brw_fs_visitor.cpp revision 475d70d6ef5feb94efab3923e5607e625f2aee67
1/* 2 * Copyright © 2010 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/** @file brw_fs_visitor.cpp 25 * 26 * This file supports generating the FS LIR from the GLSL IR. The LIR 27 * makes it easier to do backend-specific optimizations than doing so 28 * in the GLSL IR or in the native code. 29 */ 30extern "C" { 31 32#include <sys/types.h> 33 34#include "main/macros.h" 35#include "main/shaderobj.h" 36#include "main/uniforms.h" 37#include "program/prog_parameter.h" 38#include "program/prog_print.h" 39#include "program/prog_optimize.h" 40#include "program/register_allocate.h" 41#include "program/sampler.h" 42#include "program/hash_table.h" 43#include "brw_context.h" 44#include "brw_eu.h" 45#include "brw_wm.h" 46} 47#include "brw_shader.h" 48#include "brw_fs.h" 49#include "glsl/glsl_types.h" 50#include "glsl/ir_optimization.h" 51#include "glsl/ir_print_visitor.h" 52 53void 54fs_visitor::visit(ir_variable *ir) 55{ 56 fs_reg *reg = NULL; 57 58 if (variable_storage(ir)) 59 return; 60 61 if (ir->mode == ir_var_in) { 62 if (!strcmp(ir->name, "gl_FragCoord")) { 63 reg = emit_fragcoord_interpolation(ir); 64 } else if (!strcmp(ir->name, "gl_FrontFacing")) { 65 reg = emit_frontfacing_interpolation(ir); 66 } else { 67 reg = emit_general_interpolation(ir); 68 } 69 assert(reg); 70 hash_table_insert(this->variable_ht, reg, ir); 71 return; 72 } else if (ir->mode == ir_var_out) { 73 reg = new(this->mem_ctx) fs_reg(this, ir->type); 74 75 if (ir->location == FRAG_RESULT_COLOR) { 76 /* Writing gl_FragColor outputs to all color regions. */ 77 for (int i = 0; i < MAX2(c->key.nr_color_regions, 1); i++) { 78 this->outputs[i] = *reg; 79 } 80 } else if (ir->location == FRAG_RESULT_DEPTH) { 81 this->frag_depth = ir; 82 } else { 83 /* gl_FragData or a user-defined FS output */ 84 assert(ir->location >= FRAG_RESULT_DATA0 && 85 ir->location < FRAG_RESULT_DATA0 + BRW_MAX_DRAW_BUFFERS); 86 87 /* General color output. */ 88 for (unsigned int i = 0; i < MAX2(1, ir->type->length); i++) { 89 int output = ir->location - FRAG_RESULT_DATA0 + i; 90 this->outputs[output] = *reg; 91 this->outputs[output].reg_offset += 4 * i; 92 } 93 } 94 } else if (ir->mode == ir_var_uniform) { 95 int param_index = c->prog_data.nr_params; 96 97 if (c->dispatch_width == 16) { 98 if (!variable_storage(ir)) { 99 fail("Failed to find uniform '%s' in 16-wide\n", ir->name); 100 } 101 return; 102 } 103 104 if (!strncmp(ir->name, "gl_", 3)) { 105 setup_builtin_uniform_values(ir); 106 } else { 107 setup_uniform_values(ir->location, ir->type); 108 } 109 110 reg = new(this->mem_ctx) fs_reg(UNIFORM, param_index); 111 reg->type = brw_type_for_base_type(ir->type); 112 } 113 114 if (!reg) 115 reg = new(this->mem_ctx) fs_reg(this, ir->type); 116 117 hash_table_insert(this->variable_ht, reg, ir); 118} 119 120void 121fs_visitor::visit(ir_dereference_variable *ir) 122{ 123 fs_reg *reg = variable_storage(ir->var); 124 this->result = *reg; 125} 126 127void 128fs_visitor::visit(ir_dereference_record *ir) 129{ 130 const glsl_type *struct_type = ir->record->type; 131 132 ir->record->accept(this); 133 134 unsigned int offset = 0; 135 for (unsigned int i = 0; i < struct_type->length; i++) { 136 if (strcmp(struct_type->fields.structure[i].name, ir->field) == 0) 137 break; 138 offset += type_size(struct_type->fields.structure[i].type); 139 } 140 this->result.reg_offset += offset; 141 this->result.type = brw_type_for_base_type(ir->type); 142} 143 144void 145fs_visitor::visit(ir_dereference_array *ir) 146{ 147 ir_constant *index; 148 int element_size; 149 150 ir->array->accept(this); 151 index = ir->array_index->as_constant(); 152 153 element_size = type_size(ir->type); 154 this->result.type = brw_type_for_base_type(ir->type); 155 156 if (index) { 157 assert(this->result.file == UNIFORM || this->result.file == GRF); 158 this->result.reg_offset += index->value.i[0] * element_size; 159 } else { 160 assert(!"FINISHME: non-constant array element"); 161 } 162} 163 164/* Instruction selection: Produce a MOV.sat instead of 165 * MIN(MAX(val, 0), 1) when possible. 166 */ 167bool 168fs_visitor::try_emit_saturate(ir_expression *ir) 169{ 170 ir_rvalue *sat_val = ir->as_rvalue_to_saturate(); 171 172 if (!sat_val) 173 return false; 174 175 sat_val->accept(this); 176 fs_reg src = this->result; 177 178 this->result = fs_reg(this, ir->type); 179 fs_inst *inst = emit(BRW_OPCODE_MOV, this->result, src); 180 inst->saturate = true; 181 182 return true; 183} 184 185void 186fs_visitor::visit(ir_expression *ir) 187{ 188 unsigned int operand; 189 fs_reg op[2], temp; 190 fs_inst *inst; 191 192 assert(ir->get_num_operands() <= 2); 193 194 if (try_emit_saturate(ir)) 195 return; 196 197 for (operand = 0; operand < ir->get_num_operands(); operand++) { 198 ir->operands[operand]->accept(this); 199 if (this->result.file == BAD_FILE) { 200 ir_print_visitor v; 201 fail("Failed to get tree for expression operand:\n"); 202 ir->operands[operand]->accept(&v); 203 } 204 op[operand] = this->result; 205 206 /* Matrix expression operands should have been broken down to vector 207 * operations already. 208 */ 209 assert(!ir->operands[operand]->type->is_matrix()); 210 /* And then those vector operands should have been broken down to scalar. 211 */ 212 assert(!ir->operands[operand]->type->is_vector()); 213 } 214 215 /* Storage for our result. If our result goes into an assignment, it will 216 * just get copy-propagated out, so no worries. 217 */ 218 this->result = fs_reg(this, ir->type); 219 220 switch (ir->operation) { 221 case ir_unop_logic_not: 222 /* Note that BRW_OPCODE_NOT is not appropriate here, since it is 223 * ones complement of the whole register, not just bit 0. 224 */ 225 emit(BRW_OPCODE_XOR, this->result, op[0], fs_reg(1)); 226 break; 227 case ir_unop_neg: 228 op[0].negate = !op[0].negate; 229 this->result = op[0]; 230 break; 231 case ir_unop_abs: 232 op[0].abs = true; 233 op[0].negate = false; 234 this->result = op[0]; 235 break; 236 case ir_unop_sign: 237 temp = fs_reg(this, ir->type); 238 239 emit(BRW_OPCODE_MOV, this->result, fs_reg(0.0f)); 240 241 inst = emit(BRW_OPCODE_CMP, reg_null_f, op[0], fs_reg(0.0f)); 242 inst->conditional_mod = BRW_CONDITIONAL_G; 243 inst = emit(BRW_OPCODE_MOV, this->result, fs_reg(1.0f)); 244 inst->predicated = true; 245 246 inst = emit(BRW_OPCODE_CMP, reg_null_f, op[0], fs_reg(0.0f)); 247 inst->conditional_mod = BRW_CONDITIONAL_L; 248 inst = emit(BRW_OPCODE_MOV, this->result, fs_reg(-1.0f)); 249 inst->predicated = true; 250 251 break; 252 case ir_unop_rcp: 253 emit_math(SHADER_OPCODE_RCP, this->result, op[0]); 254 break; 255 256 case ir_unop_exp2: 257 emit_math(SHADER_OPCODE_EXP2, this->result, op[0]); 258 break; 259 case ir_unop_log2: 260 emit_math(SHADER_OPCODE_LOG2, this->result, op[0]); 261 break; 262 case ir_unop_exp: 263 case ir_unop_log: 264 assert(!"not reached: should be handled by ir_explog_to_explog2"); 265 break; 266 case ir_unop_sin: 267 case ir_unop_sin_reduced: 268 emit_math(SHADER_OPCODE_SIN, this->result, op[0]); 269 break; 270 case ir_unop_cos: 271 case ir_unop_cos_reduced: 272 emit_math(SHADER_OPCODE_COS, this->result, op[0]); 273 break; 274 275 case ir_unop_dFdx: 276 emit(FS_OPCODE_DDX, this->result, op[0]); 277 break; 278 case ir_unop_dFdy: 279 emit(FS_OPCODE_DDY, this->result, op[0]); 280 break; 281 282 case ir_binop_add: 283 emit(BRW_OPCODE_ADD, this->result, op[0], op[1]); 284 break; 285 case ir_binop_sub: 286 assert(!"not reached: should be handled by ir_sub_to_add_neg"); 287 break; 288 289 case ir_binop_mul: 290 if (ir->type->is_integer()) { 291 /* For integer multiplication, the MUL uses the low 16 bits 292 * of one of the operands (src0 on gen6, src1 on gen7). The 293 * MACH accumulates in the contribution of the upper 16 bits 294 * of that operand. 295 * 296 * FINISHME: Emit just the MUL if we know an operand is small 297 * enough. 298 */ 299 struct brw_reg acc = retype(brw_acc_reg(), BRW_REGISTER_TYPE_D); 300 301 emit(BRW_OPCODE_MUL, acc, op[0], op[1]); 302 emit(BRW_OPCODE_MACH, reg_null_d, op[0], op[1]); 303 emit(BRW_OPCODE_MOV, this->result, fs_reg(acc)); 304 } else { 305 emit(BRW_OPCODE_MUL, this->result, op[0], op[1]); 306 } 307 break; 308 case ir_binop_div: 309 /* Floating point should be lowered by DIV_TO_MUL_RCP in the compiler. */ 310 assert(ir->type->is_integer()); 311 emit_math(SHADER_OPCODE_INT_QUOTIENT, this->result, op[0], op[1]); 312 break; 313 case ir_binop_mod: 314 /* Floating point should be lowered by MOD_TO_FRACT in the compiler. */ 315 assert(ir->type->is_integer()); 316 emit_math(SHADER_OPCODE_INT_REMAINDER, this->result, op[0], op[1]); 317 break; 318 319 case ir_binop_less: 320 case ir_binop_greater: 321 case ir_binop_lequal: 322 case ir_binop_gequal: 323 case ir_binop_equal: 324 case ir_binop_all_equal: 325 case ir_binop_nequal: 326 case ir_binop_any_nequal: 327 temp = this->result; 328 /* original gen4 does implicit conversion before comparison. */ 329 if (intel->gen < 5) 330 temp.type = op[0].type; 331 332 resolve_ud_negate(&op[0]); 333 resolve_ud_negate(&op[1]); 334 335 inst = emit(BRW_OPCODE_CMP, temp, op[0], op[1]); 336 inst->conditional_mod = brw_conditional_for_comparison(ir->operation); 337 emit(BRW_OPCODE_AND, this->result, this->result, fs_reg(0x1)); 338 break; 339 340 case ir_binop_logic_xor: 341 emit(BRW_OPCODE_XOR, this->result, op[0], op[1]); 342 break; 343 344 case ir_binop_logic_or: 345 emit(BRW_OPCODE_OR, this->result, op[0], op[1]); 346 break; 347 348 case ir_binop_logic_and: 349 emit(BRW_OPCODE_AND, this->result, op[0], op[1]); 350 break; 351 352 case ir_binop_dot: 353 case ir_unop_any: 354 assert(!"not reached: should be handled by brw_fs_channel_expressions"); 355 break; 356 357 case ir_unop_noise: 358 assert(!"not reached: should be handled by lower_noise"); 359 break; 360 361 case ir_quadop_vector: 362 assert(!"not reached: should be handled by lower_quadop_vector"); 363 break; 364 365 case ir_unop_sqrt: 366 emit_math(SHADER_OPCODE_SQRT, this->result, op[0]); 367 break; 368 369 case ir_unop_rsq: 370 emit_math(SHADER_OPCODE_RSQ, this->result, op[0]); 371 break; 372 373 case ir_unop_i2u: 374 op[0].type = BRW_REGISTER_TYPE_UD; 375 this->result = op[0]; 376 break; 377 case ir_unop_u2i: 378 op[0].type = BRW_REGISTER_TYPE_D; 379 this->result = op[0]; 380 break; 381 case ir_unop_i2f: 382 case ir_unop_u2f: 383 case ir_unop_b2f: 384 case ir_unop_b2i: 385 case ir_unop_f2i: 386 emit(BRW_OPCODE_MOV, this->result, op[0]); 387 break; 388 case ir_unop_f2b: 389 case ir_unop_i2b: 390 temp = this->result; 391 /* original gen4 does implicit conversion before comparison. */ 392 if (intel->gen < 5) 393 temp.type = op[0].type; 394 395 resolve_ud_negate(&op[0]); 396 397 inst = emit(BRW_OPCODE_CMP, temp, op[0], fs_reg(0.0f)); 398 inst->conditional_mod = BRW_CONDITIONAL_NZ; 399 inst = emit(BRW_OPCODE_AND, this->result, this->result, fs_reg(1)); 400 break; 401 402 case ir_unop_trunc: 403 emit(BRW_OPCODE_RNDZ, this->result, op[0]); 404 break; 405 case ir_unop_ceil: 406 op[0].negate = !op[0].negate; 407 inst = emit(BRW_OPCODE_RNDD, this->result, op[0]); 408 this->result.negate = true; 409 break; 410 case ir_unop_floor: 411 inst = emit(BRW_OPCODE_RNDD, this->result, op[0]); 412 break; 413 case ir_unop_fract: 414 inst = emit(BRW_OPCODE_FRC, this->result, op[0]); 415 break; 416 case ir_unop_round_even: 417 emit(BRW_OPCODE_RNDE, this->result, op[0]); 418 break; 419 420 case ir_binop_min: 421 resolve_ud_negate(&op[0]); 422 resolve_ud_negate(&op[1]); 423 424 if (intel->gen >= 6) { 425 inst = emit(BRW_OPCODE_SEL, this->result, op[0], op[1]); 426 inst->conditional_mod = BRW_CONDITIONAL_L; 427 } else { 428 /* Unalias the destination */ 429 this->result = fs_reg(this, ir->type); 430 431 inst = emit(BRW_OPCODE_CMP, this->result, op[0], op[1]); 432 inst->conditional_mod = BRW_CONDITIONAL_L; 433 434 inst = emit(BRW_OPCODE_SEL, this->result, op[0], op[1]); 435 inst->predicated = true; 436 } 437 break; 438 case ir_binop_max: 439 resolve_ud_negate(&op[0]); 440 resolve_ud_negate(&op[1]); 441 442 if (intel->gen >= 6) { 443 inst = emit(BRW_OPCODE_SEL, this->result, op[0], op[1]); 444 inst->conditional_mod = BRW_CONDITIONAL_GE; 445 } else { 446 /* Unalias the destination */ 447 this->result = fs_reg(this, ir->type); 448 449 inst = emit(BRW_OPCODE_CMP, this->result, op[0], op[1]); 450 inst->conditional_mod = BRW_CONDITIONAL_G; 451 452 inst = emit(BRW_OPCODE_SEL, this->result, op[0], op[1]); 453 inst->predicated = true; 454 } 455 break; 456 457 case ir_binop_pow: 458 emit_math(SHADER_OPCODE_POW, this->result, op[0], op[1]); 459 break; 460 461 case ir_unop_bit_not: 462 inst = emit(BRW_OPCODE_NOT, this->result, op[0]); 463 break; 464 case ir_binop_bit_and: 465 inst = emit(BRW_OPCODE_AND, this->result, op[0], op[1]); 466 break; 467 case ir_binop_bit_xor: 468 inst = emit(BRW_OPCODE_XOR, this->result, op[0], op[1]); 469 break; 470 case ir_binop_bit_or: 471 inst = emit(BRW_OPCODE_OR, this->result, op[0], op[1]); 472 break; 473 474 case ir_binop_lshift: 475 inst = emit(BRW_OPCODE_SHL, this->result, op[0], op[1]); 476 break; 477 478 case ir_binop_rshift: 479 if (ir->type->base_type == GLSL_TYPE_INT) 480 inst = emit(BRW_OPCODE_ASR, this->result, op[0], op[1]); 481 else 482 inst = emit(BRW_OPCODE_SHR, this->result, op[0], op[1]); 483 break; 484 } 485} 486 487void 488fs_visitor::emit_assignment_writes(fs_reg &l, fs_reg &r, 489 const glsl_type *type, bool predicated) 490{ 491 switch (type->base_type) { 492 case GLSL_TYPE_FLOAT: 493 case GLSL_TYPE_UINT: 494 case GLSL_TYPE_INT: 495 case GLSL_TYPE_BOOL: 496 for (unsigned int i = 0; i < type->components(); i++) { 497 l.type = brw_type_for_base_type(type); 498 r.type = brw_type_for_base_type(type); 499 500 if (predicated || !l.equals(&r)) { 501 fs_inst *inst = emit(BRW_OPCODE_MOV, l, r); 502 inst->predicated = predicated; 503 } 504 505 l.reg_offset++; 506 r.reg_offset++; 507 } 508 break; 509 case GLSL_TYPE_ARRAY: 510 for (unsigned int i = 0; i < type->length; i++) { 511 emit_assignment_writes(l, r, type->fields.array, predicated); 512 } 513 break; 514 515 case GLSL_TYPE_STRUCT: 516 for (unsigned int i = 0; i < type->length; i++) { 517 emit_assignment_writes(l, r, type->fields.structure[i].type, 518 predicated); 519 } 520 break; 521 522 case GLSL_TYPE_SAMPLER: 523 break; 524 525 default: 526 assert(!"not reached"); 527 break; 528 } 529} 530 531/* If the RHS processing resulted in an instruction generating a 532 * temporary value, and it would be easy to rewrite the instruction to 533 * generate its result right into the LHS instead, do so. This ends 534 * up reliably removing instructions where it can be tricky to do so 535 * later without real UD chain information. 536 */ 537bool 538fs_visitor::try_rewrite_rhs_to_dst(ir_assignment *ir, 539 fs_reg dst, 540 fs_reg src, 541 fs_inst *pre_rhs_inst, 542 fs_inst *last_rhs_inst) 543{ 544 if (pre_rhs_inst == last_rhs_inst) 545 return false; /* No instructions generated to work with. */ 546 547 /* Only attempt if we're doing a direct assignment. */ 548 if (ir->condition || 549 !(ir->lhs->type->is_scalar() || 550 (ir->lhs->type->is_vector() && 551 ir->write_mask == (1 << ir->lhs->type->vector_elements) - 1))) 552 return false; 553 554 /* Make sure the last instruction generated our source reg. */ 555 if (last_rhs_inst->predicated || 556 last_rhs_inst->force_uncompressed || 557 last_rhs_inst->force_sechalf || 558 !src.equals(&last_rhs_inst->dst)) 559 return false; 560 561 /* Success! Rewrite the instruction. */ 562 last_rhs_inst->dst = dst; 563 564 return true; 565} 566 567void 568fs_visitor::visit(ir_assignment *ir) 569{ 570 fs_reg l, r; 571 fs_inst *inst; 572 573 /* FINISHME: arrays on the lhs */ 574 ir->lhs->accept(this); 575 l = this->result; 576 577 fs_inst *pre_rhs_inst = (fs_inst *) this->instructions.get_tail(); 578 579 ir->rhs->accept(this); 580 r = this->result; 581 582 fs_inst *last_rhs_inst = (fs_inst *) this->instructions.get_tail(); 583 584 assert(l.file != BAD_FILE); 585 assert(r.file != BAD_FILE); 586 587 if (try_rewrite_rhs_to_dst(ir, l, r, pre_rhs_inst, last_rhs_inst)) 588 return; 589 590 if (ir->condition) { 591 emit_bool_to_cond_code(ir->condition); 592 } 593 594 if (ir->lhs->type->is_scalar() || 595 ir->lhs->type->is_vector()) { 596 for (int i = 0; i < ir->lhs->type->vector_elements; i++) { 597 if (ir->write_mask & (1 << i)) { 598 inst = emit(BRW_OPCODE_MOV, l, r); 599 if (ir->condition) 600 inst->predicated = true; 601 r.reg_offset++; 602 } 603 l.reg_offset++; 604 } 605 } else { 606 emit_assignment_writes(l, r, ir->lhs->type, ir->condition != NULL); 607 } 608} 609 610fs_inst * 611fs_visitor::emit_texture_gen4(ir_texture *ir, fs_reg dst, fs_reg coordinate, 612 int sampler) 613{ 614 int mlen; 615 int base_mrf = 1; 616 bool simd16 = false; 617 fs_reg orig_dst; 618 619 /* g0 header. */ 620 mlen = 1; 621 622 if (ir->shadow_comparitor && ir->op != ir_txd) { 623 for (int i = 0; i < ir->coordinate->type->vector_elements; i++) { 624 fs_inst *inst = emit(BRW_OPCODE_MOV, 625 fs_reg(MRF, base_mrf + mlen + i), coordinate); 626 if (i < 3 && c->key.gl_clamp_mask[i] & (1 << sampler)) 627 inst->saturate = true; 628 629 coordinate.reg_offset++; 630 } 631 /* gen4's SIMD8 sampler always has the slots for u,v,r present. */ 632 mlen += 3; 633 634 if (ir->op == ir_tex) { 635 /* There's no plain shadow compare message, so we use shadow 636 * compare with a bias of 0.0. 637 */ 638 emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), fs_reg(0.0f)); 639 mlen++; 640 } else if (ir->op == ir_txb) { 641 ir->lod_info.bias->accept(this); 642 emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), this->result); 643 mlen++; 644 } else { 645 assert(ir->op == ir_txl); 646 ir->lod_info.lod->accept(this); 647 emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), this->result); 648 mlen++; 649 } 650 651 ir->shadow_comparitor->accept(this); 652 emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), this->result); 653 mlen++; 654 } else if (ir->op == ir_tex) { 655 for (int i = 0; i < ir->coordinate->type->vector_elements; i++) { 656 fs_inst *inst = emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen + i), 657 coordinate); 658 if (i < 3 && c->key.gl_clamp_mask[i] & (1 << sampler)) 659 inst->saturate = true; 660 coordinate.reg_offset++; 661 } 662 /* gen4's SIMD8 sampler always has the slots for u,v,r present. */ 663 mlen += 3; 664 } else if (ir->op == ir_txd) { 665 ir->lod_info.grad.dPdx->accept(this); 666 fs_reg dPdx = this->result; 667 668 ir->lod_info.grad.dPdy->accept(this); 669 fs_reg dPdy = this->result; 670 671 for (int i = 0; i < ir->coordinate->type->vector_elements; i++) { 672 emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen + i), coordinate); 673 coordinate.reg_offset++; 674 } 675 /* the slots for u and v are always present, but r is optional */ 676 mlen += MAX2(ir->coordinate->type->vector_elements, 2); 677 678 /* P = u, v, r 679 * dPdx = dudx, dvdx, drdx 680 * dPdy = dudy, dvdy, drdy 681 * 682 * 1-arg: Does not exist. 683 * 684 * 2-arg: dudx dvdx dudy dvdy 685 * dPdx.x dPdx.y dPdy.x dPdy.y 686 * m4 m5 m6 m7 687 * 688 * 3-arg: dudx dvdx drdx dudy dvdy drdy 689 * dPdx.x dPdx.y dPdx.z dPdy.x dPdy.y dPdy.z 690 * m5 m6 m7 m8 m9 m10 691 */ 692 for (int i = 0; i < ir->lod_info.grad.dPdx->type->vector_elements; i++) { 693 emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), dPdx); 694 dPdx.reg_offset++; 695 } 696 mlen += MAX2(ir->lod_info.grad.dPdx->type->vector_elements, 2); 697 698 for (int i = 0; i < ir->lod_info.grad.dPdy->type->vector_elements; i++) { 699 emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), dPdy); 700 dPdy.reg_offset++; 701 } 702 mlen += MAX2(ir->lod_info.grad.dPdy->type->vector_elements, 2); 703 } else if (ir->op == ir_txs) { 704 /* There's no SIMD8 resinfo message on Gen4. Use SIMD16 instead. */ 705 simd16 = true; 706 ir->lod_info.lod->accept(this); 707 emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen, BRW_REGISTER_TYPE_UD), this->result); 708 mlen += 2; 709 } else { 710 /* Oh joy. gen4 doesn't have SIMD8 non-shadow-compare bias/lod 711 * instructions. We'll need to do SIMD16 here. 712 */ 713 simd16 = true; 714 assert(ir->op == ir_txb || ir->op == ir_txl || ir->op == ir_txf); 715 716 for (int i = 0; i < ir->coordinate->type->vector_elements; i++) { 717 fs_inst *inst = emit(BRW_OPCODE_MOV, fs_reg(MRF, 718 base_mrf + mlen + i * 2, 719 coordinate.type), 720 coordinate); 721 if (i < 3 && c->key.gl_clamp_mask[i] & (1 << sampler)) 722 inst->saturate = true; 723 coordinate.reg_offset++; 724 } 725 726 /* Initialize the rest of u/v/r with 0.0. Empirically, this seems to 727 * be necessary for TXF (ld), but seems wise to do for all messages. 728 */ 729 for (int i = ir->coordinate->type->vector_elements; i < 3; i++) { 730 emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen + i * 2), fs_reg(0.0f)); 731 } 732 733 /* lod/bias appears after u/v/r. */ 734 mlen += 6; 735 736 if (ir->op == ir_txb) { 737 ir->lod_info.bias->accept(this); 738 emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), this->result); 739 mlen++; 740 } else { 741 ir->lod_info.lod->accept(this); 742 emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen, this->result.type), 743 this->result); 744 mlen++; 745 } 746 747 /* The unused upper half. */ 748 mlen++; 749 } 750 751 if (simd16) { 752 /* Now, since we're doing simd16, the return is 2 interleaved 753 * vec4s where the odd-indexed ones are junk. We'll need to move 754 * this weirdness around to the expected layout. 755 */ 756 orig_dst = dst; 757 const glsl_type *vec_type = 758 glsl_type::get_instance(ir->type->base_type, 4, 1); 759 dst = fs_reg(this, glsl_type::get_array_instance(vec_type, 2)); 760 dst.type = intel->is_g4x ? brw_type_for_base_type(ir->type) 761 : BRW_REGISTER_TYPE_F; 762 } 763 764 fs_inst *inst = NULL; 765 switch (ir->op) { 766 case ir_tex: 767 inst = emit(SHADER_OPCODE_TEX, dst); 768 break; 769 case ir_txb: 770 inst = emit(FS_OPCODE_TXB, dst); 771 break; 772 case ir_txl: 773 inst = emit(SHADER_OPCODE_TXL, dst); 774 break; 775 case ir_txd: 776 inst = emit(SHADER_OPCODE_TXD, dst); 777 break; 778 case ir_txs: 779 inst = emit(SHADER_OPCODE_TXS, dst); 780 break; 781 case ir_txf: 782 inst = emit(SHADER_OPCODE_TXF, dst); 783 break; 784 } 785 inst->base_mrf = base_mrf; 786 inst->mlen = mlen; 787 inst->header_present = true; 788 789 if (simd16) { 790 for (int i = 0; i < 4; i++) { 791 emit(BRW_OPCODE_MOV, orig_dst, dst); 792 orig_dst.reg_offset++; 793 dst.reg_offset += 2; 794 } 795 } 796 797 return inst; 798} 799 800/* gen5's sampler has slots for u, v, r, array index, then optional 801 * parameters like shadow comparitor or LOD bias. If optional 802 * parameters aren't present, those base slots are optional and don't 803 * need to be included in the message. 804 * 805 * We don't fill in the unnecessary slots regardless, which may look 806 * surprising in the disassembly. 807 */ 808fs_inst * 809fs_visitor::emit_texture_gen5(ir_texture *ir, fs_reg dst, fs_reg coordinate, 810 int sampler) 811{ 812 int mlen = 0; 813 int base_mrf = 2; 814 int reg_width = c->dispatch_width / 8; 815 bool header_present = false; 816 const int vector_elements = 817 ir->coordinate ? ir->coordinate->type->vector_elements : 0; 818 819 if (ir->offset) { 820 /* The offsets set up by the ir_texture visitor are in the 821 * m1 header, so we can't go headerless. 822 */ 823 header_present = true; 824 mlen++; 825 base_mrf--; 826 } 827 828 for (int i = 0; i < vector_elements; i++) { 829 fs_inst *inst = emit(BRW_OPCODE_MOV, 830 fs_reg(MRF, base_mrf + mlen + i * reg_width, 831 coordinate.type), 832 coordinate); 833 if (i < 3 && c->key.gl_clamp_mask[i] & (1 << sampler)) 834 inst->saturate = true; 835 coordinate.reg_offset++; 836 } 837 mlen += vector_elements * reg_width; 838 839 if (ir->shadow_comparitor && ir->op != ir_txd) { 840 mlen = MAX2(mlen, header_present + 4 * reg_width); 841 842 ir->shadow_comparitor->accept(this); 843 emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), this->result); 844 mlen += reg_width; 845 } 846 847 fs_inst *inst = NULL; 848 switch (ir->op) { 849 case ir_tex: 850 inst = emit(SHADER_OPCODE_TEX, dst); 851 break; 852 case ir_txb: 853 ir->lod_info.bias->accept(this); 854 mlen = MAX2(mlen, header_present + 4 * reg_width); 855 emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), this->result); 856 mlen += reg_width; 857 858 inst = emit(FS_OPCODE_TXB, dst); 859 860 break; 861 case ir_txl: 862 ir->lod_info.lod->accept(this); 863 mlen = MAX2(mlen, header_present + 4 * reg_width); 864 emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), this->result); 865 mlen += reg_width; 866 867 inst = emit(SHADER_OPCODE_TXL, dst); 868 break; 869 case ir_txd: { 870 ir->lod_info.grad.dPdx->accept(this); 871 fs_reg dPdx = this->result; 872 873 ir->lod_info.grad.dPdy->accept(this); 874 fs_reg dPdy = this->result; 875 876 mlen = MAX2(mlen, header_present + 4 * reg_width); /* skip over 'ai' */ 877 878 /** 879 * P = u, v, r 880 * dPdx = dudx, dvdx, drdx 881 * dPdy = dudy, dvdy, drdy 882 * 883 * Load up these values: 884 * - dudx dudy dvdx dvdy drdx drdy 885 * - dPdx.x dPdy.x dPdx.y dPdy.y dPdx.z dPdy.z 886 */ 887 for (int i = 0; i < ir->lod_info.grad.dPdx->type->vector_elements; i++) { 888 emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), dPdx); 889 dPdx.reg_offset++; 890 mlen += reg_width; 891 892 emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), dPdy); 893 dPdy.reg_offset++; 894 mlen += reg_width; 895 } 896 897 inst = emit(SHADER_OPCODE_TXD, dst); 898 break; 899 } 900 case ir_txs: 901 ir->lod_info.lod->accept(this); 902 emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen, BRW_REGISTER_TYPE_UD), this->result); 903 mlen += reg_width; 904 inst = emit(SHADER_OPCODE_TXS, dst); 905 break; 906 case ir_txf: 907 mlen = header_present + 4 * reg_width; 908 909 ir->lod_info.lod->accept(this); 910 emit(BRW_OPCODE_MOV, 911 fs_reg(MRF, base_mrf + mlen - reg_width, BRW_REGISTER_TYPE_UD), 912 this->result); 913 inst = emit(SHADER_OPCODE_TXF, dst); 914 break; 915 } 916 inst->base_mrf = base_mrf; 917 inst->mlen = mlen; 918 inst->header_present = header_present; 919 920 if (mlen > 11) { 921 fail("Message length >11 disallowed by hardware\n"); 922 } 923 924 return inst; 925} 926 927fs_inst * 928fs_visitor::emit_texture_gen7(ir_texture *ir, fs_reg dst, fs_reg coordinate, 929 int sampler) 930{ 931 int mlen = 0; 932 int base_mrf = 2; 933 int reg_width = c->dispatch_width / 8; 934 bool header_present = false; 935 936 if (ir->offset) { 937 /* The offsets set up by the ir_texture visitor are in the 938 * m1 header, so we can't go headerless. 939 */ 940 header_present = true; 941 mlen++; 942 base_mrf--; 943 } 944 945 if (ir->shadow_comparitor && ir->op != ir_txd) { 946 ir->shadow_comparitor->accept(this); 947 emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), this->result); 948 mlen += reg_width; 949 } 950 951 /* Set up the LOD info */ 952 switch (ir->op) { 953 case ir_tex: 954 break; 955 case ir_txb: 956 ir->lod_info.bias->accept(this); 957 emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), this->result); 958 mlen += reg_width; 959 break; 960 case ir_txl: 961 ir->lod_info.lod->accept(this); 962 emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), this->result); 963 mlen += reg_width; 964 break; 965 case ir_txd: { 966 if (c->dispatch_width == 16) 967 fail("Gen7 does not support sample_d/sample_d_c in SIMD16 mode."); 968 969 ir->lod_info.grad.dPdx->accept(this); 970 fs_reg dPdx = this->result; 971 972 ir->lod_info.grad.dPdy->accept(this); 973 fs_reg dPdy = this->result; 974 975 /* Load dPdx and the coordinate together: 976 * [hdr], [ref], x, dPdx.x, dPdy.x, y, dPdx.y, dPdy.y, z, dPdx.z, dPdy.z 977 */ 978 for (int i = 0; i < ir->coordinate->type->vector_elements; i++) { 979 fs_inst *inst = emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), 980 coordinate); 981 if (i < 3 && c->key.gl_clamp_mask[i] & (1 << sampler)) 982 inst->saturate = true; 983 coordinate.reg_offset++; 984 mlen += reg_width; 985 986 emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), dPdx); 987 dPdx.reg_offset++; 988 mlen += reg_width; 989 990 emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), dPdy); 991 dPdy.reg_offset++; 992 mlen += reg_width; 993 } 994 break; 995 } 996 case ir_txs: 997 ir->lod_info.lod->accept(this); 998 emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen, BRW_REGISTER_TYPE_UD), this->result); 999 mlen += reg_width; 1000 break; 1001 case ir_txf: 1002 /* Unfortunately, the parameters for LD are intermixed: u, lod, v, r. */ 1003 emit(BRW_OPCODE_MOV, 1004 fs_reg(MRF, base_mrf + mlen, BRW_REGISTER_TYPE_D), coordinate); 1005 coordinate.reg_offset++; 1006 mlen += reg_width; 1007 1008 ir->lod_info.lod->accept(this); 1009 emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen, BRW_REGISTER_TYPE_D), this->result); 1010 mlen += reg_width; 1011 1012 for (int i = 1; i < ir->coordinate->type->vector_elements; i++) { 1013 emit(BRW_OPCODE_MOV, 1014 fs_reg(MRF, base_mrf + mlen, BRW_REGISTER_TYPE_D), coordinate); 1015 coordinate.reg_offset++; 1016 mlen += reg_width; 1017 } 1018 break; 1019 } 1020 1021 /* Set up the coordinate (except for cases where it was done above) */ 1022 if (ir->op != ir_txd && ir->op != ir_txs && ir->op != ir_txf) { 1023 for (int i = 0; i < ir->coordinate->type->vector_elements; i++) { 1024 fs_inst *inst = emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), 1025 coordinate); 1026 if (i < 3 && c->key.gl_clamp_mask[i] & (1 << sampler)) 1027 inst->saturate = true; 1028 coordinate.reg_offset++; 1029 mlen += reg_width; 1030 } 1031 } 1032 1033 /* Generate the SEND */ 1034 fs_inst *inst = NULL; 1035 switch (ir->op) { 1036 case ir_tex: inst = emit(SHADER_OPCODE_TEX, dst); break; 1037 case ir_txb: inst = emit(FS_OPCODE_TXB, dst); break; 1038 case ir_txl: inst = emit(SHADER_OPCODE_TXL, dst); break; 1039 case ir_txd: inst = emit(SHADER_OPCODE_TXD, dst); break; 1040 case ir_txf: inst = emit(SHADER_OPCODE_TXF, dst); break; 1041 case ir_txs: inst = emit(SHADER_OPCODE_TXS, dst); break; 1042 } 1043 inst->base_mrf = base_mrf; 1044 inst->mlen = mlen; 1045 inst->header_present = header_present; 1046 1047 if (mlen > 11) { 1048 fail("Message length >11 disallowed by hardware\n"); 1049 } 1050 1051 return inst; 1052} 1053 1054void 1055fs_visitor::visit(ir_texture *ir) 1056{ 1057 fs_inst *inst = NULL; 1058 1059 int sampler = _mesa_get_sampler_uniform_value(ir->sampler, prog, &fp->Base); 1060 sampler = fp->Base.SamplerUnits[sampler]; 1061 1062 /* Our hardware doesn't have a sample_d_c message, so shadow compares 1063 * for textureGrad/TXD need to be emulated with instructions. 1064 */ 1065 bool hw_compare_supported = ir->op != ir_txd; 1066 if (ir->shadow_comparitor && !hw_compare_supported) { 1067 assert(c->key.compare_funcs[sampler] != GL_NONE); 1068 /* No need to even sample for GL_ALWAYS or GL_NEVER...bail early */ 1069 if (c->key.compare_funcs[sampler] == GL_ALWAYS) 1070 return swizzle_result(ir, fs_reg(1.0f), sampler); 1071 else if (c->key.compare_funcs[sampler] == GL_NEVER) 1072 return swizzle_result(ir, fs_reg(0.0f), sampler); 1073 } 1074 1075 if (ir->coordinate) 1076 ir->coordinate->accept(this); 1077 fs_reg coordinate = this->result; 1078 1079 if (ir->offset != NULL) { 1080 uint32_t offset_bits = brw_texture_offset(ir->offset->as_constant()); 1081 1082 /* Explicitly set up the message header by copying g0 to msg reg m1. */ 1083 emit(BRW_OPCODE_MOV, fs_reg(MRF, 1, BRW_REGISTER_TYPE_UD), 1084 fs_reg(retype(brw_vec8_grf(0, 0), BRW_REGISTER_TYPE_UD))); 1085 1086 /* Then set the offset bits in DWord 2 of the message header. */ 1087 emit(BRW_OPCODE_MOV, 1088 fs_reg(retype(brw_vec1_reg(BRW_MESSAGE_REGISTER_FILE, 1, 2), 1089 BRW_REGISTER_TYPE_UD)), 1090 fs_reg(brw_imm_uw(offset_bits))); 1091 } 1092 1093 /* Should be lowered by do_lower_texture_projection */ 1094 assert(!ir->projector); 1095 1096 /* The 965 requires the EU to do the normalization of GL rectangle 1097 * texture coordinates. We use the program parameter state 1098 * tracking to get the scaling factor. 1099 */ 1100 if (intel->gen < 6 && 1101 ir->sampler->type->sampler_dimensionality == GLSL_SAMPLER_DIM_RECT) { 1102 struct gl_program_parameter_list *params = c->fp->program.Base.Parameters; 1103 int tokens[STATE_LENGTH] = { 1104 STATE_INTERNAL, 1105 STATE_TEXRECT_SCALE, 1106 sampler, 1107 0, 1108 0 1109 }; 1110 1111 if (c->dispatch_width == 16) { 1112 fail("rectangle scale uniform setup not supported on 16-wide\n"); 1113 this->result = fs_reg(this, ir->type); 1114 return; 1115 } 1116 1117 c->prog_data.param_convert[c->prog_data.nr_params] = 1118 PARAM_NO_CONVERT; 1119 c->prog_data.param_convert[c->prog_data.nr_params + 1] = 1120 PARAM_NO_CONVERT; 1121 1122 fs_reg scale_x = fs_reg(UNIFORM, c->prog_data.nr_params); 1123 fs_reg scale_y = fs_reg(UNIFORM, c->prog_data.nr_params + 1); 1124 GLuint index = _mesa_add_state_reference(params, 1125 (gl_state_index *)tokens); 1126 1127 this->param_index[c->prog_data.nr_params] = index; 1128 this->param_offset[c->prog_data.nr_params] = 0; 1129 c->prog_data.nr_params++; 1130 this->param_index[c->prog_data.nr_params] = index; 1131 this->param_offset[c->prog_data.nr_params] = 1; 1132 c->prog_data.nr_params++; 1133 1134 fs_reg dst = fs_reg(this, ir->coordinate->type); 1135 fs_reg src = coordinate; 1136 coordinate = dst; 1137 1138 emit(BRW_OPCODE_MUL, dst, src, scale_x); 1139 dst.reg_offset++; 1140 src.reg_offset++; 1141 emit(BRW_OPCODE_MUL, dst, src, scale_y); 1142 } 1143 1144 /* Writemasking doesn't eliminate channels on SIMD8 texture 1145 * samples, so don't worry about them. 1146 */ 1147 fs_reg dst = fs_reg(this, glsl_type::get_instance(ir->type->base_type, 4, 1)); 1148 1149 if (intel->gen >= 7) { 1150 inst = emit_texture_gen7(ir, dst, coordinate, sampler); 1151 } else if (intel->gen >= 5) { 1152 inst = emit_texture_gen5(ir, dst, coordinate, sampler); 1153 } else { 1154 inst = emit_texture_gen4(ir, dst, coordinate, sampler); 1155 } 1156 1157 /* If there's an offset, we already set up m1. To avoid the implied move, 1158 * use the null register. Otherwise, we want an implied move from g0. 1159 */ 1160 if (ir->offset != NULL || !inst->header_present) 1161 inst->src[0] = reg_undef; 1162 else 1163 inst->src[0] = fs_reg(retype(brw_vec8_grf(0, 0), BRW_REGISTER_TYPE_UW)); 1164 1165 inst->sampler = sampler; 1166 1167 if (ir->shadow_comparitor) { 1168 if (hw_compare_supported) { 1169 inst->shadow_compare = true; 1170 } else { 1171 ir->shadow_comparitor->accept(this); 1172 fs_reg ref = this->result; 1173 1174 fs_reg value = dst; 1175 dst = fs_reg(this, glsl_type::vec4_type); 1176 1177 /* FINISHME: This needs to be done pre-filtering. */ 1178 1179 uint32_t conditional = 0; 1180 switch (c->key.compare_funcs[sampler]) { 1181 /* GL_ALWAYS and GL_NEVER were handled at the top of the function */ 1182 case GL_LESS: conditional = BRW_CONDITIONAL_L; break; 1183 case GL_GREATER: conditional = BRW_CONDITIONAL_G; break; 1184 case GL_LEQUAL: conditional = BRW_CONDITIONAL_LE; break; 1185 case GL_GEQUAL: conditional = BRW_CONDITIONAL_GE; break; 1186 case GL_EQUAL: conditional = BRW_CONDITIONAL_EQ; break; 1187 case GL_NOTEQUAL: conditional = BRW_CONDITIONAL_NEQ; break; 1188 default: assert(!"Should not get here: bad shadow compare function"); 1189 } 1190 1191 /* Use conditional moves to load 0 or 1 as the result */ 1192 this->current_annotation = "manual shadow comparison"; 1193 for (int i = 0; i < 4; i++) { 1194 inst = emit(BRW_OPCODE_MOV, dst, fs_reg(0.0f)); 1195 1196 inst = emit(BRW_OPCODE_CMP, reg_null_f, ref, value); 1197 inst->conditional_mod = conditional; 1198 1199 inst = emit(BRW_OPCODE_MOV, dst, fs_reg(1.0f)); 1200 inst->predicated = true; 1201 1202 dst.reg_offset++; 1203 value.reg_offset++; 1204 } 1205 dst.reg_offset = 0; 1206 } 1207 } 1208 1209 swizzle_result(ir, dst, sampler); 1210} 1211 1212/** 1213 * Swizzle the result of a texture result. This is necessary for 1214 * EXT_texture_swizzle as well as DEPTH_TEXTURE_MODE for shadow comparisons. 1215 */ 1216void 1217fs_visitor::swizzle_result(ir_texture *ir, fs_reg orig_val, int sampler) 1218{ 1219 this->result = orig_val; 1220 1221 if (ir->op == ir_txs) 1222 return; 1223 1224 if (ir->type == glsl_type::float_type) { 1225 /* Ignore DEPTH_TEXTURE_MODE swizzling. */ 1226 assert(ir->sampler->type->sampler_shadow); 1227 } else if (c->key.tex_swizzles[sampler] != SWIZZLE_NOOP) { 1228 fs_reg swizzled_result = fs_reg(this, glsl_type::vec4_type); 1229 1230 for (int i = 0; i < 4; i++) { 1231 int swiz = GET_SWZ(c->key.tex_swizzles[sampler], i); 1232 fs_reg l = swizzled_result; 1233 l.reg_offset += i; 1234 1235 if (swiz == SWIZZLE_ZERO) { 1236 emit(BRW_OPCODE_MOV, l, fs_reg(0.0f)); 1237 } else if (swiz == SWIZZLE_ONE) { 1238 emit(BRW_OPCODE_MOV, l, fs_reg(1.0f)); 1239 } else { 1240 fs_reg r = orig_val; 1241 r.reg_offset += GET_SWZ(c->key.tex_swizzles[sampler], i); 1242 emit(BRW_OPCODE_MOV, l, r); 1243 } 1244 } 1245 this->result = swizzled_result; 1246 } 1247} 1248 1249void 1250fs_visitor::visit(ir_swizzle *ir) 1251{ 1252 ir->val->accept(this); 1253 fs_reg val = this->result; 1254 1255 if (ir->type->vector_elements == 1) { 1256 this->result.reg_offset += ir->mask.x; 1257 return; 1258 } 1259 1260 fs_reg result = fs_reg(this, ir->type); 1261 this->result = result; 1262 1263 for (unsigned int i = 0; i < ir->type->vector_elements; i++) { 1264 fs_reg channel = val; 1265 int swiz = 0; 1266 1267 switch (i) { 1268 case 0: 1269 swiz = ir->mask.x; 1270 break; 1271 case 1: 1272 swiz = ir->mask.y; 1273 break; 1274 case 2: 1275 swiz = ir->mask.z; 1276 break; 1277 case 3: 1278 swiz = ir->mask.w; 1279 break; 1280 } 1281 1282 channel.reg_offset += swiz; 1283 emit(BRW_OPCODE_MOV, result, channel); 1284 result.reg_offset++; 1285 } 1286} 1287 1288void 1289fs_visitor::visit(ir_discard *ir) 1290{ 1291 assert(ir->condition == NULL); /* FINISHME */ 1292 1293 emit(FS_OPCODE_DISCARD); 1294 kill_emitted = true; 1295} 1296 1297void 1298fs_visitor::visit(ir_constant *ir) 1299{ 1300 /* Set this->result to reg at the bottom of the function because some code 1301 * paths will cause this visitor to be applied to other fields. This will 1302 * cause the value stored in this->result to be modified. 1303 * 1304 * Make reg constant so that it doesn't get accidentally modified along the 1305 * way. Yes, I actually had this problem. :( 1306 */ 1307 const fs_reg reg(this, ir->type); 1308 fs_reg dst_reg = reg; 1309 1310 if (ir->type->is_array()) { 1311 const unsigned size = type_size(ir->type->fields.array); 1312 1313 for (unsigned i = 0; i < ir->type->length; i++) { 1314 ir->array_elements[i]->accept(this); 1315 fs_reg src_reg = this->result; 1316 1317 dst_reg.type = src_reg.type; 1318 for (unsigned j = 0; j < size; j++) { 1319 emit(BRW_OPCODE_MOV, dst_reg, src_reg); 1320 src_reg.reg_offset++; 1321 dst_reg.reg_offset++; 1322 } 1323 } 1324 } else if (ir->type->is_record()) { 1325 foreach_list(node, &ir->components) { 1326 ir_instruction *const field = (ir_instruction *) node; 1327 const unsigned size = type_size(field->type); 1328 1329 field->accept(this); 1330 fs_reg src_reg = this->result; 1331 1332 dst_reg.type = src_reg.type; 1333 for (unsigned j = 0; j < size; j++) { 1334 emit(BRW_OPCODE_MOV, dst_reg, src_reg); 1335 src_reg.reg_offset++; 1336 dst_reg.reg_offset++; 1337 } 1338 } 1339 } else { 1340 const unsigned size = type_size(ir->type); 1341 1342 for (unsigned i = 0; i < size; i++) { 1343 switch (ir->type->base_type) { 1344 case GLSL_TYPE_FLOAT: 1345 emit(BRW_OPCODE_MOV, dst_reg, fs_reg(ir->value.f[i])); 1346 break; 1347 case GLSL_TYPE_UINT: 1348 emit(BRW_OPCODE_MOV, dst_reg, fs_reg(ir->value.u[i])); 1349 break; 1350 case GLSL_TYPE_INT: 1351 emit(BRW_OPCODE_MOV, dst_reg, fs_reg(ir->value.i[i])); 1352 break; 1353 case GLSL_TYPE_BOOL: 1354 emit(BRW_OPCODE_MOV, dst_reg, fs_reg((int)ir->value.b[i])); 1355 break; 1356 default: 1357 assert(!"Non-float/uint/int/bool constant"); 1358 } 1359 dst_reg.reg_offset++; 1360 } 1361 } 1362 1363 this->result = reg; 1364} 1365 1366void 1367fs_visitor::emit_bool_to_cond_code(ir_rvalue *ir) 1368{ 1369 ir_expression *expr = ir->as_expression(); 1370 1371 if (expr) { 1372 fs_reg op[2]; 1373 fs_inst *inst; 1374 1375 assert(expr->get_num_operands() <= 2); 1376 for (unsigned int i = 0; i < expr->get_num_operands(); i++) { 1377 assert(expr->operands[i]->type->is_scalar()); 1378 1379 expr->operands[i]->accept(this); 1380 op[i] = this->result; 1381 1382 resolve_ud_negate(&op[i]); 1383 } 1384 1385 switch (expr->operation) { 1386 case ir_unop_logic_not: 1387 inst = emit(BRW_OPCODE_AND, reg_null_d, op[0], fs_reg(1)); 1388 inst->conditional_mod = BRW_CONDITIONAL_Z; 1389 break; 1390 1391 case ir_binop_logic_xor: 1392 inst = emit(BRW_OPCODE_XOR, reg_null_d, op[0], op[1]); 1393 inst->conditional_mod = BRW_CONDITIONAL_NZ; 1394 break; 1395 1396 case ir_binop_logic_or: 1397 inst = emit(BRW_OPCODE_OR, reg_null_d, op[0], op[1]); 1398 inst->conditional_mod = BRW_CONDITIONAL_NZ; 1399 break; 1400 1401 case ir_binop_logic_and: 1402 inst = emit(BRW_OPCODE_AND, reg_null_d, op[0], op[1]); 1403 inst->conditional_mod = BRW_CONDITIONAL_NZ; 1404 break; 1405 1406 case ir_unop_f2b: 1407 if (intel->gen >= 6) { 1408 inst = emit(BRW_OPCODE_CMP, reg_null_d, op[0], fs_reg(0.0f)); 1409 } else { 1410 inst = emit(BRW_OPCODE_MOV, reg_null_f, op[0]); 1411 } 1412 inst->conditional_mod = BRW_CONDITIONAL_NZ; 1413 break; 1414 1415 case ir_unop_i2b: 1416 if (intel->gen >= 6) { 1417 inst = emit(BRW_OPCODE_CMP, reg_null_d, op[0], fs_reg(0)); 1418 } else { 1419 inst = emit(BRW_OPCODE_MOV, reg_null_d, op[0]); 1420 } 1421 inst->conditional_mod = BRW_CONDITIONAL_NZ; 1422 break; 1423 1424 case ir_binop_greater: 1425 case ir_binop_gequal: 1426 case ir_binop_less: 1427 case ir_binop_lequal: 1428 case ir_binop_equal: 1429 case ir_binop_all_equal: 1430 case ir_binop_nequal: 1431 case ir_binop_any_nequal: 1432 inst = emit(BRW_OPCODE_CMP, reg_null_cmp, op[0], op[1]); 1433 inst->conditional_mod = 1434 brw_conditional_for_comparison(expr->operation); 1435 break; 1436 1437 default: 1438 assert(!"not reached"); 1439 fail("bad cond code\n"); 1440 break; 1441 } 1442 return; 1443 } 1444 1445 ir->accept(this); 1446 1447 if (intel->gen >= 6) { 1448 fs_inst *inst = emit(BRW_OPCODE_AND, reg_null_d, this->result, fs_reg(1)); 1449 inst->conditional_mod = BRW_CONDITIONAL_NZ; 1450 } else { 1451 fs_inst *inst = emit(BRW_OPCODE_MOV, reg_null_d, this->result); 1452 inst->conditional_mod = BRW_CONDITIONAL_NZ; 1453 } 1454} 1455 1456/** 1457 * Emit a gen6 IF statement with the comparison folded into the IF 1458 * instruction. 1459 */ 1460void 1461fs_visitor::emit_if_gen6(ir_if *ir) 1462{ 1463 ir_expression *expr = ir->condition->as_expression(); 1464 1465 if (expr) { 1466 fs_reg op[2]; 1467 fs_inst *inst; 1468 fs_reg temp; 1469 1470 assert(expr->get_num_operands() <= 2); 1471 for (unsigned int i = 0; i < expr->get_num_operands(); i++) { 1472 assert(expr->operands[i]->type->is_scalar()); 1473 1474 expr->operands[i]->accept(this); 1475 op[i] = this->result; 1476 } 1477 1478 switch (expr->operation) { 1479 case ir_unop_logic_not: 1480 inst = emit(BRW_OPCODE_IF, temp, op[0], fs_reg(0)); 1481 inst->conditional_mod = BRW_CONDITIONAL_Z; 1482 return; 1483 1484 case ir_binop_logic_xor: 1485 inst = emit(BRW_OPCODE_IF, reg_null_d, op[0], op[1]); 1486 inst->conditional_mod = BRW_CONDITIONAL_NZ; 1487 return; 1488 1489 case ir_binop_logic_or: 1490 temp = fs_reg(this, glsl_type::bool_type); 1491 emit(BRW_OPCODE_OR, temp, op[0], op[1]); 1492 inst = emit(BRW_OPCODE_IF, reg_null_d, temp, fs_reg(0)); 1493 inst->conditional_mod = BRW_CONDITIONAL_NZ; 1494 return; 1495 1496 case ir_binop_logic_and: 1497 temp = fs_reg(this, glsl_type::bool_type); 1498 emit(BRW_OPCODE_AND, temp, op[0], op[1]); 1499 inst = emit(BRW_OPCODE_IF, reg_null_d, temp, fs_reg(0)); 1500 inst->conditional_mod = BRW_CONDITIONAL_NZ; 1501 return; 1502 1503 case ir_unop_f2b: 1504 inst = emit(BRW_OPCODE_IF, reg_null_f, op[0], fs_reg(0)); 1505 inst->conditional_mod = BRW_CONDITIONAL_NZ; 1506 return; 1507 1508 case ir_unop_i2b: 1509 inst = emit(BRW_OPCODE_IF, reg_null_d, op[0], fs_reg(0)); 1510 inst->conditional_mod = BRW_CONDITIONAL_NZ; 1511 return; 1512 1513 case ir_binop_greater: 1514 case ir_binop_gequal: 1515 case ir_binop_less: 1516 case ir_binop_lequal: 1517 case ir_binop_equal: 1518 case ir_binop_all_equal: 1519 case ir_binop_nequal: 1520 case ir_binop_any_nequal: 1521 inst = emit(BRW_OPCODE_IF, reg_null_d, op[0], op[1]); 1522 inst->conditional_mod = 1523 brw_conditional_for_comparison(expr->operation); 1524 return; 1525 default: 1526 assert(!"not reached"); 1527 inst = emit(BRW_OPCODE_IF, reg_null_d, op[0], fs_reg(0)); 1528 inst->conditional_mod = BRW_CONDITIONAL_NZ; 1529 fail("bad condition\n"); 1530 return; 1531 } 1532 return; 1533 } 1534 1535 ir->condition->accept(this); 1536 1537 fs_inst *inst = emit(BRW_OPCODE_IF, reg_null_d, this->result, fs_reg(0)); 1538 inst->conditional_mod = BRW_CONDITIONAL_NZ; 1539} 1540 1541void 1542fs_visitor::visit(ir_if *ir) 1543{ 1544 fs_inst *inst; 1545 1546 if (intel->gen < 6 && c->dispatch_width == 16) { 1547 fail("Can't support (non-uniform) control flow on 16-wide\n"); 1548 } 1549 1550 /* Don't point the annotation at the if statement, because then it plus 1551 * the then and else blocks get printed. 1552 */ 1553 this->base_ir = ir->condition; 1554 1555 if (intel->gen == 6) { 1556 emit_if_gen6(ir); 1557 } else { 1558 emit_bool_to_cond_code(ir->condition); 1559 1560 inst = emit(BRW_OPCODE_IF); 1561 inst->predicated = true; 1562 } 1563 1564 foreach_list(node, &ir->then_instructions) { 1565 ir_instruction *ir = (ir_instruction *)node; 1566 this->base_ir = ir; 1567 1568 ir->accept(this); 1569 } 1570 1571 if (!ir->else_instructions.is_empty()) { 1572 emit(BRW_OPCODE_ELSE); 1573 1574 foreach_list(node, &ir->else_instructions) { 1575 ir_instruction *ir = (ir_instruction *)node; 1576 this->base_ir = ir; 1577 1578 ir->accept(this); 1579 } 1580 } 1581 1582 emit(BRW_OPCODE_ENDIF); 1583} 1584 1585void 1586fs_visitor::visit(ir_loop *ir) 1587{ 1588 fs_reg counter = reg_undef; 1589 1590 if (c->dispatch_width == 16) { 1591 fail("Can't support (non-uniform) control flow on 16-wide\n"); 1592 } 1593 1594 if (ir->counter) { 1595 this->base_ir = ir->counter; 1596 ir->counter->accept(this); 1597 counter = *(variable_storage(ir->counter)); 1598 1599 if (ir->from) { 1600 this->base_ir = ir->from; 1601 ir->from->accept(this); 1602 1603 emit(BRW_OPCODE_MOV, counter, this->result); 1604 } 1605 } 1606 1607 emit(BRW_OPCODE_DO); 1608 1609 if (ir->to) { 1610 this->base_ir = ir->to; 1611 ir->to->accept(this); 1612 1613 fs_inst *inst = emit(BRW_OPCODE_CMP, reg_null_cmp, counter, this->result); 1614 inst->conditional_mod = brw_conditional_for_comparison(ir->cmp); 1615 1616 inst = emit(BRW_OPCODE_BREAK); 1617 inst->predicated = true; 1618 } 1619 1620 foreach_list(node, &ir->body_instructions) { 1621 ir_instruction *ir = (ir_instruction *)node; 1622 1623 this->base_ir = ir; 1624 ir->accept(this); 1625 } 1626 1627 if (ir->increment) { 1628 this->base_ir = ir->increment; 1629 ir->increment->accept(this); 1630 emit(BRW_OPCODE_ADD, counter, counter, this->result); 1631 } 1632 1633 emit(BRW_OPCODE_WHILE); 1634} 1635 1636void 1637fs_visitor::visit(ir_loop_jump *ir) 1638{ 1639 switch (ir->mode) { 1640 case ir_loop_jump::jump_break: 1641 emit(BRW_OPCODE_BREAK); 1642 break; 1643 case ir_loop_jump::jump_continue: 1644 emit(BRW_OPCODE_CONTINUE); 1645 break; 1646 } 1647} 1648 1649void 1650fs_visitor::visit(ir_call *ir) 1651{ 1652 assert(!"FINISHME"); 1653} 1654 1655void 1656fs_visitor::visit(ir_return *ir) 1657{ 1658 assert(!"FINISHME"); 1659} 1660 1661void 1662fs_visitor::visit(ir_function *ir) 1663{ 1664 /* Ignore function bodies other than main() -- we shouldn't see calls to 1665 * them since they should all be inlined before we get to ir_to_mesa. 1666 */ 1667 if (strcmp(ir->name, "main") == 0) { 1668 const ir_function_signature *sig; 1669 exec_list empty; 1670 1671 sig = ir->matching_signature(&empty); 1672 1673 assert(sig); 1674 1675 foreach_list(node, &sig->body) { 1676 ir_instruction *ir = (ir_instruction *)node; 1677 this->base_ir = ir; 1678 1679 ir->accept(this); 1680 } 1681 } 1682} 1683 1684void 1685fs_visitor::visit(ir_function_signature *ir) 1686{ 1687 assert(!"not reached"); 1688 (void)ir; 1689} 1690 1691fs_inst * 1692fs_visitor::emit(fs_inst inst) 1693{ 1694 fs_inst *list_inst = new(mem_ctx) fs_inst; 1695 *list_inst = inst; 1696 1697 if (force_uncompressed_stack > 0) 1698 list_inst->force_uncompressed = true; 1699 else if (force_sechalf_stack > 0) 1700 list_inst->force_sechalf = true; 1701 1702 list_inst->annotation = this->current_annotation; 1703 list_inst->ir = this->base_ir; 1704 1705 this->instructions.push_tail(list_inst); 1706 1707 return list_inst; 1708} 1709 1710/** Emits a dummy fragment shader consisting of magenta for bringup purposes. */ 1711void 1712fs_visitor::emit_dummy_fs() 1713{ 1714 /* Everyone's favorite color. */ 1715 emit(BRW_OPCODE_MOV, fs_reg(MRF, 2), fs_reg(1.0f)); 1716 emit(BRW_OPCODE_MOV, fs_reg(MRF, 3), fs_reg(0.0f)); 1717 emit(BRW_OPCODE_MOV, fs_reg(MRF, 4), fs_reg(1.0f)); 1718 emit(BRW_OPCODE_MOV, fs_reg(MRF, 5), fs_reg(0.0f)); 1719 1720 fs_inst *write; 1721 write = emit(FS_OPCODE_FB_WRITE, fs_reg(0), fs_reg(0)); 1722 write->base_mrf = 2; 1723} 1724 1725/* The register location here is relative to the start of the URB 1726 * data. It will get adjusted to be a real location before 1727 * generate_code() time. 1728 */ 1729struct brw_reg 1730fs_visitor::interp_reg(int location, int channel) 1731{ 1732 int regnr = urb_setup[location] * 2 + channel / 2; 1733 int stride = (channel & 1) * 4; 1734 1735 assert(urb_setup[location] != -1); 1736 1737 return brw_vec1_grf(regnr, stride); 1738} 1739 1740/** Emits the interpolation for the varying inputs. */ 1741void 1742fs_visitor::emit_interpolation_setup_gen4() 1743{ 1744 this->current_annotation = "compute pixel centers"; 1745 this->pixel_x = fs_reg(this, glsl_type::uint_type); 1746 this->pixel_y = fs_reg(this, glsl_type::uint_type); 1747 this->pixel_x.type = BRW_REGISTER_TYPE_UW; 1748 this->pixel_y.type = BRW_REGISTER_TYPE_UW; 1749 1750 emit(FS_OPCODE_PIXEL_X, this->pixel_x); 1751 emit(FS_OPCODE_PIXEL_Y, this->pixel_y); 1752 1753 this->current_annotation = "compute pixel deltas from v0"; 1754 if (brw->has_pln) { 1755 this->delta_x[BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC] = 1756 fs_reg(this, glsl_type::vec2_type); 1757 this->delta_y[BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC] = 1758 this->delta_x[BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC]; 1759 this->delta_y[BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC].reg_offset++; 1760 } else { 1761 this->delta_x[BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC] = 1762 fs_reg(this, glsl_type::float_type); 1763 this->delta_y[BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC] = 1764 fs_reg(this, glsl_type::float_type); 1765 } 1766 emit(BRW_OPCODE_ADD, this->delta_x[BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC], 1767 this->pixel_x, fs_reg(negate(brw_vec1_grf(1, 0)))); 1768 emit(BRW_OPCODE_ADD, this->delta_y[BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC], 1769 this->pixel_y, fs_reg(negate(brw_vec1_grf(1, 1)))); 1770 1771 this->current_annotation = "compute pos.w and 1/pos.w"; 1772 /* Compute wpos.w. It's always in our setup, since it's needed to 1773 * interpolate the other attributes. 1774 */ 1775 this->wpos_w = fs_reg(this, glsl_type::float_type); 1776 emit(FS_OPCODE_LINTERP, wpos_w, 1777 this->delta_x[BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC], 1778 this->delta_y[BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC], 1779 interp_reg(FRAG_ATTRIB_WPOS, 3)); 1780 /* Compute the pixel 1/W value from wpos.w. */ 1781 this->pixel_w = fs_reg(this, glsl_type::float_type); 1782 emit_math(SHADER_OPCODE_RCP, this->pixel_w, wpos_w); 1783 this->current_annotation = NULL; 1784} 1785 1786/** Emits the interpolation for the varying inputs. */ 1787void 1788fs_visitor::emit_interpolation_setup_gen6() 1789{ 1790 struct brw_reg g1_uw = retype(brw_vec1_grf(1, 0), BRW_REGISTER_TYPE_UW); 1791 1792 /* If the pixel centers end up used, the setup is the same as for gen4. */ 1793 this->current_annotation = "compute pixel centers"; 1794 fs_reg int_pixel_x = fs_reg(this, glsl_type::uint_type); 1795 fs_reg int_pixel_y = fs_reg(this, glsl_type::uint_type); 1796 int_pixel_x.type = BRW_REGISTER_TYPE_UW; 1797 int_pixel_y.type = BRW_REGISTER_TYPE_UW; 1798 emit(BRW_OPCODE_ADD, 1799 int_pixel_x, 1800 fs_reg(stride(suboffset(g1_uw, 4), 2, 4, 0)), 1801 fs_reg(brw_imm_v(0x10101010))); 1802 emit(BRW_OPCODE_ADD, 1803 int_pixel_y, 1804 fs_reg(stride(suboffset(g1_uw, 5), 2, 4, 0)), 1805 fs_reg(brw_imm_v(0x11001100))); 1806 1807 /* As of gen6, we can no longer mix float and int sources. We have 1808 * to turn the integer pixel centers into floats for their actual 1809 * use. 1810 */ 1811 this->pixel_x = fs_reg(this, glsl_type::float_type); 1812 this->pixel_y = fs_reg(this, glsl_type::float_type); 1813 emit(BRW_OPCODE_MOV, this->pixel_x, int_pixel_x); 1814 emit(BRW_OPCODE_MOV, this->pixel_y, int_pixel_y); 1815 1816 this->current_annotation = "compute pos.w"; 1817 this->pixel_w = fs_reg(brw_vec8_grf(c->source_w_reg, 0)); 1818 this->wpos_w = fs_reg(this, glsl_type::float_type); 1819 emit_math(SHADER_OPCODE_RCP, this->wpos_w, this->pixel_w); 1820 1821 for (int i = 0; i < BRW_WM_BARYCENTRIC_INTERP_MODE_COUNT; ++i) { 1822 uint8_t reg = c->barycentric_coord_reg[i]; 1823 this->delta_x[i] = fs_reg(brw_vec8_grf(reg, 0)); 1824 this->delta_y[i] = fs_reg(brw_vec8_grf(reg + 1, 0)); 1825 } 1826 1827 this->current_annotation = NULL; 1828} 1829 1830void 1831fs_visitor::emit_color_write(int target, int index, int first_color_mrf) 1832{ 1833 int reg_width = c->dispatch_width / 8; 1834 fs_inst *inst; 1835 fs_reg color = outputs[target]; 1836 fs_reg mrf; 1837 1838 /* If there's no color data to be written, skip it. */ 1839 if (color.file == BAD_FILE) 1840 return; 1841 1842 color.reg_offset += index; 1843 1844 if (c->dispatch_width == 8 || intel->gen >= 6) { 1845 /* SIMD8 write looks like: 1846 * m + 0: r0 1847 * m + 1: r1 1848 * m + 2: g0 1849 * m + 3: g1 1850 * 1851 * gen6 SIMD16 DP write looks like: 1852 * m + 0: r0 1853 * m + 1: r1 1854 * m + 2: g0 1855 * m + 3: g1 1856 * m + 4: b0 1857 * m + 5: b1 1858 * m + 6: a0 1859 * m + 7: a1 1860 */ 1861 inst = emit(BRW_OPCODE_MOV, 1862 fs_reg(MRF, first_color_mrf + index * reg_width, color.type), 1863 color); 1864 inst->saturate = c->key.clamp_fragment_color; 1865 } else { 1866 /* pre-gen6 SIMD16 single source DP write looks like: 1867 * m + 0: r0 1868 * m + 1: g0 1869 * m + 2: b0 1870 * m + 3: a0 1871 * m + 4: r1 1872 * m + 5: g1 1873 * m + 6: b1 1874 * m + 7: a1 1875 */ 1876 if (brw->has_compr4) { 1877 /* By setting the high bit of the MRF register number, we 1878 * indicate that we want COMPR4 mode - instead of doing the 1879 * usual destination + 1 for the second half we get 1880 * destination + 4. 1881 */ 1882 inst = emit(BRW_OPCODE_MOV, 1883 fs_reg(MRF, BRW_MRF_COMPR4 + first_color_mrf + index, 1884 color.type), 1885 color); 1886 inst->saturate = c->key.clamp_fragment_color; 1887 } else { 1888 push_force_uncompressed(); 1889 inst = emit(BRW_OPCODE_MOV, fs_reg(MRF, first_color_mrf + index, 1890 color.type), 1891 color); 1892 inst->saturate = c->key.clamp_fragment_color; 1893 pop_force_uncompressed(); 1894 1895 push_force_sechalf(); 1896 color.sechalf = true; 1897 inst = emit(BRW_OPCODE_MOV, fs_reg(MRF, first_color_mrf + index + 4, 1898 color.type), 1899 color); 1900 inst->saturate = c->key.clamp_fragment_color; 1901 pop_force_sechalf(); 1902 color.sechalf = false; 1903 } 1904 } 1905} 1906 1907void 1908fs_visitor::emit_fb_writes() 1909{ 1910 this->current_annotation = "FB write header"; 1911 bool header_present = true; 1912 int base_mrf = 2; 1913 int nr = base_mrf; 1914 int reg_width = c->dispatch_width / 8; 1915 1916 if (intel->gen >= 6 && 1917 !this->kill_emitted && 1918 c->key.nr_color_regions == 1) { 1919 header_present = false; 1920 } 1921 1922 if (header_present) { 1923 /* m2, m3 header */ 1924 nr += 2; 1925 } 1926 1927 if (c->aa_dest_stencil_reg) { 1928 push_force_uncompressed(); 1929 emit(BRW_OPCODE_MOV, fs_reg(MRF, nr++), 1930 fs_reg(brw_vec8_grf(c->aa_dest_stencil_reg, 0))); 1931 pop_force_uncompressed(); 1932 } 1933 1934 /* Reserve space for color. It'll be filled in per MRT below. */ 1935 int color_mrf = nr; 1936 nr += 4 * reg_width; 1937 1938 if (c->source_depth_to_render_target) { 1939 if (intel->gen == 6 && c->dispatch_width == 16) { 1940 /* For outputting oDepth on gen6, SIMD8 writes have to be 1941 * used. This would require 8-wide moves of each half to 1942 * message regs, kind of like pre-gen5 SIMD16 FB writes. 1943 * Just bail on doing so for now. 1944 */ 1945 fail("Missing support for simd16 depth writes on gen6\n"); 1946 } 1947 1948 if (c->computes_depth) { 1949 /* Hand over gl_FragDepth. */ 1950 assert(this->frag_depth); 1951 fs_reg depth = *(variable_storage(this->frag_depth)); 1952 1953 emit(BRW_OPCODE_MOV, fs_reg(MRF, nr), depth); 1954 } else { 1955 /* Pass through the payload depth. */ 1956 emit(BRW_OPCODE_MOV, fs_reg(MRF, nr), 1957 fs_reg(brw_vec8_grf(c->source_depth_reg, 0))); 1958 } 1959 nr += reg_width; 1960 } 1961 1962 if (c->dest_depth_reg) { 1963 emit(BRW_OPCODE_MOV, fs_reg(MRF, nr), 1964 fs_reg(brw_vec8_grf(c->dest_depth_reg, 0))); 1965 nr += reg_width; 1966 } 1967 1968 for (int target = 0; target < c->key.nr_color_regions; target++) { 1969 this->current_annotation = ralloc_asprintf(this->mem_ctx, 1970 "FB write target %d", 1971 target); 1972 for (int i = 0; i < 4; i++) 1973 emit_color_write(target, i, color_mrf); 1974 1975 fs_inst *inst = emit(FS_OPCODE_FB_WRITE); 1976 inst->target = target; 1977 inst->base_mrf = base_mrf; 1978 inst->mlen = nr - base_mrf; 1979 if (target == c->key.nr_color_regions - 1) 1980 inst->eot = true; 1981 inst->header_present = header_present; 1982 } 1983 1984 if (c->key.nr_color_regions == 0) { 1985 if (c->key.alpha_test) { 1986 /* If the alpha test is enabled but there's no color buffer, 1987 * we still need to send alpha out the pipeline to our null 1988 * renderbuffer. 1989 */ 1990 emit_color_write(0, 3, color_mrf); 1991 } 1992 1993 fs_inst *inst = emit(FS_OPCODE_FB_WRITE); 1994 inst->base_mrf = base_mrf; 1995 inst->mlen = nr - base_mrf; 1996 inst->eot = true; 1997 inst->header_present = header_present; 1998 } 1999 2000 this->current_annotation = NULL; 2001} 2002 2003void 2004fs_visitor::resolve_ud_negate(fs_reg *reg) 2005{ 2006 if (reg->type != BRW_REGISTER_TYPE_UD || 2007 !reg->negate) 2008 return; 2009 2010 fs_reg temp = fs_reg(this, glsl_type::uint_type); 2011 emit(BRW_OPCODE_MOV, temp, *reg); 2012 *reg = temp; 2013} 2014