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_image_parameter(YYLTYPE
*loc
, _mesa_glsl_parse_state
*state
,
98 const ir_variable
*formal
, const ir_variable
*actual
)
101 * From the ARB_shader_image_load_store specification:
103 * "The values of image variables qualified with coherent,
104 * volatile, restrict, readonly, or writeonly may not be passed
105 * to functions whose formal parameters lack such
106 * qualifiers. [...] It is legal to have additional qualifiers
107 * on a formal parameter, but not to have fewer."
109 if (actual
->data
.image
.coherent
&& !formal
->data
.image
.coherent
) {
110 _mesa_glsl_error(loc
, state
,
111 "function call parameter `%s' drops "
112 "`coherent' qualifier", formal
->name
);
116 if (actual
->data
.image
._volatile
&& !formal
->data
.image
._volatile
) {
117 _mesa_glsl_error(loc
, state
,
118 "function call parameter `%s' drops "
119 "`volatile' qualifier", formal
->name
);
123 if (actual
->data
.image
.restrict_flag
&& !formal
->data
.image
.restrict_flag
) {
124 _mesa_glsl_error(loc
, state
,
125 "function call parameter `%s' drops "
126 "`restrict' qualifier", formal
->name
);
130 if (actual
->data
.image
.read_only
&& !formal
->data
.image
.read_only
) {
131 _mesa_glsl_error(loc
, state
,
132 "function call parameter `%s' drops "
133 "`readonly' qualifier", formal
->name
);
137 if (actual
->data
.image
.write_only
&& !formal
->data
.image
.write_only
) {
138 _mesa_glsl_error(loc
, state
,
139 "function call parameter `%s' drops "
140 "`writeonly' qualifier", formal
->name
);
148 * Verify that 'out' and 'inout' actual parameters are lvalues. Also, verify
149 * that 'const_in' formal parameters (an extension in our IR) correspond to
150 * ir_constant actual parameters.
153 verify_parameter_modes(_mesa_glsl_parse_state
*state
,
154 ir_function_signature
*sig
,
155 exec_list
&actual_ir_parameters
,
156 exec_list
&actual_ast_parameters
)
158 exec_node
*actual_ir_node
= actual_ir_parameters
.head
;
159 exec_node
*actual_ast_node
= actual_ast_parameters
.head
;
161 foreach_list(formal_node
, &sig
->parameters
) {
162 /* The lists must be the same length. */
163 assert(!actual_ir_node
->is_tail_sentinel());
164 assert(!actual_ast_node
->is_tail_sentinel());
166 const ir_variable
*const formal
= (ir_variable
*) formal_node
;
167 const ir_rvalue
*const actual
= (ir_rvalue
*) actual_ir_node
;
168 const ast_expression
*const actual_ast
=
169 exec_node_data(ast_expression
, actual_ast_node
, link
);
171 /* FIXME: 'loc' is incorrect (as of 2011-01-21). It is always
174 YYLTYPE loc
= actual_ast
->get_location();
176 /* Verify that 'const_in' parameters are ir_constants. */
177 if (formal
->data
.mode
== ir_var_const_in
&&
178 actual
->ir_type
!= ir_type_constant
) {
179 _mesa_glsl_error(&loc
, state
,
180 "parameter `in %s' must be a constant expression",
185 /* Verify that 'out' and 'inout' actual parameters are lvalues. */
186 if (formal
->data
.mode
== ir_var_function_out
187 || formal
->data
.mode
== ir_var_function_inout
) {
188 const char *mode
= NULL
;
189 switch (formal
->data
.mode
) {
190 case ir_var_function_out
: mode
= "out"; break;
191 case ir_var_function_inout
: mode
= "inout"; break;
192 default: assert(false); break;
195 /* This AST-based check catches errors like f(i++). The IR-based
196 * is_lvalue() is insufficient because the actual parameter at the
197 * IR-level is just a temporary value, which is an l-value.
199 if (actual_ast
->non_lvalue_description
!= NULL
) {
200 _mesa_glsl_error(&loc
, state
,
201 "function parameter '%s %s' references a %s",
203 actual_ast
->non_lvalue_description
);
207 ir_variable
*var
= actual
->variable_referenced();
209 var
->data
.assigned
= true;
211 if (var
&& var
->data
.read_only
) {
212 _mesa_glsl_error(&loc
, state
,
213 "function parameter '%s %s' references the "
214 "read-only variable '%s'",
216 actual
->variable_referenced()->name
);
218 } else if (!actual
->is_lvalue()) {
219 /* Even though ir_binop_vector_extract is not an l-value, let it
220 * slop through. generate_call will handle it correctly.
222 ir_expression
*const expr
= ((ir_rvalue
*) actual
)->as_expression();
224 || expr
->operation
!= ir_binop_vector_extract
225 || !expr
->operands
[0]->is_lvalue()) {
226 _mesa_glsl_error(&loc
, state
,
227 "function parameter '%s %s' is not an lvalue",
234 if (formal
->type
->is_image() &&
235 actual
->variable_referenced()) {
236 if (!verify_image_parameter(&loc
, state
, formal
,
237 actual
->variable_referenced()))
241 actual_ir_node
= actual_ir_node
->next
;
242 actual_ast_node
= actual_ast_node
->next
;
248 fix_parameter(void *mem_ctx
, ir_rvalue
*actual
, const glsl_type
*formal_type
,
249 exec_list
*before_instructions
, exec_list
*after_instructions
,
250 bool parameter_is_inout
)
252 ir_expression
*const expr
= actual
->as_expression();
254 /* If the types match exactly and the parameter is not a vector-extract,
255 * nothing needs to be done to fix the parameter.
257 if (formal_type
== actual
->type
258 && (expr
== NULL
|| expr
->operation
!= ir_binop_vector_extract
))
261 /* To convert an out parameter, we need to create a temporary variable to
262 * hold the value before conversion, and then perform the conversion after
263 * the function call returns.
265 * This has the effect of transforming code like this:
271 * Into IR that's equivalent to this:
275 * int out_parameter_conversion;
276 * f(out_parameter_conversion);
277 * value = float(out_parameter_conversion);
279 * If the parameter is an ir_expression of ir_binop_vector_extract,
280 * additional conversion is needed in the post-call re-write.
283 new(mem_ctx
) ir_variable(formal_type
, "inout_tmp", ir_var_temporary
);
285 before_instructions
->push_tail(tmp
);
287 /* If the parameter is an inout parameter, copy the value of the actual
288 * parameter to the new temporary. Note that no type conversion is allowed
289 * here because inout parameters must match types exactly.
291 if (parameter_is_inout
) {
292 /* Inout parameters should never require conversion, since that would
293 * require an implicit conversion to exist both to and from the formal
294 * parameter type, and there are no bidirectional implicit conversions.
296 assert (actual
->type
== formal_type
);
298 ir_dereference_variable
*const deref_tmp_1
=
299 new(mem_ctx
) ir_dereference_variable(tmp
);
300 ir_assignment
*const assignment
=
301 new(mem_ctx
) ir_assignment(deref_tmp_1
, actual
);
302 before_instructions
->push_tail(assignment
);
305 /* Replace the parameter in the call with a dereference of the new
308 ir_dereference_variable
*const deref_tmp_2
=
309 new(mem_ctx
) ir_dereference_variable(tmp
);
310 actual
->replace_with(deref_tmp_2
);
313 /* Copy the temporary variable to the actual parameter with optional
314 * type conversion applied.
316 ir_rvalue
*rhs
= new(mem_ctx
) ir_dereference_variable(tmp
);
317 if (actual
->type
!= formal_type
)
318 rhs
= convert_component(rhs
, actual
->type
);
320 ir_rvalue
*lhs
= actual
;
321 if (expr
!= NULL
&& expr
->operation
== ir_binop_vector_extract
) {
322 rhs
= new(mem_ctx
) ir_expression(ir_triop_vector_insert
,
323 expr
->operands
[0]->type
,
324 expr
->operands
[0]->clone(mem_ctx
, NULL
),
326 expr
->operands
[1]->clone(mem_ctx
, NULL
));
327 lhs
= expr
->operands
[0]->clone(mem_ctx
, NULL
);
330 ir_assignment
*const assignment_2
= new(mem_ctx
) ir_assignment(lhs
, rhs
);
331 after_instructions
->push_tail(assignment_2
);
335 * Generate a function call.
337 * For non-void functions, this returns a dereference of the temporary variable
338 * which stores the return value for the call. For void functions, this returns
342 generate_call(exec_list
*instructions
, ir_function_signature
*sig
,
343 exec_list
*actual_parameters
,
344 struct _mesa_glsl_parse_state
*state
)
347 exec_list post_call_conversions
;
349 /* Perform implicit conversion of arguments. For out parameters, we need
350 * to place them in a temporary variable and do the conversion after the
351 * call takes place. Since we haven't emitted the call yet, we'll place
352 * the post-call conversions in a temporary exec_list, and emit them later.
354 foreach_two_lists(formal_node
, &sig
->parameters
,
355 actual_node
, actual_parameters
) {
356 ir_rvalue
*actual
= (ir_rvalue
*) actual_node
;
357 ir_variable
*formal
= (ir_variable
*) formal_node
;
359 if (formal
->type
->is_numeric() || formal
->type
->is_boolean()) {
360 switch (formal
->data
.mode
) {
361 case ir_var_const_in
:
362 case ir_var_function_in
: {
364 = convert_component(actual
, formal
->type
);
365 actual
->replace_with(converted
);
368 case ir_var_function_out
:
369 case ir_var_function_inout
:
370 fix_parameter(ctx
, actual
, formal
->type
,
371 instructions
, &post_call_conversions
,
372 formal
->data
.mode
== ir_var_function_inout
);
375 assert (!"Illegal formal parameter mode");
381 /* If the function call is a constant expression, don't generate any
382 * instructions; just generate an ir_constant.
384 * Function calls were first allowed to be constant expressions in GLSL
385 * 1.20 and GLSL ES 3.00.
387 if (state
->is_version(120, 300)) {
388 ir_constant
*value
= sig
->constant_expression_value(actual_parameters
, NULL
);
394 ir_dereference_variable
*deref
= NULL
;
395 if (!sig
->return_type
->is_void()) {
396 /* Create a new temporary to hold the return value. */
399 var
= new(ctx
) ir_variable(sig
->return_type
,
400 ralloc_asprintf(ctx
, "%s_retval",
401 sig
->function_name()),
403 instructions
->push_tail(var
);
405 deref
= new(ctx
) ir_dereference_variable(var
);
407 ir_call
*call
= new(ctx
) ir_call(sig
, deref
, actual_parameters
);
408 instructions
->push_tail(call
);
410 /* Also emit any necessary out-parameter conversions. */
411 instructions
->append_list(&post_call_conversions
);
413 return deref
? deref
->clone(ctx
, NULL
) : NULL
;
417 * Given a function name and parameter list, find the matching signature.
419 static ir_function_signature
*
420 match_function_by_name(const char *name
,
421 exec_list
*actual_parameters
,
422 struct _mesa_glsl_parse_state
*state
)
425 ir_function
*f
= state
->symbols
->get_function(name
);
426 ir_function_signature
*local_sig
= NULL
;
427 ir_function_signature
*sig
= NULL
;
429 /* Is the function hidden by a record type constructor? */
430 if (state
->symbols
->get_type(name
))
431 goto done
; /* no match */
433 /* Is the function hidden by a variable (impossible in 1.10)? */
434 if (!state
->symbols
->separate_function_namespace
435 && state
->symbols
->get_variable(name
))
436 goto done
; /* no match */
439 /* Look for a match in the local shader. If exact, we're done. */
440 bool is_exact
= false;
441 sig
= local_sig
= f
->matching_signature(state
, actual_parameters
,
446 if (!state
->es_shader
&& f
->has_user_signature()) {
447 /* In desktop GL, the presence of a user-defined signature hides any
448 * built-in signatures, so we must ignore them. In contrast, in ES2
449 * user-defined signatures add new overloads, so we must proceed.
455 /* Local shader has no exact candidates; check the built-ins. */
456 _mesa_glsl_initialize_builtin_functions();
457 sig
= _mesa_glsl_find_builtin_function(state
, name
, actual_parameters
);
461 /* If the match is from a linked built-in shader, import the prototype. */
462 if (sig
!= local_sig
) {
464 f
= new(ctx
) ir_function(name
);
465 state
->symbols
->add_global_function(f
);
466 emit_function(state
, f
);
468 f
->add_signature(sig
->clone_prototype(f
, NULL
));
475 print_function_prototypes(_mesa_glsl_parse_state
*state
, YYLTYPE
*loc
,
481 foreach_list (node
, &f
->signatures
) {
482 ir_function_signature
*sig
= (ir_function_signature
*) node
;
484 if (sig
->is_builtin() && !sig
->is_builtin_available(state
))
487 char *str
= prototype_string(sig
->return_type
, f
->name
, &sig
->parameters
);
488 _mesa_glsl_error(loc
, state
, " %s", str
);
494 * Raise a "no matching function" error, listing all possible overloads the
495 * compiler considered so developers can figure out what went wrong.
498 no_matching_function_error(const char *name
,
500 exec_list
*actual_parameters
,
501 _mesa_glsl_parse_state
*state
)
503 gl_shader
*sh
= _mesa_glsl_get_builtin_function_shader();
505 if (state
->symbols
->get_function(name
) == NULL
506 && (!state
->uses_builtin_functions
507 || sh
->symbols
->get_function(name
) == NULL
)) {
508 _mesa_glsl_error(loc
, state
, "no function with name '%s'", name
);
510 char *str
= prototype_string(NULL
, name
, actual_parameters
);
511 _mesa_glsl_error(loc
, state
,
512 "no matching function for call to `%s'; candidates are:",
516 print_function_prototypes(state
, loc
, state
->symbols
->get_function(name
));
518 if (state
->uses_builtin_functions
) {
519 print_function_prototypes(state
, loc
, sh
->symbols
->get_function(name
));
525 * Perform automatic type conversion of constructor parameters
527 * This implements the rules in the "Conversion and Scalar Constructors"
528 * section (GLSL 1.10 section 5.4.1), not the "Implicit Conversions" rules.
531 convert_component(ir_rvalue
*src
, const glsl_type
*desired_type
)
533 void *ctx
= ralloc_parent(src
);
534 const unsigned a
= desired_type
->base_type
;
535 const unsigned b
= src
->type
->base_type
;
536 ir_expression
*result
= NULL
;
538 if (src
->type
->is_error())
541 assert(a
<= GLSL_TYPE_BOOL
);
542 assert(b
<= GLSL_TYPE_BOOL
);
551 result
= new(ctx
) ir_expression(ir_unop_i2u
, src
);
553 case GLSL_TYPE_FLOAT
:
554 result
= new(ctx
) ir_expression(ir_unop_f2u
, src
);
557 result
= new(ctx
) ir_expression(ir_unop_i2u
,
558 new(ctx
) ir_expression(ir_unop_b2i
, src
));
565 result
= new(ctx
) ir_expression(ir_unop_u2i
, src
);
567 case GLSL_TYPE_FLOAT
:
568 result
= new(ctx
) ir_expression(ir_unop_f2i
, src
);
571 result
= new(ctx
) ir_expression(ir_unop_b2i
, src
);
575 case GLSL_TYPE_FLOAT
:
578 result
= new(ctx
) ir_expression(ir_unop_u2f
, desired_type
, src
, NULL
);
581 result
= new(ctx
) ir_expression(ir_unop_i2f
, desired_type
, src
, NULL
);
584 result
= new(ctx
) ir_expression(ir_unop_b2f
, desired_type
, src
, NULL
);
591 result
= new(ctx
) ir_expression(ir_unop_i2b
,
592 new(ctx
) ir_expression(ir_unop_u2i
, src
));
595 result
= new(ctx
) ir_expression(ir_unop_i2b
, desired_type
, src
, NULL
);
597 case GLSL_TYPE_FLOAT
:
598 result
= new(ctx
) ir_expression(ir_unop_f2b
, desired_type
, src
, NULL
);
604 assert(result
!= NULL
);
605 assert(result
->type
== desired_type
);
607 /* Try constant folding; it may fold in the conversion we just added. */
608 ir_constant
*const constant
= result
->constant_expression_value();
609 return (constant
!= NULL
) ? (ir_rvalue
*) constant
: (ir_rvalue
*) result
;
613 * Dereference a specific component from a scalar, vector, or matrix
616 dereference_component(ir_rvalue
*src
, unsigned component
)
618 void *ctx
= ralloc_parent(src
);
619 assert(component
< src
->type
->components());
621 /* If the source is a constant, just create a new constant instead of a
622 * dereference of the existing constant.
624 ir_constant
*constant
= src
->as_constant();
626 return new(ctx
) ir_constant(constant
, component
);
628 if (src
->type
->is_scalar()) {
630 } else if (src
->type
->is_vector()) {
631 return new(ctx
) ir_swizzle(src
, component
, 0, 0, 0, 1);
633 assert(src
->type
->is_matrix());
635 /* Dereference a row of the matrix, then call this function again to get
636 * a specific element from that row.
638 const int c
= component
/ src
->type
->column_type()->vector_elements
;
639 const int r
= component
% src
->type
->column_type()->vector_elements
;
640 ir_constant
*const col_index
= new(ctx
) ir_constant(c
);
641 ir_dereference
*const col
= new(ctx
) ir_dereference_array(src
, col_index
);
643 col
->type
= src
->type
->column_type();
645 return dereference_component(col
, r
);
648 assert(!"Should not get here.");
654 process_vec_mat_constructor(exec_list
*instructions
,
655 const glsl_type
*constructor_type
,
656 YYLTYPE
*loc
, exec_list
*parameters
,
657 struct _mesa_glsl_parse_state
*state
)
661 /* The ARB_shading_language_420pack spec says:
663 * "If an initializer is a list of initializers enclosed in curly braces,
664 * the variable being declared must be a vector, a matrix, an array, or a
667 * int i = { 1 }; // illegal, i is not an aggregate"
669 if (constructor_type
->vector_elements
<= 1) {
670 _mesa_glsl_error(loc
, state
, "aggregates can only initialize vectors, "
671 "matrices, arrays, and structs");
672 return ir_rvalue::error_value(ctx
);
675 exec_list actual_parameters
;
676 const unsigned parameter_count
=
677 process_parameters(instructions
, &actual_parameters
, parameters
, state
);
679 if (parameter_count
== 0
680 || (constructor_type
->is_vector() &&
681 constructor_type
->vector_elements
!= parameter_count
)
682 || (constructor_type
->is_matrix() &&
683 constructor_type
->matrix_columns
!= parameter_count
)) {
684 _mesa_glsl_error(loc
, state
, "%s constructor must have %u parameters",
685 constructor_type
->is_vector() ? "vector" : "matrix",
686 constructor_type
->vector_elements
);
687 return ir_rvalue::error_value(ctx
);
690 bool all_parameters_are_constant
= true;
692 /* Type cast each parameter and, if possible, fold constants. */
693 foreach_list_safe(n
, &actual_parameters
) {
694 ir_rvalue
*ir
= (ir_rvalue
*) n
;
695 ir_rvalue
*result
= ir
;
697 /* Apply implicit conversions (not the scalar constructor rules!). See
698 * the spec quote above. */
699 if (constructor_type
->is_float()) {
700 const glsl_type
*desired_type
=
701 glsl_type::get_instance(GLSL_TYPE_FLOAT
,
702 ir
->type
->vector_elements
,
703 ir
->type
->matrix_columns
);
704 if (result
->type
->can_implicitly_convert_to(desired_type
, state
)) {
705 /* Even though convert_component() implements the constructor
706 * conversion rules (not the implicit conversion rules), its safe
707 * to use it here because we already checked that the implicit
708 * conversion is legal.
710 result
= convert_component(ir
, desired_type
);
714 if (constructor_type
->is_matrix()) {
715 if (result
->type
!= constructor_type
->column_type()) {
716 _mesa_glsl_error(loc
, state
, "type error in matrix constructor: "
717 "expected: %s, found %s",
718 constructor_type
->column_type()->name
,
720 return ir_rvalue::error_value(ctx
);
722 } else if (result
->type
!= constructor_type
->get_scalar_type()) {
723 _mesa_glsl_error(loc
, state
, "type error in vector constructor: "
724 "expected: %s, found %s",
725 constructor_type
->get_scalar_type()->name
,
727 return ir_rvalue::error_value(ctx
);
730 /* Attempt to convert the parameter to a constant valued expression.
731 * After doing so, track whether or not all the parameters to the
732 * constructor are trivially constant valued expressions.
734 ir_rvalue
*const constant
= result
->constant_expression_value();
736 if (constant
!= NULL
)
739 all_parameters_are_constant
= false;
741 ir
->replace_with(result
);
744 if (all_parameters_are_constant
)
745 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
747 ir_variable
*var
= new(ctx
) ir_variable(constructor_type
, "vec_mat_ctor",
749 instructions
->push_tail(var
);
752 foreach_list(node
, &actual_parameters
) {
753 ir_rvalue
*rhs
= (ir_rvalue
*) node
;
754 ir_rvalue
*lhs
= new(ctx
) ir_dereference_array(var
,
755 new(ctx
) ir_constant(i
));
757 ir_instruction
*assignment
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
758 instructions
->push_tail(assignment
);
763 return new(ctx
) ir_dereference_variable(var
);
768 process_array_constructor(exec_list
*instructions
,
769 const glsl_type
*constructor_type
,
770 YYLTYPE
*loc
, exec_list
*parameters
,
771 struct _mesa_glsl_parse_state
*state
)
774 /* Array constructors come in two forms: sized and unsized. Sized array
775 * constructors look like 'vec4[2](a, b)', where 'a' and 'b' are vec4
776 * variables. In this case the number of parameters must exactly match the
777 * specified size of the array.
779 * Unsized array constructors look like 'vec4[](a, b)', where 'a' and 'b'
780 * are vec4 variables. In this case the size of the array being constructed
781 * is determined by the number of parameters.
783 * From page 52 (page 58 of the PDF) of the GLSL 1.50 spec:
785 * "There must be exactly the same number of arguments as the size of
786 * the array being constructed. If no size is present in the
787 * constructor, then the array is explicitly sized to the number of
788 * arguments provided. The arguments are assigned in order, starting at
789 * element 0, to the elements of the constructed array. Each argument
790 * must be the same type as the element type of the array, or be a type
791 * that can be converted to the element type of the array according to
792 * Section 4.1.10 "Implicit Conversions.""
794 exec_list actual_parameters
;
795 const unsigned parameter_count
=
796 process_parameters(instructions
, &actual_parameters
, parameters
, state
);
797 bool is_unsized_array
= constructor_type
->is_unsized_array();
799 if ((parameter_count
== 0) ||
800 (!is_unsized_array
&& (constructor_type
->length
!= parameter_count
))) {
801 const unsigned min_param
= is_unsized_array
802 ? 1 : constructor_type
->length
;
804 _mesa_glsl_error(loc
, state
, "array constructor must have %s %u "
806 is_unsized_array
? "at least" : "exactly",
807 min_param
, (min_param
<= 1) ? "" : "s");
808 return ir_rvalue::error_value(ctx
);
811 if (is_unsized_array
) {
813 glsl_type::get_array_instance(constructor_type
->element_type(),
815 assert(constructor_type
!= NULL
);
816 assert(constructor_type
->length
== parameter_count
);
819 bool all_parameters_are_constant
= true;
821 /* Type cast each parameter and, if possible, fold constants. */
822 foreach_list_safe(n
, &actual_parameters
) {
823 ir_rvalue
*ir
= (ir_rvalue
*) n
;
824 ir_rvalue
*result
= ir
;
826 /* Apply implicit conversions (not the scalar constructor rules!). See
827 * the spec quote above. */
828 if (constructor_type
->element_type()->is_float()) {
829 const glsl_type
*desired_type
=
830 glsl_type::get_instance(GLSL_TYPE_FLOAT
,
831 ir
->type
->vector_elements
,
832 ir
->type
->matrix_columns
);
833 if (result
->type
->can_implicitly_convert_to(desired_type
, state
)) {
834 /* Even though convert_component() implements the constructor
835 * conversion rules (not the implicit conversion rules), its safe
836 * to use it here because we already checked that the implicit
837 * conversion is legal.
839 result
= convert_component(ir
, desired_type
);
843 if (result
->type
!= constructor_type
->element_type()) {
844 _mesa_glsl_error(loc
, state
, "type error in array constructor: "
845 "expected: %s, found %s",
846 constructor_type
->element_type()->name
,
848 return ir_rvalue::error_value(ctx
);
851 /* Attempt to convert the parameter to a constant valued expression.
852 * After doing so, track whether or not all the parameters to the
853 * constructor are trivially constant valued expressions.
855 ir_rvalue
*const constant
= result
->constant_expression_value();
857 if (constant
!= NULL
)
860 all_parameters_are_constant
= false;
862 ir
->replace_with(result
);
865 if (all_parameters_are_constant
)
866 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
868 ir_variable
*var
= new(ctx
) ir_variable(constructor_type
, "array_ctor",
870 instructions
->push_tail(var
);
873 foreach_list(node
, &actual_parameters
) {
874 ir_rvalue
*rhs
= (ir_rvalue
*) node
;
875 ir_rvalue
*lhs
= new(ctx
) ir_dereference_array(var
,
876 new(ctx
) ir_constant(i
));
878 ir_instruction
*assignment
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
879 instructions
->push_tail(assignment
);
884 return new(ctx
) ir_dereference_variable(var
);
889 * Try to convert a record constructor to a constant expression
892 constant_record_constructor(const glsl_type
*constructor_type
,
893 exec_list
*parameters
, void *mem_ctx
)
895 foreach_list(node
, parameters
) {
896 ir_constant
*constant
= ((ir_instruction
*) node
)->as_constant();
897 if (constant
== NULL
)
899 node
->replace_with(constant
);
902 return new(mem_ctx
) ir_constant(constructor_type
, parameters
);
907 * Determine if a list consists of a single scalar r-value
910 single_scalar_parameter(exec_list
*parameters
)
912 const ir_rvalue
*const p
= (ir_rvalue
*) parameters
->head
;
913 assert(((ir_rvalue
*)p
)->as_rvalue() != NULL
);
915 return (p
->type
->is_scalar() && p
->next
->is_tail_sentinel());
920 * Generate inline code for a vector constructor
922 * The generated constructor code will consist of a temporary variable
923 * declaration of the same type as the constructor. A sequence of assignments
924 * from constructor parameters to the temporary will follow.
927 * An \c ir_dereference_variable of the temprorary generated in the constructor
931 emit_inline_vector_constructor(const glsl_type
*type
,
932 exec_list
*instructions
,
933 exec_list
*parameters
,
936 assert(!parameters
->is_empty());
938 ir_variable
*var
= new(ctx
) ir_variable(type
, "vec_ctor", ir_var_temporary
);
939 instructions
->push_tail(var
);
941 /* There are two kinds of vector constructors.
943 * - Construct a vector from a single scalar by replicating that scalar to
944 * all components of the vector.
946 * - Construct a vector from an arbirary combination of vectors and
947 * scalars. The components of the constructor parameters are assigned
948 * to the vector in order until the vector is full.
950 const unsigned lhs_components
= type
->components();
951 if (single_scalar_parameter(parameters
)) {
952 ir_rvalue
*first_param
= (ir_rvalue
*)parameters
->head
;
953 ir_rvalue
*rhs
= new(ctx
) ir_swizzle(first_param
, 0, 0, 0, 0,
955 ir_dereference_variable
*lhs
= new(ctx
) ir_dereference_variable(var
);
956 const unsigned mask
= (1U << lhs_components
) - 1;
958 assert(rhs
->type
== lhs
->type
);
960 ir_instruction
*inst
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
, mask
);
961 instructions
->push_tail(inst
);
963 unsigned base_component
= 0;
964 unsigned base_lhs_component
= 0;
965 ir_constant_data data
;
966 unsigned constant_mask
= 0, constant_components
= 0;
968 memset(&data
, 0, sizeof(data
));
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_lhs_component
) > lhs_components
) {
977 rhs_components
= lhs_components
- base_lhs_component
;
980 const ir_constant
*const c
= param
->as_constant();
982 for (unsigned i
= 0; i
< rhs_components
; i
++) {
983 switch (c
->type
->base_type
) {
985 data
.u
[i
+ base_component
] = c
->get_uint_component(i
);
988 data
.i
[i
+ base_component
] = c
->get_int_component(i
);
990 case GLSL_TYPE_FLOAT
:
991 data
.f
[i
+ base_component
] = c
->get_float_component(i
);
994 data
.b
[i
+ base_component
] = c
->get_bool_component(i
);
997 assert(!"Should not get here.");
1002 /* Mask of fields to be written in the assignment.
1004 constant_mask
|= ((1U << rhs_components
) - 1) << base_lhs_component
;
1005 constant_components
+= rhs_components
;
1007 base_component
+= rhs_components
;
1009 /* Advance the component index by the number of components
1010 * that were just assigned.
1012 base_lhs_component
+= rhs_components
;
1015 if (constant_mask
!= 0) {
1016 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
1017 const glsl_type
*rhs_type
= glsl_type::get_instance(var
->type
->base_type
,
1018 constant_components
,
1020 ir_rvalue
*rhs
= new(ctx
) ir_constant(rhs_type
, &data
);
1022 ir_instruction
*inst
=
1023 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, constant_mask
);
1024 instructions
->push_tail(inst
);
1028 foreach_list(node
, parameters
) {
1029 ir_rvalue
*param
= (ir_rvalue
*) node
;
1030 unsigned rhs_components
= param
->type
->components();
1032 /* Do not try to assign more components to the vector than it has!
1034 if ((rhs_components
+ base_component
) > lhs_components
) {
1035 rhs_components
= lhs_components
- base_component
;
1038 const ir_constant
*const c
= param
->as_constant();
1040 /* Mask of fields to be written in the assignment.
1042 const unsigned write_mask
= ((1U << rhs_components
) - 1)
1045 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
1047 /* Generate a swizzle so that LHS and RHS sizes match.
1050 new(ctx
) ir_swizzle(param
, 0, 1, 2, 3, rhs_components
);
1052 ir_instruction
*inst
=
1053 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, write_mask
);
1054 instructions
->push_tail(inst
);
1057 /* Advance the component index by the number of components that were
1060 base_component
+= rhs_components
;
1063 return new(ctx
) ir_dereference_variable(var
);
1068 * Generate assignment of a portion of a vector to a portion of a matrix column
1070 * \param src_base First component of the source to be used in assignment
1071 * \param column Column of destination to be assiged
1072 * \param row_base First component of the destination column to be assigned
1073 * \param count Number of components to be assigned
1076 * \c src_base + \c count must be less than or equal to the number of components
1077 * in the source vector.
1080 assign_to_matrix_column(ir_variable
*var
, unsigned column
, unsigned row_base
,
1081 ir_rvalue
*src
, unsigned src_base
, unsigned count
,
1084 ir_constant
*col_idx
= new(mem_ctx
) ir_constant(column
);
1085 ir_dereference
*column_ref
= new(mem_ctx
) ir_dereference_array(var
, col_idx
);
1087 assert(column_ref
->type
->components() >= (row_base
+ count
));
1088 assert(src
->type
->components() >= (src_base
+ count
));
1090 /* Generate a swizzle that extracts the number of components from the source
1091 * that are to be assigned to the column of the matrix.
1093 if (count
< src
->type
->vector_elements
) {
1094 src
= new(mem_ctx
) ir_swizzle(src
,
1095 src_base
+ 0, src_base
+ 1,
1096 src_base
+ 2, src_base
+ 3,
1100 /* Mask of fields to be written in the assignment.
1102 const unsigned write_mask
= ((1U << count
) - 1) << row_base
;
1104 return new(mem_ctx
) ir_assignment(column_ref
, src
, NULL
, write_mask
);
1109 * Generate inline code for a matrix constructor
1111 * The generated constructor code will consist of a temporary variable
1112 * declaration of the same type as the constructor. A sequence of assignments
1113 * from constructor parameters to the temporary will follow.
1116 * An \c ir_dereference_variable of the temprorary generated in the constructor
1120 emit_inline_matrix_constructor(const glsl_type
*type
,
1121 exec_list
*instructions
,
1122 exec_list
*parameters
,
1125 assert(!parameters
->is_empty());
1127 ir_variable
*var
= new(ctx
) ir_variable(type
, "mat_ctor", ir_var_temporary
);
1128 instructions
->push_tail(var
);
1130 /* There are three kinds of matrix constructors.
1132 * - Construct a matrix from a single scalar by replicating that scalar to
1133 * along the diagonal of the matrix and setting all other components to
1136 * - Construct a matrix from an arbirary combination of vectors and
1137 * scalars. The components of the constructor parameters are assigned
1138 * to the matrix in colum-major order until the matrix is full.
1140 * - Construct a matrix from a single matrix. The source matrix is copied
1141 * to the upper left portion of the constructed matrix, and the remaining
1142 * elements take values from the identity matrix.
1144 ir_rvalue
*const first_param
= (ir_rvalue
*) parameters
->head
;
1145 if (single_scalar_parameter(parameters
)) {
1146 /* Assign the scalar to the X component of a vec4, and fill the remaining
1147 * components with zero.
1149 ir_variable
*rhs_var
=
1150 new(ctx
) ir_variable(glsl_type::vec4_type
, "mat_ctor_vec",
1152 instructions
->push_tail(rhs_var
);
1154 ir_constant_data zero
;
1160 ir_instruction
*inst
=
1161 new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(rhs_var
),
1162 new(ctx
) ir_constant(rhs_var
->type
, &zero
),
1164 instructions
->push_tail(inst
);
1166 ir_dereference
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1168 inst
= new(ctx
) ir_assignment(rhs_ref
, first_param
, NULL
, 0x01);
1169 instructions
->push_tail(inst
);
1171 /* Assign the temporary vector to each column of the destination matrix
1172 * with a swizzle that puts the X component on the diagonal of the
1173 * matrix. In some cases this may mean that the X component does not
1174 * get assigned into the column at all (i.e., when the matrix has more
1175 * columns than rows).
1177 static const unsigned rhs_swiz
[4][4] = {
1184 const unsigned cols_to_init
= MIN2(type
->matrix_columns
,
1185 type
->vector_elements
);
1186 for (unsigned i
= 0; i
< cols_to_init
; i
++) {
1187 ir_constant
*const col_idx
= new(ctx
) ir_constant(i
);
1188 ir_rvalue
*const col_ref
= new(ctx
) ir_dereference_array(var
, col_idx
);
1190 ir_rvalue
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1191 ir_rvalue
*const rhs
= new(ctx
) ir_swizzle(rhs_ref
, rhs_swiz
[i
],
1192 type
->vector_elements
);
1194 inst
= new(ctx
) ir_assignment(col_ref
, rhs
, NULL
);
1195 instructions
->push_tail(inst
);
1198 for (unsigned i
= cols_to_init
; i
< type
->matrix_columns
; i
++) {
1199 ir_constant
*const col_idx
= new(ctx
) ir_constant(i
);
1200 ir_rvalue
*const col_ref
= new(ctx
) ir_dereference_array(var
, col_idx
);
1202 ir_rvalue
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1203 ir_rvalue
*const rhs
= new(ctx
) ir_swizzle(rhs_ref
, 1, 1, 1, 1,
1204 type
->vector_elements
);
1206 inst
= new(ctx
) ir_assignment(col_ref
, rhs
, NULL
);
1207 instructions
->push_tail(inst
);
1209 } else if (first_param
->type
->is_matrix()) {
1210 /* From page 50 (56 of the PDF) of the GLSL 1.50 spec:
1212 * "If a matrix is constructed from a matrix, then each component
1213 * (column i, row j) in the result that has a corresponding
1214 * component (column i, row j) in the argument will be initialized
1215 * from there. All other components will be initialized to the
1216 * identity matrix. If a matrix argument is given to a matrix
1217 * constructor, it is an error to have any other arguments."
1219 assert(first_param
->next
->is_tail_sentinel());
1220 ir_rvalue
*const src_matrix
= first_param
;
1222 /* If the source matrix is smaller, pre-initialize the relavent parts of
1223 * the destination matrix to the identity matrix.
1225 if ((src_matrix
->type
->matrix_columns
< var
->type
->matrix_columns
)
1226 || (src_matrix
->type
->vector_elements
< var
->type
->vector_elements
)) {
1228 /* If the source matrix has fewer rows, every column of the destination
1229 * must be initialized. Otherwise only the columns in the destination
1230 * that do not exist in the source must be initialized.
1233 (src_matrix
->type
->vector_elements
< var
->type
->vector_elements
)
1234 ? 0 : src_matrix
->type
->matrix_columns
;
1236 const glsl_type
*const col_type
= var
->type
->column_type();
1237 for (/* empty */; col
< var
->type
->matrix_columns
; col
++) {
1238 ir_constant_data ident
;
1247 ir_rvalue
*const rhs
= new(ctx
) ir_constant(col_type
, &ident
);
1249 ir_rvalue
*const lhs
=
1250 new(ctx
) ir_dereference_array(var
, new(ctx
) ir_constant(col
));
1252 ir_instruction
*inst
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
1253 instructions
->push_tail(inst
);
1257 /* Assign columns from the source matrix to the destination matrix.
1259 * Since the parameter will be used in the RHS of multiple assignments,
1260 * generate a temporary and copy the paramter there.
1262 ir_variable
*const rhs_var
=
1263 new(ctx
) ir_variable(first_param
->type
, "mat_ctor_mat",
1265 instructions
->push_tail(rhs_var
);
1267 ir_dereference
*const rhs_var_ref
=
1268 new(ctx
) ir_dereference_variable(rhs_var
);
1269 ir_instruction
*const inst
=
1270 new(ctx
) ir_assignment(rhs_var_ref
, first_param
, NULL
);
1271 instructions
->push_tail(inst
);
1273 const unsigned last_row
= MIN2(src_matrix
->type
->vector_elements
,
1274 var
->type
->vector_elements
);
1275 const unsigned last_col
= MIN2(src_matrix
->type
->matrix_columns
,
1276 var
->type
->matrix_columns
);
1278 unsigned swiz
[4] = { 0, 0, 0, 0 };
1279 for (unsigned i
= 1; i
< last_row
; i
++)
1282 const unsigned write_mask
= (1U << last_row
) - 1;
1284 for (unsigned i
= 0; i
< last_col
; i
++) {
1285 ir_dereference
*const lhs
=
1286 new(ctx
) ir_dereference_array(var
, new(ctx
) ir_constant(i
));
1287 ir_rvalue
*const rhs_col
=
1288 new(ctx
) ir_dereference_array(rhs_var
, new(ctx
) ir_constant(i
));
1290 /* If one matrix has columns that are smaller than the columns of the
1291 * other matrix, wrap the column access of the larger with a swizzle
1292 * so that the LHS and RHS of the assignment have the same size (and
1293 * therefore have the same type).
1295 * It would be perfectly valid to unconditionally generate the
1296 * swizzles, this this will typically result in a more compact IR tree.
1299 if (lhs
->type
->vector_elements
!= rhs_col
->type
->vector_elements
) {
1300 rhs
= new(ctx
) ir_swizzle(rhs_col
, swiz
, last_row
);
1305 ir_instruction
*inst
=
1306 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, write_mask
);
1307 instructions
->push_tail(inst
);
1310 const unsigned cols
= type
->matrix_columns
;
1311 const unsigned rows
= type
->vector_elements
;
1312 unsigned col_idx
= 0;
1313 unsigned row_idx
= 0;
1315 foreach_list (node
, parameters
) {
1316 ir_rvalue
*const rhs
= (ir_rvalue
*) node
;
1317 const unsigned components_remaining_this_column
= rows
- row_idx
;
1318 unsigned rhs_components
= rhs
->type
->components();
1319 unsigned rhs_base
= 0;
1321 /* Since the parameter might be used in the RHS of two assignments,
1322 * generate a temporary and copy the paramter there.
1324 ir_variable
*rhs_var
=
1325 new(ctx
) ir_variable(rhs
->type
, "mat_ctor_vec", ir_var_temporary
);
1326 instructions
->push_tail(rhs_var
);
1328 ir_dereference
*rhs_var_ref
=
1329 new(ctx
) ir_dereference_variable(rhs_var
);
1330 ir_instruction
*inst
= new(ctx
) ir_assignment(rhs_var_ref
, rhs
, NULL
);
1331 instructions
->push_tail(inst
);
1333 /* Assign the current parameter to as many components of the matrix
1336 * NOTE: A single vector parameter can span two matrix columns. A
1337 * single vec4, for example, can completely fill a mat2.
1339 if (rhs_components
>= components_remaining_this_column
) {
1340 const unsigned count
= MIN2(rhs_components
,
1341 components_remaining_this_column
);
1343 rhs_var_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1345 ir_instruction
*inst
= assign_to_matrix_column(var
, col_idx
,
1349 instructions
->push_tail(inst
);
1357 /* If there is data left in the parameter and components left to be
1358 * set in the destination, emit another assignment. It is possible
1359 * that the assignment could be of a vec4 to the last element of the
1360 * matrix. In this case col_idx==cols, but there is still data
1361 * left in the source parameter. Obviously, don't emit an assignment
1362 * to data outside the destination matrix.
1364 if ((col_idx
< cols
) && (rhs_base
< rhs_components
)) {
1365 const unsigned count
= rhs_components
- rhs_base
;
1367 rhs_var_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1369 ir_instruction
*inst
= assign_to_matrix_column(var
, col_idx
,
1374 instructions
->push_tail(inst
);
1381 return new(ctx
) ir_dereference_variable(var
);
1386 emit_inline_record_constructor(const glsl_type
*type
,
1387 exec_list
*instructions
,
1388 exec_list
*parameters
,
1391 ir_variable
*const var
=
1392 new(mem_ctx
) ir_variable(type
, "record_ctor", ir_var_temporary
);
1393 ir_dereference_variable
*const d
= new(mem_ctx
) ir_dereference_variable(var
);
1395 instructions
->push_tail(var
);
1397 exec_node
*node
= parameters
->head
;
1398 for (unsigned i
= 0; i
< type
->length
; i
++) {
1399 assert(!node
->is_tail_sentinel());
1401 ir_dereference
*const lhs
=
1402 new(mem_ctx
) ir_dereference_record(d
->clone(mem_ctx
, NULL
),
1403 type
->fields
.structure
[i
].name
);
1405 ir_rvalue
*const rhs
= ((ir_instruction
*) node
)->as_rvalue();
1406 assert(rhs
!= NULL
);
1408 ir_instruction
*const assign
= new(mem_ctx
) ir_assignment(lhs
, rhs
, NULL
);
1410 instructions
->push_tail(assign
);
1419 process_record_constructor(exec_list
*instructions
,
1420 const glsl_type
*constructor_type
,
1421 YYLTYPE
*loc
, exec_list
*parameters
,
1422 struct _mesa_glsl_parse_state
*state
)
1425 exec_list actual_parameters
;
1427 process_parameters(instructions
, &actual_parameters
,
1430 exec_node
*node
= actual_parameters
.head
;
1431 for (unsigned i
= 0; i
< constructor_type
->length
; i
++) {
1432 ir_rvalue
*ir
= (ir_rvalue
*) node
;
1434 if (node
->is_tail_sentinel()) {
1435 _mesa_glsl_error(loc
, state
,
1436 "insufficient parameters to constructor for `%s'",
1437 constructor_type
->name
);
1438 return ir_rvalue::error_value(ctx
);
1441 if (apply_implicit_conversion(constructor_type
->fields
.structure
[i
].type
,
1443 node
->replace_with(ir
);
1445 _mesa_glsl_error(loc
, state
,
1446 "parameter type mismatch in constructor for `%s.%s' "
1448 constructor_type
->name
,
1449 constructor_type
->fields
.structure
[i
].name
,
1451 constructor_type
->fields
.structure
[i
].type
->name
);
1452 return ir_rvalue::error_value(ctx
);;
1458 if (!node
->is_tail_sentinel()) {
1459 _mesa_glsl_error(loc
, state
, "too many parameters in constructor "
1460 "for `%s'", constructor_type
->name
);
1461 return ir_rvalue::error_value(ctx
);
1464 ir_rvalue
*const constant
=
1465 constant_record_constructor(constructor_type
, &actual_parameters
,
1468 return (constant
!= NULL
)
1470 : emit_inline_record_constructor(constructor_type
, instructions
,
1471 &actual_parameters
, state
);
1476 ast_function_expression::hir(exec_list
*instructions
,
1477 struct _mesa_glsl_parse_state
*state
)
1480 /* There are three sorts of function calls.
1482 * 1. constructors - The first subexpression is an ast_type_specifier.
1483 * 2. methods - Only the .length() method of array types.
1484 * 3. functions - Calls to regular old functions.
1486 * Method calls are actually detected when the ast_field_selection
1487 * expression is handled.
1489 if (is_constructor()) {
1490 const ast_type_specifier
*type
= (ast_type_specifier
*) subexpressions
[0];
1491 YYLTYPE loc
= type
->get_location();
1494 const glsl_type
*const constructor_type
= type
->glsl_type(& name
, state
);
1496 /* constructor_type can be NULL if a variable with the same name as the
1497 * structure has come into scope.
1499 if (constructor_type
== NULL
) {
1500 _mesa_glsl_error(& loc
, state
, "unknown type `%s' (structure name "
1501 "may be shadowed by a variable with the same name)",
1503 return ir_rvalue::error_value(ctx
);
1507 /* Constructors for samplers are illegal.
1509 if (constructor_type
->is_sampler()) {
1510 _mesa_glsl_error(& loc
, state
, "cannot construct sampler type `%s'",
1511 constructor_type
->name
);
1512 return ir_rvalue::error_value(ctx
);
1515 if (constructor_type
->is_array()) {
1516 if (!state
->check_version(120, 300, &loc
,
1517 "array constructors forbidden")) {
1518 return ir_rvalue::error_value(ctx
);
1521 return process_array_constructor(instructions
, constructor_type
,
1522 & loc
, &this->expressions
, state
);
1526 /* There are two kinds of constructor calls. Constructors for arrays and
1527 * structures must have the exact number of arguments with matching types
1528 * in the correct order. These constructors follow essentially the same
1529 * type matching rules as functions.
1531 * Constructors for built-in language types, such as mat4 and vec2, are
1532 * free form. The only requirements are that the parameters must provide
1533 * enough values of the correct scalar type and that no arguments are
1534 * given past the last used argument.
1536 * When using the C-style initializer syntax from GLSL 4.20, constructors
1537 * must have the exact number of arguments with matching types in the
1540 if (constructor_type
->is_record()) {
1541 return process_record_constructor(instructions
, constructor_type
,
1542 &loc
, &this->expressions
,
1546 if (!constructor_type
->is_numeric() && !constructor_type
->is_boolean())
1547 return ir_rvalue::error_value(ctx
);
1549 /* Total number of components of the type being constructed. */
1550 const unsigned type_components
= constructor_type
->components();
1552 /* Number of components from parameters that have actually been
1553 * consumed. This is used to perform several kinds of error checking.
1555 unsigned components_used
= 0;
1557 unsigned matrix_parameters
= 0;
1558 unsigned nonmatrix_parameters
= 0;
1559 exec_list actual_parameters
;
1561 foreach_list (n
, &this->expressions
) {
1562 ast_node
*ast
= exec_node_data(ast_node
, n
, link
);
1563 ir_rvalue
*result
= ast
->hir(instructions
, state
);
1565 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
1567 * "It is an error to provide extra arguments beyond this
1568 * last used argument."
1570 if (components_used
>= type_components
) {
1571 _mesa_glsl_error(& loc
, state
, "too many parameters to `%s' "
1573 constructor_type
->name
);
1574 return ir_rvalue::error_value(ctx
);
1577 if (!result
->type
->is_numeric() && !result
->type
->is_boolean()) {
1578 _mesa_glsl_error(& loc
, state
, "cannot construct `%s' from a "
1579 "non-numeric data type",
1580 constructor_type
->name
);
1581 return ir_rvalue::error_value(ctx
);
1584 /* Count the number of matrix and nonmatrix parameters. This
1585 * is used below to enforce some of the constructor rules.
1587 if (result
->type
->is_matrix())
1588 matrix_parameters
++;
1590 nonmatrix_parameters
++;
1592 actual_parameters
.push_tail(result
);
1593 components_used
+= result
->type
->components();
1596 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
1598 * "It is an error to construct matrices from other matrices. This
1599 * is reserved for future use."
1601 if (matrix_parameters
> 0
1602 && constructor_type
->is_matrix()
1603 && !state
->check_version(120, 100, &loc
,
1604 "cannot construct `%s' from a matrix",
1605 constructor_type
->name
)) {
1606 return ir_rvalue::error_value(ctx
);
1609 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
1611 * "If a matrix argument is given to a matrix constructor, it is
1612 * an error to have any other arguments."
1614 if ((matrix_parameters
> 0)
1615 && ((matrix_parameters
+ nonmatrix_parameters
) > 1)
1616 && constructor_type
->is_matrix()) {
1617 _mesa_glsl_error(& loc
, state
, "for matrix `%s' constructor, "
1618 "matrix must be only parameter",
1619 constructor_type
->name
);
1620 return ir_rvalue::error_value(ctx
);
1623 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
1625 * "In these cases, there must be enough components provided in the
1626 * arguments to provide an initializer for every component in the
1627 * constructed value."
1629 if (components_used
< type_components
&& components_used
!= 1
1630 && matrix_parameters
== 0) {
1631 _mesa_glsl_error(& loc
, state
, "too few components to construct "
1633 constructor_type
->name
);
1634 return ir_rvalue::error_value(ctx
);
1637 /* Later, we cast each parameter to the same base type as the
1638 * constructor. Since there are no non-floating point matrices, we
1639 * need to break them up into a series of column vectors.
1641 if (constructor_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1642 foreach_list_safe(n
, &actual_parameters
) {
1643 ir_rvalue
*matrix
= (ir_rvalue
*) n
;
1645 if (!matrix
->type
->is_matrix())
1648 /* Create a temporary containing the matrix. */
1649 ir_variable
*var
= new(ctx
) ir_variable(matrix
->type
, "matrix_tmp",
1651 instructions
->push_tail(var
);
1652 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
)
1653 ir_dereference_variable(var
), matrix
, NULL
));
1654 var
->constant_value
= matrix
->constant_expression_value();
1656 /* Replace the matrix with dereferences of its columns. */
1657 for (int i
= 0; i
< matrix
->type
->matrix_columns
; i
++) {
1658 matrix
->insert_before(new (ctx
) ir_dereference_array(var
,
1659 new(ctx
) ir_constant(i
)));
1665 bool all_parameters_are_constant
= true;
1667 /* Type cast each parameter and, if possible, fold constants.*/
1668 foreach_list_safe(n
, &actual_parameters
) {
1669 ir_rvalue
*ir
= (ir_rvalue
*) n
;
1671 const glsl_type
*desired_type
=
1672 glsl_type::get_instance(constructor_type
->base_type
,
1673 ir
->type
->vector_elements
,
1674 ir
->type
->matrix_columns
);
1675 ir_rvalue
*result
= convert_component(ir
, desired_type
);
1677 /* Attempt to convert the parameter to a constant valued expression.
1678 * After doing so, track whether or not all the parameters to the
1679 * constructor are trivially constant valued expressions.
1681 ir_rvalue
*const constant
= result
->constant_expression_value();
1683 if (constant
!= NULL
)
1686 all_parameters_are_constant
= false;
1689 ir
->replace_with(result
);
1693 /* If all of the parameters are trivially constant, create a
1694 * constant representing the complete collection of parameters.
1696 if (all_parameters_are_constant
) {
1697 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
1698 } else if (constructor_type
->is_scalar()) {
1699 return dereference_component((ir_rvalue
*) actual_parameters
.head
,
1701 } else if (constructor_type
->is_vector()) {
1702 return emit_inline_vector_constructor(constructor_type
,
1707 assert(constructor_type
->is_matrix());
1708 return emit_inline_matrix_constructor(constructor_type
,
1714 const ast_expression
*id
= subexpressions
[0];
1715 const char *func_name
= id
->primary_expression
.identifier
;
1716 YYLTYPE loc
= get_location();
1717 exec_list actual_parameters
;
1719 process_parameters(instructions
, &actual_parameters
, &this->expressions
,
1722 ir_function_signature
*sig
=
1723 match_function_by_name(func_name
, &actual_parameters
, state
);
1725 ir_rvalue
*value
= NULL
;
1727 no_matching_function_error(func_name
, &loc
, &actual_parameters
, state
);
1728 value
= ir_rvalue::error_value(ctx
);
1729 } else if (!verify_parameter_modes(state
, sig
, actual_parameters
, this->expressions
)) {
1730 /* an error has already been emitted */
1731 value
= ir_rvalue::error_value(ctx
);
1733 value
= generate_call(instructions
, sig
, &actual_parameters
, state
);
1739 return ir_rvalue::error_value(ctx
);
1743 ast_aggregate_initializer::hir(exec_list
*instructions
,
1744 struct _mesa_glsl_parse_state
*state
)
1747 YYLTYPE loc
= this->get_location();
1749 if (!this->constructor_type
) {
1750 _mesa_glsl_error(&loc
, state
, "type of C-style initializer unknown");
1751 return ir_rvalue::error_value(ctx
);
1753 const glsl_type
*const constructor_type
= this->constructor_type
;
1755 if (!state
->ARB_shading_language_420pack_enable
) {
1756 _mesa_glsl_error(&loc
, state
, "C-style initialization requires the "
1757 "GL_ARB_shading_language_420pack extension");
1758 return ir_rvalue::error_value(ctx
);
1761 if (constructor_type
->is_array()) {
1762 return process_array_constructor(instructions
, constructor_type
, &loc
,
1763 &this->expressions
, state
);
1766 if (constructor_type
->is_record()) {
1767 return process_record_constructor(instructions
, constructor_type
, &loc
,
1768 &this->expressions
, state
);
1771 return process_vec_mat_constructor(instructions
, constructor_type
, &loc
,
1772 &this->expressions
, state
);