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
, "no matching function for call to `%s'", str
);
438 const char *prefix
= "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%s", prefix
, str
);
463 * Perform automatic type conversion of constructor parameters
465 * This implements the rules in the "Conversion and Scalar Constructors"
466 * section (GLSL 1.10 section 5.4.1), not the "Implicit Conversions" rules.
469 convert_component(ir_rvalue
*src
, const glsl_type
*desired_type
)
471 void *ctx
= ralloc_parent(src
);
472 const unsigned a
= desired_type
->base_type
;
473 const unsigned b
= src
->type
->base_type
;
474 ir_expression
*result
= NULL
;
476 if (src
->type
->is_error())
479 assert(a
<= GLSL_TYPE_BOOL
);
480 assert(b
<= GLSL_TYPE_BOOL
);
489 result
= new(ctx
) ir_expression(ir_unop_i2u
, src
);
491 case GLSL_TYPE_FLOAT
:
492 result
= new(ctx
) ir_expression(ir_unop_f2u
, src
);
495 result
= new(ctx
) ir_expression(ir_unop_i2u
,
496 new(ctx
) ir_expression(ir_unop_b2i
, src
));
503 result
= new(ctx
) ir_expression(ir_unop_u2i
, src
);
505 case GLSL_TYPE_FLOAT
:
506 result
= new(ctx
) ir_expression(ir_unop_f2i
, src
);
509 result
= new(ctx
) ir_expression(ir_unop_b2i
, src
);
513 case GLSL_TYPE_FLOAT
:
516 result
= new(ctx
) ir_expression(ir_unop_u2f
, desired_type
, src
, NULL
);
519 result
= new(ctx
) ir_expression(ir_unop_i2f
, desired_type
, src
, NULL
);
522 result
= new(ctx
) ir_expression(ir_unop_b2f
, desired_type
, src
, NULL
);
529 result
= new(ctx
) ir_expression(ir_unop_i2b
,
530 new(ctx
) ir_expression(ir_unop_u2i
, src
));
533 result
= new(ctx
) ir_expression(ir_unop_i2b
, desired_type
, src
, NULL
);
535 case GLSL_TYPE_FLOAT
:
536 result
= new(ctx
) ir_expression(ir_unop_f2b
, desired_type
, src
, NULL
);
542 assert(result
!= NULL
);
543 assert(result
->type
== desired_type
);
545 /* Try constant folding; it may fold in the conversion we just added. */
546 ir_constant
*const constant
= result
->constant_expression_value();
547 return (constant
!= NULL
) ? (ir_rvalue
*) constant
: (ir_rvalue
*) result
;
551 * Dereference a specific component from a scalar, vector, or matrix
554 dereference_component(ir_rvalue
*src
, unsigned component
)
556 void *ctx
= ralloc_parent(src
);
557 assert(component
< src
->type
->components());
559 /* If the source is a constant, just create a new constant instead of a
560 * dereference of the existing constant.
562 ir_constant
*constant
= src
->as_constant();
564 return new(ctx
) ir_constant(constant
, component
);
566 if (src
->type
->is_scalar()) {
568 } else if (src
->type
->is_vector()) {
569 return new(ctx
) ir_swizzle(src
, component
, 0, 0, 0, 1);
571 assert(src
->type
->is_matrix());
573 /* Dereference a row of the matrix, then call this function again to get
574 * a specific element from that row.
576 const int c
= component
/ src
->type
->column_type()->vector_elements
;
577 const int r
= component
% src
->type
->column_type()->vector_elements
;
578 ir_constant
*const col_index
= new(ctx
) ir_constant(c
);
579 ir_dereference
*const col
= new(ctx
) ir_dereference_array(src
, col_index
);
581 col
->type
= src
->type
->column_type();
583 return dereference_component(col
, r
);
586 assert(!"Should not get here.");
592 process_vec_mat_constructor(exec_list
*instructions
,
593 const glsl_type
*constructor_type
,
594 YYLTYPE
*loc
, exec_list
*parameters
,
595 struct _mesa_glsl_parse_state
*state
)
599 /* The ARB_shading_language_420pack spec says:
601 * "If an initializer is a list of initializers enclosed in curly braces,
602 * the variable being declared must be a vector, a matrix, an array, or a
605 * int i = { 1 }; // illegal, i is not an aggregate"
607 if (constructor_type
->vector_elements
<= 1) {
608 _mesa_glsl_error(loc
, state
, "aggregates can only initialize vectors, "
609 "matrices, arrays, and structs");
610 return ir_rvalue::error_value(ctx
);
613 exec_list actual_parameters
;
614 const unsigned parameter_count
=
615 process_parameters(instructions
, &actual_parameters
, parameters
, state
);
617 if (parameter_count
== 0
618 || (constructor_type
->is_vector() &&
619 constructor_type
->vector_elements
!= parameter_count
)
620 || (constructor_type
->is_matrix() &&
621 constructor_type
->matrix_columns
!= parameter_count
)) {
622 _mesa_glsl_error(loc
, state
, "%s constructor must have %u parameters",
623 constructor_type
->is_vector() ? "vector" : "matrix",
624 constructor_type
->vector_elements
);
625 return ir_rvalue::error_value(ctx
);
628 bool all_parameters_are_constant
= true;
630 /* Type cast each parameter and, if possible, fold constants. */
631 foreach_list_safe(n
, &actual_parameters
) {
632 ir_rvalue
*ir
= (ir_rvalue
*) n
;
633 ir_rvalue
*result
= ir
;
635 /* Apply implicit conversions (not the scalar constructor rules!). See
636 * the spec quote above. */
637 if (constructor_type
->is_float()) {
638 const glsl_type
*desired_type
=
639 glsl_type::get_instance(GLSL_TYPE_FLOAT
,
640 ir
->type
->vector_elements
,
641 ir
->type
->matrix_columns
);
642 if (result
->type
->can_implicitly_convert_to(desired_type
)) {
643 /* Even though convert_component() implements the constructor
644 * conversion rules (not the implicit conversion rules), its safe
645 * to use it here because we already checked that the implicit
646 * conversion is legal.
648 result
= convert_component(ir
, desired_type
);
652 if (constructor_type
->is_matrix()) {
653 if (result
->type
!= constructor_type
->column_type()) {
654 _mesa_glsl_error(loc
, state
, "type error in matrix constructor: "
655 "expected: %s, found %s",
656 constructor_type
->column_type()->name
,
658 return ir_rvalue::error_value(ctx
);
660 } else if (result
->type
!= constructor_type
->get_scalar_type()) {
661 _mesa_glsl_error(loc
, state
, "type error in vector constructor: "
662 "expected: %s, found %s",
663 constructor_type
->get_scalar_type()->name
,
665 return ir_rvalue::error_value(ctx
);
668 /* Attempt to convert the parameter to a constant valued expression.
669 * After doing so, track whether or not all the parameters to the
670 * constructor are trivially constant valued expressions.
672 ir_rvalue
*const constant
= result
->constant_expression_value();
674 if (constant
!= NULL
)
677 all_parameters_are_constant
= false;
679 ir
->replace_with(result
);
682 if (all_parameters_are_constant
)
683 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
685 ir_variable
*var
= new(ctx
) ir_variable(constructor_type
, "vec_mat_ctor",
687 instructions
->push_tail(var
);
690 foreach_list(node
, &actual_parameters
) {
691 ir_rvalue
*rhs
= (ir_rvalue
*) node
;
692 ir_rvalue
*lhs
= new(ctx
) ir_dereference_array(var
,
693 new(ctx
) ir_constant(i
));
695 ir_instruction
*assignment
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
696 instructions
->push_tail(assignment
);
701 return new(ctx
) ir_dereference_variable(var
);
706 process_array_constructor(exec_list
*instructions
,
707 const glsl_type
*constructor_type
,
708 YYLTYPE
*loc
, exec_list
*parameters
,
709 struct _mesa_glsl_parse_state
*state
)
712 /* Array constructors come in two forms: sized and unsized. Sized array
713 * constructors look like 'vec4[2](a, b)', where 'a' and 'b' are vec4
714 * variables. In this case the number of parameters must exactly match the
715 * specified size of the array.
717 * Unsized array constructors look like 'vec4[](a, b)', where 'a' and 'b'
718 * are vec4 variables. In this case the size of the array being constructed
719 * is determined by the number of parameters.
721 * From page 52 (page 58 of the PDF) of the GLSL 1.50 spec:
723 * "There must be exactly the same number of arguments as the size of
724 * the array being constructed. If no size is present in the
725 * constructor, then the array is explicitly sized to the number of
726 * arguments provided. The arguments are assigned in order, starting at
727 * element 0, to the elements of the constructed array. Each argument
728 * must be the same type as the element type of the array, or be a type
729 * that can be converted to the element type of the array according to
730 * Section 4.1.10 "Implicit Conversions.""
732 exec_list actual_parameters
;
733 const unsigned parameter_count
=
734 process_parameters(instructions
, &actual_parameters
, parameters
, state
);
735 bool is_unsized_array
= constructor_type
->is_unsized_array();
737 if ((parameter_count
== 0) ||
738 (!is_unsized_array
&& (constructor_type
->length
!= parameter_count
))) {
739 const unsigned min_param
= is_unsized_array
740 ? 1 : constructor_type
->length
;
742 _mesa_glsl_error(loc
, state
, "array constructor must have %s %u "
744 is_unsized_array
? "at least" : "exactly",
745 min_param
, (min_param
<= 1) ? "" : "s");
746 return ir_rvalue::error_value(ctx
);
749 if (is_unsized_array
) {
751 glsl_type::get_array_instance(constructor_type
->element_type(),
753 assert(constructor_type
!= NULL
);
754 assert(constructor_type
->length
== parameter_count
);
757 bool all_parameters_are_constant
= true;
759 /* Type cast each parameter and, if possible, fold constants. */
760 foreach_list_safe(n
, &actual_parameters
) {
761 ir_rvalue
*ir
= (ir_rvalue
*) n
;
762 ir_rvalue
*result
= ir
;
764 /* Apply implicit conversions (not the scalar constructor rules!). See
765 * the spec quote above. */
766 if (constructor_type
->element_type()->is_float()) {
767 const glsl_type
*desired_type
=
768 glsl_type::get_instance(GLSL_TYPE_FLOAT
,
769 ir
->type
->vector_elements
,
770 ir
->type
->matrix_columns
);
771 if (result
->type
->can_implicitly_convert_to(desired_type
)) {
772 /* Even though convert_component() implements the constructor
773 * conversion rules (not the implicit conversion rules), its safe
774 * to use it here because we already checked that the implicit
775 * conversion is legal.
777 result
= convert_component(ir
, desired_type
);
781 if (result
->type
!= constructor_type
->element_type()) {
782 _mesa_glsl_error(loc
, state
, "type error in array constructor: "
783 "expected: %s, found %s",
784 constructor_type
->element_type()->name
,
786 return ir_rvalue::error_value(ctx
);
789 /* Attempt to convert the parameter to a constant valued expression.
790 * After doing so, track whether or not all the parameters to the
791 * constructor are trivially constant valued expressions.
793 ir_rvalue
*const constant
= result
->constant_expression_value();
795 if (constant
!= NULL
)
798 all_parameters_are_constant
= false;
800 ir
->replace_with(result
);
803 if (all_parameters_are_constant
)
804 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
806 ir_variable
*var
= new(ctx
) ir_variable(constructor_type
, "array_ctor",
808 instructions
->push_tail(var
);
811 foreach_list(node
, &actual_parameters
) {
812 ir_rvalue
*rhs
= (ir_rvalue
*) node
;
813 ir_rvalue
*lhs
= new(ctx
) ir_dereference_array(var
,
814 new(ctx
) ir_constant(i
));
816 ir_instruction
*assignment
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
817 instructions
->push_tail(assignment
);
822 return new(ctx
) ir_dereference_variable(var
);
827 * Try to convert a record constructor to a constant expression
830 constant_record_constructor(const glsl_type
*constructor_type
,
831 exec_list
*parameters
, void *mem_ctx
)
833 foreach_list(node
, parameters
) {
834 ir_constant
*constant
= ((ir_instruction
*) node
)->as_constant();
835 if (constant
== NULL
)
837 node
->replace_with(constant
);
840 return new(mem_ctx
) ir_constant(constructor_type
, parameters
);
845 * Determine if a list consists of a single scalar r-value
848 single_scalar_parameter(exec_list
*parameters
)
850 const ir_rvalue
*const p
= (ir_rvalue
*) parameters
->head
;
851 assert(((ir_rvalue
*)p
)->as_rvalue() != NULL
);
853 return (p
->type
->is_scalar() && p
->next
->is_tail_sentinel());
858 * Generate inline code for a vector constructor
860 * The generated constructor code will consist of a temporary variable
861 * declaration of the same type as the constructor. A sequence of assignments
862 * from constructor parameters to the temporary will follow.
865 * An \c ir_dereference_variable of the temprorary generated in the constructor
869 emit_inline_vector_constructor(const glsl_type
*type
,
870 exec_list
*instructions
,
871 exec_list
*parameters
,
874 assert(!parameters
->is_empty());
876 ir_variable
*var
= new(ctx
) ir_variable(type
, "vec_ctor", ir_var_temporary
);
877 instructions
->push_tail(var
);
879 /* There are two kinds of vector constructors.
881 * - Construct a vector from a single scalar by replicating that scalar to
882 * all components of the vector.
884 * - Construct a vector from an arbirary combination of vectors and
885 * scalars. The components of the constructor parameters are assigned
886 * to the vector in order until the vector is full.
888 const unsigned lhs_components
= type
->components();
889 if (single_scalar_parameter(parameters
)) {
890 ir_rvalue
*first_param
= (ir_rvalue
*)parameters
->head
;
891 ir_rvalue
*rhs
= new(ctx
) ir_swizzle(first_param
, 0, 0, 0, 0,
893 ir_dereference_variable
*lhs
= new(ctx
) ir_dereference_variable(var
);
894 const unsigned mask
= (1U << lhs_components
) - 1;
896 assert(rhs
->type
== lhs
->type
);
898 ir_instruction
*inst
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
, mask
);
899 instructions
->push_tail(inst
);
901 unsigned base_component
= 0;
902 unsigned base_lhs_component
= 0;
903 ir_constant_data data
;
904 unsigned constant_mask
= 0, constant_components
= 0;
906 memset(&data
, 0, sizeof(data
));
908 foreach_list(node
, parameters
) {
909 ir_rvalue
*param
= (ir_rvalue
*) node
;
910 unsigned rhs_components
= param
->type
->components();
912 /* Do not try to assign more components to the vector than it has!
914 if ((rhs_components
+ base_lhs_component
) > lhs_components
) {
915 rhs_components
= lhs_components
- base_lhs_component
;
918 const ir_constant
*const c
= param
->as_constant();
920 for (unsigned i
= 0; i
< rhs_components
; i
++) {
921 switch (c
->type
->base_type
) {
923 data
.u
[i
+ base_component
] = c
->get_uint_component(i
);
926 data
.i
[i
+ base_component
] = c
->get_int_component(i
);
928 case GLSL_TYPE_FLOAT
:
929 data
.f
[i
+ base_component
] = c
->get_float_component(i
);
932 data
.b
[i
+ base_component
] = c
->get_bool_component(i
);
935 assert(!"Should not get here.");
940 /* Mask of fields to be written in the assignment.
942 constant_mask
|= ((1U << rhs_components
) - 1) << base_lhs_component
;
943 constant_components
+= rhs_components
;
945 base_component
+= rhs_components
;
947 /* Advance the component index by the number of components
948 * that were just assigned.
950 base_lhs_component
+= rhs_components
;
953 if (constant_mask
!= 0) {
954 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
955 const glsl_type
*rhs_type
= glsl_type::get_instance(var
->type
->base_type
,
958 ir_rvalue
*rhs
= new(ctx
) ir_constant(rhs_type
, &data
);
960 ir_instruction
*inst
=
961 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, constant_mask
);
962 instructions
->push_tail(inst
);
966 foreach_list(node
, parameters
) {
967 ir_rvalue
*param
= (ir_rvalue
*) node
;
968 unsigned rhs_components
= param
->type
->components();
970 /* Do not try to assign more components to the vector than it has!
972 if ((rhs_components
+ base_component
) > lhs_components
) {
973 rhs_components
= lhs_components
- base_component
;
976 const ir_constant
*const c
= param
->as_constant();
978 /* Mask of fields to be written in the assignment.
980 const unsigned write_mask
= ((1U << rhs_components
) - 1)
983 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
985 /* Generate a swizzle so that LHS and RHS sizes match.
988 new(ctx
) ir_swizzle(param
, 0, 1, 2, 3, rhs_components
);
990 ir_instruction
*inst
=
991 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, write_mask
);
992 instructions
->push_tail(inst
);
995 /* Advance the component index by the number of components that were
998 base_component
+= rhs_components
;
1001 return new(ctx
) ir_dereference_variable(var
);
1006 * Generate assignment of a portion of a vector to a portion of a matrix column
1008 * \param src_base First component of the source to be used in assignment
1009 * \param column Column of destination to be assiged
1010 * \param row_base First component of the destination column to be assigned
1011 * \param count Number of components to be assigned
1014 * \c src_base + \c count must be less than or equal to the number of components
1015 * in the source vector.
1018 assign_to_matrix_column(ir_variable
*var
, unsigned column
, unsigned row_base
,
1019 ir_rvalue
*src
, unsigned src_base
, unsigned count
,
1022 ir_constant
*col_idx
= new(mem_ctx
) ir_constant(column
);
1023 ir_dereference
*column_ref
= new(mem_ctx
) ir_dereference_array(var
, col_idx
);
1025 assert(column_ref
->type
->components() >= (row_base
+ count
));
1026 assert(src
->type
->components() >= (src_base
+ count
));
1028 /* Generate a swizzle that extracts the number of components from the source
1029 * that are to be assigned to the column of the matrix.
1031 if (count
< src
->type
->vector_elements
) {
1032 src
= new(mem_ctx
) ir_swizzle(src
,
1033 src_base
+ 0, src_base
+ 1,
1034 src_base
+ 2, src_base
+ 3,
1038 /* Mask of fields to be written in the assignment.
1040 const unsigned write_mask
= ((1U << count
) - 1) << row_base
;
1042 return new(mem_ctx
) ir_assignment(column_ref
, src
, NULL
, write_mask
);
1047 * Generate inline code for a matrix constructor
1049 * The generated constructor code will consist of a temporary variable
1050 * declaration of the same type as the constructor. A sequence of assignments
1051 * from constructor parameters to the temporary will follow.
1054 * An \c ir_dereference_variable of the temprorary generated in the constructor
1058 emit_inline_matrix_constructor(const glsl_type
*type
,
1059 exec_list
*instructions
,
1060 exec_list
*parameters
,
1063 assert(!parameters
->is_empty());
1065 ir_variable
*var
= new(ctx
) ir_variable(type
, "mat_ctor", ir_var_temporary
);
1066 instructions
->push_tail(var
);
1068 /* There are three kinds of matrix constructors.
1070 * - Construct a matrix from a single scalar by replicating that scalar to
1071 * along the diagonal of the matrix and setting all other components to
1074 * - Construct a matrix from an arbirary combination of vectors and
1075 * scalars. The components of the constructor parameters are assigned
1076 * to the matrix in colum-major order until the matrix is full.
1078 * - Construct a matrix from a single matrix. The source matrix is copied
1079 * to the upper left portion of the constructed matrix, and the remaining
1080 * elements take values from the identity matrix.
1082 ir_rvalue
*const first_param
= (ir_rvalue
*) parameters
->head
;
1083 if (single_scalar_parameter(parameters
)) {
1084 /* Assign the scalar to the X component of a vec4, and fill the remaining
1085 * components with zero.
1087 ir_variable
*rhs_var
=
1088 new(ctx
) ir_variable(glsl_type::vec4_type
, "mat_ctor_vec",
1090 instructions
->push_tail(rhs_var
);
1092 ir_constant_data zero
;
1098 ir_instruction
*inst
=
1099 new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(rhs_var
),
1100 new(ctx
) ir_constant(rhs_var
->type
, &zero
),
1102 instructions
->push_tail(inst
);
1104 ir_dereference
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1106 inst
= new(ctx
) ir_assignment(rhs_ref
, first_param
, NULL
, 0x01);
1107 instructions
->push_tail(inst
);
1109 /* Assign the temporary vector to each column of the destination matrix
1110 * with a swizzle that puts the X component on the diagonal of the
1111 * matrix. In some cases this may mean that the X component does not
1112 * get assigned into the column at all (i.e., when the matrix has more
1113 * columns than rows).
1115 static const unsigned rhs_swiz
[4][4] = {
1122 const unsigned cols_to_init
= MIN2(type
->matrix_columns
,
1123 type
->vector_elements
);
1124 for (unsigned i
= 0; i
< cols_to_init
; i
++) {
1125 ir_constant
*const col_idx
= new(ctx
) ir_constant(i
);
1126 ir_rvalue
*const col_ref
= new(ctx
) ir_dereference_array(var
, col_idx
);
1128 ir_rvalue
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1129 ir_rvalue
*const rhs
= new(ctx
) ir_swizzle(rhs_ref
, rhs_swiz
[i
],
1130 type
->vector_elements
);
1132 inst
= new(ctx
) ir_assignment(col_ref
, rhs
, NULL
);
1133 instructions
->push_tail(inst
);
1136 for (unsigned i
= cols_to_init
; i
< type
->matrix_columns
; i
++) {
1137 ir_constant
*const col_idx
= new(ctx
) ir_constant(i
);
1138 ir_rvalue
*const col_ref
= new(ctx
) ir_dereference_array(var
, col_idx
);
1140 ir_rvalue
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1141 ir_rvalue
*const rhs
= new(ctx
) ir_swizzle(rhs_ref
, 1, 1, 1, 1,
1142 type
->vector_elements
);
1144 inst
= new(ctx
) ir_assignment(col_ref
, rhs
, NULL
);
1145 instructions
->push_tail(inst
);
1147 } else if (first_param
->type
->is_matrix()) {
1148 /* From page 50 (56 of the PDF) of the GLSL 1.50 spec:
1150 * "If a matrix is constructed from a matrix, then each component
1151 * (column i, row j) in the result that has a corresponding
1152 * component (column i, row j) in the argument will be initialized
1153 * from there. All other components will be initialized to the
1154 * identity matrix. If a matrix argument is given to a matrix
1155 * constructor, it is an error to have any other arguments."
1157 assert(first_param
->next
->is_tail_sentinel());
1158 ir_rvalue
*const src_matrix
= first_param
;
1160 /* If the source matrix is smaller, pre-initialize the relavent parts of
1161 * the destination matrix to the identity matrix.
1163 if ((src_matrix
->type
->matrix_columns
< var
->type
->matrix_columns
)
1164 || (src_matrix
->type
->vector_elements
< var
->type
->vector_elements
)) {
1166 /* If the source matrix has fewer rows, every column of the destination
1167 * must be initialized. Otherwise only the columns in the destination
1168 * that do not exist in the source must be initialized.
1171 (src_matrix
->type
->vector_elements
< var
->type
->vector_elements
)
1172 ? 0 : src_matrix
->type
->matrix_columns
;
1174 const glsl_type
*const col_type
= var
->type
->column_type();
1175 for (/* empty */; col
< var
->type
->matrix_columns
; col
++) {
1176 ir_constant_data ident
;
1185 ir_rvalue
*const rhs
= new(ctx
) ir_constant(col_type
, &ident
);
1187 ir_rvalue
*const lhs
=
1188 new(ctx
) ir_dereference_array(var
, new(ctx
) ir_constant(col
));
1190 ir_instruction
*inst
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
1191 instructions
->push_tail(inst
);
1195 /* Assign columns from the source matrix to the destination matrix.
1197 * Since the parameter will be used in the RHS of multiple assignments,
1198 * generate a temporary and copy the paramter there.
1200 ir_variable
*const rhs_var
=
1201 new(ctx
) ir_variable(first_param
->type
, "mat_ctor_mat",
1203 instructions
->push_tail(rhs_var
);
1205 ir_dereference
*const rhs_var_ref
=
1206 new(ctx
) ir_dereference_variable(rhs_var
);
1207 ir_instruction
*const inst
=
1208 new(ctx
) ir_assignment(rhs_var_ref
, first_param
, NULL
);
1209 instructions
->push_tail(inst
);
1211 const unsigned last_row
= MIN2(src_matrix
->type
->vector_elements
,
1212 var
->type
->vector_elements
);
1213 const unsigned last_col
= MIN2(src_matrix
->type
->matrix_columns
,
1214 var
->type
->matrix_columns
);
1216 unsigned swiz
[4] = { 0, 0, 0, 0 };
1217 for (unsigned i
= 1; i
< last_row
; i
++)
1220 const unsigned write_mask
= (1U << last_row
) - 1;
1222 for (unsigned i
= 0; i
< last_col
; i
++) {
1223 ir_dereference
*const lhs
=
1224 new(ctx
) ir_dereference_array(var
, new(ctx
) ir_constant(i
));
1225 ir_rvalue
*const rhs_col
=
1226 new(ctx
) ir_dereference_array(rhs_var
, new(ctx
) ir_constant(i
));
1228 /* If one matrix has columns that are smaller than the columns of the
1229 * other matrix, wrap the column access of the larger with a swizzle
1230 * so that the LHS and RHS of the assignment have the same size (and
1231 * therefore have the same type).
1233 * It would be perfectly valid to unconditionally generate the
1234 * swizzles, this this will typically result in a more compact IR tree.
1237 if (lhs
->type
->vector_elements
!= rhs_col
->type
->vector_elements
) {
1238 rhs
= new(ctx
) ir_swizzle(rhs_col
, swiz
, last_row
);
1243 ir_instruction
*inst
=
1244 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, write_mask
);
1245 instructions
->push_tail(inst
);
1248 const unsigned cols
= type
->matrix_columns
;
1249 const unsigned rows
= type
->vector_elements
;
1250 unsigned col_idx
= 0;
1251 unsigned row_idx
= 0;
1253 foreach_list (node
, parameters
) {
1254 ir_rvalue
*const rhs
= (ir_rvalue
*) node
;
1255 const unsigned components_remaining_this_column
= rows
- row_idx
;
1256 unsigned rhs_components
= rhs
->type
->components();
1257 unsigned rhs_base
= 0;
1259 /* Since the parameter might be used in the RHS of two assignments,
1260 * generate a temporary and copy the paramter there.
1262 ir_variable
*rhs_var
=
1263 new(ctx
) ir_variable(rhs
->type
, "mat_ctor_vec", ir_var_temporary
);
1264 instructions
->push_tail(rhs_var
);
1266 ir_dereference
*rhs_var_ref
=
1267 new(ctx
) ir_dereference_variable(rhs_var
);
1268 ir_instruction
*inst
= new(ctx
) ir_assignment(rhs_var_ref
, rhs
, NULL
);
1269 instructions
->push_tail(inst
);
1271 /* Assign the current parameter to as many components of the matrix
1274 * NOTE: A single vector parameter can span two matrix columns. A
1275 * single vec4, for example, can completely fill a mat2.
1277 if (rhs_components
>= components_remaining_this_column
) {
1278 const unsigned count
= MIN2(rhs_components
,
1279 components_remaining_this_column
);
1281 rhs_var_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1283 ir_instruction
*inst
= assign_to_matrix_column(var
, col_idx
,
1287 instructions
->push_tail(inst
);
1295 /* If there is data left in the parameter and components left to be
1296 * set in the destination, emit another assignment. It is possible
1297 * that the assignment could be of a vec4 to the last element of the
1298 * matrix. In this case col_idx==cols, but there is still data
1299 * left in the source parameter. Obviously, don't emit an assignment
1300 * to data outside the destination matrix.
1302 if ((col_idx
< cols
) && (rhs_base
< rhs_components
)) {
1303 const unsigned count
= rhs_components
- rhs_base
;
1305 rhs_var_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1307 ir_instruction
*inst
= assign_to_matrix_column(var
, col_idx
,
1312 instructions
->push_tail(inst
);
1319 return new(ctx
) ir_dereference_variable(var
);
1324 emit_inline_record_constructor(const glsl_type
*type
,
1325 exec_list
*instructions
,
1326 exec_list
*parameters
,
1329 ir_variable
*const var
=
1330 new(mem_ctx
) ir_variable(type
, "record_ctor", ir_var_temporary
);
1331 ir_dereference_variable
*const d
= new(mem_ctx
) ir_dereference_variable(var
);
1333 instructions
->push_tail(var
);
1335 exec_node
*node
= parameters
->head
;
1336 for (unsigned i
= 0; i
< type
->length
; i
++) {
1337 assert(!node
->is_tail_sentinel());
1339 ir_dereference
*const lhs
=
1340 new(mem_ctx
) ir_dereference_record(d
->clone(mem_ctx
, NULL
),
1341 type
->fields
.structure
[i
].name
);
1343 ir_rvalue
*const rhs
= ((ir_instruction
*) node
)->as_rvalue();
1344 assert(rhs
!= NULL
);
1346 ir_instruction
*const assign
= new(mem_ctx
) ir_assignment(lhs
, rhs
, NULL
);
1348 instructions
->push_tail(assign
);
1357 process_record_constructor(exec_list
*instructions
,
1358 const glsl_type
*constructor_type
,
1359 YYLTYPE
*loc
, exec_list
*parameters
,
1360 struct _mesa_glsl_parse_state
*state
)
1363 exec_list actual_parameters
;
1365 process_parameters(instructions
, &actual_parameters
,
1368 exec_node
*node
= actual_parameters
.head
;
1369 for (unsigned i
= 0; i
< constructor_type
->length
; i
++) {
1370 ir_rvalue
*ir
= (ir_rvalue
*) node
;
1372 if (node
->is_tail_sentinel()) {
1373 _mesa_glsl_error(loc
, state
,
1374 "insufficient parameters to constructor for `%s'",
1375 constructor_type
->name
);
1376 return ir_rvalue::error_value(ctx
);
1379 if (apply_implicit_conversion(constructor_type
->fields
.structure
[i
].type
,
1381 node
->replace_with(ir
);
1383 _mesa_glsl_error(loc
, state
,
1384 "parameter type mismatch in constructor for `%s.%s' "
1386 constructor_type
->name
,
1387 constructor_type
->fields
.structure
[i
].name
,
1389 constructor_type
->fields
.structure
[i
].type
->name
);
1390 return ir_rvalue::error_value(ctx
);;
1396 if (!node
->is_tail_sentinel()) {
1397 _mesa_glsl_error(loc
, state
, "too many parameters in constructor "
1398 "for `%s'", constructor_type
->name
);
1399 return ir_rvalue::error_value(ctx
);
1402 ir_rvalue
*const constant
=
1403 constant_record_constructor(constructor_type
, &actual_parameters
,
1406 return (constant
!= NULL
)
1408 : emit_inline_record_constructor(constructor_type
, instructions
,
1409 &actual_parameters
, state
);
1414 ast_function_expression::hir(exec_list
*instructions
,
1415 struct _mesa_glsl_parse_state
*state
)
1418 /* There are three sorts of function calls.
1420 * 1. constructors - The first subexpression is an ast_type_specifier.
1421 * 2. methods - Only the .length() method of array types.
1422 * 3. functions - Calls to regular old functions.
1424 * Method calls are actually detected when the ast_field_selection
1425 * expression is handled.
1427 if (is_constructor()) {
1428 const ast_type_specifier
*type
= (ast_type_specifier
*) subexpressions
[0];
1429 YYLTYPE loc
= type
->get_location();
1432 const glsl_type
*const constructor_type
= type
->glsl_type(& name
, state
);
1434 /* constructor_type can be NULL if a variable with the same name as the
1435 * structure has come into scope.
1437 if (constructor_type
== NULL
) {
1438 _mesa_glsl_error(& loc
, state
, "unknown type `%s' (structure name "
1439 "may be shadowed by a variable with the same name)",
1441 return ir_rvalue::error_value(ctx
);
1445 /* Constructors for samplers are illegal.
1447 if (constructor_type
->is_sampler()) {
1448 _mesa_glsl_error(& loc
, state
, "cannot construct sampler type `%s'",
1449 constructor_type
->name
);
1450 return ir_rvalue::error_value(ctx
);
1453 if (constructor_type
->is_array()) {
1454 if (!state
->check_version(120, 300, &loc
,
1455 "array constructors forbidden")) {
1456 return ir_rvalue::error_value(ctx
);
1459 return process_array_constructor(instructions
, constructor_type
,
1460 & loc
, &this->expressions
, state
);
1464 /* There are two kinds of constructor calls. Constructors for arrays and
1465 * structures must have the exact number of arguments with matching types
1466 * in the correct order. These constructors follow essentially the same
1467 * type matching rules as functions.
1469 * Constructors for built-in language types, such as mat4 and vec2, are
1470 * free form. The only requirements are that the parameters must provide
1471 * enough values of the correct scalar type and that no arguments are
1472 * given past the last used argument.
1474 * When using the C-style initializer syntax from GLSL 4.20, constructors
1475 * must have the exact number of arguments with matching types in the
1478 if (constructor_type
->is_record()) {
1479 return process_record_constructor(instructions
, constructor_type
,
1480 &loc
, &this->expressions
,
1484 if (!constructor_type
->is_numeric() && !constructor_type
->is_boolean())
1485 return ir_rvalue::error_value(ctx
);
1487 /* Total number of components of the type being constructed. */
1488 const unsigned type_components
= constructor_type
->components();
1490 /* Number of components from parameters that have actually been
1491 * consumed. This is used to perform several kinds of error checking.
1493 unsigned components_used
= 0;
1495 unsigned matrix_parameters
= 0;
1496 unsigned nonmatrix_parameters
= 0;
1497 exec_list actual_parameters
;
1499 foreach_list (n
, &this->expressions
) {
1500 ast_node
*ast
= exec_node_data(ast_node
, n
, link
);
1501 ir_rvalue
*result
= ast
->hir(instructions
, state
)->as_rvalue();
1503 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
1505 * "It is an error to provide extra arguments beyond this
1506 * last used argument."
1508 if (components_used
>= type_components
) {
1509 _mesa_glsl_error(& loc
, state
, "too many parameters to `%s' "
1511 constructor_type
->name
);
1512 return ir_rvalue::error_value(ctx
);
1515 if (!result
->type
->is_numeric() && !result
->type
->is_boolean()) {
1516 _mesa_glsl_error(& loc
, state
, "cannot construct `%s' from a "
1517 "non-numeric data type",
1518 constructor_type
->name
);
1519 return ir_rvalue::error_value(ctx
);
1522 /* Count the number of matrix and nonmatrix parameters. This
1523 * is used below to enforce some of the constructor rules.
1525 if (result
->type
->is_matrix())
1526 matrix_parameters
++;
1528 nonmatrix_parameters
++;
1530 actual_parameters
.push_tail(result
);
1531 components_used
+= result
->type
->components();
1534 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
1536 * "It is an error to construct matrices from other matrices. This
1537 * is reserved for future use."
1539 if (matrix_parameters
> 0
1540 && constructor_type
->is_matrix()
1541 && !state
->check_version(120, 100, &loc
,
1542 "cannot construct `%s' from a matrix",
1543 constructor_type
->name
)) {
1544 return ir_rvalue::error_value(ctx
);
1547 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
1549 * "If a matrix argument is given to a matrix constructor, it is
1550 * an error to have any other arguments."
1552 if ((matrix_parameters
> 0)
1553 && ((matrix_parameters
+ nonmatrix_parameters
) > 1)
1554 && constructor_type
->is_matrix()) {
1555 _mesa_glsl_error(& loc
, state
, "for matrix `%s' constructor, "
1556 "matrix must be only parameter",
1557 constructor_type
->name
);
1558 return ir_rvalue::error_value(ctx
);
1561 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
1563 * "In these cases, there must be enough components provided in the
1564 * arguments to provide an initializer for every component in the
1565 * constructed value."
1567 if (components_used
< type_components
&& components_used
!= 1
1568 && matrix_parameters
== 0) {
1569 _mesa_glsl_error(& loc
, state
, "too few components to construct "
1571 constructor_type
->name
);
1572 return ir_rvalue::error_value(ctx
);
1575 /* Later, we cast each parameter to the same base type as the
1576 * constructor. Since there are no non-floating point matrices, we
1577 * need to break them up into a series of column vectors.
1579 if (constructor_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1580 foreach_list_safe(n
, &actual_parameters
) {
1581 ir_rvalue
*matrix
= (ir_rvalue
*) n
;
1583 if (!matrix
->type
->is_matrix())
1586 /* Create a temporary containing the matrix. */
1587 ir_variable
*var
= new(ctx
) ir_variable(matrix
->type
, "matrix_tmp",
1589 instructions
->push_tail(var
);
1590 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
)
1591 ir_dereference_variable(var
), matrix
, NULL
));
1592 var
->constant_value
= matrix
->constant_expression_value();
1594 /* Replace the matrix with dereferences of its columns. */
1595 for (int i
= 0; i
< matrix
->type
->matrix_columns
; i
++) {
1596 matrix
->insert_before(new (ctx
) ir_dereference_array(var
,
1597 new(ctx
) ir_constant(i
)));
1603 bool all_parameters_are_constant
= true;
1605 /* Type cast each parameter and, if possible, fold constants.*/
1606 foreach_list_safe(n
, &actual_parameters
) {
1607 ir_rvalue
*ir
= (ir_rvalue
*) n
;
1609 const glsl_type
*desired_type
=
1610 glsl_type::get_instance(constructor_type
->base_type
,
1611 ir
->type
->vector_elements
,
1612 ir
->type
->matrix_columns
);
1613 ir_rvalue
*result
= convert_component(ir
, desired_type
);
1615 /* Attempt to convert the parameter to a constant valued expression.
1616 * After doing so, track whether or not all the parameters to the
1617 * constructor are trivially constant valued expressions.
1619 ir_rvalue
*const constant
= result
->constant_expression_value();
1621 if (constant
!= NULL
)
1624 all_parameters_are_constant
= false;
1627 ir
->replace_with(result
);
1631 /* If all of the parameters are trivially constant, create a
1632 * constant representing the complete collection of parameters.
1634 if (all_parameters_are_constant
) {
1635 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
1636 } else if (constructor_type
->is_scalar()) {
1637 return dereference_component((ir_rvalue
*) actual_parameters
.head
,
1639 } else if (constructor_type
->is_vector()) {
1640 return emit_inline_vector_constructor(constructor_type
,
1645 assert(constructor_type
->is_matrix());
1646 return emit_inline_matrix_constructor(constructor_type
,
1652 const ast_expression
*id
= subexpressions
[0];
1653 const char *func_name
= id
->primary_expression
.identifier
;
1654 YYLTYPE loc
= id
->get_location();
1655 exec_list actual_parameters
;
1657 process_parameters(instructions
, &actual_parameters
, &this->expressions
,
1660 ir_function_signature
*sig
=
1661 match_function_by_name(func_name
, &actual_parameters
, state
);
1663 ir_rvalue
*value
= NULL
;
1665 no_matching_function_error(func_name
, &loc
, &actual_parameters
, state
);
1666 value
= ir_rvalue::error_value(ctx
);
1667 } else if (!verify_parameter_modes(state
, sig
, actual_parameters
, this->expressions
)) {
1668 /* an error has already been emitted */
1669 value
= ir_rvalue::error_value(ctx
);
1671 value
= generate_call(instructions
, sig
, &actual_parameters
, state
);
1677 return ir_rvalue::error_value(ctx
);
1681 ast_aggregate_initializer::hir(exec_list
*instructions
,
1682 struct _mesa_glsl_parse_state
*state
)
1685 YYLTYPE loc
= this->get_location();
1688 if (!this->constructor_type
) {
1689 _mesa_glsl_error(&loc
, state
, "type of C-style initializer unknown");
1690 return ir_rvalue::error_value(ctx
);
1692 const glsl_type
*const constructor_type
=
1693 this->constructor_type
->glsl_type(&name
, state
);
1695 if (!state
->ARB_shading_language_420pack_enable
) {
1696 _mesa_glsl_error(&loc
, state
, "C-style initialization requires the "
1697 "GL_ARB_shading_language_420pack extension");
1698 return ir_rvalue::error_value(ctx
);
1701 if (this->constructor_type
->is_array
) {
1702 return process_array_constructor(instructions
, constructor_type
, &loc
,
1703 &this->expressions
, state
);
1706 if (this->constructor_type
->structure
) {
1707 return process_record_constructor(instructions
, constructor_type
, &loc
,
1708 &this->expressions
, state
);
1711 return process_vec_mat_constructor(instructions
, constructor_type
, &loc
,
1712 &this->expressions
, state
);