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 21 * DEALINGS IN THE SOFTWARE. 22 */ 23 24 #include "glsl_symbol_table.h" 25 #include "ast.h" 26 #include "glsl_types.h" 27 #include "ir.h" 28 #include "main/core.h" /* for MIN2 */ 29 30 static ir_rvalue * 31 convert_component(ir_rvalue *src, const glsl_type *desired_type); 32 33 bool 34 apply_implicit_conversion(const glsl_type *to, ir_rvalue * &from, 35 struct _mesa_glsl_parse_state *state); 36 37 static unsigned 38 process_parameters(exec_list *instructions, exec_list *actual_parameters, 39 exec_list *parameters, 40 struct _mesa_glsl_parse_state *state) 41 { 42 unsigned count = 0; 43 44 foreach_list (n, parameters) { 45 ast_node *const ast = exec_node_data(ast_node, n, link); 46 ir_rvalue *result = ast->hir(instructions, state); 47 48 ir_constant *const constant = result->constant_expression_value(); 49 if (constant != NULL) 50 result = constant; 51 52 actual_parameters->push_tail(result); 53 count++; 54 } 55 56 return count; 57 } 58 59 60 /** 61 * Generate a source prototype for a function signature 62 * 63 * \param return_type Return type of the function. May be \c NULL. 64 * \param name Name of the function. 65 * \param parameters Parameter list for the function. This may be either a 66 * formal or actual parameter list. Only the type is used. 67 * 68 * \return 69 * A hieralloced string representing the prototype of the function. 70 */ 71 char * 72 prototype_string(const glsl_type *return_type, const char *name, 73 exec_list *parameters) 74 { 75 char *str = NULL; 76 77 if (return_type != NULL) 78 str = hieralloc_asprintf(str, "%s ", return_type->name); 79 80 str = hieralloc_asprintf_append(str, "%s(", name); 81 82 const char *comma = ""; 83 foreach_list(node, parameters) { 84 const ir_instruction *const param = (ir_instruction *) node; 85 86 str = hieralloc_asprintf_append(str, "%s%s", comma, param->type->name); 87 comma = ", "; 88 } 89 90 str = hieralloc_strdup_append(str, ")"); 91 return str; 92 } 93 94 95 static ir_rvalue * 96 match_function_by_name(exec_list *instructions, const char *name, 97 YYLTYPE *loc, exec_list *actual_parameters, 98 struct _mesa_glsl_parse_state *state) 99 { 100 void *ctx = state; 101 ir_function *f = state->symbols->get_function(name); 102 ir_function_signature *sig; 103 104 sig = f ? f->matching_signature(actual_parameters) : NULL; 105 106 /* FINISHME: This doesn't handle the case where shader X contains a 107 * FINISHME: matching signature but shader X + N contains an _exact_ 108 * FINISHME: matching signature. 109 */ 110 if (sig == NULL && (f == NULL || state->es_shader || !f->has_user_signature()) && state->symbols->get_type(name) == NULL && (state->language_version == 110 || state->symbols->get_variable(name) == NULL)) { 111 /* The current shader doesn't contain a matching function or signature. 112 * Before giving up, look for the prototype in the built-in functions. 113 */ 114 for (unsigned i = 0; i < state->num_builtins_to_link; i++) { 115 ir_function *builtin; 116 builtin = state->builtins_to_link[i]->symbols->get_function(name); 117 sig = builtin ? builtin->matching_signature(actual_parameters) : NULL; 118 if (sig != NULL) { 119 if (f == NULL) { 120 f = new(ctx) ir_function(name); 121 state->symbols->add_global_function(f); 122 emit_function(state, instructions, f); 123 } 124 125 f->add_signature(sig->clone_prototype(f, NULL)); 126 break; 127 } 128 } 129 } 130 131 if (sig != NULL) { 132 /* Verify that 'out' and 'inout' actual parameters are lvalues. This 133 * isn't done in ir_function::matching_signature because that function 134 * cannot generate the necessary diagnostics. 135 */ 136 exec_list_iterator actual_iter = actual_parameters->iterator(); 137 exec_list_iterator formal_iter = sig->parameters.iterator(); 138 139 while (actual_iter.has_next()) { 140 ir_rvalue *actual = (ir_rvalue *) actual_iter.get(); 141 ir_variable *formal = (ir_variable *) formal_iter.get(); 142 143 assert(actual != NULL); 144 assert(formal != NULL); 145 146 if ((formal->mode == ir_var_out) 147 || (formal->mode == ir_var_inout)) { 148 if (! actual->is_lvalue()) { 149 /* FINISHME: Log a better diagnostic here. There is no way 150 * FINISHME: to tell the user which parameter is invalid. 151 */ 152 _mesa_glsl_error(loc, state, "`%s' parameter is not lvalue", 153 (formal->mode == ir_var_out) ? "out" : "inout"); 154 } 155 } 156 157 if (formal->type->is_numeric() || formal->type->is_boolean()) { 158 ir_rvalue *converted = convert_component(actual, formal->type); 159 actual->replace_with(converted); 160 } 161 162 actual_iter.next(); 163 formal_iter.next(); 164 } 165 166 /* Always insert the call in the instruction stream, and return a deref 167 * of its return val if it returns a value, since we don't know if 168 * the rvalue is going to be assigned to anything or not. 169 */ 170 ir_call *call = new(ctx) ir_call(sig, actual_parameters); 171 if (!sig->return_type->is_void()) { 172 ir_variable *var; 173 ir_dereference_variable *deref; 174 175 var = new(ctx) ir_variable(sig->return_type, 176 hieralloc_asprintf(ctx, "%s_retval", 177 sig->function_name()), 178 ir_var_temporary); 179 instructions->push_tail(var); 180 181 deref = new(ctx) ir_dereference_variable(var); 182 ir_assignment *assign = new(ctx) ir_assignment(deref, call, NULL); 183 instructions->push_tail(assign); 184 if (state->language_version >= 120) 185 var->constant_value = call->constant_expression_value(); 186 187 deref = new(ctx) ir_dereference_variable(var); 188 return deref; 189 } else { 190 instructions->push_tail(call); 191 return NULL; 192 } 193 } else { 194 char *str = prototype_string(NULL, name, actual_parameters); 195 196 _mesa_glsl_error(loc, state, "no matching function for call to `%s'", 197 str); 198 hieralloc_free(str); 199 200 const char *prefix = "candidates are: "; 201 202 for (int i = -1; i < state->num_builtins_to_link; i++) { 203 glsl_symbol_table *syms = i >= 0 ? state->builtins_to_link[i]->symbols 204 : state->symbols; 205 f = syms->get_function(name); 206 if (f == NULL) 207 continue; 208 209 foreach_list (node, &f->signatures) { 210 ir_function_signature *sig = (ir_function_signature *) node; 211 212 str = prototype_string(sig->return_type, f->name, &sig->parameters); 213 _mesa_glsl_error(loc, state, "%s%s\n", prefix, str); 214 hieralloc_free(str); 215 216 prefix = " "; 217 } 218 219 } 220 221 return ir_call::get_error_instruction(ctx); 222 } 223 } 224 225 226 /** 227 * Perform automatic type conversion of constructor parameters 228 * 229 * This implements the rules in the "Conversion and Scalar Constructors" 230 * section (GLSL 1.10 section 5.4.1), not the "Implicit Conversions" rules. 231 */ 232 static ir_rvalue * 233 convert_component(ir_rvalue *src, const glsl_type *desired_type) 234 { 235 void *ctx = hieralloc_parent(src); 236 const unsigned a = desired_type->base_type; 237 const unsigned b = src->type->base_type; 238 ir_expression *result = NULL; 239 240 if (src->type->is_error()) 241 return src; 242 243 assert(a <= GLSL_TYPE_BOOL); 244 assert(b <= GLSL_TYPE_BOOL); 245 246 if ((a == b) || (src->type->is_integer() && desired_type->is_integer())) 247 return src; 248 249 switch (a) { 250 case GLSL_TYPE_UINT: 251 case GLSL_TYPE_INT: 252 if (b == GLSL_TYPE_FLOAT) 253 result = new(ctx) ir_expression(ir_unop_f2i, desired_type, src, NULL); 254 else { 255 assert(b == GLSL_TYPE_BOOL); 256 result = new(ctx) ir_expression(ir_unop_b2i, desired_type, src, NULL); 257 } 258 break; 259 case GLSL_TYPE_FLOAT: 260 switch (b) { 261 case GLSL_TYPE_UINT: 262 result = new(ctx) ir_expression(ir_unop_u2f, desired_type, src, NULL); 263 break; 264 case GLSL_TYPE_INT: 265 result = new(ctx) ir_expression(ir_unop_i2f, desired_type, src, NULL); 266 break; 267 case GLSL_TYPE_BOOL: 268 result = new(ctx) ir_expression(ir_unop_b2f, desired_type, src, NULL); 269 break; 270 } 271 break; 272 case GLSL_TYPE_BOOL: 273 switch (b) { 274 case GLSL_TYPE_UINT: 275 case GLSL_TYPE_INT: 276 result = new(ctx) ir_expression(ir_unop_i2b, desired_type, src, NULL); 277 break; 278 case GLSL_TYPE_FLOAT: 279 result = new(ctx) ir_expression(ir_unop_f2b, desired_type, src, NULL); 280 break; 281 } 282 break; 283 } 284 285 assert(result != NULL); 286 287 /* Try constant folding; it may fold in the conversion we just added. */ 288 ir_constant *const constant = result->constant_expression_value(); 289 return (constant != NULL) ? (ir_rvalue *) constant : (ir_rvalue *) result; 290 } 291 292 /** 293 * Dereference a specific component from a scalar, vector, or matrix 294 */ 295 static ir_rvalue * 296 dereference_component(ir_rvalue *src, unsigned component) 297 { 298 void *ctx = hieralloc_parent(src); 299 assert(component < src->type->components()); 300 301 /* If the source is a constant, just create a new constant instead of a 302 * dereference of the existing constant. 303 */ 304 ir_constant *constant = src->as_constant(); 305 if (constant) 306 return new(ctx) ir_constant(constant, component); 307 308 if (src->type->is_scalar()) { 309 return src; 310 } else if (src->type->is_vector()) { 311 return new(ctx) ir_swizzle(src, component, 0, 0, 0, 1); 312 } else { 313 assert(src->type->is_matrix()); 314 315 /* Dereference a row of the matrix, then call this function again to get 316 * a specific element from that row. 317 */ 318 const int c = component / src->type->column_type()->vector_elements; 319 const int r = component % src->type->column_type()->vector_elements; 320 ir_constant *const col_index = new(ctx) ir_constant(c); 321 ir_dereference *const col = new(ctx) ir_dereference_array(src, col_index); 322 323 col->type = src->type->column_type(); 324 325 return dereference_component(col, r); 326 } 327 328 assert(!"Should not get here."); 329 return NULL; 330 } 331 332 333 static ir_rvalue * 334 process_array_constructor(exec_list *instructions, 335 const glsl_type *constructor_type, 336 YYLTYPE *loc, exec_list *parameters, 337 struct _mesa_glsl_parse_state *state) 338 { 339 void *ctx = state; 340 /* Array constructors come in two forms: sized and unsized. Sized array 341 * constructors look like 'vec4[2](a, b)', where 'a' and 'b' are vec4 342 * variables. In this case the number of parameters must exactly match the 343 * specified size of the array. 344 * 345 * Unsized array constructors look like 'vec4[](a, b)', where 'a' and 'b' 346 * are vec4 variables. In this case the size of the array being constructed 347 * is determined by the number of parameters. 348 * 349 * From page 52 (page 58 of the PDF) of the GLSL 1.50 spec: 350 * 351 * "There must be exactly the same number of arguments as the size of 352 * the array being constructed. If no size is present in the 353 * constructor, then the array is explicitly sized to the number of 354 * arguments provided. The arguments are assigned in order, starting at 355 * element 0, to the elements of the constructed array. Each argument 356 * must be the same type as the element type of the array, or be a type 357 * that can be converted to the element type of the array according to 358 * Section 4.1.10 "Implicit Conversions."" 359 */ 360 exec_list actual_parameters; 361 const unsigned parameter_count = 362 process_parameters(instructions, &actual_parameters, parameters, state); 363 364 if ((parameter_count == 0) 365 || ((constructor_type->length != 0) 366 && (constructor_type->length != parameter_count))) { 367 const unsigned min_param = (constructor_type->length == 0) 368 ? 1 : constructor_type->length; 369 370 _mesa_glsl_error(loc, state, "array constructor must have %s %u " 371 "parameter%s", 372 (constructor_type->length != 0) ? "at least" : "exactly", 373 min_param, (min_param <= 1) ? "" : "s"); 374 return ir_call::get_error_instruction(ctx); 375 } 376 377 if (constructor_type->length == 0) { 378 constructor_type = 379 glsl_type::get_array_instance(constructor_type->element_type(), 380 parameter_count); 381 assert(constructor_type != NULL); 382 assert(constructor_type->length == parameter_count); 383 } 384 385 bool all_parameters_are_constant = true; 386 387 /* Type cast each parameter and, if possible, fold constants. */ 388 foreach_list_safe(n, &actual_parameters) { 389 ir_rvalue *ir = (ir_rvalue *) n; 390 ir_rvalue *result = ir; 391 392 /* Apply implicit conversions (not the scalar constructor rules!) */ 393 if (constructor_type->element_type()->is_float()) { 394 const glsl_type *desired_type = 395 glsl_type::get_instance(GLSL_TYPE_FLOAT, 396 ir->type->vector_elements, 397 ir->type->matrix_columns); 398 result = convert_component(ir, desired_type); 399 } 400 401 if (result->type != constructor_type->element_type()) { 402 _mesa_glsl_error(loc, state, "type error in array constructor: " 403 "expected: %s, found %s", 404 constructor_type->element_type()->name, 405 result->type->name); 406 } 407 408 /* Attempt to convert the parameter to a constant valued expression. 409 * After doing so, track whether or not all the parameters to the 410 * constructor are trivially constant valued expressions. 411 */ 412 ir_rvalue *const constant = result->constant_expression_value(); 413 414 if (constant != NULL) 415 result = constant; 416 else 417 all_parameters_are_constant = false; 418 419 ir->replace_with(result); 420 } 421 422 if (all_parameters_are_constant) 423 return new(ctx) ir_constant(constructor_type, &actual_parameters); 424 425 ir_variable *var = new(ctx) ir_variable(constructor_type, "array_ctor", 426 ir_var_temporary); 427 instructions->push_tail(var); 428 429 int i = 0; 430 foreach_list(node, &actual_parameters) { 431 ir_rvalue *rhs = (ir_rvalue *) node; 432 ir_rvalue *lhs = new(ctx) ir_dereference_array(var, 433 new(ctx) ir_constant(i)); 434 435 ir_instruction *assignment = new(ctx) ir_assignment(lhs, rhs, NULL); 436 instructions->push_tail(assignment); 437 438 i++; 439 } 440 441 return new(ctx) ir_dereference_variable(var); 442 } 443 444 445 /** 446 * Try to convert a record constructor to a constant expression 447 */ 448 static ir_constant * 449 constant_record_constructor(const glsl_type *constructor_type, 450 exec_list *parameters, void *mem_ctx) 451 { 452 foreach_list(node, parameters) { 453 ir_constant *constant = ((ir_instruction *) node)->as_constant(); 454 if (constant == NULL) 455 return NULL; 456 node->replace_with(constant); 457 } 458 459 return new(mem_ctx) ir_constant(constructor_type, parameters); 460 } 461 462 463 /** 464 * Determine if a list consists of a single scalar r-value 465 */ 466 bool 467 single_scalar_parameter(exec_list *parameters) 468 { 469 const ir_rvalue *const p = (ir_rvalue *) parameters->head; 470 assert(((ir_rvalue *)p)->as_rvalue() != NULL); 471 472 return (p->type->is_scalar() && p->next->is_tail_sentinel()); 473 } 474 475 476 /** 477 * Generate inline code for a vector constructor 478 * 479 * The generated constructor code will consist of a temporary variable 480 * declaration of the same type as the constructor. A sequence of assignments 481 * from constructor parameters to the temporary will follow. 482 * 483 * \return 484 * An \c ir_dereference_variable of the temprorary generated in the constructor 485 * body. 486 */ 487 ir_rvalue * 488 emit_inline_vector_constructor(const glsl_type *type, 489 exec_list *instructions, 490 exec_list *parameters, 491 void *ctx) 492 { 493 assert(!parameters->is_empty()); 494 495 ir_variable *var = new(ctx) ir_variable(type, "vec_ctor", ir_var_temporary); 496 instructions->push_tail(var); 497 498 /* There are two kinds of vector constructors. 499 * 500 * - Construct a vector from a single scalar by replicating that scalar to 501 * all components of the vector. 502 * 503 * - Construct a vector from an arbirary combination of vectors and 504 * scalars. The components of the constructor parameters are assigned 505 * to the vector in order until the vector is full. 506 */ 507 const unsigned lhs_components = type->components(); 508 if (single_scalar_parameter(parameters)) { 509 ir_rvalue *first_param = (ir_rvalue *)parameters->head; 510 ir_rvalue *rhs = new(ctx) ir_swizzle(first_param, 0, 0, 0, 0, 511 lhs_components); 512 ir_dereference_variable *lhs = new(ctx) ir_dereference_variable(var); 513 const unsigned mask = (1U << lhs_components) - 1; 514 515 assert(rhs->type == lhs->type); 516 517 ir_instruction *inst = new(ctx) ir_assignment(lhs, rhs, NULL, mask); 518 instructions->push_tail(inst); 519 } else { 520 unsigned base_component = 0; 521 unsigned base_lhs_component = 0; 522 ir_constant_data data; 523 unsigned constant_mask = 0, constant_components = 0; 524 525 memset(&data, 0, sizeof(data)); 526 527 foreach_list(node, parameters) { 528 ir_rvalue *param = (ir_rvalue *) node; 529 unsigned rhs_components = param->type->components(); 530 531 /* Do not try to assign more components to the vector than it has! 532 */ 533 if ((rhs_components + base_lhs_component) > lhs_components) { 534 rhs_components = lhs_components - base_lhs_component; 535 } 536 537 const ir_constant *const c = param->as_constant(); 538 if (c != NULL) { 539 for (unsigned i = 0; i < rhs_components; i++) { 540 switch (c->type->base_type) { 541 case GLSL_TYPE_UINT: 542 data.u[i + base_component] = c->get_uint_component(i); 543 break; 544 case GLSL_TYPE_INT: 545 data.i[i + base_component] = c->get_int_component(i); 546 break; 547 case GLSL_TYPE_FLOAT: 548 data.f[i + base_component] = c->get_float_component(i); 549 break; 550 case GLSL_TYPE_BOOL: 551 data.b[i + base_component] = c->get_bool_component(i); 552 break; 553 default: 554 assert(!"Should not get here."); 555 break; 556 } 557 } 558 559 /* Mask of fields to be written in the assignment. 560 */ 561 constant_mask |= ((1U << rhs_components) - 1) << base_lhs_component; 562 constant_components += rhs_components; 563 564 base_component += rhs_components; 565 } 566 /* Advance the component index by the number of components 567 * that were just assigned. 568 */ 569 base_lhs_component += rhs_components; 570 } 571 572 if (constant_mask != 0) { 573 ir_dereference *lhs = new(ctx) ir_dereference_variable(var); 574 const glsl_type *rhs_type = glsl_type::get_instance(var->type->base_type, 575 constant_components, 576 1); 577 ir_rvalue *rhs = new(ctx) ir_constant(rhs_type, &data); 578 579 ir_instruction *inst = 580 new(ctx) ir_assignment(lhs, rhs, NULL, constant_mask); 581 instructions->push_tail(inst); 582 } 583 584 base_component = 0; 585 foreach_list(node, parameters) { 586 ir_rvalue *param = (ir_rvalue *) node; 587 unsigned rhs_components = param->type->components(); 588 589 /* Do not try to assign more components to the vector than it has! 590 */ 591 if ((rhs_components + base_component) > lhs_components) { 592 rhs_components = lhs_components - base_component; 593 } 594 595 const ir_constant *const c = param->as_constant(); 596 if (c == NULL) { 597 /* Mask of fields to be written in the assignment. 598 */ 599 const unsigned write_mask = ((1U << rhs_components) - 1) 600 << base_component; 601 602 ir_dereference *lhs = new(ctx) ir_dereference_variable(var); 603 604 /* Generate a swizzle so that LHS and RHS sizes match. 605 */ 606 ir_rvalue *rhs = 607 new(ctx) ir_swizzle(param, 0, 1, 2, 3, rhs_components); 608 609 ir_instruction *inst = 610 new(ctx) ir_assignment(lhs, rhs, NULL, write_mask); 611 instructions->push_tail(inst); 612 } 613 614 /* Advance the component index by the number of components that were 615 * just assigned. 616 */ 617 base_component += rhs_components; 618 } 619 } 620 return new(ctx) ir_dereference_variable(var); 621 } 622 623 624 /** 625 * Generate assignment of a portion of a vector to a portion of a matrix column 626 * 627 * \param src_base First component of the source to be used in assignment 628 * \param column Column of destination to be assiged 629 * \param row_base First component of the destination column to be assigned 630 * \param count Number of components to be assigned 631 * 632 * \note 633 * \c src_base + \c count must be less than or equal to the number of components 634 * in the source vector. 635 */ 636 ir_instruction * 637 assign_to_matrix_column(ir_variable *var, unsigned column, unsigned row_base, 638 ir_rvalue *src, unsigned src_base, unsigned count, 639 void *mem_ctx) 640 { 641 ir_constant *col_idx = new(mem_ctx) ir_constant(column); 642 ir_dereference *column_ref = new(mem_ctx) ir_dereference_array(var, col_idx); 643 644 assert(column_ref->type->components() >= (row_base + count)); 645 assert(src->type->components() >= (src_base + count)); 646 647 /* Generate a swizzle that extracts the number of components from the source 648 * that are to be assigned to the column of the matrix. 649 */ 650 if (count < src->type->vector_elements) { 651 src = new(mem_ctx) ir_swizzle(src, 652 src_base + 0, src_base + 1, 653 src_base + 2, src_base + 3, 654 count); 655 } 656 657 /* Mask of fields to be written in the assignment. 658 */ 659 const unsigned write_mask = ((1U << count) - 1) << row_base; 660 661 return new(mem_ctx) ir_assignment(column_ref, src, NULL, write_mask); 662 } 663 664 665 /** 666 * Generate inline code for a matrix constructor 667 * 668 * The generated constructor code will consist of a temporary variable 669 * declaration of the same type as the constructor. A sequence of assignments 670 * from constructor parameters to the temporary will follow. 671 * 672 * \return 673 * An \c ir_dereference_variable of the temprorary generated in the constructor 674 * body. 675 */ 676 ir_rvalue * 677 emit_inline_matrix_constructor(const glsl_type *type, 678 exec_list *instructions, 679 exec_list *parameters, 680 void *ctx) 681 { 682 assert(!parameters->is_empty()); 683 684 ir_variable *var = new(ctx) ir_variable(type, "mat_ctor", ir_var_temporary); 685 instructions->push_tail(var); 686 687 /* There are three kinds of matrix constructors. 688 * 689 * - Construct a matrix from a single scalar by replicating that scalar to 690 * along the diagonal of the matrix and setting all other components to 691 * zero. 692 * 693 * - Construct a matrix from an arbirary combination of vectors and 694 * scalars. The components of the constructor parameters are assigned 695 * to the matrix in colum-major order until the matrix is full. 696 * 697 * - Construct a matrix from a single matrix. The source matrix is copied 698 * to the upper left portion of the constructed matrix, and the remaining 699 * elements take values from the identity matrix. 700 */ 701 ir_rvalue *const first_param = (ir_rvalue *) parameters->head; 702 if (single_scalar_parameter(parameters)) { 703 /* Assign the scalar to the X component of a vec4, and fill the remaining 704 * components with zero. 705 */ 706 ir_variable *rhs_var = 707 new(ctx) ir_variable(glsl_type::vec4_type, "mat_ctor_vec", 708 ir_var_temporary); 709 instructions->push_tail(rhs_var); 710 711 ir_constant_data zero; 712 zero.f[0] = 0.0; 713 zero.f[1] = 0.0; 714 zero.f[2] = 0.0; 715 zero.f[3] = 0.0; 716 717 ir_instruction *inst = 718 new(ctx) ir_assignment(new(ctx) ir_dereference_variable(rhs_var), 719 new(ctx) ir_constant(rhs_var->type, &zero), 720 NULL); 721 instructions->push_tail(inst); 722 723 ir_dereference *const rhs_ref = new(ctx) ir_dereference_variable(rhs_var); 724 725 inst = new(ctx) ir_assignment(rhs_ref, first_param, NULL, 0x01); 726 instructions->push_tail(inst); 727 728 /* Assign the temporary vector to each column of the destination matrix 729 * with a swizzle that puts the X component on the diagonal of the 730 * matrix. In some cases this may mean that the X component does not 731 * get assigned into the column at all (i.e., when the matrix has more 732 * columns than rows). 733 */ 734 static const unsigned rhs_swiz[4][4] = { 735 { 0, 1, 1, 1 }, 736 { 1, 0, 1, 1 }, 737 { 1, 1, 0, 1 }, 738 { 1, 1, 1, 0 } 739 }; 740 741 const unsigned cols_to_init = MIN2(type->matrix_columns, 742 type->vector_elements); 743 for (unsigned i = 0; i < cols_to_init; i++) { 744 ir_constant *const col_idx = new(ctx) ir_constant(i); 745 ir_rvalue *const col_ref = new(ctx) ir_dereference_array(var, col_idx); 746 747 ir_rvalue *const rhs_ref = new(ctx) ir_dereference_variable(rhs_var); 748 ir_rvalue *const rhs = new(ctx) ir_swizzle(rhs_ref, rhs_swiz[i], 749 type->vector_elements); 750 751 inst = new(ctx) ir_assignment(col_ref, rhs, NULL); 752 instructions->push_tail(inst); 753 } 754 755 for (unsigned i = cols_to_init; i < type->matrix_columns; i++) { 756 ir_constant *const col_idx = new(ctx) ir_constant(i); 757 ir_rvalue *const col_ref = new(ctx) ir_dereference_array(var, col_idx); 758 759 ir_rvalue *const rhs_ref = new(ctx) ir_dereference_variable(rhs_var); 760 ir_rvalue *const rhs = new(ctx) ir_swizzle(rhs_ref, 1, 1, 1, 1, 761 type->vector_elements); 762 763 inst = new(ctx) ir_assignment(col_ref, rhs, NULL); 764 instructions->push_tail(inst); 765 } 766 } else if (first_param->type->is_matrix()) { 767 /* From page 50 (56 of the PDF) of the GLSL 1.50 spec: 768 * 769 * "If a matrix is constructed from a matrix, then each component 770 * (column i, row j) in the result that has a corresponding 771 * component (column i, row j) in the argument will be initialized 772 * from there. All other components will be initialized to the 773 * identity matrix. If a matrix argument is given to a matrix 774 * constructor, it is an error to have any other arguments." 775 */ 776 assert(first_param->next->is_tail_sentinel()); 777 ir_rvalue *const src_matrix = first_param; 778 779 /* If the source matrix is smaller, pre-initialize the relavent parts of 780 * the destination matrix to the identity matrix. 781 */ 782 if ((src_matrix->type->matrix_columns < var->type->matrix_columns) 783 || (src_matrix->type->vector_elements < var->type->vector_elements)) { 784 785 /* If the source matrix has fewer rows, every column of the destination 786 * must be initialized. Otherwise only the columns in the destination 787 * that do not exist in the source must be initialized. 788 */ 789 unsigned col = 790 (src_matrix->type->vector_elements < var->type->vector_elements) 791 ? 0 : src_matrix->type->matrix_columns; 792 793 const glsl_type *const col_type = var->type->column_type(); 794 for (/* empty */; col < var->type->matrix_columns; col++) { 795 ir_constant_data ident; 796 797 ident.f[0] = 0.0; 798 ident.f[1] = 0.0; 799 ident.f[2] = 0.0; 800 ident.f[3] = 0.0; 801 802 ident.f[col] = 1.0; 803 804 ir_rvalue *const rhs = new(ctx) ir_constant(col_type, &ident); 805 806 ir_rvalue *const lhs = 807 new(ctx) ir_dereference_array(var, new(ctx) ir_constant(col)); 808 809 ir_instruction *inst = new(ctx) ir_assignment(lhs, rhs, NULL); 810 instructions->push_tail(inst); 811 } 812 } 813 814 /* Assign columns from the source matrix to the destination matrix. 815 * 816 * Since the parameter will be used in the RHS of multiple assignments, 817 * generate a temporary and copy the paramter there. 818 */ 819 ir_variable *const rhs_var = 820 new(ctx) ir_variable(first_param->type, "mat_ctor_mat", 821 ir_var_temporary); 822 instructions->push_tail(rhs_var); 823 824 ir_dereference *const rhs_var_ref = 825 new(ctx) ir_dereference_variable(rhs_var); 826 ir_instruction *const inst = 827 new(ctx) ir_assignment(rhs_var_ref, first_param, NULL); 828 instructions->push_tail(inst); 829 830 const unsigned last_row = MIN2(src_matrix->type->vector_elements, 831 var->type->vector_elements); 832 const unsigned last_col = MIN2(src_matrix->type->matrix_columns, 833 var->type->matrix_columns); 834 835 unsigned swiz[4] = { 0, 0, 0, 0 }; 836 for (unsigned i = 1; i < last_row; i++) 837 swiz[i] = i; 838 839 const unsigned write_mask = (1U << last_row) - 1; 840 841 for (unsigned i = 0; i < last_col; i++) { 842 ir_dereference *const lhs = 843 new(ctx) ir_dereference_array(var, new(ctx) ir_constant(i)); 844 ir_rvalue *const rhs_col = 845 new(ctx) ir_dereference_array(rhs_var, new(ctx) ir_constant(i)); 846 847 /* If one matrix has columns that are smaller than the columns of the 848 * other matrix, wrap the column access of the larger with a swizzle 849 * so that the LHS and RHS of the assignment have the same size (and 850 * therefore have the same type). 851 * 852 * It would be perfectly valid to unconditionally generate the 853 * swizzles, this this will typically result in a more compact IR tree. 854 */ 855 ir_rvalue *rhs; 856 if (lhs->type->vector_elements != rhs_col->type->vector_elements) { 857 rhs = new(ctx) ir_swizzle(rhs_col, swiz, last_row); 858 } else { 859 rhs = rhs_col; 860 } 861 862 ir_instruction *inst = 863 new(ctx) ir_assignment(lhs, rhs, NULL, write_mask); 864 instructions->push_tail(inst); 865 } 866 } else { 867 const unsigned cols = type->matrix_columns; 868 const unsigned rows = type->vector_elements; 869 unsigned col_idx = 0; 870 unsigned row_idx = 0; 871 872 foreach_list (node, parameters) { 873 ir_rvalue *const rhs = (ir_rvalue *) node; 874 const unsigned components_remaining_this_column = rows - row_idx; 875 unsigned rhs_components = rhs->type->components(); 876 unsigned rhs_base = 0; 877 878 /* Since the parameter might be used in the RHS of two assignments, 879 * generate a temporary and copy the paramter there. 880 */ 881 ir_variable *rhs_var = 882 new(ctx) ir_variable(rhs->type, "mat_ctor_vec", ir_var_temporary); 883 instructions->push_tail(rhs_var); 884 885 ir_dereference *rhs_var_ref = 886 new(ctx) ir_dereference_variable(rhs_var); 887 ir_instruction *inst = new(ctx) ir_assignment(rhs_var_ref, rhs, NULL); 888 instructions->push_tail(inst); 889 890 /* Assign the current parameter to as many components of the matrix 891 * as it will fill. 892 * 893 * NOTE: A single vector parameter can span two matrix columns. A 894 * single vec4, for example, can completely fill a mat2. 895 */ 896 if (rhs_components >= components_remaining_this_column) { 897 const unsigned count = MIN2(rhs_components, 898 components_remaining_this_column); 899 900 rhs_var_ref = new(ctx) ir_dereference_variable(rhs_var); 901 902 ir_instruction *inst = assign_to_matrix_column(var, col_idx, 903 row_idx, 904 rhs_var_ref, 0, 905 count, ctx); 906 instructions->push_tail(inst); 907 908 rhs_base = count; 909 910 col_idx++; 911 row_idx = 0; 912 } 913 914 /* If there is data left in the parameter and components left to be 915 * set in the destination, emit another assignment. It is possible 916 * that the assignment could be of a vec4 to the last element of the 917 * matrix. In this case col_idx==cols, but there is still data 918 * left in the source parameter. Obviously, don't emit an assignment 919 * to data outside the destination matrix. 920 */ 921 if ((col_idx < cols) && (rhs_base < rhs_components)) { 922 const unsigned count = rhs_components - rhs_base; 923 924 rhs_var_ref = new(ctx) ir_dereference_variable(rhs_var); 925 926 ir_instruction *inst = assign_to_matrix_column(var, col_idx, 927 row_idx, 928 rhs_var_ref, 929 rhs_base, 930 count, ctx); 931 instructions->push_tail(inst); 932 933 row_idx += count; 934 } 935 } 936 } 937 938 return new(ctx) ir_dereference_variable(var); 939 } 940 941 942 ir_rvalue * 943 emit_inline_record_constructor(const glsl_type *type, 944 exec_list *instructions, 945 exec_list *parameters, 946 void *mem_ctx) 947 { 948 ir_variable *const var = 949 new(mem_ctx) ir_variable(type, "record_ctor", ir_var_temporary); 950 ir_dereference_variable *const d = new(mem_ctx) ir_dereference_variable(var); 951 952 instructions->push_tail(var); 953 954 exec_node *node = parameters->head; 955 for (unsigned i = 0; i < type->length; i++) { 956 assert(!node->is_tail_sentinel()); 957 958 ir_dereference *const lhs = 959 new(mem_ctx) ir_dereference_record(d->clone(mem_ctx, NULL), 960 type->fields.structure[i].name); 961 962 ir_rvalue *const rhs = ((ir_instruction *) node)->as_rvalue(); 963 assert(rhs != NULL); 964 965 ir_instruction *const assign = new(mem_ctx) ir_assignment(lhs, rhs, NULL); 966 967 instructions->push_tail(assign); 968 node = node->next; 969 } 970 971 return d; 972 } 973 974 975 ir_rvalue * 976 ast_function_expression::hir(exec_list *instructions, 977 struct _mesa_glsl_parse_state *state) 978 { 979 void *ctx = state; 980 /* There are three sorts of function calls. 981 * 982 * 1. constructors - The first subexpression is an ast_type_specifier. 983 * 2. methods - Only the .length() method of array types. 984 * 3. functions - Calls to regular old functions. 985 * 986 * Method calls are actually detected when the ast_field_selection 987 * expression is handled. 988 */ 989 if (is_constructor()) { 990 const ast_type_specifier *type = (ast_type_specifier *) subexpressions[0]; 991 YYLTYPE loc = type->get_location(); 992 const char *name; 993 994 const glsl_type *const constructor_type = type->glsl_type(& name, state); 995 996 997 /* Constructors for samplers are illegal. 998 */ 999 if (constructor_type->is_sampler()) { 1000 _mesa_glsl_error(& loc, state, "cannot construct sampler type `%s'", 1001 constructor_type->name); 1002 return ir_call::get_error_instruction(ctx); 1003 } 1004 1005 if (constructor_type->is_array()) { 1006 if (state->language_version <= 110) { 1007 _mesa_glsl_error(& loc, state, 1008 "array constructors forbidden in GLSL 1.10"); 1009 return ir_call::get_error_instruction(ctx); 1010 } 1011 1012 return process_array_constructor(instructions, constructor_type, 1013 & loc, &this->expressions, state); 1014 } 1015 1016 1017 /* There are two kinds of constructor call. Constructors for built-in 1018 * language types, such as mat4 and vec2, are free form. The only 1019 * requirement is that the parameters must provide enough values of the 1020 * correct scalar type. Constructors for arrays and structures must 1021 * have the exact number of parameters with matching types in the 1022 * correct order. These constructors follow essentially the same type 1023 * matching rules as functions. 1024 */ 1025 if (!constructor_type->is_numeric() && !constructor_type->is_boolean()) 1026 return ir_call::get_error_instruction(ctx); 1027 1028 /* Total number of components of the type being constructed. */ 1029 const unsigned type_components = constructor_type->components(); 1030 1031 /* Number of components from parameters that have actually been 1032 * consumed. This is used to perform several kinds of error checking. 1033 */ 1034 unsigned components_used = 0; 1035 1036 unsigned matrix_parameters = 0; 1037 unsigned nonmatrix_parameters = 0; 1038 exec_list actual_parameters; 1039 1040 foreach_list (n, &this->expressions) { 1041 ast_node *ast = exec_node_data(ast_node, n, link); 1042 ir_rvalue *result = ast->hir(instructions, state)->as_rvalue(); 1043 1044 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec: 1045 * 1046 * "It is an error to provide extra arguments beyond this 1047 * last used argument." 1048 */ 1049 if (components_used >= type_components) { 1050 _mesa_glsl_error(& loc, state, "too many parameters to `%s' " 1051 "constructor", 1052 constructor_type->name); 1053 return ir_call::get_error_instruction(ctx); 1054 } 1055 1056 if (!result->type->is_numeric() && !result->type->is_boolean()) { 1057 _mesa_glsl_error(& loc, state, "cannot construct `%s' from a " 1058 "non-numeric data type", 1059 constructor_type->name); 1060 return ir_call::get_error_instruction(ctx); 1061 } 1062 1063 /* Count the number of matrix and nonmatrix parameters. This 1064 * is used below to enforce some of the constructor rules. 1065 */ 1066 if (result->type->is_matrix()) 1067 matrix_parameters++; 1068 else 1069 nonmatrix_parameters++; 1070 1071 actual_parameters.push_tail(result); 1072 components_used += result->type->components(); 1073 } 1074 1075 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec: 1076 * 1077 * "It is an error to construct matrices from other matrices. This 1078 * is reserved for future use." 1079 */ 1080 if (state->language_version == 110 && matrix_parameters > 0 1081 && constructor_type->is_matrix()) { 1082 _mesa_glsl_error(& loc, state, "cannot construct `%s' from a " 1083 "matrix in GLSL 1.10", 1084 constructor_type->name); 1085 return ir_call::get_error_instruction(ctx); 1086 } 1087 1088 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec: 1089 * 1090 * "If a matrix argument is given to a matrix constructor, it is 1091 * an error to have any other arguments." 1092 */ 1093 if ((matrix_parameters > 0) 1094 && ((matrix_parameters + nonmatrix_parameters) > 1) 1095 && constructor_type->is_matrix()) { 1096 _mesa_glsl_error(& loc, state, "for matrix `%s' constructor, " 1097 "matrix must be only parameter", 1098 constructor_type->name); 1099 return ir_call::get_error_instruction(ctx); 1100 } 1101 1102 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec: 1103 * 1104 * "In these cases, there must be enough components provided in the 1105 * arguments to provide an initializer for every component in the 1106 * constructed value." 1107 */ 1108 if (components_used < type_components && components_used != 1 1109 && matrix_parameters == 0) { 1110 _mesa_glsl_error(& loc, state, "too few components to construct " 1111 "`%s'", 1112 constructor_type->name); 1113 return ir_call::get_error_instruction(ctx); 1114 } 1115 1116 /* Later, we cast each parameter to the same base type as the 1117 * constructor. Since there are no non-floating point matrices, we 1118 * need to break them up into a series of column vectors. 1119 */ 1120 if (constructor_type->base_type != GLSL_TYPE_FLOAT) { 1121 foreach_list_safe(n, &actual_parameters) { 1122 ir_rvalue *matrix = (ir_rvalue *) n; 1123 1124 if (!matrix->type->is_matrix()) 1125 continue; 1126 1127 /* Create a temporary containing the matrix. */ 1128 ir_variable *var = new(ctx) ir_variable(matrix->type, "matrix_tmp", 1129 ir_var_temporary); 1130 instructions->push_tail(var); 1131 instructions->push_tail(new(ctx) ir_assignment(new(ctx) 1132 ir_dereference_variable(var), matrix, NULL)); 1133 var->constant_value = matrix->constant_expression_value(); 1134 1135 /* Replace the matrix with dereferences of its columns. */ 1136 for (int i = 0; i < matrix->type->matrix_columns; i++) { 1137 matrix->insert_before(new (ctx) ir_dereference_array(var, 1138 new(ctx) ir_constant(i))); 1139 } 1140 matrix->remove(); 1141 } 1142 } 1143 1144 bool all_parameters_are_constant = true; 1145 1146 /* Type cast each parameter and, if possible, fold constants.*/ 1147 foreach_list_safe(n, &actual_parameters) { 1148 ir_rvalue *ir = (ir_rvalue *) n; 1149 1150 const glsl_type *desired_type = 1151 glsl_type::get_instance(constructor_type->base_type, 1152 ir->type->vector_elements, 1153 ir->type->matrix_columns); 1154 ir_rvalue *result = convert_component(ir, desired_type); 1155 1156 /* Attempt to convert the parameter to a constant valued expression. 1157 * After doing so, track whether or not all the parameters to the 1158 * constructor are trivially constant valued expressions. 1159 */ 1160 ir_rvalue *const constant = result->constant_expression_value(); 1161 1162 if (constant != NULL) 1163 result = constant; 1164 else 1165 all_parameters_are_constant = false; 1166 1167 if (result != ir) { 1168 ir->replace_with(result); 1169 } 1170 } 1171 1172 /* If all of the parameters are trivially constant, create a 1173 * constant representing the complete collection of parameters. 1174 */ 1175 if (all_parameters_are_constant) { 1176 return new(ctx) ir_constant(constructor_type, &actual_parameters); 1177 } else if (constructor_type->is_scalar()) { 1178 return dereference_component((ir_rvalue *) actual_parameters.head, 1179 0); 1180 } else if (constructor_type->is_vector()) { 1181 return emit_inline_vector_constructor(constructor_type, 1182 instructions, 1183 &actual_parameters, 1184 ctx); 1185 } else { 1186 assert(constructor_type->is_matrix()); 1187 return emit_inline_matrix_constructor(constructor_type, 1188 instructions, 1189 &actual_parameters, 1190 ctx); 1191 } 1192 } else { 1193 const ast_expression *id = subexpressions[0]; 1194 YYLTYPE loc = id->get_location(); 1195 exec_list actual_parameters; 1196 1197 process_parameters(instructions, &actual_parameters, &this->expressions, 1198 state); 1199 1200 const glsl_type *const type = 1201 state->symbols->get_type(id->primary_expression.identifier); 1202 1203 if ((type != NULL) && type->is_record()) { 1204 exec_node *node = actual_parameters.head; 1205 for (unsigned i = 0; i < type->length; i++) { 1206 ir_rvalue *ir = (ir_rvalue *) node; 1207 1208 if (node->is_tail_sentinel()) { 1209 _mesa_glsl_error(&loc, state, 1210 "insufficient parameters to constructor " 1211 "for `%s'", 1212 type->name); 1213 return ir_call::get_error_instruction(ctx); 1214 } 1215 1216 if (apply_implicit_conversion(type->fields.structure[i].type, ir, 1217 state)) { 1218 node->replace_with(ir); 1219 } else { 1220 _mesa_glsl_error(&loc, state, 1221 "parameter type mismatch in constructor " 1222 "for `%s.%s' (%s vs %s)", 1223 type->name, 1224 type->fields.structure[i].name, 1225 ir->type->name, 1226 type->fields.structure[i].type->name); 1227 return ir_call::get_error_instruction(ctx);; 1228 } 1229 1230 node = node->next; 1231 } 1232 1233 if (!node->is_tail_sentinel()) { 1234 _mesa_glsl_error(&loc, state, "too many parameters in constructor " 1235 "for `%s'", type->name); 1236 return ir_call::get_error_instruction(ctx); 1237 } 1238 1239 ir_rvalue *const constant = 1240 constant_record_constructor(type, &actual_parameters, state); 1241 1242 return (constant != NULL) 1243 ? constant 1244 : emit_inline_record_constructor(type, instructions, 1245 &actual_parameters, state); 1246 } 1247 1248 return match_function_by_name(instructions, 1249 id->primary_expression.identifier, & loc, 1250 &actual_parameters, state); 1251 } 1252 1253 return ir_call::get_error_instruction(ctx); 1254 } 1255
