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
->data
.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
->data
.mode
== ir_var_function_out
136 || formal
->data
.mode
== ir_var_function_inout
) {
137 const char *mode
= NULL
;
138 switch (formal
->data
.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
->data
.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 foreach_two_lists(formal_node
, &sig
->parameters
,
297 actual_node
, actual_parameters
) {
298 ir_rvalue
*actual
= (ir_rvalue
*) actual_node
;
299 ir_variable
*formal
= (ir_variable
*) formal_node
;
301 if (formal
->type
->is_numeric() || formal
->type
->is_boolean()) {
302 switch (formal
->data
.mode
) {
303 case ir_var_const_in
:
304 case ir_var_function_in
: {
306 = convert_component(actual
, formal
->type
);
307 actual
->replace_with(converted
);
310 case ir_var_function_out
:
311 case ir_var_function_inout
:
312 fix_parameter(ctx
, actual
, formal
->type
,
313 instructions
, &post_call_conversions
,
314 formal
->data
.mode
== ir_var_function_inout
);
317 assert (!"Illegal formal parameter mode");
323 /* If the function call is a constant expression, don't generate any
324 * instructions; just generate an ir_constant.
326 * Function calls were first allowed to be constant expressions in GLSL
327 * 1.20 and GLSL ES 3.00.
329 if (state
->is_version(120, 300)) {
330 ir_constant
*value
= sig
->constant_expression_value(actual_parameters
, NULL
);
336 ir_dereference_variable
*deref
= NULL
;
337 if (!sig
->return_type
->is_void()) {
338 /* Create a new temporary to hold the return value. */
341 var
= new(ctx
) ir_variable(sig
->return_type
,
342 ralloc_asprintf(ctx
, "%s_retval",
343 sig
->function_name()),
345 instructions
->push_tail(var
);
347 deref
= new(ctx
) ir_dereference_variable(var
);
349 ir_call
*call
= new(ctx
) ir_call(sig
, deref
, actual_parameters
);
350 instructions
->push_tail(call
);
352 /* Also emit any necessary out-parameter conversions. */
353 instructions
->append_list(&post_call_conversions
);
355 return deref
? deref
->clone(ctx
, NULL
) : NULL
;
359 * Given a function name and parameter list, find the matching signature.
361 static ir_function_signature
*
362 match_function_by_name(const char *name
,
363 exec_list
*actual_parameters
,
364 struct _mesa_glsl_parse_state
*state
)
367 ir_function
*f
= state
->symbols
->get_function(name
);
368 ir_function_signature
*local_sig
= NULL
;
369 ir_function_signature
*sig
= NULL
;
371 /* Is the function hidden by a record type constructor? */
372 if (state
->symbols
->get_type(name
))
373 goto done
; /* no match */
375 /* Is the function hidden by a variable (impossible in 1.10)? */
376 if (!state
->symbols
->separate_function_namespace
377 && state
->symbols
->get_variable(name
))
378 goto done
; /* no match */
381 /* Look for a match in the local shader. If exact, we're done. */
382 bool is_exact
= false;
383 sig
= local_sig
= f
->matching_signature(state
, actual_parameters
,
388 if (!state
->es_shader
&& f
->has_user_signature()) {
389 /* In desktop GL, the presence of a user-defined signature hides any
390 * built-in signatures, so we must ignore them. In contrast, in ES2
391 * user-defined signatures add new overloads, so we must proceed.
397 /* Local shader has no exact candidates; check the built-ins. */
398 _mesa_glsl_initialize_builtin_functions();
399 sig
= _mesa_glsl_find_builtin_function(state
, name
, actual_parameters
);
403 /* If the match is from a linked built-in shader, import the prototype. */
404 if (sig
!= local_sig
) {
406 f
= new(ctx
) ir_function(name
);
407 state
->symbols
->add_global_function(f
);
408 emit_function(state
, f
);
410 f
->add_signature(sig
->clone_prototype(f
, NULL
));
417 print_function_prototypes(_mesa_glsl_parse_state
*state
, YYLTYPE
*loc
,
423 foreach_list (node
, &f
->signatures
) {
424 ir_function_signature
*sig
= (ir_function_signature
*) node
;
426 if (sig
->is_builtin() && !sig
->is_builtin_available(state
))
429 char *str
= prototype_string(sig
->return_type
, f
->name
, &sig
->parameters
);
430 _mesa_glsl_error(loc
, state
, " %s", str
);
436 * Raise a "no matching function" error, listing all possible overloads the
437 * compiler considered so developers can figure out what went wrong.
440 no_matching_function_error(const char *name
,
442 exec_list
*actual_parameters
,
443 _mesa_glsl_parse_state
*state
)
445 gl_shader
*sh
= _mesa_glsl_get_builtin_function_shader();
447 if (state
->symbols
->get_function(name
) == NULL
448 && (!state
->uses_builtin_functions
449 || sh
->symbols
->get_function(name
) == NULL
)) {
450 _mesa_glsl_error(loc
, state
, "no function with name '%s'", name
);
452 char *str
= prototype_string(NULL
, name
, actual_parameters
);
453 _mesa_glsl_error(loc
, state
,
454 "no matching function for call to `%s'; candidates are:",
458 print_function_prototypes(state
, loc
, state
->symbols
->get_function(name
));
460 if (state
->uses_builtin_functions
) {
461 print_function_prototypes(state
, loc
, sh
->symbols
->get_function(name
));
467 * Perform automatic type conversion of constructor parameters
469 * This implements the rules in the "Conversion and Scalar Constructors"
470 * section (GLSL 1.10 section 5.4.1), not the "Implicit Conversions" rules.
473 convert_component(ir_rvalue
*src
, const glsl_type
*desired_type
)
475 void *ctx
= ralloc_parent(src
);
476 const unsigned a
= desired_type
->base_type
;
477 const unsigned b
= src
->type
->base_type
;
478 ir_expression
*result
= NULL
;
480 if (src
->type
->is_error())
483 assert(a
<= GLSL_TYPE_BOOL
);
484 assert(b
<= GLSL_TYPE_BOOL
);
493 result
= new(ctx
) ir_expression(ir_unop_i2u
, src
);
495 case GLSL_TYPE_FLOAT
:
496 result
= new(ctx
) ir_expression(ir_unop_f2u
, src
);
499 result
= new(ctx
) ir_expression(ir_unop_i2u
,
500 new(ctx
) ir_expression(ir_unop_b2i
, src
));
507 result
= new(ctx
) ir_expression(ir_unop_u2i
, src
);
509 case GLSL_TYPE_FLOAT
:
510 result
= new(ctx
) ir_expression(ir_unop_f2i
, src
);
513 result
= new(ctx
) ir_expression(ir_unop_b2i
, src
);
517 case GLSL_TYPE_FLOAT
:
520 result
= new(ctx
) ir_expression(ir_unop_u2f
, desired_type
, src
, NULL
);
523 result
= new(ctx
) ir_expression(ir_unop_i2f
, desired_type
, src
, NULL
);
526 result
= new(ctx
) ir_expression(ir_unop_b2f
, desired_type
, src
, NULL
);
533 result
= new(ctx
) ir_expression(ir_unop_i2b
,
534 new(ctx
) ir_expression(ir_unop_u2i
, src
));
537 result
= new(ctx
) ir_expression(ir_unop_i2b
, desired_type
, src
, NULL
);
539 case GLSL_TYPE_FLOAT
:
540 result
= new(ctx
) ir_expression(ir_unop_f2b
, desired_type
, src
, NULL
);
546 assert(result
!= NULL
);
547 assert(result
->type
== desired_type
);
549 /* Try constant folding; it may fold in the conversion we just added. */
550 ir_constant
*const constant
= result
->constant_expression_value();
551 return (constant
!= NULL
) ? (ir_rvalue
*) constant
: (ir_rvalue
*) result
;
555 * Dereference a specific component from a scalar, vector, or matrix
558 dereference_component(ir_rvalue
*src
, unsigned component
)
560 void *ctx
= ralloc_parent(src
);
561 assert(component
< src
->type
->components());
563 /* If the source is a constant, just create a new constant instead of a
564 * dereference of the existing constant.
566 ir_constant
*constant
= src
->as_constant();
568 return new(ctx
) ir_constant(constant
, component
);
570 if (src
->type
->is_scalar()) {
572 } else if (src
->type
->is_vector()) {
573 return new(ctx
) ir_swizzle(src
, component
, 0, 0, 0, 1);
575 assert(src
->type
->is_matrix());
577 /* Dereference a row of the matrix, then call this function again to get
578 * a specific element from that row.
580 const int c
= component
/ src
->type
->column_type()->vector_elements
;
581 const int r
= component
% src
->type
->column_type()->vector_elements
;
582 ir_constant
*const col_index
= new(ctx
) ir_constant(c
);
583 ir_dereference
*const col
= new(ctx
) ir_dereference_array(src
, col_index
);
585 col
->type
= src
->type
->column_type();
587 return dereference_component(col
, r
);
590 assert(!"Should not get here.");
596 process_vec_mat_constructor(exec_list
*instructions
,
597 const glsl_type
*constructor_type
,
598 YYLTYPE
*loc
, exec_list
*parameters
,
599 struct _mesa_glsl_parse_state
*state
)
603 /* The ARB_shading_language_420pack spec says:
605 * "If an initializer is a list of initializers enclosed in curly braces,
606 * the variable being declared must be a vector, a matrix, an array, or a
609 * int i = { 1 }; // illegal, i is not an aggregate"
611 if (constructor_type
->vector_elements
<= 1) {
612 _mesa_glsl_error(loc
, state
, "aggregates can only initialize vectors, "
613 "matrices, arrays, and structs");
614 return ir_rvalue::error_value(ctx
);
617 exec_list actual_parameters
;
618 const unsigned parameter_count
=
619 process_parameters(instructions
, &actual_parameters
, parameters
, state
);
621 if (parameter_count
== 0
622 || (constructor_type
->is_vector() &&
623 constructor_type
->vector_elements
!= parameter_count
)
624 || (constructor_type
->is_matrix() &&
625 constructor_type
->matrix_columns
!= parameter_count
)) {
626 _mesa_glsl_error(loc
, state
, "%s constructor must have %u parameters",
627 constructor_type
->is_vector() ? "vector" : "matrix",
628 constructor_type
->vector_elements
);
629 return ir_rvalue::error_value(ctx
);
632 bool all_parameters_are_constant
= true;
634 /* Type cast each parameter and, if possible, fold constants. */
635 foreach_list_safe(n
, &actual_parameters
) {
636 ir_rvalue
*ir
= (ir_rvalue
*) n
;
637 ir_rvalue
*result
= ir
;
639 /* Apply implicit conversions (not the scalar constructor rules!). See
640 * the spec quote above. */
641 if (constructor_type
->is_float()) {
642 const glsl_type
*desired_type
=
643 glsl_type::get_instance(GLSL_TYPE_FLOAT
,
644 ir
->type
->vector_elements
,
645 ir
->type
->matrix_columns
);
646 if (result
->type
->can_implicitly_convert_to(desired_type
)) {
647 /* Even though convert_component() implements the constructor
648 * conversion rules (not the implicit conversion rules), its safe
649 * to use it here because we already checked that the implicit
650 * conversion is legal.
652 result
= convert_component(ir
, desired_type
);
656 if (constructor_type
->is_matrix()) {
657 if (result
->type
!= constructor_type
->column_type()) {
658 _mesa_glsl_error(loc
, state
, "type error in matrix constructor: "
659 "expected: %s, found %s",
660 constructor_type
->column_type()->name
,
662 return ir_rvalue::error_value(ctx
);
664 } else if (result
->type
!= constructor_type
->get_scalar_type()) {
665 _mesa_glsl_error(loc
, state
, "type error in vector constructor: "
666 "expected: %s, found %s",
667 constructor_type
->get_scalar_type()->name
,
669 return ir_rvalue::error_value(ctx
);
672 /* Attempt to convert the parameter to a constant valued expression.
673 * After doing so, track whether or not all the parameters to the
674 * constructor are trivially constant valued expressions.
676 ir_rvalue
*const constant
= result
->constant_expression_value();
678 if (constant
!= NULL
)
681 all_parameters_are_constant
= false;
683 ir
->replace_with(result
);
686 if (all_parameters_are_constant
)
687 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
689 ir_variable
*var
= new(ctx
) ir_variable(constructor_type
, "vec_mat_ctor",
691 instructions
->push_tail(var
);
694 foreach_list(node
, &actual_parameters
) {
695 ir_rvalue
*rhs
= (ir_rvalue
*) node
;
696 ir_rvalue
*lhs
= new(ctx
) ir_dereference_array(var
,
697 new(ctx
) ir_constant(i
));
699 ir_instruction
*assignment
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
700 instructions
->push_tail(assignment
);
705 return new(ctx
) ir_dereference_variable(var
);
710 process_array_constructor(exec_list
*instructions
,
711 const glsl_type
*constructor_type
,
712 YYLTYPE
*loc
, exec_list
*parameters
,
713 struct _mesa_glsl_parse_state
*state
)
716 /* Array constructors come in two forms: sized and unsized. Sized array
717 * constructors look like 'vec4[2](a, b)', where 'a' and 'b' are vec4
718 * variables. In this case the number of parameters must exactly match the
719 * specified size of the array.
721 * Unsized array constructors look like 'vec4[](a, b)', where 'a' and 'b'
722 * are vec4 variables. In this case the size of the array being constructed
723 * is determined by the number of parameters.
725 * From page 52 (page 58 of the PDF) of the GLSL 1.50 spec:
727 * "There must be exactly the same number of arguments as the size of
728 * the array being constructed. If no size is present in the
729 * constructor, then the array is explicitly sized to the number of
730 * arguments provided. The arguments are assigned in order, starting at
731 * element 0, to the elements of the constructed array. Each argument
732 * must be the same type as the element type of the array, or be a type
733 * that can be converted to the element type of the array according to
734 * Section 4.1.10 "Implicit Conversions.""
736 exec_list actual_parameters
;
737 const unsigned parameter_count
=
738 process_parameters(instructions
, &actual_parameters
, parameters
, state
);
739 bool is_unsized_array
= constructor_type
->is_unsized_array();
741 if ((parameter_count
== 0) ||
742 (!is_unsized_array
&& (constructor_type
->length
!= parameter_count
))) {
743 const unsigned min_param
= is_unsized_array
744 ? 1 : constructor_type
->length
;
746 _mesa_glsl_error(loc
, state
, "array constructor must have %s %u "
748 is_unsized_array
? "at least" : "exactly",
749 min_param
, (min_param
<= 1) ? "" : "s");
750 return ir_rvalue::error_value(ctx
);
753 if (is_unsized_array
) {
755 glsl_type::get_array_instance(constructor_type
->element_type(),
757 assert(constructor_type
!= NULL
);
758 assert(constructor_type
->length
== parameter_count
);
761 bool all_parameters_are_constant
= true;
763 /* Type cast each parameter and, if possible, fold constants. */
764 foreach_list_safe(n
, &actual_parameters
) {
765 ir_rvalue
*ir
= (ir_rvalue
*) n
;
766 ir_rvalue
*result
= ir
;
768 /* Apply implicit conversions (not the scalar constructor rules!). See
769 * the spec quote above. */
770 if (constructor_type
->element_type()->is_float()) {
771 const glsl_type
*desired_type
=
772 glsl_type::get_instance(GLSL_TYPE_FLOAT
,
773 ir
->type
->vector_elements
,
774 ir
->type
->matrix_columns
);
775 if (result
->type
->can_implicitly_convert_to(desired_type
)) {
776 /* Even though convert_component() implements the constructor
777 * conversion rules (not the implicit conversion rules), its safe
778 * to use it here because we already checked that the implicit
779 * conversion is legal.
781 result
= convert_component(ir
, desired_type
);
785 if (result
->type
!= constructor_type
->element_type()) {
786 _mesa_glsl_error(loc
, state
, "type error in array constructor: "
787 "expected: %s, found %s",
788 constructor_type
->element_type()->name
,
790 return ir_rvalue::error_value(ctx
);
793 /* Attempt to convert the parameter to a constant valued expression.
794 * After doing so, track whether or not all the parameters to the
795 * constructor are trivially constant valued expressions.
797 ir_rvalue
*const constant
= result
->constant_expression_value();
799 if (constant
!= NULL
)
802 all_parameters_are_constant
= false;
804 ir
->replace_with(result
);
807 if (all_parameters_are_constant
)
808 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
810 ir_variable
*var
= new(ctx
) ir_variable(constructor_type
, "array_ctor",
812 instructions
->push_tail(var
);
815 foreach_list(node
, &actual_parameters
) {
816 ir_rvalue
*rhs
= (ir_rvalue
*) node
;
817 ir_rvalue
*lhs
= new(ctx
) ir_dereference_array(var
,
818 new(ctx
) ir_constant(i
));
820 ir_instruction
*assignment
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
821 instructions
->push_tail(assignment
);
826 return new(ctx
) ir_dereference_variable(var
);
831 * Try to convert a record constructor to a constant expression
834 constant_record_constructor(const glsl_type
*constructor_type
,
835 exec_list
*parameters
, void *mem_ctx
)
837 foreach_list(node
, parameters
) {
838 ir_constant
*constant
= ((ir_instruction
*) node
)->as_constant();
839 if (constant
== NULL
)
841 node
->replace_with(constant
);
844 return new(mem_ctx
) ir_constant(constructor_type
, parameters
);
849 * Determine if a list consists of a single scalar r-value
852 single_scalar_parameter(exec_list
*parameters
)
854 const ir_rvalue
*const p
= (ir_rvalue
*) parameters
->head
;
855 assert(((ir_rvalue
*)p
)->as_rvalue() != NULL
);
857 return (p
->type
->is_scalar() && p
->next
->is_tail_sentinel());
862 * Generate inline code for a vector constructor
864 * The generated constructor code will consist of a temporary variable
865 * declaration of the same type as the constructor. A sequence of assignments
866 * from constructor parameters to the temporary will follow.
869 * An \c ir_dereference_variable of the temprorary generated in the constructor
873 emit_inline_vector_constructor(const glsl_type
*type
,
874 exec_list
*instructions
,
875 exec_list
*parameters
,
878 assert(!parameters
->is_empty());
880 ir_variable
*var
= new(ctx
) ir_variable(type
, "vec_ctor", ir_var_temporary
);
881 instructions
->push_tail(var
);
883 /* There are two kinds of vector constructors.
885 * - Construct a vector from a single scalar by replicating that scalar to
886 * all components of the vector.
888 * - Construct a vector from an arbirary combination of vectors and
889 * scalars. The components of the constructor parameters are assigned
890 * to the vector in order until the vector is full.
892 const unsigned lhs_components
= type
->components();
893 if (single_scalar_parameter(parameters
)) {
894 ir_rvalue
*first_param
= (ir_rvalue
*)parameters
->head
;
895 ir_rvalue
*rhs
= new(ctx
) ir_swizzle(first_param
, 0, 0, 0, 0,
897 ir_dereference_variable
*lhs
= new(ctx
) ir_dereference_variable(var
);
898 const unsigned mask
= (1U << lhs_components
) - 1;
900 assert(rhs
->type
== lhs
->type
);
902 ir_instruction
*inst
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
, mask
);
903 instructions
->push_tail(inst
);
905 unsigned base_component
= 0;
906 unsigned base_lhs_component
= 0;
907 ir_constant_data data
;
908 unsigned constant_mask
= 0, constant_components
= 0;
910 memset(&data
, 0, sizeof(data
));
912 foreach_list(node
, parameters
) {
913 ir_rvalue
*param
= (ir_rvalue
*) node
;
914 unsigned rhs_components
= param
->type
->components();
916 /* Do not try to assign more components to the vector than it has!
918 if ((rhs_components
+ base_lhs_component
) > lhs_components
) {
919 rhs_components
= lhs_components
- base_lhs_component
;
922 const ir_constant
*const c
= param
->as_constant();
924 for (unsigned i
= 0; i
< rhs_components
; i
++) {
925 switch (c
->type
->base_type
) {
927 data
.u
[i
+ base_component
] = c
->get_uint_component(i
);
930 data
.i
[i
+ base_component
] = c
->get_int_component(i
);
932 case GLSL_TYPE_FLOAT
:
933 data
.f
[i
+ base_component
] = c
->get_float_component(i
);
936 data
.b
[i
+ base_component
] = c
->get_bool_component(i
);
939 assert(!"Should not get here.");
944 /* Mask of fields to be written in the assignment.
946 constant_mask
|= ((1U << rhs_components
) - 1) << base_lhs_component
;
947 constant_components
+= rhs_components
;
949 base_component
+= rhs_components
;
951 /* Advance the component index by the number of components
952 * that were just assigned.
954 base_lhs_component
+= rhs_components
;
957 if (constant_mask
!= 0) {
958 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
959 const glsl_type
*rhs_type
= glsl_type::get_instance(var
->type
->base_type
,
962 ir_rvalue
*rhs
= new(ctx
) ir_constant(rhs_type
, &data
);
964 ir_instruction
*inst
=
965 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, constant_mask
);
966 instructions
->push_tail(inst
);
970 foreach_list(node
, parameters
) {
971 ir_rvalue
*param
= (ir_rvalue
*) node
;
972 unsigned rhs_components
= param
->type
->components();
974 /* Do not try to assign more components to the vector than it has!
976 if ((rhs_components
+ base_component
) > lhs_components
) {
977 rhs_components
= lhs_components
- base_component
;
980 const ir_constant
*const c
= param
->as_constant();
982 /* Mask of fields to be written in the assignment.
984 const unsigned write_mask
= ((1U << rhs_components
) - 1)
987 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
989 /* Generate a swizzle so that LHS and RHS sizes match.
992 new(ctx
) ir_swizzle(param
, 0, 1, 2, 3, rhs_components
);
994 ir_instruction
*inst
=
995 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, write_mask
);
996 instructions
->push_tail(inst
);
999 /* Advance the component index by the number of components that were
1002 base_component
+= rhs_components
;
1005 return new(ctx
) ir_dereference_variable(var
);
1010 * Generate assignment of a portion of a vector to a portion of a matrix column
1012 * \param src_base First component of the source to be used in assignment
1013 * \param column Column of destination to be assiged
1014 * \param row_base First component of the destination column to be assigned
1015 * \param count Number of components to be assigned
1018 * \c src_base + \c count must be less than or equal to the number of components
1019 * in the source vector.
1022 assign_to_matrix_column(ir_variable
*var
, unsigned column
, unsigned row_base
,
1023 ir_rvalue
*src
, unsigned src_base
, unsigned count
,
1026 ir_constant
*col_idx
= new(mem_ctx
) ir_constant(column
);
1027 ir_dereference
*column_ref
= new(mem_ctx
) ir_dereference_array(var
, col_idx
);
1029 assert(column_ref
->type
->components() >= (row_base
+ count
));
1030 assert(src
->type
->components() >= (src_base
+ count
));
1032 /* Generate a swizzle that extracts the number of components from the source
1033 * that are to be assigned to the column of the matrix.
1035 if (count
< src
->type
->vector_elements
) {
1036 src
= new(mem_ctx
) ir_swizzle(src
,
1037 src_base
+ 0, src_base
+ 1,
1038 src_base
+ 2, src_base
+ 3,
1042 /* Mask of fields to be written in the assignment.
1044 const unsigned write_mask
= ((1U << count
) - 1) << row_base
;
1046 return new(mem_ctx
) ir_assignment(column_ref
, src
, NULL
, write_mask
);
1051 * Generate inline code for a matrix constructor
1053 * The generated constructor code will consist of a temporary variable
1054 * declaration of the same type as the constructor. A sequence of assignments
1055 * from constructor parameters to the temporary will follow.
1058 * An \c ir_dereference_variable of the temprorary generated in the constructor
1062 emit_inline_matrix_constructor(const glsl_type
*type
,
1063 exec_list
*instructions
,
1064 exec_list
*parameters
,
1067 assert(!parameters
->is_empty());
1069 ir_variable
*var
= new(ctx
) ir_variable(type
, "mat_ctor", ir_var_temporary
);
1070 instructions
->push_tail(var
);
1072 /* There are three kinds of matrix constructors.
1074 * - Construct a matrix from a single scalar by replicating that scalar to
1075 * along the diagonal of the matrix and setting all other components to
1078 * - Construct a matrix from an arbirary combination of vectors and
1079 * scalars. The components of the constructor parameters are assigned
1080 * to the matrix in colum-major order until the matrix is full.
1082 * - Construct a matrix from a single matrix. The source matrix is copied
1083 * to the upper left portion of the constructed matrix, and the remaining
1084 * elements take values from the identity matrix.
1086 ir_rvalue
*const first_param
= (ir_rvalue
*) parameters
->head
;
1087 if (single_scalar_parameter(parameters
)) {
1088 /* Assign the scalar to the X component of a vec4, and fill the remaining
1089 * components with zero.
1091 ir_variable
*rhs_var
=
1092 new(ctx
) ir_variable(glsl_type::vec4_type
, "mat_ctor_vec",
1094 instructions
->push_tail(rhs_var
);
1096 ir_constant_data zero
;
1102 ir_instruction
*inst
=
1103 new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(rhs_var
),
1104 new(ctx
) ir_constant(rhs_var
->type
, &zero
),
1106 instructions
->push_tail(inst
);
1108 ir_dereference
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1110 inst
= new(ctx
) ir_assignment(rhs_ref
, first_param
, NULL
, 0x01);
1111 instructions
->push_tail(inst
);
1113 /* Assign the temporary vector to each column of the destination matrix
1114 * with a swizzle that puts the X component on the diagonal of the
1115 * matrix. In some cases this may mean that the X component does not
1116 * get assigned into the column at all (i.e., when the matrix has more
1117 * columns than rows).
1119 static const unsigned rhs_swiz
[4][4] = {
1126 const unsigned cols_to_init
= MIN2(type
->matrix_columns
,
1127 type
->vector_elements
);
1128 for (unsigned i
= 0; i
< cols_to_init
; i
++) {
1129 ir_constant
*const col_idx
= new(ctx
) ir_constant(i
);
1130 ir_rvalue
*const col_ref
= new(ctx
) ir_dereference_array(var
, col_idx
);
1132 ir_rvalue
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1133 ir_rvalue
*const rhs
= new(ctx
) ir_swizzle(rhs_ref
, rhs_swiz
[i
],
1134 type
->vector_elements
);
1136 inst
= new(ctx
) ir_assignment(col_ref
, rhs
, NULL
);
1137 instructions
->push_tail(inst
);
1140 for (unsigned i
= cols_to_init
; i
< type
->matrix_columns
; i
++) {
1141 ir_constant
*const col_idx
= new(ctx
) ir_constant(i
);
1142 ir_rvalue
*const col_ref
= new(ctx
) ir_dereference_array(var
, col_idx
);
1144 ir_rvalue
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1145 ir_rvalue
*const rhs
= new(ctx
) ir_swizzle(rhs_ref
, 1, 1, 1, 1,
1146 type
->vector_elements
);
1148 inst
= new(ctx
) ir_assignment(col_ref
, rhs
, NULL
);
1149 instructions
->push_tail(inst
);
1151 } else if (first_param
->type
->is_matrix()) {
1152 /* From page 50 (56 of the PDF) of the GLSL 1.50 spec:
1154 * "If a matrix is constructed from a matrix, then each component
1155 * (column i, row j) in the result that has a corresponding
1156 * component (column i, row j) in the argument will be initialized
1157 * from there. All other components will be initialized to the
1158 * identity matrix. If a matrix argument is given to a matrix
1159 * constructor, it is an error to have any other arguments."
1161 assert(first_param
->next
->is_tail_sentinel());
1162 ir_rvalue
*const src_matrix
= first_param
;
1164 /* If the source matrix is smaller, pre-initialize the relavent parts of
1165 * the destination matrix to the identity matrix.
1167 if ((src_matrix
->type
->matrix_columns
< var
->type
->matrix_columns
)
1168 || (src_matrix
->type
->vector_elements
< var
->type
->vector_elements
)) {
1170 /* If the source matrix has fewer rows, every column of the destination
1171 * must be initialized. Otherwise only the columns in the destination
1172 * that do not exist in the source must be initialized.
1175 (src_matrix
->type
->vector_elements
< var
->type
->vector_elements
)
1176 ? 0 : src_matrix
->type
->matrix_columns
;
1178 const glsl_type
*const col_type
= var
->type
->column_type();
1179 for (/* empty */; col
< var
->type
->matrix_columns
; col
++) {
1180 ir_constant_data ident
;
1189 ir_rvalue
*const rhs
= new(ctx
) ir_constant(col_type
, &ident
);
1191 ir_rvalue
*const lhs
=
1192 new(ctx
) ir_dereference_array(var
, new(ctx
) ir_constant(col
));
1194 ir_instruction
*inst
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
1195 instructions
->push_tail(inst
);
1199 /* Assign columns from the source matrix to the destination matrix.
1201 * Since the parameter will be used in the RHS of multiple assignments,
1202 * generate a temporary and copy the paramter there.
1204 ir_variable
*const rhs_var
=
1205 new(ctx
) ir_variable(first_param
->type
, "mat_ctor_mat",
1207 instructions
->push_tail(rhs_var
);
1209 ir_dereference
*const rhs_var_ref
=
1210 new(ctx
) ir_dereference_variable(rhs_var
);
1211 ir_instruction
*const inst
=
1212 new(ctx
) ir_assignment(rhs_var_ref
, first_param
, NULL
);
1213 instructions
->push_tail(inst
);
1215 const unsigned last_row
= MIN2(src_matrix
->type
->vector_elements
,
1216 var
->type
->vector_elements
);
1217 const unsigned last_col
= MIN2(src_matrix
->type
->matrix_columns
,
1218 var
->type
->matrix_columns
);
1220 unsigned swiz
[4] = { 0, 0, 0, 0 };
1221 for (unsigned i
= 1; i
< last_row
; i
++)
1224 const unsigned write_mask
= (1U << last_row
) - 1;
1226 for (unsigned i
= 0; i
< last_col
; i
++) {
1227 ir_dereference
*const lhs
=
1228 new(ctx
) ir_dereference_array(var
, new(ctx
) ir_constant(i
));
1229 ir_rvalue
*const rhs_col
=
1230 new(ctx
) ir_dereference_array(rhs_var
, new(ctx
) ir_constant(i
));
1232 /* If one matrix has columns that are smaller than the columns of the
1233 * other matrix, wrap the column access of the larger with a swizzle
1234 * so that the LHS and RHS of the assignment have the same size (and
1235 * therefore have the same type).
1237 * It would be perfectly valid to unconditionally generate the
1238 * swizzles, this this will typically result in a more compact IR tree.
1241 if (lhs
->type
->vector_elements
!= rhs_col
->type
->vector_elements
) {
1242 rhs
= new(ctx
) ir_swizzle(rhs_col
, swiz
, last_row
);
1247 ir_instruction
*inst
=
1248 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, write_mask
);
1249 instructions
->push_tail(inst
);
1252 const unsigned cols
= type
->matrix_columns
;
1253 const unsigned rows
= type
->vector_elements
;
1254 unsigned col_idx
= 0;
1255 unsigned row_idx
= 0;
1257 foreach_list (node
, parameters
) {
1258 ir_rvalue
*const rhs
= (ir_rvalue
*) node
;
1259 const unsigned components_remaining_this_column
= rows
- row_idx
;
1260 unsigned rhs_components
= rhs
->type
->components();
1261 unsigned rhs_base
= 0;
1263 /* Since the parameter might be used in the RHS of two assignments,
1264 * generate a temporary and copy the paramter there.
1266 ir_variable
*rhs_var
=
1267 new(ctx
) ir_variable(rhs
->type
, "mat_ctor_vec", ir_var_temporary
);
1268 instructions
->push_tail(rhs_var
);
1270 ir_dereference
*rhs_var_ref
=
1271 new(ctx
) ir_dereference_variable(rhs_var
);
1272 ir_instruction
*inst
= new(ctx
) ir_assignment(rhs_var_ref
, rhs
, NULL
);
1273 instructions
->push_tail(inst
);
1275 /* Assign the current parameter to as many components of the matrix
1278 * NOTE: A single vector parameter can span two matrix columns. A
1279 * single vec4, for example, can completely fill a mat2.
1281 if (rhs_components
>= components_remaining_this_column
) {
1282 const unsigned count
= MIN2(rhs_components
,
1283 components_remaining_this_column
);
1285 rhs_var_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1287 ir_instruction
*inst
= assign_to_matrix_column(var
, col_idx
,
1291 instructions
->push_tail(inst
);
1299 /* If there is data left in the parameter and components left to be
1300 * set in the destination, emit another assignment. It is possible
1301 * that the assignment could be of a vec4 to the last element of the
1302 * matrix. In this case col_idx==cols, but there is still data
1303 * left in the source parameter. Obviously, don't emit an assignment
1304 * to data outside the destination matrix.
1306 if ((col_idx
< cols
) && (rhs_base
< rhs_components
)) {
1307 const unsigned count
= rhs_components
- rhs_base
;
1309 rhs_var_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1311 ir_instruction
*inst
= assign_to_matrix_column(var
, col_idx
,
1316 instructions
->push_tail(inst
);
1323 return new(ctx
) ir_dereference_variable(var
);
1328 emit_inline_record_constructor(const glsl_type
*type
,
1329 exec_list
*instructions
,
1330 exec_list
*parameters
,
1333 ir_variable
*const var
=
1334 new(mem_ctx
) ir_variable(type
, "record_ctor", ir_var_temporary
);
1335 ir_dereference_variable
*const d
= new(mem_ctx
) ir_dereference_variable(var
);
1337 instructions
->push_tail(var
);
1339 exec_node
*node
= parameters
->head
;
1340 for (unsigned i
= 0; i
< type
->length
; i
++) {
1341 assert(!node
->is_tail_sentinel());
1343 ir_dereference
*const lhs
=
1344 new(mem_ctx
) ir_dereference_record(d
->clone(mem_ctx
, NULL
),
1345 type
->fields
.structure
[i
].name
);
1347 ir_rvalue
*const rhs
= ((ir_instruction
*) node
)->as_rvalue();
1348 assert(rhs
!= NULL
);
1350 ir_instruction
*const assign
= new(mem_ctx
) ir_assignment(lhs
, rhs
, NULL
);
1352 instructions
->push_tail(assign
);
1361 process_record_constructor(exec_list
*instructions
,
1362 const glsl_type
*constructor_type
,
1363 YYLTYPE
*loc
, exec_list
*parameters
,
1364 struct _mesa_glsl_parse_state
*state
)
1367 exec_list actual_parameters
;
1369 process_parameters(instructions
, &actual_parameters
,
1372 exec_node
*node
= actual_parameters
.head
;
1373 for (unsigned i
= 0; i
< constructor_type
->length
; i
++) {
1374 ir_rvalue
*ir
= (ir_rvalue
*) node
;
1376 if (node
->is_tail_sentinel()) {
1377 _mesa_glsl_error(loc
, state
,
1378 "insufficient parameters to constructor for `%s'",
1379 constructor_type
->name
);
1380 return ir_rvalue::error_value(ctx
);
1383 if (apply_implicit_conversion(constructor_type
->fields
.structure
[i
].type
,
1385 node
->replace_with(ir
);
1387 _mesa_glsl_error(loc
, state
,
1388 "parameter type mismatch in constructor for `%s.%s' "
1390 constructor_type
->name
,
1391 constructor_type
->fields
.structure
[i
].name
,
1393 constructor_type
->fields
.structure
[i
].type
->name
);
1394 return ir_rvalue::error_value(ctx
);;
1400 if (!node
->is_tail_sentinel()) {
1401 _mesa_glsl_error(loc
, state
, "too many parameters in constructor "
1402 "for `%s'", constructor_type
->name
);
1403 return ir_rvalue::error_value(ctx
);
1406 ir_rvalue
*const constant
=
1407 constant_record_constructor(constructor_type
, &actual_parameters
,
1410 return (constant
!= NULL
)
1412 : emit_inline_record_constructor(constructor_type
, instructions
,
1413 &actual_parameters
, state
);
1418 ast_function_expression::hir(exec_list
*instructions
,
1419 struct _mesa_glsl_parse_state
*state
)
1422 /* There are three sorts of function calls.
1424 * 1. constructors - The first subexpression is an ast_type_specifier.
1425 * 2. methods - Only the .length() method of array types.
1426 * 3. functions - Calls to regular old functions.
1428 * Method calls are actually detected when the ast_field_selection
1429 * expression is handled.
1431 if (is_constructor()) {
1432 const ast_type_specifier
*type
= (ast_type_specifier
*) subexpressions
[0];
1433 YYLTYPE loc
= type
->get_location();
1436 const glsl_type
*const constructor_type
= type
->glsl_type(& name
, state
);
1438 /* constructor_type can be NULL if a variable with the same name as the
1439 * structure has come into scope.
1441 if (constructor_type
== NULL
) {
1442 _mesa_glsl_error(& loc
, state
, "unknown type `%s' (structure name "
1443 "may be shadowed by a variable with the same name)",
1445 return ir_rvalue::error_value(ctx
);
1449 /* Constructors for samplers are illegal.
1451 if (constructor_type
->is_sampler()) {
1452 _mesa_glsl_error(& loc
, state
, "cannot construct sampler type `%s'",
1453 constructor_type
->name
);
1454 return ir_rvalue::error_value(ctx
);
1457 if (constructor_type
->is_array()) {
1458 if (!state
->check_version(120, 300, &loc
,
1459 "array constructors forbidden")) {
1460 return ir_rvalue::error_value(ctx
);
1463 return process_array_constructor(instructions
, constructor_type
,
1464 & loc
, &this->expressions
, state
);
1468 /* There are two kinds of constructor calls. Constructors for arrays and
1469 * structures must have the exact number of arguments with matching types
1470 * in the correct order. These constructors follow essentially the same
1471 * type matching rules as functions.
1473 * Constructors for built-in language types, such as mat4 and vec2, are
1474 * free form. The only requirements are that the parameters must provide
1475 * enough values of the correct scalar type and that no arguments are
1476 * given past the last used argument.
1478 * When using the C-style initializer syntax from GLSL 4.20, constructors
1479 * must have the exact number of arguments with matching types in the
1482 if (constructor_type
->is_record()) {
1483 return process_record_constructor(instructions
, constructor_type
,
1484 &loc
, &this->expressions
,
1488 if (!constructor_type
->is_numeric() && !constructor_type
->is_boolean())
1489 return ir_rvalue::error_value(ctx
);
1491 /* Total number of components of the type being constructed. */
1492 const unsigned type_components
= constructor_type
->components();
1494 /* Number of components from parameters that have actually been
1495 * consumed. This is used to perform several kinds of error checking.
1497 unsigned components_used
= 0;
1499 unsigned matrix_parameters
= 0;
1500 unsigned nonmatrix_parameters
= 0;
1501 exec_list actual_parameters
;
1503 foreach_list (n
, &this->expressions
) {
1504 ast_node
*ast
= exec_node_data(ast_node
, n
, link
);
1505 ir_rvalue
*result
= ast
->hir(instructions
, state
)->as_rvalue();
1507 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
1509 * "It is an error to provide extra arguments beyond this
1510 * last used argument."
1512 if (components_used
>= type_components
) {
1513 _mesa_glsl_error(& loc
, state
, "too many parameters to `%s' "
1515 constructor_type
->name
);
1516 return ir_rvalue::error_value(ctx
);
1519 if (!result
->type
->is_numeric() && !result
->type
->is_boolean()) {
1520 _mesa_glsl_error(& loc
, state
, "cannot construct `%s' from a "
1521 "non-numeric data type",
1522 constructor_type
->name
);
1523 return ir_rvalue::error_value(ctx
);
1526 /* Count the number of matrix and nonmatrix parameters. This
1527 * is used below to enforce some of the constructor rules.
1529 if (result
->type
->is_matrix())
1530 matrix_parameters
++;
1532 nonmatrix_parameters
++;
1534 actual_parameters
.push_tail(result
);
1535 components_used
+= result
->type
->components();
1538 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
1540 * "It is an error to construct matrices from other matrices. This
1541 * is reserved for future use."
1543 if (matrix_parameters
> 0
1544 && constructor_type
->is_matrix()
1545 && !state
->check_version(120, 100, &loc
,
1546 "cannot construct `%s' from a matrix",
1547 constructor_type
->name
)) {
1548 return ir_rvalue::error_value(ctx
);
1551 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
1553 * "If a matrix argument is given to a matrix constructor, it is
1554 * an error to have any other arguments."
1556 if ((matrix_parameters
> 0)
1557 && ((matrix_parameters
+ nonmatrix_parameters
) > 1)
1558 && constructor_type
->is_matrix()) {
1559 _mesa_glsl_error(& loc
, state
, "for matrix `%s' constructor, "
1560 "matrix must be only parameter",
1561 constructor_type
->name
);
1562 return ir_rvalue::error_value(ctx
);
1565 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
1567 * "In these cases, there must be enough components provided in the
1568 * arguments to provide an initializer for every component in the
1569 * constructed value."
1571 if (components_used
< type_components
&& components_used
!= 1
1572 && matrix_parameters
== 0) {
1573 _mesa_glsl_error(& loc
, state
, "too few components to construct "
1575 constructor_type
->name
);
1576 return ir_rvalue::error_value(ctx
);
1579 /* Later, we cast each parameter to the same base type as the
1580 * constructor. Since there are no non-floating point matrices, we
1581 * need to break them up into a series of column vectors.
1583 if (constructor_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1584 foreach_list_safe(n
, &actual_parameters
) {
1585 ir_rvalue
*matrix
= (ir_rvalue
*) n
;
1587 if (!matrix
->type
->is_matrix())
1590 /* Create a temporary containing the matrix. */
1591 ir_variable
*var
= new(ctx
) ir_variable(matrix
->type
, "matrix_tmp",
1593 instructions
->push_tail(var
);
1594 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
)
1595 ir_dereference_variable(var
), matrix
, NULL
));
1596 var
->constant_value
= matrix
->constant_expression_value();
1598 /* Replace the matrix with dereferences of its columns. */
1599 for (int i
= 0; i
< matrix
->type
->matrix_columns
; i
++) {
1600 matrix
->insert_before(new (ctx
) ir_dereference_array(var
,
1601 new(ctx
) ir_constant(i
)));
1607 bool all_parameters_are_constant
= true;
1609 /* Type cast each parameter and, if possible, fold constants.*/
1610 foreach_list_safe(n
, &actual_parameters
) {
1611 ir_rvalue
*ir
= (ir_rvalue
*) n
;
1613 const glsl_type
*desired_type
=
1614 glsl_type::get_instance(constructor_type
->base_type
,
1615 ir
->type
->vector_elements
,
1616 ir
->type
->matrix_columns
);
1617 ir_rvalue
*result
= convert_component(ir
, desired_type
);
1619 /* Attempt to convert the parameter to a constant valued expression.
1620 * After doing so, track whether or not all the parameters to the
1621 * constructor are trivially constant valued expressions.
1623 ir_rvalue
*const constant
= result
->constant_expression_value();
1625 if (constant
!= NULL
)
1628 all_parameters_are_constant
= false;
1631 ir
->replace_with(result
);
1635 /* If all of the parameters are trivially constant, create a
1636 * constant representing the complete collection of parameters.
1638 if (all_parameters_are_constant
) {
1639 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
1640 } else if (constructor_type
->is_scalar()) {
1641 return dereference_component((ir_rvalue
*) actual_parameters
.head
,
1643 } else if (constructor_type
->is_vector()) {
1644 return emit_inline_vector_constructor(constructor_type
,
1649 assert(constructor_type
->is_matrix());
1650 return emit_inline_matrix_constructor(constructor_type
,
1656 const ast_expression
*id
= subexpressions
[0];
1657 const char *func_name
= id
->primary_expression
.identifier
;
1658 YYLTYPE loc
= get_location();
1659 exec_list actual_parameters
;
1661 process_parameters(instructions
, &actual_parameters
, &this->expressions
,
1664 ir_function_signature
*sig
=
1665 match_function_by_name(func_name
, &actual_parameters
, state
);
1667 ir_rvalue
*value
= NULL
;
1669 no_matching_function_error(func_name
, &loc
, &actual_parameters
, state
);
1670 value
= ir_rvalue::error_value(ctx
);
1671 } else if (!verify_parameter_modes(state
, sig
, actual_parameters
, this->expressions
)) {
1672 /* an error has already been emitted */
1673 value
= ir_rvalue::error_value(ctx
);
1675 value
= generate_call(instructions
, sig
, &actual_parameters
, state
);
1681 return ir_rvalue::error_value(ctx
);
1685 ast_aggregate_initializer::hir(exec_list
*instructions
,
1686 struct _mesa_glsl_parse_state
*state
)
1689 YYLTYPE loc
= this->get_location();
1691 if (!this->constructor_type
) {
1692 _mesa_glsl_error(&loc
, state
, "type of C-style initializer unknown");
1693 return ir_rvalue::error_value(ctx
);
1695 const glsl_type
*const constructor_type
= this->constructor_type
;
1697 if (!state
->ARB_shading_language_420pack_enable
) {
1698 _mesa_glsl_error(&loc
, state
, "C-style initialization requires the "
1699 "GL_ARB_shading_language_420pack extension");
1700 return ir_rvalue::error_value(ctx
);
1703 if (constructor_type
->is_array()) {
1704 return process_array_constructor(instructions
, constructor_type
, &loc
,
1705 &this->expressions
, state
);
1708 if (constructor_type
->is_record()) {
1709 return process_record_constructor(instructions
, constructor_type
, &loc
,
1710 &this->expressions
, state
);
1713 return process_vec_mat_constructor(instructions
, constructor_type
, &loc
,
1714 &this->expressions
, state
);