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 * If a function call is generated, \c call_ir will point to it on exit.
278 * Otherwise \c call_ir will be set to \c NULL.
281 generate_call(exec_list
*instructions
, ir_function_signature
*sig
,
282 exec_list
*actual_parameters
,
284 struct _mesa_glsl_parse_state
*state
)
287 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_functions(state
);
407 for (unsigned i
= 0; i
< state
->num_builtins_to_link
; i
++) {
408 ir_function
*builtin
=
409 state
->builtins_to_link
[i
]->symbols
->get_function(name
);
413 bool is_exact
= false;
414 ir_function_signature
*builtin_sig
=
415 builtin
->matching_signature(state
, actual_parameters
, &is_exact
);
417 if (builtin_sig
== NULL
)
420 /* If the built-in signature is exact, we can stop. */
427 /* We found an inexact match, which is better than nothing. However,
428 * we should keep searching for an exact match.
436 /* If the match is from a linked built-in shader, import the prototype. */
437 if (sig
!= local_sig
) {
439 f
= new(ctx
) ir_function(name
);
440 state
->symbols
->add_global_function(f
);
441 emit_function(state
, f
);
443 f
->add_signature(sig
->clone_prototype(f
, NULL
));
450 * Raise a "no matching function" error, listing all possible overloads the
451 * compiler considered so developers can figure out what went wrong.
454 no_matching_function_error(const char *name
,
456 exec_list
*actual_parameters
,
457 _mesa_glsl_parse_state
*state
)
459 char *str
= prototype_string(NULL
, name
, actual_parameters
);
460 _mesa_glsl_error(loc
, state
, "no matching function for call to `%s'", str
);
463 const char *prefix
= "candidates are: ";
465 for (int i
= -1; i
< (int) state
->num_builtins_to_link
; i
++) {
466 glsl_symbol_table
*syms
= i
>= 0 ? state
->builtins_to_link
[i
]->symbols
468 ir_function
*f
= syms
->get_function(name
);
472 foreach_list (node
, &f
->signatures
) {
473 ir_function_signature
*sig
= (ir_function_signature
*) node
;
475 str
= prototype_string(sig
->return_type
, f
->name
, &sig
->parameters
);
476 _mesa_glsl_error(loc
, state
, "%s%s", prefix
, str
);
485 * Perform automatic type conversion of constructor parameters
487 * This implements the rules in the "Conversion and Scalar Constructors"
488 * section (GLSL 1.10 section 5.4.1), not the "Implicit Conversions" rules.
491 convert_component(ir_rvalue
*src
, const glsl_type
*desired_type
)
493 void *ctx
= ralloc_parent(src
);
494 const unsigned a
= desired_type
->base_type
;
495 const unsigned b
= src
->type
->base_type
;
496 ir_expression
*result
= NULL
;
498 if (src
->type
->is_error())
501 assert(a
<= GLSL_TYPE_BOOL
);
502 assert(b
<= GLSL_TYPE_BOOL
);
511 result
= new(ctx
) ir_expression(ir_unop_i2u
, src
);
513 case GLSL_TYPE_FLOAT
:
514 result
= new(ctx
) ir_expression(ir_unop_f2u
, src
);
517 result
= new(ctx
) ir_expression(ir_unop_i2u
,
518 new(ctx
) ir_expression(ir_unop_b2i
, src
));
525 result
= new(ctx
) ir_expression(ir_unop_u2i
, src
);
527 case GLSL_TYPE_FLOAT
:
528 result
= new(ctx
) ir_expression(ir_unop_f2i
, src
);
531 result
= new(ctx
) ir_expression(ir_unop_b2i
, src
);
535 case GLSL_TYPE_FLOAT
:
538 result
= new(ctx
) ir_expression(ir_unop_u2f
, desired_type
, src
, NULL
);
541 result
= new(ctx
) ir_expression(ir_unop_i2f
, desired_type
, src
, NULL
);
544 result
= new(ctx
) ir_expression(ir_unop_b2f
, desired_type
, src
, NULL
);
551 result
= new(ctx
) ir_expression(ir_unop_i2b
,
552 new(ctx
) ir_expression(ir_unop_u2i
, src
));
555 result
= new(ctx
) ir_expression(ir_unop_i2b
, desired_type
, src
, NULL
);
557 case GLSL_TYPE_FLOAT
:
558 result
= new(ctx
) ir_expression(ir_unop_f2b
, desired_type
, src
, NULL
);
564 assert(result
!= NULL
);
565 assert(result
->type
== desired_type
);
567 /* Try constant folding; it may fold in the conversion we just added. */
568 ir_constant
*const constant
= result
->constant_expression_value();
569 return (constant
!= NULL
) ? (ir_rvalue
*) constant
: (ir_rvalue
*) result
;
573 * Dereference a specific component from a scalar, vector, or matrix
576 dereference_component(ir_rvalue
*src
, unsigned component
)
578 void *ctx
= ralloc_parent(src
);
579 assert(component
< src
->type
->components());
581 /* If the source is a constant, just create a new constant instead of a
582 * dereference of the existing constant.
584 ir_constant
*constant
= src
->as_constant();
586 return new(ctx
) ir_constant(constant
, component
);
588 if (src
->type
->is_scalar()) {
590 } else if (src
->type
->is_vector()) {
591 return new(ctx
) ir_swizzle(src
, component
, 0, 0, 0, 1);
593 assert(src
->type
->is_matrix());
595 /* Dereference a row of the matrix, then call this function again to get
596 * a specific element from that row.
598 const int c
= component
/ src
->type
->column_type()->vector_elements
;
599 const int r
= component
% src
->type
->column_type()->vector_elements
;
600 ir_constant
*const col_index
= new(ctx
) ir_constant(c
);
601 ir_dereference
*const col
= new(ctx
) ir_dereference_array(src
, col_index
);
603 col
->type
= src
->type
->column_type();
605 return dereference_component(col
, r
);
608 assert(!"Should not get here.");
614 process_vec_mat_constructor(exec_list
*instructions
,
615 const glsl_type
*constructor_type
,
616 YYLTYPE
*loc
, exec_list
*parameters
,
617 struct _mesa_glsl_parse_state
*state
)
621 /* The ARB_shading_language_420pack spec says:
623 * "If an initializer is a list of initializers enclosed in curly braces,
624 * the variable being declared must be a vector, a matrix, an array, or a
627 * int i = { 1 }; // illegal, i is not an aggregate"
629 if (constructor_type
->vector_elements
<= 1) {
630 _mesa_glsl_error(loc
, state
, "aggregates can only initialize vectors, "
631 "matrices, arrays, and structs");
632 return ir_rvalue::error_value(ctx
);
635 exec_list actual_parameters
;
636 const unsigned parameter_count
=
637 process_parameters(instructions
, &actual_parameters
, parameters
, state
);
639 if (parameter_count
== 0
640 || (constructor_type
->is_vector() &&
641 constructor_type
->vector_elements
!= parameter_count
)
642 || (constructor_type
->is_matrix() &&
643 constructor_type
->matrix_columns
!= parameter_count
)) {
644 _mesa_glsl_error(loc
, state
, "%s constructor must have %u parameters",
645 constructor_type
->is_vector() ? "vector" : "matrix",
646 constructor_type
->vector_elements
);
647 return ir_rvalue::error_value(ctx
);
650 bool all_parameters_are_constant
= true;
652 /* Type cast each parameter and, if possible, fold constants. */
653 foreach_list_safe(n
, &actual_parameters
) {
654 ir_rvalue
*ir
= (ir_rvalue
*) n
;
655 ir_rvalue
*result
= ir
;
657 /* Apply implicit conversions (not the scalar constructor rules!). See
658 * the spec quote above. */
659 if (constructor_type
->is_float()) {
660 const glsl_type
*desired_type
=
661 glsl_type::get_instance(GLSL_TYPE_FLOAT
,
662 ir
->type
->vector_elements
,
663 ir
->type
->matrix_columns
);
664 if (result
->type
->can_implicitly_convert_to(desired_type
)) {
665 /* Even though convert_component() implements the constructor
666 * conversion rules (not the implicit conversion rules), its safe
667 * to use it here because we already checked that the implicit
668 * conversion is legal.
670 result
= convert_component(ir
, desired_type
);
674 if (constructor_type
->is_matrix()) {
675 if (result
->type
!= constructor_type
->column_type()) {
676 _mesa_glsl_error(loc
, state
, "type error in matrix constructor: "
677 "expected: %s, found %s",
678 constructor_type
->column_type()->name
,
680 return ir_rvalue::error_value(ctx
);
682 } else if (result
->type
!= constructor_type
->get_scalar_type()) {
683 _mesa_glsl_error(loc
, state
, "type error in vector constructor: "
684 "expected: %s, found %s",
685 constructor_type
->get_scalar_type()->name
,
687 return ir_rvalue::error_value(ctx
);
690 /* Attempt to convert the parameter to a constant valued expression.
691 * After doing so, track whether or not all the parameters to the
692 * constructor are trivially constant valued expressions.
694 ir_rvalue
*const constant
= result
->constant_expression_value();
696 if (constant
!= NULL
)
699 all_parameters_are_constant
= false;
701 ir
->replace_with(result
);
704 if (all_parameters_are_constant
)
705 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
707 ir_variable
*var
= new(ctx
) ir_variable(constructor_type
, "vec_mat_ctor",
709 instructions
->push_tail(var
);
712 foreach_list(node
, &actual_parameters
) {
713 ir_rvalue
*rhs
= (ir_rvalue
*) node
;
714 ir_rvalue
*lhs
= new(ctx
) ir_dereference_array(var
,
715 new(ctx
) ir_constant(i
));
717 ir_instruction
*assignment
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
718 instructions
->push_tail(assignment
);
723 return new(ctx
) ir_dereference_variable(var
);
728 process_array_constructor(exec_list
*instructions
,
729 const glsl_type
*constructor_type
,
730 YYLTYPE
*loc
, exec_list
*parameters
,
731 struct _mesa_glsl_parse_state
*state
)
734 /* Array constructors come in two forms: sized and unsized. Sized array
735 * constructors look like 'vec4[2](a, b)', where 'a' and 'b' are vec4
736 * variables. In this case the number of parameters must exactly match the
737 * specified size of the array.
739 * Unsized array constructors look like 'vec4[](a, b)', where 'a' and 'b'
740 * are vec4 variables. In this case the size of the array being constructed
741 * is determined by the number of parameters.
743 * From page 52 (page 58 of the PDF) of the GLSL 1.50 spec:
745 * "There must be exactly the same number of arguments as the size of
746 * the array being constructed. If no size is present in the
747 * constructor, then the array is explicitly sized to the number of
748 * arguments provided. The arguments are assigned in order, starting at
749 * element 0, to the elements of the constructed array. Each argument
750 * must be the same type as the element type of the array, or be a type
751 * that can be converted to the element type of the array according to
752 * Section 4.1.10 "Implicit Conversions.""
754 exec_list actual_parameters
;
755 const unsigned parameter_count
=
756 process_parameters(instructions
, &actual_parameters
, parameters
, state
);
758 if ((parameter_count
== 0)
759 || ((constructor_type
->length
!= 0)
760 && (constructor_type
->length
!= parameter_count
))) {
761 const unsigned min_param
= (constructor_type
->length
== 0)
762 ? 1 : constructor_type
->length
;
764 _mesa_glsl_error(loc
, state
, "array constructor must have %s %u "
766 (constructor_type
->length
== 0) ? "at least" : "exactly",
767 min_param
, (min_param
<= 1) ? "" : "s");
768 return ir_rvalue::error_value(ctx
);
771 if (constructor_type
->length
== 0) {
773 glsl_type::get_array_instance(constructor_type
->element_type(),
775 assert(constructor_type
!= NULL
);
776 assert(constructor_type
->length
== parameter_count
);
779 bool all_parameters_are_constant
= true;
781 /* Type cast each parameter and, if possible, fold constants. */
782 foreach_list_safe(n
, &actual_parameters
) {
783 ir_rvalue
*ir
= (ir_rvalue
*) n
;
784 ir_rvalue
*result
= ir
;
786 /* Apply implicit conversions (not the scalar constructor rules!). See
787 * the spec quote above. */
788 if (constructor_type
->element_type()->is_float()) {
789 const glsl_type
*desired_type
=
790 glsl_type::get_instance(GLSL_TYPE_FLOAT
,
791 ir
->type
->vector_elements
,
792 ir
->type
->matrix_columns
);
793 if (result
->type
->can_implicitly_convert_to(desired_type
)) {
794 /* Even though convert_component() implements the constructor
795 * conversion rules (not the implicit conversion rules), its safe
796 * to use it here because we already checked that the implicit
797 * conversion is legal.
799 result
= convert_component(ir
, desired_type
);
803 if (result
->type
!= constructor_type
->element_type()) {
804 _mesa_glsl_error(loc
, state
, "type error in array constructor: "
805 "expected: %s, found %s",
806 constructor_type
->element_type()->name
,
808 return ir_rvalue::error_value(ctx
);
811 /* Attempt to convert the parameter to a constant valued expression.
812 * After doing so, track whether or not all the parameters to the
813 * constructor are trivially constant valued expressions.
815 ir_rvalue
*const constant
= result
->constant_expression_value();
817 if (constant
!= NULL
)
820 all_parameters_are_constant
= false;
822 ir
->replace_with(result
);
825 if (all_parameters_are_constant
)
826 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
828 ir_variable
*var
= new(ctx
) ir_variable(constructor_type
, "array_ctor",
830 instructions
->push_tail(var
);
833 foreach_list(node
, &actual_parameters
) {
834 ir_rvalue
*rhs
= (ir_rvalue
*) node
;
835 ir_rvalue
*lhs
= new(ctx
) ir_dereference_array(var
,
836 new(ctx
) ir_constant(i
));
838 ir_instruction
*assignment
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
839 instructions
->push_tail(assignment
);
844 return new(ctx
) ir_dereference_variable(var
);
849 * Try to convert a record constructor to a constant expression
852 constant_record_constructor(const glsl_type
*constructor_type
,
853 exec_list
*parameters
, void *mem_ctx
)
855 foreach_list(node
, parameters
) {
856 ir_constant
*constant
= ((ir_instruction
*) node
)->as_constant();
857 if (constant
== NULL
)
859 node
->replace_with(constant
);
862 return new(mem_ctx
) ir_constant(constructor_type
, parameters
);
867 * Determine if a list consists of a single scalar r-value
870 single_scalar_parameter(exec_list
*parameters
)
872 const ir_rvalue
*const p
= (ir_rvalue
*) parameters
->head
;
873 assert(((ir_rvalue
*)p
)->as_rvalue() != NULL
);
875 return (p
->type
->is_scalar() && p
->next
->is_tail_sentinel());
880 * Generate inline code for a vector constructor
882 * The generated constructor code will consist of a temporary variable
883 * declaration of the same type as the constructor. A sequence of assignments
884 * from constructor parameters to the temporary will follow.
887 * An \c ir_dereference_variable of the temprorary generated in the constructor
891 emit_inline_vector_constructor(const glsl_type
*type
,
892 exec_list
*instructions
,
893 exec_list
*parameters
,
896 assert(!parameters
->is_empty());
898 ir_variable
*var
= new(ctx
) ir_variable(type
, "vec_ctor", ir_var_temporary
);
899 instructions
->push_tail(var
);
901 /* There are two kinds of vector constructors.
903 * - Construct a vector from a single scalar by replicating that scalar to
904 * all components of the vector.
906 * - Construct a vector from an arbirary combination of vectors and
907 * scalars. The components of the constructor parameters are assigned
908 * to the vector in order until the vector is full.
910 const unsigned lhs_components
= type
->components();
911 if (single_scalar_parameter(parameters
)) {
912 ir_rvalue
*first_param
= (ir_rvalue
*)parameters
->head
;
913 ir_rvalue
*rhs
= new(ctx
) ir_swizzle(first_param
, 0, 0, 0, 0,
915 ir_dereference_variable
*lhs
= new(ctx
) ir_dereference_variable(var
);
916 const unsigned mask
= (1U << lhs_components
) - 1;
918 assert(rhs
->type
== lhs
->type
);
920 ir_instruction
*inst
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
, mask
);
921 instructions
->push_tail(inst
);
923 unsigned base_component
= 0;
924 unsigned base_lhs_component
= 0;
925 ir_constant_data data
;
926 unsigned constant_mask
= 0, constant_components
= 0;
928 memset(&data
, 0, sizeof(data
));
930 foreach_list(node
, parameters
) {
931 ir_rvalue
*param
= (ir_rvalue
*) node
;
932 unsigned rhs_components
= param
->type
->components();
934 /* Do not try to assign more components to the vector than it has!
936 if ((rhs_components
+ base_lhs_component
) > lhs_components
) {
937 rhs_components
= lhs_components
- base_lhs_component
;
940 const ir_constant
*const c
= param
->as_constant();
942 for (unsigned i
= 0; i
< rhs_components
; i
++) {
943 switch (c
->type
->base_type
) {
945 data
.u
[i
+ base_component
] = c
->get_uint_component(i
);
948 data
.i
[i
+ base_component
] = c
->get_int_component(i
);
950 case GLSL_TYPE_FLOAT
:
951 data
.f
[i
+ base_component
] = c
->get_float_component(i
);
954 data
.b
[i
+ base_component
] = c
->get_bool_component(i
);
957 assert(!"Should not get here.");
962 /* Mask of fields to be written in the assignment.
964 constant_mask
|= ((1U << rhs_components
) - 1) << base_lhs_component
;
965 constant_components
+= rhs_components
;
967 base_component
+= rhs_components
;
969 /* Advance the component index by the number of components
970 * that were just assigned.
972 base_lhs_component
+= rhs_components
;
975 if (constant_mask
!= 0) {
976 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
977 const glsl_type
*rhs_type
= glsl_type::get_instance(var
->type
->base_type
,
980 ir_rvalue
*rhs
= new(ctx
) ir_constant(rhs_type
, &data
);
982 ir_instruction
*inst
=
983 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, constant_mask
);
984 instructions
->push_tail(inst
);
988 foreach_list(node
, parameters
) {
989 ir_rvalue
*param
= (ir_rvalue
*) node
;
990 unsigned rhs_components
= param
->type
->components();
992 /* Do not try to assign more components to the vector than it has!
994 if ((rhs_components
+ base_component
) > lhs_components
) {
995 rhs_components
= lhs_components
- base_component
;
998 const ir_constant
*const c
= param
->as_constant();
1000 /* Mask of fields to be written in the assignment.
1002 const unsigned write_mask
= ((1U << rhs_components
) - 1)
1005 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
1007 /* Generate a swizzle so that LHS and RHS sizes match.
1010 new(ctx
) ir_swizzle(param
, 0, 1, 2, 3, rhs_components
);
1012 ir_instruction
*inst
=
1013 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, write_mask
);
1014 instructions
->push_tail(inst
);
1017 /* Advance the component index by the number of components that were
1020 base_component
+= rhs_components
;
1023 return new(ctx
) ir_dereference_variable(var
);
1028 * Generate assignment of a portion of a vector to a portion of a matrix column
1030 * \param src_base First component of the source to be used in assignment
1031 * \param column Column of destination to be assiged
1032 * \param row_base First component of the destination column to be assigned
1033 * \param count Number of components to be assigned
1036 * \c src_base + \c count must be less than or equal to the number of components
1037 * in the source vector.
1040 assign_to_matrix_column(ir_variable
*var
, unsigned column
, unsigned row_base
,
1041 ir_rvalue
*src
, unsigned src_base
, unsigned count
,
1044 ir_constant
*col_idx
= new(mem_ctx
) ir_constant(column
);
1045 ir_dereference
*column_ref
= new(mem_ctx
) ir_dereference_array(var
, col_idx
);
1047 assert(column_ref
->type
->components() >= (row_base
+ count
));
1048 assert(src
->type
->components() >= (src_base
+ count
));
1050 /* Generate a swizzle that extracts the number of components from the source
1051 * that are to be assigned to the column of the matrix.
1053 if (count
< src
->type
->vector_elements
) {
1054 src
= new(mem_ctx
) ir_swizzle(src
,
1055 src_base
+ 0, src_base
+ 1,
1056 src_base
+ 2, src_base
+ 3,
1060 /* Mask of fields to be written in the assignment.
1062 const unsigned write_mask
= ((1U << count
) - 1) << row_base
;
1064 return new(mem_ctx
) ir_assignment(column_ref
, src
, NULL
, write_mask
);
1069 * Generate inline code for a matrix constructor
1071 * The generated constructor code will consist of a temporary variable
1072 * declaration of the same type as the constructor. A sequence of assignments
1073 * from constructor parameters to the temporary will follow.
1076 * An \c ir_dereference_variable of the temprorary generated in the constructor
1080 emit_inline_matrix_constructor(const glsl_type
*type
,
1081 exec_list
*instructions
,
1082 exec_list
*parameters
,
1085 assert(!parameters
->is_empty());
1087 ir_variable
*var
= new(ctx
) ir_variable(type
, "mat_ctor", ir_var_temporary
);
1088 instructions
->push_tail(var
);
1090 /* There are three kinds of matrix constructors.
1092 * - Construct a matrix from a single scalar by replicating that scalar to
1093 * along the diagonal of the matrix and setting all other components to
1096 * - Construct a matrix from an arbirary combination of vectors and
1097 * scalars. The components of the constructor parameters are assigned
1098 * to the matrix in colum-major order until the matrix is full.
1100 * - Construct a matrix from a single matrix. The source matrix is copied
1101 * to the upper left portion of the constructed matrix, and the remaining
1102 * elements take values from the identity matrix.
1104 ir_rvalue
*const first_param
= (ir_rvalue
*) parameters
->head
;
1105 if (single_scalar_parameter(parameters
)) {
1106 /* Assign the scalar to the X component of a vec4, and fill the remaining
1107 * components with zero.
1109 ir_variable
*rhs_var
=
1110 new(ctx
) ir_variable(glsl_type::vec4_type
, "mat_ctor_vec",
1112 instructions
->push_tail(rhs_var
);
1114 ir_constant_data zero
;
1120 ir_instruction
*inst
=
1121 new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(rhs_var
),
1122 new(ctx
) ir_constant(rhs_var
->type
, &zero
),
1124 instructions
->push_tail(inst
);
1126 ir_dereference
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1128 inst
= new(ctx
) ir_assignment(rhs_ref
, first_param
, NULL
, 0x01);
1129 instructions
->push_tail(inst
);
1131 /* Assign the temporary vector to each column of the destination matrix
1132 * with a swizzle that puts the X component on the diagonal of the
1133 * matrix. In some cases this may mean that the X component does not
1134 * get assigned into the column at all (i.e., when the matrix has more
1135 * columns than rows).
1137 static const unsigned rhs_swiz
[4][4] = {
1144 const unsigned cols_to_init
= MIN2(type
->matrix_columns
,
1145 type
->vector_elements
);
1146 for (unsigned i
= 0; i
< cols_to_init
; i
++) {
1147 ir_constant
*const col_idx
= new(ctx
) ir_constant(i
);
1148 ir_rvalue
*const col_ref
= new(ctx
) ir_dereference_array(var
, col_idx
);
1150 ir_rvalue
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1151 ir_rvalue
*const rhs
= new(ctx
) ir_swizzle(rhs_ref
, rhs_swiz
[i
],
1152 type
->vector_elements
);
1154 inst
= new(ctx
) ir_assignment(col_ref
, rhs
, NULL
);
1155 instructions
->push_tail(inst
);
1158 for (unsigned i
= cols_to_init
; i
< type
->matrix_columns
; i
++) {
1159 ir_constant
*const col_idx
= new(ctx
) ir_constant(i
);
1160 ir_rvalue
*const col_ref
= new(ctx
) ir_dereference_array(var
, col_idx
);
1162 ir_rvalue
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1163 ir_rvalue
*const rhs
= new(ctx
) ir_swizzle(rhs_ref
, 1, 1, 1, 1,
1164 type
->vector_elements
);
1166 inst
= new(ctx
) ir_assignment(col_ref
, rhs
, NULL
);
1167 instructions
->push_tail(inst
);
1169 } else if (first_param
->type
->is_matrix()) {
1170 /* From page 50 (56 of the PDF) of the GLSL 1.50 spec:
1172 * "If a matrix is constructed from a matrix, then each component
1173 * (column i, row j) in the result that has a corresponding
1174 * component (column i, row j) in the argument will be initialized
1175 * from there. All other components will be initialized to the
1176 * identity matrix. If a matrix argument is given to a matrix
1177 * constructor, it is an error to have any other arguments."
1179 assert(first_param
->next
->is_tail_sentinel());
1180 ir_rvalue
*const src_matrix
= first_param
;
1182 /* If the source matrix is smaller, pre-initialize the relavent parts of
1183 * the destination matrix to the identity matrix.
1185 if ((src_matrix
->type
->matrix_columns
< var
->type
->matrix_columns
)
1186 || (src_matrix
->type
->vector_elements
< var
->type
->vector_elements
)) {
1188 /* If the source matrix has fewer rows, every column of the destination
1189 * must be initialized. Otherwise only the columns in the destination
1190 * that do not exist in the source must be initialized.
1193 (src_matrix
->type
->vector_elements
< var
->type
->vector_elements
)
1194 ? 0 : src_matrix
->type
->matrix_columns
;
1196 const glsl_type
*const col_type
= var
->type
->column_type();
1197 for (/* empty */; col
< var
->type
->matrix_columns
; col
++) {
1198 ir_constant_data ident
;
1207 ir_rvalue
*const rhs
= new(ctx
) ir_constant(col_type
, &ident
);
1209 ir_rvalue
*const lhs
=
1210 new(ctx
) ir_dereference_array(var
, new(ctx
) ir_constant(col
));
1212 ir_instruction
*inst
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
1213 instructions
->push_tail(inst
);
1217 /* Assign columns from the source matrix to the destination matrix.
1219 * Since the parameter will be used in the RHS of multiple assignments,
1220 * generate a temporary and copy the paramter there.
1222 ir_variable
*const rhs_var
=
1223 new(ctx
) ir_variable(first_param
->type
, "mat_ctor_mat",
1225 instructions
->push_tail(rhs_var
);
1227 ir_dereference
*const rhs_var_ref
=
1228 new(ctx
) ir_dereference_variable(rhs_var
);
1229 ir_instruction
*const inst
=
1230 new(ctx
) ir_assignment(rhs_var_ref
, first_param
, NULL
);
1231 instructions
->push_tail(inst
);
1233 const unsigned last_row
= MIN2(src_matrix
->type
->vector_elements
,
1234 var
->type
->vector_elements
);
1235 const unsigned last_col
= MIN2(src_matrix
->type
->matrix_columns
,
1236 var
->type
->matrix_columns
);
1238 unsigned swiz
[4] = { 0, 0, 0, 0 };
1239 for (unsigned i
= 1; i
< last_row
; i
++)
1242 const unsigned write_mask
= (1U << last_row
) - 1;
1244 for (unsigned i
= 0; i
< last_col
; i
++) {
1245 ir_dereference
*const lhs
=
1246 new(ctx
) ir_dereference_array(var
, new(ctx
) ir_constant(i
));
1247 ir_rvalue
*const rhs_col
=
1248 new(ctx
) ir_dereference_array(rhs_var
, new(ctx
) ir_constant(i
));
1250 /* If one matrix has columns that are smaller than the columns of the
1251 * other matrix, wrap the column access of the larger with a swizzle
1252 * so that the LHS and RHS of the assignment have the same size (and
1253 * therefore have the same type).
1255 * It would be perfectly valid to unconditionally generate the
1256 * swizzles, this this will typically result in a more compact IR tree.
1259 if (lhs
->type
->vector_elements
!= rhs_col
->type
->vector_elements
) {
1260 rhs
= new(ctx
) ir_swizzle(rhs_col
, swiz
, last_row
);
1265 ir_instruction
*inst
=
1266 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, write_mask
);
1267 instructions
->push_tail(inst
);
1270 const unsigned cols
= type
->matrix_columns
;
1271 const unsigned rows
= type
->vector_elements
;
1272 unsigned col_idx
= 0;
1273 unsigned row_idx
= 0;
1275 foreach_list (node
, parameters
) {
1276 ir_rvalue
*const rhs
= (ir_rvalue
*) node
;
1277 const unsigned components_remaining_this_column
= rows
- row_idx
;
1278 unsigned rhs_components
= rhs
->type
->components();
1279 unsigned rhs_base
= 0;
1281 /* Since the parameter might be used in the RHS of two assignments,
1282 * generate a temporary and copy the paramter there.
1284 ir_variable
*rhs_var
=
1285 new(ctx
) ir_variable(rhs
->type
, "mat_ctor_vec", ir_var_temporary
);
1286 instructions
->push_tail(rhs_var
);
1288 ir_dereference
*rhs_var_ref
=
1289 new(ctx
) ir_dereference_variable(rhs_var
);
1290 ir_instruction
*inst
= new(ctx
) ir_assignment(rhs_var_ref
, rhs
, NULL
);
1291 instructions
->push_tail(inst
);
1293 /* Assign the current parameter to as many components of the matrix
1296 * NOTE: A single vector parameter can span two matrix columns. A
1297 * single vec4, for example, can completely fill a mat2.
1299 if (rhs_components
>= components_remaining_this_column
) {
1300 const unsigned count
= MIN2(rhs_components
,
1301 components_remaining_this_column
);
1303 rhs_var_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1305 ir_instruction
*inst
= assign_to_matrix_column(var
, col_idx
,
1309 instructions
->push_tail(inst
);
1317 /* If there is data left in the parameter and components left to be
1318 * set in the destination, emit another assignment. It is possible
1319 * that the assignment could be of a vec4 to the last element of the
1320 * matrix. In this case col_idx==cols, but there is still data
1321 * left in the source parameter. Obviously, don't emit an assignment
1322 * to data outside the destination matrix.
1324 if ((col_idx
< cols
) && (rhs_base
< rhs_components
)) {
1325 const unsigned count
= rhs_components
- rhs_base
;
1327 rhs_var_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1329 ir_instruction
*inst
= assign_to_matrix_column(var
, col_idx
,
1334 instructions
->push_tail(inst
);
1341 return new(ctx
) ir_dereference_variable(var
);
1346 emit_inline_record_constructor(const glsl_type
*type
,
1347 exec_list
*instructions
,
1348 exec_list
*parameters
,
1351 ir_variable
*const var
=
1352 new(mem_ctx
) ir_variable(type
, "record_ctor", ir_var_temporary
);
1353 ir_dereference_variable
*const d
= new(mem_ctx
) ir_dereference_variable(var
);
1355 instructions
->push_tail(var
);
1357 exec_node
*node
= parameters
->head
;
1358 for (unsigned i
= 0; i
< type
->length
; i
++) {
1359 assert(!node
->is_tail_sentinel());
1361 ir_dereference
*const lhs
=
1362 new(mem_ctx
) ir_dereference_record(d
->clone(mem_ctx
, NULL
),
1363 type
->fields
.structure
[i
].name
);
1365 ir_rvalue
*const rhs
= ((ir_instruction
*) node
)->as_rvalue();
1366 assert(rhs
!= NULL
);
1368 ir_instruction
*const assign
= new(mem_ctx
) ir_assignment(lhs
, rhs
, NULL
);
1370 instructions
->push_tail(assign
);
1379 process_record_constructor(exec_list
*instructions
,
1380 const glsl_type
*constructor_type
,
1381 YYLTYPE
*loc
, exec_list
*parameters
,
1382 struct _mesa_glsl_parse_state
*state
)
1385 exec_list actual_parameters
;
1387 process_parameters(instructions
, &actual_parameters
,
1390 exec_node
*node
= actual_parameters
.head
;
1391 for (unsigned i
= 0; i
< constructor_type
->length
; i
++) {
1392 ir_rvalue
*ir
= (ir_rvalue
*) node
;
1394 if (node
->is_tail_sentinel()) {
1395 _mesa_glsl_error(loc
, state
,
1396 "insufficient parameters to constructor for `%s'",
1397 constructor_type
->name
);
1398 return ir_rvalue::error_value(ctx
);
1401 if (apply_implicit_conversion(constructor_type
->fields
.structure
[i
].type
,
1403 node
->replace_with(ir
);
1405 _mesa_glsl_error(loc
, state
,
1406 "parameter type mismatch in constructor for `%s.%s' "
1408 constructor_type
->name
,
1409 constructor_type
->fields
.structure
[i
].name
,
1411 constructor_type
->fields
.structure
[i
].type
->name
);
1412 return ir_rvalue::error_value(ctx
);;
1418 if (!node
->is_tail_sentinel()) {
1419 _mesa_glsl_error(loc
, state
, "too many parameters in constructor "
1420 "for `%s'", constructor_type
->name
);
1421 return ir_rvalue::error_value(ctx
);
1424 ir_rvalue
*const constant
=
1425 constant_record_constructor(constructor_type
, &actual_parameters
,
1428 return (constant
!= NULL
)
1430 : emit_inline_record_constructor(constructor_type
, instructions
,
1431 &actual_parameters
, state
);
1436 ast_function_expression::hir(exec_list
*instructions
,
1437 struct _mesa_glsl_parse_state
*state
)
1440 /* There are three sorts of function calls.
1442 * 1. constructors - The first subexpression is an ast_type_specifier.
1443 * 2. methods - Only the .length() method of array types.
1444 * 3. functions - Calls to regular old functions.
1446 * Method calls are actually detected when the ast_field_selection
1447 * expression is handled.
1449 if (is_constructor()) {
1450 const ast_type_specifier
*type
= (ast_type_specifier
*) subexpressions
[0];
1451 YYLTYPE loc
= type
->get_location();
1454 const glsl_type
*const constructor_type
= type
->glsl_type(& name
, state
);
1456 /* constructor_type can be NULL if a variable with the same name as the
1457 * structure has come into scope.
1459 if (constructor_type
== NULL
) {
1460 _mesa_glsl_error(& loc
, state
, "unknown type `%s' (structure name "
1461 "may be shadowed by a variable with the same name)",
1463 return ir_rvalue::error_value(ctx
);
1467 /* Constructors for samplers are illegal.
1469 if (constructor_type
->is_sampler()) {
1470 _mesa_glsl_error(& loc
, state
, "cannot construct sampler type `%s'",
1471 constructor_type
->name
);
1472 return ir_rvalue::error_value(ctx
);
1475 if (constructor_type
->is_array()) {
1476 if (!state
->check_version(120, 300, &loc
,
1477 "array constructors forbidden")) {
1478 return ir_rvalue::error_value(ctx
);
1481 return process_array_constructor(instructions
, constructor_type
,
1482 & loc
, &this->expressions
, state
);
1486 /* There are two kinds of constructor calls. Constructors for arrays and
1487 * structures must have the exact number of arguments with matching types
1488 * in the correct order. These constructors follow essentially the same
1489 * type matching rules as functions.
1491 * Constructors for built-in language types, such as mat4 and vec2, are
1492 * free form. The only requirements are that the parameters must provide
1493 * enough values of the correct scalar type and that no arguments are
1494 * given past the last used argument.
1496 * When using the C-style initializer syntax from GLSL 4.20, constructors
1497 * must have the exact number of arguments with matching types in the
1500 if (constructor_type
->is_record()) {
1501 return process_record_constructor(instructions
, constructor_type
,
1502 &loc
, &this->expressions
,
1506 if (!constructor_type
->is_numeric() && !constructor_type
->is_boolean())
1507 return ir_rvalue::error_value(ctx
);
1509 /* Total number of components of the type being constructed. */
1510 const unsigned type_components
= constructor_type
->components();
1512 /* Number of components from parameters that have actually been
1513 * consumed. This is used to perform several kinds of error checking.
1515 unsigned components_used
= 0;
1517 unsigned matrix_parameters
= 0;
1518 unsigned nonmatrix_parameters
= 0;
1519 exec_list actual_parameters
;
1521 foreach_list (n
, &this->expressions
) {
1522 ast_node
*ast
= exec_node_data(ast_node
, n
, link
);
1523 ir_rvalue
*result
= ast
->hir(instructions
, state
)->as_rvalue();
1525 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
1527 * "It is an error to provide extra arguments beyond this
1528 * last used argument."
1530 if (components_used
>= type_components
) {
1531 _mesa_glsl_error(& loc
, state
, "too many parameters to `%s' "
1533 constructor_type
->name
);
1534 return ir_rvalue::error_value(ctx
);
1537 if (!result
->type
->is_numeric() && !result
->type
->is_boolean()) {
1538 _mesa_glsl_error(& loc
, state
, "cannot construct `%s' from a "
1539 "non-numeric data type",
1540 constructor_type
->name
);
1541 return ir_rvalue::error_value(ctx
);
1544 /* Count the number of matrix and nonmatrix parameters. This
1545 * is used below to enforce some of the constructor rules.
1547 if (result
->type
->is_matrix())
1548 matrix_parameters
++;
1550 nonmatrix_parameters
++;
1552 actual_parameters
.push_tail(result
);
1553 components_used
+= result
->type
->components();
1556 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
1558 * "It is an error to construct matrices from other matrices. This
1559 * is reserved for future use."
1561 if (matrix_parameters
> 0
1562 && constructor_type
->is_matrix()
1563 && !state
->check_version(120, 100, &loc
,
1564 "cannot construct `%s' from a matrix",
1565 constructor_type
->name
)) {
1566 return ir_rvalue::error_value(ctx
);
1569 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
1571 * "If a matrix argument is given to a matrix constructor, it is
1572 * an error to have any other arguments."
1574 if ((matrix_parameters
> 0)
1575 && ((matrix_parameters
+ nonmatrix_parameters
) > 1)
1576 && constructor_type
->is_matrix()) {
1577 _mesa_glsl_error(& loc
, state
, "for matrix `%s' constructor, "
1578 "matrix must be only parameter",
1579 constructor_type
->name
);
1580 return ir_rvalue::error_value(ctx
);
1583 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
1585 * "In these cases, there must be enough components provided in the
1586 * arguments to provide an initializer for every component in the
1587 * constructed value."
1589 if (components_used
< type_components
&& components_used
!= 1
1590 && matrix_parameters
== 0) {
1591 _mesa_glsl_error(& loc
, state
, "too few components to construct "
1593 constructor_type
->name
);
1594 return ir_rvalue::error_value(ctx
);
1597 /* Later, we cast each parameter to the same base type as the
1598 * constructor. Since there are no non-floating point matrices, we
1599 * need to break them up into a series of column vectors.
1601 if (constructor_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1602 foreach_list_safe(n
, &actual_parameters
) {
1603 ir_rvalue
*matrix
= (ir_rvalue
*) n
;
1605 if (!matrix
->type
->is_matrix())
1608 /* Create a temporary containing the matrix. */
1609 ir_variable
*var
= new(ctx
) ir_variable(matrix
->type
, "matrix_tmp",
1611 instructions
->push_tail(var
);
1612 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
)
1613 ir_dereference_variable(var
), matrix
, NULL
));
1614 var
->constant_value
= matrix
->constant_expression_value();
1616 /* Replace the matrix with dereferences of its columns. */
1617 for (int i
= 0; i
< matrix
->type
->matrix_columns
; i
++) {
1618 matrix
->insert_before(new (ctx
) ir_dereference_array(var
,
1619 new(ctx
) ir_constant(i
)));
1625 bool all_parameters_are_constant
= true;
1627 /* Type cast each parameter and, if possible, fold constants.*/
1628 foreach_list_safe(n
, &actual_parameters
) {
1629 ir_rvalue
*ir
= (ir_rvalue
*) n
;
1631 const glsl_type
*desired_type
=
1632 glsl_type::get_instance(constructor_type
->base_type
,
1633 ir
->type
->vector_elements
,
1634 ir
->type
->matrix_columns
);
1635 ir_rvalue
*result
= convert_component(ir
, desired_type
);
1637 /* Attempt to convert the parameter to a constant valued expression.
1638 * After doing so, track whether or not all the parameters to the
1639 * constructor are trivially constant valued expressions.
1641 ir_rvalue
*const constant
= result
->constant_expression_value();
1643 if (constant
!= NULL
)
1646 all_parameters_are_constant
= false;
1649 ir
->replace_with(result
);
1653 /* If all of the parameters are trivially constant, create a
1654 * constant representing the complete collection of parameters.
1656 if (all_parameters_are_constant
) {
1657 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
1658 } else if (constructor_type
->is_scalar()) {
1659 return dereference_component((ir_rvalue
*) actual_parameters
.head
,
1661 } else if (constructor_type
->is_vector()) {
1662 return emit_inline_vector_constructor(constructor_type
,
1667 assert(constructor_type
->is_matrix());
1668 return emit_inline_matrix_constructor(constructor_type
,
1674 const ast_expression
*id
= subexpressions
[0];
1675 const char *func_name
= id
->primary_expression
.identifier
;
1676 YYLTYPE loc
= id
->get_location();
1677 exec_list actual_parameters
;
1679 process_parameters(instructions
, &actual_parameters
, &this->expressions
,
1682 ir_function_signature
*sig
=
1683 match_function_by_name(func_name
, &actual_parameters
, state
);
1685 ir_call
*call
= NULL
;
1686 ir_rvalue
*value
= NULL
;
1688 no_matching_function_error(func_name
, &loc
, &actual_parameters
, state
);
1689 value
= ir_rvalue::error_value(ctx
);
1690 } else if (!verify_parameter_modes(state
, sig
, actual_parameters
, this->expressions
)) {
1691 /* an error has already been emitted */
1692 value
= ir_rvalue::error_value(ctx
);
1694 value
= generate_call(instructions
, sig
, &actual_parameters
,
1701 return ir_rvalue::error_value(ctx
);
1705 ast_aggregate_initializer::hir(exec_list
*instructions
,
1706 struct _mesa_glsl_parse_state
*state
)
1709 YYLTYPE loc
= this->get_location();
1712 if (!this->constructor_type
) {
1713 _mesa_glsl_error(&loc
, state
, "type of C-style initializer unknown");
1714 return ir_rvalue::error_value(ctx
);
1716 const glsl_type
*const constructor_type
=
1717 this->constructor_type
->glsl_type(&name
, state
);
1719 if (!state
->ARB_shading_language_420pack_enable
) {
1720 _mesa_glsl_error(&loc
, state
, "C-style initialization requires the "
1721 "GL_ARB_shading_language_420pack extension");
1722 return ir_rvalue::error_value(ctx
);
1725 if (this->constructor_type
->is_array
) {
1726 return process_array_constructor(instructions
, constructor_type
, &loc
,
1727 &this->expressions
, state
);
1730 if (this->constructor_type
->structure
) {
1731 return process_record_constructor(instructions
, constructor_type
, &loc
,
1732 &this->expressions
, state
);
1735 return process_vec_mat_constructor(instructions
, constructor_type
, &loc
,
1736 &this->expressions
, state
);