST_DBG_NOOPT 0x0100
42
43 extern int bifrost_debug;
44
45 enum bifrost_message_type {
46 BIFROST_MESSAGE_NONE = 0,
47 BIFROST_MESSAGE_VARYING = 1,
48 BIFROST_MESSAGE_ATTRIBUTE = 2,
49 BIFROST_MESSAGE_TEX = 3,
50 BIFROST_MESSAGE_VARTEX = 4,
51 BIFROST_MESSAGE_LOAD = 5,
52 BIFROST_MESSAGE_STORE = 6,
53 BIFROST_MESSAGE_ATOMIC = 7,
54 BIFROST_MESSAGE_BARRIER = 8,
55 BIFROST_MESSAGE_BLEND = 9,
56 BIFROST_MESSAGE_TILE = 10,
57 /* type 11 reserved */
58 BIFROST_MESSAGE_Z_STENCIL = 12,
59 BIFROST_MESSAGE_ATEST = 13,
60 BIFROST_MESSAGE_JOB = 14,
61 BIFROST_MESSAGE_64BIT = 15
62 };
63
64 enum bifrost_ftz {
65 BIFROST_FTZ_DISABLE = 0,
66 BIFROST_FTZ_DX11 = 1,
67 BIFROST_FTZ_ALWAYS = 2,
68 BIFROST_FTZ_ABRUPT = 3
69 };
70
71 enum bifrost_exceptions {
72 BIFROST_EXCEPTIONS_ENABLED = 0,
73 BIFROST_EXCEPTIONS_DISABLED = 1,
74 BIFROST_EXCEPTIONS_PRECISE_DIVISION = 2,
75 BIFROST_EXCEPTIONS_PRECISE_SQRT = 3,
76 };
77
78 /* Describes clause flow control, with respect to control flow and branch
79 * reconvergence.
80 *
81 * Control flow may be considered back-to-back (execute clauses back-to-back),
82 * non-back-to-back (switch warps after clause before the next clause), write
83 * elision (back-to-back and elide register slot #3 write from the clause), or
84 * end of shader.
85 *
86 * Branch reconvergence may be disabled, enabled unconditionally, or enabled
87 * based on the program counter. A clause requires reconvergence if it has a
88 * successor that can be executed without first executing the clause itself.
89 * Separate iterations of a loop are treated separately here, so it is also the
90 * case for a loop exit where the iteration count is not warp-invariant.
91 *
92 */
93
94 enum bifrost_flow {
95 /* End-of-shader */
96 BIFROST_FLOW_END = 0,
97
98 /* Non back-to-back, PC-encoded reconvergence */
99 BIFROST_FLOW_NBTB_PC = 1,
100
101 /* Non back-to-back, unconditional reconvergence */
102 BIFROST_FLOW_NBTB_UNCONDITIONAL = 2,
103
104 /* Non back-to-back, no reconvergence */
105 BIFROST_FLOW_NBTB = 3,
106
107 /* Back-to-back, unconditional reconvergence */
108 BIFROST_FLOW_BTB_UNCONDITIONAL = 4,
109
110 /* Back-to-back, no reconvergence */
111 BIFROST_FLOW_BTB_NONE = 5,
112
113 /* Write elision, unconditional reconvergence */
114 BIFROST_FLOW_WE_UNCONDITIONAL = 6,
115
116 /* Write elision, no reconvergence */
117 BIFROST_FLOW_WE = 7,
118 };
119
120 enum bifrost_slot {
121 /* 0-5 are general purpose */
122 BIFROST_SLOT_ELDEST_DEPTH = 6,
123 BIFROST_SLOT_ELDEST_COLOUR = 7,
124 };
125
126 struct bifrost_header {
127 /* Reserved */
128 unsigned zero1 : 5;
129
130 /* Flush-to-zero mode, leave zero for GL */
131 enum bifrost_ftz flush_to_zero : 2;
132
133 /* Convert any infinite result of any floating-point operation to the
134 * biggest representable number */
135 unsigned suppress_inf: 1;
136
137 /* Convert NaN to +0.0 */
138 unsigned suppress_nan : 1;
139
140 /* Floating-point excception handling mode */
141 enum bifrost_exceptions float_exceptions : 2;
142
143 /* Enum describing the flow control, which matters for handling
144 * divergence and reconvergence efficiently */
145 enum bifrost_flow flow_control : 3;
146
147 /* Reserved */
148 unsigned zero2 : 1;
149
150 /* Terminate discarded threads, rather than continuing execution. Set
151 * for fragment shaders for standard GL behaviour of DISCARD. Also in a
152 * fragment shader, this disables helper invocations, so cannot be used
153 * in a shader that requires derivatives or texture LOD computation */
154 unsigned terminate_discarded_threads : 1;
155
156 /* If set, the hardware may prefetch the next clause. If false, the
157 * hardware may not. Clear for unconditional branches. */
158 unsigned next_clause_prefetch : 1;
159
160 /* If set, a barrier will be inserted after the clause waiting for all
161 * message passing instructions to read their staging registers, such
162 * that it is safe for the next clause to write them. */
163 unsigned staging_barrier: 1;
164 unsigned staging_register : 6;
165
166 /* Slots to wait on and slot to be used for message passing
167 * instructions respectively */
168 unsigned dependency_wait : 8;
169 unsigned dependency_slot : 3;
170
171 enum bifrost_message_type message_type : 5;
172 enum bifrost_message_type next_message_type : 5;
173 } __attribute__((packed));
174
175 enum bifrost_packed_src {
176 BIFROST_SRC_PORT0 = 0,
177 BIFROST_SRC_PORT1 = 1,
178 BIFROST_SRC_PORT2 = 2,
179 BIFROST_SRC_STAGE = 3,
180 BIFROST_SRC_FAU_LO = 4,
181 BIFROST_SRC_FAU_HI = 5,
182 BIFROST_SRC_PASS_FMA = 6,
183 BIFROST_SRC_PASS_ADD = 7,
184 };
185
186 struct bifrost_fma_inst {
187 unsigned src0 : 3;
188 unsigned op : 20;
189 } __attribute__((packed));
190
191 struct bifrost_add_inst {
192 unsigned src0 : 3;
193 unsigned op : 17;
194 } __attribute__((packed));
195
196 enum branch_bit_size {
197 BR_SIZE_32 = 0,
198 BR_SIZE_16XX = 1,
199 BR_SIZE_16YY = 2,
200 // For the above combinations of bitsize and location, an extra bit is
201 // encoded via comparing the sources. The only possible source of ambiguity
202 // would be if the sources were the same, but then the branch condition
203 // would be always true or always false anyways, so we can ignore it. But
204 // this no longer works when comparing the y component to the x component,
205 // since it's valid to compare the y component of a source against its own
206 // x component. Instead, the extra bit is encoded via an extra bitsize.
207 BR_SIZE_16YX0 = 3,
208 BR_SIZE_16YX1 = 4,
209 BR_SIZE_32_AND_16X = 5,
210 BR_SIZE_32_AND_16Y = 6,
211 // Used for comparisons with zero and always-true, see below. I think this
212 // only works for integer comparisons.
213 BR_SIZE_ZERO = 7,
214 };
215
216 struct bifrost_regs {
217 unsigned fau_idx : 8;
218 unsigned reg3 : 6;
219 unsigned reg2 : 6;
220 unsigned reg0 : 5;
221 unsigned reg1 : 6;
222 unsigned ctrl : 4;
223 } __attribute__((packed));
224
225 #define BIFROST_FMTC_CONSTANTS 0b0011
226 #define BIFROST_FMTC_FINAL 0b0111
227
228 struct bifrost_fmt_constant {
229 unsigned pos : 4;
230 unsigned tag : 4;
231 uint64_t imm_1 : 60;
232 uint64_t imm_2 : 60;
233 } __attribute__((packed));
234
235 /* Clause formats, encoded in a table */
236
237 enum bi_clause_subword {
238 /* Literal 3-bit values */
239 BI_CLAUSE_SUBWORD_LITERAL_0 = 0,
240 /* etc */
241 BI_CLAUSE_SUBWORD_LITERAL_7 = 7,
242
243 /* The value of the corresponding tuple in the corresponding bits */
244 BI_CLAUSE_SUBWORD_TUPLE_0 = 8,
245 /* etc */
246 BI_CLAUSE_SUBWORD_TUPLE_7 = 15,
247
248 /* Clause header */
249 BI_CLAUSE_SUBWORD_HEADER = 16,
250
251 /* Leave zero, but semantically distinct from literal 0 */
252 BI_CLAUSE_SUBWORD_RESERVED = 17,
253
254 /* Embedded constant 0 */
255 BI_CLAUSE_SUBWORD_CONSTANT = 18,
256
257 /* M bits controlling modifier for the constant */
258 BI_CLAUSE_SUBWORD_M = 19,
259
260 /* Z bit: 1 to begin encoding constants, 0 to terminate the clause */
261 BI_CLAUSE_SUBWORD_Z = 20,
262
263 /* Upper 3-bits of a given tuple and zero extended */
264 BI_CLAUSE_SUBWORD_UPPER_0 = 32,
265 /* etc */
266 BI_CLAUSE_SUBWORD_UPPER_7 = BI_CLAUSE_SUBWORD_UPPER_0 + 7,
267
268 /* Upper 3-bits of two tuples, concatenated and zero-extended */
269 BI_CLAUSE_SUBWORD_UPPER_23 = BI_CLAUSE_SUBWORD_UPPER_0 + 23,
270 BI_CLAUSE_SUBWORD_UPPER_56 = BI_CLAUSE_SUBWORD_UPPER_0 + 56,
271 };
272
273 #define L(x) (BI_CLAUSE_SUBWORD_LITERAL_0 + x)
274 #define U(x) (BI_CLAUSE_SUBWORD_UPPER_0 + x)
275 #define T(x) (BI_CLAUSE_SUBWORD_TUPLE_0 + x)
276 #define EC BI_CLAUSE_SUBWORD_CONSTANT
277 #define M BI_CLAUSE_SUBWORD_M
278 #define Z BI_CLAUSE_SUBWORD_Z
279 #define H BI_CLAUSE_SUBWORD_HEADER
280 #define R BI_CLAUSE_SUBWORD_RESERVED
281
282 struct bi_clause_format {
283 unsigned format; /* format number */
284 unsigned pos; /* index in the clause */
285 enum bi_clause_subword tag_1; /* 2-bits */
286 enum bi_clause_subword tag_2; /* 3-bits */
287 enum bi_clause_subword tag_3; /* 3-bits */
288 enum bi_clause_subword s0_s3; /* 60 bits */
289 enum bi_clause_subword s4; /* 15 bits */
290 enum bi_clause_subword s5_s6; /* 30 bits */
291 enum bi_clause_subword s7; /* 15 bits */
292 };
293
294 static const struct bi_clause_format bi_clause_formats[] = {
295 { 0, 0, L(0), L(5), U(0), T(0), T(0), H, H },
296 { 0, 0, Z, L(1), U(0), T(0), T(0), H, H },
297 { 1, 1, Z, L(0), L(3), T(1), T(1), R, U(1) },
298 { 2, 1, L(0), L(4), U(1), T(1), T(1), T(2), T(2) },
299 { 3, 2, Z, L(0), L(4), EC, M, T(2), U(2) },
300 { 4, 2, L(0), L(0), L(1), T(3), T(3), T(2), U(23) },
301 { 4, 2, Z, L(0), L(5), T(3), T(3), T(2), U(23) },
302 { 5, 2, L(2), U(3), U(2), T(3), T(3), T(2), EC },
303 { 6, 3, Z, L(2), U(4), T(4), T(4), EC, EC },
304 { 7, 3, L(1), L(4), U(4), T(4), T(4), T(5), T(5) },
305 { 8, 4, Z, L(0), L(6), EC, M, T(5), U(5) },
306 { 9, 4, Z, L(0), L(7), T(6), T(6), T(5), U(56) },
307 { 10, 4, L(3), U(6), U(5), T(6), T(6), T(5), EC },
308 { 11, 5, Z, L(3), U(7), T(7), T(7), EC, EC },
309 };
310
311 #undef L
312 #undef U
313 #undef T
314 #undef EC
315 #undef M
316 #undef Z
317 #undef H
318 #undef R
319
320 /* 32-bit modes for slots 2/3, as encoded in the register block. Other values
321 * are reserved. First part specifies behaviour of slot 2 (Idle, Read, Write
322 * Full, Write Low, Write High), second part behaviour of slot 3, and the last
323 * part specifies the source for the write (FMA, ADD, or MIX for FMA/ADD).
324 *
325 * IDLE is a special mode disabling both slots, except for the first
326 * instruction in the clause which uses IDLE_1 for the same purpose.
327 *
328 * All fields 0 used as sentinel for reserved encoding, so IDLE(_1) have FMA
329 * set (and ignored) as a placeholder to differentiate from reserved.
330 */
331 enum bifrost_reg_mode {
332 BIFROST_R_WL_FMA = 1,
333 BIFROST_R_WH_FMA = 2,
334 BIFROST_R_W_FMA = 3,
335 BIFROST_R_WL_ADD = 4,
336 BIFROST_R_WH_ADD = 5,
337 BIFROST_R_W_ADD = 6,
338 BIFROST_WL_WL_ADD = 7,
339 BIFROST_WL_WH_ADD = 8,
340 BIFROST_WL_W_ADD = 9,
341 BIFROST_WH_WL_ADD = 10,
342 BIFROST_WH_WH_ADD = 11,
343 BIFROST_WH_W_ADD = 12,
344 BIFROST_W_WL_ADD = 13,
345 BIFROST_W_WH_ADD = 14,
346 BIFROST_W_W_ADD = 15,
347 BIFROST_IDLE_1 = 16,
348 BIFROST_I_W_FMA = 17,
349 BIFROST_I_WL_FMA = 18,
350 BIFROST_I_WH_FMA = 19,
351 BIFROST_R_I = 20,
352 BIFROST_I_W_ADD = 21,
353 BIFROST_I_WL_ADD = 22,
354 BIFROST_I_WH_ADD = 23,
355 BIFROST_WL_WH_MIX = 24,
356 BIFROST_WH_WL_MIX = 26,
357 BIFROST_IDLE = 27,
358 };
359
360 enum bifrost_reg_op {
361 BIFROST_OP_IDLE = 0,
362 BIFROST_OP_READ = 1,
363 BIFROST_OP_WRITE = 2,
364 BIFROST_OP_WRITE_LO = 3,
365 BIFROST_OP_WRITE_HI = 4,
366 };
367
368 struct bifrost_reg_ctrl_23 {
369 enum bifrost_reg_op slot2;
370 enum bifrost_reg_op slot3;
371 bool slot3_fma;
372 };
373
374 static const struct bifrost_reg_ctrl_23 bifrost_reg_ctrl_lut[32] = {
375 [BIFROST_R_WL_FMA] = { BIFROST_OP_READ, BIFROST_OP_WRITE_LO, true },
376 [BIFROST_R_WH_FMA] = { BIFROST_OP_READ, BIFROST_OP_WRITE_HI, true },
377 [BIFROST_R_W_FMA] = { BIFROST_OP_READ, BIFROST_OP_WRITE, true },
378 [BIFROST_R_WL_ADD] = { BIFROST_OP_READ, BIFROST_OP_WRITE_LO, false },
379 [BIFROST_R_WH_ADD] = { BIFROST_OP_READ, BIFROST_OP_WRITE_HI, false },
380 [BIFROST_R_W_ADD] = { BIFROST_OP_READ, BIFROST_OP_WRITE, false },
381 [BIFROST_WL_WL_ADD] = { BIFROST_OP_WRITE_LO, BIFROST_OP_WRITE_LO, false },
382 [BIFROST_WL_WH_ADD] = { BIFROST_OP_WRITE_LO, BIFROST_OP_WRITE_HI, false },
383 [BIFROST_WL_W_ADD] = { BIFROST_OP_WRITE_LO, BIFROST_OP_WRITE, false },
384 [BIFROST_WH_WL_ADD] = { BIFROST_OP_WRITE_HI, BIFROST_OP_WRITE_LO, false },
385 [BIFROST_WH_WH_ADD] = { BIFROST_OP_WRITE_HI, BIFROST_OP_WRITE_HI, false },
386 [BIFROST_WH_W_ADD] = { BIFROST_OP_WRITE_HI, BIFROST_OP_WRITE, false },
387 [BIFROST_W_WL_ADD] = { BIFROST_OP_WRITE, BIFROST_OP_WRITE_LO, false },
388 [BIFROST_W_WH_ADD] = { BIFROST_OP_WRITE, BIFROST_OP_WRITE_HI, false },
389 [BIFROST_W_W_ADD] = { BIFROST_OP_WRITE, BIFROST_OP_WRITE, false },
390 [BIFROST_IDLE_1] = { BIFROST_OP_IDLE, BIFROST_OP_IDLE, true },
391 [BIFROST_I_W_FMA] = { BIFROST_OP_IDLE, BIFROST_OP_WRITE, true },
392 [BIFROST_I_WL_FMA] = { BIFROST_OP_IDLE, BIFROST_OP_WRITE_LO, true },
393 [BIFROST_I_WH_FMA] = { BIFROST_OP_IDLE, BIFROST_OP_WRITE_HI, true },
394 [BIFROST_R_I] = { BIFROST_OP_READ, BIFROST_OP_IDLE, false },
395 [BIFROST_I_W_ADD] = { BIFROST_OP_IDLE, BIFROST_OP_WRITE, false },
396 [BIFROST_I_WL_ADD] = { BIFROST_OP_IDLE, BIFROST_OP_WRITE_LO, false },
397 [BIFROST_I_WH_ADD] = { BIFROST_OP_IDLE, BIFROST_OP_WRITE_HI, false },
398 [BIFROST_WL_WH_MIX] = { BIFROST_OP_WRITE_LO, BIFROST_OP_WRITE_HI, false },
399 [BIFROST_WH_WL_MIX] = { BIFROST_OP_WRITE_HI, BIFROST_OP_WRITE_LO, false },
400 [BIFROST_IDLE] = { BIFROST_OP_IDLE, BIFROST_OP_IDLE, true },
401 };
402
403 /* Texture operator descriptors in various states. Usually packed in the
404 * compiler and stored as a constant */
405
406 enum bifrost_index {
407 /* Both texture/sampler index immediate */
408 BIFROST_INDEX_IMMEDIATE_SHARED = 0,
409
410 /* Sampler index immediate, texture index from staging */
411 BIFROST_INDEX_IMMEDIATE_SAMPLER = 1,
412
413 /* Texture index immediate, sampler index from staging */
414 BIFROST_INDEX_IMMEDIATE_TEXTURE = 2,
415
416 /* Both indices from (separate) staging registers */
417 BIFROST_INDEX_REGISTER = 3,
418 };
419
420 enum bifrost_tex_op {
421 /* Given explicit derivatives, compute a gradient descriptor */
422 BIFROST_TEX_OP_GRDESC_DER = 4,
423
424 /* Given implicit derivatives (texture coordinates in a fragment
425 * shader), compute a gradient descriptor */
426 BIFROST_TEX_OP_GRDESC = 5,
427
428 /* Fetch a texel. Takes a staging register with LOD level / face index
429 * packed 16:16 */
430 BIFROST_TEX_OP_FETCH = 6,
431
432 /* Filtered texture */
433 BIFROST_TEX_OP_TEX = 7,
434 };
435
436 enum bifrost_lod_mode {
437 /* Takes two staging registers forming a 64-bit gradient descriptor
438 * (computed by a previous GRDESC or GRDESC_DER operation) */
439 BIFROST_LOD_MODE_GRDESC = 3,
440
441 /* Take a staging register with 8:8 fixed-point in bottom 16-bits
442 * specifying an explicit LOD */
443 BIFROST_LOD_MODE_EXPLICIT = 4,
444
445 /* Takes a staging register with bottom 16-bits as 8:8 fixed-point LOD
446 * bias and top 16-bit as 8:8 fixed-point lower bound (generally left
447 * zero), added and clamped to a computed LOD */
448 BIFROST_LOD_MODE_BIAS = 5,
449
450 /* Set LOD to zero */
451 BIFROST_LOD_MODE_ZERO = 6,
452
453 /* Compute LOD */
454 BIFROST_LOD_MODE_COMPUTE = 7,
455 };
456
457 enum bifrost_texture_format {
458 /* 16-bit floating point, with optional clamping */
459 BIFROST_TEXTURE_FORMAT_F16 = 0,
460 BIFROST_TEXTURE_FORMAT_F16_POS = 1,
461 BIFROST_TEXTURE_FORMAT_F16_PM1 = 2,
462 BIFROST_TEXTURE_FORMAT_F16_1 = 3,
463
464 /* 32-bit floating point, with optional clamping */
465 BIFROST_TEXTURE_FORMAT_F32 = 4,
466 BIFROST_TEXTURE_FORMAT_F32_POS = 5,
467 BIFROST_TEXTURE_FORMAT_F32_PM1 = 6,
468 BIFROST_TEXTURE_FORMAT_F32_1 = 7,
469 };
470
471 enum bifrost_texture_format_full {
472 /* Transclude bifrost_texture_format from above */
473
474 /* Integers, unclamped */
475 BIFROST_TEXTURE_FORMAT_U16 = 12,
476 BIFROST_TEXTURE_FORMAT_S16 = 13,
477 BIFROST_TEXTURE_FORMAT_U32 = 14,
478 BIFROST_TEXTURE_FORMAT_S32 = 15,
479 };
480
481 enum bifrost_texture_fetch {
482 /* Default texelFetch */
483 BIFROST_TEXTURE_FETCH_TEXEL = 1,
484
485 /* Deprecated, fetches 4x U32 of a U8 x 4 texture. Do not use. */
486 BIFROST_TEXTURE_FETCH_GATHER4_RGBA = 3,
487
488 /* Gathers */
489 BIFROST_TEXTURE_FETCH_GATHER4_R = 4,
490 BIFROST_TEXTURE_FETCH_GATHER4_G = 5,
491 BIFROST_TEXTURE_FETCH_GATHER4_B = 6,
492 BIFROST_TEXTURE_FETCH_GATHER4_A = 7
493 };
494
495 struct bifrost_texture_operation {
496 /* If immediate_indices is set:
497 * - immediate sampler index
498 * - index used as texture index
499 * Otherwise:
500 * - bifrost_single_index in lower 2 bits
501 * - 0x3 in upper 2 bits (single-texturing)
502 */
503 unsigned sampler_index_or_mode : 4;
504 unsigned index : 7;
505 bool immediate_indices : 1;
506 enum bifrost_tex_op op : 3;
507
508 /* If set for TEX/FETCH, loads texel offsets and multisample index from
509 * a staging register containing offset_x:offset_y:offset_z:ms_index
510 * packed 8:8:8:8. Offsets must be in [-31, +31]. If set for
511 * GRDESC(_DER), disable LOD bias. */
512 bool offset_or_bias_disable : 1;
513
514 /* If set for TEX/FETCH, loads fp32 shadow comparison value from a
515 * staging register. Implies fetch_component = gather4_r. If set for
516 * GRDESC(_DER), disables LOD clamping. */
517 bool shadow_or_clamp_disable : 1;
518
519 /* If set, loads an uint32 array index from a staging register. */
520 bool array : 1;
521
522 /* Texture dimension, or 0 for a cubemap */
523 unsigned dimension : 2;
524
525 /* Method to compute LOD value or for a FETCH, the
526 * bifrost_texture_fetch component specification */
527 enum bifrost_lod_mode lod_or_fetch : 3;
528
529 /* Reserved */
530 unsigned zero : 1;
531
532 /* Register format for the result */
533 enum bifrost_texture_format_full format : 4;
534
535 /* Write mask for the result */
536 unsigned mask : 4;
537 } __attribute__((packed));
538
539 #define BIFROST_MEGA_SAMPLE 128
540 #define BIFROST_ALL_SAMPLES 255
541 #define BIFROST_CURRENT_PIXEL 255
542
543 struct bifrost_pixel_indices {
544 unsigned sample : 8;
545 unsigned rt : 8;
546 unsigned x : 8;
547 unsigned y : 8;
548 } __attribute__((packed));
549
550 enum bi_constmod {
551 BI_CONSTMOD_NONE,
552 BI_CONSTMOD_PC_LO,
553 BI_CONSTMOD_PC_HI,
554 BI_CONSTMOD_PC_LO_HI
555 };
556
557 struct bi_constants {
558 /* Raw constant values */
559 uint64_t raw[6];
560
561 /* Associated modifier derived from M values */
562 enum bi_constmod mods[6];
563 };
564
565 /* FAU selectors for constants are out-of-order, construct the top bits
566 * here given a embedded constant index in a clause */
567
568 static inline unsigned
bi_constant_field(unsigned idx)569 bi_constant_field(unsigned idx)
570 {
571 const unsigned values[] = {
572 4, 5, 6, 7, 2, 3
573 };
574
575 assert(idx <= 5);
576 return values[idx] << 4;
577 }
578
579 #endif
580