2 * Copyright © 2010 Intel Corporation
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:
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
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.
24 #include "glsl_symbol_table.h"
26 #include "glsl_types.h"
28 #include "main/core.h" /* for MIN2 */
31 convert_component(ir_rvalue
*src
, const glsl_type
*desired_type
);
34 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
35 struct _mesa_glsl_parse_state
*state
);
38 process_parameters(exec_list
*instructions
, exec_list
*actual_parameters
,
39 exec_list
*parameters
,
40 struct _mesa_glsl_parse_state
*state
)
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
);
48 ir_constant
*const constant
= result
->constant_expression_value();
52 actual_parameters
->push_tail(result
);
61 * Generate a source prototype for a function signature
63 * \param return_type Return type of the function. May be \c NULL.
64 * \param name Name of the function.
65 * \param parameters List of \c ir_instruction nodes representing the
66 * parameter list for the function. This may be either a
67 * formal (\c ir_variable) or actual (\c ir_rvalue)
68 * parameter list. Only the type is used.
71 * A ralloced string representing the prototype of the function.
74 prototype_string(const glsl_type
*return_type
, const char *name
,
75 exec_list
*parameters
)
79 if (return_type
!= NULL
)
80 str
= ralloc_asprintf(NULL
, "%s ", return_type
->name
);
82 ralloc_asprintf_append(&str
, "%s(", name
);
84 const char *comma
= "";
85 foreach_list(node
, parameters
) {
86 const ir_variable
*const param
= (ir_variable
*) node
;
88 ralloc_asprintf_append(&str
, "%s%s", comma
, param
->type
->name
);
92 ralloc_strcat(&str
, ")");
97 * Verify that 'out' and 'inout' actual parameters are lvalues. Also, verify
98 * that 'const_in' formal parameters (an extension in our IR) correspond to
99 * ir_constant actual parameters.
102 verify_parameter_modes(_mesa_glsl_parse_state
*state
,
103 ir_function_signature
*sig
,
104 exec_list
&actual_ir_parameters
,
105 exec_list
&actual_ast_parameters
)
107 exec_node
*actual_ir_node
= actual_ir_parameters
.head
;
108 exec_node
*actual_ast_node
= actual_ast_parameters
.head
;
110 foreach_list(formal_node
, &sig
->parameters
) {
111 /* The lists must be the same length. */
112 assert(!actual_ir_node
->is_tail_sentinel());
113 assert(!actual_ast_node
->is_tail_sentinel());
115 const ir_variable
*const formal
= (ir_variable
*) formal_node
;
116 const ir_rvalue
*const actual
= (ir_rvalue
*) actual_ir_node
;
117 const ast_expression
*const actual_ast
=
118 exec_node_data(ast_expression
, actual_ast_node
, link
);
120 /* FIXME: 'loc' is incorrect (as of 2011-01-21). It is always
123 YYLTYPE loc
= actual_ast
->get_location();
125 /* Verify that 'const_in' parameters are ir_constants. */
126 if (formal
->mode
== ir_var_const_in
&&
127 actual
->ir_type
!= ir_type_constant
) {
128 _mesa_glsl_error(&loc
, state
,
129 "parameter `in %s' must be a constant expression",
134 /* Verify that 'out' and 'inout' actual parameters are lvalues. */
135 if (formal
->mode
== ir_var_function_out
136 || formal
->mode
== ir_var_function_inout
) {
137 const char *mode
= NULL
;
138 switch (formal
->mode
) {
139 case ir_var_function_out
: mode
= "out"; break;
140 case ir_var_function_inout
: mode
= "inout"; break;
141 default: assert(false); break;
144 /* This AST-based check catches errors like f(i++). The IR-based
145 * is_lvalue() is insufficient because the actual parameter at the
146 * IR-level is just a temporary value, which is an l-value.
148 if (actual_ast
->non_lvalue_description
!= NULL
) {
149 _mesa_glsl_error(&loc
, state
,
150 "function parameter '%s %s' references a %s",
152 actual_ast
->non_lvalue_description
);
156 ir_variable
*var
= actual
->variable_referenced();
158 var
->assigned
= true;
160 if (var
&& var
->read_only
) {
161 _mesa_glsl_error(&loc
, state
,
162 "function parameter '%s %s' references the "
163 "read-only variable '%s'",
165 actual
->variable_referenced()->name
);
167 } else if (!actual
->is_lvalue()) {
168 /* Even though ir_binop_vector_extract is not an l-value, let it
169 * slop through. generate_call will handle it correctly.
171 ir_expression
*const expr
= ((ir_rvalue
*) actual
)->as_expression();
173 || expr
->operation
!= ir_binop_vector_extract
174 || !expr
->operands
[0]->is_lvalue()) {
175 _mesa_glsl_error(&loc
, state
,
176 "function parameter '%s %s' is not an lvalue",
183 actual_ir_node
= actual_ir_node
->next
;
184 actual_ast_node
= actual_ast_node
->next
;
190 fix_parameter(void *mem_ctx
, ir_rvalue
*actual
, const glsl_type
*formal_type
,
191 exec_list
*before_instructions
, exec_list
*after_instructions
,
192 bool parameter_is_inout
)
194 ir_expression
*const expr
= actual
->as_expression();
196 /* If the types match exactly and the parameter is not a vector-extract,
197 * nothing needs to be done to fix the parameter.
199 if (formal_type
== actual
->type
200 && (expr
== NULL
|| expr
->operation
!= ir_binop_vector_extract
))
203 /* To convert an out parameter, we need to create a temporary variable to
204 * hold the value before conversion, and then perform the conversion after
205 * the function call returns.
207 * This has the effect of transforming code like this:
213 * Into IR that's equivalent to this:
217 * int out_parameter_conversion;
218 * f(out_parameter_conversion);
219 * value = float(out_parameter_conversion);
221 * If the parameter is an ir_expression of ir_binop_vector_extract,
222 * additional conversion is needed in the post-call re-write.
225 new(mem_ctx
) ir_variable(formal_type
, "inout_tmp", ir_var_temporary
);
227 before_instructions
->push_tail(tmp
);
229 /* If the parameter is an inout parameter, copy the value of the actual
230 * parameter to the new temporary. Note that no type conversion is allowed
231 * here because inout parameters must match types exactly.
233 if (parameter_is_inout
) {
234 /* Inout parameters should never require conversion, since that would
235 * require an implicit conversion to exist both to and from the formal
236 * parameter type, and there are no bidirectional implicit conversions.
238 assert (actual
->type
== formal_type
);
240 ir_dereference_variable
*const deref_tmp_1
=
241 new(mem_ctx
) ir_dereference_variable(tmp
);
242 ir_assignment
*const assignment
=
243 new(mem_ctx
) ir_assignment(deref_tmp_1
, actual
);
244 before_instructions
->push_tail(assignment
);
247 /* Replace the parameter in the call with a dereference of the new
250 ir_dereference_variable
*const deref_tmp_2
=
251 new(mem_ctx
) ir_dereference_variable(tmp
);
252 actual
->replace_with(deref_tmp_2
);
255 /* Copy the temporary variable to the actual parameter with optional
256 * type conversion applied.
258 ir_rvalue
*rhs
= new(mem_ctx
) ir_dereference_variable(tmp
);
259 if (actual
->type
!= formal_type
)
260 rhs
= convert_component(rhs
, actual
->type
);
262 ir_rvalue
*lhs
= actual
;
263 if (expr
!= NULL
&& expr
->operation
== ir_binop_vector_extract
) {
264 rhs
= new(mem_ctx
) ir_expression(ir_triop_vector_insert
,
265 expr
->operands
[0]->type
,
266 expr
->operands
[0]->clone(mem_ctx
, NULL
),
268 expr
->operands
[1]->clone(mem_ctx
, NULL
));
269 lhs
= expr
->operands
[0]->clone(mem_ctx
, NULL
);
272 ir_assignment
*const assignment_2
= new(mem_ctx
) ir_assignment(lhs
, rhs
);
273 after_instructions
->push_tail(assignment_2
);
277 * Generate a function call.
279 * For non-void functions, this returns a dereference of the temporary variable
280 * which stores the return value for the call. For void functions, this returns
284 generate_call(exec_list
*instructions
, ir_function_signature
*sig
,
285 exec_list
*actual_parameters
,
286 struct _mesa_glsl_parse_state
*state
)
289 exec_list post_call_conversions
;
291 /* Perform implicit conversion of arguments. For out parameters, we need
292 * to place them in a temporary variable and do the conversion after the
293 * call takes place. Since we haven't emitted the call yet, we'll place
294 * the post-call conversions in a temporary exec_list, and emit them later.
296 exec_list_iterator actual_iter
= actual_parameters
->iterator();
297 exec_list_iterator formal_iter
= sig
->parameters
.iterator();
299 while (actual_iter
.has_next()) {
300 ir_rvalue
*actual
= (ir_rvalue
*) actual_iter
.get();
301 ir_variable
*formal
= (ir_variable
*) formal_iter
.get();
303 assert(actual
!= NULL
);
304 assert(formal
!= NULL
);
306 if (formal
->type
->is_numeric() || formal
->type
->is_boolean()) {
307 switch (formal
->mode
) {
308 case ir_var_const_in
:
309 case ir_var_function_in
: {
311 = convert_component(actual
, formal
->type
);
312 actual
->replace_with(converted
);
315 case ir_var_function_out
:
316 case ir_var_function_inout
:
317 fix_parameter(ctx
, actual
, formal
->type
,
318 instructions
, &post_call_conversions
,
319 formal
->mode
== ir_var_function_inout
);
322 assert (!"Illegal formal parameter mode");
331 /* If the function call is a constant expression, don't generate any
332 * instructions; just generate an ir_constant.
334 * Function calls were first allowed to be constant expressions in GLSL
335 * 1.20 and GLSL ES 3.00.
337 if (state
->is_version(120, 300)) {
338 ir_constant
*value
= sig
->constant_expression_value(actual_parameters
, NULL
);
344 ir_dereference_variable
*deref
= NULL
;
345 if (!sig
->return_type
->is_void()) {
346 /* Create a new temporary to hold the return value. */
349 var
= new(ctx
) ir_variable(sig
->return_type
,
350 ralloc_asprintf(ctx
, "%s_retval",
351 sig
->function_name()),
353 instructions
->push_tail(var
);
355 deref
= new(ctx
) ir_dereference_variable(var
);
357 ir_call
*call
= new(ctx
) ir_call(sig
, deref
, actual_parameters
);
358 instructions
->push_tail(call
);
360 /* Also emit any necessary out-parameter conversions. */
361 instructions
->append_list(&post_call_conversions
);
363 return deref
? deref
->clone(ctx
, NULL
) : NULL
;
367 * Given a function name and parameter list, find the matching signature.
369 static ir_function_signature
*
370 match_function_by_name(const char *name
,
371 exec_list
*actual_parameters
,
372 struct _mesa_glsl_parse_state
*state
)
375 ir_function
*f
= state
->symbols
->get_function(name
);
376 ir_function_signature
*local_sig
= NULL
;
377 ir_function_signature
*sig
= NULL
;
379 /* Is the function hidden by a record type constructor? */
380 if (state
->symbols
->get_type(name
))
381 goto done
; /* no match */
383 /* Is the function hidden by a variable (impossible in 1.10)? */
384 if (!state
->symbols
->separate_function_namespace
385 && state
->symbols
->get_variable(name
))
386 goto done
; /* no match */
389 /* Look for a match in the local shader. If exact, we're done. */
390 bool is_exact
= false;
391 sig
= local_sig
= f
->matching_signature(state
, actual_parameters
,
396 if (!state
->es_shader
&& f
->has_user_signature()) {
397 /* In desktop GL, the presence of a user-defined signature hides any
398 * built-in signatures, so we must ignore them. In contrast, in ES2
399 * user-defined signatures add new overloads, so we must proceed.
405 /* Local shader has no exact candidates; check the built-ins. */
406 _mesa_glsl_initialize_builtin_functions();
407 sig
= _mesa_glsl_find_builtin_function(state
, name
, actual_parameters
);
411 /* If the match is from a linked built-in shader, import the prototype. */
412 if (sig
!= local_sig
) {
414 f
= new(ctx
) ir_function(name
);
415 state
->symbols
->add_global_function(f
);
416 emit_function(state
, f
);
418 f
->add_signature(sig
->clone_prototype(f
, NULL
));
425 * Raise a "no matching function" error, listing all possible overloads the
426 * compiler considered so developers can figure out what went wrong.
429 no_matching_function_error(const char *name
,
431 exec_list
*actual_parameters
,
432 _mesa_glsl_parse_state
*state
)
434 char *str
= prototype_string(NULL
, name
, actual_parameters
);
435 _mesa_glsl_error(loc
, state
,
436 "no matching function for call to `%s'; candidates are:",
440 for (int i
= -1; i
< (int) state
->num_builtins_to_link
; i
++) {
441 glsl_symbol_table
*syms
= i
>= 0 ? state
->builtins_to_link
[i
]->symbols
443 ir_function
*f
= syms
->get_function(name
);
447 foreach_list (node
, &f
->signatures
) {
448 ir_function_signature
*sig
= (ir_function_signature
*) node
;
450 if (sig
->is_builtin() && !sig
->is_builtin_available(state
))
453 str
= prototype_string(sig
->return_type
, f
->name
, &sig
->parameters
);
454 _mesa_glsl_error(loc
, state
, " %s", str
);
461 * Perform automatic type conversion of constructor parameters
463 * This implements the rules in the "Conversion and Scalar Constructors"
464 * section (GLSL 1.10 section 5.4.1), not the "Implicit Conversions" rules.
467 convert_component(ir_rvalue
*src
, const glsl_type
*desired_type
)
469 void *ctx
= ralloc_parent(src
);
470 const unsigned a
= desired_type
->base_type
;
471 const unsigned b
= src
->type
->base_type
;
472 ir_expression
*result
= NULL
;
474 if (src
->type
->is_error())
477 assert(a
<= GLSL_TYPE_BOOL
);
478 assert(b
<= GLSL_TYPE_BOOL
);
487 result
= new(ctx
) ir_expression(ir_unop_i2u
, src
);
489 case GLSL_TYPE_FLOAT
:
490 result
= new(ctx
) ir_expression(ir_unop_f2u
, src
);
493 result
= new(ctx
) ir_expression(ir_unop_i2u
,
494 new(ctx
) ir_expression(ir_unop_b2i
, src
));
501 result
= new(ctx
) ir_expression(ir_unop_u2i
, src
);
503 case GLSL_TYPE_FLOAT
:
504 result
= new(ctx
) ir_expression(ir_unop_f2i
, src
);
507 result
= new(ctx
) ir_expression(ir_unop_b2i
, src
);
511 case GLSL_TYPE_FLOAT
:
514 result
= new(ctx
) ir_expression(ir_unop_u2f
, desired_type
, src
, NULL
);
517 result
= new(ctx
) ir_expression(ir_unop_i2f
, desired_type
, src
, NULL
);
520 result
= new(ctx
) ir_expression(ir_unop_b2f
, desired_type
, src
, NULL
);
527 result
= new(ctx
) ir_expression(ir_unop_i2b
,
528 new(ctx
) ir_expression(ir_unop_u2i
, src
));
531 result
= new(ctx
) ir_expression(ir_unop_i2b
, desired_type
, src
, NULL
);
533 case GLSL_TYPE_FLOAT
:
534 result
= new(ctx
) ir_expression(ir_unop_f2b
, desired_type
, src
, NULL
);
540 assert(result
!= NULL
);
541 assert(result
->type
== desired_type
);
543 /* Try constant folding; it may fold in the conversion we just added. */
544 ir_constant
*const constant
= result
->constant_expression_value();
545 return (constant
!= NULL
) ? (ir_rvalue
*) constant
: (ir_rvalue
*) result
;
549 * Dereference a specific component from a scalar, vector, or matrix
552 dereference_component(ir_rvalue
*src
, unsigned component
)
554 void *ctx
= ralloc_parent(src
);
555 assert(component
< src
->type
->components());
557 /* If the source is a constant, just create a new constant instead of a
558 * dereference of the existing constant.
560 ir_constant
*constant
= src
->as_constant();
562 return new(ctx
) ir_constant(constant
, component
);
564 if (src
->type
->is_scalar()) {
566 } else if (src
->type
->is_vector()) {
567 return new(ctx
) ir_swizzle(src
, component
, 0, 0, 0, 1);
569 assert(src
->type
->is_matrix());
571 /* Dereference a row of the matrix, then call this function again to get
572 * a specific element from that row.
574 const int c
= component
/ src
->type
->column_type()->vector_elements
;
575 const int r
= component
% src
->type
->column_type()->vector_elements
;
576 ir_constant
*const col_index
= new(ctx
) ir_constant(c
);
577 ir_dereference
*const col
= new(ctx
) ir_dereference_array(src
, col_index
);
579 col
->type
= src
->type
->column_type();
581 return dereference_component(col
, r
);
584 assert(!"Should not get here.");
590 process_vec_mat_constructor(exec_list
*instructions
,
591 const glsl_type
*constructor_type
,
592 YYLTYPE
*loc
, exec_list
*parameters
,
593 struct _mesa_glsl_parse_state
*state
)
597 /* The ARB_shading_language_420pack spec says:
599 * "If an initializer is a list of initializers enclosed in curly braces,
600 * the variable being declared must be a vector, a matrix, an array, or a
603 * int i = { 1 }; // illegal, i is not an aggregate"
605 if (constructor_type
->vector_elements
<= 1) {
606 _mesa_glsl_error(loc
, state
, "aggregates can only initialize vectors, "
607 "matrices, arrays, and structs");
608 return ir_rvalue::error_value(ctx
);
611 exec_list actual_parameters
;
612 const unsigned parameter_count
=
613 process_parameters(instructions
, &actual_parameters
, parameters
, state
);
615 if (parameter_count
== 0
616 || (constructor_type
->is_vector() &&
617 constructor_type
->vector_elements
!= parameter_count
)
618 || (constructor_type
->is_matrix() &&
619 constructor_type
->matrix_columns
!= parameter_count
)) {
620 _mesa_glsl_error(loc
, state
, "%s constructor must have %u parameters",
621 constructor_type
->is_vector() ? "vector" : "matrix",
622 constructor_type
->vector_elements
);
623 return ir_rvalue::error_value(ctx
);
626 bool all_parameters_are_constant
= true;
628 /* Type cast each parameter and, if possible, fold constants. */
629 foreach_list_safe(n
, &actual_parameters
) {
630 ir_rvalue
*ir
= (ir_rvalue
*) n
;
631 ir_rvalue
*result
= ir
;
633 /* Apply implicit conversions (not the scalar constructor rules!). See
634 * the spec quote above. */
635 if (constructor_type
->is_float()) {
636 const glsl_type
*desired_type
=
637 glsl_type::get_instance(GLSL_TYPE_FLOAT
,
638 ir
->type
->vector_elements
,
639 ir
->type
->matrix_columns
);
640 if (result
->type
->can_implicitly_convert_to(desired_type
)) {
641 /* Even though convert_component() implements the constructor
642 * conversion rules (not the implicit conversion rules), its safe
643 * to use it here because we already checked that the implicit
644 * conversion is legal.
646 result
= convert_component(ir
, desired_type
);
650 if (constructor_type
->is_matrix()) {
651 if (result
->type
!= constructor_type
->column_type()) {
652 _mesa_glsl_error(loc
, state
, "type error in matrix constructor: "
653 "expected: %s, found %s",
654 constructor_type
->column_type()->name
,
656 return ir_rvalue::error_value(ctx
);
658 } else if (result
->type
!= constructor_type
->get_scalar_type()) {
659 _mesa_glsl_error(loc
, state
, "type error in vector constructor: "
660 "expected: %s, found %s",
661 constructor_type
->get_scalar_type()->name
,
663 return ir_rvalue::error_value(ctx
);
666 /* Attempt to convert the parameter to a constant valued expression.
667 * After doing so, track whether or not all the parameters to the
668 * constructor are trivially constant valued expressions.
670 ir_rvalue
*const constant
= result
->constant_expression_value();
672 if (constant
!= NULL
)
675 all_parameters_are_constant
= false;
677 ir
->replace_with(result
);
680 if (all_parameters_are_constant
)
681 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
683 ir_variable
*var
= new(ctx
) ir_variable(constructor_type
, "vec_mat_ctor",
685 instructions
->push_tail(var
);
688 foreach_list(node
, &actual_parameters
) {
689 ir_rvalue
*rhs
= (ir_rvalue
*) node
;
690 ir_rvalue
*lhs
= new(ctx
) ir_dereference_array(var
,
691 new(ctx
) ir_constant(i
));
693 ir_instruction
*assignment
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
694 instructions
->push_tail(assignment
);
699 return new(ctx
) ir_dereference_variable(var
);
704 process_array_constructor(exec_list
*instructions
,
705 const glsl_type
*constructor_type
,
706 YYLTYPE
*loc
, exec_list
*parameters
,
707 struct _mesa_glsl_parse_state
*state
)
710 /* Array constructors come in two forms: sized and unsized. Sized array
711 * constructors look like 'vec4[2](a, b)', where 'a' and 'b' are vec4
712 * variables. In this case the number of parameters must exactly match the
713 * specified size of the array.
715 * Unsized array constructors look like 'vec4[](a, b)', where 'a' and 'b'
716 * are vec4 variables. In this case the size of the array being constructed
717 * is determined by the number of parameters.
719 * From page 52 (page 58 of the PDF) of the GLSL 1.50 spec:
721 * "There must be exactly the same number of arguments as the size of
722 * the array being constructed. If no size is present in the
723 * constructor, then the array is explicitly sized to the number of
724 * arguments provided. The arguments are assigned in order, starting at
725 * element 0, to the elements of the constructed array. Each argument
726 * must be the same type as the element type of the array, or be a type
727 * that can be converted to the element type of the array according to
728 * Section 4.1.10 "Implicit Conversions.""
730 exec_list actual_parameters
;
731 const unsigned parameter_count
=
732 process_parameters(instructions
, &actual_parameters
, parameters
, state
);
733 bool is_unsized_array
= constructor_type
->is_unsized_array();
735 if ((parameter_count
== 0) ||
736 (!is_unsized_array
&& (constructor_type
->length
!= parameter_count
))) {
737 const unsigned min_param
= is_unsized_array
738 ? 1 : constructor_type
->length
;
740 _mesa_glsl_error(loc
, state
, "array constructor must have %s %u "
742 is_unsized_array
? "at least" : "exactly",
743 min_param
, (min_param
<= 1) ? "" : "s");
744 return ir_rvalue::error_value(ctx
);
747 if (is_unsized_array
) {
749 glsl_type::get_array_instance(constructor_type
->element_type(),
751 assert(constructor_type
!= NULL
);
752 assert(constructor_type
->length
== parameter_count
);
755 bool all_parameters_are_constant
= true;
757 /* Type cast each parameter and, if possible, fold constants. */
758 foreach_list_safe(n
, &actual_parameters
) {
759 ir_rvalue
*ir
= (ir_rvalue
*) n
;
760 ir_rvalue
*result
= ir
;
762 /* Apply implicit conversions (not the scalar constructor rules!). See
763 * the spec quote above. */
764 if (constructor_type
->element_type()->is_float()) {
765 const glsl_type
*desired_type
=
766 glsl_type::get_instance(GLSL_TYPE_FLOAT
,
767 ir
->type
->vector_elements
,
768 ir
->type
->matrix_columns
);
769 if (result
->type
->can_implicitly_convert_to(desired_type
)) {
770 /* Even though convert_component() implements the constructor
771 * conversion rules (not the implicit conversion rules), its safe
772 * to use it here because we already checked that the implicit
773 * conversion is legal.
775 result
= convert_component(ir
, desired_type
);
779 if (result
->type
!= constructor_type
->element_type()) {
780 _mesa_glsl_error(loc
, state
, "type error in array constructor: "
781 "expected: %s, found %s",
782 constructor_type
->element_type()->name
,
784 return ir_rvalue::error_value(ctx
);
787 /* Attempt to convert the parameter to a constant valued expression.
788 * After doing so, track whether or not all the parameters to the
789 * constructor are trivially constant valued expressions.
791 ir_rvalue
*const constant
= result
->constant_expression_value();
793 if (constant
!= NULL
)
796 all_parameters_are_constant
= false;
798 ir
->replace_with(result
);
801 if (all_parameters_are_constant
)
802 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
804 ir_variable
*var
= new(ctx
) ir_variable(constructor_type
, "array_ctor",
806 instructions
->push_tail(var
);
809 foreach_list(node
, &actual_parameters
) {
810 ir_rvalue
*rhs
= (ir_rvalue
*) node
;
811 ir_rvalue
*lhs
= new(ctx
) ir_dereference_array(var
,
812 new(ctx
) ir_constant(i
));
814 ir_instruction
*assignment
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
815 instructions
->push_tail(assignment
);
820 return new(ctx
) ir_dereference_variable(var
);
825 * Try to convert a record constructor to a constant expression
828 constant_record_constructor(const glsl_type
*constructor_type
,
829 exec_list
*parameters
, void *mem_ctx
)
831 foreach_list(node
, parameters
) {
832 ir_constant
*constant
= ((ir_instruction
*) node
)->as_constant();
833 if (constant
== NULL
)
835 node
->replace_with(constant
);
838 return new(mem_ctx
) ir_constant(constructor_type
, parameters
);
843 * Determine if a list consists of a single scalar r-value
846 single_scalar_parameter(exec_list
*parameters
)
848 const ir_rvalue
*const p
= (ir_rvalue
*) parameters
->head
;
849 assert(((ir_rvalue
*)p
)->as_rvalue() != NULL
);
851 return (p
->type
->is_scalar() && p
->next
->is_tail_sentinel());
856 * Generate inline code for a vector constructor
858 * The generated constructor code will consist of a temporary variable
859 * declaration of the same type as the constructor. A sequence of assignments
860 * from constructor parameters to the temporary will follow.
863 * An \c ir_dereference_variable of the temprorary generated in the constructor
867 emit_inline_vector_constructor(const glsl_type
*type
,
868 exec_list
*instructions
,
869 exec_list
*parameters
,
872 assert(!parameters
->is_empty());
874 ir_variable
*var
= new(ctx
) ir_variable(type
, "vec_ctor", ir_var_temporary
);
875 instructions
->push_tail(var
);
877 /* There are two kinds of vector constructors.
879 * - Construct a vector from a single scalar by replicating that scalar to
880 * all components of the vector.
882 * - Construct a vector from an arbirary combination of vectors and
883 * scalars. The components of the constructor parameters are assigned
884 * to the vector in order until the vector is full.
886 const unsigned lhs_components
= type
->components();
887 if (single_scalar_parameter(parameters
)) {
888 ir_rvalue
*first_param
= (ir_rvalue
*)parameters
->head
;
889 ir_rvalue
*rhs
= new(ctx
) ir_swizzle(first_param
, 0, 0, 0, 0,
891 ir_dereference_variable
*lhs
= new(ctx
) ir_dereference_variable(var
);
892 const unsigned mask
= (1U << lhs_components
) - 1;
894 assert(rhs
->type
== lhs
->type
);
896 ir_instruction
*inst
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
, mask
);
897 instructions
->push_tail(inst
);
899 unsigned base_component
= 0;
900 unsigned base_lhs_component
= 0;
901 ir_constant_data data
;
902 unsigned constant_mask
= 0, constant_components
= 0;
904 memset(&data
, 0, sizeof(data
));
906 foreach_list(node
, parameters
) {
907 ir_rvalue
*param
= (ir_rvalue
*) node
;
908 unsigned rhs_components
= param
->type
->components();
910 /* Do not try to assign more components to the vector than it has!
912 if ((rhs_components
+ base_lhs_component
) > lhs_components
) {
913 rhs_components
= lhs_components
- base_lhs_component
;
916 const ir_constant
*const c
= param
->as_constant();
918 for (unsigned i
= 0; i
< rhs_components
; i
++) {
919 switch (c
->type
->base_type
) {
921 data
.u
[i
+ base_component
] = c
->get_uint_component(i
);
924 data
.i
[i
+ base_component
] = c
->get_int_component(i
);
926 case GLSL_TYPE_FLOAT
:
927 data
.f
[i
+ base_component
] = c
->get_float_component(i
);
930 data
.b
[i
+ base_component
] = c
->get_bool_component(i
);
933 assert(!"Should not get here.");
938 /* Mask of fields to be written in the assignment.
940 constant_mask
|= ((1U << rhs_components
) - 1) << base_lhs_component
;
941 constant_components
+= rhs_components
;
943 base_component
+= rhs_components
;
945 /* Advance the component index by the number of components
946 * that were just assigned.
948 base_lhs_component
+= rhs_components
;
951 if (constant_mask
!= 0) {
952 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
953 const glsl_type
*rhs_type
= glsl_type::get_instance(var
->type
->base_type
,
956 ir_rvalue
*rhs
= new(ctx
) ir_constant(rhs_type
, &data
);
958 ir_instruction
*inst
=
959 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, constant_mask
);
960 instructions
->push_tail(inst
);
964 foreach_list(node
, parameters
) {
965 ir_rvalue
*param
= (ir_rvalue
*) node
;
966 unsigned rhs_components
= param
->type
->components();
968 /* Do not try to assign more components to the vector than it has!
970 if ((rhs_components
+ base_component
) > lhs_components
) {
971 rhs_components
= lhs_components
- base_component
;
974 const ir_constant
*const c
= param
->as_constant();
976 /* Mask of fields to be written in the assignment.
978 const unsigned write_mask
= ((1U << rhs_components
) - 1)
981 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
983 /* Generate a swizzle so that LHS and RHS sizes match.
986 new(ctx
) ir_swizzle(param
, 0, 1, 2, 3, rhs_components
);
988 ir_instruction
*inst
=
989 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, write_mask
);
990 instructions
->push_tail(inst
);
993 /* Advance the component index by the number of components that were
996 base_component
+= rhs_components
;
999 return new(ctx
) ir_dereference_variable(var
);
1004 * Generate assignment of a portion of a vector to a portion of a matrix column
1006 * \param src_base First component of the source to be used in assignment
1007 * \param column Column of destination to be assiged
1008 * \param row_base First component of the destination column to be assigned
1009 * \param count Number of components to be assigned
1012 * \c src_base + \c count must be less than or equal to the number of components
1013 * in the source vector.
1016 assign_to_matrix_column(ir_variable
*var
, unsigned column
, unsigned row_base
,
1017 ir_rvalue
*src
, unsigned src_base
, unsigned count
,
1020 ir_constant
*col_idx
= new(mem_ctx
) ir_constant(column
);
1021 ir_dereference
*column_ref
= new(mem_ctx
) ir_dereference_array(var
, col_idx
);
1023 assert(column_ref
->type
->components() >= (row_base
+ count
));
1024 assert(src
->type
->components() >= (src_base
+ count
));
1026 /* Generate a swizzle that extracts the number of components from the source
1027 * that are to be assigned to the column of the matrix.
1029 if (count
< src
->type
->vector_elements
) {
1030 src
= new(mem_ctx
) ir_swizzle(src
,
1031 src_base
+ 0, src_base
+ 1,
1032 src_base
+ 2, src_base
+ 3,
1036 /* Mask of fields to be written in the assignment.
1038 const unsigned write_mask
= ((1U << count
) - 1) << row_base
;
1040 return new(mem_ctx
) ir_assignment(column_ref
, src
, NULL
, write_mask
);
1045 * Generate inline code for a matrix constructor
1047 * The generated constructor code will consist of a temporary variable
1048 * declaration of the same type as the constructor. A sequence of assignments
1049 * from constructor parameters to the temporary will follow.
1052 * An \c ir_dereference_variable of the temprorary generated in the constructor
1056 emit_inline_matrix_constructor(const glsl_type
*type
,
1057 exec_list
*instructions
,
1058 exec_list
*parameters
,
1061 assert(!parameters
->is_empty());
1063 ir_variable
*var
= new(ctx
) ir_variable(type
, "mat_ctor", ir_var_temporary
);
1064 instructions
->push_tail(var
);
1066 /* There are three kinds of matrix constructors.
1068 * - Construct a matrix from a single scalar by replicating that scalar to
1069 * along the diagonal of the matrix and setting all other components to
1072 * - Construct a matrix from an arbirary combination of vectors and
1073 * scalars. The components of the constructor parameters are assigned
1074 * to the matrix in colum-major order until the matrix is full.
1076 * - Construct a matrix from a single matrix. The source matrix is copied
1077 * to the upper left portion of the constructed matrix, and the remaining
1078 * elements take values from the identity matrix.
1080 ir_rvalue
*const first_param
= (ir_rvalue
*) parameters
->head
;
1081 if (single_scalar_parameter(parameters
)) {
1082 /* Assign the scalar to the X component of a vec4, and fill the remaining
1083 * components with zero.
1085 ir_variable
*rhs_var
=
1086 new(ctx
) ir_variable(glsl_type::vec4_type
, "mat_ctor_vec",
1088 instructions
->push_tail(rhs_var
);
1090 ir_constant_data zero
;
1096 ir_instruction
*inst
=
1097 new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(rhs_var
),
1098 new(ctx
) ir_constant(rhs_var
->type
, &zero
),
1100 instructions
->push_tail(inst
);
1102 ir_dereference
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1104 inst
= new(ctx
) ir_assignment(rhs_ref
, first_param
, NULL
, 0x01);
1105 instructions
->push_tail(inst
);
1107 /* Assign the temporary vector to each column of the destination matrix
1108 * with a swizzle that puts the X component on the diagonal of the
1109 * matrix. In some cases this may mean that the X component does not
1110 * get assigned into the column at all (i.e., when the matrix has more
1111 * columns than rows).
1113 static const unsigned rhs_swiz
[4][4] = {
1120 const unsigned cols_to_init
= MIN2(type
->matrix_columns
,
1121 type
->vector_elements
);
1122 for (unsigned i
= 0; i
< cols_to_init
; i
++) {
1123 ir_constant
*const col_idx
= new(ctx
) ir_constant(i
);
1124 ir_rvalue
*const col_ref
= new(ctx
) ir_dereference_array(var
, col_idx
);
1126 ir_rvalue
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1127 ir_rvalue
*const rhs
= new(ctx
) ir_swizzle(rhs_ref
, rhs_swiz
[i
],
1128 type
->vector_elements
);
1130 inst
= new(ctx
) ir_assignment(col_ref
, rhs
, NULL
);
1131 instructions
->push_tail(inst
);
1134 for (unsigned i
= cols_to_init
; i
< type
->matrix_columns
; i
++) {
1135 ir_constant
*const col_idx
= new(ctx
) ir_constant(i
);
1136 ir_rvalue
*const col_ref
= new(ctx
) ir_dereference_array(var
, col_idx
);
1138 ir_rvalue
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1139 ir_rvalue
*const rhs
= new(ctx
) ir_swizzle(rhs_ref
, 1, 1, 1, 1,
1140 type
->vector_elements
);
1142 inst
= new(ctx
) ir_assignment(col_ref
, rhs
, NULL
);
1143 instructions
->push_tail(inst
);
1145 } else if (first_param
->type
->is_matrix()) {
1146 /* From page 50 (56 of the PDF) of the GLSL 1.50 spec:
1148 * "If a matrix is constructed from a matrix, then each component
1149 * (column i, row j) in the result that has a corresponding
1150 * component (column i, row j) in the argument will be initialized
1151 * from there. All other components will be initialized to the
1152 * identity matrix. If a matrix argument is given to a matrix
1153 * constructor, it is an error to have any other arguments."
1155 assert(first_param
->next
->is_tail_sentinel());
1156 ir_rvalue
*const src_matrix
= first_param
;
1158 /* If the source matrix is smaller, pre-initialize the relavent parts of
1159 * the destination matrix to the identity matrix.
1161 if ((src_matrix
->type
->matrix_columns
< var
->type
->matrix_columns
)
1162 || (src_matrix
->type
->vector_elements
< var
->type
->vector_elements
)) {
1164 /* If the source matrix has fewer rows, every column of the destination
1165 * must be initialized. Otherwise only the columns in the destination
1166 * that do not exist in the source must be initialized.
1169 (src_matrix
->type
->vector_elements
< var
->type
->vector_elements
)
1170 ? 0 : src_matrix
->type
->matrix_columns
;
1172 const glsl_type
*const col_type
= var
->type
->column_type();
1173 for (/* empty */; col
< var
->type
->matrix_columns
; col
++) {
1174 ir_constant_data ident
;
1183 ir_rvalue
*const rhs
= new(ctx
) ir_constant(col_type
, &ident
);
1185 ir_rvalue
*const lhs
=
1186 new(ctx
) ir_dereference_array(var
, new(ctx
) ir_constant(col
));
1188 ir_instruction
*inst
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
1189 instructions
->push_tail(inst
);
1193 /* Assign columns from the source matrix to the destination matrix.
1195 * Since the parameter will be used in the RHS of multiple assignments,
1196 * generate a temporary and copy the paramter there.
1198 ir_variable
*const rhs_var
=
1199 new(ctx
) ir_variable(first_param
->type
, "mat_ctor_mat",
1201 instructions
->push_tail(rhs_var
);
1203 ir_dereference
*const rhs_var_ref
=
1204 new(ctx
) ir_dereference_variable(rhs_var
);
1205 ir_instruction
*const inst
=
1206 new(ctx
) ir_assignment(rhs_var_ref
, first_param
, NULL
);
1207 instructions
->push_tail(inst
);
1209 const unsigned last_row
= MIN2(src_matrix
->type
->vector_elements
,
1210 var
->type
->vector_elements
);
1211 const unsigned last_col
= MIN2(src_matrix
->type
->matrix_columns
,
1212 var
->type
->matrix_columns
);
1214 unsigned swiz
[4] = { 0, 0, 0, 0 };
1215 for (unsigned i
= 1; i
< last_row
; i
++)
1218 const unsigned write_mask
= (1U << last_row
) - 1;
1220 for (unsigned i
= 0; i
< last_col
; i
++) {
1221 ir_dereference
*const lhs
=
1222 new(ctx
) ir_dereference_array(var
, new(ctx
) ir_constant(i
));
1223 ir_rvalue
*const rhs_col
=
1224 new(ctx
) ir_dereference_array(rhs_var
, new(ctx
) ir_constant(i
));
1226 /* If one matrix has columns that are smaller than the columns of the
1227 * other matrix, wrap the column access of the larger with a swizzle
1228 * so that the LHS and RHS of the assignment have the same size (and
1229 * therefore have the same type).
1231 * It would be perfectly valid to unconditionally generate the
1232 * swizzles, this this will typically result in a more compact IR tree.
1235 if (lhs
->type
->vector_elements
!= rhs_col
->type
->vector_elements
) {
1236 rhs
= new(ctx
) ir_swizzle(rhs_col
, swiz
, last_row
);
1241 ir_instruction
*inst
=
1242 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, write_mask
);
1243 instructions
->push_tail(inst
);
1246 const unsigned cols
= type
->matrix_columns
;
1247 const unsigned rows
= type
->vector_elements
;
1248 unsigned col_idx
= 0;
1249 unsigned row_idx
= 0;
1251 foreach_list (node
, parameters
) {
1252 ir_rvalue
*const rhs
= (ir_rvalue
*) node
;
1253 const unsigned components_remaining_this_column
= rows
- row_idx
;
1254 unsigned rhs_components
= rhs
->type
->components();
1255 unsigned rhs_base
= 0;
1257 /* Since the parameter might be used in the RHS of two assignments,
1258 * generate a temporary and copy the paramter there.
1260 ir_variable
*rhs_var
=
1261 new(ctx
) ir_variable(rhs
->type
, "mat_ctor_vec", ir_var_temporary
);
1262 instructions
->push_tail(rhs_var
);
1264 ir_dereference
*rhs_var_ref
=
1265 new(ctx
) ir_dereference_variable(rhs_var
);
1266 ir_instruction
*inst
= new(ctx
) ir_assignment(rhs_var_ref
, rhs
, NULL
);
1267 instructions
->push_tail(inst
);
1269 /* Assign the current parameter to as many components of the matrix
1272 * NOTE: A single vector parameter can span two matrix columns. A
1273 * single vec4, for example, can completely fill a mat2.
1275 if (rhs_components
>= components_remaining_this_column
) {
1276 const unsigned count
= MIN2(rhs_components
,
1277 components_remaining_this_column
);
1279 rhs_var_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1281 ir_instruction
*inst
= assign_to_matrix_column(var
, col_idx
,
1285 instructions
->push_tail(inst
);
1293 /* If there is data left in the parameter and components left to be
1294 * set in the destination, emit another assignment. It is possible
1295 * that the assignment could be of a vec4 to the last element of the
1296 * matrix. In this case col_idx==cols, but there is still data
1297 * left in the source parameter. Obviously, don't emit an assignment
1298 * to data outside the destination matrix.
1300 if ((col_idx
< cols
) && (rhs_base
< rhs_components
)) {
1301 const unsigned count
= rhs_components
- rhs_base
;
1303 rhs_var_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1305 ir_instruction
*inst
= assign_to_matrix_column(var
, col_idx
,
1310 instructions
->push_tail(inst
);
1317 return new(ctx
) ir_dereference_variable(var
);
1322 emit_inline_record_constructor(const glsl_type
*type
,
1323 exec_list
*instructions
,
1324 exec_list
*parameters
,
1327 ir_variable
*const var
=
1328 new(mem_ctx
) ir_variable(type
, "record_ctor", ir_var_temporary
);
1329 ir_dereference_variable
*const d
= new(mem_ctx
) ir_dereference_variable(var
);
1331 instructions
->push_tail(var
);
1333 exec_node
*node
= parameters
->head
;
1334 for (unsigned i
= 0; i
< type
->length
; i
++) {
1335 assert(!node
->is_tail_sentinel());
1337 ir_dereference
*const lhs
=
1338 new(mem_ctx
) ir_dereference_record(d
->clone(mem_ctx
, NULL
),
1339 type
->fields
.structure
[i
].name
);
1341 ir_rvalue
*const rhs
= ((ir_instruction
*) node
)->as_rvalue();
1342 assert(rhs
!= NULL
);
1344 ir_instruction
*const assign
= new(mem_ctx
) ir_assignment(lhs
, rhs
, NULL
);
1346 instructions
->push_tail(assign
);
1355 process_record_constructor(exec_list
*instructions
,
1356 const glsl_type
*constructor_type
,
1357 YYLTYPE
*loc
, exec_list
*parameters
,
1358 struct _mesa_glsl_parse_state
*state
)
1361 exec_list actual_parameters
;
1363 process_parameters(instructions
, &actual_parameters
,
1366 exec_node
*node
= actual_parameters
.head
;
1367 for (unsigned i
= 0; i
< constructor_type
->length
; i
++) {
1368 ir_rvalue
*ir
= (ir_rvalue
*) node
;
1370 if (node
->is_tail_sentinel()) {
1371 _mesa_glsl_error(loc
, state
,
1372 "insufficient parameters to constructor for `%s'",
1373 constructor_type
->name
);
1374 return ir_rvalue::error_value(ctx
);
1377 if (apply_implicit_conversion(constructor_type
->fields
.structure
[i
].type
,
1379 node
->replace_with(ir
);
1381 _mesa_glsl_error(loc
, state
,
1382 "parameter type mismatch in constructor for `%s.%s' "
1384 constructor_type
->name
,
1385 constructor_type
->fields
.structure
[i
].name
,
1387 constructor_type
->fields
.structure
[i
].type
->name
);
1388 return ir_rvalue::error_value(ctx
);;
1394 if (!node
->is_tail_sentinel()) {
1395 _mesa_glsl_error(loc
, state
, "too many parameters in constructor "
1396 "for `%s'", constructor_type
->name
);
1397 return ir_rvalue::error_value(ctx
);
1400 ir_rvalue
*const constant
=
1401 constant_record_constructor(constructor_type
, &actual_parameters
,
1404 return (constant
!= NULL
)
1406 : emit_inline_record_constructor(constructor_type
, instructions
,
1407 &actual_parameters
, state
);
1412 ast_function_expression::hir(exec_list
*instructions
,
1413 struct _mesa_glsl_parse_state
*state
)
1416 /* There are three sorts of function calls.
1418 * 1. constructors - The first subexpression is an ast_type_specifier.
1419 * 2. methods - Only the .length() method of array types.
1420 * 3. functions - Calls to regular old functions.
1422 * Method calls are actually detected when the ast_field_selection
1423 * expression is handled.
1425 if (is_constructor()) {
1426 const ast_type_specifier
*type
= (ast_type_specifier
*) subexpressions
[0];
1427 YYLTYPE loc
= type
->get_location();
1430 const glsl_type
*const constructor_type
= type
->glsl_type(& name
, state
);
1432 /* constructor_type can be NULL if a variable with the same name as the
1433 * structure has come into scope.
1435 if (constructor_type
== NULL
) {
1436 _mesa_glsl_error(& loc
, state
, "unknown type `%s' (structure name "
1437 "may be shadowed by a variable with the same name)",
1439 return ir_rvalue::error_value(ctx
);
1443 /* Constructors for samplers are illegal.
1445 if (constructor_type
->is_sampler()) {
1446 _mesa_glsl_error(& loc
, state
, "cannot construct sampler type `%s'",
1447 constructor_type
->name
);
1448 return ir_rvalue::error_value(ctx
);
1451 if (constructor_type
->is_array()) {
1452 if (!state
->check_version(120, 300, &loc
,
1453 "array constructors forbidden")) {
1454 return ir_rvalue::error_value(ctx
);
1457 return process_array_constructor(instructions
, constructor_type
,
1458 & loc
, &this->expressions
, state
);
1462 /* There are two kinds of constructor calls. Constructors for arrays and
1463 * structures must have the exact number of arguments with matching types
1464 * in the correct order. These constructors follow essentially the same
1465 * type matching rules as functions.
1467 * Constructors for built-in language types, such as mat4 and vec2, are
1468 * free form. The only requirements are that the parameters must provide
1469 * enough values of the correct scalar type and that no arguments are
1470 * given past the last used argument.
1472 * When using the C-style initializer syntax from GLSL 4.20, constructors
1473 * must have the exact number of arguments with matching types in the
1476 if (constructor_type
->is_record()) {
1477 return process_record_constructor(instructions
, constructor_type
,
1478 &loc
, &this->expressions
,
1482 if (!constructor_type
->is_numeric() && !constructor_type
->is_boolean())
1483 return ir_rvalue::error_value(ctx
);
1485 /* Total number of components of the type being constructed. */
1486 const unsigned type_components
= constructor_type
->components();
1488 /* Number of components from parameters that have actually been
1489 * consumed. This is used to perform several kinds of error checking.
1491 unsigned components_used
= 0;
1493 unsigned matrix_parameters
= 0;
1494 unsigned nonmatrix_parameters
= 0;
1495 exec_list actual_parameters
;
1497 foreach_list (n
, &this->expressions
) {
1498 ast_node
*ast
= exec_node_data(ast_node
, n
, link
);
1499 ir_rvalue
*result
= ast
->hir(instructions
, state
)->as_rvalue();
1501 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
1503 * "It is an error to provide extra arguments beyond this
1504 * last used argument."
1506 if (components_used
>= type_components
) {
1507 _mesa_glsl_error(& loc
, state
, "too many parameters to `%s' "
1509 constructor_type
->name
);
1510 return ir_rvalue::error_value(ctx
);
1513 if (!result
->type
->is_numeric() && !result
->type
->is_boolean()) {
1514 _mesa_glsl_error(& loc
, state
, "cannot construct `%s' from a "
1515 "non-numeric data type",
1516 constructor_type
->name
);
1517 return ir_rvalue::error_value(ctx
);
1520 /* Count the number of matrix and nonmatrix parameters. This
1521 * is used below to enforce some of the constructor rules.
1523 if (result
->type
->is_matrix())
1524 matrix_parameters
++;
1526 nonmatrix_parameters
++;
1528 actual_parameters
.push_tail(result
);
1529 components_used
+= result
->type
->components();
1532 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
1534 * "It is an error to construct matrices from other matrices. This
1535 * is reserved for future use."
1537 if (matrix_parameters
> 0
1538 && constructor_type
->is_matrix()
1539 && !state
->check_version(120, 100, &loc
,
1540 "cannot construct `%s' from a matrix",
1541 constructor_type
->name
)) {
1542 return ir_rvalue::error_value(ctx
);
1545 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
1547 * "If a matrix argument is given to a matrix constructor, it is
1548 * an error to have any other arguments."
1550 if ((matrix_parameters
> 0)
1551 && ((matrix_parameters
+ nonmatrix_parameters
) > 1)
1552 && constructor_type
->is_matrix()) {
1553 _mesa_glsl_error(& loc
, state
, "for matrix `%s' constructor, "
1554 "matrix must be only parameter",
1555 constructor_type
->name
);
1556 return ir_rvalue::error_value(ctx
);
1559 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
1561 * "In these cases, there must be enough components provided in the
1562 * arguments to provide an initializer for every component in the
1563 * constructed value."
1565 if (components_used
< type_components
&& components_used
!= 1
1566 && matrix_parameters
== 0) {
1567 _mesa_glsl_error(& loc
, state
, "too few components to construct "
1569 constructor_type
->name
);
1570 return ir_rvalue::error_value(ctx
);
1573 /* Later, we cast each parameter to the same base type as the
1574 * constructor. Since there are no non-floating point matrices, we
1575 * need to break them up into a series of column vectors.
1577 if (constructor_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1578 foreach_list_safe(n
, &actual_parameters
) {
1579 ir_rvalue
*matrix
= (ir_rvalue
*) n
;
1581 if (!matrix
->type
->is_matrix())
1584 /* Create a temporary containing the matrix. */
1585 ir_variable
*var
= new(ctx
) ir_variable(matrix
->type
, "matrix_tmp",
1587 instructions
->push_tail(var
);
1588 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
)
1589 ir_dereference_variable(var
), matrix
, NULL
));
1590 var
->constant_value
= matrix
->constant_expression_value();
1592 /* Replace the matrix with dereferences of its columns. */
1593 for (int i
= 0; i
< matrix
->type
->matrix_columns
; i
++) {
1594 matrix
->insert_before(new (ctx
) ir_dereference_array(var
,
1595 new(ctx
) ir_constant(i
)));
1601 bool all_parameters_are_constant
= true;
1603 /* Type cast each parameter and, if possible, fold constants.*/
1604 foreach_list_safe(n
, &actual_parameters
) {
1605 ir_rvalue
*ir
= (ir_rvalue
*) n
;
1607 const glsl_type
*desired_type
=
1608 glsl_type::get_instance(constructor_type
->base_type
,
1609 ir
->type
->vector_elements
,
1610 ir
->type
->matrix_columns
);
1611 ir_rvalue
*result
= convert_component(ir
, desired_type
);
1613 /* Attempt to convert the parameter to a constant valued expression.
1614 * After doing so, track whether or not all the parameters to the
1615 * constructor are trivially constant valued expressions.
1617 ir_rvalue
*const constant
= result
->constant_expression_value();
1619 if (constant
!= NULL
)
1622 all_parameters_are_constant
= false;
1625 ir
->replace_with(result
);
1629 /* If all of the parameters are trivially constant, create a
1630 * constant representing the complete collection of parameters.
1632 if (all_parameters_are_constant
) {
1633 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
1634 } else if (constructor_type
->is_scalar()) {
1635 return dereference_component((ir_rvalue
*) actual_parameters
.head
,
1637 } else if (constructor_type
->is_vector()) {
1638 return emit_inline_vector_constructor(constructor_type
,
1643 assert(constructor_type
->is_matrix());
1644 return emit_inline_matrix_constructor(constructor_type
,
1650 const ast_expression
*id
= subexpressions
[0];
1651 const char *func_name
= id
->primary_expression
.identifier
;
1652 YYLTYPE loc
= id
->get_location();
1653 exec_list actual_parameters
;
1655 process_parameters(instructions
, &actual_parameters
, &this->expressions
,
1658 ir_function_signature
*sig
=
1659 match_function_by_name(func_name
, &actual_parameters
, state
);
1661 ir_rvalue
*value
= NULL
;
1663 no_matching_function_error(func_name
, &loc
, &actual_parameters
, state
);
1664 value
= ir_rvalue::error_value(ctx
);
1665 } else if (!verify_parameter_modes(state
, sig
, actual_parameters
, this->expressions
)) {
1666 /* an error has already been emitted */
1667 value
= ir_rvalue::error_value(ctx
);
1669 value
= generate_call(instructions
, sig
, &actual_parameters
, state
);
1675 return ir_rvalue::error_value(ctx
);
1679 ast_aggregate_initializer::hir(exec_list
*instructions
,
1680 struct _mesa_glsl_parse_state
*state
)
1683 YYLTYPE loc
= this->get_location();
1686 if (!this->constructor_type
) {
1687 _mesa_glsl_error(&loc
, state
, "type of C-style initializer unknown");
1688 return ir_rvalue::error_value(ctx
);
1690 const glsl_type
*const constructor_type
=
1691 this->constructor_type
->glsl_type(&name
, state
);
1693 if (!state
->ARB_shading_language_420pack_enable
) {
1694 _mesa_glsl_error(&loc
, state
, "C-style initialization requires the "
1695 "GL_ARB_shading_language_420pack extension");
1696 return ir_rvalue::error_value(ctx
);
1699 if (this->constructor_type
->is_array
) {
1700 return process_array_constructor(instructions
, constructor_type
, &loc
,
1701 &this->expressions
, state
);
1704 if (this->constructor_type
->structure
) {
1705 return process_record_constructor(instructions
, constructor_type
, &loc
,
1706 &this->expressions
, state
);
1709 return process_vec_mat_constructor(instructions
, constructor_type
, &loc
,
1710 &this->expressions
, state
);