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_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_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(struct ntv_context *ctx, nir_src *src)
 566 {
 567    if (src->is_ssa)
 568       return get_src_ssa(ctx, src->ssa);
 569    else
 570       return get_src_reg(ctx, &src->reg);
 571 }
 572
 573 static SpvId
 574 get_alu_src_raw(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(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(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_raw(struct ntv_context *ctx, nir_dest *dest, SpvId result)
 711 {
 712    if (dest->is_ssa)
 713       store_ssa_def(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_raw(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_raw(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,
 897                      nir_op_infos[alu->op].output_type);
 898 }
 899
 900 static SpvId
 901 get_dest_type(struct ntv_context *ctx, nir_dest *dest, nir_alu_type type)
 902 {
 903    unsigned num_components = nir_dest_num_components(*dest);
 904    unsigned bit_size = nir_dest_bit_size(*dest);
 905
 906    switch (nir_alu_type_get_base_type(type)) {
 907    case nir_type_bool:
 908       return get_bvec_type(ctx, num_components);
 909
 910    case nir_type_int:
 911       return get_ivec_type(ctx, bit_size, num_components);
 912
 913    case nir_type_uint:
 914       return get_uvec_type(ctx, bit_size, num_components);
 915
 916    case nir_type_float:
 917       return get_fvec_type(ctx, bit_size, num_components);
 918
 919    default:
 920       unreachable("unsupported nir_alu_type");
 921    }
 922 }
 923
 924 static void
 925 emit_alu(struct ntv_context *ctx, nir_alu_instr *alu)
 926 {
 927    SpvId src[nir_op_infos[alu->op].num_inputs];
 928    for (unsigned i = 0; i < nir_op_infos[alu->op].num_inputs; i++)
 929       src[i] = get_alu_src(ctx, alu, i);
 930
 931    SpvId dest_type = get_dest_type(ctx, &alu->dest.dest,
 932                                    nir_op_infos[alu->op].output_type);
 933    unsigned bit_size = nir_dest_bit_size(alu->dest.dest);
 934    unsigned num_components = nir_dest_num_components(alu->dest.dest);
 935
 936    SpvId result = 0;
 937    switch (alu->op) {
 938    case nir_op_mov:
 939       assert(nir_op_infos[alu->op].num_inputs == 1);
 940       result = src[0];
 941       break;
 942
 943 #define UNOP(nir_op, spirv_op) \
 944    case nir_op: \
 945       assert(nir_op_infos[alu->op].num_inputs == 1); \
 946       result = emit_unop(ctx, spirv_op, dest_type, src[0]); \
 947       break;
 948
 949    UNOP(nir_op_ineg, SpvOpSNegate)
 950    UNOP(nir_op_fneg, SpvOpFNegate)
 951    UNOP(nir_op_fddx, SpvOpDPdx)
 952    UNOP(nir_op_fddx_coarse, SpvOpDPdxCoarse)
 953    UNOP(nir_op_fddx_fine, SpvOpDPdxFine)
 954    UNOP(nir_op_fddy, SpvOpDPdy)
 955    UNOP(nir_op_fddy_coarse, SpvOpDPdyCoarse)
 956    UNOP(nir_op_fddy_fine, SpvOpDPdyFine)
 957    UNOP(nir_op_f2i32, SpvOpConvertFToS)
 958    UNOP(nir_op_f2u32, SpvOpConvertFToU)
 959    UNOP(nir_op_i2f32, SpvOpConvertSToF)
 960    UNOP(nir_op_u2f32, SpvOpConvertUToF)
 961    UNOP(nir_op_inot, SpvOpNot)
 962 #undef UNOP
 963
 964    case nir_op_b2i32:
 965       assert(nir_op_infos[alu->op].num_inputs == 1);
 966       result = emit_select(ctx, dest_type, src[0],
 967                            get_ivec_constant(ctx, 32, num_components, 1),
 968                            get_ivec_constant(ctx, 32, num_components, 0));
 969       break;
 970
 971    case nir_op_b2f32:
 972       assert(nir_op_infos[alu->op].num_inputs == 1);
 973       result = emit_select(ctx, dest_type, src[0],
 974                            get_fvec_constant(ctx, 32, num_components, 1),
 975                            get_fvec_constant(ctx, 32, num_components, 0));
 976       break;
 977
 978 #define BUILTIN_UNOP(nir_op, spirv_op) \
 979    case nir_op: \
 980       assert(nir_op_infos[alu->op].num_inputs == 1); \
 981       result = emit_builtin_unop(ctx, spirv_op, dest_type, src[0]); \
 982       break;
 983
 984    BUILTIN_UNOP(nir_op_iabs, GLSLstd450SAbs)
 985    BUILTIN_UNOP(nir_op_fabs, GLSLstd450FAbs)
 986    BUILTIN_UNOP(nir_op_fsqrt, GLSLstd450Sqrt)
 987    BUILTIN_UNOP(nir_op_frsq, GLSLstd450InverseSqrt)
 988    BUILTIN_UNOP(nir_op_flog2, GLSLstd450Log2)
 989    BUILTIN_UNOP(nir_op_fexp2, GLSLstd450Exp2)
 990    BUILTIN_UNOP(nir_op_ffract, GLSLstd450Fract)
 991    BUILTIN_UNOP(nir_op_ffloor, GLSLstd450Floor)
 992    BUILTIN_UNOP(nir_op_fceil, GLSLstd450Ceil)
 993    BUILTIN_UNOP(nir_op_ftrunc, GLSLstd450Trunc)
 994    BUILTIN_UNOP(nir_op_fround_even, GLSLstd450RoundEven)
 995    BUILTIN_UNOP(nir_op_fsign, GLSLstd450FSign)
 996    BUILTIN_UNOP(nir_op_fsin, GLSLstd450Sin)
 997    BUILTIN_UNOP(nir_op_fcos, GLSLstd450Cos)
 998 #undef BUILTIN_UNOP
 999
1000    case nir_op_frcp:
1001       assert(nir_op_infos[alu->op].num_inputs == 1);
1002       result = emit_binop(ctx, SpvOpFDiv, dest_type,
1003                           get_fvec_constant(ctx, bit_size, num_components, 1),
1004                           src[0]);
1005       break;
1006
1007    case nir_op_f2b1:
1008       assert(nir_op_infos[alu->op].num_inputs == 1);
1009       result = emit_binop(ctx, SpvOpFOrdNotEqual, dest_type, src[0],
1010                           get_fvec_constant(ctx,
1011                                             nir_src_bit_size(alu->src[0].src),
1012                                             num_components, 0));
1013       break;
1014
1015
1016 #define BINOP(nir_op, spirv_op) \
1017    case nir_op: \
1018       assert(nir_op_infos[alu->op].num_inputs == 2); \
1019       result = emit_binop(ctx, spirv_op, dest_type, src[0], src[1]); \
1020       break;
1021
1022    BINOP(nir_op_iadd, SpvOpIAdd)
1023    BINOP(nir_op_isub, SpvOpISub)
1024    BINOP(nir_op_imul, SpvOpIMul)
1025    BINOP(nir_op_idiv, SpvOpSDiv)
1026    BINOP(nir_op_udiv, SpvOpUDiv)
1027    BINOP(nir_op_umod, SpvOpUMod)
1028    BINOP(nir_op_fadd, SpvOpFAdd)
1029    BINOP(nir_op_fsub, SpvOpFSub)
1030    BINOP(nir_op_fmul, SpvOpFMul)
1031    BINOP(nir_op_fdiv, SpvOpFDiv)
1032    BINOP(nir_op_fmod, SpvOpFMod)
1033    BINOP(nir_op_ilt, SpvOpSLessThan)
1034    BINOP(nir_op_ige, SpvOpSGreaterThanEqual)
1035    BINOP(nir_op_ieq, SpvOpIEqual)
1036    BINOP(nir_op_ine, SpvOpINotEqual)
1037    BINOP(nir_op_uge, SpvOpUGreaterThanEqual)
1038    BINOP(nir_op_flt, SpvOpFOrdLessThan)
1039    BINOP(nir_op_fge, SpvOpFOrdGreaterThanEqual)
1040    BINOP(nir_op_feq, SpvOpFOrdEqual)
1041    BINOP(nir_op_fne, SpvOpFOrdNotEqual)
1042    BINOP(nir_op_ishl, SpvOpShiftLeftLogical)
1043    BINOP(nir_op_ishr, SpvOpShiftRightArithmetic)
1044    BINOP(nir_op_ushr, SpvOpShiftRightLogical)
1045    BINOP(nir_op_iand, SpvOpBitwiseAnd)
1046    BINOP(nir_op_ior, SpvOpBitwiseOr)
1047 #undef BINOP
1048
1049 #define BUILTIN_BINOP(nir_op, spirv_op) \
1050    case nir_op: \
1051       assert(nir_op_infos[alu->op].num_inputs == 2); \
1052       result = emit_builtin_binop(ctx, spirv_op, dest_type, src[0], src[1]); \
1053       break;
1054
1055    BUILTIN_BINOP(nir_op_fmin, GLSLstd450FMin)
1056    BUILTIN_BINOP(nir_op_fmax, GLSLstd450FMax)
1057 #undef BUILTIN_BINOP
1058
1059    case nir_op_fdot2:
1060    case nir_op_fdot3:
1061    case nir_op_fdot4:
1062       assert(nir_op_infos[alu->op].num_inputs == 2);
1063       result = emit_binop(ctx, SpvOpDot, dest_type, src[0], src[1]);
1064       break;
1065
1066    case nir_op_fdph:
1067       unreachable("should already be lowered away");
1068
1069    case nir_op_seq:
1070    case nir_op_sne:
1071    case nir_op_slt:
1072    case nir_op_sge: {
1073       assert(nir_op_infos[alu->op].num_inputs == 2);
1074       int num_components = nir_dest_num_components(alu->dest.dest);
1075       SpvId bool_type = get_bvec_type(ctx, num_components);
1076
1077       SpvId zero = emit_float_const(ctx, bit_size, 0.0f);
1078       SpvId one = emit_float_const(ctx, bit_size, 1.0f);
1079       if (num_components > 1) {
1080          SpvId zero_comps[num_components], one_comps[num_components];
1081          for (int i = 0; i < num_components; i++) {
1082             zero_comps[i] = zero;
1083             one_comps[i] = one;
1084          }
1085
1086          zero = spirv_builder_const_composite(&ctx->builder, dest_type,
1087                                               zero_comps, num_components);
1088          one = spirv_builder_const_composite(&ctx->builder, dest_type,
1089                                              one_comps, num_components);
1090       }
1091
1092       SpvOp op;
1093       switch (alu->op) {
1094       case nir_op_seq: op = SpvOpFOrdEqual; break;
1095       case nir_op_sne: op = SpvOpFOrdNotEqual; break;
1096       case nir_op_slt: op = SpvOpFOrdLessThan; break;
1097       case nir_op_sge: op = SpvOpFOrdGreaterThanEqual; break;
1098       default: unreachable("unexpected op");
1099       }
1100
1101       result = emit_binop(ctx, op, bool_type, src[0], src[1]);
1102       result = emit_select(ctx, dest_type, result, one, zero);
1103       }
1104       break;
1105
1106    case nir_op_flrp:
1107       assert(nir_op_infos[alu->op].num_inputs == 3);
1108       result = emit_builtin_triop(ctx, GLSLstd450FMix, dest_type,
1109                                   src[0], src[1], src[2]);
1110       break;
1111
1112    case nir_op_fcsel:
1113       result = emit_binop(ctx, SpvOpFOrdGreaterThan,
1114                           get_bvec_type(ctx, num_components),
1115                           src[0],
1116                           get_fvec_constant(ctx,
1117                                             nir_src_bit_size(alu->src[0].src),
1118                                             num_components, 0));
1119       result = emit_select(ctx, dest_type, result, src[1], src[2]);
1120       break;
1121
1122    case nir_op_bcsel:
1123       assert(nir_op_infos[alu->op].num_inputs == 3);
1124       result = emit_select(ctx, dest_type, src[0], src[1], src[2]);
1125       break;
1126
1127    case nir_op_bany_fnequal2:
1128    case nir_op_bany_fnequal3:
1129    case nir_op_bany_fnequal4:
1130       assert(nir_op_infos[alu->op].num_inputs == 2);
1131       assert(alu_instr_src_components(alu, 0) ==
1132              alu_instr_src_components(alu, 1));
1133       result = emit_binop(ctx, SpvOpFOrdNotEqual,
1134                           get_bvec_type(ctx, alu_instr_src_components(alu, 0)),
1135                           src[0], src[1]);
1136       result = emit_unop(ctx, SpvOpAny, dest_type, result);
1137       break;
1138
1139    case nir_op_ball_fequal2:
1140    case nir_op_ball_fequal3:
1141    case nir_op_ball_fequal4:
1142       assert(nir_op_infos[alu->op].num_inputs == 2);
1143       assert(alu_instr_src_components(alu, 0) ==
1144              alu_instr_src_components(alu, 1));
1145       result = emit_binop(ctx, SpvOpFOrdEqual,
1146                           get_bvec_type(ctx, alu_instr_src_components(alu, 0)),
1147                           src[0], src[1]);
1148       result = emit_unop(ctx, SpvOpAll, dest_type, result);
1149       break;
1150
1151    case nir_op_bany_inequal2:
1152    case nir_op_bany_inequal3:
1153    case nir_op_bany_inequal4:
1154       assert(nir_op_infos[alu->op].num_inputs == 2);
1155       assert(alu_instr_src_components(alu, 0) ==
1156              alu_instr_src_components(alu, 1));
1157       result = emit_binop(ctx, SpvOpINotEqual,
1158                           get_bvec_type(ctx, alu_instr_src_components(alu, 0)),
1159                           src[0], src[1]);
1160       result = emit_unop(ctx, SpvOpAny, dest_type, result);
1161       break;
1162
1163    case nir_op_ball_iequal2:
1164    case nir_op_ball_iequal3:
1165    case nir_op_ball_iequal4:
1166       assert(nir_op_infos[alu->op].num_inputs == 2);
1167       assert(alu_instr_src_components(alu, 0) ==
1168              alu_instr_src_components(alu, 1));
1169       result = emit_binop(ctx, SpvOpIEqual,
1170                           get_bvec_type(ctx, alu_instr_src_components(alu, 0)),
1171                           src[0], src[1]);
1172       result = emit_unop(ctx, SpvOpAll, dest_type, result);
1173       break;
1174
1175    case nir_op_vec2:
1176    case nir_op_vec3:
1177    case nir_op_vec4: {
1178       int num_inputs = nir_op_infos[alu->op].num_inputs;
1179       assert(2 <= num_inputs && num_inputs <= 4);
1180       result = spirv_builder_emit_composite_construct(&ctx->builder, dest_type,
1181                                                       src, num_inputs);
1182    }
1183    break;
1184
1185    default:
1186       fprintf(stderr, "emit_alu: not implemented (%s)\n",
1187               nir_op_infos[alu->op].name);
1188
1189       unreachable("unsupported opcode");
1190       return;
1191    }
1192
1193    store_alu_result(ctx, alu, result);
1194 }
1195
1196 static void
1197 emit_load_const(struct ntv_context *ctx, nir_load_const_instr *load_const)
1198 {
1199    unsigned bit_size = load_const->def.bit_size;
1200    unsigned num_components = load_const->def.num_components;
1201
1202    SpvId constant;
1203    if (num_components > 1) {
1204       SpvId components[num_components];
1205       SpvId type;
1206       if (bit_size == 1) {
1207          for (int i = 0; i < num_components; i++)
1208             components[i] = spirv_builder_const_bool(&ctx->builder,
1209                                                      load_const->value[i].b);
1210
1211          type = get_bvec_type(ctx, num_components);
1212       } else {
1213          for (int i = 0; i < num_components; i++)
1214             components[i] = emit_uint_const(ctx, bit_size,
1215                                             load_const->value[i].u32);
1216
1217          type = get_uvec_type(ctx, bit_size, num_components);
1218       }
1219       constant = spirv_builder_const_composite(&ctx->builder, type,
1220                                                components, num_components);
1221    } else {
1222       assert(num_components == 1);
1223       if (bit_size == 1)
1224          constant = spirv_builder_const_bool(&ctx->builder,
1225                                              load_const->value[0].b);
1226       else
1227          constant = emit_uint_const(ctx, bit_size, load_const->value[0].u32);
1228    }
1229
1230    if (bit_size == 1)
1231       constant = bvec_to_uvec(ctx, constant, num_components);
1232
1233    store_ssa_def(ctx, &load_const->def, constant);
1234 }
1235
1236 static void
1237 emit_load_ubo(struct ntv_context *ctx, nir_intrinsic_instr *intr)
1238 {
1239    nir_const_value *const_block_index = nir_src_as_const_value(intr->src[0]);
1240    assert(const_block_index); // no dynamic indexing for now
1241    assert(const_block_index->u32 == 0); // we only support the default UBO for now
1242
1243    nir_const_value *const_offset = nir_src_as_const_value(intr->src[1]);
1244    if (const_offset) {
1245       SpvId uvec4_type = get_uvec_type(ctx, 32, 4);
1246       SpvId pointer_type = spirv_builder_type_pointer(&ctx->builder,
1247                                                       SpvStorageClassUniform,
1248                                                       uvec4_type);
1249
1250       unsigned idx = const_offset->u32;
1251       SpvId member = emit_uint_const(ctx, 32, 0);
1252       SpvId offset = emit_uint_const(ctx, 32, idx);
1253       SpvId offsets[] = { member, offset };
1254       SpvId ptr = spirv_builder_emit_access_chain(&ctx->builder, pointer_type,
1255                                                   ctx->ubos[0], offsets,
1256                                                   ARRAY_SIZE(offsets));
1257       SpvId result = spirv_builder_emit_load(&ctx->builder, uvec4_type, ptr);
1258
1259       SpvId type = get_dest_uvec_type(ctx, &intr->dest);
1260       unsigned num_components = nir_dest_num_components(intr->dest);
1261       if (num_components == 1) {
1262          uint32_t components[] = { 0 };
1263          result = spirv_builder_emit_composite_extract(&ctx->builder,
1264                                                        type,
1265                                                        result, components,
1266                                                        1);
1267       } else if (num_components < 4) {
1268          SpvId constituents[num_components];
1269          SpvId uint_type = spirv_builder_type_uint(&ctx->builder, 32);
1270          for (uint32_t i = 0; i < num_components; ++i)
1271             constituents[i] = spirv_builder_emit_composite_extract(&ctx->builder,
1272                                                                    uint_type,
1273                                                                    result, &i,
1274                                                                    1);
1275
1276          result = spirv_builder_emit_composite_construct(&ctx->builder,
1277                                                          type,
1278                                                          constituents,
1279                                                          num_components);
1280       }
1281
1282       store_dest(ctx, &intr->dest, result, nir_type_uint);
1283    } else
1284       unreachable("uniform-addressing not yet supported");
1285 }
1286
1287 static void
1288 emit_discard(struct ntv_context *ctx, nir_intrinsic_instr *intr)
1289 {
1290    assert(ctx->block_started);
1291    spirv_builder_emit_kill(&ctx->builder);
1292    /* discard is weird in NIR, so let's just create an unreachable block after
1293       it and hope that the vulkan driver will DCE any instructinos in it. */
1294    spirv_builder_label(&ctx->builder, spirv_builder_new_id(&ctx->builder));
1295 }
1296
1297 static void
1298 emit_load_deref(struct ntv_context *ctx, nir_intrinsic_instr *intr)
1299 {
1300    SpvId ptr = get_src(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(ctx, &intr->dest, result, nir_type_uint);
1310 }
1311
1312 static void
1313 emit_store_deref(struct ntv_context *ctx, nir_intrinsic_instr *intr)
1314 {
1315    SpvId ptr = get_src(ctx, &intr->src[0]);
1316    SpvId src = get_src(ctx, &intr->src[1]);
1317
1318    nir_variable *var = nir_intrinsic_get_var(intr, 0);
1319    SpvId type = get_glsl_type(ctx, glsl_without_array(var->type));
1320    SpvId result = emit_bitcast(ctx, type, src);
1321    spirv_builder_emit_store(&ctx->builder, ptr, result);
1322 }
1323
1324 static SpvId
1325 create_builtin_var(struct ntv_context *ctx, SpvId var_type,
1326                    SpvStorageClass storage_class,
1327                    const char *name, SpvBuiltIn builtin)
1328 {
1329    SpvId pointer_type = spirv_builder_type_pointer(&ctx->builder,
1330                                                    storage_class,
1331                                                    var_type);
1332    SpvId var = spirv_builder_emit_var(&ctx->builder, pointer_type,
1333                                       storage_class);
1334    spirv_builder_emit_name(&ctx->builder, var, name);
1335    spirv_builder_emit_builtin(&ctx->builder, var, builtin);
1336
1337    assert(ctx->num_entry_ifaces < ARRAY_SIZE(ctx->entry_ifaces));
1338    ctx->entry_ifaces[ctx->num_entry_ifaces++] = var;
1339    return var;
1340 }
1341
1342 static void
1343 emit_load_front_face(struct ntv_context *ctx, nir_intrinsic_instr *intr)
1344 {
1345    SpvId var_type = spirv_builder_type_bool(&ctx->builder);
1346    if (!ctx->front_face_var)
1347       ctx->front_face_var = create_builtin_var(ctx, var_type,
1348                                                SpvStorageClassInput,
1349                                                "gl_FrontFacing",
1350                                                SpvBuiltInFrontFacing);
1351
1352    SpvId result = spirv_builder_emit_load(&ctx->builder, var_type,
1353                                           ctx->front_face_var);
1354    assert(1 == nir_dest_num_components(intr->dest));
1355    store_dest(ctx, &intr->dest, result, nir_type_bool);
1356 }
1357
1358 static void
1359 emit_load_instance_id(struct ntv_context *ctx, nir_intrinsic_instr *intr)
1360 {
1361    SpvId var_type = spirv_builder_type_uint(&ctx->builder, 32);
1362    if (!ctx->instance_id_var)
1363       ctx->instance_id_var = create_builtin_var(ctx, var_type,
1364                                                SpvStorageClassInput,
1365                                                "gl_InstanceId",
1366                                                SpvBuiltInInstanceIndex);
1367
1368    SpvId result = spirv_builder_emit_load(&ctx->builder, var_type,
1369                                           ctx->instance_id_var);
1370    assert(1 == nir_dest_num_components(intr->dest));
1371    store_dest(ctx, &intr->dest, result, nir_type_uint);
1372 }
1373
1374 static void
1375 emit_load_vertex_id(struct ntv_context *ctx, nir_intrinsic_instr *intr)
1376 {
1377    SpvId var_type = spirv_builder_type_uint(&ctx->builder, 32);
1378    if (!ctx->vertex_id_var)
1379       ctx->vertex_id_var = create_builtin_var(ctx, var_type,
1380                                                SpvStorageClassInput,
1381                                                "gl_VertexID",
1382                                                SpvBuiltInVertexIndex);
1383
1384    SpvId result = spirv_builder_emit_load(&ctx->builder, var_type,
1385                                           ctx->vertex_id_var);
1386    assert(1 == nir_dest_num_components(intr->dest));
1387    store_dest(ctx, &intr->dest, result, nir_type_uint);
1388 }
1389
1390 static void
1391 emit_intrinsic(struct ntv_context *ctx, nir_intrinsic_instr *intr)
1392 {
1393    switch (intr->intrinsic) {
1394    case nir_intrinsic_load_ubo:
1395       emit_load_ubo(ctx, intr);
1396       break;
1397
1398    case nir_intrinsic_discard:
1399       emit_discard(ctx, intr);
1400       break;
1401
1402    case nir_intrinsic_load_deref:
1403       emit_load_deref(ctx, intr);
1404       break;
1405
1406    case nir_intrinsic_store_deref:
1407       emit_store_deref(ctx, intr);
1408       break;
1409
1410    case nir_intrinsic_load_front_face:
1411       emit_load_front_face(ctx, intr);
1412       break;
1413
1414    case nir_intrinsic_load_instance_id:
1415       emit_load_instance_id(ctx, intr);
1416       break;
1417
1418    case nir_intrinsic_load_vertex_id:
1419       emit_load_vertex_id(ctx, intr);
1420       break;
1421
1422    default:
1423       fprintf(stderr, "emit_intrinsic: not implemented (%s)\n",
1424               nir_intrinsic_infos[intr->intrinsic].name);
1425       unreachable("unsupported intrinsic");
1426    }
1427 }
1428
1429 static void
1430 emit_undef(struct ntv_context *ctx, nir_ssa_undef_instr *undef)
1431 {
1432    SpvId type = get_uvec_type(ctx, undef->def.bit_size,
1433                               undef->def.num_components);
1434
1435    store_ssa_def(ctx, &undef->def,
1436                  spirv_builder_emit_undef(&ctx->builder, type));
1437 }
1438
1439 static SpvId
1440 get_src_float(struct ntv_context *ctx, nir_src *src)
1441 {
1442    SpvId def = get_src(ctx, src);
1443    unsigned num_components = nir_src_num_components(*src);
1444    unsigned bit_size = nir_src_bit_size(*src);
1445    return bitcast_to_fvec(ctx, def, bit_size, num_components);
1446 }
1447
1448 static SpvId
1449 get_src_int(struct ntv_context *ctx, nir_src *src)
1450 {
1451    SpvId def = get_src(ctx, src);
1452    unsigned num_components = nir_src_num_components(*src);
1453    unsigned bit_size = nir_src_bit_size(*src);
1454    return bitcast_to_ivec(ctx, def, bit_size, num_components);
1455 }
1456
1457 static void
1458 emit_tex(struct ntv_context *ctx, nir_tex_instr *tex)
1459 {
1460    assert(tex->op == nir_texop_tex ||
1461           tex->op == nir_texop_txb ||
1462           tex->op == nir_texop_txl ||
1463           tex->op == nir_texop_txd ||
1464           tex->op == nir_texop_txf ||
1465           tex->op == nir_texop_txs);
1466    assert(tex->texture_index == tex->sampler_index);
1467
1468    SpvId coord = 0, proj = 0, bias = 0, lod = 0, dref = 0, dx = 0, dy = 0,
1469          offset = 0;
1470    unsigned coord_components = 0;
1471    for (unsigned i = 0; i < tex->num_srcs; i++) {
1472       switch (tex->src[i].src_type) {
1473       case nir_tex_src_coord:
1474          if (tex->op == nir_texop_txf)
1475             coord = get_src_int(ctx, &tex->src[i].src);
1476          else
1477             coord = get_src_float(ctx, &tex->src[i].src);
1478          coord_components = nir_src_num_components(tex->src[i].src);
1479          break;
1480
1481       case nir_tex_src_projector:
1482          assert(nir_src_num_components(tex->src[i].src) == 1);
1483          proj = get_src_float(ctx, &tex->src[i].src);
1484          assert(proj != 0);
1485          break;
1486
1487       case nir_tex_src_offset:
1488          offset = get_src_int(ctx, &tex->src[i].src);
1489          break;
1490
1491       case nir_tex_src_bias:
1492          assert(tex->op == nir_texop_txb);
1493          bias = get_src_float(ctx, &tex->src[i].src);
1494          assert(bias != 0);
1495          break;
1496
1497       case nir_tex_src_lod:
1498          assert(nir_src_num_components(tex->src[i].src) == 1);
1499          if (tex->op == nir_texop_txf ||
1500              tex->op == nir_texop_txs)
1501             lod = get_src_int(ctx, &tex->src[i].src);
1502          else
1503             lod = get_src_float(ctx, &tex->src[i].src);
1504          assert(lod != 0);
1505          break;
1506
1507       case nir_tex_src_comparator:
1508          assert(nir_src_num_components(tex->src[i].src) == 1);
1509          dref = get_src_float(ctx, &tex->src[i].src);
1510          assert(dref != 0);
1511          break;
1512
1513       case nir_tex_src_ddx:
1514          dx = get_src_float(ctx, &tex->src[i].src);
1515          assert(dx != 0);
1516          break;
1517
1518       case nir_tex_src_ddy:
1519          dy = get_src_float(ctx, &tex->src[i].src);
1520          assert(dy != 0);
1521          break;
1522
1523       default:
1524          fprintf(stderr, "texture source: %d\n", tex->src[i].src_type);
1525          unreachable("unknown texture source");
1526       }
1527    }
1528
1529    if (lod == 0 && ctx->stage != MESA_SHADER_FRAGMENT) {
1530       lod = emit_float_const(ctx, 32, 0.0f);
1531       assert(lod != 0);
1532    }
1533
1534    SpvId image_type = ctx->image_types[tex->texture_index];
1535    SpvId sampled_type = spirv_builder_type_sampled_image(&ctx->builder,
1536                                                          image_type);
1537
1538    assert(ctx->samplers_used & (1u << tex->texture_index));
1539    SpvId load = spirv_builder_emit_load(&ctx->builder, sampled_type,
1540                                         ctx->samplers[tex->texture_index]);
1541
1542    SpvId dest_type = get_dest_type(ctx, &tex->dest, tex->dest_type);
1543
1544    if (tex->op == nir_texop_txs) {
1545       SpvId image = spirv_builder_emit_image(&ctx->builder, image_type, load);
1546       SpvId result = spirv_builder_emit_image_query_size(&ctx->builder,
1547                                                          dest_type, image,
1548                                                          lod);
1549       store_dest(ctx, &tex->dest, result, tex->dest_type);
1550       return;
1551    }
1552
1553    if (proj && coord_components > 0) {
1554       SpvId constituents[coord_components + 1];
1555       if (coord_components == 1)
1556          constituents[0] = coord;
1557       else {
1558          assert(coord_components > 1);
1559          SpvId float_type = spirv_builder_type_float(&ctx->builder, 32);
1560          for (uint32_t i = 0; i < coord_components; ++i)
1561             constituents[i] = spirv_builder_emit_composite_extract(&ctx->builder,
1562                                                  float_type,
1563                                                  coord,
1564                                                  &i, 1);
1565       }
1566
1567       constituents[coord_components++] = proj;
1568
1569       SpvId vec_type = get_fvec_type(ctx, 32, coord_components);
1570       coord = spirv_builder_emit_composite_construct(&ctx->builder,
1571                                                             vec_type,
1572                                                             constituents,
1573                                                             coord_components);
1574    }
1575
1576    SpvId actual_dest_type = dest_type;
1577    if (dref)
1578       actual_dest_type = spirv_builder_type_float(&ctx->builder, 32);
1579
1580    SpvId result;
1581    if (tex->op == nir_texop_txf) {
1582       SpvId image = spirv_builder_emit_image(&ctx->builder, image_type, load);
1583       result = spirv_builder_emit_image_fetch(&ctx->builder, dest_type,
1584                                               image, coord, lod);
1585    } else {
1586       result = spirv_builder_emit_image_sample(&ctx->builder,
1587                                                actual_dest_type, load,
1588                                                coord,
1589                                                proj != 0,
1590                                                lod, bias, dref, dx, dy,
1591                                                offset);
1592    }
1593
1594    spirv_builder_emit_decoration(&ctx->builder, result,
1595                                  SpvDecorationRelaxedPrecision);
1596
1597    if (dref && nir_dest_num_components(tex->dest) > 1) {
1598       SpvId components[4] = { result, result, result, result };
1599       result = spirv_builder_emit_composite_construct(&ctx->builder,
1600                                                       dest_type,
1601                                                       components,
1602                                                       4);
1603    }
1604
1605    store_dest(ctx, &tex->dest, result, tex->dest_type);
1606 }
1607
1608 static void
1609 start_block(struct ntv_context *ctx, SpvId label)
1610 {
1611    /* terminate previous block if needed */
1612    if (ctx->block_started)
1613       spirv_builder_emit_branch(&ctx->builder, label);
1614
1615    /* start new block */
1616    spirv_builder_label(&ctx->builder, label);
1617    ctx->block_started = true;
1618 }
1619
1620 static void
1621 branch(struct ntv_context *ctx, SpvId label)
1622 {
1623    assert(ctx->block_started);
1624    spirv_builder_emit_branch(&ctx->builder, label);
1625    ctx->block_started = false;
1626 }
1627
1628 static void
1629 branch_conditional(struct ntv_context *ctx, SpvId condition, SpvId then_id,
1630                    SpvId else_id)
1631 {
1632    assert(ctx->block_started);
1633    spirv_builder_emit_branch_conditional(&ctx->builder, condition,
1634                                          then_id, else_id);
1635    ctx->block_started = false;
1636 }
1637
1638 static void
1639 emit_jump(struct ntv_context *ctx, nir_jump_instr *jump)
1640 {
1641    switch (jump->type) {
1642    case nir_jump_break:
1643       assert(ctx->loop_break);
1644       branch(ctx, ctx->loop_break);
1645       break;
1646
1647    case nir_jump_continue:
1648       assert(ctx->loop_cont);
1649       branch(ctx, ctx->loop_cont);
1650       break;
1651
1652    default:
1653       unreachable("Unsupported jump type\n");
1654    }
1655 }
1656
1657 static void
1658 emit_deref_var(struct ntv_context *ctx, nir_deref_instr *deref)
1659 {
1660    assert(deref->deref_type == nir_deref_type_var);
1661
1662    struct hash_entry *he = _mesa_hash_table_search(ctx->vars, deref->var);
1663    assert(he);
1664    SpvId result = (SpvId)(intptr_t)he->data;
1665    /* uint is a bit of a lie here, it's really just an opaque type */
1666    store_dest(ctx, &deref->dest, result, nir_type_uint);
1667 }
1668
1669 static void
1670 emit_deref_array(struct ntv_context *ctx, nir_deref_instr *deref)
1671 {
1672    assert(deref->deref_type == nir_deref_type_array);
1673    nir_variable *var = nir_deref_instr_get_variable(deref);
1674
1675    SpvStorageClass storage_class;
1676    switch (var->data.mode) {
1677    case nir_var_shader_in:
1678       storage_class = SpvStorageClassInput;
1679       break;
1680
1681    case nir_var_shader_out:
1682       storage_class = SpvStorageClassOutput;
1683       break;
1684
1685    default:
1686       unreachable("Unsupported nir_variable_mode\n");
1687    }
1688
1689    SpvId index = get_src(ctx, &deref->arr.index);
1690
1691    SpvId ptr_type = spirv_builder_type_pointer(&ctx->builder,
1692                                                storage_class,
1693                                                get_glsl_type(ctx, deref->type));
1694
1695    SpvId result = spirv_builder_emit_access_chain(&ctx->builder,
1696                                                   ptr_type,
1697                                                   get_src(ctx, &deref->parent),
1698                                                   &index, 1);
1699    /* uint is a bit of a lie here, it's really just an opaque type */
1700    store_dest(ctx, &deref->dest, result, nir_type_uint);
1701 }
1702
1703 static void
1704 emit_deref(struct ntv_context *ctx, nir_deref_instr *deref)
1705 {
1706    switch (deref->deref_type) {
1707    case nir_deref_type_var:
1708       emit_deref_var(ctx, deref);
1709       break;
1710
1711    case nir_deref_type_array:
1712       emit_deref_array(ctx, deref);
1713       break;
1714
1715    default:
1716       unreachable("unexpected deref_type");
1717    }
1718 }
1719
1720 static void
1721 emit_block(struct ntv_context *ctx, struct nir_block *block)
1722 {
1723    start_block(ctx, block_label(ctx, block));
1724    nir_foreach_instr(instr, block) {
1725       switch (instr->type) {
1726       case nir_instr_type_alu:
1727          emit_alu(ctx, nir_instr_as_alu(instr));
1728          break;
1729       case nir_instr_type_intrinsic:
1730          emit_intrinsic(ctx, nir_instr_as_intrinsic(instr));
1731          break;
1732       case nir_instr_type_load_const:
1733          emit_load_const(ctx, nir_instr_as_load_const(instr));
1734          break;
1735       case nir_instr_type_ssa_undef:
1736          emit_undef(ctx, nir_instr_as_ssa_undef(instr));
1737          break;
1738       case nir_instr_type_tex:
1739          emit_tex(ctx, nir_instr_as_tex(instr));
1740          break;
1741       case nir_instr_type_phi:
1742          unreachable("nir_instr_type_phi not supported");
1743          break;
1744       case nir_instr_type_jump:
1745          emit_jump(ctx, nir_instr_as_jump(instr));
1746          break;
1747       case nir_instr_type_call:
1748          unreachable("nir_instr_type_call not supported");
1749          break;
1750       case nir_instr_type_parallel_copy:
1751          unreachable("nir_instr_type_parallel_copy not supported");
1752          break;
1753       case nir_instr_type_deref:
1754          emit_deref(ctx, nir_instr_as_deref(instr));
1755          break;
1756       }
1757    }
1758 }
1759
1760 static void
1761 emit_cf_list(struct ntv_context *ctx, struct exec_list *list);
1762
1763 static SpvId
1764 get_src_bool(struct ntv_context *ctx, nir_src *src)
1765 {
1766    SpvId def = get_src(ctx, src);
1767    assert(nir_src_bit_size(*src) == 1);
1768    unsigned num_components = nir_src_num_components(*src);
1769    return uvec_to_bvec(ctx, def, num_components);
1770 }
1771
1772 static void
1773 emit_if(struct ntv_context *ctx, nir_if *if_stmt)
1774 {
1775    SpvId condition = get_src_bool(ctx, &if_stmt->condition);
1776
1777    SpvId header_id = spirv_builder_new_id(&ctx->builder);
1778    SpvId then_id = block_label(ctx, nir_if_first_then_block(if_stmt));
1779    SpvId endif_id = spirv_builder_new_id(&ctx->builder);
1780    SpvId else_id = endif_id;
1781
1782    bool has_else = !exec_list_is_empty(&if_stmt->else_list);
1783    if (has_else) {
1784       assert(nir_if_first_else_block(if_stmt)->index < ctx->num_blocks);
1785       else_id = block_label(ctx, nir_if_first_else_block(if_stmt));
1786    }
1787
1788    /* create a header-block */
1789    start_block(ctx, header_id);
1790    spirv_builder_emit_selection_merge(&ctx->builder, endif_id,
1791                                       SpvSelectionControlMaskNone);
1792    branch_conditional(ctx, condition, then_id, else_id);
1793
1794    emit_cf_list(ctx, &if_stmt->then_list);
1795
1796    if (has_else) {
1797       if (ctx->block_started)
1798          branch(ctx, endif_id);
1799
1800       emit_cf_list(ctx, &if_stmt->else_list);
1801    }
1802
1803    start_block(ctx, endif_id);
1804 }
1805
1806 static void
1807 emit_loop(struct ntv_context *ctx, nir_loop *loop)
1808 {
1809    SpvId header_id = spirv_builder_new_id(&ctx->builder);
1810    SpvId begin_id = block_label(ctx, nir_loop_first_block(loop));
1811    SpvId break_id = spirv_builder_new_id(&ctx->builder);
1812    SpvId cont_id = spirv_builder_new_id(&ctx->builder);
1813
1814    /* create a header-block */
1815    start_block(ctx, header_id);
1816    spirv_builder_loop_merge(&ctx->builder, break_id, cont_id, SpvLoopControlMaskNone);
1817    branch(ctx, begin_id);
1818
1819    SpvId save_break = ctx->loop_break;
1820    SpvId save_cont = ctx->loop_cont;
1821    ctx->loop_break = break_id;
1822    ctx->loop_cont = cont_id;
1823
1824    emit_cf_list(ctx, &loop->body);
1825
1826    ctx->loop_break = save_break;
1827    ctx->loop_cont = save_cont;
1828
1829    branch(ctx, cont_id);
1830    start_block(ctx, cont_id);
1831    branch(ctx, header_id);
1832
1833    start_block(ctx, break_id);
1834 }
1835
1836 static void
1837 emit_cf_list(struct ntv_context *ctx, struct exec_list *list)
1838 {
1839    foreach_list_typed(nir_cf_node, node, node, list) {
1840       switch (node->type) {
1841       case nir_cf_node_block:
1842          emit_block(ctx, nir_cf_node_as_block(node));
1843          break;
1844
1845       case nir_cf_node_if:
1846          emit_if(ctx, nir_cf_node_as_if(node));
1847          break;
1848
1849       case nir_cf_node_loop:
1850          emit_loop(ctx, nir_cf_node_as_loop(node));
1851          break;
1852
1853       case nir_cf_node_function:
1854          unreachable("nir_cf_node_function not supported");
1855          break;
1856       }
1857    }
1858 }
1859
1860 struct spirv_shader *
1861 nir_to_spirv(struct nir_shader *s)
1862 {
1863    struct spirv_shader *ret = NULL;
1864
1865    struct ntv_context ctx = {};
1866
1867    switch (s->info.stage) {
1868    case MESA_SHADER_VERTEX:
1869    case MESA_SHADER_FRAGMENT:
1870    case MESA_SHADER_COMPUTE:
1871       spirv_builder_emit_cap(&ctx.builder, SpvCapabilityShader);
1872       break;
1873
1874    case MESA_SHADER_TESS_CTRL:
1875    case MESA_SHADER_TESS_EVAL:
1876       spirv_builder_emit_cap(&ctx.builder, SpvCapabilityTessellation);
1877       break;
1878
1879    case MESA_SHADER_GEOMETRY:
1880       spirv_builder_emit_cap(&ctx.builder, SpvCapabilityGeometry);
1881       break;
1882
1883    default:
1884       unreachable("invalid stage");
1885    }
1886
1887    // TODO: only enable when needed
1888    if (s->info.stage == MESA_SHADER_FRAGMENT) {
1889       spirv_builder_emit_cap(&ctx.builder, SpvCapabilitySampled1D);
1890       spirv_builder_emit_cap(&ctx.builder, SpvCapabilityImageQuery);
1891       spirv_builder_emit_cap(&ctx.builder, SpvCapabilityDerivativeControl);
1892    }
1893
1894    ctx.stage = s->info.stage;
1895    ctx.GLSL_std_450 = spirv_builder_import(&ctx.builder, "GLSL.std.450");
1896    spirv_builder_emit_source(&ctx.builder, SpvSourceLanguageGLSL, 450);
1897
1898    spirv_builder_emit_mem_model(&ctx.builder, SpvAddressingModelLogical,
1899                                 SpvMemoryModelGLSL450);
1900
1901    SpvExecutionModel exec_model;
1902    switch (s->info.stage) {
1903    case MESA_SHADER_VERTEX:
1904       exec_model = SpvExecutionModelVertex;
1905       break;
1906    case MESA_SHADER_TESS_CTRL:
1907       exec_model = SpvExecutionModelTessellationControl;
1908       break;
1909    case MESA_SHADER_TESS_EVAL:
1910       exec_model = SpvExecutionModelTessellationEvaluation;
1911       break;
1912    case MESA_SHADER_GEOMETRY:
1913       exec_model = SpvExecutionModelGeometry;
1914       break;
1915    case MESA_SHADER_FRAGMENT:
1916       exec_model = SpvExecutionModelFragment;
1917       break;
1918    case MESA_SHADER_COMPUTE:
1919       exec_model = SpvExecutionModelGLCompute;
1920       break;
1921    default:
1922       unreachable("invalid stage");
1923    }
1924
1925    SpvId type_void = spirv_builder_type_void(&ctx.builder);
1926    SpvId type_main = spirv_builder_type_function(&ctx.builder, type_void,
1927                                                  NULL, 0);
1928    SpvId entry_point = spirv_builder_new_id(&ctx.builder);
1929    spirv_builder_emit_name(&ctx.builder, entry_point, "main");
1930
1931    ctx.vars = _mesa_hash_table_create(NULL, _mesa_hash_pointer,
1932                                       _mesa_key_pointer_equal);
1933
1934    nir_foreach_variable(var, &s->inputs)
1935       emit_input(&ctx, var);
1936
1937    nir_foreach_variable(var, &s->outputs)
1938       emit_output(&ctx, var);
1939
1940    nir_foreach_variable(var, &s->uniforms)
1941       emit_uniform(&ctx, var);
1942
1943    if (s->info.stage == MESA_SHADER_FRAGMENT) {
1944       spirv_builder_emit_exec_mode(&ctx.builder, entry_point,
1945                                    SpvExecutionModeOriginUpperLeft);
1946       if (s->info.outputs_written & BITFIELD64_BIT(FRAG_RESULT_DEPTH))
1947          spirv_builder_emit_exec_mode(&ctx.builder, entry_point,
1948                                       SpvExecutionModeDepthReplacing);
1949    }
1950
1951
1952    spirv_builder_function(&ctx.builder, entry_point, type_void,
1953                                             SpvFunctionControlMaskNone,
1954                                             type_main);
1955
1956    nir_function_impl *entry = nir_shader_get_entrypoint(s);
1957    nir_metadata_require(entry, nir_metadata_block_index);
1958
1959    ctx.defs = (SpvId *)malloc(sizeof(SpvId) * entry->ssa_alloc);
1960    if (!ctx.defs)
1961       goto fail;
1962    ctx.num_defs = entry->ssa_alloc;
1963
1964    nir_index_local_regs(entry);
1965    ctx.regs = malloc(sizeof(SpvId) * entry->reg_alloc);
1966    if (!ctx.regs)
1967       goto fail;
1968    ctx.num_regs = entry->reg_alloc;
1969
1970    SpvId *block_ids = (SpvId *)malloc(sizeof(SpvId) * entry->num_blocks);
1971    if (!block_ids)
1972       goto fail;
1973
1974    for (int i = 0; i < entry->num_blocks; ++i)
1975       block_ids[i] = spirv_builder_new_id(&ctx.builder);
1976
1977    ctx.block_ids = block_ids;
1978    ctx.num_blocks = entry->num_blocks;
1979
1980    /* emit a block only for the variable declarations */
1981    start_block(&ctx, spirv_builder_new_id(&ctx.builder));
1982    foreach_list_typed(nir_register, reg, node, &entry->registers) {
1983       SpvId type = get_uvec_type(&ctx, reg->bit_size, reg->num_components);
1984       SpvId pointer_type = spirv_builder_type_pointer(&ctx.builder,
1985                                                       SpvStorageClassFunction,
1986                                                       type);
1987       SpvId var = spirv_builder_emit_var(&ctx.builder, pointer_type,
1988                                          SpvStorageClassFunction);
1989
1990       ctx.regs[reg->index] = var;
1991    }
1992
1993    emit_cf_list(&ctx, &entry->body);
1994
1995    free(ctx.defs);
1996
1997    spirv_builder_return(&ctx.builder); // doesn't belong here, but whatevz
1998    spirv_builder_function_end(&ctx.builder);
1999
2000    spirv_builder_emit_entry_point(&ctx.builder, exec_model, entry_point,
2001                                   "main", ctx.entry_ifaces,
2002                                   ctx.num_entry_ifaces);
2003
2004    size_t num_words = spirv_builder_get_num_words(&ctx.builder);
2005
2006    ret = CALLOC_STRUCT(spirv_shader);
2007    if (!ret)
2008       goto fail;
2009
2010    ret->words = MALLOC(sizeof(uint32_t) * num_words);
2011    if (!ret->words)
2012       goto fail;
2013
2014    ret->num_words = spirv_builder_get_words(&ctx.builder, ret->words, num_words);
2015    assert(ret->num_words == num_words);
2016
2017    return ret;
2018
2019 fail:
2020
2021    if (ret)
2022       spirv_shader_delete(ret);
2023
2024    if (ctx.vars)
2025       _mesa_hash_table_destroy(ctx.vars, NULL);
2026
2027    return NULL;
2028 }
2029
2030 void
2031 spirv_shader_delete(struct spirv_shader *s)
2032 {
2033    FREE(s->words);
2034    FREE(s);
2035 }