brw_vec4_visitor.cpp revision bb020d09c382285210a5aebe412ddabfad19e4a0
1/* 2 * Copyright © 2011 Intel Corporation 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 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * 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 NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 21 * IN THE SOFTWARE. 22 */ 23 24#include "brw_vec4.h" 25extern "C" { 26#include "main/macros.h" 27#include "program/prog_parameter.h" 28#include "program/sampler.h" 29} 30 31namespace brw { 32 33vec4_instruction::vec4_instruction(vec4_visitor *v, 34 enum opcode opcode, dst_reg dst, 35 src_reg src0, src_reg src1, src_reg src2) 36{ 37 this->opcode = opcode; 38 this->dst = dst; 39 this->src[0] = src0; 40 this->src[1] = src1; 41 this->src[2] = src2; 42 this->ir = v->base_ir; 43 this->annotation = v->current_annotation; 44} 45 46vec4_instruction * 47vec4_visitor::emit(vec4_instruction *inst) 48{ 49 this->instructions.push_tail(inst); 50 51 return inst; 52} 53 54vec4_instruction * 55vec4_visitor::emit_before(vec4_instruction *inst, vec4_instruction *new_inst) 56{ 57 new_inst->ir = inst->ir; 58 new_inst->annotation = inst->annotation; 59 60 inst->insert_before(new_inst); 61 62 return inst; 63} 64 65vec4_instruction * 66vec4_visitor::emit(enum opcode opcode, dst_reg dst, 67 src_reg src0, src_reg src1, src_reg src2) 68{ 69 return emit(new(mem_ctx) vec4_instruction(this, opcode, dst, 70 src0, src1, src2)); 71} 72 73 74vec4_instruction * 75vec4_visitor::emit(enum opcode opcode, dst_reg dst, src_reg src0, src_reg src1) 76{ 77 return emit(new(mem_ctx) vec4_instruction(this, opcode, dst, src0, src1)); 78} 79 80vec4_instruction * 81vec4_visitor::emit(enum opcode opcode, dst_reg dst, src_reg src0) 82{ 83 return emit(new(mem_ctx) vec4_instruction(this, opcode, dst, src0)); 84} 85 86vec4_instruction * 87vec4_visitor::emit(enum opcode opcode) 88{ 89 return emit(new(mem_ctx) vec4_instruction(this, opcode, dst_reg())); 90} 91 92#define ALU1(op) \ 93 vec4_instruction * \ 94 vec4_visitor::op(dst_reg dst, src_reg src0) \ 95 { \ 96 return new(mem_ctx) vec4_instruction(this, BRW_OPCODE_##op, dst, \ 97 src0); \ 98 } 99 100#define ALU2(op) \ 101 vec4_instruction * \ 102 vec4_visitor::op(dst_reg dst, src_reg src0, src_reg src1) \ 103 { \ 104 return new(mem_ctx) vec4_instruction(this, BRW_OPCODE_##op, dst, \ 105 src0, src1); \ 106 } 107 108ALU1(NOT) 109ALU1(MOV) 110ALU1(FRC) 111ALU1(RNDD) 112ALU1(RNDE) 113ALU1(RNDZ) 114ALU2(ADD) 115ALU2(MUL) 116ALU2(MACH) 117ALU2(AND) 118ALU2(OR) 119ALU2(XOR) 120ALU2(DP3) 121ALU2(DP4) 122 123/** Gen4 predicated IF. */ 124vec4_instruction * 125vec4_visitor::IF(uint32_t predicate) 126{ 127 vec4_instruction *inst; 128 129 inst = new(mem_ctx) vec4_instruction(this, BRW_OPCODE_IF); 130 inst->predicate = predicate; 131 132 return inst; 133} 134 135/** Gen6+ IF with embedded comparison. */ 136vec4_instruction * 137vec4_visitor::IF(src_reg src0, src_reg src1, uint32_t condition) 138{ 139 assert(intel->gen >= 6); 140 141 vec4_instruction *inst; 142 143 resolve_ud_negate(&src0); 144 resolve_ud_negate(&src1); 145 146 inst = new(mem_ctx) vec4_instruction(this, BRW_OPCODE_IF, dst_null_d(), 147 src0, src1); 148 inst->conditional_mod = condition; 149 150 return inst; 151} 152 153/** 154 * CMP: Sets the low bit of the destination channels with the result 155 * of the comparison, while the upper bits are undefined, and updates 156 * the flag register with the packed 16 bits of the result. 157 */ 158vec4_instruction * 159vec4_visitor::CMP(dst_reg dst, src_reg src0, src_reg src1, uint32_t condition) 160{ 161 vec4_instruction *inst; 162 163 /* original gen4 does type conversion to the destination type 164 * before before comparison, producing garbage results for floating 165 * point comparisons. 166 */ 167 if (intel->gen == 4) { 168 dst.type = src0.type; 169 if (dst.file == HW_REG) 170 dst.fixed_hw_reg.type = dst.type; 171 } 172 173 resolve_ud_negate(&src0); 174 resolve_ud_negate(&src1); 175 176 inst = new(mem_ctx) vec4_instruction(this, BRW_OPCODE_CMP, dst, src0, src1); 177 inst->conditional_mod = condition; 178 179 return inst; 180} 181 182vec4_instruction * 183vec4_visitor::SCRATCH_READ(dst_reg dst, src_reg index) 184{ 185 vec4_instruction *inst; 186 187 inst = new(mem_ctx) vec4_instruction(this, VS_OPCODE_SCRATCH_READ, 188 dst, index); 189 inst->base_mrf = 14; 190 inst->mlen = 1; 191 192 return inst; 193} 194 195vec4_instruction * 196vec4_visitor::SCRATCH_WRITE(dst_reg dst, src_reg src, src_reg index) 197{ 198 vec4_instruction *inst; 199 200 inst = new(mem_ctx) vec4_instruction(this, VS_OPCODE_SCRATCH_WRITE, 201 dst, src, index); 202 inst->base_mrf = 13; 203 inst->mlen = 2; 204 205 return inst; 206} 207 208void 209vec4_visitor::emit_dp(dst_reg dst, src_reg src0, src_reg src1, unsigned elements) 210{ 211 static enum opcode dot_opcodes[] = { 212 BRW_OPCODE_DP2, BRW_OPCODE_DP3, BRW_OPCODE_DP4 213 }; 214 215 emit(dot_opcodes[elements - 2], dst, src0, src1); 216} 217 218void 219vec4_visitor::emit_math1_gen6(enum opcode opcode, dst_reg dst, src_reg src) 220{ 221 /* The gen6 math instruction ignores the source modifiers -- 222 * swizzle, abs, negate, and at least some parts of the register 223 * region description. 224 * 225 * While it would seem that this MOV could be avoided at this point 226 * in the case that the swizzle is matched up with the destination 227 * writemask, note that uniform packing and register allocation 228 * could rearrange our swizzle, so let's leave this matter up to 229 * copy propagation later. 230 */ 231 src_reg temp_src = src_reg(this, glsl_type::vec4_type); 232 emit(MOV(dst_reg(temp_src), src)); 233 234 if (dst.writemask != WRITEMASK_XYZW) { 235 /* The gen6 math instruction must be align1, so we can't do 236 * writemasks. 237 */ 238 dst_reg temp_dst = dst_reg(this, glsl_type::vec4_type); 239 240 emit(opcode, temp_dst, temp_src); 241 242 emit(MOV(dst, src_reg(temp_dst))); 243 } else { 244 emit(opcode, dst, temp_src); 245 } 246} 247 248void 249vec4_visitor::emit_math1_gen4(enum opcode opcode, dst_reg dst, src_reg src) 250{ 251 vec4_instruction *inst = emit(opcode, dst, src); 252 inst->base_mrf = 1; 253 inst->mlen = 1; 254} 255 256void 257vec4_visitor::emit_math(opcode opcode, dst_reg dst, src_reg src) 258{ 259 switch (opcode) { 260 case SHADER_OPCODE_RCP: 261 case SHADER_OPCODE_RSQ: 262 case SHADER_OPCODE_SQRT: 263 case SHADER_OPCODE_EXP2: 264 case SHADER_OPCODE_LOG2: 265 case SHADER_OPCODE_SIN: 266 case SHADER_OPCODE_COS: 267 break; 268 default: 269 assert(!"not reached: bad math opcode"); 270 return; 271 } 272 273 if (intel->gen >= 7) { 274 emit(opcode, dst, src); 275 } else if (intel->gen == 6) { 276 return emit_math1_gen6(opcode, dst, src); 277 } else { 278 return emit_math1_gen4(opcode, dst, src); 279 } 280} 281 282void 283vec4_visitor::emit_math2_gen6(enum opcode opcode, 284 dst_reg dst, src_reg src0, src_reg src1) 285{ 286 src_reg expanded; 287 288 /* The gen6 math instruction ignores the source modifiers -- 289 * swizzle, abs, negate, and at least some parts of the register 290 * region description. Move the sources to temporaries to make it 291 * generally work. 292 */ 293 294 expanded = src_reg(this, glsl_type::vec4_type); 295 expanded.type = src0.type; 296 emit(MOV(dst_reg(expanded), src0)); 297 src0 = expanded; 298 299 expanded = src_reg(this, glsl_type::vec4_type); 300 expanded.type = src1.type; 301 emit(MOV(dst_reg(expanded), src1)); 302 src1 = expanded; 303 304 if (dst.writemask != WRITEMASK_XYZW) { 305 /* The gen6 math instruction must be align1, so we can't do 306 * writemasks. 307 */ 308 dst_reg temp_dst = dst_reg(this, glsl_type::vec4_type); 309 temp_dst.type = dst.type; 310 311 emit(opcode, temp_dst, src0, src1); 312 313 emit(MOV(dst, src_reg(temp_dst))); 314 } else { 315 emit(opcode, dst, src0, src1); 316 } 317} 318 319void 320vec4_visitor::emit_math2_gen4(enum opcode opcode, 321 dst_reg dst, src_reg src0, src_reg src1) 322{ 323 vec4_instruction *inst = emit(opcode, dst, src0, src1); 324 inst->base_mrf = 1; 325 inst->mlen = 2; 326} 327 328void 329vec4_visitor::emit_math(enum opcode opcode, 330 dst_reg dst, src_reg src0, src_reg src1) 331{ 332 switch (opcode) { 333 case SHADER_OPCODE_POW: 334 case SHADER_OPCODE_INT_QUOTIENT: 335 case SHADER_OPCODE_INT_REMAINDER: 336 break; 337 default: 338 assert(!"not reached: unsupported binary math opcode"); 339 return; 340 } 341 342 if (intel->gen >= 7) { 343 emit(opcode, dst, src0, src1); 344 } else if (intel->gen == 6) { 345 return emit_math2_gen6(opcode, dst, src0, src1); 346 } else { 347 return emit_math2_gen4(opcode, dst, src0, src1); 348 } 349} 350 351void 352vec4_visitor::visit_instructions(const exec_list *list) 353{ 354 foreach_list(node, list) { 355 ir_instruction *ir = (ir_instruction *)node; 356 357 base_ir = ir; 358 ir->accept(this); 359 } 360} 361 362 363static int 364type_size(const struct glsl_type *type) 365{ 366 unsigned int i; 367 int size; 368 369 switch (type->base_type) { 370 case GLSL_TYPE_UINT: 371 case GLSL_TYPE_INT: 372 case GLSL_TYPE_FLOAT: 373 case GLSL_TYPE_BOOL: 374 if (type->is_matrix()) { 375 return type->matrix_columns; 376 } else { 377 /* Regardless of size of vector, it gets a vec4. This is bad 378 * packing for things like floats, but otherwise arrays become a 379 * mess. Hopefully a later pass over the code can pack scalars 380 * down if appropriate. 381 */ 382 return 1; 383 } 384 case GLSL_TYPE_ARRAY: 385 assert(type->length > 0); 386 return type_size(type->fields.array) * type->length; 387 case GLSL_TYPE_STRUCT: 388 size = 0; 389 for (i = 0; i < type->length; i++) { 390 size += type_size(type->fields.structure[i].type); 391 } 392 return size; 393 case GLSL_TYPE_SAMPLER: 394 /* Samplers take up one slot in UNIFORMS[], but they're baked in 395 * at link time. 396 */ 397 return 1; 398 default: 399 assert(0); 400 return 0; 401 } 402} 403 404int 405vec4_visitor::virtual_grf_alloc(int size) 406{ 407 if (virtual_grf_array_size <= virtual_grf_count) { 408 if (virtual_grf_array_size == 0) 409 virtual_grf_array_size = 16; 410 else 411 virtual_grf_array_size *= 2; 412 virtual_grf_sizes = reralloc(mem_ctx, virtual_grf_sizes, int, 413 virtual_grf_array_size); 414 virtual_grf_reg_map = reralloc(mem_ctx, virtual_grf_reg_map, int, 415 virtual_grf_array_size); 416 } 417 virtual_grf_reg_map[virtual_grf_count] = virtual_grf_reg_count; 418 virtual_grf_reg_count += size; 419 virtual_grf_sizes[virtual_grf_count] = size; 420 return virtual_grf_count++; 421} 422 423src_reg::src_reg(class vec4_visitor *v, const struct glsl_type *type) 424{ 425 init(); 426 427 this->file = GRF; 428 this->reg = v->virtual_grf_alloc(type_size(type)); 429 430 if (type->is_array() || type->is_record()) { 431 this->swizzle = BRW_SWIZZLE_NOOP; 432 } else { 433 this->swizzle = swizzle_for_size(type->vector_elements); 434 } 435 436 this->type = brw_type_for_base_type(type); 437} 438 439dst_reg::dst_reg(class vec4_visitor *v, const struct glsl_type *type) 440{ 441 init(); 442 443 this->file = GRF; 444 this->reg = v->virtual_grf_alloc(type_size(type)); 445 446 if (type->is_array() || type->is_record()) { 447 this->writemask = WRITEMASK_XYZW; 448 } else { 449 this->writemask = (1 << type->vector_elements) - 1; 450 } 451 452 this->type = brw_type_for_base_type(type); 453} 454 455/* Our support for uniforms is piggy-backed on the struct 456 * gl_fragment_program, because that's where the values actually 457 * get stored, rather than in some global gl_shader_program uniform 458 * store. 459 */ 460int 461vec4_visitor::setup_uniform_values(int loc, const glsl_type *type) 462{ 463 unsigned int offset = 0; 464 float *values = &this->vp->Base.Parameters->ParameterValues[loc][0].f; 465 466 if (type->is_matrix()) { 467 const glsl_type *column = type->column_type(); 468 469 for (unsigned int i = 0; i < type->matrix_columns; i++) { 470 offset += setup_uniform_values(loc + offset, column); 471 } 472 473 return offset; 474 } 475 476 switch (type->base_type) { 477 case GLSL_TYPE_FLOAT: 478 case GLSL_TYPE_UINT: 479 case GLSL_TYPE_INT: 480 case GLSL_TYPE_BOOL: 481 for (unsigned int i = 0; i < type->vector_elements; i++) { 482 c->prog_data.param[this->uniforms * 4 + i] = &values[i]; 483 } 484 485 /* Set up pad elements to get things aligned to a vec4 boundary. */ 486 for (unsigned int i = type->vector_elements; i < 4; i++) { 487 static float zero = 0; 488 489 c->prog_data.param[this->uniforms * 4 + i] = &zero; 490 } 491 492 /* Track the size of this uniform vector, for future packing of 493 * uniforms. 494 */ 495 this->uniform_vector_size[this->uniforms] = type->vector_elements; 496 this->uniforms++; 497 498 return 1; 499 500 case GLSL_TYPE_STRUCT: 501 for (unsigned int i = 0; i < type->length; i++) { 502 offset += setup_uniform_values(loc + offset, 503 type->fields.structure[i].type); 504 } 505 return offset; 506 507 case GLSL_TYPE_ARRAY: 508 for (unsigned int i = 0; i < type->length; i++) { 509 offset += setup_uniform_values(loc + offset, type->fields.array); 510 } 511 return offset; 512 513 case GLSL_TYPE_SAMPLER: 514 /* The sampler takes up a slot, but we don't use any values from it. */ 515 return 1; 516 517 default: 518 assert(!"not reached"); 519 return 0; 520 } 521} 522 523void 524vec4_visitor::setup_uniform_clipplane_values() 525{ 526 gl_clip_plane *clip_planes = brw_select_clip_planes(ctx); 527 528 /* Pre-Gen6, we compact clip planes. For example, if the user 529 * enables just clip planes 0, 1, and 3, we will enable clip planes 530 * 0, 1, and 2 in the hardware, and we'll move clip plane 3 to clip 531 * plane 2. This simplifies the implementation of the Gen6 clip 532 * thread. 533 * 534 * In Gen6 and later, we don't compact clip planes, because this 535 * simplifies the implementation of gl_ClipDistance. 536 */ 537 int compacted_clipplane_index = 0; 538 for (int i = 0; i < c->key.nr_userclip_plane_consts; ++i) { 539 if (intel->gen < 6 && 540 !(c->key.userclip_planes_enabled_gen_4_5 & (1 << i))) { 541 continue; 542 } 543 this->uniform_vector_size[this->uniforms] = 4; 544 this->userplane[compacted_clipplane_index] = dst_reg(UNIFORM, this->uniforms); 545 this->userplane[compacted_clipplane_index].type = BRW_REGISTER_TYPE_F; 546 for (int j = 0; j < 4; ++j) { 547 c->prog_data.param[this->uniforms * 4 + j] = &clip_planes[i][j]; 548 } 549 ++compacted_clipplane_index; 550 ++this->uniforms; 551 } 552} 553 554/* Our support for builtin uniforms is even scarier than non-builtin. 555 * It sits on top of the PROG_STATE_VAR parameters that are 556 * automatically updated from GL context state. 557 */ 558void 559vec4_visitor::setup_builtin_uniform_values(ir_variable *ir) 560{ 561 const ir_state_slot *const slots = ir->state_slots; 562 assert(ir->state_slots != NULL); 563 564 for (unsigned int i = 0; i < ir->num_state_slots; i++) { 565 /* This state reference has already been setup by ir_to_mesa, 566 * but we'll get the same index back here. We can reference 567 * ParameterValues directly, since unlike brw_fs.cpp, we never 568 * add new state references during compile. 569 */ 570 int index = _mesa_add_state_reference(this->vp->Base.Parameters, 571 (gl_state_index *)slots[i].tokens); 572 float *values = &this->vp->Base.Parameters->ParameterValues[index][0].f; 573 574 this->uniform_vector_size[this->uniforms] = 0; 575 /* Add each of the unique swizzled channels of the element. 576 * This will end up matching the size of the glsl_type of this field. 577 */ 578 int last_swiz = -1; 579 for (unsigned int j = 0; j < 4; j++) { 580 int swiz = GET_SWZ(slots[i].swizzle, j); 581 last_swiz = swiz; 582 583 c->prog_data.param[this->uniforms * 4 + j] = &values[swiz]; 584 if (swiz <= last_swiz) 585 this->uniform_vector_size[this->uniforms]++; 586 } 587 this->uniforms++; 588 } 589} 590 591dst_reg * 592vec4_visitor::variable_storage(ir_variable *var) 593{ 594 return (dst_reg *)hash_table_find(this->variable_ht, var); 595} 596 597void 598vec4_visitor::emit_bool_to_cond_code(ir_rvalue *ir, uint32_t *predicate) 599{ 600 ir_expression *expr = ir->as_expression(); 601 602 *predicate = BRW_PREDICATE_NORMAL; 603 604 if (expr) { 605 src_reg op[2]; 606 vec4_instruction *inst; 607 608 assert(expr->get_num_operands() <= 2); 609 for (unsigned int i = 0; i < expr->get_num_operands(); i++) { 610 expr->operands[i]->accept(this); 611 op[i] = this->result; 612 613 resolve_ud_negate(&op[i]); 614 } 615 616 switch (expr->operation) { 617 case ir_unop_logic_not: 618 inst = emit(AND(dst_null_d(), op[0], src_reg(1))); 619 inst->conditional_mod = BRW_CONDITIONAL_Z; 620 break; 621 622 case ir_binop_logic_xor: 623 inst = emit(XOR(dst_null_d(), op[0], op[1])); 624 inst->conditional_mod = BRW_CONDITIONAL_NZ; 625 break; 626 627 case ir_binop_logic_or: 628 inst = emit(OR(dst_null_d(), op[0], op[1])); 629 inst->conditional_mod = BRW_CONDITIONAL_NZ; 630 break; 631 632 case ir_binop_logic_and: 633 inst = emit(AND(dst_null_d(), op[0], op[1])); 634 inst->conditional_mod = BRW_CONDITIONAL_NZ; 635 break; 636 637 case ir_unop_f2b: 638 if (intel->gen >= 6) { 639 emit(CMP(dst_null_d(), op[0], src_reg(0.0f), BRW_CONDITIONAL_NZ)); 640 } else { 641 inst = emit(MOV(dst_null_f(), op[0])); 642 inst->conditional_mod = BRW_CONDITIONAL_NZ; 643 } 644 break; 645 646 case ir_unop_i2b: 647 if (intel->gen >= 6) { 648 emit(CMP(dst_null_d(), op[0], src_reg(0), BRW_CONDITIONAL_NZ)); 649 } else { 650 inst = emit(MOV(dst_null_d(), op[0])); 651 inst->conditional_mod = BRW_CONDITIONAL_NZ; 652 } 653 break; 654 655 case ir_binop_all_equal: 656 inst = emit(CMP(dst_null_d(), op[0], op[1], BRW_CONDITIONAL_Z)); 657 *predicate = BRW_PREDICATE_ALIGN16_ALL4H; 658 break; 659 660 case ir_binop_any_nequal: 661 inst = emit(CMP(dst_null_d(), op[0], op[1], BRW_CONDITIONAL_NZ)); 662 *predicate = BRW_PREDICATE_ALIGN16_ANY4H; 663 break; 664 665 case ir_unop_any: 666 inst = emit(CMP(dst_null_d(), op[0], src_reg(0), BRW_CONDITIONAL_NZ)); 667 *predicate = BRW_PREDICATE_ALIGN16_ANY4H; 668 break; 669 670 case ir_binop_greater: 671 case ir_binop_gequal: 672 case ir_binop_less: 673 case ir_binop_lequal: 674 case ir_binop_equal: 675 case ir_binop_nequal: 676 emit(CMP(dst_null_d(), op[0], op[1], 677 brw_conditional_for_comparison(expr->operation))); 678 break; 679 680 default: 681 assert(!"not reached"); 682 break; 683 } 684 return; 685 } 686 687 ir->accept(this); 688 689 resolve_ud_negate(&this->result); 690 691 if (intel->gen >= 6) { 692 vec4_instruction *inst = emit(AND(dst_null_d(), 693 this->result, src_reg(1))); 694 inst->conditional_mod = BRW_CONDITIONAL_NZ; 695 } else { 696 vec4_instruction *inst = emit(MOV(dst_null_d(), this->result)); 697 inst->conditional_mod = BRW_CONDITIONAL_NZ; 698 } 699} 700 701/** 702 * Emit a gen6 IF statement with the comparison folded into the IF 703 * instruction. 704 */ 705void 706vec4_visitor::emit_if_gen6(ir_if *ir) 707{ 708 ir_expression *expr = ir->condition->as_expression(); 709 710 if (expr) { 711 src_reg op[2]; 712 dst_reg temp; 713 714 assert(expr->get_num_operands() <= 2); 715 for (unsigned int i = 0; i < expr->get_num_operands(); i++) { 716 expr->operands[i]->accept(this); 717 op[i] = this->result; 718 } 719 720 switch (expr->operation) { 721 case ir_unop_logic_not: 722 emit(IF(op[0], src_reg(0), BRW_CONDITIONAL_Z)); 723 return; 724 725 case ir_binop_logic_xor: 726 emit(IF(op[0], op[1], BRW_CONDITIONAL_NZ)); 727 return; 728 729 case ir_binop_logic_or: 730 temp = dst_reg(this, glsl_type::bool_type); 731 emit(OR(temp, op[0], op[1])); 732 emit(IF(src_reg(temp), src_reg(0), BRW_CONDITIONAL_NZ)); 733 return; 734 735 case ir_binop_logic_and: 736 temp = dst_reg(this, glsl_type::bool_type); 737 emit(AND(temp, op[0], op[1])); 738 emit(IF(src_reg(temp), src_reg(0), BRW_CONDITIONAL_NZ)); 739 return; 740 741 case ir_unop_f2b: 742 emit(IF(op[0], src_reg(0), BRW_CONDITIONAL_NZ)); 743 return; 744 745 case ir_unop_i2b: 746 emit(IF(op[0], src_reg(0), BRW_CONDITIONAL_NZ)); 747 return; 748 749 case ir_binop_greater: 750 case ir_binop_gequal: 751 case ir_binop_less: 752 case ir_binop_lequal: 753 case ir_binop_equal: 754 case ir_binop_nequal: 755 emit(IF(op[0], op[1], 756 brw_conditional_for_comparison(expr->operation))); 757 return; 758 759 case ir_binop_all_equal: 760 emit(CMP(dst_null_d(), op[0], op[1], BRW_CONDITIONAL_Z)); 761 emit(IF(BRW_PREDICATE_ALIGN16_ALL4H)); 762 return; 763 764 case ir_binop_any_nequal: 765 emit(CMP(dst_null_d(), op[0], op[1], BRW_CONDITIONAL_NZ)); 766 emit(IF(BRW_PREDICATE_ALIGN16_ANY4H)); 767 return; 768 769 case ir_unop_any: 770 emit(CMP(dst_null_d(), op[0], src_reg(0), BRW_CONDITIONAL_NZ)); 771 emit(IF(BRW_PREDICATE_ALIGN16_ANY4H)); 772 return; 773 774 default: 775 assert(!"not reached"); 776 emit(IF(op[0], src_reg(0), BRW_CONDITIONAL_NZ)); 777 return; 778 } 779 return; 780 } 781 782 ir->condition->accept(this); 783 784 emit(IF(this->result, src_reg(0), BRW_CONDITIONAL_NZ)); 785} 786 787void 788vec4_visitor::visit(ir_variable *ir) 789{ 790 dst_reg *reg = NULL; 791 792 if (variable_storage(ir)) 793 return; 794 795 switch (ir->mode) { 796 case ir_var_in: 797 reg = new(mem_ctx) dst_reg(ATTR, ir->location); 798 799 /* Do GL_FIXED rescaling for GLES2.0. Our GL_FIXED attributes 800 * come in as floating point conversions of the integer values. 801 */ 802 for (int i = ir->location; i < ir->location + type_size(ir->type); i++) { 803 if (!c->key.gl_fixed_input_size[i]) 804 continue; 805 806 dst_reg dst = *reg; 807 dst.type = brw_type_for_base_type(ir->type); 808 dst.writemask = (1 << c->key.gl_fixed_input_size[i]) - 1; 809 emit(MUL(dst, src_reg(dst), src_reg(1.0f / 65536.0f))); 810 } 811 break; 812 813 case ir_var_out: 814 reg = new(mem_ctx) dst_reg(this, ir->type); 815 816 for (int i = 0; i < type_size(ir->type); i++) { 817 output_reg[ir->location + i] = *reg; 818 output_reg[ir->location + i].reg_offset = i; 819 output_reg[ir->location + i].type = 820 brw_type_for_base_type(ir->type->get_scalar_type()); 821 output_reg_annotation[ir->location + i] = ir->name; 822 } 823 break; 824 825 case ir_var_auto: 826 case ir_var_temporary: 827 reg = new(mem_ctx) dst_reg(this, ir->type); 828 break; 829 830 case ir_var_uniform: 831 reg = new(this->mem_ctx) dst_reg(UNIFORM, this->uniforms); 832 833 /* Track how big the whole uniform variable is, in case we need to put a 834 * copy of its data into pull constants for array access. 835 */ 836 this->uniform_size[this->uniforms] = type_size(ir->type); 837 838 if (!strncmp(ir->name, "gl_", 3)) { 839 setup_builtin_uniform_values(ir); 840 } else { 841 setup_uniform_values(ir->location, ir->type); 842 } 843 break; 844 845 case ir_var_system_value: 846 /* VertexID is stored by the VF as the last vertex element, but 847 * we don't represent it with a flag in inputs_read, so we call 848 * it VERT_ATTRIB_MAX, which setup_attributes() picks up on. 849 */ 850 reg = new(mem_ctx) dst_reg(ATTR, VERT_ATTRIB_MAX); 851 prog_data->uses_vertexid = true; 852 853 switch (ir->location) { 854 case SYSTEM_VALUE_VERTEX_ID: 855 reg->writemask = WRITEMASK_X; 856 break; 857 case SYSTEM_VALUE_INSTANCE_ID: 858 reg->writemask = WRITEMASK_Y; 859 break; 860 default: 861 assert(!"not reached"); 862 break; 863 } 864 break; 865 866 default: 867 assert(!"not reached"); 868 } 869 870 reg->type = brw_type_for_base_type(ir->type); 871 hash_table_insert(this->variable_ht, reg, ir); 872} 873 874void 875vec4_visitor::visit(ir_loop *ir) 876{ 877 dst_reg counter; 878 879 /* We don't want debugging output to print the whole body of the 880 * loop as the annotation. 881 */ 882 this->base_ir = NULL; 883 884 if (ir->counter != NULL) { 885 this->base_ir = ir->counter; 886 ir->counter->accept(this); 887 counter = *(variable_storage(ir->counter)); 888 889 if (ir->from != NULL) { 890 this->base_ir = ir->from; 891 ir->from->accept(this); 892 893 emit(MOV(counter, this->result)); 894 } 895 } 896 897 emit(BRW_OPCODE_DO); 898 899 if (ir->to) { 900 this->base_ir = ir->to; 901 ir->to->accept(this); 902 903 emit(CMP(dst_null_d(), src_reg(counter), this->result, 904 brw_conditional_for_comparison(ir->cmp))); 905 906 vec4_instruction *inst = emit(BRW_OPCODE_BREAK); 907 inst->predicate = BRW_PREDICATE_NORMAL; 908 } 909 910 visit_instructions(&ir->body_instructions); 911 912 913 if (ir->increment) { 914 this->base_ir = ir->increment; 915 ir->increment->accept(this); 916 emit(ADD(counter, src_reg(counter), this->result)); 917 } 918 919 emit(BRW_OPCODE_WHILE); 920} 921 922void 923vec4_visitor::visit(ir_loop_jump *ir) 924{ 925 switch (ir->mode) { 926 case ir_loop_jump::jump_break: 927 emit(BRW_OPCODE_BREAK); 928 break; 929 case ir_loop_jump::jump_continue: 930 emit(BRW_OPCODE_CONTINUE); 931 break; 932 } 933} 934 935 936void 937vec4_visitor::visit(ir_function_signature *ir) 938{ 939 assert(0); 940 (void)ir; 941} 942 943void 944vec4_visitor::visit(ir_function *ir) 945{ 946 /* Ignore function bodies other than main() -- we shouldn't see calls to 947 * them since they should all be inlined. 948 */ 949 if (strcmp(ir->name, "main") == 0) { 950 const ir_function_signature *sig; 951 exec_list empty; 952 953 sig = ir->matching_signature(&empty); 954 955 assert(sig); 956 957 visit_instructions(&sig->body); 958 } 959} 960 961bool 962vec4_visitor::try_emit_sat(ir_expression *ir) 963{ 964 ir_rvalue *sat_src = ir->as_rvalue_to_saturate(); 965 if (!sat_src) 966 return false; 967 968 sat_src->accept(this); 969 src_reg src = this->result; 970 971 this->result = src_reg(this, ir->type); 972 vec4_instruction *inst; 973 inst = emit(MOV(dst_reg(this->result), src)); 974 inst->saturate = true; 975 976 return true; 977} 978 979void 980vec4_visitor::emit_bool_comparison(unsigned int op, 981 dst_reg dst, src_reg src0, src_reg src1) 982{ 983 /* original gen4 does destination conversion before comparison. */ 984 if (intel->gen < 5) 985 dst.type = src0.type; 986 987 emit(CMP(dst, src0, src1, brw_conditional_for_comparison(op))); 988 989 dst.type = BRW_REGISTER_TYPE_D; 990 emit(AND(dst, src_reg(dst), src_reg(0x1))); 991} 992 993void 994vec4_visitor::visit(ir_expression *ir) 995{ 996 unsigned int operand; 997 src_reg op[Elements(ir->operands)]; 998 src_reg result_src; 999 dst_reg result_dst; 1000 vec4_instruction *inst; 1001 1002 if (try_emit_sat(ir)) 1003 return; 1004 1005 for (operand = 0; operand < ir->get_num_operands(); operand++) { 1006 this->result.file = BAD_FILE; 1007 ir->operands[operand]->accept(this); 1008 if (this->result.file == BAD_FILE) { 1009 printf("Failed to get tree for expression operand:\n"); 1010 ir->operands[operand]->print(); 1011 exit(1); 1012 } 1013 op[operand] = this->result; 1014 1015 /* Matrix expression operands should have been broken down to vector 1016 * operations already. 1017 */ 1018 assert(!ir->operands[operand]->type->is_matrix()); 1019 } 1020 1021 int vector_elements = ir->operands[0]->type->vector_elements; 1022 if (ir->operands[1]) { 1023 vector_elements = MAX2(vector_elements, 1024 ir->operands[1]->type->vector_elements); 1025 } 1026 1027 this->result.file = BAD_FILE; 1028 1029 /* Storage for our result. Ideally for an assignment we'd be using 1030 * the actual storage for the result here, instead. 1031 */ 1032 result_src = src_reg(this, ir->type); 1033 /* convenience for the emit functions below. */ 1034 result_dst = dst_reg(result_src); 1035 /* If nothing special happens, this is the result. */ 1036 this->result = result_src; 1037 /* Limit writes to the channels that will be used by result_src later. 1038 * This does limit this temp's use as a temporary for multi-instruction 1039 * sequences. 1040 */ 1041 result_dst.writemask = (1 << ir->type->vector_elements) - 1; 1042 1043 switch (ir->operation) { 1044 case ir_unop_logic_not: 1045 /* Note that BRW_OPCODE_NOT is not appropriate here, since it is 1046 * ones complement of the whole register, not just bit 0. 1047 */ 1048 emit(XOR(result_dst, op[0], src_reg(1))); 1049 break; 1050 case ir_unop_neg: 1051 op[0].negate = !op[0].negate; 1052 this->result = op[0]; 1053 break; 1054 case ir_unop_abs: 1055 op[0].abs = true; 1056 op[0].negate = false; 1057 this->result = op[0]; 1058 break; 1059 1060 case ir_unop_sign: 1061 emit(MOV(result_dst, src_reg(0.0f))); 1062 1063 emit(CMP(dst_null_d(), op[0], src_reg(0.0f), BRW_CONDITIONAL_G)); 1064 inst = emit(MOV(result_dst, src_reg(1.0f))); 1065 inst->predicate = BRW_PREDICATE_NORMAL; 1066 1067 emit(CMP(dst_null_d(), op[0], src_reg(0.0f), BRW_CONDITIONAL_L)); 1068 inst = emit(MOV(result_dst, src_reg(-1.0f))); 1069 inst->predicate = BRW_PREDICATE_NORMAL; 1070 1071 break; 1072 1073 case ir_unop_rcp: 1074 emit_math(SHADER_OPCODE_RCP, result_dst, op[0]); 1075 break; 1076 1077 case ir_unop_exp2: 1078 emit_math(SHADER_OPCODE_EXP2, result_dst, op[0]); 1079 break; 1080 case ir_unop_log2: 1081 emit_math(SHADER_OPCODE_LOG2, result_dst, op[0]); 1082 break; 1083 case ir_unop_exp: 1084 case ir_unop_log: 1085 assert(!"not reached: should be handled by ir_explog_to_explog2"); 1086 break; 1087 case ir_unop_sin: 1088 case ir_unop_sin_reduced: 1089 emit_math(SHADER_OPCODE_SIN, result_dst, op[0]); 1090 break; 1091 case ir_unop_cos: 1092 case ir_unop_cos_reduced: 1093 emit_math(SHADER_OPCODE_COS, result_dst, op[0]); 1094 break; 1095 1096 case ir_unop_dFdx: 1097 case ir_unop_dFdy: 1098 assert(!"derivatives not valid in vertex shader"); 1099 break; 1100 1101 case ir_unop_noise: 1102 assert(!"not reached: should be handled by lower_noise"); 1103 break; 1104 1105 case ir_binop_add: 1106 emit(ADD(result_dst, op[0], op[1])); 1107 break; 1108 case ir_binop_sub: 1109 assert(!"not reached: should be handled by ir_sub_to_add_neg"); 1110 break; 1111 1112 case ir_binop_mul: 1113 if (ir->type->is_integer()) { 1114 /* For integer multiplication, the MUL uses the low 16 bits 1115 * of one of the operands (src0 on gen6, src1 on gen7). The 1116 * MACH accumulates in the contribution of the upper 16 bits 1117 * of that operand. 1118 * 1119 * FINISHME: Emit just the MUL if we know an operand is small 1120 * enough. 1121 */ 1122 struct brw_reg acc = retype(brw_acc_reg(), BRW_REGISTER_TYPE_D); 1123 1124 emit(MUL(acc, op[0], op[1])); 1125 emit(MACH(dst_null_d(), op[0], op[1])); 1126 emit(MOV(result_dst, src_reg(acc))); 1127 } else { 1128 emit(MUL(result_dst, op[0], op[1])); 1129 } 1130 break; 1131 case ir_binop_div: 1132 /* Floating point should be lowered by DIV_TO_MUL_RCP in the compiler. */ 1133 assert(ir->type->is_integer()); 1134 emit_math(SHADER_OPCODE_INT_QUOTIENT, result_dst, op[0], op[1]); 1135 break; 1136 case ir_binop_mod: 1137 /* Floating point should be lowered by MOD_TO_FRACT in the compiler. */ 1138 assert(ir->type->is_integer()); 1139 emit_math(SHADER_OPCODE_INT_REMAINDER, result_dst, op[0], op[1]); 1140 break; 1141 1142 case ir_binop_less: 1143 case ir_binop_greater: 1144 case ir_binop_lequal: 1145 case ir_binop_gequal: 1146 case ir_binop_equal: 1147 case ir_binop_nequal: { 1148 emit(CMP(result_dst, op[0], op[1], 1149 brw_conditional_for_comparison(ir->operation))); 1150 emit(AND(result_dst, result_src, src_reg(0x1))); 1151 break; 1152 } 1153 1154 case ir_binop_all_equal: 1155 /* "==" operator producing a scalar boolean. */ 1156 if (ir->operands[0]->type->is_vector() || 1157 ir->operands[1]->type->is_vector()) { 1158 emit(CMP(dst_null_d(), op[0], op[1], BRW_CONDITIONAL_Z)); 1159 emit(MOV(result_dst, src_reg(0))); 1160 inst = emit(MOV(result_dst, src_reg(1))); 1161 inst->predicate = BRW_PREDICATE_ALIGN16_ALL4H; 1162 } else { 1163 emit(CMP(result_dst, op[0], op[1], BRW_CONDITIONAL_Z)); 1164 emit(AND(result_dst, result_src, src_reg(0x1))); 1165 } 1166 break; 1167 case ir_binop_any_nequal: 1168 /* "!=" operator producing a scalar boolean. */ 1169 if (ir->operands[0]->type->is_vector() || 1170 ir->operands[1]->type->is_vector()) { 1171 emit(CMP(dst_null_d(), op[0], op[1], BRW_CONDITIONAL_NZ)); 1172 1173 emit(MOV(result_dst, src_reg(0))); 1174 inst = emit(MOV(result_dst, src_reg(1))); 1175 inst->predicate = BRW_PREDICATE_ALIGN16_ANY4H; 1176 } else { 1177 emit(CMP(result_dst, op[0], op[1], BRW_CONDITIONAL_NZ)); 1178 emit(AND(result_dst, result_src, src_reg(0x1))); 1179 } 1180 break; 1181 1182 case ir_unop_any: 1183 emit(CMP(dst_null_d(), op[0], src_reg(0), BRW_CONDITIONAL_NZ)); 1184 emit(MOV(result_dst, src_reg(0))); 1185 1186 inst = emit(MOV(result_dst, src_reg(1))); 1187 inst->predicate = BRW_PREDICATE_ALIGN16_ANY4H; 1188 break; 1189 1190 case ir_binop_logic_xor: 1191 emit(XOR(result_dst, op[0], op[1])); 1192 break; 1193 1194 case ir_binop_logic_or: 1195 emit(OR(result_dst, op[0], op[1])); 1196 break; 1197 1198 case ir_binop_logic_and: 1199 emit(AND(result_dst, op[0], op[1])); 1200 break; 1201 1202 case ir_binop_dot: 1203 assert(ir->operands[0]->type->is_vector()); 1204 assert(ir->operands[0]->type == ir->operands[1]->type); 1205 emit_dp(result_dst, op[0], op[1], ir->operands[0]->type->vector_elements); 1206 break; 1207 1208 case ir_unop_sqrt: 1209 emit_math(SHADER_OPCODE_SQRT, result_dst, op[0]); 1210 break; 1211 case ir_unop_rsq: 1212 emit_math(SHADER_OPCODE_RSQ, result_dst, op[0]); 1213 break; 1214 1215 case ir_unop_bitcast_i2f: 1216 case ir_unop_bitcast_u2f: 1217 this->result = op[0]; 1218 this->result.type = BRW_REGISTER_TYPE_F; 1219 break; 1220 1221 case ir_unop_bitcast_f2i: 1222 this->result = op[0]; 1223 this->result.type = BRW_REGISTER_TYPE_D; 1224 break; 1225 1226 case ir_unop_bitcast_f2u: 1227 this->result = op[0]; 1228 this->result.type = BRW_REGISTER_TYPE_UD; 1229 break; 1230 1231 case ir_unop_i2f: 1232 case ir_unop_i2u: 1233 case ir_unop_u2i: 1234 case ir_unop_u2f: 1235 case ir_unop_b2f: 1236 case ir_unop_b2i: 1237 case ir_unop_f2i: 1238 case ir_unop_f2u: 1239 emit(MOV(result_dst, op[0])); 1240 break; 1241 case ir_unop_f2b: 1242 case ir_unop_i2b: { 1243 emit(CMP(result_dst, op[0], src_reg(0.0f), BRW_CONDITIONAL_NZ)); 1244 emit(AND(result_dst, result_src, src_reg(1))); 1245 break; 1246 } 1247 1248 case ir_unop_trunc: 1249 emit(RNDZ(result_dst, op[0])); 1250 break; 1251 case ir_unop_ceil: 1252 op[0].negate = !op[0].negate; 1253 inst = emit(RNDD(result_dst, op[0])); 1254 this->result.negate = true; 1255 break; 1256 case ir_unop_floor: 1257 inst = emit(RNDD(result_dst, op[0])); 1258 break; 1259 case ir_unop_fract: 1260 inst = emit(FRC(result_dst, op[0])); 1261 break; 1262 case ir_unop_round_even: 1263 emit(RNDE(result_dst, op[0])); 1264 break; 1265 1266 case ir_binop_min: 1267 if (intel->gen >= 6) { 1268 inst = emit(BRW_OPCODE_SEL, result_dst, op[0], op[1]); 1269 inst->conditional_mod = BRW_CONDITIONAL_L; 1270 } else { 1271 emit(CMP(result_dst, op[0], op[1], BRW_CONDITIONAL_L)); 1272 1273 inst = emit(BRW_OPCODE_SEL, result_dst, op[0], op[1]); 1274 inst->predicate = BRW_PREDICATE_NORMAL; 1275 } 1276 break; 1277 case ir_binop_max: 1278 if (intel->gen >= 6) { 1279 inst = emit(BRW_OPCODE_SEL, result_dst, op[0], op[1]); 1280 inst->conditional_mod = BRW_CONDITIONAL_G; 1281 } else { 1282 emit(CMP(result_dst, op[0], op[1], BRW_CONDITIONAL_G)); 1283 1284 inst = emit(BRW_OPCODE_SEL, result_dst, op[0], op[1]); 1285 inst->predicate = BRW_PREDICATE_NORMAL; 1286 } 1287 break; 1288 1289 case ir_binop_pow: 1290 emit_math(SHADER_OPCODE_POW, result_dst, op[0], op[1]); 1291 break; 1292 1293 case ir_unop_bit_not: 1294 inst = emit(NOT(result_dst, op[0])); 1295 break; 1296 case ir_binop_bit_and: 1297 inst = emit(AND(result_dst, op[0], op[1])); 1298 break; 1299 case ir_binop_bit_xor: 1300 inst = emit(XOR(result_dst, op[0], op[1])); 1301 break; 1302 case ir_binop_bit_or: 1303 inst = emit(OR(result_dst, op[0], op[1])); 1304 break; 1305 1306 case ir_binop_lshift: 1307 inst = emit(BRW_OPCODE_SHL, result_dst, op[0], op[1]); 1308 break; 1309 1310 case ir_binop_rshift: 1311 if (ir->type->base_type == GLSL_TYPE_INT) 1312 inst = emit(BRW_OPCODE_ASR, result_dst, op[0], op[1]); 1313 else 1314 inst = emit(BRW_OPCODE_SHR, result_dst, op[0], op[1]); 1315 break; 1316 1317 case ir_binop_ubo_load: 1318 assert(!"not yet supported"); 1319 break; 1320 1321 case ir_quadop_vector: 1322 assert(!"not reached: should be handled by lower_quadop_vector"); 1323 break; 1324 } 1325} 1326 1327 1328void 1329vec4_visitor::visit(ir_swizzle *ir) 1330{ 1331 src_reg src; 1332 int i = 0; 1333 int swizzle[4]; 1334 1335 /* Note that this is only swizzles in expressions, not those on the left 1336 * hand side of an assignment, which do write masking. See ir_assignment 1337 * for that. 1338 */ 1339 1340 ir->val->accept(this); 1341 src = this->result; 1342 assert(src.file != BAD_FILE); 1343 1344 for (i = 0; i < ir->type->vector_elements; i++) { 1345 switch (i) { 1346 case 0: 1347 swizzle[i] = BRW_GET_SWZ(src.swizzle, ir->mask.x); 1348 break; 1349 case 1: 1350 swizzle[i] = BRW_GET_SWZ(src.swizzle, ir->mask.y); 1351 break; 1352 case 2: 1353 swizzle[i] = BRW_GET_SWZ(src.swizzle, ir->mask.z); 1354 break; 1355 case 3: 1356 swizzle[i] = BRW_GET_SWZ(src.swizzle, ir->mask.w); 1357 break; 1358 } 1359 } 1360 for (; i < 4; i++) { 1361 /* Replicate the last channel out. */ 1362 swizzle[i] = swizzle[ir->type->vector_elements - 1]; 1363 } 1364 1365 src.swizzle = BRW_SWIZZLE4(swizzle[0], swizzle[1], swizzle[2], swizzle[3]); 1366 1367 this->result = src; 1368} 1369 1370void 1371vec4_visitor::visit(ir_dereference_variable *ir) 1372{ 1373 const struct glsl_type *type = ir->type; 1374 dst_reg *reg = variable_storage(ir->var); 1375 1376 if (!reg) { 1377 fail("Failed to find variable storage for %s\n", ir->var->name); 1378 this->result = src_reg(brw_null_reg()); 1379 return; 1380 } 1381 1382 this->result = src_reg(*reg); 1383 1384 /* System values get their swizzle from the dst_reg writemask */ 1385 if (ir->var->mode == ir_var_system_value) 1386 return; 1387 1388 if (type->is_scalar() || type->is_vector() || type->is_matrix()) 1389 this->result.swizzle = swizzle_for_size(type->vector_elements); 1390} 1391 1392void 1393vec4_visitor::visit(ir_dereference_array *ir) 1394{ 1395 ir_constant *constant_index; 1396 src_reg src; 1397 int element_size = type_size(ir->type); 1398 1399 constant_index = ir->array_index->constant_expression_value(); 1400 1401 ir->array->accept(this); 1402 src = this->result; 1403 1404 if (constant_index) { 1405 src.reg_offset += constant_index->value.i[0] * element_size; 1406 } else { 1407 /* Variable index array dereference. It eats the "vec4" of the 1408 * base of the array and an index that offsets the Mesa register 1409 * index. 1410 */ 1411 ir->array_index->accept(this); 1412 1413 src_reg index_reg; 1414 1415 if (element_size == 1) { 1416 index_reg = this->result; 1417 } else { 1418 index_reg = src_reg(this, glsl_type::int_type); 1419 1420 emit(MUL(dst_reg(index_reg), this->result, src_reg(element_size))); 1421 } 1422 1423 if (src.reladdr) { 1424 src_reg temp = src_reg(this, glsl_type::int_type); 1425 1426 emit(ADD(dst_reg(temp), *src.reladdr, index_reg)); 1427 1428 index_reg = temp; 1429 } 1430 1431 src.reladdr = ralloc(mem_ctx, src_reg); 1432 memcpy(src.reladdr, &index_reg, sizeof(index_reg)); 1433 } 1434 1435 /* If the type is smaller than a vec4, replicate the last channel out. */ 1436 if (ir->type->is_scalar() || ir->type->is_vector() || ir->type->is_matrix()) 1437 src.swizzle = swizzle_for_size(ir->type->vector_elements); 1438 else 1439 src.swizzle = BRW_SWIZZLE_NOOP; 1440 src.type = brw_type_for_base_type(ir->type); 1441 1442 this->result = src; 1443} 1444 1445void 1446vec4_visitor::visit(ir_dereference_record *ir) 1447{ 1448 unsigned int i; 1449 const glsl_type *struct_type = ir->record->type; 1450 int offset = 0; 1451 1452 ir->record->accept(this); 1453 1454 for (i = 0; i < struct_type->length; i++) { 1455 if (strcmp(struct_type->fields.structure[i].name, ir->field) == 0) 1456 break; 1457 offset += type_size(struct_type->fields.structure[i].type); 1458 } 1459 1460 /* If the type is smaller than a vec4, replicate the last channel out. */ 1461 if (ir->type->is_scalar() || ir->type->is_vector() || ir->type->is_matrix()) 1462 this->result.swizzle = swizzle_for_size(ir->type->vector_elements); 1463 else 1464 this->result.swizzle = BRW_SWIZZLE_NOOP; 1465 this->result.type = brw_type_for_base_type(ir->type); 1466 1467 this->result.reg_offset += offset; 1468} 1469 1470/** 1471 * We want to be careful in assignment setup to hit the actual storage 1472 * instead of potentially using a temporary like we might with the 1473 * ir_dereference handler. 1474 */ 1475static dst_reg 1476get_assignment_lhs(ir_dereference *ir, vec4_visitor *v) 1477{ 1478 /* The LHS must be a dereference. If the LHS is a variable indexed array 1479 * access of a vector, it must be separated into a series conditional moves 1480 * before reaching this point (see ir_vec_index_to_cond_assign). 1481 */ 1482 assert(ir->as_dereference()); 1483 ir_dereference_array *deref_array = ir->as_dereference_array(); 1484 if (deref_array) { 1485 assert(!deref_array->array->type->is_vector()); 1486 } 1487 1488 /* Use the rvalue deref handler for the most part. We'll ignore 1489 * swizzles in it and write swizzles using writemask, though. 1490 */ 1491 ir->accept(v); 1492 return dst_reg(v->result); 1493} 1494 1495void 1496vec4_visitor::emit_block_move(dst_reg *dst, src_reg *src, 1497 const struct glsl_type *type, uint32_t predicate) 1498{ 1499 if (type->base_type == GLSL_TYPE_STRUCT) { 1500 for (unsigned int i = 0; i < type->length; i++) { 1501 emit_block_move(dst, src, type->fields.structure[i].type, predicate); 1502 } 1503 return; 1504 } 1505 1506 if (type->is_array()) { 1507 for (unsigned int i = 0; i < type->length; i++) { 1508 emit_block_move(dst, src, type->fields.array, predicate); 1509 } 1510 return; 1511 } 1512 1513 if (type->is_matrix()) { 1514 const struct glsl_type *vec_type; 1515 1516 vec_type = glsl_type::get_instance(GLSL_TYPE_FLOAT, 1517 type->vector_elements, 1); 1518 1519 for (int i = 0; i < type->matrix_columns; i++) { 1520 emit_block_move(dst, src, vec_type, predicate); 1521 } 1522 return; 1523 } 1524 1525 assert(type->is_scalar() || type->is_vector()); 1526 1527 dst->type = brw_type_for_base_type(type); 1528 src->type = dst->type; 1529 1530 dst->writemask = (1 << type->vector_elements) - 1; 1531 1532 src->swizzle = swizzle_for_size(type->vector_elements); 1533 1534 vec4_instruction *inst = emit(MOV(*dst, *src)); 1535 inst->predicate = predicate; 1536 1537 dst->reg_offset++; 1538 src->reg_offset++; 1539} 1540 1541 1542/* If the RHS processing resulted in an instruction generating a 1543 * temporary value, and it would be easy to rewrite the instruction to 1544 * generate its result right into the LHS instead, do so. This ends 1545 * up reliably removing instructions where it can be tricky to do so 1546 * later without real UD chain information. 1547 */ 1548bool 1549vec4_visitor::try_rewrite_rhs_to_dst(ir_assignment *ir, 1550 dst_reg dst, 1551 src_reg src, 1552 vec4_instruction *pre_rhs_inst, 1553 vec4_instruction *last_rhs_inst) 1554{ 1555 /* This could be supported, but it would take more smarts. */ 1556 if (ir->condition) 1557 return false; 1558 1559 if (pre_rhs_inst == last_rhs_inst) 1560 return false; /* No instructions generated to work with. */ 1561 1562 /* Make sure the last instruction generated our source reg. */ 1563 if (src.file != GRF || 1564 src.file != last_rhs_inst->dst.file || 1565 src.reg != last_rhs_inst->dst.reg || 1566 src.reg_offset != last_rhs_inst->dst.reg_offset || 1567 src.reladdr || 1568 src.abs || 1569 src.negate || 1570 last_rhs_inst->predicate != BRW_PREDICATE_NONE) 1571 return false; 1572 1573 /* Check that that last instruction fully initialized the channels 1574 * we want to use, in the order we want to use them. We could 1575 * potentially reswizzle the operands of many instructions so that 1576 * we could handle out of order channels, but don't yet. 1577 */ 1578 1579 for (unsigned i = 0; i < 4; i++) { 1580 if (dst.writemask & (1 << i)) { 1581 if (!(last_rhs_inst->dst.writemask & (1 << i))) 1582 return false; 1583 1584 if (BRW_GET_SWZ(src.swizzle, i) != i) 1585 return false; 1586 } 1587 } 1588 1589 /* Success! Rewrite the instruction. */ 1590 last_rhs_inst->dst.file = dst.file; 1591 last_rhs_inst->dst.reg = dst.reg; 1592 last_rhs_inst->dst.reg_offset = dst.reg_offset; 1593 last_rhs_inst->dst.reladdr = dst.reladdr; 1594 last_rhs_inst->dst.writemask &= dst.writemask; 1595 1596 return true; 1597} 1598 1599void 1600vec4_visitor::visit(ir_assignment *ir) 1601{ 1602 dst_reg dst = get_assignment_lhs(ir->lhs, this); 1603 uint32_t predicate = BRW_PREDICATE_NONE; 1604 1605 if (!ir->lhs->type->is_scalar() && 1606 !ir->lhs->type->is_vector()) { 1607 ir->rhs->accept(this); 1608 src_reg src = this->result; 1609 1610 if (ir->condition) { 1611 emit_bool_to_cond_code(ir->condition, &predicate); 1612 } 1613 1614 /* emit_block_move doesn't account for swizzles in the source register. 1615 * This should be ok, since the source register is a structure or an 1616 * array, and those can't be swizzled. But double-check to be sure. 1617 */ 1618 assert(src.swizzle == 1619 (ir->rhs->type->is_matrix() 1620 ? swizzle_for_size(ir->rhs->type->vector_elements) 1621 : BRW_SWIZZLE_NOOP)); 1622 1623 emit_block_move(&dst, &src, ir->rhs->type, predicate); 1624 return; 1625 } 1626 1627 /* Now we're down to just a scalar/vector with writemasks. */ 1628 int i; 1629 1630 vec4_instruction *pre_rhs_inst, *last_rhs_inst; 1631 pre_rhs_inst = (vec4_instruction *)this->instructions.get_tail(); 1632 1633 ir->rhs->accept(this); 1634 1635 last_rhs_inst = (vec4_instruction *)this->instructions.get_tail(); 1636 1637 src_reg src = this->result; 1638 1639 int swizzles[4]; 1640 int first_enabled_chan = 0; 1641 int src_chan = 0; 1642 1643 assert(ir->lhs->type->is_vector() || 1644 ir->lhs->type->is_scalar()); 1645 dst.writemask = ir->write_mask; 1646 1647 for (int i = 0; i < 4; i++) { 1648 if (dst.writemask & (1 << i)) { 1649 first_enabled_chan = BRW_GET_SWZ(src.swizzle, i); 1650 break; 1651 } 1652 } 1653 1654 /* Swizzle a small RHS vector into the channels being written. 1655 * 1656 * glsl ir treats write_mask as dictating how many channels are 1657 * present on the RHS while in our instructions we need to make 1658 * those channels appear in the slots of the vec4 they're written to. 1659 */ 1660 for (int i = 0; i < 4; i++) { 1661 if (dst.writemask & (1 << i)) 1662 swizzles[i] = BRW_GET_SWZ(src.swizzle, src_chan++); 1663 else 1664 swizzles[i] = first_enabled_chan; 1665 } 1666 src.swizzle = BRW_SWIZZLE4(swizzles[0], swizzles[1], 1667 swizzles[2], swizzles[3]); 1668 1669 if (try_rewrite_rhs_to_dst(ir, dst, src, pre_rhs_inst, last_rhs_inst)) { 1670 return; 1671 } 1672 1673 if (ir->condition) { 1674 emit_bool_to_cond_code(ir->condition, &predicate); 1675 } 1676 1677 for (i = 0; i < type_size(ir->lhs->type); i++) { 1678 vec4_instruction *inst = emit(MOV(dst, src)); 1679 inst->predicate = predicate; 1680 1681 dst.reg_offset++; 1682 src.reg_offset++; 1683 } 1684} 1685 1686void 1687vec4_visitor::emit_constant_values(dst_reg *dst, ir_constant *ir) 1688{ 1689 if (ir->type->base_type == GLSL_TYPE_STRUCT) { 1690 foreach_list(node, &ir->components) { 1691 ir_constant *field_value = (ir_constant *)node; 1692 1693 emit_constant_values(dst, field_value); 1694 } 1695 return; 1696 } 1697 1698 if (ir->type->is_array()) { 1699 for (unsigned int i = 0; i < ir->type->length; i++) { 1700 emit_constant_values(dst, ir->array_elements[i]); 1701 } 1702 return; 1703 } 1704 1705 if (ir->type->is_matrix()) { 1706 for (int i = 0; i < ir->type->matrix_columns; i++) { 1707 float *vec = &ir->value.f[i * ir->type->vector_elements]; 1708 1709 for (int j = 0; j < ir->type->vector_elements; j++) { 1710 dst->writemask = 1 << j; 1711 dst->type = BRW_REGISTER_TYPE_F; 1712 1713 emit(MOV(*dst, src_reg(vec[j]))); 1714 } 1715 dst->reg_offset++; 1716 } 1717 return; 1718 } 1719 1720 int remaining_writemask = (1 << ir->type->vector_elements) - 1; 1721 1722 for (int i = 0; i < ir->type->vector_elements; i++) { 1723 if (!(remaining_writemask & (1 << i))) 1724 continue; 1725 1726 dst->writemask = 1 << i; 1727 dst->type = brw_type_for_base_type(ir->type); 1728 1729 /* Find other components that match the one we're about to 1730 * write. Emits fewer instructions for things like vec4(0.5, 1731 * 1.5, 1.5, 1.5). 1732 */ 1733 for (int j = i + 1; j < ir->type->vector_elements; j++) { 1734 if (ir->type->base_type == GLSL_TYPE_BOOL) { 1735 if (ir->value.b[i] == ir->value.b[j]) 1736 dst->writemask |= (1 << j); 1737 } else { 1738 /* u, i, and f storage all line up, so no need for a 1739 * switch case for comparing each type. 1740 */ 1741 if (ir->value.u[i] == ir->value.u[j]) 1742 dst->writemask |= (1 << j); 1743 } 1744 } 1745 1746 switch (ir->type->base_type) { 1747 case GLSL_TYPE_FLOAT: 1748 emit(MOV(*dst, src_reg(ir->value.f[i]))); 1749 break; 1750 case GLSL_TYPE_INT: 1751 emit(MOV(*dst, src_reg(ir->value.i[i]))); 1752 break; 1753 case GLSL_TYPE_UINT: 1754 emit(MOV(*dst, src_reg(ir->value.u[i]))); 1755 break; 1756 case GLSL_TYPE_BOOL: 1757 emit(MOV(*dst, src_reg(ir->value.b[i]))); 1758 break; 1759 default: 1760 assert(!"Non-float/uint/int/bool constant"); 1761 break; 1762 } 1763 1764 remaining_writemask &= ~dst->writemask; 1765 } 1766 dst->reg_offset++; 1767} 1768 1769void 1770vec4_visitor::visit(ir_constant *ir) 1771{ 1772 dst_reg dst = dst_reg(this, ir->type); 1773 this->result = src_reg(dst); 1774 1775 emit_constant_values(&dst, ir); 1776} 1777 1778void 1779vec4_visitor::visit(ir_call *ir) 1780{ 1781 assert(!"not reached"); 1782} 1783 1784void 1785vec4_visitor::visit(ir_texture *ir) 1786{ 1787 int sampler = _mesa_get_sampler_uniform_value(ir->sampler, prog, &vp->Base); 1788 sampler = vp->Base.SamplerUnits[sampler]; 1789 1790 /* Should be lowered by do_lower_texture_projection */ 1791 assert(!ir->projector); 1792 1793 /* Generate code to compute all the subexpression trees. This has to be 1794 * done before loading any values into MRFs for the sampler message since 1795 * generating these values may involve SEND messages that need the MRFs. 1796 */ 1797 src_reg coordinate; 1798 if (ir->coordinate) { 1799 ir->coordinate->accept(this); 1800 coordinate = this->result; 1801 } 1802 1803 src_reg shadow_comparitor; 1804 if (ir->shadow_comparitor) { 1805 ir->shadow_comparitor->accept(this); 1806 shadow_comparitor = this->result; 1807 } 1808 1809 src_reg lod, dPdx, dPdy; 1810 switch (ir->op) { 1811 case ir_txf: 1812 case ir_txl: 1813 case ir_txs: 1814 ir->lod_info.lod->accept(this); 1815 lod = this->result; 1816 break; 1817 case ir_txd: 1818 ir->lod_info.grad.dPdx->accept(this); 1819 dPdx = this->result; 1820 1821 ir->lod_info.grad.dPdy->accept(this); 1822 dPdy = this->result; 1823 break; 1824 case ir_tex: 1825 case ir_txb: 1826 break; 1827 } 1828 1829 vec4_instruction *inst = NULL; 1830 switch (ir->op) { 1831 case ir_tex: 1832 case ir_txl: 1833 inst = new(mem_ctx) vec4_instruction(this, SHADER_OPCODE_TXL); 1834 break; 1835 case ir_txd: 1836 inst = new(mem_ctx) vec4_instruction(this, SHADER_OPCODE_TXD); 1837 break; 1838 case ir_txf: 1839 inst = new(mem_ctx) vec4_instruction(this, SHADER_OPCODE_TXF); 1840 break; 1841 case ir_txs: 1842 inst = new(mem_ctx) vec4_instruction(this, SHADER_OPCODE_TXS); 1843 break; 1844 case ir_txb: 1845 assert(!"TXB is not valid for vertex shaders."); 1846 } 1847 1848 /* Texel offsets go in the message header; Gen4 also requires headers. */ 1849 inst->header_present = ir->offset || intel->gen < 5; 1850 inst->base_mrf = 2; 1851 inst->mlen = inst->header_present + 1; /* always at least one */ 1852 inst->sampler = sampler; 1853 inst->dst = dst_reg(this, ir->type); 1854 inst->shadow_compare = ir->shadow_comparitor != NULL; 1855 1856 if (ir->offset != NULL && ir->op != ir_txf) 1857 inst->texture_offset = brw_texture_offset(ir->offset->as_constant()); 1858 1859 /* MRF for the first parameter */ 1860 int param_base = inst->base_mrf + inst->header_present; 1861 1862 if (ir->op == ir_txs) { 1863 int writemask = intel->gen == 4 ? WRITEMASK_W : WRITEMASK_X; 1864 emit(MOV(dst_reg(MRF, param_base, ir->lod_info.lod->type, writemask), 1865 lod)); 1866 } else { 1867 int i, coord_mask = 0, zero_mask = 0; 1868 /* Load the coordinate */ 1869 /* FINISHME: gl_clamp_mask and saturate */ 1870 for (i = 0; i < ir->coordinate->type->vector_elements; i++) 1871 coord_mask |= (1 << i); 1872 for (; i < 4; i++) 1873 zero_mask |= (1 << i); 1874 1875 if (ir->offset && ir->op == ir_txf) { 1876 /* It appears that the ld instruction used for txf does its 1877 * address bounds check before adding in the offset. To work 1878 * around this, just add the integer offset to the integer 1879 * texel coordinate, and don't put the offset in the header. 1880 */ 1881 ir_constant *offset = ir->offset->as_constant(); 1882 assert(offset); 1883 1884 for (int j = 0; j < ir->coordinate->type->vector_elements; j++) { 1885 src_reg src = coordinate; 1886 src.swizzle = BRW_SWIZZLE4(BRW_GET_SWZ(src.swizzle, j), 1887 BRW_GET_SWZ(src.swizzle, j), 1888 BRW_GET_SWZ(src.swizzle, j), 1889 BRW_GET_SWZ(src.swizzle, j)); 1890 emit(ADD(dst_reg(MRF, param_base, ir->coordinate->type, 1 << j), 1891 src, offset->value.i[j])); 1892 } 1893 } else { 1894 emit(MOV(dst_reg(MRF, param_base, ir->coordinate->type, coord_mask), 1895 coordinate)); 1896 } 1897 emit(MOV(dst_reg(MRF, param_base, ir->coordinate->type, zero_mask), 1898 src_reg(0))); 1899 /* Load the shadow comparitor */ 1900 if (ir->shadow_comparitor) { 1901 emit(MOV(dst_reg(MRF, param_base + 1, ir->shadow_comparitor->type, 1902 WRITEMASK_X), 1903 shadow_comparitor)); 1904 inst->mlen++; 1905 } 1906 1907 /* Load the LOD info */ 1908 if (ir->op == ir_txl) { 1909 int mrf, writemask; 1910 if (intel->gen >= 5) { 1911 mrf = param_base + 1; 1912 if (ir->shadow_comparitor) { 1913 writemask = WRITEMASK_Y; 1914 /* mlen already incremented */ 1915 } else { 1916 writemask = WRITEMASK_X; 1917 inst->mlen++; 1918 } 1919 } else /* intel->gen == 4 */ { 1920 mrf = param_base; 1921 writemask = WRITEMASK_Z; 1922 } 1923 emit(MOV(dst_reg(MRF, mrf, ir->lod_info.lod->type, writemask), lod)); 1924 } else if (ir->op == ir_txf) { 1925 emit(MOV(dst_reg(MRF, param_base, ir->lod_info.lod->type, WRITEMASK_W), 1926 lod)); 1927 } else if (ir->op == ir_txd) { 1928 const glsl_type *type = ir->lod_info.grad.dPdx->type; 1929 1930 if (intel->gen >= 5) { 1931 dPdx.swizzle = BRW_SWIZZLE4(SWIZZLE_X,SWIZZLE_X,SWIZZLE_Y,SWIZZLE_Y); 1932 dPdy.swizzle = BRW_SWIZZLE4(SWIZZLE_X,SWIZZLE_X,SWIZZLE_Y,SWIZZLE_Y); 1933 emit(MOV(dst_reg(MRF, param_base + 1, type, WRITEMASK_XZ), dPdx)); 1934 emit(MOV(dst_reg(MRF, param_base + 1, type, WRITEMASK_YW), dPdy)); 1935 inst->mlen++; 1936 1937 if (ir->type->vector_elements == 3) { 1938 dPdx.swizzle = BRW_SWIZZLE_ZZZZ; 1939 dPdy.swizzle = BRW_SWIZZLE_ZZZZ; 1940 emit(MOV(dst_reg(MRF, param_base + 2, type, WRITEMASK_X), dPdx)); 1941 emit(MOV(dst_reg(MRF, param_base + 2, type, WRITEMASK_Y), dPdy)); 1942 inst->mlen++; 1943 } 1944 } else /* intel->gen == 4 */ { 1945 emit(MOV(dst_reg(MRF, param_base + 1, type, WRITEMASK_XYZ), dPdx)); 1946 emit(MOV(dst_reg(MRF, param_base + 2, type, WRITEMASK_XYZ), dPdy)); 1947 inst->mlen += 2; 1948 } 1949 } 1950 } 1951 1952 emit(inst); 1953 1954 swizzle_result(ir, src_reg(inst->dst), sampler); 1955} 1956 1957void 1958vec4_visitor::swizzle_result(ir_texture *ir, src_reg orig_val, int sampler) 1959{ 1960 this->result = orig_val; 1961 1962 int s = c->key.tex.swizzles[sampler]; 1963 1964 if (ir->op == ir_txs || ir->type == glsl_type::float_type 1965 || s == SWIZZLE_NOOP) 1966 return; 1967 1968 int zero_mask = 0, one_mask = 0, copy_mask = 0; 1969 int swizzle[4]; 1970 1971 for (int i = 0; i < 4; i++) { 1972 switch (GET_SWZ(s, i)) { 1973 case SWIZZLE_ZERO: 1974 zero_mask |= (1 << i); 1975 break; 1976 case SWIZZLE_ONE: 1977 one_mask |= (1 << i); 1978 break; 1979 default: 1980 copy_mask |= (1 << i); 1981 swizzle[i] = GET_SWZ(s, i); 1982 break; 1983 } 1984 } 1985 1986 this->result = src_reg(this, ir->type); 1987 dst_reg swizzled_result(this->result); 1988 1989 if (copy_mask) { 1990 orig_val.swizzle = BRW_SWIZZLE4(swizzle[0], swizzle[1], swizzle[2], swizzle[3]); 1991 swizzled_result.writemask = copy_mask; 1992 emit(MOV(swizzled_result, orig_val)); 1993 } 1994 1995 if (zero_mask) { 1996 swizzled_result.writemask = zero_mask; 1997 emit(MOV(swizzled_result, src_reg(0.0f))); 1998 } 1999 2000 if (one_mask) { 2001 swizzled_result.writemask = one_mask; 2002 emit(MOV(swizzled_result, src_reg(1.0f))); 2003 } 2004} 2005 2006void 2007vec4_visitor::visit(ir_return *ir) 2008{ 2009 assert(!"not reached"); 2010} 2011 2012void 2013vec4_visitor::visit(ir_discard *ir) 2014{ 2015 assert(!"not reached"); 2016} 2017 2018void 2019vec4_visitor::visit(ir_if *ir) 2020{ 2021 /* Don't point the annotation at the if statement, because then it plus 2022 * the then and else blocks get printed. 2023 */ 2024 this->base_ir = ir->condition; 2025 2026 if (intel->gen == 6) { 2027 emit_if_gen6(ir); 2028 } else { 2029 uint32_t predicate; 2030 emit_bool_to_cond_code(ir->condition, &predicate); 2031 emit(IF(predicate)); 2032 } 2033 2034 visit_instructions(&ir->then_instructions); 2035 2036 if (!ir->else_instructions.is_empty()) { 2037 this->base_ir = ir->condition; 2038 emit(BRW_OPCODE_ELSE); 2039 2040 visit_instructions(&ir->else_instructions); 2041 } 2042 2043 this->base_ir = ir->condition; 2044 emit(BRW_OPCODE_ENDIF); 2045} 2046 2047void 2048vec4_visitor::emit_ndc_computation() 2049{ 2050 /* Get the position */ 2051 src_reg pos = src_reg(output_reg[VERT_RESULT_HPOS]); 2052 2053 /* Build ndc coords, which are (x/w, y/w, z/w, 1/w) */ 2054 dst_reg ndc = dst_reg(this, glsl_type::vec4_type); 2055 output_reg[BRW_VERT_RESULT_NDC] = ndc; 2056 2057 current_annotation = "NDC"; 2058 dst_reg ndc_w = ndc; 2059 ndc_w.writemask = WRITEMASK_W; 2060 src_reg pos_w = pos; 2061 pos_w.swizzle = BRW_SWIZZLE4(SWIZZLE_W, SWIZZLE_W, SWIZZLE_W, SWIZZLE_W); 2062 emit_math(SHADER_OPCODE_RCP, ndc_w, pos_w); 2063 2064 dst_reg ndc_xyz = ndc; 2065 ndc_xyz.writemask = WRITEMASK_XYZ; 2066 2067 emit(MUL(ndc_xyz, pos, src_reg(ndc_w))); 2068} 2069 2070void 2071vec4_visitor::emit_psiz_and_flags(struct brw_reg reg) 2072{ 2073 if (intel->gen < 6 && 2074 ((c->prog_data.outputs_written & BITFIELD64_BIT(VERT_RESULT_PSIZ)) || 2075 c->key.userclip_active || brw->has_negative_rhw_bug)) { 2076 dst_reg header1 = dst_reg(this, glsl_type::uvec4_type); 2077 dst_reg header1_w = header1; 2078 header1_w.writemask = WRITEMASK_W; 2079 GLuint i; 2080 2081 emit(MOV(header1, 0u)); 2082 2083 if (c->prog_data.outputs_written & BITFIELD64_BIT(VERT_RESULT_PSIZ)) { 2084 src_reg psiz = src_reg(output_reg[VERT_RESULT_PSIZ]); 2085 2086 current_annotation = "Point size"; 2087 emit(MUL(header1_w, psiz, src_reg((float)(1 << 11)))); 2088 emit(AND(header1_w, src_reg(header1_w), 0x7ff << 8)); 2089 } 2090 2091 current_annotation = "Clipping flags"; 2092 for (i = 0; i < c->key.nr_userclip_plane_consts; i++) { 2093 vec4_instruction *inst; 2094 2095 inst = emit(DP4(dst_null_f(), src_reg(output_reg[VERT_RESULT_HPOS]), 2096 src_reg(this->userplane[i]))); 2097 inst->conditional_mod = BRW_CONDITIONAL_L; 2098 2099 inst = emit(OR(header1_w, src_reg(header1_w), 1u << i)); 2100 inst->predicate = BRW_PREDICATE_NORMAL; 2101 } 2102 2103 /* i965 clipping workaround: 2104 * 1) Test for -ve rhw 2105 * 2) If set, 2106 * set ndc = (0,0,0,0) 2107 * set ucp[6] = 1 2108 * 2109 * Later, clipping will detect ucp[6] and ensure the primitive is 2110 * clipped against all fixed planes. 2111 */ 2112 if (brw->has_negative_rhw_bug) { 2113#if 0 2114 /* FINISHME */ 2115 brw_CMP(p, 2116 vec8(brw_null_reg()), 2117 BRW_CONDITIONAL_L, 2118 brw_swizzle1(output_reg[BRW_VERT_RESULT_NDC], 3), 2119 brw_imm_f(0)); 2120 2121 brw_OR(p, brw_writemask(header1, WRITEMASK_W), header1, brw_imm_ud(1<<6)); 2122 brw_MOV(p, output_reg[BRW_VERT_RESULT_NDC], brw_imm_f(0)); 2123 brw_set_predicate_control(p, BRW_PREDICATE_NONE); 2124#endif 2125 } 2126 2127 emit(MOV(retype(reg, BRW_REGISTER_TYPE_UD), src_reg(header1))); 2128 } else if (intel->gen < 6) { 2129 emit(MOV(retype(reg, BRW_REGISTER_TYPE_UD), 0u)); 2130 } else { 2131 emit(MOV(retype(reg, BRW_REGISTER_TYPE_D), src_reg(0))); 2132 if (c->prog_data.outputs_written & BITFIELD64_BIT(VERT_RESULT_PSIZ)) { 2133 emit(MOV(brw_writemask(reg, WRITEMASK_W), 2134 src_reg(output_reg[VERT_RESULT_PSIZ]))); 2135 } 2136 } 2137} 2138 2139void 2140vec4_visitor::emit_clip_distances(struct brw_reg reg, int offset) 2141{ 2142 if (intel->gen < 6) { 2143 /* Clip distance slots are set aside in gen5, but they are not used. It 2144 * is not clear whether we actually need to set aside space for them, 2145 * but the performance cost is negligible. 2146 */ 2147 return; 2148 } 2149 2150 /* From the GLSL 1.30 spec, section 7.1 (Vertex Shader Special Variables): 2151 * 2152 * "If a linked set of shaders forming the vertex stage contains no 2153 * static write to gl_ClipVertex or gl_ClipDistance, but the 2154 * application has requested clipping against user clip planes through 2155 * the API, then the coordinate written to gl_Position is used for 2156 * comparison against the user clip planes." 2157 * 2158 * This function is only called if the shader didn't write to 2159 * gl_ClipDistance. Accordingly, we use gl_ClipVertex to perform clipping 2160 * if the user wrote to it; otherwise we use gl_Position. 2161 */ 2162 gl_vert_result clip_vertex = VERT_RESULT_CLIP_VERTEX; 2163 if (!(c->prog_data.outputs_written 2164 & BITFIELD64_BIT(VERT_RESULT_CLIP_VERTEX))) { 2165 clip_vertex = VERT_RESULT_HPOS; 2166 } 2167 2168 for (int i = 0; i + offset < c->key.nr_userclip_plane_consts && i < 4; 2169 ++i) { 2170 emit(DP4(dst_reg(brw_writemask(reg, 1 << i)), 2171 src_reg(output_reg[clip_vertex]), 2172 src_reg(this->userplane[i + offset]))); 2173 } 2174} 2175 2176void 2177vec4_visitor::emit_generic_urb_slot(dst_reg reg, int vert_result) 2178{ 2179 assert (vert_result < VERT_RESULT_MAX); 2180 reg.type = output_reg[vert_result].type; 2181 current_annotation = output_reg_annotation[vert_result]; 2182 /* Copy the register, saturating if necessary */ 2183 vec4_instruction *inst = emit(MOV(reg, 2184 src_reg(output_reg[vert_result]))); 2185 if ((vert_result == VERT_RESULT_COL0 || 2186 vert_result == VERT_RESULT_COL1 || 2187 vert_result == VERT_RESULT_BFC0 || 2188 vert_result == VERT_RESULT_BFC1) && 2189 c->key.clamp_vertex_color) { 2190 inst->saturate = true; 2191 } 2192} 2193 2194void 2195vec4_visitor::emit_urb_slot(int mrf, int vert_result) 2196{ 2197 struct brw_reg hw_reg = brw_message_reg(mrf); 2198 dst_reg reg = dst_reg(MRF, mrf); 2199 reg.type = BRW_REGISTER_TYPE_F; 2200 2201 switch (vert_result) { 2202 case VERT_RESULT_PSIZ: 2203 /* PSIZ is always in slot 0, and is coupled with other flags. */ 2204 current_annotation = "indices, point width, clip flags"; 2205 emit_psiz_and_flags(hw_reg); 2206 break; 2207 case BRW_VERT_RESULT_NDC: 2208 current_annotation = "NDC"; 2209 emit(MOV(reg, src_reg(output_reg[BRW_VERT_RESULT_NDC]))); 2210 break; 2211 case BRW_VERT_RESULT_HPOS_DUPLICATE: 2212 case VERT_RESULT_HPOS: 2213 current_annotation = "gl_Position"; 2214 emit(MOV(reg, src_reg(output_reg[VERT_RESULT_HPOS]))); 2215 break; 2216 case VERT_RESULT_CLIP_DIST0: 2217 case VERT_RESULT_CLIP_DIST1: 2218 if (this->c->key.uses_clip_distance) { 2219 emit_generic_urb_slot(reg, vert_result); 2220 } else { 2221 current_annotation = "user clip distances"; 2222 emit_clip_distances(hw_reg, (vert_result - VERT_RESULT_CLIP_DIST0) * 4); 2223 } 2224 break; 2225 case BRW_VERT_RESULT_PAD: 2226 /* No need to write to this slot */ 2227 break; 2228 default: 2229 emit_generic_urb_slot(reg, vert_result); 2230 break; 2231 } 2232} 2233 2234static int 2235align_interleaved_urb_mlen(struct brw_context *brw, int mlen) 2236{ 2237 struct intel_context *intel = &brw->intel; 2238 2239 if (intel->gen >= 6) { 2240 /* URB data written (does not include the message header reg) must 2241 * be a multiple of 256 bits, or 2 VS registers. See vol5c.5, 2242 * section 5.4.3.2.2: URB_INTERLEAVED. 2243 * 2244 * URB entries are allocated on a multiple of 1024 bits, so an 2245 * extra 128 bits written here to make the end align to 256 is 2246 * no problem. 2247 */ 2248 if ((mlen % 2) != 1) 2249 mlen++; 2250 } 2251 2252 return mlen; 2253} 2254 2255/** 2256 * Generates the VUE payload plus the 1 or 2 URB write instructions to 2257 * complete the VS thread. 2258 * 2259 * The VUE layout is documented in Volume 2a. 2260 */ 2261void 2262vec4_visitor::emit_urb_writes() 2263{ 2264 /* MRF 0 is reserved for the debugger, so start with message header 2265 * in MRF 1. 2266 */ 2267 int base_mrf = 1; 2268 int mrf = base_mrf; 2269 /* In the process of generating our URB write message contents, we 2270 * may need to unspill a register or load from an array. Those 2271 * reads would use MRFs 14-15. 2272 */ 2273 int max_usable_mrf = 13; 2274 2275 /* The following assertion verifies that max_usable_mrf causes an 2276 * even-numbered amount of URB write data, which will meet gen6's 2277 * requirements for length alignment. 2278 */ 2279 assert ((max_usable_mrf - base_mrf) % 2 == 0); 2280 2281 /* FINISHME: edgeflag */ 2282 2283 /* First mrf is the g0-based message header containing URB handles and such, 2284 * which is implied in VS_OPCODE_URB_WRITE. 2285 */ 2286 mrf++; 2287 2288 if (intel->gen < 6) { 2289 emit_ndc_computation(); 2290 } 2291 2292 /* Set up the VUE data for the first URB write */ 2293 int slot; 2294 for (slot = 0; slot < c->prog_data.vue_map.num_slots; ++slot) { 2295 emit_urb_slot(mrf++, c->prog_data.vue_map.slot_to_vert_result[slot]); 2296 2297 /* If this was max_usable_mrf, we can't fit anything more into this URB 2298 * WRITE. 2299 */ 2300 if (mrf > max_usable_mrf) { 2301 slot++; 2302 break; 2303 } 2304 } 2305 2306 current_annotation = "URB write"; 2307 vec4_instruction *inst = emit(VS_OPCODE_URB_WRITE); 2308 inst->base_mrf = base_mrf; 2309 inst->mlen = align_interleaved_urb_mlen(brw, mrf - base_mrf); 2310 inst->eot = (slot >= c->prog_data.vue_map.num_slots); 2311 2312 /* Optional second URB write */ 2313 if (!inst->eot) { 2314 mrf = base_mrf + 1; 2315 2316 for (; slot < c->prog_data.vue_map.num_slots; ++slot) { 2317 assert(mrf < max_usable_mrf); 2318 2319 emit_urb_slot(mrf++, c->prog_data.vue_map.slot_to_vert_result[slot]); 2320 } 2321 2322 current_annotation = "URB write"; 2323 inst = emit(VS_OPCODE_URB_WRITE); 2324 inst->base_mrf = base_mrf; 2325 inst->mlen = align_interleaved_urb_mlen(brw, mrf - base_mrf); 2326 inst->eot = true; 2327 /* URB destination offset. In the previous write, we got MRFs 2328 * 2-13 minus the one header MRF, so 12 regs. URB offset is in 2329 * URB row increments, and each of our MRFs is half of one of 2330 * those, since we're doing interleaved writes. 2331 */ 2332 inst->offset = (max_usable_mrf - base_mrf) / 2; 2333 } 2334} 2335 2336src_reg 2337vec4_visitor::get_scratch_offset(vec4_instruction *inst, 2338 src_reg *reladdr, int reg_offset) 2339{ 2340 /* Because we store the values to scratch interleaved like our 2341 * vertex data, we need to scale the vec4 index by 2. 2342 */ 2343 int message_header_scale = 2; 2344 2345 /* Pre-gen6, the message header uses byte offsets instead of vec4 2346 * (16-byte) offset units. 2347 */ 2348 if (intel->gen < 6) 2349 message_header_scale *= 16; 2350 2351 if (reladdr) { 2352 src_reg index = src_reg(this, glsl_type::int_type); 2353 2354 emit_before(inst, ADD(dst_reg(index), *reladdr, src_reg(reg_offset))); 2355 emit_before(inst, MUL(dst_reg(index), 2356 index, src_reg(message_header_scale))); 2357 2358 return index; 2359 } else { 2360 return src_reg(reg_offset * message_header_scale); 2361 } 2362} 2363 2364src_reg 2365vec4_visitor::get_pull_constant_offset(vec4_instruction *inst, 2366 src_reg *reladdr, int reg_offset) 2367{ 2368 if (reladdr) { 2369 src_reg index = src_reg(this, glsl_type::int_type); 2370 2371 emit_before(inst, ADD(dst_reg(index), *reladdr, src_reg(reg_offset))); 2372 2373 /* Pre-gen6, the message header uses byte offsets instead of vec4 2374 * (16-byte) offset units. 2375 */ 2376 if (intel->gen < 6) { 2377 emit_before(inst, MUL(dst_reg(index), index, src_reg(16))); 2378 } 2379 2380 return index; 2381 } else { 2382 int message_header_scale = intel->gen < 6 ? 16 : 1; 2383 return src_reg(reg_offset * message_header_scale); 2384 } 2385} 2386 2387/** 2388 * Emits an instruction before @inst to load the value named by @orig_src 2389 * from scratch space at @base_offset to @temp. 2390 */ 2391void 2392vec4_visitor::emit_scratch_read(vec4_instruction *inst, 2393 dst_reg temp, src_reg orig_src, 2394 int base_offset) 2395{ 2396 int reg_offset = base_offset + orig_src.reg_offset; 2397 src_reg index = get_scratch_offset(inst, orig_src.reladdr, reg_offset); 2398 2399 emit_before(inst, SCRATCH_READ(temp, index)); 2400} 2401 2402/** 2403 * Emits an instruction after @inst to store the value to be written 2404 * to @orig_dst to scratch space at @base_offset, from @temp. 2405 */ 2406void 2407vec4_visitor::emit_scratch_write(vec4_instruction *inst, 2408 src_reg temp, dst_reg orig_dst, 2409 int base_offset) 2410{ 2411 int reg_offset = base_offset + orig_dst.reg_offset; 2412 src_reg index = get_scratch_offset(inst, orig_dst.reladdr, reg_offset); 2413 2414 dst_reg dst = dst_reg(brw_writemask(brw_vec8_grf(0, 0), 2415 orig_dst.writemask)); 2416 vec4_instruction *write = SCRATCH_WRITE(dst, temp, index); 2417 write->predicate = inst->predicate; 2418 write->ir = inst->ir; 2419 write->annotation = inst->annotation; 2420 inst->insert_after(write); 2421} 2422 2423/** 2424 * We can't generally support array access in GRF space, because a 2425 * single instruction's destination can only span 2 contiguous 2426 * registers. So, we send all GRF arrays that get variable index 2427 * access to scratch space. 2428 */ 2429void 2430vec4_visitor::move_grf_array_access_to_scratch() 2431{ 2432 int scratch_loc[this->virtual_grf_count]; 2433 2434 for (int i = 0; i < this->virtual_grf_count; i++) { 2435 scratch_loc[i] = -1; 2436 } 2437 2438 /* First, calculate the set of virtual GRFs that need to be punted 2439 * to scratch due to having any array access on them, and where in 2440 * scratch. 2441 */ 2442 foreach_list(node, &this->instructions) { 2443 vec4_instruction *inst = (vec4_instruction *)node; 2444 2445 if (inst->dst.file == GRF && inst->dst.reladdr && 2446 scratch_loc[inst->dst.reg] == -1) { 2447 scratch_loc[inst->dst.reg] = c->last_scratch; 2448 c->last_scratch += this->virtual_grf_sizes[inst->dst.reg] * 8 * 4; 2449 } 2450 2451 for (int i = 0 ; i < 3; i++) { 2452 src_reg *src = &inst->src[i]; 2453 2454 if (src->file == GRF && src->reladdr && 2455 scratch_loc[src->reg] == -1) { 2456 scratch_loc[src->reg] = c->last_scratch; 2457 c->last_scratch += this->virtual_grf_sizes[src->reg] * 8 * 4; 2458 } 2459 } 2460 } 2461 2462 /* Now, for anything that will be accessed through scratch, rewrite 2463 * it to load/store. Note that this is a _safe list walk, because 2464 * we may generate a new scratch_write instruction after the one 2465 * we're processing. 2466 */ 2467 foreach_list_safe(node, &this->instructions) { 2468 vec4_instruction *inst = (vec4_instruction *)node; 2469 2470 /* Set up the annotation tracking for new generated instructions. */ 2471 base_ir = inst->ir; 2472 current_annotation = inst->annotation; 2473 2474 if (inst->dst.file == GRF && scratch_loc[inst->dst.reg] != -1) { 2475 src_reg temp = src_reg(this, glsl_type::vec4_type); 2476 2477 emit_scratch_write(inst, temp, inst->dst, scratch_loc[inst->dst.reg]); 2478 2479 inst->dst.file = temp.file; 2480 inst->dst.reg = temp.reg; 2481 inst->dst.reg_offset = temp.reg_offset; 2482 inst->dst.reladdr = NULL; 2483 } 2484 2485 for (int i = 0 ; i < 3; i++) { 2486 if (inst->src[i].file != GRF || scratch_loc[inst->src[i].reg] == -1) 2487 continue; 2488 2489 dst_reg temp = dst_reg(this, glsl_type::vec4_type); 2490 2491 emit_scratch_read(inst, temp, inst->src[i], 2492 scratch_loc[inst->src[i].reg]); 2493 2494 inst->src[i].file = temp.file; 2495 inst->src[i].reg = temp.reg; 2496 inst->src[i].reg_offset = temp.reg_offset; 2497 inst->src[i].reladdr = NULL; 2498 } 2499 } 2500} 2501 2502/** 2503 * Emits an instruction before @inst to load the value named by @orig_src 2504 * from the pull constant buffer (surface) at @base_offset to @temp. 2505 */ 2506void 2507vec4_visitor::emit_pull_constant_load(vec4_instruction *inst, 2508 dst_reg temp, src_reg orig_src, 2509 int base_offset) 2510{ 2511 int reg_offset = base_offset + orig_src.reg_offset; 2512 src_reg index = src_reg((unsigned)SURF_INDEX_VERT_CONST_BUFFER); 2513 src_reg offset = get_pull_constant_offset(inst, orig_src.reladdr, reg_offset); 2514 vec4_instruction *load; 2515 2516 load = new(mem_ctx) vec4_instruction(this, VS_OPCODE_PULL_CONSTANT_LOAD, 2517 temp, index, offset); 2518 load->base_mrf = 14; 2519 load->mlen = 1; 2520 emit_before(inst, load); 2521} 2522 2523/** 2524 * Implements array access of uniforms by inserting a 2525 * PULL_CONSTANT_LOAD instruction. 2526 * 2527 * Unlike temporary GRF array access (where we don't support it due to 2528 * the difficulty of doing relative addressing on instruction 2529 * destinations), we could potentially do array access of uniforms 2530 * that were loaded in GRF space as push constants. In real-world 2531 * usage we've seen, though, the arrays being used are always larger 2532 * than we could load as push constants, so just always move all 2533 * uniform array access out to a pull constant buffer. 2534 */ 2535void 2536vec4_visitor::move_uniform_array_access_to_pull_constants() 2537{ 2538 int pull_constant_loc[this->uniforms]; 2539 2540 for (int i = 0; i < this->uniforms; i++) { 2541 pull_constant_loc[i] = -1; 2542 } 2543 2544 /* Walk through and find array access of uniforms. Put a copy of that 2545 * uniform in the pull constant buffer. 2546 * 2547 * Note that we don't move constant-indexed accesses to arrays. No 2548 * testing has been done of the performance impact of this choice. 2549 */ 2550 foreach_list_safe(node, &this->instructions) { 2551 vec4_instruction *inst = (vec4_instruction *)node; 2552 2553 for (int i = 0 ; i < 3; i++) { 2554 if (inst->src[i].file != UNIFORM || !inst->src[i].reladdr) 2555 continue; 2556 2557 int uniform = inst->src[i].reg; 2558 2559 /* If this array isn't already present in the pull constant buffer, 2560 * add it. 2561 */ 2562 if (pull_constant_loc[uniform] == -1) { 2563 const float **values = &prog_data->param[uniform * 4]; 2564 2565 pull_constant_loc[uniform] = prog_data->nr_pull_params / 4; 2566 2567 for (int j = 0; j < uniform_size[uniform] * 4; j++) { 2568 prog_data->pull_param[prog_data->nr_pull_params++] = values[j]; 2569 } 2570 } 2571 2572 /* Set up the annotation tracking for new generated instructions. */ 2573 base_ir = inst->ir; 2574 current_annotation = inst->annotation; 2575 2576 dst_reg temp = dst_reg(this, glsl_type::vec4_type); 2577 2578 emit_pull_constant_load(inst, temp, inst->src[i], 2579 pull_constant_loc[uniform]); 2580 2581 inst->src[i].file = temp.file; 2582 inst->src[i].reg = temp.reg; 2583 inst->src[i].reg_offset = temp.reg_offset; 2584 inst->src[i].reladdr = NULL; 2585 } 2586 } 2587 2588 /* Now there are no accesses of the UNIFORM file with a reladdr, so 2589 * no need to track them as larger-than-vec4 objects. This will be 2590 * relied on in cutting out unused uniform vectors from push 2591 * constants. 2592 */ 2593 split_uniform_registers(); 2594} 2595 2596void 2597vec4_visitor::resolve_ud_negate(src_reg *reg) 2598{ 2599 if (reg->type != BRW_REGISTER_TYPE_UD || 2600 !reg->negate) 2601 return; 2602 2603 src_reg temp = src_reg(this, glsl_type::uvec4_type); 2604 emit(BRW_OPCODE_MOV, dst_reg(temp), *reg); 2605 *reg = temp; 2606} 2607 2608vec4_visitor::vec4_visitor(struct brw_vs_compile *c, 2609 struct gl_shader_program *prog, 2610 struct brw_shader *shader) 2611{ 2612 this->c = c; 2613 this->p = &c->func; 2614 this->brw = p->brw; 2615 this->intel = &brw->intel; 2616 this->ctx = &intel->ctx; 2617 this->prog = prog; 2618 this->shader = shader; 2619 2620 this->mem_ctx = ralloc_context(NULL); 2621 this->failed = false; 2622 2623 this->base_ir = NULL; 2624 this->current_annotation = NULL; 2625 2626 this->c = c; 2627 this->vp = (struct gl_vertex_program *) 2628 prog->_LinkedShaders[MESA_SHADER_VERTEX]->Program; 2629 this->prog_data = &c->prog_data; 2630 2631 this->variable_ht = hash_table_ctor(0, 2632 hash_table_pointer_hash, 2633 hash_table_pointer_compare); 2634 2635 this->virtual_grf_def = NULL; 2636 this->virtual_grf_use = NULL; 2637 this->virtual_grf_sizes = NULL; 2638 this->virtual_grf_count = 0; 2639 this->virtual_grf_reg_map = NULL; 2640 this->virtual_grf_reg_count = 0; 2641 this->virtual_grf_array_size = 0; 2642 this->live_intervals_valid = false; 2643 2644 this->max_grf = intel->gen >= 7 ? GEN7_MRF_HACK_START : BRW_MAX_GRF; 2645 2646 this->uniforms = 0; 2647} 2648 2649vec4_visitor::~vec4_visitor() 2650{ 2651 ralloc_free(this->mem_ctx); 2652 hash_table_dtor(this->variable_ht); 2653} 2654 2655 2656void 2657vec4_visitor::fail(const char *format, ...) 2658{ 2659 va_list va; 2660 char *msg; 2661 2662 if (failed) 2663 return; 2664 2665 failed = true; 2666 2667 va_start(va, format); 2668 msg = ralloc_vasprintf(mem_ctx, format, va); 2669 va_end(va); 2670 msg = ralloc_asprintf(mem_ctx, "VS compile failed: %s\n", msg); 2671 2672 this->fail_msg = msg; 2673 2674 if (INTEL_DEBUG & DEBUG_VS) { 2675 fprintf(stderr, "%s", msg); 2676 } 2677} 2678 2679} /* namespace brw */ 2680