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_typed(ast_node
, ast
, link
, parameters
) {
45 ir_rvalue
*result
= ast
->hir(instructions
, state
);
47 ir_constant
*const constant
= result
->constant_expression_value();
51 actual_parameters
->push_tail(result
);
60 * Generate a source prototype for a function signature
62 * \param return_type Return type of the function. May be \c NULL.
63 * \param name Name of the function.
64 * \param parameters List of \c ir_instruction nodes representing the
65 * parameter list for the function. This may be either a
66 * formal (\c ir_variable) or actual (\c ir_rvalue)
67 * parameter list. Only the type is used.
70 * A ralloced string representing the prototype of the function.
73 prototype_string(const glsl_type
*return_type
, const char *name
,
74 exec_list
*parameters
)
78 if (return_type
!= NULL
)
79 str
= ralloc_asprintf(NULL
, "%s ", return_type
->name
);
81 ralloc_asprintf_append(&str
, "%s(", name
);
83 const char *comma
= "";
84 foreach_in_list(const ir_variable
, param
, parameters
) {
85 ralloc_asprintf_append(&str
, "%s%s", comma
, param
->type
->name
);
89 ralloc_strcat(&str
, ")");
94 verify_image_parameter(YYLTYPE
*loc
, _mesa_glsl_parse_state
*state
,
95 const ir_variable
*formal
, const ir_variable
*actual
)
98 * From the ARB_shader_image_load_store specification:
100 * "The values of image variables qualified with coherent,
101 * volatile, restrict, readonly, or writeonly may not be passed
102 * to functions whose formal parameters lack such
103 * qualifiers. [...] It is legal to have additional qualifiers
104 * on a formal parameter, but not to have fewer."
106 if (actual
->data
.image_coherent
&& !formal
->data
.image_coherent
) {
107 _mesa_glsl_error(loc
, state
,
108 "function call parameter `%s' drops "
109 "`coherent' qualifier", formal
->name
);
113 if (actual
->data
.image_volatile
&& !formal
->data
.image_volatile
) {
114 _mesa_glsl_error(loc
, state
,
115 "function call parameter `%s' drops "
116 "`volatile' qualifier", formal
->name
);
120 if (actual
->data
.image_restrict
&& !formal
->data
.image_restrict
) {
121 _mesa_glsl_error(loc
, state
,
122 "function call parameter `%s' drops "
123 "`restrict' qualifier", formal
->name
);
127 if (actual
->data
.image_read_only
&& !formal
->data
.image_read_only
) {
128 _mesa_glsl_error(loc
, state
,
129 "function call parameter `%s' drops "
130 "`readonly' qualifier", formal
->name
);
134 if (actual
->data
.image_write_only
&& !formal
->data
.image_write_only
) {
135 _mesa_glsl_error(loc
, state
,
136 "function call parameter `%s' drops "
137 "`writeonly' qualifier", formal
->name
);
145 * Verify that 'out' and 'inout' actual parameters are lvalues. Also, verify
146 * that 'const_in' formal parameters (an extension in our IR) correspond to
147 * ir_constant actual parameters.
150 verify_parameter_modes(_mesa_glsl_parse_state
*state
,
151 ir_function_signature
*sig
,
152 exec_list
&actual_ir_parameters
,
153 exec_list
&actual_ast_parameters
)
155 exec_node
*actual_ir_node
= actual_ir_parameters
.head
;
156 exec_node
*actual_ast_node
= actual_ast_parameters
.head
;
158 foreach_in_list(const ir_variable
, formal
, &sig
->parameters
) {
159 /* The lists must be the same length. */
160 assert(!actual_ir_node
->is_tail_sentinel());
161 assert(!actual_ast_node
->is_tail_sentinel());
163 const ir_rvalue
*const actual
= (ir_rvalue
*) actual_ir_node
;
164 const ast_expression
*const actual_ast
=
165 exec_node_data(ast_expression
, actual_ast_node
, link
);
167 /* FIXME: 'loc' is incorrect (as of 2011-01-21). It is always
170 YYLTYPE loc
= actual_ast
->get_location();
172 /* Verify that 'const_in' parameters are ir_constants. */
173 if (formal
->data
.mode
== ir_var_const_in
&&
174 actual
->ir_type
!= ir_type_constant
) {
175 _mesa_glsl_error(&loc
, state
,
176 "parameter `in %s' must be a constant expression",
181 /* Verify that shader_in parameters are shader inputs */
182 if (formal
->data
.must_be_shader_input
) {
183 ir_variable
*var
= actual
->variable_referenced();
184 if (var
&& var
->data
.mode
!= ir_var_shader_in
) {
185 _mesa_glsl_error(&loc
, state
,
186 "parameter `%s` must be a shader input",
191 if (actual
->ir_type
== ir_type_swizzle
) {
192 _mesa_glsl_error(&loc
, state
,
193 "parameter `%s` must not be swizzled",
199 /* Verify that 'out' and 'inout' actual parameters are lvalues. */
200 if (formal
->data
.mode
== ir_var_function_out
201 || formal
->data
.mode
== ir_var_function_inout
) {
202 const char *mode
= NULL
;
203 switch (formal
->data
.mode
) {
204 case ir_var_function_out
: mode
= "out"; break;
205 case ir_var_function_inout
: mode
= "inout"; break;
206 default: assert(false); break;
209 /* This AST-based check catches errors like f(i++). The IR-based
210 * is_lvalue() is insufficient because the actual parameter at the
211 * IR-level is just a temporary value, which is an l-value.
213 if (actual_ast
->non_lvalue_description
!= NULL
) {
214 _mesa_glsl_error(&loc
, state
,
215 "function parameter '%s %s' references a %s",
217 actual_ast
->non_lvalue_description
);
221 ir_variable
*var
= actual
->variable_referenced();
223 var
->data
.assigned
= true;
225 if (var
&& var
->data
.read_only
) {
226 _mesa_glsl_error(&loc
, state
,
227 "function parameter '%s %s' references the "
228 "read-only variable '%s'",
230 actual
->variable_referenced()->name
);
232 } else if (!actual
->is_lvalue()) {
233 /* Even though ir_binop_vector_extract is not an l-value, let it
234 * slop through. generate_call will handle it correctly.
236 ir_expression
*const expr
= ((ir_rvalue
*) actual
)->as_expression();
238 || expr
->operation
!= ir_binop_vector_extract
239 || !expr
->operands
[0]->is_lvalue()) {
240 _mesa_glsl_error(&loc
, state
,
241 "function parameter '%s %s' is not an lvalue",
248 if (formal
->type
->is_image() &&
249 actual
->variable_referenced()) {
250 if (!verify_image_parameter(&loc
, state
, formal
,
251 actual
->variable_referenced()))
255 actual_ir_node
= actual_ir_node
->next
;
256 actual_ast_node
= actual_ast_node
->next
;
262 fix_parameter(void *mem_ctx
, ir_rvalue
*actual
, const glsl_type
*formal_type
,
263 exec_list
*before_instructions
, exec_list
*after_instructions
,
264 bool parameter_is_inout
)
266 ir_expression
*const expr
= actual
->as_expression();
268 /* If the types match exactly and the parameter is not a vector-extract,
269 * nothing needs to be done to fix the parameter.
271 if (formal_type
== actual
->type
272 && (expr
== NULL
|| expr
->operation
!= ir_binop_vector_extract
))
275 /* To convert an out parameter, we need to create a temporary variable to
276 * hold the value before conversion, and then perform the conversion after
277 * the function call returns.
279 * This has the effect of transforming code like this:
285 * Into IR that's equivalent to this:
289 * int out_parameter_conversion;
290 * f(out_parameter_conversion);
291 * value = float(out_parameter_conversion);
293 * If the parameter is an ir_expression of ir_binop_vector_extract,
294 * additional conversion is needed in the post-call re-write.
297 new(mem_ctx
) ir_variable(formal_type
, "inout_tmp", ir_var_temporary
);
299 before_instructions
->push_tail(tmp
);
301 /* If the parameter is an inout parameter, copy the value of the actual
302 * parameter to the new temporary. Note that no type conversion is allowed
303 * here because inout parameters must match types exactly.
305 if (parameter_is_inout
) {
306 /* Inout parameters should never require conversion, since that would
307 * require an implicit conversion to exist both to and from the formal
308 * parameter type, and there are no bidirectional implicit conversions.
310 assert (actual
->type
== formal_type
);
312 ir_dereference_variable
*const deref_tmp_1
=
313 new(mem_ctx
) ir_dereference_variable(tmp
);
314 ir_assignment
*const assignment
=
315 new(mem_ctx
) ir_assignment(deref_tmp_1
, actual
);
316 before_instructions
->push_tail(assignment
);
319 /* Replace the parameter in the call with a dereference of the new
322 ir_dereference_variable
*const deref_tmp_2
=
323 new(mem_ctx
) ir_dereference_variable(tmp
);
324 actual
->replace_with(deref_tmp_2
);
327 /* Copy the temporary variable to the actual parameter with optional
328 * type conversion applied.
330 ir_rvalue
*rhs
= new(mem_ctx
) ir_dereference_variable(tmp
);
331 if (actual
->type
!= formal_type
)
332 rhs
= convert_component(rhs
, actual
->type
);
334 ir_rvalue
*lhs
= actual
;
335 if (expr
!= NULL
&& expr
->operation
== ir_binop_vector_extract
) {
336 rhs
= new(mem_ctx
) ir_expression(ir_triop_vector_insert
,
337 expr
->operands
[0]->type
,
338 expr
->operands
[0]->clone(mem_ctx
, NULL
),
340 expr
->operands
[1]->clone(mem_ctx
, NULL
));
341 lhs
= expr
->operands
[0]->clone(mem_ctx
, NULL
);
344 ir_assignment
*const assignment_2
= new(mem_ctx
) ir_assignment(lhs
, rhs
);
345 after_instructions
->push_tail(assignment_2
);
349 * Generate a function call.
351 * For non-void functions, this returns a dereference of the temporary variable
352 * which stores the return value for the call. For void functions, this returns
356 generate_call(exec_list
*instructions
, ir_function_signature
*sig
,
357 exec_list
*actual_parameters
,
358 struct _mesa_glsl_parse_state
*state
)
361 exec_list post_call_conversions
;
363 /* Perform implicit conversion of arguments. For out parameters, we need
364 * to place them in a temporary variable and do the conversion after the
365 * call takes place. Since we haven't emitted the call yet, we'll place
366 * the post-call conversions in a temporary exec_list, and emit them later.
368 foreach_two_lists(formal_node
, &sig
->parameters
,
369 actual_node
, actual_parameters
) {
370 ir_rvalue
*actual
= (ir_rvalue
*) actual_node
;
371 ir_variable
*formal
= (ir_variable
*) formal_node
;
373 if (formal
->type
->is_numeric() || formal
->type
->is_boolean()) {
374 switch (formal
->data
.mode
) {
375 case ir_var_const_in
:
376 case ir_var_function_in
: {
378 = convert_component(actual
, formal
->type
);
379 actual
->replace_with(converted
);
382 case ir_var_function_out
:
383 case ir_var_function_inout
:
384 fix_parameter(ctx
, actual
, formal
->type
,
385 instructions
, &post_call_conversions
,
386 formal
->data
.mode
== ir_var_function_inout
);
389 assert (!"Illegal formal parameter mode");
395 /* If the function call is a constant expression, don't generate any
396 * instructions; just generate an ir_constant.
398 * Function calls were first allowed to be constant expressions in GLSL
399 * 1.20 and GLSL ES 3.00.
401 if (state
->is_version(120, 300)) {
402 ir_constant
*value
= sig
->constant_expression_value(actual_parameters
, NULL
);
408 ir_dereference_variable
*deref
= NULL
;
409 if (!sig
->return_type
->is_void()) {
410 /* Create a new temporary to hold the return value. */
411 char *const name
= ir_variable::temporaries_allocate_names
412 ? ralloc_asprintf(ctx
, "%s_retval", sig
->function_name())
417 var
= new(ctx
) ir_variable(sig
->return_type
, name
, ir_var_temporary
);
418 instructions
->push_tail(var
);
422 deref
= new(ctx
) ir_dereference_variable(var
);
424 ir_call
*call
= new(ctx
) ir_call(sig
, deref
, actual_parameters
);
425 instructions
->push_tail(call
);
427 /* Also emit any necessary out-parameter conversions. */
428 instructions
->append_list(&post_call_conversions
);
430 return deref
? deref
->clone(ctx
, NULL
) : NULL
;
434 * Given a function name and parameter list, find the matching signature.
436 static ir_function_signature
*
437 match_function_by_name(const char *name
,
438 exec_list
*actual_parameters
,
439 struct _mesa_glsl_parse_state
*state
)
442 ir_function
*f
= state
->symbols
->get_function(name
);
443 ir_function_signature
*local_sig
= NULL
;
444 ir_function_signature
*sig
= NULL
;
446 /* Is the function hidden by a record type constructor? */
447 if (state
->symbols
->get_type(name
))
448 goto done
; /* no match */
450 /* Is the function hidden by a variable (impossible in 1.10)? */
451 if (!state
->symbols
->separate_function_namespace
452 && state
->symbols
->get_variable(name
))
453 goto done
; /* no match */
456 /* In desktop GL, the presence of a user-defined signature hides any
457 * built-in signatures, so we must ignore them. In contrast, in ES2
458 * user-defined signatures add new overloads, so we must consider them.
460 bool allow_builtins
= state
->es_shader
|| !f
->has_user_signature();
462 /* Look for a match in the local shader. If exact, we're done. */
463 bool is_exact
= false;
464 sig
= local_sig
= f
->matching_signature(state
, actual_parameters
,
465 allow_builtins
, &is_exact
);
473 /* Local shader has no exact candidates; check the built-ins. */
474 _mesa_glsl_initialize_builtin_functions();
475 sig
= _mesa_glsl_find_builtin_function(state
, name
, actual_parameters
);
479 /* If the match is from a linked built-in shader, import the prototype. */
480 if (sig
!= local_sig
) {
482 f
= new(ctx
) ir_function(name
);
483 state
->symbols
->add_global_function(f
);
484 emit_function(state
, f
);
486 f
->add_signature(sig
->clone_prototype(f
, NULL
));
493 print_function_prototypes(_mesa_glsl_parse_state
*state
, YYLTYPE
*loc
,
499 foreach_in_list(ir_function_signature
, sig
, &f
->signatures
) {
500 if (sig
->is_builtin() && !sig
->is_builtin_available(state
))
503 char *str
= prototype_string(sig
->return_type
, f
->name
, &sig
->parameters
);
504 _mesa_glsl_error(loc
, state
, " %s", str
);
510 * Raise a "no matching function" error, listing all possible overloads the
511 * compiler considered so developers can figure out what went wrong.
514 no_matching_function_error(const char *name
,
516 exec_list
*actual_parameters
,
517 _mesa_glsl_parse_state
*state
)
519 gl_shader
*sh
= _mesa_glsl_get_builtin_function_shader();
521 if (state
->symbols
->get_function(name
) == NULL
522 && (!state
->uses_builtin_functions
523 || sh
->symbols
->get_function(name
) == NULL
)) {
524 _mesa_glsl_error(loc
, state
, "no function with name '%s'", name
);
526 char *str
= prototype_string(NULL
, name
, actual_parameters
);
527 _mesa_glsl_error(loc
, state
,
528 "no matching function for call to `%s'; candidates are:",
532 print_function_prototypes(state
, loc
, state
->symbols
->get_function(name
));
534 if (state
->uses_builtin_functions
) {
535 print_function_prototypes(state
, loc
, sh
->symbols
->get_function(name
));
541 * Perform automatic type conversion of constructor parameters
543 * This implements the rules in the "Conversion and Scalar Constructors"
544 * section (GLSL 1.10 section 5.4.1), not the "Implicit Conversions" rules.
547 convert_component(ir_rvalue
*src
, const glsl_type
*desired_type
)
549 void *ctx
= ralloc_parent(src
);
550 const unsigned a
= desired_type
->base_type
;
551 const unsigned b
= src
->type
->base_type
;
552 ir_expression
*result
= NULL
;
554 if (src
->type
->is_error())
557 assert(a
<= GLSL_TYPE_BOOL
);
558 assert(b
<= GLSL_TYPE_BOOL
);
567 result
= new(ctx
) ir_expression(ir_unop_i2u
, src
);
569 case GLSL_TYPE_FLOAT
:
570 result
= new(ctx
) ir_expression(ir_unop_f2u
, src
);
573 result
= new(ctx
) ir_expression(ir_unop_i2u
,
574 new(ctx
) ir_expression(ir_unop_b2i
, src
));
581 result
= new(ctx
) ir_expression(ir_unop_u2i
, src
);
583 case GLSL_TYPE_FLOAT
:
584 result
= new(ctx
) ir_expression(ir_unop_f2i
, src
);
587 result
= new(ctx
) ir_expression(ir_unop_b2i
, src
);
591 case GLSL_TYPE_FLOAT
:
594 result
= new(ctx
) ir_expression(ir_unop_u2f
, desired_type
, src
, NULL
);
597 result
= new(ctx
) ir_expression(ir_unop_i2f
, desired_type
, src
, NULL
);
600 result
= new(ctx
) ir_expression(ir_unop_b2f
, desired_type
, src
, NULL
);
607 result
= new(ctx
) ir_expression(ir_unop_i2b
,
608 new(ctx
) ir_expression(ir_unop_u2i
, src
));
611 result
= new(ctx
) ir_expression(ir_unop_i2b
, desired_type
, src
, NULL
);
613 case GLSL_TYPE_FLOAT
:
614 result
= new(ctx
) ir_expression(ir_unop_f2b
, desired_type
, src
, NULL
);
620 assert(result
!= NULL
);
621 assert(result
->type
== desired_type
);
623 /* Try constant folding; it may fold in the conversion we just added. */
624 ir_constant
*const constant
= result
->constant_expression_value();
625 return (constant
!= NULL
) ? (ir_rvalue
*) constant
: (ir_rvalue
*) result
;
629 * Dereference a specific component from a scalar, vector, or matrix
632 dereference_component(ir_rvalue
*src
, unsigned component
)
634 void *ctx
= ralloc_parent(src
);
635 assert(component
< src
->type
->components());
637 /* If the source is a constant, just create a new constant instead of a
638 * dereference of the existing constant.
640 ir_constant
*constant
= src
->as_constant();
642 return new(ctx
) ir_constant(constant
, component
);
644 if (src
->type
->is_scalar()) {
646 } else if (src
->type
->is_vector()) {
647 return new(ctx
) ir_swizzle(src
, component
, 0, 0, 0, 1);
649 assert(src
->type
->is_matrix());
651 /* Dereference a row of the matrix, then call this function again to get
652 * a specific element from that row.
654 const int c
= component
/ src
->type
->column_type()->vector_elements
;
655 const int r
= component
% src
->type
->column_type()->vector_elements
;
656 ir_constant
*const col_index
= new(ctx
) ir_constant(c
);
657 ir_dereference
*const col
= new(ctx
) ir_dereference_array(src
, col_index
);
659 col
->type
= src
->type
->column_type();
661 return dereference_component(col
, r
);
664 assert(!"Should not get here.");
670 process_vec_mat_constructor(exec_list
*instructions
,
671 const glsl_type
*constructor_type
,
672 YYLTYPE
*loc
, exec_list
*parameters
,
673 struct _mesa_glsl_parse_state
*state
)
677 /* The ARB_shading_language_420pack spec says:
679 * "If an initializer is a list of initializers enclosed in curly braces,
680 * the variable being declared must be a vector, a matrix, an array, or a
683 * int i = { 1 }; // illegal, i is not an aggregate"
685 if (constructor_type
->vector_elements
<= 1) {
686 _mesa_glsl_error(loc
, state
, "aggregates can only initialize vectors, "
687 "matrices, arrays, and structs");
688 return ir_rvalue::error_value(ctx
);
691 exec_list actual_parameters
;
692 const unsigned parameter_count
=
693 process_parameters(instructions
, &actual_parameters
, parameters
, state
);
695 if (parameter_count
== 0
696 || (constructor_type
->is_vector() &&
697 constructor_type
->vector_elements
!= parameter_count
)
698 || (constructor_type
->is_matrix() &&
699 constructor_type
->matrix_columns
!= parameter_count
)) {
700 _mesa_glsl_error(loc
, state
, "%s constructor must have %u parameters",
701 constructor_type
->is_vector() ? "vector" : "matrix",
702 constructor_type
->vector_elements
);
703 return ir_rvalue::error_value(ctx
);
706 bool all_parameters_are_constant
= true;
708 /* Type cast each parameter and, if possible, fold constants. */
709 foreach_in_list_safe(ir_rvalue
, ir
, &actual_parameters
) {
710 ir_rvalue
*result
= ir
;
712 /* Apply implicit conversions (not the scalar constructor rules!). See
713 * the spec quote above. */
714 if (constructor_type
->is_float()) {
715 const glsl_type
*desired_type
=
716 glsl_type::get_instance(GLSL_TYPE_FLOAT
,
717 ir
->type
->vector_elements
,
718 ir
->type
->matrix_columns
);
719 if (result
->type
->can_implicitly_convert_to(desired_type
, state
)) {
720 /* Even though convert_component() implements the constructor
721 * conversion rules (not the implicit conversion rules), its safe
722 * to use it here because we already checked that the implicit
723 * conversion is legal.
725 result
= convert_component(ir
, desired_type
);
729 if (constructor_type
->is_matrix()) {
730 if (result
->type
!= constructor_type
->column_type()) {
731 _mesa_glsl_error(loc
, state
, "type error in matrix constructor: "
732 "expected: %s, found %s",
733 constructor_type
->column_type()->name
,
735 return ir_rvalue::error_value(ctx
);
737 } else if (result
->type
!= constructor_type
->get_scalar_type()) {
738 _mesa_glsl_error(loc
, state
, "type error in vector constructor: "
739 "expected: %s, found %s",
740 constructor_type
->get_scalar_type()->name
,
742 return ir_rvalue::error_value(ctx
);
745 /* Attempt to convert the parameter to a constant valued expression.
746 * After doing so, track whether or not all the parameters to the
747 * constructor are trivially constant valued expressions.
749 ir_rvalue
*const constant
= result
->constant_expression_value();
751 if (constant
!= NULL
)
754 all_parameters_are_constant
= false;
756 ir
->replace_with(result
);
759 if (all_parameters_are_constant
)
760 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
762 ir_variable
*var
= new(ctx
) ir_variable(constructor_type
, "vec_mat_ctor",
764 instructions
->push_tail(var
);
768 foreach_in_list(ir_rvalue
, rhs
, &actual_parameters
) {
769 ir_instruction
*assignment
= NULL
;
771 if (var
->type
->is_matrix()) {
772 ir_rvalue
*lhs
= new(ctx
) ir_dereference_array(var
,
773 new(ctx
) ir_constant(i
));
774 assignment
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
776 /* use writemask rather than index for vector */
777 assert(var
->type
->is_vector());
779 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
780 assignment
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
, (unsigned)(1 << i
));
783 instructions
->push_tail(assignment
);
788 return new(ctx
) ir_dereference_variable(var
);
793 process_array_constructor(exec_list
*instructions
,
794 const glsl_type
*constructor_type
,
795 YYLTYPE
*loc
, exec_list
*parameters
,
796 struct _mesa_glsl_parse_state
*state
)
799 /* Array constructors come in two forms: sized and unsized. Sized array
800 * constructors look like 'vec4[2](a, b)', where 'a' and 'b' are vec4
801 * variables. In this case the number of parameters must exactly match the
802 * specified size of the array.
804 * Unsized array constructors look like 'vec4[](a, b)', where 'a' and 'b'
805 * are vec4 variables. In this case the size of the array being constructed
806 * is determined by the number of parameters.
808 * From page 52 (page 58 of the PDF) of the GLSL 1.50 spec:
810 * "There must be exactly the same number of arguments as the size of
811 * the array being constructed. If no size is present in the
812 * constructor, then the array is explicitly sized to the number of
813 * arguments provided. The arguments are assigned in order, starting at
814 * element 0, to the elements of the constructed array. Each argument
815 * must be the same type as the element type of the array, or be a type
816 * that can be converted to the element type of the array according to
817 * Section 4.1.10 "Implicit Conversions.""
819 exec_list actual_parameters
;
820 const unsigned parameter_count
=
821 process_parameters(instructions
, &actual_parameters
, parameters
, state
);
822 bool is_unsized_array
= constructor_type
->is_unsized_array();
824 if ((parameter_count
== 0) ||
825 (!is_unsized_array
&& (constructor_type
->length
!= parameter_count
))) {
826 const unsigned min_param
= is_unsized_array
827 ? 1 : constructor_type
->length
;
829 _mesa_glsl_error(loc
, state
, "array constructor must have %s %u "
831 is_unsized_array
? "at least" : "exactly",
832 min_param
, (min_param
<= 1) ? "" : "s");
833 return ir_rvalue::error_value(ctx
);
836 if (is_unsized_array
) {
838 glsl_type::get_array_instance(constructor_type
->element_type(),
840 assert(constructor_type
!= NULL
);
841 assert(constructor_type
->length
== parameter_count
);
844 bool all_parameters_are_constant
= true;
846 /* Type cast each parameter and, if possible, fold constants. */
847 foreach_in_list_safe(ir_rvalue
, ir
, &actual_parameters
) {
848 ir_rvalue
*result
= ir
;
850 /* Apply implicit conversions (not the scalar constructor rules!). See
851 * the spec quote above. */
852 if (constructor_type
->element_type()->is_float()) {
853 const glsl_type
*desired_type
=
854 glsl_type::get_instance(GLSL_TYPE_FLOAT
,
855 ir
->type
->vector_elements
,
856 ir
->type
->matrix_columns
);
857 if (result
->type
->can_implicitly_convert_to(desired_type
, state
)) {
858 /* Even though convert_component() implements the constructor
859 * conversion rules (not the implicit conversion rules), its safe
860 * to use it here because we already checked that the implicit
861 * conversion is legal.
863 result
= convert_component(ir
, desired_type
);
867 if (result
->type
!= constructor_type
->element_type()) {
868 _mesa_glsl_error(loc
, state
, "type error in array constructor: "
869 "expected: %s, found %s",
870 constructor_type
->element_type()->name
,
872 return ir_rvalue::error_value(ctx
);
875 /* Attempt to convert the parameter to a constant valued expression.
876 * After doing so, track whether or not all the parameters to the
877 * constructor are trivially constant valued expressions.
879 ir_rvalue
*const constant
= result
->constant_expression_value();
881 if (constant
!= NULL
)
884 all_parameters_are_constant
= false;
886 ir
->replace_with(result
);
889 if (all_parameters_are_constant
)
890 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
892 ir_variable
*var
= new(ctx
) ir_variable(constructor_type
, "array_ctor",
894 instructions
->push_tail(var
);
897 foreach_in_list(ir_rvalue
, rhs
, &actual_parameters
) {
898 ir_rvalue
*lhs
= new(ctx
) ir_dereference_array(var
,
899 new(ctx
) ir_constant(i
));
901 ir_instruction
*assignment
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
902 instructions
->push_tail(assignment
);
907 return new(ctx
) ir_dereference_variable(var
);
912 * Try to convert a record constructor to a constant expression
915 constant_record_constructor(const glsl_type
*constructor_type
,
916 exec_list
*parameters
, void *mem_ctx
)
918 foreach_in_list(ir_instruction
, node
, parameters
) {
919 ir_constant
*constant
= node
->as_constant();
920 if (constant
== NULL
)
922 node
->replace_with(constant
);
925 return new(mem_ctx
) ir_constant(constructor_type
, parameters
);
930 * Determine if a list consists of a single scalar r-value
933 single_scalar_parameter(exec_list
*parameters
)
935 const ir_rvalue
*const p
= (ir_rvalue
*) parameters
->head
;
936 assert(((ir_rvalue
*)p
)->as_rvalue() != NULL
);
938 return (p
->type
->is_scalar() && p
->next
->is_tail_sentinel());
943 * Generate inline code for a vector constructor
945 * The generated constructor code will consist of a temporary variable
946 * declaration of the same type as the constructor. A sequence of assignments
947 * from constructor parameters to the temporary will follow.
950 * An \c ir_dereference_variable of the temprorary generated in the constructor
954 emit_inline_vector_constructor(const glsl_type
*type
,
955 exec_list
*instructions
,
956 exec_list
*parameters
,
959 assert(!parameters
->is_empty());
961 ir_variable
*var
= new(ctx
) ir_variable(type
, "vec_ctor", ir_var_temporary
);
962 instructions
->push_tail(var
);
964 /* There are two kinds of vector constructors.
966 * - Construct a vector from a single scalar by replicating that scalar to
967 * all components of the vector.
969 * - Construct a vector from an arbirary combination of vectors and
970 * scalars. The components of the constructor parameters are assigned
971 * to the vector in order until the vector is full.
973 const unsigned lhs_components
= type
->components();
974 if (single_scalar_parameter(parameters
)) {
975 ir_rvalue
*first_param
= (ir_rvalue
*)parameters
->head
;
976 ir_rvalue
*rhs
= new(ctx
) ir_swizzle(first_param
, 0, 0, 0, 0,
978 ir_dereference_variable
*lhs
= new(ctx
) ir_dereference_variable(var
);
979 const unsigned mask
= (1U << lhs_components
) - 1;
981 assert(rhs
->type
== lhs
->type
);
983 ir_instruction
*inst
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
, mask
);
984 instructions
->push_tail(inst
);
986 unsigned base_component
= 0;
987 unsigned base_lhs_component
= 0;
988 ir_constant_data data
;
989 unsigned constant_mask
= 0, constant_components
= 0;
991 memset(&data
, 0, sizeof(data
));
993 foreach_in_list(ir_rvalue
, param
, parameters
) {
994 unsigned rhs_components
= param
->type
->components();
996 /* Do not try to assign more components to the vector than it has!
998 if ((rhs_components
+ base_lhs_component
) > lhs_components
) {
999 rhs_components
= lhs_components
- base_lhs_component
;
1002 const ir_constant
*const c
= param
->as_constant();
1004 for (unsigned i
= 0; i
< rhs_components
; i
++) {
1005 switch (c
->type
->base_type
) {
1006 case GLSL_TYPE_UINT
:
1007 data
.u
[i
+ base_component
] = c
->get_uint_component(i
);
1010 data
.i
[i
+ base_component
] = c
->get_int_component(i
);
1012 case GLSL_TYPE_FLOAT
:
1013 data
.f
[i
+ base_component
] = c
->get_float_component(i
);
1015 case GLSL_TYPE_BOOL
:
1016 data
.b
[i
+ base_component
] = c
->get_bool_component(i
);
1019 assert(!"Should not get here.");
1024 /* Mask of fields to be written in the assignment.
1026 constant_mask
|= ((1U << rhs_components
) - 1) << base_lhs_component
;
1027 constant_components
+= rhs_components
;
1029 base_component
+= rhs_components
;
1031 /* Advance the component index by the number of components
1032 * that were just assigned.
1034 base_lhs_component
+= rhs_components
;
1037 if (constant_mask
!= 0) {
1038 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
1039 const glsl_type
*rhs_type
= glsl_type::get_instance(var
->type
->base_type
,
1040 constant_components
,
1042 ir_rvalue
*rhs
= new(ctx
) ir_constant(rhs_type
, &data
);
1044 ir_instruction
*inst
=
1045 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, constant_mask
);
1046 instructions
->push_tail(inst
);
1050 foreach_in_list(ir_rvalue
, param
, parameters
) {
1051 unsigned rhs_components
= param
->type
->components();
1053 /* Do not try to assign more components to the vector than it has!
1055 if ((rhs_components
+ base_component
) > lhs_components
) {
1056 rhs_components
= lhs_components
- base_component
;
1059 const ir_constant
*const c
= param
->as_constant();
1061 /* Mask of fields to be written in the assignment.
1063 const unsigned write_mask
= ((1U << rhs_components
) - 1)
1066 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
1068 /* Generate a swizzle so that LHS and RHS sizes match.
1071 new(ctx
) ir_swizzle(param
, 0, 1, 2, 3, rhs_components
);
1073 ir_instruction
*inst
=
1074 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, write_mask
);
1075 instructions
->push_tail(inst
);
1078 /* Advance the component index by the number of components that were
1081 base_component
+= rhs_components
;
1084 return new(ctx
) ir_dereference_variable(var
);
1089 * Generate assignment of a portion of a vector to a portion of a matrix column
1091 * \param src_base First component of the source to be used in assignment
1092 * \param column Column of destination to be assiged
1093 * \param row_base First component of the destination column to be assigned
1094 * \param count Number of components to be assigned
1097 * \c src_base + \c count must be less than or equal to the number of components
1098 * in the source vector.
1101 assign_to_matrix_column(ir_variable
*var
, unsigned column
, unsigned row_base
,
1102 ir_rvalue
*src
, unsigned src_base
, unsigned count
,
1105 ir_constant
*col_idx
= new(mem_ctx
) ir_constant(column
);
1106 ir_dereference
*column_ref
= new(mem_ctx
) ir_dereference_array(var
, col_idx
);
1108 assert(column_ref
->type
->components() >= (row_base
+ count
));
1109 assert(src
->type
->components() >= (src_base
+ count
));
1111 /* Generate a swizzle that extracts the number of components from the source
1112 * that are to be assigned to the column of the matrix.
1114 if (count
< src
->type
->vector_elements
) {
1115 src
= new(mem_ctx
) ir_swizzle(src
,
1116 src_base
+ 0, src_base
+ 1,
1117 src_base
+ 2, src_base
+ 3,
1121 /* Mask of fields to be written in the assignment.
1123 const unsigned write_mask
= ((1U << count
) - 1) << row_base
;
1125 return new(mem_ctx
) ir_assignment(column_ref
, src
, NULL
, write_mask
);
1130 * Generate inline code for a matrix constructor
1132 * The generated constructor code will consist of a temporary variable
1133 * declaration of the same type as the constructor. A sequence of assignments
1134 * from constructor parameters to the temporary will follow.
1137 * An \c ir_dereference_variable of the temprorary generated in the constructor
1141 emit_inline_matrix_constructor(const glsl_type
*type
,
1142 exec_list
*instructions
,
1143 exec_list
*parameters
,
1146 assert(!parameters
->is_empty());
1148 ir_variable
*var
= new(ctx
) ir_variable(type
, "mat_ctor", ir_var_temporary
);
1149 instructions
->push_tail(var
);
1151 /* There are three kinds of matrix constructors.
1153 * - Construct a matrix from a single scalar by replicating that scalar to
1154 * along the diagonal of the matrix and setting all other components to
1157 * - Construct a matrix from an arbirary combination of vectors and
1158 * scalars. The components of the constructor parameters are assigned
1159 * to the matrix in colum-major order until the matrix is full.
1161 * - Construct a matrix from a single matrix. The source matrix is copied
1162 * to the upper left portion of the constructed matrix, and the remaining
1163 * elements take values from the identity matrix.
1165 ir_rvalue
*const first_param
= (ir_rvalue
*) parameters
->head
;
1166 if (single_scalar_parameter(parameters
)) {
1167 /* Assign the scalar to the X component of a vec4, and fill the remaining
1168 * components with zero.
1170 ir_variable
*rhs_var
=
1171 new(ctx
) ir_variable(glsl_type::vec4_type
, "mat_ctor_vec",
1173 instructions
->push_tail(rhs_var
);
1175 ir_constant_data zero
;
1181 ir_instruction
*inst
=
1182 new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(rhs_var
),
1183 new(ctx
) ir_constant(rhs_var
->type
, &zero
),
1185 instructions
->push_tail(inst
);
1187 ir_dereference
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1189 inst
= new(ctx
) ir_assignment(rhs_ref
, first_param
, NULL
, 0x01);
1190 instructions
->push_tail(inst
);
1192 /* Assign the temporary vector to each column of the destination matrix
1193 * with a swizzle that puts the X component on the diagonal of the
1194 * matrix. In some cases this may mean that the X component does not
1195 * get assigned into the column at all (i.e., when the matrix has more
1196 * columns than rows).
1198 static const unsigned rhs_swiz
[4][4] = {
1205 const unsigned cols_to_init
= MIN2(type
->matrix_columns
,
1206 type
->vector_elements
);
1207 for (unsigned i
= 0; i
< cols_to_init
; i
++) {
1208 ir_constant
*const col_idx
= new(ctx
) ir_constant(i
);
1209 ir_rvalue
*const col_ref
= new(ctx
) ir_dereference_array(var
, col_idx
);
1211 ir_rvalue
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1212 ir_rvalue
*const rhs
= new(ctx
) ir_swizzle(rhs_ref
, rhs_swiz
[i
],
1213 type
->vector_elements
);
1215 inst
= new(ctx
) ir_assignment(col_ref
, rhs
, NULL
);
1216 instructions
->push_tail(inst
);
1219 for (unsigned i
= cols_to_init
; i
< type
->matrix_columns
; i
++) {
1220 ir_constant
*const col_idx
= new(ctx
) ir_constant(i
);
1221 ir_rvalue
*const col_ref
= new(ctx
) ir_dereference_array(var
, col_idx
);
1223 ir_rvalue
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1224 ir_rvalue
*const rhs
= new(ctx
) ir_swizzle(rhs_ref
, 1, 1, 1, 1,
1225 type
->vector_elements
);
1227 inst
= new(ctx
) ir_assignment(col_ref
, rhs
, NULL
);
1228 instructions
->push_tail(inst
);
1230 } else if (first_param
->type
->is_matrix()) {
1231 /* From page 50 (56 of the PDF) of the GLSL 1.50 spec:
1233 * "If a matrix is constructed from a matrix, then each component
1234 * (column i, row j) in the result that has a corresponding
1235 * component (column i, row j) in the argument will be initialized
1236 * from there. All other components will be initialized to the
1237 * identity matrix. If a matrix argument is given to a matrix
1238 * constructor, it is an error to have any other arguments."
1240 assert(first_param
->next
->is_tail_sentinel());
1241 ir_rvalue
*const src_matrix
= first_param
;
1243 /* If the source matrix is smaller, pre-initialize the relavent parts of
1244 * the destination matrix to the identity matrix.
1246 if ((src_matrix
->type
->matrix_columns
< var
->type
->matrix_columns
)
1247 || (src_matrix
->type
->vector_elements
< var
->type
->vector_elements
)) {
1249 /* If the source matrix has fewer rows, every column of the destination
1250 * must be initialized. Otherwise only the columns in the destination
1251 * that do not exist in the source must be initialized.
1254 (src_matrix
->type
->vector_elements
< var
->type
->vector_elements
)
1255 ? 0 : src_matrix
->type
->matrix_columns
;
1257 const glsl_type
*const col_type
= var
->type
->column_type();
1258 for (/* empty */; col
< var
->type
->matrix_columns
; col
++) {
1259 ir_constant_data ident
;
1268 ir_rvalue
*const rhs
= new(ctx
) ir_constant(col_type
, &ident
);
1270 ir_rvalue
*const lhs
=
1271 new(ctx
) ir_dereference_array(var
, new(ctx
) ir_constant(col
));
1273 ir_instruction
*inst
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
1274 instructions
->push_tail(inst
);
1278 /* Assign columns from the source matrix to the destination matrix.
1280 * Since the parameter will be used in the RHS of multiple assignments,
1281 * generate a temporary and copy the paramter there.
1283 ir_variable
*const rhs_var
=
1284 new(ctx
) ir_variable(first_param
->type
, "mat_ctor_mat",
1286 instructions
->push_tail(rhs_var
);
1288 ir_dereference
*const rhs_var_ref
=
1289 new(ctx
) ir_dereference_variable(rhs_var
);
1290 ir_instruction
*const inst
=
1291 new(ctx
) ir_assignment(rhs_var_ref
, first_param
, NULL
);
1292 instructions
->push_tail(inst
);
1294 const unsigned last_row
= MIN2(src_matrix
->type
->vector_elements
,
1295 var
->type
->vector_elements
);
1296 const unsigned last_col
= MIN2(src_matrix
->type
->matrix_columns
,
1297 var
->type
->matrix_columns
);
1299 unsigned swiz
[4] = { 0, 0, 0, 0 };
1300 for (unsigned i
= 1; i
< last_row
; i
++)
1303 const unsigned write_mask
= (1U << last_row
) - 1;
1305 for (unsigned i
= 0; i
< last_col
; i
++) {
1306 ir_dereference
*const lhs
=
1307 new(ctx
) ir_dereference_array(var
, new(ctx
) ir_constant(i
));
1308 ir_rvalue
*const rhs_col
=
1309 new(ctx
) ir_dereference_array(rhs_var
, new(ctx
) ir_constant(i
));
1311 /* If one matrix has columns that are smaller than the columns of the
1312 * other matrix, wrap the column access of the larger with a swizzle
1313 * so that the LHS and RHS of the assignment have the same size (and
1314 * therefore have the same type).
1316 * It would be perfectly valid to unconditionally generate the
1317 * swizzles, this this will typically result in a more compact IR tree.
1320 if (lhs
->type
->vector_elements
!= rhs_col
->type
->vector_elements
) {
1321 rhs
= new(ctx
) ir_swizzle(rhs_col
, swiz
, last_row
);
1326 ir_instruction
*inst
=
1327 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, write_mask
);
1328 instructions
->push_tail(inst
);
1331 const unsigned cols
= type
->matrix_columns
;
1332 const unsigned rows
= type
->vector_elements
;
1333 unsigned col_idx
= 0;
1334 unsigned row_idx
= 0;
1336 foreach_in_list(ir_rvalue
, rhs
, parameters
) {
1337 const unsigned components_remaining_this_column
= rows
- row_idx
;
1338 unsigned rhs_components
= rhs
->type
->components();
1339 unsigned rhs_base
= 0;
1341 /* Since the parameter might be used in the RHS of two assignments,
1342 * generate a temporary and copy the paramter there.
1344 ir_variable
*rhs_var
=
1345 new(ctx
) ir_variable(rhs
->type
, "mat_ctor_vec", ir_var_temporary
);
1346 instructions
->push_tail(rhs_var
);
1348 ir_dereference
*rhs_var_ref
=
1349 new(ctx
) ir_dereference_variable(rhs_var
);
1350 ir_instruction
*inst
= new(ctx
) ir_assignment(rhs_var_ref
, rhs
, NULL
);
1351 instructions
->push_tail(inst
);
1353 /* Assign the current parameter to as many components of the matrix
1356 * NOTE: A single vector parameter can span two matrix columns. A
1357 * single vec4, for example, can completely fill a mat2.
1359 if (rhs_components
>= components_remaining_this_column
) {
1360 const unsigned count
= MIN2(rhs_components
,
1361 components_remaining_this_column
);
1363 rhs_var_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1365 ir_instruction
*inst
= assign_to_matrix_column(var
, col_idx
,
1369 instructions
->push_tail(inst
);
1377 /* If there is data left in the parameter and components left to be
1378 * set in the destination, emit another assignment. It is possible
1379 * that the assignment could be of a vec4 to the last element of the
1380 * matrix. In this case col_idx==cols, but there is still data
1381 * left in the source parameter. Obviously, don't emit an assignment
1382 * to data outside the destination matrix.
1384 if ((col_idx
< cols
) && (rhs_base
< rhs_components
)) {
1385 const unsigned count
= rhs_components
- rhs_base
;
1387 rhs_var_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1389 ir_instruction
*inst
= assign_to_matrix_column(var
, col_idx
,
1394 instructions
->push_tail(inst
);
1401 return new(ctx
) ir_dereference_variable(var
);
1406 emit_inline_record_constructor(const glsl_type
*type
,
1407 exec_list
*instructions
,
1408 exec_list
*parameters
,
1411 ir_variable
*const var
=
1412 new(mem_ctx
) ir_variable(type
, "record_ctor", ir_var_temporary
);
1413 ir_dereference_variable
*const d
= new(mem_ctx
) ir_dereference_variable(var
);
1415 instructions
->push_tail(var
);
1417 exec_node
*node
= parameters
->head
;
1418 for (unsigned i
= 0; i
< type
->length
; i
++) {
1419 assert(!node
->is_tail_sentinel());
1421 ir_dereference
*const lhs
=
1422 new(mem_ctx
) ir_dereference_record(d
->clone(mem_ctx
, NULL
),
1423 type
->fields
.structure
[i
].name
);
1425 ir_rvalue
*const rhs
= ((ir_instruction
*) node
)->as_rvalue();
1426 assert(rhs
!= NULL
);
1428 ir_instruction
*const assign
= new(mem_ctx
) ir_assignment(lhs
, rhs
, NULL
);
1430 instructions
->push_tail(assign
);
1439 process_record_constructor(exec_list
*instructions
,
1440 const glsl_type
*constructor_type
,
1441 YYLTYPE
*loc
, exec_list
*parameters
,
1442 struct _mesa_glsl_parse_state
*state
)
1445 exec_list actual_parameters
;
1447 process_parameters(instructions
, &actual_parameters
,
1450 exec_node
*node
= actual_parameters
.head
;
1451 for (unsigned i
= 0; i
< constructor_type
->length
; i
++) {
1452 ir_rvalue
*ir
= (ir_rvalue
*) node
;
1454 if (node
->is_tail_sentinel()) {
1455 _mesa_glsl_error(loc
, state
,
1456 "insufficient parameters to constructor for `%s'",
1457 constructor_type
->name
);
1458 return ir_rvalue::error_value(ctx
);
1461 if (apply_implicit_conversion(constructor_type
->fields
.structure
[i
].type
,
1463 node
->replace_with(ir
);
1465 _mesa_glsl_error(loc
, state
,
1466 "parameter type mismatch in constructor for `%s.%s' "
1468 constructor_type
->name
,
1469 constructor_type
->fields
.structure
[i
].name
,
1471 constructor_type
->fields
.structure
[i
].type
->name
);
1472 return ir_rvalue::error_value(ctx
);;
1478 if (!node
->is_tail_sentinel()) {
1479 _mesa_glsl_error(loc
, state
, "too many parameters in constructor "
1480 "for `%s'", constructor_type
->name
);
1481 return ir_rvalue::error_value(ctx
);
1484 ir_rvalue
*const constant
=
1485 constant_record_constructor(constructor_type
, &actual_parameters
,
1488 return (constant
!= NULL
)
1490 : emit_inline_record_constructor(constructor_type
, instructions
,
1491 &actual_parameters
, state
);
1496 ast_function_expression::hir(exec_list
*instructions
,
1497 struct _mesa_glsl_parse_state
*state
)
1500 /* There are three sorts of function calls.
1502 * 1. constructors - The first subexpression is an ast_type_specifier.
1503 * 2. methods - Only the .length() method of array types.
1504 * 3. functions - Calls to regular old functions.
1506 * Method calls are actually detected when the ast_field_selection
1507 * expression is handled.
1509 if (is_constructor()) {
1510 const ast_type_specifier
*type
= (ast_type_specifier
*) subexpressions
[0];
1511 YYLTYPE loc
= type
->get_location();
1514 const glsl_type
*const constructor_type
= type
->glsl_type(& name
, state
);
1516 /* constructor_type can be NULL if a variable with the same name as the
1517 * structure has come into scope.
1519 if (constructor_type
== NULL
) {
1520 _mesa_glsl_error(& loc
, state
, "unknown type `%s' (structure name "
1521 "may be shadowed by a variable with the same name)",
1523 return ir_rvalue::error_value(ctx
);
1527 /* Constructors for samplers are illegal.
1529 if (constructor_type
->is_sampler()) {
1530 _mesa_glsl_error(& loc
, state
, "cannot construct sampler type `%s'",
1531 constructor_type
->name
);
1532 return ir_rvalue::error_value(ctx
);
1535 if (constructor_type
->is_array()) {
1536 if (!state
->check_version(120, 300, &loc
,
1537 "array constructors forbidden")) {
1538 return ir_rvalue::error_value(ctx
);
1541 return process_array_constructor(instructions
, constructor_type
,
1542 & loc
, &this->expressions
, state
);
1546 /* There are two kinds of constructor calls. Constructors for arrays and
1547 * structures must have the exact number of arguments with matching types
1548 * in the correct order. These constructors follow essentially the same
1549 * type matching rules as functions.
1551 * Constructors for built-in language types, such as mat4 and vec2, are
1552 * free form. The only requirements are that the parameters must provide
1553 * enough values of the correct scalar type and that no arguments are
1554 * given past the last used argument.
1556 * When using the C-style initializer syntax from GLSL 4.20, constructors
1557 * must have the exact number of arguments with matching types in the
1560 if (constructor_type
->is_record()) {
1561 return process_record_constructor(instructions
, constructor_type
,
1562 &loc
, &this->expressions
,
1566 if (!constructor_type
->is_numeric() && !constructor_type
->is_boolean())
1567 return ir_rvalue::error_value(ctx
);
1569 /* Total number of components of the type being constructed. */
1570 const unsigned type_components
= constructor_type
->components();
1572 /* Number of components from parameters that have actually been
1573 * consumed. This is used to perform several kinds of error checking.
1575 unsigned components_used
= 0;
1577 unsigned matrix_parameters
= 0;
1578 unsigned nonmatrix_parameters
= 0;
1579 exec_list actual_parameters
;
1581 foreach_list_typed(ast_node
, ast
, link
, &this->expressions
) {
1582 ir_rvalue
*result
= ast
->hir(instructions
, state
);
1584 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
1586 * "It is an error to provide extra arguments beyond this
1587 * last used argument."
1589 if (components_used
>= type_components
) {
1590 _mesa_glsl_error(& loc
, state
, "too many parameters to `%s' "
1592 constructor_type
->name
);
1593 return ir_rvalue::error_value(ctx
);
1596 if (!result
->type
->is_numeric() && !result
->type
->is_boolean()) {
1597 _mesa_glsl_error(& loc
, state
, "cannot construct `%s' from a "
1598 "non-numeric data type",
1599 constructor_type
->name
);
1600 return ir_rvalue::error_value(ctx
);
1603 /* Count the number of matrix and nonmatrix parameters. This
1604 * is used below to enforce some of the constructor rules.
1606 if (result
->type
->is_matrix())
1607 matrix_parameters
++;
1609 nonmatrix_parameters
++;
1611 actual_parameters
.push_tail(result
);
1612 components_used
+= result
->type
->components();
1615 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
1617 * "It is an error to construct matrices from other matrices. This
1618 * is reserved for future use."
1620 if (matrix_parameters
> 0
1621 && constructor_type
->is_matrix()
1622 && !state
->check_version(120, 100, &loc
,
1623 "cannot construct `%s' from a matrix",
1624 constructor_type
->name
)) {
1625 return ir_rvalue::error_value(ctx
);
1628 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
1630 * "If a matrix argument is given to a matrix constructor, it is
1631 * an error to have any other arguments."
1633 if ((matrix_parameters
> 0)
1634 && ((matrix_parameters
+ nonmatrix_parameters
) > 1)
1635 && constructor_type
->is_matrix()) {
1636 _mesa_glsl_error(& loc
, state
, "for matrix `%s' constructor, "
1637 "matrix must be only parameter",
1638 constructor_type
->name
);
1639 return ir_rvalue::error_value(ctx
);
1642 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
1644 * "In these cases, there must be enough components provided in the
1645 * arguments to provide an initializer for every component in the
1646 * constructed value."
1648 if (components_used
< type_components
&& components_used
!= 1
1649 && matrix_parameters
== 0) {
1650 _mesa_glsl_error(& loc
, state
, "too few components to construct "
1652 constructor_type
->name
);
1653 return ir_rvalue::error_value(ctx
);
1656 /* Later, we cast each parameter to the same base type as the
1657 * constructor. Since there are no non-floating point matrices, we
1658 * need to break them up into a series of column vectors.
1660 if (constructor_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1661 foreach_in_list_safe(ir_rvalue
, matrix
, &actual_parameters
) {
1662 if (!matrix
->type
->is_matrix())
1665 /* Create a temporary containing the matrix. */
1666 ir_variable
*var
= new(ctx
) ir_variable(matrix
->type
, "matrix_tmp",
1668 instructions
->push_tail(var
);
1669 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
)
1670 ir_dereference_variable(var
), matrix
, NULL
));
1671 var
->constant_value
= matrix
->constant_expression_value();
1673 /* Replace the matrix with dereferences of its columns. */
1674 for (int i
= 0; i
< matrix
->type
->matrix_columns
; i
++) {
1675 matrix
->insert_before(new (ctx
) ir_dereference_array(var
,
1676 new(ctx
) ir_constant(i
)));
1682 bool all_parameters_are_constant
= true;
1684 /* Type cast each parameter and, if possible, fold constants.*/
1685 foreach_in_list_safe(ir_rvalue
, ir
, &actual_parameters
) {
1686 const glsl_type
*desired_type
=
1687 glsl_type::get_instance(constructor_type
->base_type
,
1688 ir
->type
->vector_elements
,
1689 ir
->type
->matrix_columns
);
1690 ir_rvalue
*result
= convert_component(ir
, desired_type
);
1692 /* Attempt to convert the parameter to a constant valued expression.
1693 * After doing so, track whether or not all the parameters to the
1694 * constructor are trivially constant valued expressions.
1696 ir_rvalue
*const constant
= result
->constant_expression_value();
1698 if (constant
!= NULL
)
1701 all_parameters_are_constant
= false;
1704 ir
->replace_with(result
);
1708 /* If all of the parameters are trivially constant, create a
1709 * constant representing the complete collection of parameters.
1711 if (all_parameters_are_constant
) {
1712 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
1713 } else if (constructor_type
->is_scalar()) {
1714 return dereference_component((ir_rvalue
*) actual_parameters
.head
,
1716 } else if (constructor_type
->is_vector()) {
1717 return emit_inline_vector_constructor(constructor_type
,
1722 assert(constructor_type
->is_matrix());
1723 return emit_inline_matrix_constructor(constructor_type
,
1729 const ast_expression
*id
= subexpressions
[0];
1730 const char *func_name
= id
->primary_expression
.identifier
;
1731 YYLTYPE loc
= get_location();
1732 exec_list actual_parameters
;
1734 process_parameters(instructions
, &actual_parameters
, &this->expressions
,
1737 ir_function_signature
*sig
=
1738 match_function_by_name(func_name
, &actual_parameters
, state
);
1740 ir_rvalue
*value
= NULL
;
1742 no_matching_function_error(func_name
, &loc
, &actual_parameters
, state
);
1743 value
= ir_rvalue::error_value(ctx
);
1744 } else if (!verify_parameter_modes(state
, sig
, actual_parameters
, this->expressions
)) {
1745 /* an error has already been emitted */
1746 value
= ir_rvalue::error_value(ctx
);
1748 value
= generate_call(instructions
, sig
, &actual_parameters
, state
);
1754 return ir_rvalue::error_value(ctx
);
1758 ast_aggregate_initializer::hir(exec_list
*instructions
,
1759 struct _mesa_glsl_parse_state
*state
)
1762 YYLTYPE loc
= this->get_location();
1764 if (!this->constructor_type
) {
1765 _mesa_glsl_error(&loc
, state
, "type of C-style initializer unknown");
1766 return ir_rvalue::error_value(ctx
);
1768 const glsl_type
*const constructor_type
= this->constructor_type
;
1770 if (!state
->ARB_shading_language_420pack_enable
) {
1771 _mesa_glsl_error(&loc
, state
, "C-style initialization requires the "
1772 "GL_ARB_shading_language_420pack extension");
1773 return ir_rvalue::error_value(ctx
);
1776 if (constructor_type
->is_array()) {
1777 return process_array_constructor(instructions
, constructor_type
, &loc
,
1778 &this->expressions
, state
);
1781 if (constructor_type
->is_record()) {
1782 return process_record_constructor(instructions
, constructor_type
, &loc
,
1783 &this->expressions
, state
);
1786 return process_vec_mat_constructor(instructions
, constructor_type
, &loc
,
1787 &this->expressions
, state
);