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
->data
.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 print_function_prototypes(_mesa_glsl_parse_state
*state
, YYLTYPE
*loc
,
431 foreach_list (node
, &f
->signatures
) {
432 ir_function_signature
*sig
= (ir_function_signature
*) node
;
434 if (sig
->is_builtin() && !sig
->is_builtin_available(state
))
437 char *str
= prototype_string(sig
->return_type
, f
->name
, &sig
->parameters
);
438 _mesa_glsl_error(loc
, state
, " %s", str
);
444 * Raise a "no matching function" error, listing all possible overloads the
445 * compiler considered so developers can figure out what went wrong.
448 no_matching_function_error(const char *name
,
450 exec_list
*actual_parameters
,
451 _mesa_glsl_parse_state
*state
)
453 char *str
= prototype_string(NULL
, name
, actual_parameters
);
454 _mesa_glsl_error(loc
, state
,
455 "no matching function for call to `%s'; candidates are:",
459 print_function_prototypes(state
, loc
, state
->symbols
->get_function(name
));
461 if (state
->uses_builtin_functions
) {
462 gl_shader
*sh
= _mesa_glsl_get_builtin_function_shader();
463 print_function_prototypes(state
, loc
, sh
->symbols
->get_function(name
));
468 * Perform automatic type conversion of constructor parameters
470 * This implements the rules in the "Conversion and Scalar Constructors"
471 * section (GLSL 1.10 section 5.4.1), not the "Implicit Conversions" rules.
474 convert_component(ir_rvalue
*src
, const glsl_type
*desired_type
)
476 void *ctx
= ralloc_parent(src
);
477 const unsigned a
= desired_type
->base_type
;
478 const unsigned b
= src
->type
->base_type
;
479 ir_expression
*result
= NULL
;
481 if (src
->type
->is_error())
484 assert(a
<= GLSL_TYPE_BOOL
);
485 assert(b
<= GLSL_TYPE_BOOL
);
494 result
= new(ctx
) ir_expression(ir_unop_i2u
, src
);
496 case GLSL_TYPE_FLOAT
:
497 result
= new(ctx
) ir_expression(ir_unop_f2u
, src
);
500 result
= new(ctx
) ir_expression(ir_unop_i2u
,
501 new(ctx
) ir_expression(ir_unop_b2i
, src
));
508 result
= new(ctx
) ir_expression(ir_unop_u2i
, src
);
510 case GLSL_TYPE_FLOAT
:
511 result
= new(ctx
) ir_expression(ir_unop_f2i
, src
);
514 result
= new(ctx
) ir_expression(ir_unop_b2i
, src
);
518 case GLSL_TYPE_FLOAT
:
521 result
= new(ctx
) ir_expression(ir_unop_u2f
, desired_type
, src
, NULL
);
524 result
= new(ctx
) ir_expression(ir_unop_i2f
, desired_type
, src
, NULL
);
527 result
= new(ctx
) ir_expression(ir_unop_b2f
, desired_type
, src
, NULL
);
534 result
= new(ctx
) ir_expression(ir_unop_i2b
,
535 new(ctx
) ir_expression(ir_unop_u2i
, src
));
538 result
= new(ctx
) ir_expression(ir_unop_i2b
, desired_type
, src
, NULL
);
540 case GLSL_TYPE_FLOAT
:
541 result
= new(ctx
) ir_expression(ir_unop_f2b
, desired_type
, src
, NULL
);
547 assert(result
!= NULL
);
548 assert(result
->type
== desired_type
);
550 /* Try constant folding; it may fold in the conversion we just added. */
551 ir_constant
*const constant
= result
->constant_expression_value();
552 return (constant
!= NULL
) ? (ir_rvalue
*) constant
: (ir_rvalue
*) result
;
556 * Dereference a specific component from a scalar, vector, or matrix
559 dereference_component(ir_rvalue
*src
, unsigned component
)
561 void *ctx
= ralloc_parent(src
);
562 assert(component
< src
->type
->components());
564 /* If the source is a constant, just create a new constant instead of a
565 * dereference of the existing constant.
567 ir_constant
*constant
= src
->as_constant();
569 return new(ctx
) ir_constant(constant
, component
);
571 if (src
->type
->is_scalar()) {
573 } else if (src
->type
->is_vector()) {
574 return new(ctx
) ir_swizzle(src
, component
, 0, 0, 0, 1);
576 assert(src
->type
->is_matrix());
578 /* Dereference a row of the matrix, then call this function again to get
579 * a specific element from that row.
581 const int c
= component
/ src
->type
->column_type()->vector_elements
;
582 const int r
= component
% src
->type
->column_type()->vector_elements
;
583 ir_constant
*const col_index
= new(ctx
) ir_constant(c
);
584 ir_dereference
*const col
= new(ctx
) ir_dereference_array(src
, col_index
);
586 col
->type
= src
->type
->column_type();
588 return dereference_component(col
, r
);
591 assert(!"Should not get here.");
597 process_vec_mat_constructor(exec_list
*instructions
,
598 const glsl_type
*constructor_type
,
599 YYLTYPE
*loc
, exec_list
*parameters
,
600 struct _mesa_glsl_parse_state
*state
)
604 /* The ARB_shading_language_420pack spec says:
606 * "If an initializer is a list of initializers enclosed in curly braces,
607 * the variable being declared must be a vector, a matrix, an array, or a
610 * int i = { 1 }; // illegal, i is not an aggregate"
612 if (constructor_type
->vector_elements
<= 1) {
613 _mesa_glsl_error(loc
, state
, "aggregates can only initialize vectors, "
614 "matrices, arrays, and structs");
615 return ir_rvalue::error_value(ctx
);
618 exec_list actual_parameters
;
619 const unsigned parameter_count
=
620 process_parameters(instructions
, &actual_parameters
, parameters
, state
);
622 if (parameter_count
== 0
623 || (constructor_type
->is_vector() &&
624 constructor_type
->vector_elements
!= parameter_count
)
625 || (constructor_type
->is_matrix() &&
626 constructor_type
->matrix_columns
!= parameter_count
)) {
627 _mesa_glsl_error(loc
, state
, "%s constructor must have %u parameters",
628 constructor_type
->is_vector() ? "vector" : "matrix",
629 constructor_type
->vector_elements
);
630 return ir_rvalue::error_value(ctx
);
633 bool all_parameters_are_constant
= true;
635 /* Type cast each parameter and, if possible, fold constants. */
636 foreach_list_safe(n
, &actual_parameters
) {
637 ir_rvalue
*ir
= (ir_rvalue
*) n
;
638 ir_rvalue
*result
= ir
;
640 /* Apply implicit conversions (not the scalar constructor rules!). See
641 * the spec quote above. */
642 if (constructor_type
->is_float()) {
643 const glsl_type
*desired_type
=
644 glsl_type::get_instance(GLSL_TYPE_FLOAT
,
645 ir
->type
->vector_elements
,
646 ir
->type
->matrix_columns
);
647 if (result
->type
->can_implicitly_convert_to(desired_type
)) {
648 /* Even though convert_component() implements the constructor
649 * conversion rules (not the implicit conversion rules), its safe
650 * to use it here because we already checked that the implicit
651 * conversion is legal.
653 result
= convert_component(ir
, desired_type
);
657 if (constructor_type
->is_matrix()) {
658 if (result
->type
!= constructor_type
->column_type()) {
659 _mesa_glsl_error(loc
, state
, "type error in matrix constructor: "
660 "expected: %s, found %s",
661 constructor_type
->column_type()->name
,
663 return ir_rvalue::error_value(ctx
);
665 } else if (result
->type
!= constructor_type
->get_scalar_type()) {
666 _mesa_glsl_error(loc
, state
, "type error in vector constructor: "
667 "expected: %s, found %s",
668 constructor_type
->get_scalar_type()->name
,
670 return ir_rvalue::error_value(ctx
);
673 /* Attempt to convert the parameter to a constant valued expression.
674 * After doing so, track whether or not all the parameters to the
675 * constructor are trivially constant valued expressions.
677 ir_rvalue
*const constant
= result
->constant_expression_value();
679 if (constant
!= NULL
)
682 all_parameters_are_constant
= false;
684 ir
->replace_with(result
);
687 if (all_parameters_are_constant
)
688 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
690 ir_variable
*var
= new(ctx
) ir_variable(constructor_type
, "vec_mat_ctor",
692 instructions
->push_tail(var
);
695 foreach_list(node
, &actual_parameters
) {
696 ir_rvalue
*rhs
= (ir_rvalue
*) node
;
697 ir_rvalue
*lhs
= new(ctx
) ir_dereference_array(var
,
698 new(ctx
) ir_constant(i
));
700 ir_instruction
*assignment
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
701 instructions
->push_tail(assignment
);
706 return new(ctx
) ir_dereference_variable(var
);
711 process_array_constructor(exec_list
*instructions
,
712 const glsl_type
*constructor_type
,
713 YYLTYPE
*loc
, exec_list
*parameters
,
714 struct _mesa_glsl_parse_state
*state
)
717 /* Array constructors come in two forms: sized and unsized. Sized array
718 * constructors look like 'vec4[2](a, b)', where 'a' and 'b' are vec4
719 * variables. In this case the number of parameters must exactly match the
720 * specified size of the array.
722 * Unsized array constructors look like 'vec4[](a, b)', where 'a' and 'b'
723 * are vec4 variables. In this case the size of the array being constructed
724 * is determined by the number of parameters.
726 * From page 52 (page 58 of the PDF) of the GLSL 1.50 spec:
728 * "There must be exactly the same number of arguments as the size of
729 * the array being constructed. If no size is present in the
730 * constructor, then the array is explicitly sized to the number of
731 * arguments provided. The arguments are assigned in order, starting at
732 * element 0, to the elements of the constructed array. Each argument
733 * must be the same type as the element type of the array, or be a type
734 * that can be converted to the element type of the array according to
735 * Section 4.1.10 "Implicit Conversions.""
737 exec_list actual_parameters
;
738 const unsigned parameter_count
=
739 process_parameters(instructions
, &actual_parameters
, parameters
, state
);
740 bool is_unsized_array
= constructor_type
->is_unsized_array();
742 if ((parameter_count
== 0) ||
743 (!is_unsized_array
&& (constructor_type
->length
!= parameter_count
))) {
744 const unsigned min_param
= is_unsized_array
745 ? 1 : constructor_type
->length
;
747 _mesa_glsl_error(loc
, state
, "array constructor must have %s %u "
749 is_unsized_array
? "at least" : "exactly",
750 min_param
, (min_param
<= 1) ? "" : "s");
751 return ir_rvalue::error_value(ctx
);
754 if (is_unsized_array
) {
756 glsl_type::get_array_instance(constructor_type
->element_type(),
758 assert(constructor_type
!= NULL
);
759 assert(constructor_type
->length
== parameter_count
);
762 bool all_parameters_are_constant
= true;
764 /* Type cast each parameter and, if possible, fold constants. */
765 foreach_list_safe(n
, &actual_parameters
) {
766 ir_rvalue
*ir
= (ir_rvalue
*) n
;
767 ir_rvalue
*result
= ir
;
769 /* Apply implicit conversions (not the scalar constructor rules!). See
770 * the spec quote above. */
771 if (constructor_type
->element_type()->is_float()) {
772 const glsl_type
*desired_type
=
773 glsl_type::get_instance(GLSL_TYPE_FLOAT
,
774 ir
->type
->vector_elements
,
775 ir
->type
->matrix_columns
);
776 if (result
->type
->can_implicitly_convert_to(desired_type
)) {
777 /* Even though convert_component() implements the constructor
778 * conversion rules (not the implicit conversion rules), its safe
779 * to use it here because we already checked that the implicit
780 * conversion is legal.
782 result
= convert_component(ir
, desired_type
);
786 if (result
->type
!= constructor_type
->element_type()) {
787 _mesa_glsl_error(loc
, state
, "type error in array constructor: "
788 "expected: %s, found %s",
789 constructor_type
->element_type()->name
,
791 return ir_rvalue::error_value(ctx
);
794 /* Attempt to convert the parameter to a constant valued expression.
795 * After doing so, track whether or not all the parameters to the
796 * constructor are trivially constant valued expressions.
798 ir_rvalue
*const constant
= result
->constant_expression_value();
800 if (constant
!= NULL
)
803 all_parameters_are_constant
= false;
805 ir
->replace_with(result
);
808 if (all_parameters_are_constant
)
809 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
811 ir_variable
*var
= new(ctx
) ir_variable(constructor_type
, "array_ctor",
813 instructions
->push_tail(var
);
816 foreach_list(node
, &actual_parameters
) {
817 ir_rvalue
*rhs
= (ir_rvalue
*) node
;
818 ir_rvalue
*lhs
= new(ctx
) ir_dereference_array(var
,
819 new(ctx
) ir_constant(i
));
821 ir_instruction
*assignment
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
822 instructions
->push_tail(assignment
);
827 return new(ctx
) ir_dereference_variable(var
);
832 * Try to convert a record constructor to a constant expression
835 constant_record_constructor(const glsl_type
*constructor_type
,
836 exec_list
*parameters
, void *mem_ctx
)
838 foreach_list(node
, parameters
) {
839 ir_constant
*constant
= ((ir_instruction
*) node
)->as_constant();
840 if (constant
== NULL
)
842 node
->replace_with(constant
);
845 return new(mem_ctx
) ir_constant(constructor_type
, parameters
);
850 * Determine if a list consists of a single scalar r-value
853 single_scalar_parameter(exec_list
*parameters
)
855 const ir_rvalue
*const p
= (ir_rvalue
*) parameters
->head
;
856 assert(((ir_rvalue
*)p
)->as_rvalue() != NULL
);
858 return (p
->type
->is_scalar() && p
->next
->is_tail_sentinel());
863 * Generate inline code for a vector constructor
865 * The generated constructor code will consist of a temporary variable
866 * declaration of the same type as the constructor. A sequence of assignments
867 * from constructor parameters to the temporary will follow.
870 * An \c ir_dereference_variable of the temprorary generated in the constructor
874 emit_inline_vector_constructor(const glsl_type
*type
,
875 exec_list
*instructions
,
876 exec_list
*parameters
,
879 assert(!parameters
->is_empty());
881 ir_variable
*var
= new(ctx
) ir_variable(type
, "vec_ctor", ir_var_temporary
);
882 instructions
->push_tail(var
);
884 /* There are two kinds of vector constructors.
886 * - Construct a vector from a single scalar by replicating that scalar to
887 * all components of the vector.
889 * - Construct a vector from an arbirary combination of vectors and
890 * scalars. The components of the constructor parameters are assigned
891 * to the vector in order until the vector is full.
893 const unsigned lhs_components
= type
->components();
894 if (single_scalar_parameter(parameters
)) {
895 ir_rvalue
*first_param
= (ir_rvalue
*)parameters
->head
;
896 ir_rvalue
*rhs
= new(ctx
) ir_swizzle(first_param
, 0, 0, 0, 0,
898 ir_dereference_variable
*lhs
= new(ctx
) ir_dereference_variable(var
);
899 const unsigned mask
= (1U << lhs_components
) - 1;
901 assert(rhs
->type
== lhs
->type
);
903 ir_instruction
*inst
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
, mask
);
904 instructions
->push_tail(inst
);
906 unsigned base_component
= 0;
907 unsigned base_lhs_component
= 0;
908 ir_constant_data data
;
909 unsigned constant_mask
= 0, constant_components
= 0;
911 memset(&data
, 0, sizeof(data
));
913 foreach_list(node
, parameters
) {
914 ir_rvalue
*param
= (ir_rvalue
*) node
;
915 unsigned rhs_components
= param
->type
->components();
917 /* Do not try to assign more components to the vector than it has!
919 if ((rhs_components
+ base_lhs_component
) > lhs_components
) {
920 rhs_components
= lhs_components
- base_lhs_component
;
923 const ir_constant
*const c
= param
->as_constant();
925 for (unsigned i
= 0; i
< rhs_components
; i
++) {
926 switch (c
->type
->base_type
) {
928 data
.u
[i
+ base_component
] = c
->get_uint_component(i
);
931 data
.i
[i
+ base_component
] = c
->get_int_component(i
);
933 case GLSL_TYPE_FLOAT
:
934 data
.f
[i
+ base_component
] = c
->get_float_component(i
);
937 data
.b
[i
+ base_component
] = c
->get_bool_component(i
);
940 assert(!"Should not get here.");
945 /* Mask of fields to be written in the assignment.
947 constant_mask
|= ((1U << rhs_components
) - 1) << base_lhs_component
;
948 constant_components
+= rhs_components
;
950 base_component
+= rhs_components
;
952 /* Advance the component index by the number of components
953 * that were just assigned.
955 base_lhs_component
+= rhs_components
;
958 if (constant_mask
!= 0) {
959 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
960 const glsl_type
*rhs_type
= glsl_type::get_instance(var
->type
->base_type
,
963 ir_rvalue
*rhs
= new(ctx
) ir_constant(rhs_type
, &data
);
965 ir_instruction
*inst
=
966 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, constant_mask
);
967 instructions
->push_tail(inst
);
971 foreach_list(node
, parameters
) {
972 ir_rvalue
*param
= (ir_rvalue
*) node
;
973 unsigned rhs_components
= param
->type
->components();
975 /* Do not try to assign more components to the vector than it has!
977 if ((rhs_components
+ base_component
) > lhs_components
) {
978 rhs_components
= lhs_components
- base_component
;
981 const ir_constant
*const c
= param
->as_constant();
983 /* Mask of fields to be written in the assignment.
985 const unsigned write_mask
= ((1U << rhs_components
) - 1)
988 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
990 /* Generate a swizzle so that LHS and RHS sizes match.
993 new(ctx
) ir_swizzle(param
, 0, 1, 2, 3, rhs_components
);
995 ir_instruction
*inst
=
996 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, write_mask
);
997 instructions
->push_tail(inst
);
1000 /* Advance the component index by the number of components that were
1003 base_component
+= rhs_components
;
1006 return new(ctx
) ir_dereference_variable(var
);
1011 * Generate assignment of a portion of a vector to a portion of a matrix column
1013 * \param src_base First component of the source to be used in assignment
1014 * \param column Column of destination to be assiged
1015 * \param row_base First component of the destination column to be assigned
1016 * \param count Number of components to be assigned
1019 * \c src_base + \c count must be less than or equal to the number of components
1020 * in the source vector.
1023 assign_to_matrix_column(ir_variable
*var
, unsigned column
, unsigned row_base
,
1024 ir_rvalue
*src
, unsigned src_base
, unsigned count
,
1027 ir_constant
*col_idx
= new(mem_ctx
) ir_constant(column
);
1028 ir_dereference
*column_ref
= new(mem_ctx
) ir_dereference_array(var
, col_idx
);
1030 assert(column_ref
->type
->components() >= (row_base
+ count
));
1031 assert(src
->type
->components() >= (src_base
+ count
));
1033 /* Generate a swizzle that extracts the number of components from the source
1034 * that are to be assigned to the column of the matrix.
1036 if (count
< src
->type
->vector_elements
) {
1037 src
= new(mem_ctx
) ir_swizzle(src
,
1038 src_base
+ 0, src_base
+ 1,
1039 src_base
+ 2, src_base
+ 3,
1043 /* Mask of fields to be written in the assignment.
1045 const unsigned write_mask
= ((1U << count
) - 1) << row_base
;
1047 return new(mem_ctx
) ir_assignment(column_ref
, src
, NULL
, write_mask
);
1052 * Generate inline code for a matrix constructor
1054 * The generated constructor code will consist of a temporary variable
1055 * declaration of the same type as the constructor. A sequence of assignments
1056 * from constructor parameters to the temporary will follow.
1059 * An \c ir_dereference_variable of the temprorary generated in the constructor
1063 emit_inline_matrix_constructor(const glsl_type
*type
,
1064 exec_list
*instructions
,
1065 exec_list
*parameters
,
1068 assert(!parameters
->is_empty());
1070 ir_variable
*var
= new(ctx
) ir_variable(type
, "mat_ctor", ir_var_temporary
);
1071 instructions
->push_tail(var
);
1073 /* There are three kinds of matrix constructors.
1075 * - Construct a matrix from a single scalar by replicating that scalar to
1076 * along the diagonal of the matrix and setting all other components to
1079 * - Construct a matrix from an arbirary combination of vectors and
1080 * scalars. The components of the constructor parameters are assigned
1081 * to the matrix in colum-major order until the matrix is full.
1083 * - Construct a matrix from a single matrix. The source matrix is copied
1084 * to the upper left portion of the constructed matrix, and the remaining
1085 * elements take values from the identity matrix.
1087 ir_rvalue
*const first_param
= (ir_rvalue
*) parameters
->head
;
1088 if (single_scalar_parameter(parameters
)) {
1089 /* Assign the scalar to the X component of a vec4, and fill the remaining
1090 * components with zero.
1092 ir_variable
*rhs_var
=
1093 new(ctx
) ir_variable(glsl_type::vec4_type
, "mat_ctor_vec",
1095 instructions
->push_tail(rhs_var
);
1097 ir_constant_data zero
;
1103 ir_instruction
*inst
=
1104 new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(rhs_var
),
1105 new(ctx
) ir_constant(rhs_var
->type
, &zero
),
1107 instructions
->push_tail(inst
);
1109 ir_dereference
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1111 inst
= new(ctx
) ir_assignment(rhs_ref
, first_param
, NULL
, 0x01);
1112 instructions
->push_tail(inst
);
1114 /* Assign the temporary vector to each column of the destination matrix
1115 * with a swizzle that puts the X component on the diagonal of the
1116 * matrix. In some cases this may mean that the X component does not
1117 * get assigned into the column at all (i.e., when the matrix has more
1118 * columns than rows).
1120 static const unsigned rhs_swiz
[4][4] = {
1127 const unsigned cols_to_init
= MIN2(type
->matrix_columns
,
1128 type
->vector_elements
);
1129 for (unsigned i
= 0; i
< cols_to_init
; i
++) {
1130 ir_constant
*const col_idx
= new(ctx
) ir_constant(i
);
1131 ir_rvalue
*const col_ref
= new(ctx
) ir_dereference_array(var
, col_idx
);
1133 ir_rvalue
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1134 ir_rvalue
*const rhs
= new(ctx
) ir_swizzle(rhs_ref
, rhs_swiz
[i
],
1135 type
->vector_elements
);
1137 inst
= new(ctx
) ir_assignment(col_ref
, rhs
, NULL
);
1138 instructions
->push_tail(inst
);
1141 for (unsigned i
= cols_to_init
; i
< type
->matrix_columns
; i
++) {
1142 ir_constant
*const col_idx
= new(ctx
) ir_constant(i
);
1143 ir_rvalue
*const col_ref
= new(ctx
) ir_dereference_array(var
, col_idx
);
1145 ir_rvalue
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1146 ir_rvalue
*const rhs
= new(ctx
) ir_swizzle(rhs_ref
, 1, 1, 1, 1,
1147 type
->vector_elements
);
1149 inst
= new(ctx
) ir_assignment(col_ref
, rhs
, NULL
);
1150 instructions
->push_tail(inst
);
1152 } else if (first_param
->type
->is_matrix()) {
1153 /* From page 50 (56 of the PDF) of the GLSL 1.50 spec:
1155 * "If a matrix is constructed from a matrix, then each component
1156 * (column i, row j) in the result that has a corresponding
1157 * component (column i, row j) in the argument will be initialized
1158 * from there. All other components will be initialized to the
1159 * identity matrix. If a matrix argument is given to a matrix
1160 * constructor, it is an error to have any other arguments."
1162 assert(first_param
->next
->is_tail_sentinel());
1163 ir_rvalue
*const src_matrix
= first_param
;
1165 /* If the source matrix is smaller, pre-initialize the relavent parts of
1166 * the destination matrix to the identity matrix.
1168 if ((src_matrix
->type
->matrix_columns
< var
->type
->matrix_columns
)
1169 || (src_matrix
->type
->vector_elements
< var
->type
->vector_elements
)) {
1171 /* If the source matrix has fewer rows, every column of the destination
1172 * must be initialized. Otherwise only the columns in the destination
1173 * that do not exist in the source must be initialized.
1176 (src_matrix
->type
->vector_elements
< var
->type
->vector_elements
)
1177 ? 0 : src_matrix
->type
->matrix_columns
;
1179 const glsl_type
*const col_type
= var
->type
->column_type();
1180 for (/* empty */; col
< var
->type
->matrix_columns
; col
++) {
1181 ir_constant_data ident
;
1190 ir_rvalue
*const rhs
= new(ctx
) ir_constant(col_type
, &ident
);
1192 ir_rvalue
*const lhs
=
1193 new(ctx
) ir_dereference_array(var
, new(ctx
) ir_constant(col
));
1195 ir_instruction
*inst
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
1196 instructions
->push_tail(inst
);
1200 /* Assign columns from the source matrix to the destination matrix.
1202 * Since the parameter will be used in the RHS of multiple assignments,
1203 * generate a temporary and copy the paramter there.
1205 ir_variable
*const rhs_var
=
1206 new(ctx
) ir_variable(first_param
->type
, "mat_ctor_mat",
1208 instructions
->push_tail(rhs_var
);
1210 ir_dereference
*const rhs_var_ref
=
1211 new(ctx
) ir_dereference_variable(rhs_var
);
1212 ir_instruction
*const inst
=
1213 new(ctx
) ir_assignment(rhs_var_ref
, first_param
, NULL
);
1214 instructions
->push_tail(inst
);
1216 const unsigned last_row
= MIN2(src_matrix
->type
->vector_elements
,
1217 var
->type
->vector_elements
);
1218 const unsigned last_col
= MIN2(src_matrix
->type
->matrix_columns
,
1219 var
->type
->matrix_columns
);
1221 unsigned swiz
[4] = { 0, 0, 0, 0 };
1222 for (unsigned i
= 1; i
< last_row
; i
++)
1225 const unsigned write_mask
= (1U << last_row
) - 1;
1227 for (unsigned i
= 0; i
< last_col
; i
++) {
1228 ir_dereference
*const lhs
=
1229 new(ctx
) ir_dereference_array(var
, new(ctx
) ir_constant(i
));
1230 ir_rvalue
*const rhs_col
=
1231 new(ctx
) ir_dereference_array(rhs_var
, new(ctx
) ir_constant(i
));
1233 /* If one matrix has columns that are smaller than the columns of the
1234 * other matrix, wrap the column access of the larger with a swizzle
1235 * so that the LHS and RHS of the assignment have the same size (and
1236 * therefore have the same type).
1238 * It would be perfectly valid to unconditionally generate the
1239 * swizzles, this this will typically result in a more compact IR tree.
1242 if (lhs
->type
->vector_elements
!= rhs_col
->type
->vector_elements
) {
1243 rhs
= new(ctx
) ir_swizzle(rhs_col
, swiz
, last_row
);
1248 ir_instruction
*inst
=
1249 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, write_mask
);
1250 instructions
->push_tail(inst
);
1253 const unsigned cols
= type
->matrix_columns
;
1254 const unsigned rows
= type
->vector_elements
;
1255 unsigned col_idx
= 0;
1256 unsigned row_idx
= 0;
1258 foreach_list (node
, parameters
) {
1259 ir_rvalue
*const rhs
= (ir_rvalue
*) node
;
1260 const unsigned components_remaining_this_column
= rows
- row_idx
;
1261 unsigned rhs_components
= rhs
->type
->components();
1262 unsigned rhs_base
= 0;
1264 /* Since the parameter might be used in the RHS of two assignments,
1265 * generate a temporary and copy the paramter there.
1267 ir_variable
*rhs_var
=
1268 new(ctx
) ir_variable(rhs
->type
, "mat_ctor_vec", ir_var_temporary
);
1269 instructions
->push_tail(rhs_var
);
1271 ir_dereference
*rhs_var_ref
=
1272 new(ctx
) ir_dereference_variable(rhs_var
);
1273 ir_instruction
*inst
= new(ctx
) ir_assignment(rhs_var_ref
, rhs
, NULL
);
1274 instructions
->push_tail(inst
);
1276 /* Assign the current parameter to as many components of the matrix
1279 * NOTE: A single vector parameter can span two matrix columns. A
1280 * single vec4, for example, can completely fill a mat2.
1282 if (rhs_components
>= components_remaining_this_column
) {
1283 const unsigned count
= MIN2(rhs_components
,
1284 components_remaining_this_column
);
1286 rhs_var_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1288 ir_instruction
*inst
= assign_to_matrix_column(var
, col_idx
,
1292 instructions
->push_tail(inst
);
1300 /* If there is data left in the parameter and components left to be
1301 * set in the destination, emit another assignment. It is possible
1302 * that the assignment could be of a vec4 to the last element of the
1303 * matrix. In this case col_idx==cols, but there is still data
1304 * left in the source parameter. Obviously, don't emit an assignment
1305 * to data outside the destination matrix.
1307 if ((col_idx
< cols
) && (rhs_base
< rhs_components
)) {
1308 const unsigned count
= rhs_components
- rhs_base
;
1310 rhs_var_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1312 ir_instruction
*inst
= assign_to_matrix_column(var
, col_idx
,
1317 instructions
->push_tail(inst
);
1324 return new(ctx
) ir_dereference_variable(var
);
1329 emit_inline_record_constructor(const glsl_type
*type
,
1330 exec_list
*instructions
,
1331 exec_list
*parameters
,
1334 ir_variable
*const var
=
1335 new(mem_ctx
) ir_variable(type
, "record_ctor", ir_var_temporary
);
1336 ir_dereference_variable
*const d
= new(mem_ctx
) ir_dereference_variable(var
);
1338 instructions
->push_tail(var
);
1340 exec_node
*node
= parameters
->head
;
1341 for (unsigned i
= 0; i
< type
->length
; i
++) {
1342 assert(!node
->is_tail_sentinel());
1344 ir_dereference
*const lhs
=
1345 new(mem_ctx
) ir_dereference_record(d
->clone(mem_ctx
, NULL
),
1346 type
->fields
.structure
[i
].name
);
1348 ir_rvalue
*const rhs
= ((ir_instruction
*) node
)->as_rvalue();
1349 assert(rhs
!= NULL
);
1351 ir_instruction
*const assign
= new(mem_ctx
) ir_assignment(lhs
, rhs
, NULL
);
1353 instructions
->push_tail(assign
);
1362 process_record_constructor(exec_list
*instructions
,
1363 const glsl_type
*constructor_type
,
1364 YYLTYPE
*loc
, exec_list
*parameters
,
1365 struct _mesa_glsl_parse_state
*state
)
1368 exec_list actual_parameters
;
1370 process_parameters(instructions
, &actual_parameters
,
1373 exec_node
*node
= actual_parameters
.head
;
1374 for (unsigned i
= 0; i
< constructor_type
->length
; i
++) {
1375 ir_rvalue
*ir
= (ir_rvalue
*) node
;
1377 if (node
->is_tail_sentinel()) {
1378 _mesa_glsl_error(loc
, state
,
1379 "insufficient parameters to constructor for `%s'",
1380 constructor_type
->name
);
1381 return ir_rvalue::error_value(ctx
);
1384 if (apply_implicit_conversion(constructor_type
->fields
.structure
[i
].type
,
1386 node
->replace_with(ir
);
1388 _mesa_glsl_error(loc
, state
,
1389 "parameter type mismatch in constructor for `%s.%s' "
1391 constructor_type
->name
,
1392 constructor_type
->fields
.structure
[i
].name
,
1394 constructor_type
->fields
.structure
[i
].type
->name
);
1395 return ir_rvalue::error_value(ctx
);;
1401 if (!node
->is_tail_sentinel()) {
1402 _mesa_glsl_error(loc
, state
, "too many parameters in constructor "
1403 "for `%s'", constructor_type
->name
);
1404 return ir_rvalue::error_value(ctx
);
1407 ir_rvalue
*const constant
=
1408 constant_record_constructor(constructor_type
, &actual_parameters
,
1411 return (constant
!= NULL
)
1413 : emit_inline_record_constructor(constructor_type
, instructions
,
1414 &actual_parameters
, state
);
1419 ast_function_expression::hir(exec_list
*instructions
,
1420 struct _mesa_glsl_parse_state
*state
)
1423 /* There are three sorts of function calls.
1425 * 1. constructors - The first subexpression is an ast_type_specifier.
1426 * 2. methods - Only the .length() method of array types.
1427 * 3. functions - Calls to regular old functions.
1429 * Method calls are actually detected when the ast_field_selection
1430 * expression is handled.
1432 if (is_constructor()) {
1433 const ast_type_specifier
*type
= (ast_type_specifier
*) subexpressions
[0];
1434 YYLTYPE loc
= type
->get_location();
1437 const glsl_type
*const constructor_type
= type
->glsl_type(& name
, state
);
1439 /* constructor_type can be NULL if a variable with the same name as the
1440 * structure has come into scope.
1442 if (constructor_type
== NULL
) {
1443 _mesa_glsl_error(& loc
, state
, "unknown type `%s' (structure name "
1444 "may be shadowed by a variable with the same name)",
1446 return ir_rvalue::error_value(ctx
);
1450 /* Constructors for samplers are illegal.
1452 if (constructor_type
->is_sampler()) {
1453 _mesa_glsl_error(& loc
, state
, "cannot construct sampler type `%s'",
1454 constructor_type
->name
);
1455 return ir_rvalue::error_value(ctx
);
1458 if (constructor_type
->is_array()) {
1459 if (!state
->check_version(120, 300, &loc
,
1460 "array constructors forbidden")) {
1461 return ir_rvalue::error_value(ctx
);
1464 return process_array_constructor(instructions
, constructor_type
,
1465 & loc
, &this->expressions
, state
);
1469 /* There are two kinds of constructor calls. Constructors for arrays and
1470 * structures must have the exact number of arguments with matching types
1471 * in the correct order. These constructors follow essentially the same
1472 * type matching rules as functions.
1474 * Constructors for built-in language types, such as mat4 and vec2, are
1475 * free form. The only requirements are that the parameters must provide
1476 * enough values of the correct scalar type and that no arguments are
1477 * given past the last used argument.
1479 * When using the C-style initializer syntax from GLSL 4.20, constructors
1480 * must have the exact number of arguments with matching types in the
1483 if (constructor_type
->is_record()) {
1484 return process_record_constructor(instructions
, constructor_type
,
1485 &loc
, &this->expressions
,
1489 if (!constructor_type
->is_numeric() && !constructor_type
->is_boolean())
1490 return ir_rvalue::error_value(ctx
);
1492 /* Total number of components of the type being constructed. */
1493 const unsigned type_components
= constructor_type
->components();
1495 /* Number of components from parameters that have actually been
1496 * consumed. This is used to perform several kinds of error checking.
1498 unsigned components_used
= 0;
1500 unsigned matrix_parameters
= 0;
1501 unsigned nonmatrix_parameters
= 0;
1502 exec_list actual_parameters
;
1504 foreach_list (n
, &this->expressions
) {
1505 ast_node
*ast
= exec_node_data(ast_node
, n
, link
);
1506 ir_rvalue
*result
= ast
->hir(instructions
, state
)->as_rvalue();
1508 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
1510 * "It is an error to provide extra arguments beyond this
1511 * last used argument."
1513 if (components_used
>= type_components
) {
1514 _mesa_glsl_error(& loc
, state
, "too many parameters to `%s' "
1516 constructor_type
->name
);
1517 return ir_rvalue::error_value(ctx
);
1520 if (!result
->type
->is_numeric() && !result
->type
->is_boolean()) {
1521 _mesa_glsl_error(& loc
, state
, "cannot construct `%s' from a "
1522 "non-numeric data type",
1523 constructor_type
->name
);
1524 return ir_rvalue::error_value(ctx
);
1527 /* Count the number of matrix and nonmatrix parameters. This
1528 * is used below to enforce some of the constructor rules.
1530 if (result
->type
->is_matrix())
1531 matrix_parameters
++;
1533 nonmatrix_parameters
++;
1535 actual_parameters
.push_tail(result
);
1536 components_used
+= result
->type
->components();
1539 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
1541 * "It is an error to construct matrices from other matrices. This
1542 * is reserved for future use."
1544 if (matrix_parameters
> 0
1545 && constructor_type
->is_matrix()
1546 && !state
->check_version(120, 100, &loc
,
1547 "cannot construct `%s' from a matrix",
1548 constructor_type
->name
)) {
1549 return ir_rvalue::error_value(ctx
);
1552 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
1554 * "If a matrix argument is given to a matrix constructor, it is
1555 * an error to have any other arguments."
1557 if ((matrix_parameters
> 0)
1558 && ((matrix_parameters
+ nonmatrix_parameters
) > 1)
1559 && constructor_type
->is_matrix()) {
1560 _mesa_glsl_error(& loc
, state
, "for matrix `%s' constructor, "
1561 "matrix must be only parameter",
1562 constructor_type
->name
);
1563 return ir_rvalue::error_value(ctx
);
1566 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
1568 * "In these cases, there must be enough components provided in the
1569 * arguments to provide an initializer for every component in the
1570 * constructed value."
1572 if (components_used
< type_components
&& components_used
!= 1
1573 && matrix_parameters
== 0) {
1574 _mesa_glsl_error(& loc
, state
, "too few components to construct "
1576 constructor_type
->name
);
1577 return ir_rvalue::error_value(ctx
);
1580 /* Later, we cast each parameter to the same base type as the
1581 * constructor. Since there are no non-floating point matrices, we
1582 * need to break them up into a series of column vectors.
1584 if (constructor_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1585 foreach_list_safe(n
, &actual_parameters
) {
1586 ir_rvalue
*matrix
= (ir_rvalue
*) n
;
1588 if (!matrix
->type
->is_matrix())
1591 /* Create a temporary containing the matrix. */
1592 ir_variable
*var
= new(ctx
) ir_variable(matrix
->type
, "matrix_tmp",
1594 instructions
->push_tail(var
);
1595 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
)
1596 ir_dereference_variable(var
), matrix
, NULL
));
1597 var
->constant_value
= matrix
->constant_expression_value();
1599 /* Replace the matrix with dereferences of its columns. */
1600 for (int i
= 0; i
< matrix
->type
->matrix_columns
; i
++) {
1601 matrix
->insert_before(new (ctx
) ir_dereference_array(var
,
1602 new(ctx
) ir_constant(i
)));
1608 bool all_parameters_are_constant
= true;
1610 /* Type cast each parameter and, if possible, fold constants.*/
1611 foreach_list_safe(n
, &actual_parameters
) {
1612 ir_rvalue
*ir
= (ir_rvalue
*) n
;
1614 const glsl_type
*desired_type
=
1615 glsl_type::get_instance(constructor_type
->base_type
,
1616 ir
->type
->vector_elements
,
1617 ir
->type
->matrix_columns
);
1618 ir_rvalue
*result
= convert_component(ir
, desired_type
);
1620 /* Attempt to convert the parameter to a constant valued expression.
1621 * After doing so, track whether or not all the parameters to the
1622 * constructor are trivially constant valued expressions.
1624 ir_rvalue
*const constant
= result
->constant_expression_value();
1626 if (constant
!= NULL
)
1629 all_parameters_are_constant
= false;
1632 ir
->replace_with(result
);
1636 /* If all of the parameters are trivially constant, create a
1637 * constant representing the complete collection of parameters.
1639 if (all_parameters_are_constant
) {
1640 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
1641 } else if (constructor_type
->is_scalar()) {
1642 return dereference_component((ir_rvalue
*) actual_parameters
.head
,
1644 } else if (constructor_type
->is_vector()) {
1645 return emit_inline_vector_constructor(constructor_type
,
1650 assert(constructor_type
->is_matrix());
1651 return emit_inline_matrix_constructor(constructor_type
,
1657 const ast_expression
*id
= subexpressions
[0];
1658 const char *func_name
= id
->primary_expression
.identifier
;
1659 YYLTYPE loc
= id
->get_location();
1660 exec_list actual_parameters
;
1662 process_parameters(instructions
, &actual_parameters
, &this->expressions
,
1665 ir_function_signature
*sig
=
1666 match_function_by_name(func_name
, &actual_parameters
, state
);
1668 ir_rvalue
*value
= NULL
;
1670 no_matching_function_error(func_name
, &loc
, &actual_parameters
, state
);
1671 value
= ir_rvalue::error_value(ctx
);
1672 } else if (!verify_parameter_modes(state
, sig
, actual_parameters
, this->expressions
)) {
1673 /* an error has already been emitted */
1674 value
= ir_rvalue::error_value(ctx
);
1676 value
= generate_call(instructions
, sig
, &actual_parameters
, state
);
1682 return ir_rvalue::error_value(ctx
);
1686 ast_aggregate_initializer::hir(exec_list
*instructions
,
1687 struct _mesa_glsl_parse_state
*state
)
1690 YYLTYPE loc
= this->get_location();
1693 if (!this->constructor_type
) {
1694 _mesa_glsl_error(&loc
, state
, "type of C-style initializer unknown");
1695 return ir_rvalue::error_value(ctx
);
1697 const glsl_type
*const constructor_type
=
1698 this->constructor_type
->glsl_type(&name
, state
);
1700 if (!state
->ARB_shading_language_420pack_enable
) {
1701 _mesa_glsl_error(&loc
, state
, "C-style initialization requires the "
1702 "GL_ARB_shading_language_420pack extension");
1703 return ir_rvalue::error_value(ctx
);
1706 if (this->constructor_type
->is_array
) {
1707 return process_array_constructor(instructions
, constructor_type
, &loc
,
1708 &this->expressions
, state
);
1711 if (this->constructor_type
->structure
) {
1712 return process_record_constructor(instructions
, constructor_type
, &loc
,
1713 &this->expressions
, state
);
1716 return process_vec_mat_constructor(instructions
, constructor_type
, &loc
,
1717 &this->expressions
, state
);