src/gallium/drivers/radeonsi/si_shader_nir.c

   1 /*
   2  * Copyright 2017 Advanced Micro Devices, Inc.
   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  * on the rights to use, copy, modify, merge, publish, distribute, sub
   8  * license, and/or sell copies of the Software, and to permit persons to whom
   9  * the 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 NON-INFRINGEMENT. IN NO EVENT SHALL
  18  * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  21  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 #include "si_shader.h"
  25 #include "si_shader_internal.h"
  26
  27 #include "ac_nir_to_llvm.h"
  28
  29 #include "tgsi/tgsi_from_mesa.h"
  30
  31 #include "compiler/nir/nir.h"
  32 #include "compiler/nir_types.h"
  33
  34
  35 static int
  36 type_size(const struct glsl_type *type)
  37 {
  38    return glsl_count_attribute_slots(type, false);
  39 }
  40
  41 static void scan_instruction(struct tgsi_shader_info *info,
  42                              nir_instr *instr)
  43 {
  44         if (instr->type == nir_instr_type_alu) {
  45                 nir_alu_instr *alu = nir_instr_as_alu(instr);
  46
  47                 switch (alu->op) {
  48                 case nir_op_fddx:
  49                 case nir_op_fddy:
  50                 case nir_op_fddx_fine:
  51                 case nir_op_fddy_fine:
  52                 case nir_op_fddx_coarse:
  53                 case nir_op_fddy_coarse:
  54                         info->uses_derivatives = true;
  55                         break;
  56                 default:
  57                         break;
  58                 }
  59         } else if (instr->type == nir_instr_type_tex) {
  60                 nir_tex_instr *tex = nir_instr_as_tex(instr);
  61
  62                 if (!tex->texture) {
  63                         info->samplers_declared |=
  64                                 u_bit_consecutive(tex->sampler_index, 1);
  65                 }
  66
  67                 switch (tex->op) {
  68                 case nir_texop_tex:
  69                 case nir_texop_txb:
  70                 case nir_texop_lod:
  71                         info->uses_derivatives = true;
  72                         break;
  73                 default:
  74                         break;
  75                 }
  76         } else if (instr->type == nir_instr_type_intrinsic) {
  77                 nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
  78
  79                 switch (intr->intrinsic) {
  80                 case nir_intrinsic_load_front_face:
  81                         info->uses_frontface = 1;
  82                         break;
  83                 case nir_intrinsic_load_instance_id:
  84                         info->uses_instanceid = 1;
  85                         break;
  86                 case nir_intrinsic_load_vertex_id:
  87                         info->uses_vertexid = 1;
  88                         break;
  89                 case nir_intrinsic_load_vertex_id_zero_base:
  90                         info->uses_vertexid_nobase = 1;
  91                         break;
  92                 case nir_intrinsic_load_base_vertex:
  93                         info->uses_basevertex = 1;
  94                         break;
  95                 case nir_intrinsic_load_primitive_id:
  96                         info->uses_primid = 1;
  97                         break;
  98                 case nir_intrinsic_image_store:
  99                 case nir_intrinsic_image_atomic_add:
 100                 case nir_intrinsic_image_atomic_min:
 101                 case nir_intrinsic_image_atomic_max:
 102                 case nir_intrinsic_image_atomic_and:
 103                 case nir_intrinsic_image_atomic_or:
 104                 case nir_intrinsic_image_atomic_xor:
 105                 case nir_intrinsic_image_atomic_exchange:
 106                 case nir_intrinsic_image_atomic_comp_swap:
 107                 case nir_intrinsic_store_ssbo:
 108                 case nir_intrinsic_ssbo_atomic_add:
 109                 case nir_intrinsic_ssbo_atomic_imin:
 110                 case nir_intrinsic_ssbo_atomic_umin:
 111                 case nir_intrinsic_ssbo_atomic_imax:
 112                 case nir_intrinsic_ssbo_atomic_umax:
 113                 case nir_intrinsic_ssbo_atomic_and:
 114                 case nir_intrinsic_ssbo_atomic_or:
 115                 case nir_intrinsic_ssbo_atomic_xor:
 116                 case nir_intrinsic_ssbo_atomic_exchange:
 117                 case nir_intrinsic_ssbo_atomic_comp_swap:
 118                         info->writes_memory = true;
 119                         break;
 120                 default:
 121                         break;
 122                 }
 123         }
 124 }
 125
 126 void si_nir_scan_shader(const struct nir_shader *nir,
 127                         struct tgsi_shader_info *info)
 128 {
 129         nir_function *func;
 130         unsigned i;
 131
 132         assert(nir->info.stage == MESA_SHADER_VERTEX ||
 133                nir->info.stage == MESA_SHADER_FRAGMENT);
 134
 135         info->processor = pipe_shader_type_from_mesa(nir->info.stage);
 136         info->num_tokens = 2; /* indicate that the shader is non-empty */
 137         info->num_instructions = 2;
 138
 139         info->num_inputs = nir->num_inputs;
 140         info->num_outputs = nir->num_outputs;
 141
 142         if (nir->info.stage == MESA_SHADER_GEOMETRY) {
 143                 info->properties[TGSI_PROPERTY_GS_INPUT_PRIM] = nir->info.gs.input_primitive;
 144                 info->properties[TGSI_PROPERTY_GS_OUTPUT_PRIM] = nir->info.gs.output_primitive;
 145                 info->properties[TGSI_PROPERTY_GS_MAX_OUTPUT_VERTICES] = nir->info.gs.vertices_out;
 146                 info->properties[TGSI_PROPERTY_GS_INVOCATIONS] = nir->info.gs.invocations;
 147         }
 148
 149         i = 0;
 150         nir_foreach_variable(variable, &nir->inputs) {
 151                 unsigned semantic_name, semantic_index;
 152                 unsigned attrib_count = glsl_count_attribute_slots(variable->type,
 153                                                                    nir->info.stage == MESA_SHADER_VERTEX);
 154
 155                 assert(attrib_count == 1 && "not implemented");
 156
 157                 /* Vertex shader inputs don't have semantics. The state
 158                  * tracker has already mapped them to attributes via
 159                  * variable->data.driver_location.
 160                  */
 161                 if (nir->info.stage == MESA_SHADER_VERTEX)
 162                         continue;
 163
 164                 /* Fragment shader position is a system value. */
 165                 if (nir->info.stage == MESA_SHADER_FRAGMENT &&
 166                     variable->data.location == VARYING_SLOT_POS) {
 167                         if (variable->data.pixel_center_integer)
 168                                 info->properties[TGSI_PROPERTY_FS_COORD_PIXEL_CENTER] =
 169                                         TGSI_FS_COORD_PIXEL_CENTER_INTEGER;
 170                         continue;
 171                 }
 172
 173                 tgsi_get_gl_varying_semantic(variable->data.location, true,
 174                                              &semantic_name, &semantic_index);
 175
 176                 info->input_semantic_name[i] = semantic_name;
 177                 info->input_semantic_index[i] = semantic_index;
 178
 179                 if (variable->data.sample)
 180                         info->input_interpolate_loc[i] = TGSI_INTERPOLATE_LOC_SAMPLE;
 181                 else if (variable->data.centroid)
 182                         info->input_interpolate_loc[i] = TGSI_INTERPOLATE_LOC_CENTROID;
 183                 else
 184                         info->input_interpolate_loc[i] = TGSI_INTERPOLATE_LOC_CENTER;
 185
 186                 enum glsl_base_type base_type =
 187                         glsl_get_base_type(glsl_without_array(variable->type));
 188
 189                 switch (variable->data.interpolation) {
 190                 case INTERP_MODE_NONE:
 191                         if (glsl_base_type_is_integer(base_type)) {
 192                                 info->input_interpolate[i] = TGSI_INTERPOLATE_CONSTANT;
 193                                 break;
 194                         }
 195
 196                         if (semantic_name == TGSI_SEMANTIC_COLOR) {
 197                                 info->input_interpolate[i] = TGSI_INTERPOLATE_COLOR;
 198                                 goto persp_locations;
 199                         }
 200                         /* fall-through */
 201                 case INTERP_MODE_SMOOTH:
 202                         assert(!glsl_base_type_is_integer(base_type));
 203
 204                         info->input_interpolate[i] = TGSI_INTERPOLATE_PERSPECTIVE;
 205
 206                 persp_locations:
 207                         if (variable->data.sample)
 208                                 info->uses_persp_sample = true;
 209                         else if (variable->data.centroid)
 210                                 info->uses_persp_centroid = true;
 211                         else
 212                                 info->uses_persp_center = true;
 213                         break;
 214
 215                 case INTERP_MODE_NOPERSPECTIVE:
 216                         assert(!glsl_base_type_is_integer(base_type));
 217
 218                         info->input_interpolate[i] = TGSI_INTERPOLATE_LINEAR;
 219
 220                         if (variable->data.sample)
 221                                 info->uses_linear_sample = true;
 222                         else if (variable->data.centroid)
 223                                 info->uses_linear_centroid = true;
 224                         else
 225                                 info->uses_linear_center = true;
 226                         break;
 227
 228                 case INTERP_MODE_FLAT:
 229                         info->input_interpolate[i] = TGSI_INTERPOLATE_CONSTANT;
 230                         break;
 231                 }
 232
 233                 /* TODO make this more precise */
 234                 if (variable->data.location == VARYING_SLOT_COL0)
 235                         info->colors_read |= 0x0f;
 236                 else if (variable->data.location == VARYING_SLOT_COL1)
 237                         info->colors_read |= 0xf0;
 238
 239                 i++;
 240         }
 241
 242         i = 0;
 243         nir_foreach_variable(variable, &nir->outputs) {
 244                 unsigned semantic_name, semantic_index;
 245
 246                 if (nir->info.stage == MESA_SHADER_FRAGMENT) {
 247                         tgsi_get_gl_frag_result_semantic(variable->data.location,
 248                                 &semantic_name, &semantic_index);
 249                 } else {
 250                         tgsi_get_gl_varying_semantic(variable->data.location, true,
 251                                                      &semantic_name, &semantic_index);
 252                 }
 253
 254                 info->output_semantic_name[i] = semantic_name;
 255                 info->output_semantic_index[i] = semantic_index;
 256                 info->output_usagemask[i] = TGSI_WRITEMASK_XYZW;
 257
 258                 unsigned num_components = 4;
 259                 unsigned vector_elements = glsl_get_vector_elements(glsl_without_array(variable->type));
 260                 if (vector_elements)
 261                         num_components = vector_elements;
 262
 263                 unsigned gs_out_streams;
 264                 if (variable->data.stream & (1u << 31)) {
 265                         gs_out_streams = variable->data.stream & ~(1u << 31);
 266                 } else {
 267                         assert(variable->data.stream < 4);
 268                         gs_out_streams = 0;
 269                         for (unsigned j = 0; j < num_components; ++j)
 270                                 gs_out_streams |= variable->data.stream << (2 * (variable->data.location_frac + j));
 271                 }
 272
 273                 unsigned streamx = gs_out_streams & 3;
 274                 unsigned streamy = (gs_out_streams >> 2) & 3;
 275                 unsigned streamz = (gs_out_streams >> 4) & 3;
 276                 unsigned streamw = (gs_out_streams >> 6) & 3;
 277
 278                 if (info->output_usagemask[i] & TGSI_WRITEMASK_X) {
 279                         info->output_streams[i] |= streamx;
 280                         info->num_stream_output_components[streamx]++;
 281                 }
 282                 if (info->output_usagemask[i] & TGSI_WRITEMASK_Y) {
 283                         info->output_streams[i] |= streamy << 2;
 284                         info->num_stream_output_components[streamy]++;
 285                 }
 286                 if (info->output_usagemask[i] & TGSI_WRITEMASK_Z) {
 287                         info->output_streams[i] |= streamz << 4;
 288                         info->num_stream_output_components[streamz]++;
 289                 }
 290                 if (info->output_usagemask[i] & TGSI_WRITEMASK_W) {
 291                         info->output_streams[i] |= streamw << 6;
 292                         info->num_stream_output_components[streamw]++;
 293                 }
 294
 295                 switch (semantic_name) {
 296                 case TGSI_SEMANTIC_PRIMID:
 297                         info->writes_primid = true;
 298                         break;
 299                 case TGSI_SEMANTIC_VIEWPORT_INDEX:
 300                         info->writes_viewport_index = true;
 301                         break;
 302                 case TGSI_SEMANTIC_LAYER:
 303                         info->writes_layer = true;
 304                         break;
 305                 case TGSI_SEMANTIC_PSIZE:
 306                         info->writes_psize = true;
 307                         break;
 308                 case TGSI_SEMANTIC_CLIPVERTEX:
 309                         info->writes_clipvertex = true;
 310                         break;
 311                 case TGSI_SEMANTIC_COLOR:
 312                         info->colors_written |= 1 << semantic_index;
 313                         break;
 314                 case TGSI_SEMANTIC_STENCIL:
 315                         info->writes_stencil = true;
 316                         break;
 317                 case TGSI_SEMANTIC_SAMPLEMASK:
 318                         info->writes_samplemask = true;
 319                         break;
 320                 case TGSI_SEMANTIC_EDGEFLAG:
 321                         info->writes_edgeflag = true;
 322                         break;
 323                 case TGSI_SEMANTIC_POSITION:
 324                         if (info->processor == PIPE_SHADER_FRAGMENT)
 325                                 info->writes_z = true;
 326                         else
 327                                 info->writes_position = true;
 328                         break;
 329                 }
 330
 331                 i++;
 332         }
 333
 334         nir_foreach_variable(variable, &nir->uniforms) {
 335                 const struct glsl_type *type = variable->type;
 336                 enum glsl_base_type base_type =
 337                         glsl_get_base_type(glsl_without_array(type));
 338                 unsigned aoa_size = MAX2(1, glsl_get_aoa_size(type));
 339
 340                 /* We rely on the fact that nir_lower_samplers_as_deref has
 341                  * eliminated struct dereferences.
 342                  */
 343                 if (base_type == GLSL_TYPE_SAMPLER)
 344                         info->samplers_declared |=
 345                                 u_bit_consecutive(variable->data.binding, aoa_size);
 346                 else if (base_type == GLSL_TYPE_IMAGE)
 347                         info->images_declared |=
 348                                 u_bit_consecutive(variable->data.binding, aoa_size);
 349         }
 350
 351         info->num_written_clipdistance = nir->info.clip_distance_array_size;
 352         info->num_written_culldistance = nir->info.cull_distance_array_size;
 353         info->clipdist_writemask = u_bit_consecutive(0, info->num_written_clipdistance);
 354         info->culldist_writemask = u_bit_consecutive(0, info->num_written_culldistance);
 355
 356         if (info->processor == PIPE_SHADER_FRAGMENT)
 357                 info->uses_kill = nir->info.fs.uses_discard;
 358
 359         /* TODO make this more accurate */
 360         info->const_buffers_declared = u_bit_consecutive(0, SI_NUM_CONST_BUFFERS);
 361         info->shader_buffers_declared = u_bit_consecutive(0, SI_NUM_SHADER_BUFFERS);
 362
 363         func = (struct nir_function *)exec_list_get_head_const(&nir->functions);
 364         nir_foreach_block(block, func->impl) {
 365                 nir_foreach_instr(instr, block)
 366                         scan_instruction(info, instr);
 367         }
 368 }
 369
 370 /**
 371  * Perform "lowering" operations on the NIR that are run once when the shader
 372  * selector is created.
 373  */
 374 void
 375 si_lower_nir(struct si_shader_selector* sel)
 376 {
 377         /* Adjust the driver location of inputs and outputs. The state tracker
 378          * interprets them as slots, while the ac/nir backend interprets them
 379          * as individual components.
 380          */
 381         nir_foreach_variable(variable, &sel->nir->inputs)
 382                 variable->data.driver_location *= 4;
 383
 384         nir_foreach_variable(variable, &sel->nir->outputs) {
 385                 variable->data.driver_location *= 4;
 386
 387                 if (sel->nir->info.stage == MESA_SHADER_FRAGMENT) {
 388                         if (variable->data.location == FRAG_RESULT_DEPTH)
 389                                 variable->data.driver_location += 2;
 390                         else if (variable->data.location == FRAG_RESULT_STENCIL)
 391                                 variable->data.driver_location += 1;
 392                 }
 393         }
 394
 395         /* Perform lowerings (and optimizations) of code.
 396          *
 397          * Performance considerations aside, we must:
 398          * - lower certain ALU operations
 399          * - ensure constant offsets for texture instructions are folded
 400          *   and copy-propagated
 401          */
 402         NIR_PASS_V(sel->nir, nir_lower_io, nir_var_uniform, type_size,
 403                    (nir_lower_io_options)0);
 404         NIR_PASS_V(sel->nir, nir_lower_uniforms_to_ubo);
 405
 406         NIR_PASS_V(sel->nir, nir_lower_returns);
 407         NIR_PASS_V(sel->nir, nir_lower_vars_to_ssa);
 408         NIR_PASS_V(sel->nir, nir_lower_alu_to_scalar);
 409         NIR_PASS_V(sel->nir, nir_lower_phis_to_scalar);
 410
 411         static const struct nir_lower_tex_options lower_tex_options = {
 412                 .lower_txp = ~0u,
 413         };
 414         NIR_PASS_V(sel->nir, nir_lower_tex, &lower_tex_options);
 415
 416         bool progress;
 417         do {
 418                 progress = false;
 419
 420                 /* (Constant) copy propagation is needed for txf with offsets. */
 421                 NIR_PASS(progress, sel->nir, nir_copy_prop);
 422                 NIR_PASS(progress, sel->nir, nir_opt_remove_phis);
 423                 NIR_PASS(progress, sel->nir, nir_opt_dce);
 424                 if (nir_opt_trivial_continues(sel->nir)) {
 425                         progress = true;
 426                         NIR_PASS(progress, sel->nir, nir_copy_prop);
 427                         NIR_PASS(progress, sel->nir, nir_opt_dce);
 428                 }
 429                 NIR_PASS(progress, sel->nir, nir_opt_if);
 430                 NIR_PASS(progress, sel->nir, nir_opt_dead_cf);
 431                 NIR_PASS(progress, sel->nir, nir_opt_cse);
 432                 NIR_PASS(progress, sel->nir, nir_opt_peephole_select, 8);
 433
 434                 /* Needed for algebraic lowering */
 435                 NIR_PASS(progress, sel->nir, nir_opt_algebraic);
 436                 NIR_PASS(progress, sel->nir, nir_opt_constant_folding);
 437
 438                 NIR_PASS(progress, sel->nir, nir_opt_undef);
 439                 NIR_PASS(progress, sel->nir, nir_opt_conditional_discard);
 440                 if (sel->nir->options->max_unroll_iterations) {
 441                         NIR_PASS(progress, sel->nir, nir_opt_loop_unroll, 0);
 442                 }
 443         } while (progress);
 444 }
 445
 446 static void declare_nir_input_vs(struct si_shader_context *ctx,
 447                                  struct nir_variable *variable, unsigned rel,
 448                                  LLVMValueRef out[4])
 449 {
 450         si_llvm_load_input_vs(ctx, variable->data.driver_location / 4 + rel, out);
 451 }
 452
 453 static void declare_nir_input_fs(struct si_shader_context *ctx,
 454                                  struct nir_variable *variable, unsigned rel,
 455                                  unsigned *fs_attr_idx,
 456                                  LLVMValueRef out[4])
 457 {
 458         unsigned slot = variable->data.location + rel;
 459
 460         assert(variable->data.location >= VARYING_SLOT_VAR0 || rel == 0);
 461
 462         if (slot == VARYING_SLOT_POS) {
 463                 out[0] = LLVMGetParam(ctx->main_fn, SI_PARAM_POS_X_FLOAT);
 464                 out[1] = LLVMGetParam(ctx->main_fn, SI_PARAM_POS_Y_FLOAT);
 465                 out[2] = LLVMGetParam(ctx->main_fn, SI_PARAM_POS_Z_FLOAT);
 466                 out[3] = ac_build_fdiv(&ctx->ac, ctx->ac.f32_1,
 467                                 LLVMGetParam(ctx->main_fn, SI_PARAM_POS_W_FLOAT));
 468                 return;
 469         }
 470
 471         si_llvm_load_input_fs(ctx, *fs_attr_idx, out);
 472         (*fs_attr_idx)++;
 473 }
 474
 475 static LLVMValueRef
 476 si_nir_load_sampler_desc(struct ac_shader_abi *abi,
 477                          unsigned descriptor_set, unsigned base_index,
 478                          unsigned constant_index, LLVMValueRef dynamic_index,
 479                          enum ac_descriptor_type desc_type, bool image,
 480                          bool write)
 481 {
 482         struct si_shader_context *ctx = si_shader_context_from_abi(abi);
 483         LLVMBuilderRef builder = ctx->ac.builder;
 484         LLVMValueRef list = LLVMGetParam(ctx->main_fn, ctx->param_samplers_and_images);
 485         LLVMValueRef index = dynamic_index;
 486
 487         assert(!descriptor_set);
 488
 489         if (!index)
 490                 index = ctx->ac.i32_0;
 491
 492         index = LLVMBuildAdd(builder, index,
 493                              LLVMConstInt(ctx->ac.i32, base_index + constant_index, false),
 494                              "");
 495
 496         if (image) {
 497                 assert(desc_type == AC_DESC_IMAGE || desc_type == AC_DESC_BUFFER);
 498                 assert(base_index + constant_index < ctx->num_images);
 499
 500                 if (dynamic_index)
 501                         index = si_llvm_bound_index(ctx, index, ctx->num_images);
 502
 503                 index = LLVMBuildSub(ctx->gallivm.builder,
 504                                      LLVMConstInt(ctx->i32, SI_NUM_IMAGES - 1, 0),
 505                                      index, "");
 506
 507                 /* TODO: be smarter about when we use dcc_off */
 508                 return si_load_image_desc(ctx, list, index, desc_type, write);
 509         }
 510
 511         assert(base_index + constant_index < ctx->num_samplers);
 512
 513         if (dynamic_index)
 514                 index = si_llvm_bound_index(ctx, index, ctx->num_samplers);
 515
 516         index = LLVMBuildAdd(ctx->gallivm.builder, index,
 517                              LLVMConstInt(ctx->i32, SI_NUM_IMAGES / 2, 0), "");
 518
 519         return si_load_sampler_desc(ctx, list, index, desc_type);
 520 }
 521
 522 bool si_nir_build_llvm(struct si_shader_context *ctx, struct nir_shader *nir)
 523 {
 524         struct tgsi_shader_info *info = &ctx->shader->selector->info;
 525
 526         unsigned fs_attr_idx = 0;
 527         nir_foreach_variable(variable, &nir->inputs) {
 528                 unsigned attrib_count = glsl_count_attribute_slots(variable->type,
 529                                                                    nir->info.stage == MESA_SHADER_VERTEX);
 530                 unsigned input_idx = variable->data.driver_location;
 531
 532                 for (unsigned i = 0; i < attrib_count; ++i) {
 533                         LLVMValueRef data[4];
 534
 535                         if (nir->info.stage == MESA_SHADER_VERTEX)
 536                                 declare_nir_input_vs(ctx, variable, i, data);
 537                         else if (nir->info.stage == MESA_SHADER_FRAGMENT)
 538                                 declare_nir_input_fs(ctx, variable, i, &fs_attr_idx, data);
 539
 540                         for (unsigned chan = 0; chan < 4; chan++) {
 541                                 ctx->inputs[input_idx + chan] =
 542                                         LLVMBuildBitCast(ctx->ac.builder, data[chan], ctx->ac.i32, "");
 543                         }
 544                 }
 545         }
 546
 547         ctx->abi.inputs = &ctx->inputs[0];
 548         ctx->abi.load_sampler_desc = si_nir_load_sampler_desc;
 549         ctx->abi.clamp_shadow_reference = true;
 550
 551         ctx->num_samplers = util_last_bit(info->samplers_declared);
 552         ctx->num_images = util_last_bit(info->images_declared);
 553
 554         ac_nir_translate(&ctx->ac, &ctx->abi, nir, NULL);
 555
 556         return true;
 557 }