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    int var_location;
  39
  40    SpvId ubos[128];
  41    size_t num_ubos;
  42    SpvId samplers[PIPE_MAX_SAMPLERS];
  43    size_t num_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
  61 static SpvId
  62 get_fvec_constant(struct ntv_context *ctx, int bit_size, int num_components,
  63                   const float values[]);
  64
  65 static SpvId
  66 get_uvec_constant(struct ntv_context *ctx, int bit_size, int num_components,
  67                   const uint32_t values[]);
  68
  69 static SpvId
  70 emit_unop(struct ntv_context *ctx, SpvOp op, SpvId type, SpvId src);
  71
  72 static SpvId
  73 emit_binop(struct ntv_context *ctx, SpvOp op, SpvId type,
  74            SpvId src0, SpvId src1);
  75
  76 static SpvId
  77 emit_triop(struct ntv_context *ctx, SpvOp op, SpvId type,
  78            SpvId src0, SpvId src1, SpvId src2);
  79
  80 static SpvId
  81 get_bvec_type(struct ntv_context *ctx, int num_components)
  82 {
  83    SpvId bool_type = spirv_builder_type_bool(&ctx->builder);
  84    if (num_components > 1)
  85       return spirv_builder_type_vector(&ctx->builder, bool_type,
  86                                        num_components);
  87
  88    assert(num_components == 1);
  89    return bool_type;
  90 }
  91
  92 static SpvId
  93 block_label(struct ntv_context *ctx, nir_block *block)
  94 {
  95    assert(block->index < ctx->num_blocks);
  96    return ctx->block_ids[block->index];
  97 }
  98
  99 static SpvId
 100 get_fvec_type(struct ntv_context *ctx, unsigned bit_size, unsigned num_components)
 101 {
 102    assert(bit_size == 32); // only 32-bit floats supported so far
 103
 104    SpvId float_type = spirv_builder_type_float(&ctx->builder, bit_size);
 105    if (num_components > 1)
 106       return spirv_builder_type_vector(&ctx->builder, float_type,
 107                                        num_components);
 108
 109    assert(num_components == 1);
 110    return float_type;
 111 }
 112
 113 static SpvId
 114 get_ivec_type(struct ntv_context *ctx, unsigned bit_size, unsigned num_components)
 115 {
 116    assert(bit_size == 32); // only 32-bit ints supported so far
 117
 118    SpvId int_type = spirv_builder_type_int(&ctx->builder, bit_size);
 119    if (num_components > 1)
 120       return spirv_builder_type_vector(&ctx->builder, int_type,
 121                                        num_components);
 122
 123    assert(num_components == 1);
 124    return int_type;
 125 }
 126
 127 static SpvId
 128 get_uvec_type(struct ntv_context *ctx, unsigned bit_size, unsigned num_components)
 129 {
 130    assert(bit_size == 32); // only 32-bit uints supported so far
 131
 132    SpvId uint_type = spirv_builder_type_uint(&ctx->builder, bit_size);
 133    if (num_components > 1)
 134       return spirv_builder_type_vector(&ctx->builder, uint_type,
 135                                        num_components);
 136
 137    assert(num_components == 1);
 138    return uint_type;
 139 }
 140
 141 static SpvId
 142 get_dest_uvec_type(struct ntv_context *ctx, nir_dest *dest)
 143 {
 144    return get_uvec_type(ctx, nir_dest_bit_size(*dest),
 145                              nir_dest_num_components(*dest));
 146 }
 147
 148 static SpvId
 149 get_glsl_basetype(struct ntv_context *ctx, enum glsl_base_type type)
 150 {
 151    switch (type) {
 152    case GLSL_TYPE_FLOAT:
 153       return spirv_builder_type_float(&ctx->builder, 32);
 154
 155    case GLSL_TYPE_INT:
 156       return spirv_builder_type_int(&ctx->builder, 32);
 157
 158    case GLSL_TYPE_UINT:
 159       return spirv_builder_type_uint(&ctx->builder, 32);
 160    /* TODO: handle more types */
 161
 162    default:
 163       unreachable("unknown GLSL type");
 164    }
 165 }
 166
 167 static SpvId
 168 get_glsl_type(struct ntv_context *ctx, const struct glsl_type *type)
 169 {
 170    assert(type);
 171    if (glsl_type_is_scalar(type))
 172       return get_glsl_basetype(ctx, glsl_get_base_type(type));
 173
 174    if (glsl_type_is_vector(type))
 175       return spirv_builder_type_vector(&ctx->builder,
 176          get_glsl_basetype(ctx, glsl_get_base_type(type)),
 177          glsl_get_vector_elements(type));
 178
 179    if (glsl_type_is_array(type)) {
 180       SpvId ret = spirv_builder_type_array(&ctx->builder,
 181          get_glsl_type(ctx, glsl_get_array_element(type)),
 182          spirv_builder_const_uint(&ctx->builder, 32, glsl_get_length(type)));
 183       uint32_t stride = glsl_get_explicit_stride(type);
 184       if (stride)
 185          spirv_builder_emit_array_stride(&ctx->builder, ret, stride);
 186       return ret;
 187    }
 188
 189
 190    unreachable("we shouldn't get here, I think...");
 191 }
 192
 193 static void
 194 emit_input(struct ntv_context *ctx, struct nir_variable *var)
 195 {
 196    SpvId var_type = get_glsl_type(ctx, var->type);
 197    SpvId pointer_type = spirv_builder_type_pointer(&ctx->builder,
 198                                                    SpvStorageClassInput,
 199                                                    var_type);
 200    SpvId var_id = spirv_builder_emit_var(&ctx->builder, pointer_type,
 201                                          SpvStorageClassInput);
 202
 203    if (var->name)
 204       spirv_builder_emit_name(&ctx->builder, var_id, var->name);
 205
 206    if (ctx->stage == MESA_SHADER_FRAGMENT) {
 207       if (var->data.location >= VARYING_SLOT_VAR0 ||
 208           (var->data.location >= VARYING_SLOT_COL0 &&
 209            var->data.location <= VARYING_SLOT_TEX7)) {
 210          spirv_builder_emit_location(&ctx->builder, var_id,
 211                                      ctx->var_location++);
 212       } else {
 213          switch (var->data.location) {
 214          case VARYING_SLOT_POS:
 215             spirv_builder_emit_builtin(&ctx->builder, var_id, SpvBuiltInFragCoord);
 216             break;
 217
 218          case VARYING_SLOT_PNTC:
 219             spirv_builder_emit_builtin(&ctx->builder, var_id, SpvBuiltInPointCoord);
 220             break;
 221
 222          default:
 223             unreachable("unknown varying slot");
 224          }
 225       }
 226    } else {
 227       spirv_builder_emit_location(&ctx->builder, var_id,
 228                                   var->data.driver_location);
 229    }
 230
 231    if (var->data.location_frac)
 232       spirv_builder_emit_component(&ctx->builder, var_id,
 233                                    var->data.location_frac);
 234
 235    if (var->data.interpolation == INTERP_MODE_FLAT)
 236       spirv_builder_emit_decoration(&ctx->builder, var_id, SpvDecorationFlat);
 237
 238    _mesa_hash_table_insert(ctx->vars, var, (void *)(intptr_t)var_id);
 239
 240    assert(ctx->num_entry_ifaces < ARRAY_SIZE(ctx->entry_ifaces));
 241    ctx->entry_ifaces[ctx->num_entry_ifaces++] = var_id;
 242 }
 243
 244 static void
 245 emit_output(struct ntv_context *ctx, struct nir_variable *var)
 246 {
 247    SpvId var_type = get_glsl_type(ctx, var->type);
 248    SpvId pointer_type = spirv_builder_type_pointer(&ctx->builder,
 249                                                    SpvStorageClassOutput,
 250                                                    var_type);
 251    SpvId var_id = spirv_builder_emit_var(&ctx->builder, pointer_type,
 252                                          SpvStorageClassOutput);
 253    if (var->name)
 254       spirv_builder_emit_name(&ctx->builder, var_id, var->name);
 255
 256
 257    if (ctx->stage == MESA_SHADER_VERTEX) {
 258       if (var->data.location >= VARYING_SLOT_VAR0 ||
 259           (var->data.location >= VARYING_SLOT_COL0 &&
 260            var->data.location <= VARYING_SLOT_TEX7)) {
 261          spirv_builder_emit_location(&ctx->builder, var_id,
 262                                      ctx->var_location++);
 263       } else {
 264          switch (var->data.location) {
 265          case VARYING_SLOT_POS:
 266             spirv_builder_emit_builtin(&ctx->builder, var_id, SpvBuiltInPosition);
 267             break;
 268
 269          case VARYING_SLOT_PSIZ:
 270             spirv_builder_emit_builtin(&ctx->builder, var_id, SpvBuiltInPointSize);
 271             break;
 272
 273          case VARYING_SLOT_CLIP_DIST0:
 274             assert(glsl_type_is_array(var->type));
 275             spirv_builder_emit_builtin(&ctx->builder, var_id, SpvBuiltInClipDistance);
 276             break;
 277
 278          default:
 279             unreachable("unknown varying slot");
 280          }
 281       }
 282    } else if (ctx->stage == MESA_SHADER_FRAGMENT) {
 283       switch (var->data.location) {
 284       case FRAG_RESULT_DEPTH:
 285          spirv_builder_emit_builtin(&ctx->builder, var_id, SpvBuiltInFragDepth);
 286          break;
 287
 288       default:
 289          spirv_builder_emit_location(&ctx->builder, var_id,
 290                                      var->data.driver_location);
 291       }
 292    }
 293
 294    if (var->data.location_frac)
 295       spirv_builder_emit_component(&ctx->builder, var_id,
 296                                    var->data.location_frac);
 297
 298    _mesa_hash_table_insert(ctx->vars, var, (void *)(intptr_t)var_id);
 299
 300    assert(ctx->num_entry_ifaces < ARRAY_SIZE(ctx->entry_ifaces));
 301    ctx->entry_ifaces[ctx->num_entry_ifaces++] = var_id;
 302 }
 303
 304 static SpvDim
 305 type_to_dim(enum glsl_sampler_dim gdim, bool *is_ms)
 306 {
 307    *is_ms = false;
 308    switch (gdim) {
 309    case GLSL_SAMPLER_DIM_1D:
 310       return SpvDim1D;
 311    case GLSL_SAMPLER_DIM_2D:
 312       return SpvDim2D;
 313    case GLSL_SAMPLER_DIM_RECT:
 314       return SpvDimRect;
 315    case GLSL_SAMPLER_DIM_CUBE:
 316       return SpvDimCube;
 317    case GLSL_SAMPLER_DIM_3D:
 318       return SpvDim3D;
 319    case GLSL_SAMPLER_DIM_MS:
 320       *is_ms = true;
 321       return SpvDim2D;
 322    default:
 323       fprintf(stderr, "unknown sampler type %d\n", gdim);
 324       break;
 325    }
 326    return SpvDim2D;
 327 }
 328
 329 static void
 330 emit_sampler(struct ntv_context *ctx, struct nir_variable *var)
 331 {
 332    bool is_ms;
 333    SpvDim dimension = type_to_dim(glsl_get_sampler_dim(var->type), &is_ms);
 334    SpvId float_type = spirv_builder_type_float(&ctx->builder, 32);
 335    SpvId image_type = spirv_builder_type_image(&ctx->builder, float_type,
 336                             dimension, false, glsl_sampler_type_is_array(var->type), is_ms, 1,
 337                             SpvImageFormatUnknown);
 338
 339    SpvId sampled_type = spirv_builder_type_sampled_image(&ctx->builder,
 340                                                          image_type);
 341    SpvId pointer_type = spirv_builder_type_pointer(&ctx->builder,
 342                                                    SpvStorageClassUniformConstant,
 343                                                    sampled_type);
 344    SpvId var_id = spirv_builder_emit_var(&ctx->builder, pointer_type,
 345                                          SpvStorageClassUniformConstant);
 346
 347    if (var->name)
 348       spirv_builder_emit_name(&ctx->builder, var_id, var->name);
 349
 350    assert(ctx->num_samplers < ARRAY_SIZE(ctx->samplers));
 351    ctx->samplers[ctx->num_samplers++] = var_id;
 352
 353    spirv_builder_emit_descriptor_set(&ctx->builder, var_id,
 354                                      var->data.descriptor_set);
 355    spirv_builder_emit_binding(&ctx->builder, var_id, var->data.binding);
 356 }
 357
 358 static void
 359 emit_ubo(struct ntv_context *ctx, struct nir_variable *var)
 360 {
 361    uint32_t size = glsl_count_attribute_slots(var->type, false);
 362    SpvId vec4_type = get_uvec_type(ctx, 32, 4);
 363    SpvId array_length = spirv_builder_const_uint(&ctx->builder, 32, size);
 364    SpvId array_type = spirv_builder_type_array(&ctx->builder, vec4_type,
 365                                                array_length);
 366    spirv_builder_emit_array_stride(&ctx->builder, array_type, 16);
 367
 368    // wrap UBO-array in a struct
 369    SpvId struct_type = spirv_builder_type_struct(&ctx->builder, &array_type, 1);
 370    if (var->name) {
 371       char struct_name[100];
 372       snprintf(struct_name, sizeof(struct_name), "struct_%s", var->name);
 373       spirv_builder_emit_name(&ctx->builder, struct_type, struct_name);
 374    }
 375
 376    spirv_builder_emit_decoration(&ctx->builder, struct_type,
 377                                  SpvDecorationBlock);
 378    spirv_builder_emit_member_offset(&ctx->builder, struct_type, 0, 0);
 379
 380
 381    SpvId pointer_type = spirv_builder_type_pointer(&ctx->builder,
 382                                                    SpvStorageClassUniform,
 383                                                    struct_type);
 384
 385    SpvId var_id = spirv_builder_emit_var(&ctx->builder, pointer_type,
 386                                          SpvStorageClassUniform);
 387    if (var->name)
 388       spirv_builder_emit_name(&ctx->builder, var_id, var->name);
 389
 390    assert(ctx->num_ubos < ARRAY_SIZE(ctx->ubos));
 391    ctx->ubos[ctx->num_ubos++] = var_id;
 392
 393    spirv_builder_emit_descriptor_set(&ctx->builder, var_id,
 394                                      var->data.descriptor_set);
 395    spirv_builder_emit_binding(&ctx->builder, var_id, var->data.binding);
 396 }
 397
 398 static void
 399 emit_uniform(struct ntv_context *ctx, struct nir_variable *var)
 400 {
 401    if (var->data.mode == nir_var_mem_ubo)
 402       emit_ubo(ctx, var);
 403    else {
 404       assert(var->data.mode == nir_var_uniform);
 405       if (glsl_type_is_sampler(var->type))
 406          emit_sampler(ctx, var);
 407    }
 408 }
 409
 410 static SpvId
 411 get_src_uint_ssa(struct ntv_context *ctx, const nir_ssa_def *ssa)
 412 {
 413    assert(ssa->index < ctx->num_defs);
 414    assert(ctx->defs[ssa->index] != 0);
 415    return ctx->defs[ssa->index];
 416 }
 417
 418 static SpvId
 419 get_var_from_reg(struct ntv_context *ctx, nir_register *reg)
 420 {
 421    assert(reg->index < ctx->num_regs);
 422    assert(ctx->regs[reg->index] != 0);
 423    return ctx->regs[reg->index];
 424 }
 425
 426 static SpvId
 427 get_src_uint_reg(struct ntv_context *ctx, const nir_reg_src *reg)
 428 {
 429    assert(reg->reg);
 430    assert(!reg->indirect);
 431    assert(!reg->base_offset);
 432
 433    SpvId var = get_var_from_reg(ctx, reg->reg);
 434    SpvId type = get_uvec_type(ctx, reg->reg->bit_size, reg->reg->num_components);
 435    return spirv_builder_emit_load(&ctx->builder, type, var);
 436 }
 437
 438 static SpvId
 439 get_src_uint(struct ntv_context *ctx, nir_src *src)
 440 {
 441    if (src->is_ssa)
 442       return get_src_uint_ssa(ctx, src->ssa);
 443    else
 444       return get_src_uint_reg(ctx, &src->reg);
 445 }
 446
 447 static SpvId
 448 get_alu_src_uint(struct ntv_context *ctx, nir_alu_instr *alu, unsigned src)
 449 {
 450    assert(!alu->src[src].negate);
 451    assert(!alu->src[src].abs);
 452
 453    SpvId def = get_src_uint(ctx, &alu->src[src].src);
 454
 455    unsigned used_channels = 0;
 456    bool need_swizzle = false;
 457    for (unsigned i = 0; i < NIR_MAX_VEC_COMPONENTS; i++) {
 458       if (!nir_alu_instr_channel_used(alu, src, i))
 459          continue;
 460
 461       used_channels++;
 462
 463       if (alu->src[src].swizzle[i] != i)
 464          need_swizzle = true;
 465    }
 466    assert(used_channels != 0);
 467
 468    unsigned live_channels = nir_src_num_components(alu->src[src].src);
 469    if (used_channels != live_channels)
 470       need_swizzle = true;
 471
 472    if (!need_swizzle)
 473       return def;
 474
 475    int bit_size = nir_src_bit_size(alu->src[src].src);
 476
 477    SpvId uint_type = spirv_builder_type_uint(&ctx->builder, bit_size);
 478    if (used_channels == 1) {
 479       uint32_t indices[] =  { alu->src[src].swizzle[0] };
 480       return spirv_builder_emit_composite_extract(&ctx->builder, uint_type,
 481                                                   def, indices,
 482                                                   ARRAY_SIZE(indices));
 483    } else if (live_channels == 1) {
 484       SpvId uvec_type = spirv_builder_type_vector(&ctx->builder, uint_type,
 485                                                   used_channels);
 486
 487       SpvId constituents[NIR_MAX_VEC_COMPONENTS];
 488       for (unsigned i = 0; i < used_channels; ++i)
 489         constituents[i] = def;
 490
 491       return spirv_builder_emit_composite_construct(&ctx->builder, uvec_type,
 492                                                     constituents,
 493                                                     used_channels);
 494    } else {
 495       SpvId uvec_type = spirv_builder_type_vector(&ctx->builder, uint_type,
 496                                                   used_channels);
 497
 498       uint32_t components[NIR_MAX_VEC_COMPONENTS];
 499       size_t num_components = 0;
 500       for (unsigned i = 0; i < NIR_MAX_VEC_COMPONENTS; i++) {
 501          if (!nir_alu_instr_channel_used(alu, src, i))
 502             continue;
 503
 504          components[num_components++] = alu->src[src].swizzle[i];
 505       }
 506
 507       return spirv_builder_emit_vector_shuffle(&ctx->builder, uvec_type,
 508                                         def, def, components, num_components);
 509    }
 510 }
 511
 512 static void
 513 store_ssa_def_uint(struct ntv_context *ctx, nir_ssa_def *ssa, SpvId result)
 514 {
 515    assert(result != 0);
 516    assert(ssa->index < ctx->num_defs);
 517    ctx->defs[ssa->index] = result;
 518 }
 519
 520 static SpvId
 521 bvec_to_uvec(struct ntv_context *ctx, SpvId value, unsigned num_components)
 522 {
 523    SpvId otype = get_uvec_type(ctx, 32, num_components);
 524    uint32_t zeros[4] = { 0, 0, 0, 0 };
 525    uint32_t ones[4] = { 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff };
 526    SpvId zero = get_uvec_constant(ctx, 32, num_components, zeros);
 527    SpvId one = get_uvec_constant(ctx, 32, num_components, ones);
 528    return emit_triop(ctx, SpvOpSelect, otype, value, one, zero);
 529 }
 530
 531 static SpvId
 532 uvec_to_bvec(struct ntv_context *ctx, SpvId value, unsigned num_components)
 533 {
 534    SpvId type = get_bvec_type(ctx, num_components);
 535
 536    uint32_t zeros[NIR_MAX_VEC_COMPONENTS] = { 0 };
 537    SpvId zero = get_uvec_constant(ctx, 32, num_components, zeros);
 538
 539    return emit_binop(ctx, SpvOpINotEqual, type, value, zero);
 540 }
 541
 542 static SpvId
 543 bitcast_to_uvec(struct ntv_context *ctx, SpvId value, unsigned bit_size,
 544                 unsigned num_components)
 545 {
 546    SpvId type = get_uvec_type(ctx, bit_size, num_components);
 547    return emit_unop(ctx, SpvOpBitcast, type, value);
 548 }
 549
 550 static SpvId
 551 bitcast_to_ivec(struct ntv_context *ctx, SpvId value, unsigned bit_size,
 552                 unsigned num_components)
 553 {
 554    SpvId type = get_ivec_type(ctx, bit_size, num_components);
 555    return emit_unop(ctx, SpvOpBitcast, type, value);
 556 }
 557
 558 static SpvId
 559 bitcast_to_fvec(struct ntv_context *ctx, SpvId value, unsigned bit_size,
 560                unsigned num_components)
 561 {
 562    SpvId type = get_fvec_type(ctx, bit_size, num_components);
 563    return emit_unop(ctx, SpvOpBitcast, type, value);
 564 }
 565
 566 static void
 567 store_reg_def(struct ntv_context *ctx, nir_reg_dest *reg, SpvId result)
 568 {
 569    SpvId var = get_var_from_reg(ctx, reg->reg);
 570    assert(var);
 571    spirv_builder_emit_store(&ctx->builder, var, result);
 572 }
 573
 574 static void
 575 store_dest_uint(struct ntv_context *ctx, nir_dest *dest, SpvId result)
 576 {
 577    if (dest->is_ssa)
 578       store_ssa_def_uint(ctx, &dest->ssa, result);
 579    else
 580       store_reg_def(ctx, &dest->reg, result);
 581 }
 582
 583 static void
 584 store_dest(struct ntv_context *ctx, nir_dest *dest, SpvId result, nir_alu_type type)
 585 {
 586    unsigned num_components = nir_dest_num_components(*dest);
 587    unsigned bit_size = nir_dest_bit_size(*dest);
 588
 589    switch (nir_alu_type_get_base_type(type)) {
 590    case nir_type_bool:
 591       assert(bit_size == 1);
 592       result = bvec_to_uvec(ctx, result, num_components);
 593       break;
 594
 595    case nir_type_uint:
 596       break; /* nothing to do! */
 597
 598    case nir_type_int:
 599    case nir_type_float:
 600       result = bitcast_to_uvec(ctx, result, bit_size, num_components);
 601       break;
 602
 603    default:
 604       unreachable("unsupported nir_alu_type");
 605    }
 606
 607    store_dest_uint(ctx, dest, result);
 608 }
 609
 610 static SpvId
 611 emit_unop(struct ntv_context *ctx, SpvOp op, SpvId type, SpvId src)
 612 {
 613    return spirv_builder_emit_unop(&ctx->builder, op, type, src);
 614 }
 615
 616 static SpvId
 617 emit_binop(struct ntv_context *ctx, SpvOp op, SpvId type,
 618            SpvId src0, SpvId src1)
 619 {
 620    return spirv_builder_emit_binop(&ctx->builder, op, type, src0, src1);
 621 }
 622
 623 static SpvId
 624 emit_triop(struct ntv_context *ctx, SpvOp op, SpvId type,
 625            SpvId src0, SpvId src1, SpvId src2)
 626 {
 627    return spirv_builder_emit_triop(&ctx->builder, op, type, src0, src1, src2);
 628 }
 629
 630 static SpvId
 631 emit_builtin_unop(struct ntv_context *ctx, enum GLSLstd450 op, SpvId type,
 632                   SpvId src)
 633 {
 634    SpvId args[] = { src };
 635    return spirv_builder_emit_ext_inst(&ctx->builder, type, ctx->GLSL_std_450,
 636                                       op, args, ARRAY_SIZE(args));
 637 }
 638
 639 static SpvId
 640 emit_builtin_binop(struct ntv_context *ctx, enum GLSLstd450 op, SpvId type,
 641                    SpvId src0, SpvId src1)
 642 {
 643    SpvId args[] = { src0, src1 };
 644    return spirv_builder_emit_ext_inst(&ctx->builder, type, ctx->GLSL_std_450,
 645                                       op, args, ARRAY_SIZE(args));
 646 }
 647
 648 static SpvId
 649 get_fvec_constant(struct ntv_context *ctx, int bit_size, int num_components,
 650                   const float values[])
 651 {
 652    assert(bit_size == 32);
 653
 654    if (num_components > 1) {
 655       SpvId components[num_components];
 656       for (int i = 0; i < num_components; i++)
 657          components[i] = spirv_builder_const_float(&ctx->builder, bit_size,
 658                                                    values[i]);
 659
 660       SpvId type = get_fvec_type(ctx, bit_size, num_components);
 661       return spirv_builder_const_composite(&ctx->builder, type, components,
 662                                            num_components);
 663    }
 664
 665    assert(num_components == 1);
 666    return spirv_builder_const_float(&ctx->builder, bit_size, values[0]);
 667 }
 668
 669 static SpvId
 670 get_uvec_constant(struct ntv_context *ctx, int bit_size, int num_components,
 671                   const uint32_t values[])
 672 {
 673    assert(bit_size == 32);
 674
 675    if (num_components > 1) {
 676       SpvId components[num_components];
 677       for (int i = 0; i < num_components; i++)
 678          components[i] = spirv_builder_const_uint(&ctx->builder, bit_size,
 679                                                   values[i]);
 680
 681       SpvId type = get_uvec_type(ctx, bit_size, num_components);
 682       return spirv_builder_const_composite(&ctx->builder, type, components,
 683                                            num_components);
 684    }
 685
 686    assert(num_components == 1);
 687    return spirv_builder_const_uint(&ctx->builder, bit_size, values[0]);
 688 }
 689
 690 static inline unsigned
 691 alu_instr_src_components(const nir_alu_instr *instr, unsigned src)
 692 {
 693    if (nir_op_infos[instr->op].input_sizes[src] > 0)
 694       return nir_op_infos[instr->op].input_sizes[src];
 695
 696    if (instr->dest.dest.is_ssa)
 697       return instr->dest.dest.ssa.num_components;
 698    else
 699       return instr->dest.dest.reg.reg->num_components;
 700 }
 701
 702 static SpvId
 703 get_alu_src(struct ntv_context *ctx, nir_alu_instr *alu, unsigned src)
 704 {
 705    SpvId uint_value = get_alu_src_uint(ctx, alu, src);
 706
 707    unsigned num_components = alu_instr_src_components(alu, src);
 708    unsigned bit_size = nir_src_bit_size(alu->src[src].src);
 709    nir_alu_type type = nir_op_infos[alu->op].input_types[src];
 710
 711    switch (nir_alu_type_get_base_type(type)) {
 712    case nir_type_bool:
 713       assert(bit_size == 1);
 714       return uvec_to_bvec(ctx, uint_value, num_components);
 715
 716    case nir_type_int:
 717       return bitcast_to_ivec(ctx, uint_value, bit_size, num_components);
 718
 719    case nir_type_uint:
 720       return uint_value;
 721
 722    case nir_type_float:
 723       return bitcast_to_fvec(ctx, uint_value, bit_size, num_components);
 724
 725    default:
 726       unreachable("unknown nir_alu_type");
 727    }
 728 }
 729
 730 static void
 731 store_alu_result(struct ntv_context *ctx, nir_alu_instr *alu, SpvId result)
 732 {
 733    assert(!alu->dest.saturate);
 734    return store_dest(ctx, &alu->dest.dest, result, nir_op_infos[alu->op].output_type);
 735 }
 736
 737 static SpvId
 738 get_dest_type(struct ntv_context *ctx, nir_dest *dest, nir_alu_type type)
 739 {
 740    unsigned num_components = nir_dest_num_components(*dest);
 741    unsigned bit_size = nir_dest_bit_size(*dest);
 742
 743    switch (nir_alu_type_get_base_type(type)) {
 744    case nir_type_bool:
 745       return get_bvec_type(ctx, num_components);
 746
 747    case nir_type_int:
 748       return get_ivec_type(ctx, bit_size, num_components);
 749
 750    case nir_type_uint:
 751       return get_uvec_type(ctx, bit_size, num_components);
 752
 753    case nir_type_float:
 754       return get_fvec_type(ctx, bit_size, num_components);
 755
 756    default:
 757       unreachable("unsupported nir_alu_type");
 758    }
 759 }
 760
 761 static void
 762 emit_alu(struct ntv_context *ctx, nir_alu_instr *alu)
 763 {
 764    SpvId src[nir_op_infos[alu->op].num_inputs];
 765    for (unsigned i = 0; i < nir_op_infos[alu->op].num_inputs; i++)
 766       src[i] = get_alu_src(ctx, alu, i);
 767
 768    SpvId dest_type = get_dest_type(ctx, &alu->dest.dest,
 769                                    nir_op_infos[alu->op].output_type);
 770    unsigned bit_size = nir_dest_bit_size(alu->dest.dest);
 771    unsigned num_components = nir_dest_num_components(alu->dest.dest);
 772
 773    SpvId result = 0;
 774    switch (alu->op) {
 775    case nir_op_mov:
 776       assert(nir_op_infos[alu->op].num_inputs == 1);
 777       result = src[0];
 778       break;
 779
 780 #define UNOP(nir_op, spirv_op) \
 781    case nir_op: \
 782       assert(nir_op_infos[alu->op].num_inputs == 1); \
 783       result = emit_unop(ctx, spirv_op, dest_type, src[0]); \
 784       break;
 785
 786    UNOP(nir_op_fneg, SpvOpFNegate)
 787    UNOP(nir_op_fddx, SpvOpDPdx)
 788    UNOP(nir_op_fddy, SpvOpDPdy)
 789 #undef UNOP
 790
 791 #define BUILTIN_UNOP(nir_op, spirv_op) \
 792    case nir_op: \
 793       assert(nir_op_infos[alu->op].num_inputs == 1); \
 794       result = emit_builtin_unop(ctx, spirv_op, dest_type, src[0]); \
 795       break;
 796
 797    BUILTIN_UNOP(nir_op_fabs, GLSLstd450FAbs)
 798    BUILTIN_UNOP(nir_op_fsqrt, GLSLstd450Sqrt)
 799    BUILTIN_UNOP(nir_op_frsq, GLSLstd450InverseSqrt)
 800    BUILTIN_UNOP(nir_op_flog2, GLSLstd450Log2)
 801    BUILTIN_UNOP(nir_op_fexp2, GLSLstd450Exp2)
 802    BUILTIN_UNOP(nir_op_ffract, GLSLstd450Fract)
 803    BUILTIN_UNOP(nir_op_ffloor, GLSLstd450Floor)
 804    BUILTIN_UNOP(nir_op_fceil, GLSLstd450Ceil)
 805    BUILTIN_UNOP(nir_op_ftrunc, GLSLstd450Trunc)
 806    BUILTIN_UNOP(nir_op_fround_even, GLSLstd450RoundEven)
 807    BUILTIN_UNOP(nir_op_fsign, GLSLstd450FSign)
 808    BUILTIN_UNOP(nir_op_fsin, GLSLstd450Sin)
 809    BUILTIN_UNOP(nir_op_fcos, GLSLstd450Cos)
 810 #undef BUILTIN_UNOP
 811
 812    case nir_op_frcp: {
 813       assert(nir_op_infos[alu->op].num_inputs == 1);
 814       float one[4] = { 1, 1, 1, 1 };
 815       src[1] = src[0];
 816       src[0] = get_fvec_constant(ctx, bit_size, num_components, one);
 817       result = emit_binop(ctx, SpvOpFDiv, dest_type, src[0], src[1]);
 818       }
 819       break;
 820
 821 #define BINOP(nir_op, spirv_op) \
 822    case nir_op: \
 823       assert(nir_op_infos[alu->op].num_inputs == 2); \
 824       result = emit_binop(ctx, spirv_op, dest_type, src[0], src[1]); \
 825       break;
 826
 827    BINOP(nir_op_iadd, SpvOpIAdd)
 828    BINOP(nir_op_isub, SpvOpISub)
 829    BINOP(nir_op_imul, SpvOpIMul)
 830    BINOP(nir_op_fadd, SpvOpFAdd)
 831    BINOP(nir_op_fsub, SpvOpFSub)
 832    BINOP(nir_op_fmul, SpvOpFMul)
 833    BINOP(nir_op_fmod, SpvOpFMod)
 834    BINOP(nir_op_flt, SpvOpFUnordLessThan)
 835    BINOP(nir_op_fge, SpvOpFUnordGreaterThanEqual)
 836 #undef BINOP
 837
 838 #define BUILTIN_BINOP(nir_op, spirv_op) \
 839    case nir_op: \
 840       assert(nir_op_infos[alu->op].num_inputs == 2); \
 841       result = emit_builtin_binop(ctx, spirv_op, dest_type, src[0], src[1]); \
 842       break;
 843
 844    BUILTIN_BINOP(nir_op_fmin, GLSLstd450FMin)
 845    BUILTIN_BINOP(nir_op_fmax, GLSLstd450FMax)
 846 #undef BUILTIN_BINOP
 847
 848    case nir_op_fdot2:
 849    case nir_op_fdot3:
 850    case nir_op_fdot4:
 851       assert(nir_op_infos[alu->op].num_inputs == 2);
 852       result = emit_binop(ctx, SpvOpDot, dest_type, src[0], src[1]);
 853       break;
 854
 855    case nir_op_seq:
 856    case nir_op_sne:
 857    case nir_op_slt:
 858    case nir_op_sge: {
 859       assert(nir_op_infos[alu->op].num_inputs == 2);
 860       int num_components = nir_dest_num_components(alu->dest.dest);
 861       SpvId bool_type = get_bvec_type(ctx, num_components);
 862
 863       SpvId zero = spirv_builder_const_float(&ctx->builder, 32, 0.0f);
 864       SpvId one = spirv_builder_const_float(&ctx->builder, 32, 1.0f);
 865       if (num_components > 1) {
 866          SpvId zero_comps[num_components], one_comps[num_components];
 867          for (int i = 0; i < num_components; i++) {
 868             zero_comps[i] = zero;
 869             one_comps[i] = one;
 870          }
 871
 872          zero = spirv_builder_const_composite(&ctx->builder, dest_type,
 873                                               zero_comps, num_components);
 874          one = spirv_builder_const_composite(&ctx->builder, dest_type,
 875                                              one_comps, num_components);
 876       }
 877
 878       SpvOp op;
 879       switch (alu->op) {
 880       case nir_op_seq: op = SpvOpFOrdEqual; break;
 881       case nir_op_sne: op = SpvOpFOrdNotEqual; break;
 882       case nir_op_slt: op = SpvOpFOrdLessThan; break;
 883       case nir_op_sge: op = SpvOpFOrdGreaterThanEqual; break;
 884       default: unreachable("unexpected op");
 885       }
 886
 887       result = emit_binop(ctx, op, bool_type, src[0], src[1]);
 888       result = emit_triop(ctx, SpvOpSelect, dest_type, result, one, zero);
 889       }
 890       break;
 891
 892    case nir_op_fcsel: {
 893       assert(nir_op_infos[alu->op].num_inputs == 3);
 894       int num_components = nir_dest_num_components(alu->dest.dest);
 895       SpvId bool_type = get_bvec_type(ctx, num_components);
 896
 897       float zero[4] = { 0, 0, 0, 0 };
 898       SpvId cmp = get_fvec_constant(ctx, nir_src_bit_size(alu->src[0].src),
 899                                          num_components, zero);
 900
 901       result = emit_binop(ctx, SpvOpFOrdGreaterThan, bool_type, src[0], cmp);
 902       result = emit_triop(ctx, SpvOpSelect, dest_type, result, src[1], src[2]);
 903       }
 904       break;
 905
 906    case nir_op_vec2:
 907    case nir_op_vec3:
 908    case nir_op_vec4: {
 909       int num_inputs = nir_op_infos[alu->op].num_inputs;
 910       assert(2 <= num_inputs && num_inputs <= 4);
 911       result = spirv_builder_emit_composite_construct(&ctx->builder, dest_type,
 912                                                       src, num_inputs);
 913    }
 914    break;
 915
 916    default:
 917       fprintf(stderr, "emit_alu: not implemented (%s)\n",
 918               nir_op_infos[alu->op].name);
 919
 920       unreachable("unsupported opcode");
 921       return;
 922    }
 923
 924    store_alu_result(ctx, alu, result);
 925 }
 926
 927 static void
 928 emit_load_const(struct ntv_context *ctx, nir_load_const_instr *load_const)
 929 {
 930    uint32_t values[NIR_MAX_VEC_COMPONENTS];
 931    for (int i = 0; i < load_const->def.num_components; ++i)
 932       values[i] = load_const->value[i].u32;
 933
 934    SpvId constant = get_uvec_constant(ctx, load_const->def.bit_size,
 935                                            load_const->def.num_components,
 936                                            values);
 937    store_ssa_def_uint(ctx, &load_const->def, constant);
 938 }
 939
 940 static void
 941 emit_load_ubo(struct ntv_context *ctx, nir_intrinsic_instr *intr)
 942 {
 943    nir_const_value *const_block_index = nir_src_as_const_value(intr->src[0]);
 944    assert(const_block_index); // no dynamic indexing for now
 945    assert(const_block_index->u32 == 0); // we only support the default UBO for now
 946
 947    nir_const_value *const_offset = nir_src_as_const_value(intr->src[1]);
 948    if (const_offset) {
 949       SpvId uvec4_type = get_uvec_type(ctx, 32, 4);
 950       SpvId pointer_type = spirv_builder_type_pointer(&ctx->builder,
 951                                                       SpvStorageClassUniform,
 952                                                       uvec4_type);
 953
 954       unsigned idx = const_offset->u32;
 955       SpvId member = spirv_builder_const_uint(&ctx->builder, 32, 0);
 956       SpvId offset = spirv_builder_const_uint(&ctx->builder, 32, idx);
 957       SpvId offsets[] = { member, offset };
 958       SpvId ptr = spirv_builder_emit_access_chain(&ctx->builder, pointer_type,
 959                                                   ctx->ubos[0], offsets,
 960                                                   ARRAY_SIZE(offsets));
 961       SpvId result = spirv_builder_emit_load(&ctx->builder, uvec4_type, ptr);
 962
 963       SpvId type = get_dest_uvec_type(ctx, &intr->dest);
 964       unsigned num_components = nir_dest_num_components(intr->dest);
 965       if (num_components == 1) {
 966          uint32_t components[] = { 0 };
 967          result = spirv_builder_emit_composite_extract(&ctx->builder,
 968                                                        type,
 969                                                        result, components,
 970                                                        1);
 971       } else if (num_components < 4) {
 972          SpvId constituents[num_components];
 973          SpvId uint_type = spirv_builder_type_uint(&ctx->builder, 32);
 974          for (uint32_t i = 0; i < num_components; ++i)
 975             constituents[i] = spirv_builder_emit_composite_extract(&ctx->builder,
 976                                                                    uint_type,
 977                                                                    result, &i,
 978                                                                    1);
 979
 980          result = spirv_builder_emit_composite_construct(&ctx->builder,
 981                                                          type,
 982                                                          constituents,
 983                                                          num_components);
 984       }
 985
 986       store_dest_uint(ctx, &intr->dest, result);
 987    } else
 988       unreachable("uniform-addressing not yet supported");
 989 }
 990
 991 static void
 992 emit_discard(struct ntv_context *ctx, nir_intrinsic_instr *intr)
 993 {
 994    assert(ctx->block_started);
 995    spirv_builder_emit_kill(&ctx->builder);
 996    /* discard is weird in NIR, so let's just create an unreachable block after
 997       it and hope that the vulkan driver will DCE any instructinos in it. */
 998    spirv_builder_label(&ctx->builder, spirv_builder_new_id(&ctx->builder));
 999 }
1000
1001 static void
1002 emit_load_deref(struct ntv_context *ctx, nir_intrinsic_instr *intr)
1003 {
1004    /* uint is a bit of a lie here; it's really just a pointer */
1005    SpvId ptr = get_src_uint(ctx, intr->src);
1006
1007    nir_variable *var = nir_intrinsic_get_var(intr, 0);
1008    SpvId result = spirv_builder_emit_load(&ctx->builder,
1009                                           get_glsl_type(ctx, var->type),
1010                                           ptr);
1011    unsigned num_components = nir_dest_num_components(intr->dest);
1012    unsigned bit_size = nir_dest_bit_size(intr->dest);
1013    result = bitcast_to_uvec(ctx, result, bit_size, num_components);
1014    store_dest_uint(ctx, &intr->dest, result);
1015 }
1016
1017 static void
1018 emit_store_deref(struct ntv_context *ctx, nir_intrinsic_instr *intr)
1019 {
1020    /* uint is a bit of a lie here; it's really just a pointer */
1021    SpvId ptr = get_src_uint(ctx, &intr->src[0]);
1022    SpvId src = get_src_uint(ctx, &intr->src[1]);
1023
1024    nir_variable *var = nir_intrinsic_get_var(intr, 0);
1025    SpvId result = emit_unop(ctx, SpvOpBitcast,
1026                             get_glsl_type(ctx, glsl_without_array(var->type)),
1027                             src);
1028    spirv_builder_emit_store(&ctx->builder, ptr, result);
1029 }
1030
1031 static void
1032 emit_intrinsic(struct ntv_context *ctx, nir_intrinsic_instr *intr)
1033 {
1034    switch (intr->intrinsic) {
1035    case nir_intrinsic_load_ubo:
1036       emit_load_ubo(ctx, intr);
1037       break;
1038
1039    case nir_intrinsic_discard:
1040       emit_discard(ctx, intr);
1041       break;
1042
1043    case nir_intrinsic_load_deref:
1044       emit_load_deref(ctx, intr);
1045       break;
1046
1047    case nir_intrinsic_store_deref:
1048       emit_store_deref(ctx, intr);
1049       break;
1050
1051    default:
1052       fprintf(stderr, "emit_intrinsic: not implemented (%s)\n",
1053               nir_intrinsic_infos[intr->intrinsic].name);
1054       unreachable("unsupported intrinsic");
1055    }
1056 }
1057
1058 static void
1059 emit_undef(struct ntv_context *ctx, nir_ssa_undef_instr *undef)
1060 {
1061    SpvId type = get_uvec_type(ctx, undef->def.bit_size,
1062                               undef->def.num_components);
1063
1064    store_ssa_def_uint(ctx, &undef->def,
1065                       spirv_builder_emit_undef(&ctx->builder, type));
1066 }
1067
1068 static SpvId
1069 get_src_float(struct ntv_context *ctx, nir_src *src)
1070 {
1071    SpvId def = get_src_uint(ctx, src);
1072    unsigned num_components = nir_src_num_components(*src);
1073    unsigned bit_size = nir_src_bit_size(*src);
1074    return bitcast_to_fvec(ctx, def, bit_size, num_components);
1075 }
1076
1077 static void
1078 emit_tex(struct ntv_context *ctx, nir_tex_instr *tex)
1079 {
1080    assert(tex->op == nir_texop_tex);
1081    assert(nir_alu_type_get_base_type(tex->dest_type) == nir_type_float);
1082    assert(tex->texture_index == tex->sampler_index);
1083
1084    bool has_proj = false, has_lod = false;
1085    SpvId coord = 0, proj, lod;
1086    unsigned coord_components;
1087    for (unsigned i = 0; i < tex->num_srcs; i++) {
1088       switch (tex->src[i].src_type) {
1089       case nir_tex_src_coord:
1090          coord = get_src_float(ctx, &tex->src[i].src);
1091          coord_components = nir_src_num_components(tex->src[i].src);
1092          break;
1093
1094       case nir_tex_src_projector:
1095          has_proj = true;
1096          proj = get_src_float(ctx, &tex->src[i].src);
1097          assert(nir_src_num_components(tex->src[i].src) == 1);
1098          break;
1099
1100       case nir_tex_src_lod:
1101          has_lod = true;
1102          lod = get_src_float(ctx, &tex->src[i].src);
1103          assert(nir_src_num_components(tex->src[i].src) == 1);
1104          break;
1105
1106       default:
1107          fprintf(stderr, "texture source: %d\n", tex->src[i].src_type);
1108          unreachable("unknown texture source");
1109       }
1110    }
1111
1112    if (!has_lod && ctx->stage != MESA_SHADER_FRAGMENT) {
1113       has_lod = true;
1114       lod = spirv_builder_const_float(&ctx->builder, 32, 0);
1115    }
1116
1117    bool is_ms;
1118    SpvDim dimension = type_to_dim(tex->sampler_dim, &is_ms);
1119    SpvId float_type = spirv_builder_type_float(&ctx->builder, 32);
1120    SpvId image_type = spirv_builder_type_image(&ctx->builder, float_type,
1121                             dimension, false, tex->is_array, is_ms, 1,
1122                             SpvImageFormatUnknown);
1123    SpvId sampled_type = spirv_builder_type_sampled_image(&ctx->builder,
1124                                                          image_type);
1125
1126    assert(tex->texture_index < ctx->num_samplers);
1127    SpvId load = spirv_builder_emit_load(&ctx->builder, sampled_type,
1128                                         ctx->samplers[tex->texture_index]);
1129
1130    SpvId dest_type = get_dest_type(ctx, &tex->dest, tex->dest_type);
1131
1132    SpvId result;
1133    if (has_proj) {
1134       SpvId constituents[coord_components + 1];
1135       SpvId float_type = spirv_builder_type_float(&ctx->builder, 32);
1136       for (uint32_t i = 0; i < coord_components; ++i)
1137          constituents[i] = spirv_builder_emit_composite_extract(&ctx->builder,
1138                                               float_type,
1139                                               coord,
1140                                               &i, 1);
1141
1142       constituents[coord_components++] = proj;
1143
1144       SpvId vec_type = get_fvec_type(ctx, 32, coord_components);
1145       SpvId merged = spirv_builder_emit_composite_construct(&ctx->builder,
1146                                                             vec_type,
1147                                                             constituents,
1148                                                             coord_components);
1149
1150       if (has_lod)
1151          result = spirv_builder_emit_image_sample_proj_explicit_lod(&ctx->builder,
1152                                                                     dest_type,
1153                                                                     load,
1154                                                                     merged,
1155                                                                     lod);
1156       else
1157          result = spirv_builder_emit_image_sample_proj_implicit_lod(&ctx->builder,
1158                                                                     dest_type,
1159                                                                     load,
1160                                                                     merged);
1161    } else {
1162       if (has_lod)
1163          result = spirv_builder_emit_image_sample_explicit_lod(&ctx->builder,
1164                                                                dest_type,
1165                                                                load,
1166                                                                coord, lod);
1167       else
1168          result = spirv_builder_emit_image_sample_implicit_lod(&ctx->builder,
1169                                                                dest_type,
1170                                                                load,
1171                                                                coord);
1172    }
1173    spirv_builder_emit_decoration(&ctx->builder, result,
1174                                  SpvDecorationRelaxedPrecision);
1175
1176    store_dest(ctx, &tex->dest, result, tex->dest_type);
1177 }
1178
1179 static void
1180 start_block(struct ntv_context *ctx, SpvId label)
1181 {
1182    /* terminate previous block if needed */
1183    if (ctx->block_started)
1184       spirv_builder_emit_branch(&ctx->builder, label);
1185
1186    /* start new block */
1187    spirv_builder_label(&ctx->builder, label);
1188    ctx->block_started = true;
1189 }
1190
1191 static void
1192 branch(struct ntv_context *ctx, SpvId label)
1193 {
1194    assert(ctx->block_started);
1195    spirv_builder_emit_branch(&ctx->builder, label);
1196    ctx->block_started = false;
1197 }
1198
1199 static void
1200 branch_conditional(struct ntv_context *ctx, SpvId condition, SpvId then_id,
1201                    SpvId else_id)
1202 {
1203    assert(ctx->block_started);
1204    spirv_builder_emit_branch_conditional(&ctx->builder, condition,
1205                                          then_id, else_id);
1206    ctx->block_started = false;
1207 }
1208
1209 static void
1210 emit_jump(struct ntv_context *ctx, nir_jump_instr *jump)
1211 {
1212    switch (jump->type) {
1213    case nir_jump_break:
1214       assert(ctx->loop_break);
1215       branch(ctx, ctx->loop_break);
1216       break;
1217
1218    case nir_jump_continue:
1219       assert(ctx->loop_cont);
1220       branch(ctx, ctx->loop_cont);
1221       break;
1222
1223    default:
1224       unreachable("Unsupported jump type\n");
1225    }
1226 }
1227
1228 static void
1229 emit_deref_var(struct ntv_context *ctx, nir_deref_instr *deref)
1230 {
1231    assert(deref->deref_type == nir_deref_type_var);
1232
1233    struct hash_entry *he = _mesa_hash_table_search(ctx->vars, deref->var);
1234    assert(he);
1235    SpvId result = (SpvId)(intptr_t)he->data;
1236    /* uint is a bit of a lie here, it's really just an opaque type */
1237    store_dest_uint(ctx, &deref->dest, result);
1238 }
1239
1240 static void
1241 emit_deref_array(struct ntv_context *ctx, nir_deref_instr *deref)
1242 {
1243    assert(deref->deref_type == nir_deref_type_array);
1244    nir_variable *var = nir_deref_instr_get_variable(deref);
1245
1246    SpvStorageClass storage_class;
1247    switch (var->data.mode) {
1248    case nir_var_shader_in:
1249       storage_class = SpvStorageClassInput;
1250       break;
1251
1252    case nir_var_shader_out:
1253       storage_class = SpvStorageClassOutput;
1254       break;
1255
1256    default:
1257       unreachable("Unsupported nir_variable_mode\n");
1258    }
1259
1260    SpvId index = get_src_uint(ctx, &deref->arr.index);
1261
1262    SpvId ptr_type = spirv_builder_type_pointer(&ctx->builder,
1263                                                storage_class,
1264                                                get_glsl_type(ctx, deref->type));
1265
1266    SpvId result = spirv_builder_emit_access_chain(&ctx->builder,
1267                                                   ptr_type,
1268                                                   get_src_uint(ctx, &deref->parent),
1269                                                   &index, 1);
1270    /* uint is a bit of a lie here, it's really just an opaque type */
1271    store_dest_uint(ctx, &deref->dest, result);
1272 }
1273
1274 static void
1275 emit_deref(struct ntv_context *ctx, nir_deref_instr *deref)
1276 {
1277    switch (deref->deref_type) {
1278    case nir_deref_type_var:
1279       emit_deref_var(ctx, deref);
1280       break;
1281
1282    case nir_deref_type_array:
1283       emit_deref_array(ctx, deref);
1284       break;
1285
1286    default:
1287       unreachable("unexpected deref_type");
1288    }
1289 }
1290
1291 static void
1292 emit_block(struct ntv_context *ctx, struct nir_block *block)
1293 {
1294    start_block(ctx, block_label(ctx, block));
1295    nir_foreach_instr(instr, block) {
1296       switch (instr->type) {
1297       case nir_instr_type_alu:
1298          emit_alu(ctx, nir_instr_as_alu(instr));
1299          break;
1300       case nir_instr_type_intrinsic:
1301          emit_intrinsic(ctx, nir_instr_as_intrinsic(instr));
1302          break;
1303       case nir_instr_type_load_const:
1304          emit_load_const(ctx, nir_instr_as_load_const(instr));
1305          break;
1306       case nir_instr_type_ssa_undef:
1307          emit_undef(ctx, nir_instr_as_ssa_undef(instr));
1308          break;
1309       case nir_instr_type_tex:
1310          emit_tex(ctx, nir_instr_as_tex(instr));
1311          break;
1312       case nir_instr_type_phi:
1313          unreachable("nir_instr_type_phi not supported");
1314          break;
1315       case nir_instr_type_jump:
1316          emit_jump(ctx, nir_instr_as_jump(instr));
1317          break;
1318       case nir_instr_type_call:
1319          unreachable("nir_instr_type_call not supported");
1320          break;
1321       case nir_instr_type_parallel_copy:
1322          unreachable("nir_instr_type_parallel_copy not supported");
1323          break;
1324       case nir_instr_type_deref:
1325          emit_deref(ctx, nir_instr_as_deref(instr));
1326          break;
1327       }
1328    }
1329 }
1330
1331 static void
1332 emit_cf_list(struct ntv_context *ctx, struct exec_list *list);
1333
1334 static SpvId
1335 get_src_bool(struct ntv_context *ctx, nir_src *src)
1336 {
1337    SpvId def = get_src_uint(ctx, src);
1338    assert(nir_src_bit_size(*src) == 32);
1339    unsigned num_components = nir_src_num_components(*src);
1340    return uvec_to_bvec(ctx, def, num_components);
1341 }
1342
1343 static void
1344 emit_if(struct ntv_context *ctx, nir_if *if_stmt)
1345 {
1346    SpvId condition = get_src_bool(ctx, &if_stmt->condition);
1347
1348    SpvId header_id = spirv_builder_new_id(&ctx->builder);
1349    SpvId then_id = block_label(ctx, nir_if_first_then_block(if_stmt));
1350    SpvId endif_id = spirv_builder_new_id(&ctx->builder);
1351    SpvId else_id = endif_id;
1352
1353    bool has_else = !exec_list_is_empty(&if_stmt->else_list);
1354    if (has_else) {
1355       assert(nir_if_first_else_block(if_stmt)->index < ctx->num_blocks);
1356       else_id = block_label(ctx, nir_if_first_else_block(if_stmt));
1357    }
1358
1359    /* create a header-block */
1360    start_block(ctx, header_id);
1361    spirv_builder_emit_selection_merge(&ctx->builder, endif_id,
1362                                       SpvSelectionControlMaskNone);
1363    branch_conditional(ctx, condition, then_id, else_id);
1364
1365    emit_cf_list(ctx, &if_stmt->then_list);
1366
1367    if (has_else) {
1368       if (ctx->block_started)
1369          branch(ctx, endif_id);
1370
1371       emit_cf_list(ctx, &if_stmt->else_list);
1372    }
1373
1374    start_block(ctx, endif_id);
1375 }
1376
1377 static void
1378 emit_loop(struct ntv_context *ctx, nir_loop *loop)
1379 {
1380    SpvId header_id = spirv_builder_new_id(&ctx->builder);
1381    SpvId begin_id = block_label(ctx, nir_loop_first_block(loop));
1382    SpvId break_id = spirv_builder_new_id(&ctx->builder);
1383    SpvId cont_id = spirv_builder_new_id(&ctx->builder);
1384
1385    /* create a header-block */
1386    start_block(ctx, header_id);
1387    spirv_builder_loop_merge(&ctx->builder, break_id, cont_id, SpvLoopControlMaskNone);
1388    branch(ctx, begin_id);
1389
1390    SpvId save_break = ctx->loop_break;
1391    SpvId save_cont = ctx->loop_cont;
1392    ctx->loop_break = break_id;
1393    ctx->loop_cont = cont_id;
1394
1395    emit_cf_list(ctx, &loop->body);
1396
1397    ctx->loop_break = save_break;
1398    ctx->loop_cont = save_cont;
1399
1400    branch(ctx, cont_id);
1401    start_block(ctx, cont_id);
1402    branch(ctx, header_id);
1403
1404    start_block(ctx, break_id);
1405 }
1406
1407 static void
1408 emit_cf_list(struct ntv_context *ctx, struct exec_list *list)
1409 {
1410    foreach_list_typed(nir_cf_node, node, node, list) {
1411       switch (node->type) {
1412       case nir_cf_node_block:
1413          emit_block(ctx, nir_cf_node_as_block(node));
1414          break;
1415
1416       case nir_cf_node_if:
1417          emit_if(ctx, nir_cf_node_as_if(node));
1418          break;
1419
1420       case nir_cf_node_loop:
1421          emit_loop(ctx, nir_cf_node_as_loop(node));
1422          break;
1423
1424       case nir_cf_node_function:
1425          unreachable("nir_cf_node_function not supported");
1426          break;
1427       }
1428    }
1429 }
1430
1431 struct spirv_shader *
1432 nir_to_spirv(struct nir_shader *s)
1433 {
1434    struct spirv_shader *ret = NULL;
1435
1436    struct ntv_context ctx = {};
1437
1438    switch (s->info.stage) {
1439    case MESA_SHADER_VERTEX:
1440    case MESA_SHADER_FRAGMENT:
1441    case MESA_SHADER_COMPUTE:
1442       spirv_builder_emit_cap(&ctx.builder, SpvCapabilityShader);
1443       break;
1444
1445    case MESA_SHADER_TESS_CTRL:
1446    case MESA_SHADER_TESS_EVAL:
1447       spirv_builder_emit_cap(&ctx.builder, SpvCapabilityTessellation);
1448       break;
1449
1450    case MESA_SHADER_GEOMETRY:
1451       spirv_builder_emit_cap(&ctx.builder, SpvCapabilityGeometry);
1452       break;
1453
1454    default:
1455       unreachable("invalid stage");
1456    }
1457
1458    ctx.stage = s->info.stage;
1459    ctx.GLSL_std_450 = spirv_builder_import(&ctx.builder, "GLSL.std.450");
1460    spirv_builder_emit_source(&ctx.builder, SpvSourceLanguageGLSL, 450);
1461
1462    spirv_builder_emit_mem_model(&ctx.builder, SpvAddressingModelLogical,
1463                                 SpvMemoryModelGLSL450);
1464
1465    SpvExecutionModel exec_model;
1466    switch (s->info.stage) {
1467    case MESA_SHADER_VERTEX:
1468       exec_model = SpvExecutionModelVertex;
1469       break;
1470    case MESA_SHADER_TESS_CTRL:
1471       exec_model = SpvExecutionModelTessellationControl;
1472       break;
1473    case MESA_SHADER_TESS_EVAL:
1474       exec_model = SpvExecutionModelTessellationEvaluation;
1475       break;
1476    case MESA_SHADER_GEOMETRY:
1477       exec_model = SpvExecutionModelGeometry;
1478       break;
1479    case MESA_SHADER_FRAGMENT:
1480       exec_model = SpvExecutionModelFragment;
1481       break;
1482    case MESA_SHADER_COMPUTE:
1483       exec_model = SpvExecutionModelGLCompute;
1484       break;
1485    default:
1486       unreachable("invalid stage");
1487    }
1488
1489    SpvId type_void = spirv_builder_type_void(&ctx.builder);
1490    SpvId type_main = spirv_builder_type_function(&ctx.builder, type_void,
1491                                                  NULL, 0);
1492    SpvId entry_point = spirv_builder_new_id(&ctx.builder);
1493    spirv_builder_emit_name(&ctx.builder, entry_point, "main");
1494
1495    ctx.vars = _mesa_hash_table_create(NULL, _mesa_hash_pointer,
1496                                       _mesa_key_pointer_equal);
1497
1498    nir_foreach_variable(var, &s->inputs)
1499       emit_input(&ctx, var);
1500
1501    nir_foreach_variable(var, &s->outputs)
1502       emit_output(&ctx, var);
1503
1504    nir_foreach_variable(var, &s->uniforms)
1505       emit_uniform(&ctx, var);
1506
1507    spirv_builder_emit_entry_point(&ctx.builder, exec_model, entry_point,
1508                                   "main", ctx.entry_ifaces,
1509                                   ctx.num_entry_ifaces);
1510    if (s->info.stage == MESA_SHADER_FRAGMENT)
1511       spirv_builder_emit_exec_mode(&ctx.builder, entry_point,
1512                                    SpvExecutionModeOriginUpperLeft);
1513
1514
1515    spirv_builder_function(&ctx.builder, entry_point, type_void,
1516                                             SpvFunctionControlMaskNone,
1517                                             type_main);
1518
1519    nir_function_impl *entry = nir_shader_get_entrypoint(s);
1520    nir_metadata_require(entry, nir_metadata_block_index);
1521
1522    ctx.defs = (SpvId *)malloc(sizeof(SpvId) * entry->ssa_alloc);
1523    if (!ctx.defs)
1524       goto fail;
1525    ctx.num_defs = entry->ssa_alloc;
1526
1527    nir_index_local_regs(entry);
1528    ctx.regs = malloc(sizeof(SpvId) * entry->reg_alloc);
1529    if (!ctx.regs)
1530       goto fail;
1531    ctx.num_regs = entry->reg_alloc;
1532
1533    SpvId *block_ids = (SpvId *)malloc(sizeof(SpvId) * entry->num_blocks);
1534    if (!block_ids)
1535       goto fail;
1536
1537    for (int i = 0; i < entry->num_blocks; ++i)
1538       block_ids[i] = spirv_builder_new_id(&ctx.builder);
1539
1540    ctx.block_ids = block_ids;
1541    ctx.num_blocks = entry->num_blocks;
1542
1543    /* emit a block only for the variable declarations */
1544    start_block(&ctx, spirv_builder_new_id(&ctx.builder));
1545    foreach_list_typed(nir_register, reg, node, &entry->registers) {
1546       SpvId type = get_uvec_type(&ctx, reg->bit_size, reg->num_components);
1547       SpvId pointer_type = spirv_builder_type_pointer(&ctx.builder,
1548                                                       SpvStorageClassFunction,
1549                                                       type);
1550       SpvId var = spirv_builder_emit_var(&ctx.builder, pointer_type,
1551                                          SpvStorageClassFunction);
1552
1553       ctx.regs[reg->index] = var;
1554    }
1555
1556    emit_cf_list(&ctx, &entry->body);
1557
1558    free(ctx.defs);
1559
1560    spirv_builder_return(&ctx.builder); // doesn't belong here, but whatevz
1561    spirv_builder_function_end(&ctx.builder);
1562
1563    size_t num_words = spirv_builder_get_num_words(&ctx.builder);
1564
1565    ret = CALLOC_STRUCT(spirv_shader);
1566    if (!ret)
1567       goto fail;
1568
1569    ret->words = MALLOC(sizeof(uint32_t) * num_words);
1570    if (!ret->words)
1571       goto fail;
1572
1573    ret->num_words = spirv_builder_get_words(&ctx.builder, ret->words, num_words);
1574    assert(ret->num_words == num_words);
1575
1576    return ret;
1577
1578 fail:
1579
1580    if (ret)
1581       spirv_shader_delete(ret);
1582
1583    if (ctx.vars)
1584       _mesa_hash_table_destroy(ctx.vars, NULL);
1585
1586    return NULL;
1587 }
1588
1589 void
1590 spirv_shader_delete(struct spirv_shader *s)
1591 {
1592    FREE(s->words);
1593    FREE(s);
1594 }