src/gallium/drivers/zink/nir_to_spirv/nir_to_spirv.c

   1 /*
   2  * Copyright 2018 Collabora Ltd.
   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 "nir_to_spirv.h"
  25 #include "spirv_builder.h"
  26
  27 #include "nir.h"
  28 #include "pipe/p_state.h"
  29 #include "util/u_memory.h"
  30 #include "util/hash_table.h"
  31
  32 struct ntv_context {
  33    struct spirv_builder builder;
  34
  35    SpvId GLSL_std_450;
  36
  37    gl_shader_stage stage;
  38
  39    SpvId ubos[128];
  40    size_t num_ubos;
  41    SpvId image_types[PIPE_MAX_SAMPLERS];
  42    SpvId samplers[PIPE_MAX_SAMPLERS];
  43    unsigned samplers_used : PIPE_MAX_SAMPLERS;
  44    SpvId entry_ifaces[PIPE_MAX_SHADER_INPUTS * 4 + PIPE_MAX_SHADER_OUTPUTS * 4];
  45    size_t num_entry_ifaces;
  46
  47    SpvId *defs;
  48    size_t num_defs;
  49
  50    SpvId *regs;
  51    size_t num_regs;
  52
  53    struct hash_table *vars; /* nir_variable -> SpvId */
  54
  55    const SpvId *block_ids;
  56    size_t num_blocks;
  57    bool block_started;
  58    SpvId loop_break, loop_cont;
  59
  60    SpvId front_face_var, instance_id_var, vertex_id_var;
  61 };
  62
  63 static SpvId
  64 get_fvec_constant(struct ntv_context *ctx, unsigned bit_size,
  65                   unsigned num_components, float value);
  66
  67 static SpvId
  68 get_uvec_constant(struct ntv_context *ctx, unsigned bit_size,
  69                   unsigned num_components, uint32_t value);
  70
  71 static SpvId
  72 get_ivec_constant(struct ntv_context *ctx, unsigned bit_size,
  73                   unsigned num_components, int32_t value);
  74
  75 static SpvId
  76 emit_unop(struct ntv_context *ctx, SpvOp op, SpvId type, SpvId src);
  77
  78 static SpvId
  79 emit_binop(struct ntv_context *ctx, SpvOp op, SpvId type,
  80            SpvId src0, SpvId src1);
  81
  82 static SpvId
  83 emit_triop(struct ntv_context *ctx, SpvOp op, SpvId type,
  84            SpvId src0, SpvId src1, SpvId src2);
  85
  86 static SpvId
  87 get_bvec_type(struct ntv_context *ctx, int num_components)
  88 {
  89    SpvId bool_type = spirv_builder_type_bool(&ctx->builder);
  90    if (num_components > 1)
  91       return spirv_builder_type_vector(&ctx->builder, bool_type,
  92                                        num_components);
  93
  94    assert(num_components == 1);
  95    return bool_type;
  96 }
  97
  98 static SpvId
  99 block_label(struct ntv_context *ctx, nir_block *block)
 100 {
 101    assert(block->index < ctx->num_blocks);
 102    return ctx->block_ids[block->index];
 103 }
 104
 105 static SpvId
 106 emit_float_const(struct ntv_context *ctx, int bit_size, float value)
 107 {
 108    assert(bit_size == 32);
 109    return spirv_builder_const_float(&ctx->builder, bit_size, value);
 110 }
 111
 112 static SpvId
 113 emit_uint_const(struct ntv_context *ctx, int bit_size, uint32_t value)
 114 {
 115    assert(bit_size == 32);
 116    return spirv_builder_const_uint(&ctx->builder, bit_size, value);
 117 }
 118
 119 static SpvId
 120 emit_int_const(struct ntv_context *ctx, int bit_size, int32_t value)
 121 {
 122    assert(bit_size == 32);
 123    return spirv_builder_const_int(&ctx->builder, bit_size, value);
 124 }
 125
 126 static SpvId
 127 get_fvec_type(struct ntv_context *ctx, unsigned bit_size, unsigned num_components)
 128 {
 129    assert(bit_size == 32); // only 32-bit floats supported so far
 130
 131    SpvId float_type = spirv_builder_type_float(&ctx->builder, bit_size);
 132    if (num_components > 1)
 133       return spirv_builder_type_vector(&ctx->builder, float_type,
 134                                        num_components);
 135
 136    assert(num_components == 1);
 137    return float_type;
 138 }
 139
 140 static SpvId
 141 get_ivec_type(struct ntv_context *ctx, unsigned bit_size, unsigned num_components)
 142 {
 143    assert(bit_size == 1 || bit_size == 32); // only 32-bit ints supported so far
 144
 145    SpvId int_type = spirv_builder_type_int(&ctx->builder, MAX2(bit_size, 32));
 146    if (num_components > 1)
 147       return spirv_builder_type_vector(&ctx->builder, int_type,
 148                                        num_components);
 149
 150    assert(num_components == 1);
 151    return int_type;
 152 }
 153
 154 static SpvId
 155 get_uvec_type(struct ntv_context *ctx, unsigned bit_size, unsigned num_components)
 156 {
 157    assert(bit_size == 1 || bit_size == 32); // only 32-bit uints supported so far
 158
 159    SpvId uint_type = spirv_builder_type_uint(&ctx->builder, MAX2(bit_size, 32));
 160    if (num_components > 1)
 161       return spirv_builder_type_vector(&ctx->builder, uint_type,
 162                                        num_components);
 163
 164    assert(num_components == 1);
 165    return uint_type;
 166 }
 167
 168 static SpvId
 169 get_dest_uvec_type(struct ntv_context *ctx, nir_dest *dest)
 170 {
 171    return get_uvec_type(ctx, nir_dest_bit_size(*dest),
 172                              nir_dest_num_components(*dest));
 173 }
 174
 175 static SpvId
 176 get_glsl_basetype(struct ntv_context *ctx, enum glsl_base_type type)
 177 {
 178    switch (type) {
 179    case GLSL_TYPE_BOOL:
 180       return spirv_builder_type_bool(&ctx->builder);
 181
 182    case GLSL_TYPE_FLOAT:
 183       return spirv_builder_type_float(&ctx->builder, 32);
 184
 185    case GLSL_TYPE_INT:
 186       return spirv_builder_type_int(&ctx->builder, 32);
 187
 188    case GLSL_TYPE_UINT:
 189       return spirv_builder_type_uint(&ctx->builder, 32);
 190    /* TODO: handle more types */
 191
 192    default:
 193       unreachable("unknown GLSL type");
 194    }
 195 }
 196
 197 static SpvId
 198 get_glsl_type(struct ntv_context *ctx, const struct glsl_type *type)
 199 {
 200    assert(type);
 201    if (glsl_type_is_scalar(type))
 202       return get_glsl_basetype(ctx, glsl_get_base_type(type));
 203
 204    if (glsl_type_is_vector(type))
 205       return spirv_builder_type_vector(&ctx->builder,
 206          get_glsl_basetype(ctx, glsl_get_base_type(type)),
 207          glsl_get_vector_elements(type));
 208
 209    if (glsl_type_is_array(type)) {
 210       SpvId ret = spirv_builder_type_array(&ctx->builder,
 211          get_glsl_type(ctx, glsl_get_array_element(type)),
 212          emit_uint_const(ctx, 32, glsl_get_length(type)));
 213       uint32_t stride = glsl_get_explicit_stride(type);
 214       if (stride)
 215          spirv_builder_emit_array_stride(&ctx->builder, ret, stride);
 216       return ret;
 217    }
 218
 219
 220    unreachable("we shouldn't get here, I think...");
 221 }
 222
 223 static void
 224 emit_input(struct ntv_context *ctx, struct nir_variable *var)
 225 {
 226    SpvId var_type = get_glsl_type(ctx, var->type);
 227    SpvId pointer_type = spirv_builder_type_pointer(&ctx->builder,
 228                                                    SpvStorageClassInput,
 229                                                    var_type);
 230    SpvId var_id = spirv_builder_emit_var(&ctx->builder, pointer_type,
 231                                          SpvStorageClassInput);
 232
 233    if (var->name)
 234       spirv_builder_emit_name(&ctx->builder, var_id, var->name);
 235
 236    if (ctx->stage == MESA_SHADER_FRAGMENT) {
 237       if (var->data.location >= VARYING_SLOT_VAR0)
 238          spirv_builder_emit_location(&ctx->builder, var_id,
 239                                      var->data.location -
 240                                      VARYING_SLOT_VAR0 +
 241                                      VARYING_SLOT_TEX0);
 242       else if ((var->data.location >= VARYING_SLOT_COL0 &&
 243                 var->data.location <= VARYING_SLOT_TEX7) ||
 244                var->data.location == VARYING_SLOT_BFC0 ||
 245                var->data.location == VARYING_SLOT_BFC1) {
 246          spirv_builder_emit_location(&ctx->builder, var_id,
 247                                      var->data.location);
 248       } else {
 249          switch (var->data.location) {
 250          case VARYING_SLOT_POS:
 251             spirv_builder_emit_builtin(&ctx->builder, var_id, SpvBuiltInFragCoord);
 252             break;
 253
 254          case VARYING_SLOT_PNTC:
 255             spirv_builder_emit_builtin(&ctx->builder, var_id, SpvBuiltInPointCoord);
 256             break;
 257
 258          default:
 259             debug_printf("unknown varying slot: %s\n", gl_varying_slot_name(var->data.location));
 260             unreachable("unexpected varying slot");
 261          }
 262       }
 263    } else {
 264       spirv_builder_emit_location(&ctx->builder, var_id,
 265                                   var->data.driver_location);
 266    }
 267
 268    if (var->data.location_frac)
 269       spirv_builder_emit_component(&ctx->builder, var_id,
 270                                    var->data.location_frac);
 271
 272    if (var->data.interpolation == INTERP_MODE_FLAT)
 273       spirv_builder_emit_decoration(&ctx->builder, var_id, SpvDecorationFlat);
 274
 275    _mesa_hash_table_insert(ctx->vars, var, (void *)(intptr_t)var_id);
 276
 277    assert(ctx->num_entry_ifaces < ARRAY_SIZE(ctx->entry_ifaces));
 278    ctx->entry_ifaces[ctx->num_entry_ifaces++] = var_id;
 279 }
 280
 281 static void
 282 emit_output(struct ntv_context *ctx, struct nir_variable *var)
 283 {
 284    SpvId var_type = get_glsl_type(ctx, var->type);
 285    SpvId pointer_type = spirv_builder_type_pointer(&ctx->builder,
 286                                                    SpvStorageClassOutput,
 287                                                    var_type);
 288    SpvId var_id = spirv_builder_emit_var(&ctx->builder, pointer_type,
 289                                          SpvStorageClassOutput);
 290    if (var->name)
 291       spirv_builder_emit_name(&ctx->builder, var_id, var->name);
 292
 293
 294    if (ctx->stage == MESA_SHADER_VERTEX) {
 295       if (var->data.location >= VARYING_SLOT_VAR0)
 296          spirv_builder_emit_location(&ctx->builder, var_id,
 297                                      var->data.location -
 298                                      VARYING_SLOT_VAR0 +
 299                                      VARYING_SLOT_TEX0);
 300       else if ((var->data.location >= VARYING_SLOT_COL0 &&
 301                 var->data.location <= VARYING_SLOT_TEX7) ||
 302                var->data.location == VARYING_SLOT_BFC0 ||
 303                var->data.location == VARYING_SLOT_BFC1) {
 304          spirv_builder_emit_location(&ctx->builder, var_id,
 305                                      var->data.location);
 306       } else {
 307          switch (var->data.location) {
 308          case VARYING_SLOT_POS:
 309             spirv_builder_emit_builtin(&ctx->builder, var_id, SpvBuiltInPosition);
 310             break;
 311
 312          case VARYING_SLOT_PSIZ:
 313             spirv_builder_emit_builtin(&ctx->builder, var_id, SpvBuiltInPointSize);
 314             break;
 315
 316          case VARYING_SLOT_CLIP_DIST0:
 317             assert(glsl_type_is_array(var->type));
 318             spirv_builder_emit_builtin(&ctx->builder, var_id, SpvBuiltInClipDistance);
 319             break;
 320
 321          default:
 322             debug_printf("unknown varying slot: %s\n", gl_varying_slot_name(var->data.location));
 323             unreachable("unexpected varying slot");
 324          }
 325       }
 326    } else if (ctx->stage == MESA_SHADER_FRAGMENT) {
 327       if (var->data.location >= FRAG_RESULT_DATA0)
 328          spirv_builder_emit_location(&ctx->builder, var_id,
 329                                      var->data.location - FRAG_RESULT_DATA0);
 330       else {
 331          switch (var->data.location) {
 332          case FRAG_RESULT_COLOR:
 333             spirv_builder_emit_location(&ctx->builder, var_id, 0);
 334             spirv_builder_emit_index(&ctx->builder, var_id, var->data.index);
 335             break;
 336
 337          case FRAG_RESULT_DEPTH:
 338             spirv_builder_emit_builtin(&ctx->builder, var_id, SpvBuiltInFragDepth);
 339             break;
 340
 341          default:
 342             spirv_builder_emit_location(&ctx->builder, var_id,
 343                                         var->data.driver_location);
 344          }
 345       }
 346    }
 347
 348    if (var->data.location_frac)
 349       spirv_builder_emit_component(&ctx->builder, var_id,
 350                                    var->data.location_frac);
 351
 352    _mesa_hash_table_insert(ctx->vars, var, (void *)(intptr_t)var_id);
 353
 354    assert(ctx->num_entry_ifaces < ARRAY_SIZE(ctx->entry_ifaces));
 355    ctx->entry_ifaces[ctx->num_entry_ifaces++] = var_id;
 356 }
 357
 358 static SpvDim
 359 type_to_dim(enum glsl_sampler_dim gdim, bool *is_ms)
 360 {
 361    *is_ms = false;
 362    switch (gdim) {
 363    case GLSL_SAMPLER_DIM_1D:
 364       return SpvDim1D;
 365    case GLSL_SAMPLER_DIM_2D:
 366       return SpvDim2D;
 367    case GLSL_SAMPLER_DIM_3D:
 368       return SpvDim3D;
 369    case GLSL_SAMPLER_DIM_CUBE:
 370       return SpvDimCube;
 371    case GLSL_SAMPLER_DIM_RECT:
 372       return SpvDim2D;
 373    case GLSL_SAMPLER_DIM_BUF:
 374       return SpvDimBuffer;
 375    case GLSL_SAMPLER_DIM_EXTERNAL:
 376       return SpvDim2D; /* seems dodgy... */
 377    case GLSL_SAMPLER_DIM_MS:
 378       *is_ms = true;
 379       return SpvDim2D;
 380    default:
 381       fprintf(stderr, "unknown sampler type %d\n", gdim);
 382       break;
 383    }
 384    return SpvDim2D;
 385 }
 386
 387 uint32_t
 388 zink_binding(gl_shader_stage stage, VkDescriptorType type, int index)
 389 {
 390    if (stage == MESA_SHADER_NONE ||
 391        stage >= MESA_SHADER_COMPUTE) {
 392       unreachable("not supported");
 393    } else {
 394       uint32_t stage_offset = (uint32_t)stage * (PIPE_MAX_CONSTANT_BUFFERS +
 395                                                  PIPE_MAX_SHADER_SAMPLER_VIEWS);
 396
 397       switch (type) {
 398       case VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER:
 399          assert(index < PIPE_MAX_CONSTANT_BUFFERS);
 400          return stage_offset + index;
 401
 402       case VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER:
 403          assert(index < PIPE_MAX_SHADER_SAMPLER_VIEWS);
 404          return stage_offset + PIPE_MAX_CONSTANT_BUFFERS + index;
 405
 406       default:
 407          unreachable("unexpected type");
 408       }
 409    }
 410 }
 411
 412 static void
 413 emit_sampler(struct ntv_context *ctx, struct nir_variable *var)
 414 {
 415    const struct glsl_type *type = glsl_without_array(var->type);
 416
 417    bool is_ms;
 418    SpvDim dimension = type_to_dim(glsl_get_sampler_dim(type), &is_ms);
 419
 420    SpvId result_type = get_glsl_basetype(ctx, glsl_get_sampler_result_type(type));
 421    SpvId image_type = spirv_builder_type_image(&ctx->builder, result_type,
 422                                                dimension, false,
 423                                                glsl_sampler_type_is_array(type),
 424                                                is_ms, 1,
 425                                                SpvImageFormatUnknown);
 426
 427    SpvId sampled_type = spirv_builder_type_sampled_image(&ctx->builder,
 428                                                          image_type);
 429    SpvId pointer_type = spirv_builder_type_pointer(&ctx->builder,
 430                                                    SpvStorageClassUniformConstant,
 431                                                    sampled_type);
 432
 433    if (glsl_type_is_array(var->type)) {
 434       for (int i = 0; i < glsl_get_length(var->type); ++i) {
 435          SpvId var_id = spirv_builder_emit_var(&ctx->builder, pointer_type,
 436                                                SpvStorageClassUniformConstant);
 437
 438          if (var->name) {
 439             char element_name[100];
 440             snprintf(element_name, sizeof(element_name), "%s_%d", var->name, i);
 441             spirv_builder_emit_name(&ctx->builder, var_id, var->name);
 442          }
 443
 444          int index = var->data.binding + i;
 445          assert(!(ctx->samplers_used & (1 << index)));
 446          assert(!ctx->image_types[index]);
 447          ctx->image_types[index] = image_type;
 448          ctx->samplers[index] = var_id;
 449          ctx->samplers_used |= 1 << index;
 450
 451          spirv_builder_emit_descriptor_set(&ctx->builder, var_id,
 452                                            var->data.descriptor_set);
 453          int binding = zink_binding(ctx->stage,
 454                                     VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
 455                                     var->data.binding + i);
 456          spirv_builder_emit_binding(&ctx->builder, var_id, binding);
 457       }
 458    } else {
 459       SpvId var_id = spirv_builder_emit_var(&ctx->builder, pointer_type,
 460                                             SpvStorageClassUniformConstant);
 461
 462       if (var->name)
 463          spirv_builder_emit_name(&ctx->builder, var_id, var->name);
 464
 465       int index = var->data.binding;
 466       assert(!(ctx->samplers_used & (1 << index)));
 467       assert(!ctx->image_types[index]);
 468       ctx->image_types[index] = image_type;
 469       ctx->samplers[index] = var_id;
 470       ctx->samplers_used |= 1 << index;
 471
 472       spirv_builder_emit_descriptor_set(&ctx->builder, var_id,
 473                                         var->data.descriptor_set);
 474       int binding = zink_binding(ctx->stage,
 475                                  VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
 476                                  var->data.binding);
 477       spirv_builder_emit_binding(&ctx->builder, var_id, binding);
 478    }
 479 }
 480
 481 static void
 482 emit_ubo(struct ntv_context *ctx, struct nir_variable *var)
 483 {
 484    uint32_t size = glsl_count_attribute_slots(var->type, false);
 485    SpvId vec4_type = get_uvec_type(ctx, 32, 4);
 486    SpvId array_length = emit_uint_const(ctx, 32, size);
 487    SpvId array_type = spirv_builder_type_array(&ctx->builder, vec4_type,
 488                                                array_length);
 489    spirv_builder_emit_array_stride(&ctx->builder, array_type, 16);
 490
 491    // wrap UBO-array in a struct
 492    SpvId struct_type = spirv_builder_type_struct(&ctx->builder, &array_type, 1);
 493    if (var->name) {
 494       char struct_name[100];
 495       snprintf(struct_name, sizeof(struct_name), "struct_%s", var->name);
 496       spirv_builder_emit_name(&ctx->builder, struct_type, struct_name);
 497    }
 498
 499    spirv_builder_emit_decoration(&ctx->builder, struct_type,
 500                                  SpvDecorationBlock);
 501    spirv_builder_emit_member_offset(&ctx->builder, struct_type, 0, 0);
 502
 503
 504    SpvId pointer_type = spirv_builder_type_pointer(&ctx->builder,
 505                                                    SpvStorageClassUniform,
 506                                                    struct_type);
 507
 508    SpvId var_id = spirv_builder_emit_var(&ctx->builder, pointer_type,
 509                                          SpvStorageClassUniform);
 510    if (var->name)
 511       spirv_builder_emit_name(&ctx->builder, var_id, var->name);
 512
 513    assert(ctx->num_ubos < ARRAY_SIZE(ctx->ubos));
 514    ctx->ubos[ctx->num_ubos++] = var_id;
 515
 516    spirv_builder_emit_descriptor_set(&ctx->builder, var_id,
 517                                      var->data.descriptor_set);
 518    int binding = zink_binding(ctx->stage,
 519                               VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
 520                               var->data.binding);
 521    spirv_builder_emit_binding(&ctx->builder, var_id, binding);
 522 }
 523
 524 static void
 525 emit_uniform(struct ntv_context *ctx, struct nir_variable *var)
 526 {
 527    if (var->data.mode == nir_var_mem_ubo)
 528       emit_ubo(ctx, var);
 529    else {
 530       assert(var->data.mode == nir_var_uniform);
 531       if (glsl_type_is_sampler(glsl_without_array(var->type)))
 532          emit_sampler(ctx, var);
 533    }
 534 }
 535
 536 static SpvId
 537 get_src_uint_ssa(struct ntv_context *ctx, const nir_ssa_def *ssa)
 538 {
 539    assert(ssa->index < ctx->num_defs);
 540    assert(ctx->defs[ssa->index] != 0);
 541    return ctx->defs[ssa->index];
 542 }
 543
 544 static SpvId
 545 get_var_from_reg(struct ntv_context *ctx, nir_register *reg)
 546 {
 547    assert(reg->index < ctx->num_regs);
 548    assert(ctx->regs[reg->index] != 0);
 549    return ctx->regs[reg->index];
 550 }
 551
 552 static SpvId
 553 get_src_uint_reg(struct ntv_context *ctx, const nir_reg_src *reg)
 554 {
 555    assert(reg->reg);
 556    assert(!reg->indirect);
 557    assert(!reg->base_offset);
 558
 559    SpvId var = get_var_from_reg(ctx, reg->reg);
 560    SpvId type = get_uvec_type(ctx, reg->reg->bit_size, reg->reg->num_components);
 561    return spirv_builder_emit_load(&ctx->builder, type, var);
 562 }
 563
 564 static SpvId
 565 get_src_uint(struct ntv_context *ctx, nir_src *src)
 566 {
 567    if (src->is_ssa)
 568       return get_src_uint_ssa(ctx, src->ssa);
 569    else
 570       return get_src_uint_reg(ctx, &src->reg);
 571 }
 572
 573 static SpvId
 574 get_alu_src_uint(struct ntv_context *ctx, nir_alu_instr *alu, unsigned src)
 575 {
 576    assert(!alu->src[src].negate);
 577    assert(!alu->src[src].abs);
 578
 579    SpvId def = get_src_uint(ctx, &alu->src[src].src);
 580
 581    unsigned used_channels = 0;
 582    bool need_swizzle = false;
 583    for (unsigned i = 0; i < NIR_MAX_VEC_COMPONENTS; i++) {
 584       if (!nir_alu_instr_channel_used(alu, src, i))
 585          continue;
 586
 587       used_channels++;
 588
 589       if (alu->src[src].swizzle[i] != i)
 590          need_swizzle = true;
 591    }
 592    assert(used_channels != 0);
 593
 594    unsigned live_channels = nir_src_num_components(alu->src[src].src);
 595    if (used_channels != live_channels)
 596       need_swizzle = true;
 597
 598    if (!need_swizzle)
 599       return def;
 600
 601    int bit_size = nir_src_bit_size(alu->src[src].src);
 602    assert(bit_size == 1 || bit_size == 32);
 603
 604    SpvId uint_type = spirv_builder_type_uint(&ctx->builder, MAX2(bit_size, 32));
 605    if (used_channels == 1) {
 606       uint32_t indices[] =  { alu->src[src].swizzle[0] };
 607       return spirv_builder_emit_composite_extract(&ctx->builder, uint_type,
 608                                                   def, indices,
 609                                                   ARRAY_SIZE(indices));
 610    } else if (live_channels == 1) {
 611       SpvId uvec_type = spirv_builder_type_vector(&ctx->builder, uint_type,
 612                                                   used_channels);
 613
 614       SpvId constituents[NIR_MAX_VEC_COMPONENTS];
 615       for (unsigned i = 0; i < used_channels; ++i)
 616         constituents[i] = def;
 617
 618       return spirv_builder_emit_composite_construct(&ctx->builder, uvec_type,
 619                                                     constituents,
 620                                                     used_channels);
 621    } else {
 622       SpvId uvec_type = spirv_builder_type_vector(&ctx->builder, uint_type,
 623                                                   used_channels);
 624
 625       uint32_t components[NIR_MAX_VEC_COMPONENTS];
 626       size_t num_components = 0;
 627       for (unsigned i = 0; i < NIR_MAX_VEC_COMPONENTS; i++) {
 628          if (!nir_alu_instr_channel_used(alu, src, i))
 629             continue;
 630
 631          components[num_components++] = alu->src[src].swizzle[i];
 632       }
 633
 634       return spirv_builder_emit_vector_shuffle(&ctx->builder, uvec_type,
 635                                         def, def, components, num_components);
 636    }
 637 }
 638
 639 static void
 640 store_ssa_def_uint(struct ntv_context *ctx, nir_ssa_def *ssa, SpvId result)
 641 {
 642    assert(result != 0);
 643    assert(ssa->index < ctx->num_defs);
 644    ctx->defs[ssa->index] = result;
 645 }
 646
 647 static SpvId
 648 emit_select(struct ntv_context *ctx, SpvId type, SpvId cond,
 649             SpvId if_true, SpvId if_false)
 650 {
 651    return emit_triop(ctx, SpvOpSelect, type, cond, if_true, if_false);
 652 }
 653
 654 static SpvId
 655 bvec_to_uvec(struct ntv_context *ctx, SpvId value, unsigned num_components)
 656 {
 657    SpvId otype = get_uvec_type(ctx, 32, num_components);
 658    SpvId zero = get_uvec_constant(ctx, 32, num_components, 0);
 659    SpvId one = get_uvec_constant(ctx, 32, num_components, UINT32_MAX);
 660    return emit_select(ctx, otype, value, one, zero);
 661 }
 662
 663 static SpvId
 664 uvec_to_bvec(struct ntv_context *ctx, SpvId value, unsigned num_components)
 665 {
 666    SpvId type = get_bvec_type(ctx, num_components);
 667    SpvId zero = get_uvec_constant(ctx, 32, num_components, 0);
 668    return emit_binop(ctx, SpvOpINotEqual, type, value, zero);
 669 }
 670
 671 static SpvId
 672 emit_bitcast(struct ntv_context *ctx, SpvId type, SpvId value)
 673 {
 674    return emit_unop(ctx, SpvOpBitcast, type, value);
 675 }
 676
 677 static SpvId
 678 bitcast_to_uvec(struct ntv_context *ctx, SpvId value, unsigned bit_size,
 679                 unsigned num_components)
 680 {
 681    SpvId type = get_uvec_type(ctx, bit_size, num_components);
 682    return emit_bitcast(ctx, type, value);
 683 }
 684
 685 static SpvId
 686 bitcast_to_ivec(struct ntv_context *ctx, SpvId value, unsigned bit_size,
 687                 unsigned num_components)
 688 {
 689    SpvId type = get_ivec_type(ctx, bit_size, num_components);
 690    return emit_bitcast(ctx, type, value);
 691 }
 692
 693 static SpvId
 694 bitcast_to_fvec(struct ntv_context *ctx, SpvId value, unsigned bit_size,
 695                unsigned num_components)
 696 {
 697    SpvId type = get_fvec_type(ctx, bit_size, num_components);
 698    return emit_bitcast(ctx, type, value);
 699 }
 700
 701 static void
 702 store_reg_def(struct ntv_context *ctx, nir_reg_dest *reg, SpvId result)
 703 {
 704    SpvId var = get_var_from_reg(ctx, reg->reg);
 705    assert(var);
 706    spirv_builder_emit_store(&ctx->builder, var, result);
 707 }
 708
 709 static void
 710 store_dest_uint(struct ntv_context *ctx, nir_dest *dest, SpvId result)
 711 {
 712    if (dest->is_ssa)
 713       store_ssa_def_uint(ctx, &dest->ssa, result);
 714    else
 715       store_reg_def(ctx, &dest->reg, result);
 716 }
 717
 718 static void
 719 store_dest(struct ntv_context *ctx, nir_dest *dest, SpvId result, nir_alu_type type)
 720 {
 721    unsigned num_components = nir_dest_num_components(*dest);
 722    unsigned bit_size = nir_dest_bit_size(*dest);
 723
 724    switch (nir_alu_type_get_base_type(type)) {
 725    case nir_type_bool:
 726       assert(bit_size == 1);
 727       result = bvec_to_uvec(ctx, result, num_components);
 728       break;
 729
 730    case nir_type_uint:
 731       break; /* nothing to do! */
 732
 733    case nir_type_int:
 734    case nir_type_float:
 735       result = bitcast_to_uvec(ctx, result, bit_size, num_components);
 736       break;
 737
 738    default:
 739       unreachable("unsupported nir_alu_type");
 740    }
 741
 742    store_dest_uint(ctx, dest, result);
 743 }
 744
 745 static SpvId
 746 emit_unop(struct ntv_context *ctx, SpvOp op, SpvId type, SpvId src)
 747 {
 748    return spirv_builder_emit_unop(&ctx->builder, op, type, src);
 749 }
 750
 751 static SpvId
 752 emit_binop(struct ntv_context *ctx, SpvOp op, SpvId type,
 753            SpvId src0, SpvId src1)
 754 {
 755    return spirv_builder_emit_binop(&ctx->builder, op, type, src0, src1);
 756 }
 757
 758 static SpvId
 759 emit_triop(struct ntv_context *ctx, SpvOp op, SpvId type,
 760            SpvId src0, SpvId src1, SpvId src2)
 761 {
 762    return spirv_builder_emit_triop(&ctx->builder, op, type, src0, src1, src2);
 763 }
 764
 765 static SpvId
 766 emit_builtin_unop(struct ntv_context *ctx, enum GLSLstd450 op, SpvId type,
 767                   SpvId src)
 768 {
 769    SpvId args[] = { src };
 770    return spirv_builder_emit_ext_inst(&ctx->builder, type, ctx->GLSL_std_450,
 771                                       op, args, ARRAY_SIZE(args));
 772 }
 773
 774 static SpvId
 775 emit_builtin_binop(struct ntv_context *ctx, enum GLSLstd450 op, SpvId type,
 776                    SpvId src0, SpvId src1)
 777 {
 778    SpvId args[] = { src0, src1 };
 779    return spirv_builder_emit_ext_inst(&ctx->builder, type, ctx->GLSL_std_450,
 780                                       op, args, ARRAY_SIZE(args));
 781 }
 782
 783 static SpvId
 784 emit_builtin_triop(struct ntv_context *ctx, enum GLSLstd450 op, SpvId type,
 785                    SpvId src0, SpvId src1, SpvId src2)
 786 {
 787    SpvId args[] = { src0, src1, src2 };
 788    return spirv_builder_emit_ext_inst(&ctx->builder, type, ctx->GLSL_std_450,
 789                                       op, args, ARRAY_SIZE(args));
 790 }
 791
 792 static SpvId
 793 get_fvec_constant(struct ntv_context *ctx, unsigned bit_size,
 794                   unsigned num_components, float value)
 795 {
 796    assert(bit_size == 32);
 797
 798    SpvId result = emit_float_const(ctx, bit_size, value);
 799    if (num_components == 1)
 800       return result;
 801
 802    assert(num_components > 1);
 803    SpvId components[num_components];
 804    for (int i = 0; i < num_components; i++)
 805       components[i] = result;
 806
 807    SpvId type = get_fvec_type(ctx, bit_size, num_components);
 808    return spirv_builder_const_composite(&ctx->builder, type, components,
 809                                         num_components);
 810 }
 811
 812 static SpvId
 813 get_uvec_constant(struct ntv_context *ctx, unsigned bit_size,
 814                   unsigned num_components, uint32_t value)
 815 {
 816    assert(bit_size == 32);
 817
 818    SpvId result = emit_uint_const(ctx, bit_size, value);
 819    if (num_components == 1)
 820       return result;
 821
 822    assert(num_components > 1);
 823    SpvId components[num_components];
 824    for (int i = 0; i < num_components; i++)
 825       components[i] = result;
 826
 827    SpvId type = get_uvec_type(ctx, bit_size, num_components);
 828    return spirv_builder_const_composite(&ctx->builder, type, components,
 829                                         num_components);
 830 }
 831
 832 static SpvId
 833 get_ivec_constant(struct ntv_context *ctx, unsigned bit_size,
 834                   unsigned num_components, int32_t value)
 835 {
 836    assert(bit_size == 32);
 837
 838    SpvId result = emit_int_const(ctx, bit_size, value);
 839    if (num_components == 1)
 840       return result;
 841
 842    assert(num_components > 1);
 843    SpvId components[num_components];
 844    for (int i = 0; i < num_components; i++)
 845       components[i] = result;
 846
 847    SpvId type = get_ivec_type(ctx, bit_size, num_components);
 848    return spirv_builder_const_composite(&ctx->builder, type, components,
 849                                         num_components);
 850 }
 851
 852 static inline unsigned
 853 alu_instr_src_components(const nir_alu_instr *instr, unsigned src)
 854 {
 855    if (nir_op_infos[instr->op].input_sizes[src] > 0)
 856       return nir_op_infos[instr->op].input_sizes[src];
 857
 858    if (instr->dest.dest.is_ssa)
 859       return instr->dest.dest.ssa.num_components;
 860    else
 861       return instr->dest.dest.reg.reg->num_components;
 862 }
 863
 864 static SpvId
 865 get_alu_src(struct ntv_context *ctx, nir_alu_instr *alu, unsigned src)
 866 {
 867    SpvId uint_value = get_alu_src_uint(ctx, alu, src);
 868
 869    unsigned num_components = alu_instr_src_components(alu, src);
 870    unsigned bit_size = nir_src_bit_size(alu->src[src].src);
 871    nir_alu_type type = nir_op_infos[alu->op].input_types[src];
 872
 873    switch (nir_alu_type_get_base_type(type)) {
 874    case nir_type_bool:
 875       assert(bit_size == 1);
 876       return uvec_to_bvec(ctx, uint_value, num_components);
 877
 878    case nir_type_int:
 879       return bitcast_to_ivec(ctx, uint_value, bit_size, num_components);
 880
 881    case nir_type_uint:
 882       return uint_value;
 883
 884    case nir_type_float:
 885       return bitcast_to_fvec(ctx, uint_value, bit_size, num_components);
 886
 887    default:
 888       unreachable("unknown nir_alu_type");
 889    }
 890 }
 891
 892 static void
 893 store_alu_result(struct ntv_context *ctx, nir_alu_instr *alu, SpvId result)
 894 {
 895    assert(!alu->dest.saturate);
 896    return store_dest(ctx, &alu->dest.dest, result, nir_op_infos[alu->op].output_type);
 897 }
 898
 899 static SpvId
 900 get_dest_type(struct ntv_context *ctx, nir_dest *dest, nir_alu_type type)
 901 {
 902    unsigned num_components = nir_dest_num_components(*dest);
 903    unsigned bit_size = nir_dest_bit_size(*dest);
 904
 905    switch (nir_alu_type_get_base_type(type)) {
 906    case nir_type_bool:
 907       return get_bvec_type(ctx, num_components);
 908
 909    case nir_type_int:
 910       return get_ivec_type(ctx, bit_size, num_components);
 911
 912    case nir_type_uint:
 913       return get_uvec_type(ctx, bit_size, num_components);
 914
 915    case nir_type_float:
 916       return get_fvec_type(ctx, bit_size, num_components);
 917
 918    default:
 919       unreachable("unsupported nir_alu_type");
 920    }
 921 }
 922
 923 static void
 924 emit_alu(struct ntv_context *ctx, nir_alu_instr *alu)
 925 {
 926    SpvId src[nir_op_infos[alu->op].num_inputs];
 927    for (unsigned i = 0; i < nir_op_infos[alu->op].num_inputs; i++)
 928       src[i] = get_alu_src(ctx, alu, i);
 929
 930    SpvId dest_type = get_dest_type(ctx, &alu->dest.dest,
 931                                    nir_op_infos[alu->op].output_type);
 932    unsigned bit_size = nir_dest_bit_size(alu->dest.dest);
 933    unsigned num_components = nir_dest_num_components(alu->dest.dest);
 934
 935    SpvId result = 0;
 936    switch (alu->op) {
 937    case nir_op_mov:
 938       assert(nir_op_infos[alu->op].num_inputs == 1);
 939       result = src[0];
 940       break;
 941
 942 #define UNOP(nir_op, spirv_op) \
 943    case nir_op: \
 944       assert(nir_op_infos[alu->op].num_inputs == 1); \
 945       result = emit_unop(ctx, spirv_op, dest_type, src[0]); \
 946       break;
 947
 948    UNOP(nir_op_ineg, SpvOpSNegate)
 949    UNOP(nir_op_fneg, SpvOpFNegate)
 950    UNOP(nir_op_fddx, SpvOpDPdx)
 951    UNOP(nir_op_fddx_coarse, SpvOpDPdxCoarse)
 952    UNOP(nir_op_fddx_fine, SpvOpDPdxFine)
 953    UNOP(nir_op_fddy, SpvOpDPdy)
 954    UNOP(nir_op_fddy_coarse, SpvOpDPdyCoarse)
 955    UNOP(nir_op_fddy_fine, SpvOpDPdyFine)
 956    UNOP(nir_op_f2i32, SpvOpConvertFToS)
 957    UNOP(nir_op_f2u32, SpvOpConvertFToU)
 958    UNOP(nir_op_i2f32, SpvOpConvertSToF)
 959    UNOP(nir_op_u2f32, SpvOpConvertUToF)
 960    UNOP(nir_op_inot, SpvOpNot)
 961 #undef UNOP
 962
 963    case nir_op_b2i32:
 964       assert(nir_op_infos[alu->op].num_inputs == 1);
 965       result = emit_select(ctx, dest_type, src[0],
 966                            get_ivec_constant(ctx, 32, num_components, 1),
 967                            get_ivec_constant(ctx, 32, num_components, 0));
 968       break;
 969
 970    case nir_op_b2f32:
 971       assert(nir_op_infos[alu->op].num_inputs == 1);
 972       result = emit_select(ctx, dest_type, src[0],
 973                            get_fvec_constant(ctx, 32, num_components, 1),
 974                            get_fvec_constant(ctx, 32, num_components, 0));
 975       break;
 976
 977 #define BUILTIN_UNOP(nir_op, spirv_op) \
 978    case nir_op: \
 979       assert(nir_op_infos[alu->op].num_inputs == 1); \
 980       result = emit_builtin_unop(ctx, spirv_op, dest_type, src[0]); \
 981       break;
 982
 983    BUILTIN_UNOP(nir_op_iabs, GLSLstd450SAbs)
 984    BUILTIN_UNOP(nir_op_fabs, GLSLstd450FAbs)
 985    BUILTIN_UNOP(nir_op_fsqrt, GLSLstd450Sqrt)
 986    BUILTIN_UNOP(nir_op_frsq, GLSLstd450InverseSqrt)
 987    BUILTIN_UNOP(nir_op_flog2, GLSLstd450Log2)
 988    BUILTIN_UNOP(nir_op_fexp2, GLSLstd450Exp2)
 989    BUILTIN_UNOP(nir_op_ffract, GLSLstd450Fract)
 990    BUILTIN_UNOP(nir_op_ffloor, GLSLstd450Floor)
 991    BUILTIN_UNOP(nir_op_fceil, GLSLstd450Ceil)
 992    BUILTIN_UNOP(nir_op_ftrunc, GLSLstd450Trunc)
 993    BUILTIN_UNOP(nir_op_fround_even, GLSLstd450RoundEven)
 994    BUILTIN_UNOP(nir_op_fsign, GLSLstd450FSign)
 995    BUILTIN_UNOP(nir_op_fsin, GLSLstd450Sin)
 996    BUILTIN_UNOP(nir_op_fcos, GLSLstd450Cos)
 997 #undef BUILTIN_UNOP
 998
 999    case nir_op_frcp:
1000       assert(nir_op_infos[alu->op].num_inputs == 1);
1001       result = emit_binop(ctx, SpvOpFDiv, dest_type,
1002                           get_fvec_constant(ctx, bit_size, num_components, 1),
1003                           src[0]);
1004       break;
1005
1006    case nir_op_f2b1:
1007       assert(nir_op_infos[alu->op].num_inputs == 1);
1008       result = emit_binop(ctx, SpvOpFOrdNotEqual, dest_type, src[0],
1009                           get_fvec_constant(ctx,
1010                                             nir_src_bit_size(alu->src[0].src),
1011                                             num_components, 0));
1012       break;
1013
1014
1015 #define BINOP(nir_op, spirv_op) \
1016    case nir_op: \
1017       assert(nir_op_infos[alu->op].num_inputs == 2); \
1018       result = emit_binop(ctx, spirv_op, dest_type, src[0], src[1]); \
1019       break;
1020
1021    BINOP(nir_op_iadd, SpvOpIAdd)
1022    BINOP(nir_op_isub, SpvOpISub)
1023    BINOP(nir_op_imul, SpvOpIMul)
1024    BINOP(nir_op_idiv, SpvOpSDiv)
1025    BINOP(nir_op_udiv, SpvOpUDiv)
1026    BINOP(nir_op_umod, SpvOpUMod)
1027    BINOP(nir_op_fadd, SpvOpFAdd)
1028    BINOP(nir_op_fsub, SpvOpFSub)
1029    BINOP(nir_op_fmul, SpvOpFMul)
1030    BINOP(nir_op_fdiv, SpvOpFDiv)
1031    BINOP(nir_op_fmod, SpvOpFMod)
1032    BINOP(nir_op_ilt, SpvOpSLessThan)
1033    BINOP(nir_op_ige, SpvOpSGreaterThanEqual)
1034    BINOP(nir_op_ieq, SpvOpIEqual)
1035    BINOP(nir_op_ine, SpvOpINotEqual)
1036    BINOP(nir_op_uge, SpvOpUGreaterThanEqual)
1037    BINOP(nir_op_flt, SpvOpFOrdLessThan)
1038    BINOP(nir_op_fge, SpvOpFOrdGreaterThanEqual)
1039    BINOP(nir_op_feq, SpvOpFOrdEqual)
1040    BINOP(nir_op_fne, SpvOpFOrdNotEqual)
1041    BINOP(nir_op_ishl, SpvOpShiftLeftLogical)
1042    BINOP(nir_op_ishr, SpvOpShiftRightArithmetic)
1043    BINOP(nir_op_ushr, SpvOpShiftRightLogical)
1044    BINOP(nir_op_iand, SpvOpBitwiseAnd)
1045    BINOP(nir_op_ior, SpvOpBitwiseOr)
1046 #undef BINOP
1047
1048 #define BUILTIN_BINOP(nir_op, spirv_op) \
1049    case nir_op: \
1050       assert(nir_op_infos[alu->op].num_inputs == 2); \
1051       result = emit_builtin_binop(ctx, spirv_op, dest_type, src[0], src[1]); \
1052       break;
1053
1054    BUILTIN_BINOP(nir_op_fmin, GLSLstd450FMin)
1055    BUILTIN_BINOP(nir_op_fmax, GLSLstd450FMax)
1056 #undef BUILTIN_BINOP
1057
1058    case nir_op_fdot2:
1059    case nir_op_fdot3:
1060    case nir_op_fdot4:
1061       assert(nir_op_infos[alu->op].num_inputs == 2);
1062       result = emit_binop(ctx, SpvOpDot, dest_type, src[0], src[1]);
1063       break;
1064
1065    case nir_op_fdph:
1066       unreachable("should already be lowered away");
1067
1068    case nir_op_seq:
1069    case nir_op_sne:
1070    case nir_op_slt:
1071    case nir_op_sge: {
1072       assert(nir_op_infos[alu->op].num_inputs == 2);
1073       int num_components = nir_dest_num_components(alu->dest.dest);
1074       SpvId bool_type = get_bvec_type(ctx, num_components);
1075
1076       SpvId zero = emit_float_const(ctx, bit_size, 0.0f);
1077       SpvId one = emit_float_const(ctx, bit_size, 1.0f);
1078       if (num_components > 1) {
1079          SpvId zero_comps[num_components], one_comps[num_components];
1080          for (int i = 0; i < num_components; i++) {
1081             zero_comps[i] = zero;
1082             one_comps[i] = one;
1083          }
1084
1085          zero = spirv_builder_const_composite(&ctx->builder, dest_type,
1086                                               zero_comps, num_components);
1087          one = spirv_builder_const_composite(&ctx->builder, dest_type,
1088                                              one_comps, num_components);
1089       }
1090
1091       SpvOp op;
1092       switch (alu->op) {
1093       case nir_op_seq: op = SpvOpFOrdEqual; break;
1094       case nir_op_sne: op = SpvOpFOrdNotEqual; break;
1095       case nir_op_slt: op = SpvOpFOrdLessThan; break;
1096       case nir_op_sge: op = SpvOpFOrdGreaterThanEqual; break;
1097       default: unreachable("unexpected op");
1098       }
1099
1100       result = emit_binop(ctx, op, bool_type, src[0], src[1]);
1101       result = emit_select(ctx, dest_type, result, one, zero);
1102       }
1103       break;
1104
1105    case nir_op_flrp:
1106       assert(nir_op_infos[alu->op].num_inputs == 3);
1107       result = emit_builtin_triop(ctx, GLSLstd450FMix, dest_type,
1108                                   src[0], src[1], src[2]);
1109       break;
1110
1111    case nir_op_fcsel:
1112       result = emit_binop(ctx, SpvOpFOrdGreaterThan,
1113                           get_bvec_type(ctx, num_components),
1114                           src[0],
1115                           get_fvec_constant(ctx,
1116                                             nir_src_bit_size(alu->src[0].src),
1117                                             num_components, 0));
1118       result = emit_select(ctx, dest_type, result, src[1], src[2]);
1119       break;
1120
1121    case nir_op_bcsel:
1122       assert(nir_op_infos[alu->op].num_inputs == 3);
1123       result = emit_select(ctx, dest_type, src[0], src[1], src[2]);
1124       break;
1125
1126    case nir_op_bany_fnequal2:
1127    case nir_op_bany_fnequal3:
1128    case nir_op_bany_fnequal4:
1129       assert(nir_op_infos[alu->op].num_inputs == 2);
1130       assert(alu_instr_src_components(alu, 0) ==
1131              alu_instr_src_components(alu, 1));
1132       result = emit_binop(ctx, SpvOpFOrdNotEqual,
1133                           get_bvec_type(ctx, alu_instr_src_components(alu, 0)),
1134                           src[0], src[1]);
1135       result = emit_unop(ctx, SpvOpAny, dest_type, result);
1136       break;
1137
1138    case nir_op_ball_fequal2:
1139    case nir_op_ball_fequal3:
1140    case nir_op_ball_fequal4:
1141       assert(nir_op_infos[alu->op].num_inputs == 2);
1142       assert(alu_instr_src_components(alu, 0) ==
1143              alu_instr_src_components(alu, 1));
1144       result = emit_binop(ctx, SpvOpFOrdEqual,
1145                           get_bvec_type(ctx, alu_instr_src_components(alu, 0)),
1146                           src[0], src[1]);
1147       result = emit_unop(ctx, SpvOpAll, dest_type, result);
1148       break;
1149
1150    case nir_op_bany_inequal2:
1151    case nir_op_bany_inequal3:
1152    case nir_op_bany_inequal4:
1153       assert(nir_op_infos[alu->op].num_inputs == 2);
1154       assert(alu_instr_src_components(alu, 0) ==
1155              alu_instr_src_components(alu, 1));
1156       result = emit_binop(ctx, SpvOpINotEqual,
1157                           get_bvec_type(ctx, alu_instr_src_components(alu, 0)),
1158                           src[0], src[1]);
1159       result = emit_unop(ctx, SpvOpAny, dest_type, result);
1160       break;
1161
1162    case nir_op_ball_iequal2:
1163    case nir_op_ball_iequal3:
1164    case nir_op_ball_iequal4:
1165       assert(nir_op_infos[alu->op].num_inputs == 2);
1166       assert(alu_instr_src_components(alu, 0) ==
1167              alu_instr_src_components(alu, 1));
1168       result = emit_binop(ctx, SpvOpIEqual,
1169                           get_bvec_type(ctx, alu_instr_src_components(alu, 0)),
1170                           src[0], src[1]);
1171       result = emit_unop(ctx, SpvOpAll, dest_type, result);
1172       break;
1173
1174    case nir_op_vec2:
1175    case nir_op_vec3:
1176    case nir_op_vec4: {
1177       int num_inputs = nir_op_infos[alu->op].num_inputs;
1178       assert(2 <= num_inputs && num_inputs <= 4);
1179       result = spirv_builder_emit_composite_construct(&ctx->builder, dest_type,
1180                                                       src, num_inputs);
1181    }
1182    break;
1183
1184    default:
1185       fprintf(stderr, "emit_alu: not implemented (%s)\n",
1186               nir_op_infos[alu->op].name);
1187
1188       unreachable("unsupported opcode");
1189       return;
1190    }
1191
1192    store_alu_result(ctx, alu, result);
1193 }
1194
1195 static void
1196 emit_load_const(struct ntv_context *ctx, nir_load_const_instr *load_const)
1197 {
1198    unsigned bit_size = load_const->def.bit_size;
1199    unsigned num_components = load_const->def.num_components;
1200
1201    SpvId constant;
1202    if (num_components > 1) {
1203       SpvId components[num_components];
1204       SpvId type;
1205       if (bit_size == 1) {
1206          for (int i = 0; i < num_components; i++)
1207             components[i] = spirv_builder_const_bool(&ctx->builder,
1208                                                      load_const->value[i].b);
1209
1210          type = get_bvec_type(ctx, num_components);
1211       } else {
1212          for (int i = 0; i < num_components; i++)
1213             components[i] = emit_uint_const(ctx, bit_size,
1214                                             load_const->value[i].u32);
1215
1216          type = get_uvec_type(ctx, bit_size, num_components);
1217       }
1218       constant = spirv_builder_const_composite(&ctx->builder, type,
1219                                                components, num_components);
1220    } else {
1221       assert(num_components == 1);
1222       if (bit_size == 1)
1223          constant = spirv_builder_const_bool(&ctx->builder,
1224                                              load_const->value[0].b);
1225       else
1226          constant = emit_uint_const(ctx, bit_size, load_const->value[0].u32);
1227    }
1228
1229    if (bit_size == 1)
1230       constant = bvec_to_uvec(ctx, constant, num_components);
1231
1232    store_ssa_def_uint(ctx, &load_const->def, constant);
1233 }
1234
1235 static void
1236 emit_load_ubo(struct ntv_context *ctx, nir_intrinsic_instr *intr)
1237 {
1238    nir_const_value *const_block_index = nir_src_as_const_value(intr->src[0]);
1239    assert(const_block_index); // no dynamic indexing for now
1240    assert(const_block_index->u32 == 0); // we only support the default UBO for now
1241
1242    nir_const_value *const_offset = nir_src_as_const_value(intr->src[1]);
1243    if (const_offset) {
1244       SpvId uvec4_type = get_uvec_type(ctx, 32, 4);
1245       SpvId pointer_type = spirv_builder_type_pointer(&ctx->builder,
1246                                                       SpvStorageClassUniform,
1247                                                       uvec4_type);
1248
1249       unsigned idx = const_offset->u32;
1250       SpvId member = emit_uint_const(ctx, 32, 0);
1251       SpvId offset = emit_uint_const(ctx, 32, idx);
1252       SpvId offsets[] = { member, offset };
1253       SpvId ptr = spirv_builder_emit_access_chain(&ctx->builder, pointer_type,
1254                                                   ctx->ubos[0], offsets,
1255                                                   ARRAY_SIZE(offsets));
1256       SpvId result = spirv_builder_emit_load(&ctx->builder, uvec4_type, ptr);
1257
1258       SpvId type = get_dest_uvec_type(ctx, &intr->dest);
1259       unsigned num_components = nir_dest_num_components(intr->dest);
1260       if (num_components == 1) {
1261          uint32_t components[] = { 0 };
1262          result = spirv_builder_emit_composite_extract(&ctx->builder,
1263                                                        type,
1264                                                        result, components,
1265                                                        1);
1266       } else if (num_components < 4) {
1267          SpvId constituents[num_components];
1268          SpvId uint_type = spirv_builder_type_uint(&ctx->builder, 32);
1269          for (uint32_t i = 0; i < num_components; ++i)
1270             constituents[i] = spirv_builder_emit_composite_extract(&ctx->builder,
1271                                                                    uint_type,
1272                                                                    result, &i,
1273                                                                    1);
1274
1275          result = spirv_builder_emit_composite_construct(&ctx->builder,
1276                                                          type,
1277                                                          constituents,
1278                                                          num_components);
1279       }
1280
1281       store_dest_uint(ctx, &intr->dest, result);
1282    } else
1283       unreachable("uniform-addressing not yet supported");
1284 }
1285
1286 static void
1287 emit_discard(struct ntv_context *ctx, nir_intrinsic_instr *intr)
1288 {
1289    assert(ctx->block_started);
1290    spirv_builder_emit_kill(&ctx->builder);
1291    /* discard is weird in NIR, so let's just create an unreachable block after
1292       it and hope that the vulkan driver will DCE any instructinos in it. */
1293    spirv_builder_label(&ctx->builder, spirv_builder_new_id(&ctx->builder));
1294 }
1295
1296 static void
1297 emit_load_deref(struct ntv_context *ctx, nir_intrinsic_instr *intr)
1298 {
1299    /* uint is a bit of a lie here; it's really just a pointer */
1300    SpvId ptr = get_src_uint(ctx, intr->src);
1301
1302    nir_variable *var = nir_intrinsic_get_var(intr, 0);
1303    SpvId result = spirv_builder_emit_load(&ctx->builder,
1304                                           get_glsl_type(ctx, var->type),
1305                                           ptr);
1306    unsigned num_components = nir_dest_num_components(intr->dest);
1307    unsigned bit_size = nir_dest_bit_size(intr->dest);
1308    result = bitcast_to_uvec(ctx, result, bit_size, num_components);
1309    store_dest_uint(ctx, &intr->dest, result);
1310 }
1311
1312 static void
1313 emit_store_deref(struct ntv_context *ctx, nir_intrinsic_instr *intr)
1314 {
1315    /* uint is a bit of a lie here; it's really just a pointer */
1316    SpvId ptr = get_src_uint(ctx, &intr->src[0]);
1317    SpvId src = get_src_uint(ctx, &intr->src[1]);
1318
1319    nir_variable *var = nir_intrinsic_get_var(intr, 0);
1320    SpvId type = get_glsl_type(ctx, glsl_without_array(var->type));
1321    SpvId result = emit_bitcast(ctx, type, src);
1322    spirv_builder_emit_store(&ctx->builder, ptr, result);
1323 }
1324
1325 static SpvId
1326 create_builtin_var(struct ntv_context *ctx, SpvId var_type,
1327                    SpvStorageClass storage_class,
1328                    const char *name, SpvBuiltIn builtin)
1329 {
1330    SpvId pointer_type = spirv_builder_type_pointer(&ctx->builder,
1331                                                    storage_class,
1332                                                    var_type);
1333    SpvId var = spirv_builder_emit_var(&ctx->builder, pointer_type,
1334                                       storage_class);
1335    spirv_builder_emit_name(&ctx->builder, var, name);
1336    spirv_builder_emit_builtin(&ctx->builder, var, builtin);
1337
1338    assert(ctx->num_entry_ifaces < ARRAY_SIZE(ctx->entry_ifaces));
1339    ctx->entry_ifaces[ctx->num_entry_ifaces++] = var;
1340    return var;
1341 }
1342
1343 static void
1344 emit_load_front_face(struct ntv_context *ctx, nir_intrinsic_instr *intr)
1345 {
1346    SpvId var_type = spirv_builder_type_bool(&ctx->builder);
1347    if (!ctx->front_face_var)
1348       ctx->front_face_var = create_builtin_var(ctx, var_type,
1349                                                SpvStorageClassInput,
1350                                                "gl_FrontFacing",
1351                                                SpvBuiltInFrontFacing);
1352
1353    SpvId result = spirv_builder_emit_load(&ctx->builder, var_type,
1354                                           ctx->front_face_var);
1355    assert(1 == nir_dest_num_components(intr->dest));
1356    store_dest(ctx, &intr->dest, result, nir_type_bool);
1357 }
1358
1359 static void
1360 emit_load_instance_id(struct ntv_context *ctx, nir_intrinsic_instr *intr)
1361 {
1362    SpvId var_type = spirv_builder_type_uint(&ctx->builder, 32);
1363    if (!ctx->instance_id_var)
1364       ctx->instance_id_var = create_builtin_var(ctx, var_type,
1365                                                SpvStorageClassInput,
1366                                                "gl_InstanceId",
1367                                                SpvBuiltInInstanceIndex);
1368
1369    SpvId result = spirv_builder_emit_load(&ctx->builder, var_type,
1370                                           ctx->instance_id_var);
1371    assert(1 == nir_dest_num_components(intr->dest));
1372    store_dest_uint(ctx, &intr->dest, result);
1373 }
1374
1375 static void
1376 emit_load_vertex_id(struct ntv_context *ctx, nir_intrinsic_instr *intr)
1377 {
1378    SpvId var_type = spirv_builder_type_uint(&ctx->builder, 32);
1379    if (!ctx->vertex_id_var)
1380       ctx->vertex_id_var = create_builtin_var(ctx, var_type,
1381                                                SpvStorageClassInput,
1382                                                "gl_VertexID",
1383                                                SpvBuiltInVertexIndex);
1384
1385    SpvId result = spirv_builder_emit_load(&ctx->builder, var_type,
1386                                           ctx->vertex_id_var);
1387    assert(1 == nir_dest_num_components(intr->dest));
1388    store_dest_uint(ctx, &intr->dest, result);
1389 }
1390
1391 static void
1392 emit_intrinsic(struct ntv_context *ctx, nir_intrinsic_instr *intr)
1393 {
1394    switch (intr->intrinsic) {
1395    case nir_intrinsic_load_ubo:
1396       emit_load_ubo(ctx, intr);
1397       break;
1398
1399    case nir_intrinsic_discard:
1400       emit_discard(ctx, intr);
1401       break;
1402
1403    case nir_intrinsic_load_deref:
1404       emit_load_deref(ctx, intr);
1405       break;
1406
1407    case nir_intrinsic_store_deref:
1408       emit_store_deref(ctx, intr);
1409       break;
1410
1411    case nir_intrinsic_load_front_face:
1412       emit_load_front_face(ctx, intr);
1413       break;
1414
1415    case nir_intrinsic_load_instance_id:
1416       emit_load_instance_id(ctx, intr);
1417       break;
1418
1419    case nir_intrinsic_load_vertex_id:
1420       emit_load_vertex_id(ctx, intr);
1421       break;
1422
1423    default:
1424       fprintf(stderr, "emit_intrinsic: not implemented (%s)\n",
1425               nir_intrinsic_infos[intr->intrinsic].name);
1426       unreachable("unsupported intrinsic");
1427    }
1428 }
1429
1430 static void
1431 emit_undef(struct ntv_context *ctx, nir_ssa_undef_instr *undef)
1432 {
1433    SpvId type = get_uvec_type(ctx, undef->def.bit_size,
1434                               undef->def.num_components);
1435
1436    store_ssa_def_uint(ctx, &undef->def,
1437                       spirv_builder_emit_undef(&ctx->builder, type));
1438 }
1439
1440 static SpvId
1441 get_src_float(struct ntv_context *ctx, nir_src *src)
1442 {
1443    SpvId def = get_src_uint(ctx, src);
1444    unsigned num_components = nir_src_num_components(*src);
1445    unsigned bit_size = nir_src_bit_size(*src);
1446    return bitcast_to_fvec(ctx, def, bit_size, num_components);
1447 }
1448
1449 static SpvId
1450 get_src_int(struct ntv_context *ctx, nir_src *src)
1451 {
1452    SpvId def = get_src_uint(ctx, src);
1453    unsigned num_components = nir_src_num_components(*src);
1454    unsigned bit_size = nir_src_bit_size(*src);
1455    return bitcast_to_ivec(ctx, def, bit_size, num_components);
1456 }
1457
1458 static void
1459 emit_tex(struct ntv_context *ctx, nir_tex_instr *tex)
1460 {
1461    assert(tex->op == nir_texop_tex ||
1462           tex->op == nir_texop_txb ||
1463           tex->op == nir_texop_txl ||
1464           tex->op == nir_texop_txd ||
1465           tex->op == nir_texop_txf ||
1466           tex->op == nir_texop_txs);
1467    assert(tex->texture_index == tex->sampler_index);
1468
1469    SpvId coord = 0, proj = 0, bias = 0, lod = 0, dref = 0, dx = 0, dy = 0,
1470          offset = 0;
1471    unsigned coord_components = 0;
1472    for (unsigned i = 0; i < tex->num_srcs; i++) {
1473       switch (tex->src[i].src_type) {
1474       case nir_tex_src_coord:
1475          if (tex->op == nir_texop_txf)
1476             coord = get_src_int(ctx, &tex->src[i].src);
1477          else
1478             coord = get_src_float(ctx, &tex->src[i].src);
1479          coord_components = nir_src_num_components(tex->src[i].src);
1480          break;
1481
1482       case nir_tex_src_projector:
1483          assert(nir_src_num_components(tex->src[i].src) == 1);
1484          proj = get_src_float(ctx, &tex->src[i].src);
1485          assert(proj != 0);
1486          break;
1487
1488       case nir_tex_src_offset:
1489          offset = get_src_int(ctx, &tex->src[i].src);
1490          break;
1491
1492       case nir_tex_src_bias:
1493          assert(tex->op == nir_texop_txb);
1494          bias = get_src_float(ctx, &tex->src[i].src);
1495          assert(bias != 0);
1496          break;
1497
1498       case nir_tex_src_lod:
1499          assert(nir_src_num_components(tex->src[i].src) == 1);
1500          if (tex->op == nir_texop_txf ||
1501              tex->op == nir_texop_txs)
1502             lod = get_src_int(ctx, &tex->src[i].src);
1503          else
1504             lod = get_src_float(ctx, &tex->src[i].src);
1505          assert(lod != 0);
1506          break;
1507
1508       case nir_tex_src_comparator:
1509          assert(nir_src_num_components(tex->src[i].src) == 1);
1510          dref = get_src_float(ctx, &tex->src[i].src);
1511          assert(dref != 0);
1512          break;
1513
1514       case nir_tex_src_ddx:
1515          dx = get_src_float(ctx, &tex->src[i].src);
1516          assert(dx != 0);
1517          break;
1518
1519       case nir_tex_src_ddy:
1520          dy = get_src_float(ctx, &tex->src[i].src);
1521          assert(dy != 0);
1522          break;
1523
1524       default:
1525          fprintf(stderr, "texture source: %d\n", tex->src[i].src_type);
1526          unreachable("unknown texture source");
1527       }
1528    }
1529
1530    if (lod == 0 && ctx->stage != MESA_SHADER_FRAGMENT) {
1531       lod = emit_float_const(ctx, 32, 0.0f);
1532       assert(lod != 0);
1533    }
1534
1535    SpvId image_type = ctx->image_types[tex->texture_index];
1536    SpvId sampled_type = spirv_builder_type_sampled_image(&ctx->builder,
1537                                                          image_type);
1538
1539    assert(ctx->samplers_used & (1u << tex->texture_index));
1540    SpvId load = spirv_builder_emit_load(&ctx->builder, sampled_type,
1541                                         ctx->samplers[tex->texture_index]);
1542
1543    SpvId dest_type = get_dest_type(ctx, &tex->dest, tex->dest_type);
1544
1545    if (tex->op == nir_texop_txs) {
1546       SpvId image = spirv_builder_emit_image(&ctx->builder, image_type, load);
1547       SpvId result = spirv_builder_emit_image_query_size(&ctx->builder,
1548                                                          dest_type, image,
1549                                                          lod);
1550       store_dest(ctx, &tex->dest, result, tex->dest_type);
1551       return;
1552    }
1553
1554    if (proj && coord_components > 0) {
1555       SpvId constituents[coord_components + 1];
1556       if (coord_components == 1)
1557          constituents[0] = coord;
1558       else {
1559          assert(coord_components > 1);
1560          SpvId float_type = spirv_builder_type_float(&ctx->builder, 32);
1561          for (uint32_t i = 0; i < coord_components; ++i)
1562             constituents[i] = spirv_builder_emit_composite_extract(&ctx->builder,
1563                                                  float_type,
1564                                                  coord,
1565                                                  &i, 1);
1566       }
1567
1568       constituents[coord_components++] = proj;
1569
1570       SpvId vec_type = get_fvec_type(ctx, 32, coord_components);
1571       coord = spirv_builder_emit_composite_construct(&ctx->builder,
1572                                                             vec_type,
1573                                                             constituents,
1574                                                             coord_components);
1575    }
1576
1577    SpvId actual_dest_type = dest_type;
1578    if (dref)
1579       actual_dest_type = spirv_builder_type_float(&ctx->builder, 32);
1580
1581    SpvId result;
1582    if (tex->op == nir_texop_txf) {
1583       SpvId image = spirv_builder_emit_image(&ctx->builder, image_type, load);
1584       result = spirv_builder_emit_image_fetch(&ctx->builder, dest_type,
1585                                               image, coord, lod);
1586    } else {
1587       result = spirv_builder_emit_image_sample(&ctx->builder,
1588                                                actual_dest_type, load,
1589                                                coord,
1590                                                proj != 0,
1591                                                lod, bias, dref, dx, dy,
1592                                                offset);
1593    }
1594
1595    spirv_builder_emit_decoration(&ctx->builder, result,
1596                                  SpvDecorationRelaxedPrecision);
1597
1598    if (dref && nir_dest_num_components(tex->dest) > 1) {
1599       SpvId components[4] = { result, result, result, result };
1600       result = spirv_builder_emit_composite_construct(&ctx->builder,
1601                                                       dest_type,
1602                                                       components,
1603                                                       4);
1604    }
1605
1606    store_dest(ctx, &tex->dest, result, tex->dest_type);
1607 }
1608
1609 static void
1610 start_block(struct ntv_context *ctx, SpvId label)
1611 {
1612    /* terminate previous block if needed */
1613    if (ctx->block_started)
1614       spirv_builder_emit_branch(&ctx->builder, label);
1615
1616    /* start new block */
1617    spirv_builder_label(&ctx->builder, label);
1618    ctx->block_started = true;
1619 }
1620
1621 static void
1622 branch(struct ntv_context *ctx, SpvId label)
1623 {
1624    assert(ctx->block_started);
1625    spirv_builder_emit_branch(&ctx->builder, label);
1626    ctx->block_started = false;
1627 }
1628
1629 static void
1630 branch_conditional(struct ntv_context *ctx, SpvId condition, SpvId then_id,
1631                    SpvId else_id)
1632 {
1633    assert(ctx->block_started);
1634    spirv_builder_emit_branch_conditional(&ctx->builder, condition,
1635                                          then_id, else_id);
1636    ctx->block_started = false;
1637 }
1638
1639 static void
1640 emit_jump(struct ntv_context *ctx, nir_jump_instr *jump)
1641 {
1642    switch (jump->type) {
1643    case nir_jump_break:
1644       assert(ctx->loop_break);
1645       branch(ctx, ctx->loop_break);
1646       break;
1647
1648    case nir_jump_continue:
1649       assert(ctx->loop_cont);
1650       branch(ctx, ctx->loop_cont);
1651       break;
1652
1653    default:
1654       unreachable("Unsupported jump type\n");
1655    }
1656 }
1657
1658 static void
1659 emit_deref_var(struct ntv_context *ctx, nir_deref_instr *deref)
1660 {
1661    assert(deref->deref_type == nir_deref_type_var);
1662
1663    struct hash_entry *he = _mesa_hash_table_search(ctx->vars, deref->var);
1664    assert(he);
1665    SpvId result = (SpvId)(intptr_t)he->data;
1666    /* uint is a bit of a lie here, it's really just an opaque type */
1667    store_dest_uint(ctx, &deref->dest, result);
1668 }
1669
1670 static void
1671 emit_deref_array(struct ntv_context *ctx, nir_deref_instr *deref)
1672 {
1673    assert(deref->deref_type == nir_deref_type_array);
1674    nir_variable *var = nir_deref_instr_get_variable(deref);
1675
1676    SpvStorageClass storage_class;
1677    switch (var->data.mode) {
1678    case nir_var_shader_in:
1679       storage_class = SpvStorageClassInput;
1680       break;
1681
1682    case nir_var_shader_out:
1683       storage_class = SpvStorageClassOutput;
1684       break;
1685
1686    default:
1687       unreachable("Unsupported nir_variable_mode\n");
1688    }
1689
1690    SpvId index = get_src_uint(ctx, &deref->arr.index);
1691
1692    SpvId ptr_type = spirv_builder_type_pointer(&ctx->builder,
1693                                                storage_class,
1694                                                get_glsl_type(ctx, deref->type));
1695
1696    SpvId result = spirv_builder_emit_access_chain(&ctx->builder,
1697                                                   ptr_type,
1698                                                   get_src_uint(ctx, &deref->parent),
1699                                                   &index, 1);
1700    /* uint is a bit of a lie here, it's really just an opaque type */
1701    store_dest_uint(ctx, &deref->dest, result);
1702 }
1703
1704 static void
1705 emit_deref(struct ntv_context *ctx, nir_deref_instr *deref)
1706 {
1707    switch (deref->deref_type) {
1708    case nir_deref_type_var:
1709       emit_deref_var(ctx, deref);
1710       break;
1711
1712    case nir_deref_type_array:
1713       emit_deref_array(ctx, deref);
1714       break;
1715
1716    default:
1717       unreachable("unexpected deref_type");
1718    }
1719 }
1720
1721 static void
1722 emit_block(struct ntv_context *ctx, struct nir_block *block)
1723 {
1724    start_block(ctx, block_label(ctx, block));
1725    nir_foreach_instr(instr, block) {
1726       switch (instr->type) {
1727       case nir_instr_type_alu:
1728          emit_alu(ctx, nir_instr_as_alu(instr));
1729          break;
1730       case nir_instr_type_intrinsic:
1731          emit_intrinsic(ctx, nir_instr_as_intrinsic(instr));
1732          break;
1733       case nir_instr_type_load_const:
1734          emit_load_const(ctx, nir_instr_as_load_const(instr));
1735          break;
1736       case nir_instr_type_ssa_undef:
1737          emit_undef(ctx, nir_instr_as_ssa_undef(instr));
1738          break;
1739       case nir_instr_type_tex:
1740          emit_tex(ctx, nir_instr_as_tex(instr));
1741          break;
1742       case nir_instr_type_phi:
1743          unreachable("nir_instr_type_phi not supported");
1744          break;
1745       case nir_instr_type_jump:
1746          emit_jump(ctx, nir_instr_as_jump(instr));
1747          break;
1748       case nir_instr_type_call:
1749          unreachable("nir_instr_type_call not supported");
1750          break;
1751       case nir_instr_type_parallel_copy:
1752          unreachable("nir_instr_type_parallel_copy not supported");
1753          break;
1754       case nir_instr_type_deref:
1755          emit_deref(ctx, nir_instr_as_deref(instr));
1756          break;
1757       }
1758    }
1759 }
1760
1761 static void
1762 emit_cf_list(struct ntv_context *ctx, struct exec_list *list);
1763
1764 static SpvId
1765 get_src_bool(struct ntv_context *ctx, nir_src *src)
1766 {
1767    SpvId def = get_src_uint(ctx, src);
1768    assert(nir_src_bit_size(*src) == 1);
1769    unsigned num_components = nir_src_num_components(*src);
1770    return uvec_to_bvec(ctx, def, num_components);
1771 }
1772
1773 static void
1774 emit_if(struct ntv_context *ctx, nir_if *if_stmt)
1775 {
1776    SpvId condition = get_src_bool(ctx, &if_stmt->condition);
1777
1778    SpvId header_id = spirv_builder_new_id(&ctx->builder);
1779    SpvId then_id = block_label(ctx, nir_if_first_then_block(if_stmt));
1780    SpvId endif_id = spirv_builder_new_id(&ctx->builder);
1781    SpvId else_id = endif_id;
1782
1783    bool has_else = !exec_list_is_empty(&if_stmt->else_list);
1784    if (has_else) {
1785       assert(nir_if_first_else_block(if_stmt)->index < ctx->num_blocks);
1786       else_id = block_label(ctx, nir_if_first_else_block(if_stmt));
1787    }
1788
1789    /* create a header-block */
1790    start_block(ctx, header_id);
1791    spirv_builder_emit_selection_merge(&ctx->builder, endif_id,
1792                                       SpvSelectionControlMaskNone);
1793    branch_conditional(ctx, condition, then_id, else_id);
1794
1795    emit_cf_list(ctx, &if_stmt->then_list);
1796
1797    if (has_else) {
1798       if (ctx->block_started)
1799          branch(ctx, endif_id);
1800
1801       emit_cf_list(ctx, &if_stmt->else_list);
1802    }
1803
1804    start_block(ctx, endif_id);
1805 }
1806
1807 static void
1808 emit_loop(struct ntv_context *ctx, nir_loop *loop)
1809 {
1810    SpvId header_id = spirv_builder_new_id(&ctx->builder);
1811    SpvId begin_id = block_label(ctx, nir_loop_first_block(loop));
1812    SpvId break_id = spirv_builder_new_id(&ctx->builder);
1813    SpvId cont_id = spirv_builder_new_id(&ctx->builder);
1814
1815    /* create a header-block */
1816    start_block(ctx, header_id);
1817    spirv_builder_loop_merge(&ctx->builder, break_id, cont_id, SpvLoopControlMaskNone);
1818    branch(ctx, begin_id);
1819
1820    SpvId save_break = ctx->loop_break;
1821    SpvId save_cont = ctx->loop_cont;
1822    ctx->loop_break = break_id;
1823    ctx->loop_cont = cont_id;
1824
1825    emit_cf_list(ctx, &loop->body);
1826
1827    ctx->loop_break = save_break;
1828    ctx->loop_cont = save_cont;
1829
1830    branch(ctx, cont_id);
1831    start_block(ctx, cont_id);
1832    branch(ctx, header_id);
1833
1834    start_block(ctx, break_id);
1835 }
1836
1837 static void
1838 emit_cf_list(struct ntv_context *ctx, struct exec_list *list)
1839 {
1840    foreach_list_typed(nir_cf_node, node, node, list) {
1841       switch (node->type) {
1842       case nir_cf_node_block:
1843          emit_block(ctx, nir_cf_node_as_block(node));
1844          break;
1845
1846       case nir_cf_node_if:
1847          emit_if(ctx, nir_cf_node_as_if(node));
1848          break;
1849
1850       case nir_cf_node_loop:
1851          emit_loop(ctx, nir_cf_node_as_loop(node));
1852          break;
1853
1854       case nir_cf_node_function:
1855          unreachable("nir_cf_node_function not supported");
1856          break;
1857       }
1858    }
1859 }
1860
1861 struct spirv_shader *
1862 nir_to_spirv(struct nir_shader *s)
1863 {
1864    struct spirv_shader *ret = NULL;
1865
1866    struct ntv_context ctx = {};
1867
1868    switch (s->info.stage) {
1869    case MESA_SHADER_VERTEX:
1870    case MESA_SHADER_FRAGMENT:
1871    case MESA_SHADER_COMPUTE:
1872       spirv_builder_emit_cap(&ctx.builder, SpvCapabilityShader);
1873       break;
1874
1875    case MESA_SHADER_TESS_CTRL:
1876    case MESA_SHADER_TESS_EVAL:
1877       spirv_builder_emit_cap(&ctx.builder, SpvCapabilityTessellation);
1878       break;
1879
1880    case MESA_SHADER_GEOMETRY:
1881       spirv_builder_emit_cap(&ctx.builder, SpvCapabilityGeometry);
1882       break;
1883
1884    default:
1885       unreachable("invalid stage");
1886    }
1887
1888    // TODO: only enable when needed
1889    if (s->info.stage == MESA_SHADER_FRAGMENT) {
1890       spirv_builder_emit_cap(&ctx.builder, SpvCapabilitySampled1D);
1891       spirv_builder_emit_cap(&ctx.builder, SpvCapabilityImageQuery);
1892       spirv_builder_emit_cap(&ctx.builder, SpvCapabilityDerivativeControl);
1893    }
1894
1895    ctx.stage = s->info.stage;
1896    ctx.GLSL_std_450 = spirv_builder_import(&ctx.builder, "GLSL.std.450");
1897    spirv_builder_emit_source(&ctx.builder, SpvSourceLanguageGLSL, 450);
1898
1899    spirv_builder_emit_mem_model(&ctx.builder, SpvAddressingModelLogical,
1900                                 SpvMemoryModelGLSL450);
1901
1902    SpvExecutionModel exec_model;
1903    switch (s->info.stage) {
1904    case MESA_SHADER_VERTEX:
1905       exec_model = SpvExecutionModelVertex;
1906       break;
1907    case MESA_SHADER_TESS_CTRL:
1908       exec_model = SpvExecutionModelTessellationControl;
1909       break;
1910    case MESA_SHADER_TESS_EVAL:
1911       exec_model = SpvExecutionModelTessellationEvaluation;
1912       break;
1913    case MESA_SHADER_GEOMETRY:
1914       exec_model = SpvExecutionModelGeometry;
1915       break;
1916    case MESA_SHADER_FRAGMENT:
1917       exec_model = SpvExecutionModelFragment;
1918       break;
1919    case MESA_SHADER_COMPUTE:
1920       exec_model = SpvExecutionModelGLCompute;
1921       break;
1922    default:
1923       unreachable("invalid stage");
1924    }
1925
1926    SpvId type_void = spirv_builder_type_void(&ctx.builder);
1927    SpvId type_main = spirv_builder_type_function(&ctx.builder, type_void,
1928                                                  NULL, 0);
1929    SpvId entry_point = spirv_builder_new_id(&ctx.builder);
1930    spirv_builder_emit_name(&ctx.builder, entry_point, "main");
1931
1932    ctx.vars = _mesa_hash_table_create(NULL, _mesa_hash_pointer,
1933                                       _mesa_key_pointer_equal);
1934
1935    nir_foreach_variable(var, &s->inputs)
1936       emit_input(&ctx, var);
1937
1938    nir_foreach_variable(var, &s->outputs)
1939       emit_output(&ctx, var);
1940
1941    nir_foreach_variable(var, &s->uniforms)
1942       emit_uniform(&ctx, var);
1943
1944    if (s->info.stage == MESA_SHADER_FRAGMENT) {
1945       spirv_builder_emit_exec_mode(&ctx.builder, entry_point,
1946                                    SpvExecutionModeOriginUpperLeft);
1947       if (s->info.outputs_written & BITFIELD64_BIT(FRAG_RESULT_DEPTH))
1948          spirv_builder_emit_exec_mode(&ctx.builder, entry_point,
1949                                       SpvExecutionModeDepthReplacing);
1950    }
1951
1952
1953    spirv_builder_function(&ctx.builder, entry_point, type_void,
1954                                             SpvFunctionControlMaskNone,
1955                                             type_main);
1956
1957    nir_function_impl *entry = nir_shader_get_entrypoint(s);
1958    nir_metadata_require(entry, nir_metadata_block_index);
1959
1960    ctx.defs = (SpvId *)malloc(sizeof(SpvId) * entry->ssa_alloc);
1961    if (!ctx.defs)
1962       goto fail;
1963    ctx.num_defs = entry->ssa_alloc;
1964
1965    nir_index_local_regs(entry);
1966    ctx.regs = malloc(sizeof(SpvId) * entry->reg_alloc);
1967    if (!ctx.regs)
1968       goto fail;
1969    ctx.num_regs = entry->reg_alloc;
1970
1971    SpvId *block_ids = (SpvId *)malloc(sizeof(SpvId) * entry->num_blocks);
1972    if (!block_ids)
1973       goto fail;
1974
1975    for (int i = 0; i < entry->num_blocks; ++i)
1976       block_ids[i] = spirv_builder_new_id(&ctx.builder);
1977
1978    ctx.block_ids = block_ids;
1979    ctx.num_blocks = entry->num_blocks;
1980
1981    /* emit a block only for the variable declarations */
1982    start_block(&ctx, spirv_builder_new_id(&ctx.builder));
1983    foreach_list_typed(nir_register, reg, node, &entry->registers) {
1984       SpvId type = get_uvec_type(&ctx, reg->bit_size, reg->num_components);
1985       SpvId pointer_type = spirv_builder_type_pointer(&ctx.builder,
1986                                                       SpvStorageClassFunction,
1987                                                       type);
1988       SpvId var = spirv_builder_emit_var(&ctx.builder, pointer_type,
1989                                          SpvStorageClassFunction);
1990
1991       ctx.regs[reg->index] = var;
1992    }
1993
1994    emit_cf_list(&ctx, &entry->body);
1995
1996    free(ctx.defs);
1997
1998    spirv_builder_return(&ctx.builder); // doesn't belong here, but whatevz
1999    spirv_builder_function_end(&ctx.builder);
2000
2001    spirv_builder_emit_entry_point(&ctx.builder, exec_model, entry_point,
2002                                   "main", ctx.entry_ifaces,
2003                                   ctx.num_entry_ifaces);
2004
2005    size_t num_words = spirv_builder_get_num_words(&ctx.builder);
2006
2007    ret = CALLOC_STRUCT(spirv_shader);
2008    if (!ret)
2009       goto fail;
2010
2011    ret->words = MALLOC(sizeof(uint32_t) * num_words);
2012    if (!ret->words)
2013       goto fail;
2014
2015    ret->num_words = spirv_builder_get_words(&ctx.builder, ret->words, num_words);
2016    assert(ret->num_words == num_words);
2017
2018    return ret;
2019
2020 fail:
2021
2022    if (ret)
2023       spirv_shader_delete(ret);
2024
2025    if (ctx.vars)
2026       _mesa_hash_table_destroy(ctx.vars, NULL);
2027
2028    return NULL;
2029 }
2030
2031 void
2032 spirv_shader_delete(struct spirv_shader *s)
2033 {
2034    FREE(s->words);
2035    FREE(s);
2036 }