2 * Copyright © 2010 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
24 #include "glsl_symbol_table.h"
26 #include "glsl_types.h"
28 #include "main/core.h" /* for MIN2 */
31 convert_component(ir_rvalue
*src
, const glsl_type
*desired_type
);
34 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
35 struct _mesa_glsl_parse_state
*state
);
38 process_parameters(exec_list
*instructions
, exec_list
*actual_parameters
,
39 exec_list
*parameters
,
40 struct _mesa_glsl_parse_state
*state
)
44 foreach_list (n
, parameters
) {
45 ast_node
*const ast
= exec_node_data(ast_node
, n
, link
);
46 ir_rvalue
*result
= ast
->hir(instructions
, state
);
48 ir_constant
*const constant
= result
->constant_expression_value();
52 actual_parameters
->push_tail(result
);
61 * Generate a source prototype for a function signature
63 * \param return_type Return type of the function. May be \c NULL.
64 * \param name Name of the function.
65 * \param parameters List of \c ir_instruction nodes representing the
66 * parameter list for the function. This may be either a
67 * formal (\c ir_variable) or actual (\c ir_rvalue)
68 * parameter list. Only the type is used.
71 * A ralloced string representing the prototype of the function.
74 prototype_string(const glsl_type
*return_type
, const char *name
,
75 exec_list
*parameters
)
79 if (return_type
!= NULL
)
80 str
= ralloc_asprintf(NULL
, "%s ", return_type
->name
);
82 ralloc_asprintf_append(&str
, "%s(", name
);
84 const char *comma
= "";
85 foreach_list(node
, parameters
) {
86 const ir_variable
*const param
= (ir_variable
*) node
;
88 ralloc_asprintf_append(&str
, "%s%s", comma
, param
->type
->name
);
92 ralloc_strcat(&str
, ")");
97 * Verify that 'out' and 'inout' actual parameters are lvalues. Also, verify
98 * that 'const_in' formal parameters (an extension in our IR) correspond to
99 * ir_constant actual parameters.
102 verify_parameter_modes(_mesa_glsl_parse_state
*state
,
103 ir_function_signature
*sig
,
104 exec_list
&actual_ir_parameters
,
105 exec_list
&actual_ast_parameters
)
107 exec_node
*actual_ir_node
= actual_ir_parameters
.head
;
108 exec_node
*actual_ast_node
= actual_ast_parameters
.head
;
110 foreach_list(formal_node
, &sig
->parameters
) {
111 /* The lists must be the same length. */
112 assert(!actual_ir_node
->is_tail_sentinel());
113 assert(!actual_ast_node
->is_tail_sentinel());
115 const ir_variable
*const formal
= (ir_variable
*) formal_node
;
116 const ir_rvalue
*const actual
= (ir_rvalue
*) actual_ir_node
;
117 const ast_expression
*const actual_ast
=
118 exec_node_data(ast_expression
, actual_ast_node
, link
);
120 /* FIXME: 'loc' is incorrect (as of 2011-01-21). It is always
123 YYLTYPE loc
= actual_ast
->get_location();
125 /* Verify that 'const_in' parameters are ir_constants. */
126 if (formal
->mode
== ir_var_const_in
&&
127 actual
->ir_type
!= ir_type_constant
) {
128 _mesa_glsl_error(&loc
, state
,
129 "parameter `in %s' must be a constant expression",
134 /* Verify that 'out' and 'inout' actual parameters are lvalues. */
135 if (formal
->mode
== ir_var_out
|| formal
->mode
== ir_var_inout
) {
136 const char *mode
= NULL
;
137 switch (formal
->mode
) {
138 case ir_var_out
: mode
= "out"; break;
139 case ir_var_inout
: mode
= "inout"; break;
140 default: assert(false); break;
143 /* This AST-based check catches errors like f(i++). The IR-based
144 * is_lvalue() is insufficient because the actual parameter at the
145 * IR-level is just a temporary value, which is an l-value.
147 if (actual_ast
->non_lvalue_description
!= NULL
) {
148 _mesa_glsl_error(&loc
, state
,
149 "function parameter '%s %s' references a %s",
151 actual_ast
->non_lvalue_description
);
155 ir_variable
*var
= actual
->variable_referenced();
157 var
->assigned
= true;
159 if (var
&& var
->read_only
) {
160 _mesa_glsl_error(&loc
, state
,
161 "function parameter '%s %s' references the "
162 "read-only variable '%s'",
164 actual
->variable_referenced()->name
);
166 } else if (!actual
->is_lvalue()) {
167 _mesa_glsl_error(&loc
, state
,
168 "function parameter '%s %s' is not an lvalue",
174 actual_ir_node
= actual_ir_node
->next
;
175 actual_ast_node
= actual_ast_node
->next
;
181 * If a function call is generated, \c call_ir will point to it on exit.
182 * Otherwise \c call_ir will be set to \c NULL.
185 generate_call(exec_list
*instructions
, ir_function_signature
*sig
,
186 YYLTYPE
*loc
, exec_list
*actual_parameters
,
188 struct _mesa_glsl_parse_state
*state
)
191 exec_list post_call_conversions
;
195 /* Perform implicit conversion of arguments. For out parameters, we need
196 * to place them in a temporary variable and do the conversion after the
197 * call takes place. Since we haven't emitted the call yet, we'll place
198 * the post-call conversions in a temporary exec_list, and emit them later.
200 exec_list_iterator actual_iter
= actual_parameters
->iterator();
201 exec_list_iterator formal_iter
= sig
->parameters
.iterator();
203 while (actual_iter
.has_next()) {
204 ir_rvalue
*actual
= (ir_rvalue
*) actual_iter
.get();
205 ir_variable
*formal
= (ir_variable
*) formal_iter
.get();
207 assert(actual
!= NULL
);
208 assert(formal
!= NULL
);
210 if (formal
->type
->is_numeric() || formal
->type
->is_boolean()) {
211 switch (formal
->mode
) {
212 case ir_var_const_in
:
215 = convert_component(actual
, formal
->type
);
216 actual
->replace_with(converted
);
220 if (actual
->type
!= formal
->type
) {
221 /* To convert an out parameter, we need to create a
222 * temporary variable to hold the value before conversion,
223 * and then perform the conversion after the function call
226 * This has the effect of transforming code like this:
232 * Into IR that's equivalent to this:
236 * int out_parameter_conversion;
237 * f(out_parameter_conversion);
238 * value = float(out_parameter_conversion);
241 new(ctx
) ir_variable(formal
->type
,
242 "out_parameter_conversion",
244 instructions
->push_tail(tmp
);
245 ir_dereference_variable
*deref_tmp_1
246 = new(ctx
) ir_dereference_variable(tmp
);
247 ir_dereference_variable
*deref_tmp_2
248 = new(ctx
) ir_dereference_variable(tmp
);
249 ir_rvalue
*converted_tmp
250 = convert_component(deref_tmp_1
, actual
->type
);
251 ir_assignment
*assignment
252 = new(ctx
) ir_assignment(actual
, converted_tmp
);
253 post_call_conversions
.push_tail(assignment
);
254 actual
->replace_with(deref_tmp_2
);
258 /* Inout parameters should never require conversion, since that
259 * would require an implicit conversion to exist both to and
260 * from the formal parameter type, and there are no
261 * bidirectional implicit conversions.
263 assert (actual
->type
== formal
->type
);
266 assert (!"Illegal formal parameter mode");
275 /* If the function call is a constant expression, don't generate any
276 * instructions; just generate an ir_constant.
278 * Function calls were first allowed to be constant expressions in GLSL 1.20.
280 if (state
->language_version
>= 120) {
281 ir_constant
*value
= sig
->constant_expression_value(actual_parameters
, NULL
);
287 ir_dereference_variable
*deref
= NULL
;
288 if (!sig
->return_type
->is_void()) {
289 /* Create a new temporary to hold the return value. */
292 var
= new(ctx
) ir_variable(sig
->return_type
,
293 ralloc_asprintf(ctx
, "%s_retval",
294 sig
->function_name()),
296 instructions
->push_tail(var
);
298 deref
= new(ctx
) ir_dereference_variable(var
);
300 ir_call
*call
= new(ctx
) ir_call(sig
, deref
, actual_parameters
);
301 instructions
->push_tail(call
);
303 /* Also emit any necessary out-parameter conversions. */
304 instructions
->append_list(&post_call_conversions
);
306 return deref
? deref
->clone(ctx
, NULL
) : NULL
;
310 * Given a function name and parameter list, find the matching signature.
312 static ir_function_signature
*
313 match_function_by_name(const char *name
,
314 exec_list
*actual_parameters
,
315 struct _mesa_glsl_parse_state
*state
)
318 ir_function
*f
= state
->symbols
->get_function(name
);
319 ir_function_signature
*local_sig
= NULL
;
320 ir_function_signature
*sig
= NULL
;
322 /* Is the function hidden by a record type constructor? */
323 if (state
->symbols
->get_type(name
))
324 goto done
; /* no match */
326 /* Is the function hidden by a variable (impossible in 1.10)? */
327 if (state
->language_version
!= 110 && state
->symbols
->get_variable(name
))
328 goto done
; /* no match */
331 /* Look for a match in the local shader. If exact, we're done. */
332 bool is_exact
= false;
333 sig
= local_sig
= f
->matching_signature(actual_parameters
, &is_exact
);
337 if (!state
->es_shader
&& f
->has_user_signature()) {
338 /* In desktop GL, the presence of a user-defined signature hides any
339 * built-in signatures, so we must ignore them. In contrast, in ES2
340 * user-defined signatures add new overloads, so we must proceed.
346 /* Local shader has no exact candidates; check the built-ins. */
347 _mesa_glsl_initialize_functions(state
);
348 for (unsigned i
= 0; i
< state
->num_builtins_to_link
; i
++) {
349 ir_function
*builtin
=
350 state
->builtins_to_link
[i
]->symbols
->get_function(name
);
354 bool is_exact
= false;
355 ir_function_signature
*builtin_sig
=
356 builtin
->matching_signature(actual_parameters
, &is_exact
);
358 if (builtin_sig
== NULL
)
361 /* If the built-in signature is exact, we can stop. */
368 /* We found an inexact match, which is better than nothing. However,
369 * we should keep searching for an exact match.
377 /* If the match is from a linked built-in shader, import the prototype. */
378 if (sig
!= local_sig
) {
380 f
= new(ctx
) ir_function(name
);
381 state
->symbols
->add_global_function(f
);
382 emit_function(state
, f
);
384 f
->add_signature(sig
->clone_prototype(f
, NULL
));
391 * Raise a "no matching function" error, listing all possible overloads the
392 * compiler considered so developers can figure out what went wrong.
395 no_matching_function_error(const char *name
,
397 exec_list
*actual_parameters
,
398 _mesa_glsl_parse_state
*state
)
400 char *str
= prototype_string(NULL
, name
, actual_parameters
);
401 _mesa_glsl_error(loc
, state
, "no matching function for call to `%s'", str
);
404 const char *prefix
= "candidates are: ";
406 for (int i
= -1; i
< (int) state
->num_builtins_to_link
; i
++) {
407 glsl_symbol_table
*syms
= i
>= 0 ? state
->builtins_to_link
[i
]->symbols
409 ir_function
*f
= syms
->get_function(name
);
413 foreach_list (node
, &f
->signatures
) {
414 ir_function_signature
*sig
= (ir_function_signature
*) node
;
416 str
= prototype_string(sig
->return_type
, f
->name
, &sig
->parameters
);
417 _mesa_glsl_error(loc
, state
, "%s%s", prefix
, str
);
426 * Perform automatic type conversion of constructor parameters
428 * This implements the rules in the "Conversion and Scalar Constructors"
429 * section (GLSL 1.10 section 5.4.1), not the "Implicit Conversions" rules.
432 convert_component(ir_rvalue
*src
, const glsl_type
*desired_type
)
434 void *ctx
= ralloc_parent(src
);
435 const unsigned a
= desired_type
->base_type
;
436 const unsigned b
= src
->type
->base_type
;
437 ir_expression
*result
= NULL
;
439 if (src
->type
->is_error())
442 assert(a
<= GLSL_TYPE_BOOL
);
443 assert(b
<= GLSL_TYPE_BOOL
);
452 result
= new(ctx
) ir_expression(ir_unop_i2u
, src
);
454 case GLSL_TYPE_FLOAT
:
455 result
= new(ctx
) ir_expression(ir_unop_f2u
, src
);
458 result
= new(ctx
) ir_expression(ir_unop_i2u
,
459 new(ctx
) ir_expression(ir_unop_b2i
, src
));
466 result
= new(ctx
) ir_expression(ir_unop_u2i
, src
);
468 case GLSL_TYPE_FLOAT
:
469 result
= new(ctx
) ir_expression(ir_unop_f2i
, src
);
472 result
= new(ctx
) ir_expression(ir_unop_b2i
, src
);
476 case GLSL_TYPE_FLOAT
:
479 result
= new(ctx
) ir_expression(ir_unop_u2f
, desired_type
, src
, NULL
);
482 result
= new(ctx
) ir_expression(ir_unop_i2f
, desired_type
, src
, NULL
);
485 result
= new(ctx
) ir_expression(ir_unop_b2f
, desired_type
, src
, NULL
);
492 result
= new(ctx
) ir_expression(ir_unop_i2b
,
493 new(ctx
) ir_expression(ir_unop_u2i
, src
));
496 result
= new(ctx
) ir_expression(ir_unop_i2b
, desired_type
, src
, NULL
);
498 case GLSL_TYPE_FLOAT
:
499 result
= new(ctx
) ir_expression(ir_unop_f2b
, desired_type
, src
, NULL
);
505 assert(result
!= NULL
);
506 assert(result
->type
== desired_type
);
508 /* Try constant folding; it may fold in the conversion we just added. */
509 ir_constant
*const constant
= result
->constant_expression_value();
510 return (constant
!= NULL
) ? (ir_rvalue
*) constant
: (ir_rvalue
*) result
;
514 * Dereference a specific component from a scalar, vector, or matrix
517 dereference_component(ir_rvalue
*src
, unsigned component
)
519 void *ctx
= ralloc_parent(src
);
520 assert(component
< src
->type
->components());
522 /* If the source is a constant, just create a new constant instead of a
523 * dereference of the existing constant.
525 ir_constant
*constant
= src
->as_constant();
527 return new(ctx
) ir_constant(constant
, component
);
529 if (src
->type
->is_scalar()) {
531 } else if (src
->type
->is_vector()) {
532 return new(ctx
) ir_swizzle(src
, component
, 0, 0, 0, 1);
534 assert(src
->type
->is_matrix());
536 /* Dereference a row of the matrix, then call this function again to get
537 * a specific element from that row.
539 const int c
= component
/ src
->type
->column_type()->vector_elements
;
540 const int r
= component
% src
->type
->column_type()->vector_elements
;
541 ir_constant
*const col_index
= new(ctx
) ir_constant(c
);
542 ir_dereference
*const col
= new(ctx
) ir_dereference_array(src
, col_index
);
544 col
->type
= src
->type
->column_type();
546 return dereference_component(col
, r
);
549 assert(!"Should not get here.");
555 process_array_constructor(exec_list
*instructions
,
556 const glsl_type
*constructor_type
,
557 YYLTYPE
*loc
, exec_list
*parameters
,
558 struct _mesa_glsl_parse_state
*state
)
561 /* Array constructors come in two forms: sized and unsized. Sized array
562 * constructors look like 'vec4[2](a, b)', where 'a' and 'b' are vec4
563 * variables. In this case the number of parameters must exactly match the
564 * specified size of the array.
566 * Unsized array constructors look like 'vec4[](a, b)', where 'a' and 'b'
567 * are vec4 variables. In this case the size of the array being constructed
568 * is determined by the number of parameters.
570 * From page 52 (page 58 of the PDF) of the GLSL 1.50 spec:
572 * "There must be exactly the same number of arguments as the size of
573 * the array being constructed. If no size is present in the
574 * constructor, then the array is explicitly sized to the number of
575 * arguments provided. The arguments are assigned in order, starting at
576 * element 0, to the elements of the constructed array. Each argument
577 * must be the same type as the element type of the array, or be a type
578 * that can be converted to the element type of the array according to
579 * Section 4.1.10 "Implicit Conversions.""
581 exec_list actual_parameters
;
582 const unsigned parameter_count
=
583 process_parameters(instructions
, &actual_parameters
, parameters
, state
);
585 if ((parameter_count
== 0)
586 || ((constructor_type
->length
!= 0)
587 && (constructor_type
->length
!= parameter_count
))) {
588 const unsigned min_param
= (constructor_type
->length
== 0)
589 ? 1 : constructor_type
->length
;
591 _mesa_glsl_error(loc
, state
, "array constructor must have %s %u "
593 (constructor_type
->length
!= 0) ? "at least" : "exactly",
594 min_param
, (min_param
<= 1) ? "" : "s");
595 return ir_rvalue::error_value(ctx
);
598 if (constructor_type
->length
== 0) {
600 glsl_type::get_array_instance(constructor_type
->element_type(),
602 assert(constructor_type
!= NULL
);
603 assert(constructor_type
->length
== parameter_count
);
606 bool all_parameters_are_constant
= true;
608 /* Type cast each parameter and, if possible, fold constants. */
609 foreach_list_safe(n
, &actual_parameters
) {
610 ir_rvalue
*ir
= (ir_rvalue
*) n
;
611 ir_rvalue
*result
= ir
;
613 /* Apply implicit conversions (not the scalar constructor rules!). See
614 * the spec quote above. */
615 if (constructor_type
->element_type()->is_float()) {
616 const glsl_type
*desired_type
=
617 glsl_type::get_instance(GLSL_TYPE_FLOAT
,
618 ir
->type
->vector_elements
,
619 ir
->type
->matrix_columns
);
620 if (result
->type
->can_implicitly_convert_to(desired_type
)) {
621 /* Even though convert_component() implements the constructor
622 * conversion rules (not the implicit conversion rules), its safe
623 * to use it here because we already checked that the implicit
624 * conversion is legal.
626 result
= convert_component(ir
, desired_type
);
630 if (result
->type
!= constructor_type
->element_type()) {
631 _mesa_glsl_error(loc
, state
, "type error in array constructor: "
632 "expected: %s, found %s",
633 constructor_type
->element_type()->name
,
637 /* Attempt to convert the parameter to a constant valued expression.
638 * After doing so, track whether or not all the parameters to the
639 * constructor are trivially constant valued expressions.
641 ir_rvalue
*const constant
= result
->constant_expression_value();
643 if (constant
!= NULL
)
646 all_parameters_are_constant
= false;
648 ir
->replace_with(result
);
651 if (all_parameters_are_constant
)
652 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
654 ir_variable
*var
= new(ctx
) ir_variable(constructor_type
, "array_ctor",
656 instructions
->push_tail(var
);
659 foreach_list(node
, &actual_parameters
) {
660 ir_rvalue
*rhs
= (ir_rvalue
*) node
;
661 ir_rvalue
*lhs
= new(ctx
) ir_dereference_array(var
,
662 new(ctx
) ir_constant(i
));
664 ir_instruction
*assignment
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
665 instructions
->push_tail(assignment
);
670 return new(ctx
) ir_dereference_variable(var
);
675 * Try to convert a record constructor to a constant expression
678 constant_record_constructor(const glsl_type
*constructor_type
,
679 exec_list
*parameters
, void *mem_ctx
)
681 foreach_list(node
, parameters
) {
682 ir_constant
*constant
= ((ir_instruction
*) node
)->as_constant();
683 if (constant
== NULL
)
685 node
->replace_with(constant
);
688 return new(mem_ctx
) ir_constant(constructor_type
, parameters
);
693 * Determine if a list consists of a single scalar r-value
696 single_scalar_parameter(exec_list
*parameters
)
698 const ir_rvalue
*const p
= (ir_rvalue
*) parameters
->head
;
699 assert(((ir_rvalue
*)p
)->as_rvalue() != NULL
);
701 return (p
->type
->is_scalar() && p
->next
->is_tail_sentinel());
706 * Generate inline code for a vector constructor
708 * The generated constructor code will consist of a temporary variable
709 * declaration of the same type as the constructor. A sequence of assignments
710 * from constructor parameters to the temporary will follow.
713 * An \c ir_dereference_variable of the temprorary generated in the constructor
717 emit_inline_vector_constructor(const glsl_type
*type
,
718 exec_list
*instructions
,
719 exec_list
*parameters
,
722 assert(!parameters
->is_empty());
724 ir_variable
*var
= new(ctx
) ir_variable(type
, "vec_ctor", ir_var_temporary
);
725 instructions
->push_tail(var
);
727 /* There are two kinds of vector constructors.
729 * - Construct a vector from a single scalar by replicating that scalar to
730 * all components of the vector.
732 * - Construct a vector from an arbirary combination of vectors and
733 * scalars. The components of the constructor parameters are assigned
734 * to the vector in order until the vector is full.
736 const unsigned lhs_components
= type
->components();
737 if (single_scalar_parameter(parameters
)) {
738 ir_rvalue
*first_param
= (ir_rvalue
*)parameters
->head
;
739 ir_rvalue
*rhs
= new(ctx
) ir_swizzle(first_param
, 0, 0, 0, 0,
741 ir_dereference_variable
*lhs
= new(ctx
) ir_dereference_variable(var
);
742 const unsigned mask
= (1U << lhs_components
) - 1;
744 assert(rhs
->type
== lhs
->type
);
746 ir_instruction
*inst
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
, mask
);
747 instructions
->push_tail(inst
);
749 unsigned base_component
= 0;
750 unsigned base_lhs_component
= 0;
751 ir_constant_data data
;
752 unsigned constant_mask
= 0, constant_components
= 0;
754 memset(&data
, 0, sizeof(data
));
756 foreach_list(node
, parameters
) {
757 ir_rvalue
*param
= (ir_rvalue
*) node
;
758 unsigned rhs_components
= param
->type
->components();
760 /* Do not try to assign more components to the vector than it has!
762 if ((rhs_components
+ base_lhs_component
) > lhs_components
) {
763 rhs_components
= lhs_components
- base_lhs_component
;
766 const ir_constant
*const c
= param
->as_constant();
768 for (unsigned i
= 0; i
< rhs_components
; i
++) {
769 switch (c
->type
->base_type
) {
771 data
.u
[i
+ base_component
] = c
->get_uint_component(i
);
774 data
.i
[i
+ base_component
] = c
->get_int_component(i
);
776 case GLSL_TYPE_FLOAT
:
777 data
.f
[i
+ base_component
] = c
->get_float_component(i
);
780 data
.b
[i
+ base_component
] = c
->get_bool_component(i
);
783 assert(!"Should not get here.");
788 /* Mask of fields to be written in the assignment.
790 constant_mask
|= ((1U << rhs_components
) - 1) << base_lhs_component
;
791 constant_components
+= rhs_components
;
793 base_component
+= rhs_components
;
795 /* Advance the component index by the number of components
796 * that were just assigned.
798 base_lhs_component
+= rhs_components
;
801 if (constant_mask
!= 0) {
802 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
803 const glsl_type
*rhs_type
= glsl_type::get_instance(var
->type
->base_type
,
806 ir_rvalue
*rhs
= new(ctx
) ir_constant(rhs_type
, &data
);
808 ir_instruction
*inst
=
809 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, constant_mask
);
810 instructions
->push_tail(inst
);
814 foreach_list(node
, parameters
) {
815 ir_rvalue
*param
= (ir_rvalue
*) node
;
816 unsigned rhs_components
= param
->type
->components();
818 /* Do not try to assign more components to the vector than it has!
820 if ((rhs_components
+ base_component
) > lhs_components
) {
821 rhs_components
= lhs_components
- base_component
;
824 const ir_constant
*const c
= param
->as_constant();
826 /* Mask of fields to be written in the assignment.
828 const unsigned write_mask
= ((1U << rhs_components
) - 1)
831 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
833 /* Generate a swizzle so that LHS and RHS sizes match.
836 new(ctx
) ir_swizzle(param
, 0, 1, 2, 3, rhs_components
);
838 ir_instruction
*inst
=
839 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, write_mask
);
840 instructions
->push_tail(inst
);
843 /* Advance the component index by the number of components that were
846 base_component
+= rhs_components
;
849 return new(ctx
) ir_dereference_variable(var
);
854 * Generate assignment of a portion of a vector to a portion of a matrix column
856 * \param src_base First component of the source to be used in assignment
857 * \param column Column of destination to be assiged
858 * \param row_base First component of the destination column to be assigned
859 * \param count Number of components to be assigned
862 * \c src_base + \c count must be less than or equal to the number of components
863 * in the source vector.
866 assign_to_matrix_column(ir_variable
*var
, unsigned column
, unsigned row_base
,
867 ir_rvalue
*src
, unsigned src_base
, unsigned count
,
870 ir_constant
*col_idx
= new(mem_ctx
) ir_constant(column
);
871 ir_dereference
*column_ref
= new(mem_ctx
) ir_dereference_array(var
, col_idx
);
873 assert(column_ref
->type
->components() >= (row_base
+ count
));
874 assert(src
->type
->components() >= (src_base
+ count
));
876 /* Generate a swizzle that extracts the number of components from the source
877 * that are to be assigned to the column of the matrix.
879 if (count
< src
->type
->vector_elements
) {
880 src
= new(mem_ctx
) ir_swizzle(src
,
881 src_base
+ 0, src_base
+ 1,
882 src_base
+ 2, src_base
+ 3,
886 /* Mask of fields to be written in the assignment.
888 const unsigned write_mask
= ((1U << count
) - 1) << row_base
;
890 return new(mem_ctx
) ir_assignment(column_ref
, src
, NULL
, write_mask
);
895 * Generate inline code for a matrix constructor
897 * The generated constructor code will consist of a temporary variable
898 * declaration of the same type as the constructor. A sequence of assignments
899 * from constructor parameters to the temporary will follow.
902 * An \c ir_dereference_variable of the temprorary generated in the constructor
906 emit_inline_matrix_constructor(const glsl_type
*type
,
907 exec_list
*instructions
,
908 exec_list
*parameters
,
911 assert(!parameters
->is_empty());
913 ir_variable
*var
= new(ctx
) ir_variable(type
, "mat_ctor", ir_var_temporary
);
914 instructions
->push_tail(var
);
916 /* There are three kinds of matrix constructors.
918 * - Construct a matrix from a single scalar by replicating that scalar to
919 * along the diagonal of the matrix and setting all other components to
922 * - Construct a matrix from an arbirary combination of vectors and
923 * scalars. The components of the constructor parameters are assigned
924 * to the matrix in colum-major order until the matrix is full.
926 * - Construct a matrix from a single matrix. The source matrix is copied
927 * to the upper left portion of the constructed matrix, and the remaining
928 * elements take values from the identity matrix.
930 ir_rvalue
*const first_param
= (ir_rvalue
*) parameters
->head
;
931 if (single_scalar_parameter(parameters
)) {
932 /* Assign the scalar to the X component of a vec4, and fill the remaining
933 * components with zero.
935 ir_variable
*rhs_var
=
936 new(ctx
) ir_variable(glsl_type::vec4_type
, "mat_ctor_vec",
938 instructions
->push_tail(rhs_var
);
940 ir_constant_data zero
;
946 ir_instruction
*inst
=
947 new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(rhs_var
),
948 new(ctx
) ir_constant(rhs_var
->type
, &zero
),
950 instructions
->push_tail(inst
);
952 ir_dereference
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
954 inst
= new(ctx
) ir_assignment(rhs_ref
, first_param
, NULL
, 0x01);
955 instructions
->push_tail(inst
);
957 /* Assign the temporary vector to each column of the destination matrix
958 * with a swizzle that puts the X component on the diagonal of the
959 * matrix. In some cases this may mean that the X component does not
960 * get assigned into the column at all (i.e., when the matrix has more
961 * columns than rows).
963 static const unsigned rhs_swiz
[4][4] = {
970 const unsigned cols_to_init
= MIN2(type
->matrix_columns
,
971 type
->vector_elements
);
972 for (unsigned i
= 0; i
< cols_to_init
; i
++) {
973 ir_constant
*const col_idx
= new(ctx
) ir_constant(i
);
974 ir_rvalue
*const col_ref
= new(ctx
) ir_dereference_array(var
, col_idx
);
976 ir_rvalue
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
977 ir_rvalue
*const rhs
= new(ctx
) ir_swizzle(rhs_ref
, rhs_swiz
[i
],
978 type
->vector_elements
);
980 inst
= new(ctx
) ir_assignment(col_ref
, rhs
, NULL
);
981 instructions
->push_tail(inst
);
984 for (unsigned i
= cols_to_init
; i
< type
->matrix_columns
; i
++) {
985 ir_constant
*const col_idx
= new(ctx
) ir_constant(i
);
986 ir_rvalue
*const col_ref
= new(ctx
) ir_dereference_array(var
, col_idx
);
988 ir_rvalue
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
989 ir_rvalue
*const rhs
= new(ctx
) ir_swizzle(rhs_ref
, 1, 1, 1, 1,
990 type
->vector_elements
);
992 inst
= new(ctx
) ir_assignment(col_ref
, rhs
, NULL
);
993 instructions
->push_tail(inst
);
995 } else if (first_param
->type
->is_matrix()) {
996 /* From page 50 (56 of the PDF) of the GLSL 1.50 spec:
998 * "If a matrix is constructed from a matrix, then each component
999 * (column i, row j) in the result that has a corresponding
1000 * component (column i, row j) in the argument will be initialized
1001 * from there. All other components will be initialized to the
1002 * identity matrix. If a matrix argument is given to a matrix
1003 * constructor, it is an error to have any other arguments."
1005 assert(first_param
->next
->is_tail_sentinel());
1006 ir_rvalue
*const src_matrix
= first_param
;
1008 /* If the source matrix is smaller, pre-initialize the relavent parts of
1009 * the destination matrix to the identity matrix.
1011 if ((src_matrix
->type
->matrix_columns
< var
->type
->matrix_columns
)
1012 || (src_matrix
->type
->vector_elements
< var
->type
->vector_elements
)) {
1014 /* If the source matrix has fewer rows, every column of the destination
1015 * must be initialized. Otherwise only the columns in the destination
1016 * that do not exist in the source must be initialized.
1019 (src_matrix
->type
->vector_elements
< var
->type
->vector_elements
)
1020 ? 0 : src_matrix
->type
->matrix_columns
;
1022 const glsl_type
*const col_type
= var
->type
->column_type();
1023 for (/* empty */; col
< var
->type
->matrix_columns
; col
++) {
1024 ir_constant_data ident
;
1033 ir_rvalue
*const rhs
= new(ctx
) ir_constant(col_type
, &ident
);
1035 ir_rvalue
*const lhs
=
1036 new(ctx
) ir_dereference_array(var
, new(ctx
) ir_constant(col
));
1038 ir_instruction
*inst
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
1039 instructions
->push_tail(inst
);
1043 /* Assign columns from the source matrix to the destination matrix.
1045 * Since the parameter will be used in the RHS of multiple assignments,
1046 * generate a temporary and copy the paramter there.
1048 ir_variable
*const rhs_var
=
1049 new(ctx
) ir_variable(first_param
->type
, "mat_ctor_mat",
1051 instructions
->push_tail(rhs_var
);
1053 ir_dereference
*const rhs_var_ref
=
1054 new(ctx
) ir_dereference_variable(rhs_var
);
1055 ir_instruction
*const inst
=
1056 new(ctx
) ir_assignment(rhs_var_ref
, first_param
, NULL
);
1057 instructions
->push_tail(inst
);
1059 const unsigned last_row
= MIN2(src_matrix
->type
->vector_elements
,
1060 var
->type
->vector_elements
);
1061 const unsigned last_col
= MIN2(src_matrix
->type
->matrix_columns
,
1062 var
->type
->matrix_columns
);
1064 unsigned swiz
[4] = { 0, 0, 0, 0 };
1065 for (unsigned i
= 1; i
< last_row
; i
++)
1068 const unsigned write_mask
= (1U << last_row
) - 1;
1070 for (unsigned i
= 0; i
< last_col
; i
++) {
1071 ir_dereference
*const lhs
=
1072 new(ctx
) ir_dereference_array(var
, new(ctx
) ir_constant(i
));
1073 ir_rvalue
*const rhs_col
=
1074 new(ctx
) ir_dereference_array(rhs_var
, new(ctx
) ir_constant(i
));
1076 /* If one matrix has columns that are smaller than the columns of the
1077 * other matrix, wrap the column access of the larger with a swizzle
1078 * so that the LHS and RHS of the assignment have the same size (and
1079 * therefore have the same type).
1081 * It would be perfectly valid to unconditionally generate the
1082 * swizzles, this this will typically result in a more compact IR tree.
1085 if (lhs
->type
->vector_elements
!= rhs_col
->type
->vector_elements
) {
1086 rhs
= new(ctx
) ir_swizzle(rhs_col
, swiz
, last_row
);
1091 ir_instruction
*inst
=
1092 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, write_mask
);
1093 instructions
->push_tail(inst
);
1096 const unsigned cols
= type
->matrix_columns
;
1097 const unsigned rows
= type
->vector_elements
;
1098 unsigned col_idx
= 0;
1099 unsigned row_idx
= 0;
1101 foreach_list (node
, parameters
) {
1102 ir_rvalue
*const rhs
= (ir_rvalue
*) node
;
1103 const unsigned components_remaining_this_column
= rows
- row_idx
;
1104 unsigned rhs_components
= rhs
->type
->components();
1105 unsigned rhs_base
= 0;
1107 /* Since the parameter might be used in the RHS of two assignments,
1108 * generate a temporary and copy the paramter there.
1110 ir_variable
*rhs_var
=
1111 new(ctx
) ir_variable(rhs
->type
, "mat_ctor_vec", ir_var_temporary
);
1112 instructions
->push_tail(rhs_var
);
1114 ir_dereference
*rhs_var_ref
=
1115 new(ctx
) ir_dereference_variable(rhs_var
);
1116 ir_instruction
*inst
= new(ctx
) ir_assignment(rhs_var_ref
, rhs
, NULL
);
1117 instructions
->push_tail(inst
);
1119 /* Assign the current parameter to as many components of the matrix
1122 * NOTE: A single vector parameter can span two matrix columns. A
1123 * single vec4, for example, can completely fill a mat2.
1125 if (rhs_components
>= components_remaining_this_column
) {
1126 const unsigned count
= MIN2(rhs_components
,
1127 components_remaining_this_column
);
1129 rhs_var_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1131 ir_instruction
*inst
= assign_to_matrix_column(var
, col_idx
,
1135 instructions
->push_tail(inst
);
1143 /* If there is data left in the parameter and components left to be
1144 * set in the destination, emit another assignment. It is possible
1145 * that the assignment could be of a vec4 to the last element of the
1146 * matrix. In this case col_idx==cols, but there is still data
1147 * left in the source parameter. Obviously, don't emit an assignment
1148 * to data outside the destination matrix.
1150 if ((col_idx
< cols
) && (rhs_base
< rhs_components
)) {
1151 const unsigned count
= rhs_components
- rhs_base
;
1153 rhs_var_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1155 ir_instruction
*inst
= assign_to_matrix_column(var
, col_idx
,
1160 instructions
->push_tail(inst
);
1167 return new(ctx
) ir_dereference_variable(var
);
1172 emit_inline_record_constructor(const glsl_type
*type
,
1173 exec_list
*instructions
,
1174 exec_list
*parameters
,
1177 ir_variable
*const var
=
1178 new(mem_ctx
) ir_variable(type
, "record_ctor", ir_var_temporary
);
1179 ir_dereference_variable
*const d
= new(mem_ctx
) ir_dereference_variable(var
);
1181 instructions
->push_tail(var
);
1183 exec_node
*node
= parameters
->head
;
1184 for (unsigned i
= 0; i
< type
->length
; i
++) {
1185 assert(!node
->is_tail_sentinel());
1187 ir_dereference
*const lhs
=
1188 new(mem_ctx
) ir_dereference_record(d
->clone(mem_ctx
, NULL
),
1189 type
->fields
.structure
[i
].name
);
1191 ir_rvalue
*const rhs
= ((ir_instruction
*) node
)->as_rvalue();
1192 assert(rhs
!= NULL
);
1194 ir_instruction
*const assign
= new(mem_ctx
) ir_assignment(lhs
, rhs
, NULL
);
1196 instructions
->push_tail(assign
);
1205 ast_function_expression::hir(exec_list
*instructions
,
1206 struct _mesa_glsl_parse_state
*state
)
1209 /* There are three sorts of function calls.
1211 * 1. constructors - The first subexpression is an ast_type_specifier.
1212 * 2. methods - Only the .length() method of array types.
1213 * 3. functions - Calls to regular old functions.
1215 * Method calls are actually detected when the ast_field_selection
1216 * expression is handled.
1218 if (is_constructor()) {
1219 const ast_type_specifier
*type
= (ast_type_specifier
*) subexpressions
[0];
1220 YYLTYPE loc
= type
->get_location();
1223 const glsl_type
*const constructor_type
= type
->glsl_type(& name
, state
);
1225 /* constructor_type can be NULL if a variable with the same name as the
1226 * structure has come into scope.
1228 if (constructor_type
== NULL
) {
1229 _mesa_glsl_error(& loc
, state
, "unknown type `%s' (structure name "
1230 "may be shadowed by a variable with the same name)",
1232 return ir_rvalue::error_value(ctx
);
1236 /* Constructors for samplers are illegal.
1238 if (constructor_type
->is_sampler()) {
1239 _mesa_glsl_error(& loc
, state
, "cannot construct sampler type `%s'",
1240 constructor_type
->name
);
1241 return ir_rvalue::error_value(ctx
);
1244 if (constructor_type
->is_array()) {
1245 if (state
->language_version
<= 110) {
1246 _mesa_glsl_error(& loc
, state
,
1247 "array constructors forbidden in GLSL 1.10");
1248 return ir_rvalue::error_value(ctx
);
1251 return process_array_constructor(instructions
, constructor_type
,
1252 & loc
, &this->expressions
, state
);
1256 /* There are two kinds of constructor call. Constructors for built-in
1257 * language types, such as mat4 and vec2, are free form. The only
1258 * requirement is that the parameters must provide enough values of the
1259 * correct scalar type. Constructors for arrays and structures must
1260 * have the exact number of parameters with matching types in the
1261 * correct order. These constructors follow essentially the same type
1262 * matching rules as functions.
1264 if (constructor_type
->is_record()) {
1265 exec_list actual_parameters
;
1267 process_parameters(instructions
, &actual_parameters
,
1268 &this->expressions
, state
);
1270 exec_node
*node
= actual_parameters
.head
;
1271 for (unsigned i
= 0; i
< constructor_type
->length
; i
++) {
1272 ir_rvalue
*ir
= (ir_rvalue
*) node
;
1274 if (node
->is_tail_sentinel()) {
1275 _mesa_glsl_error(&loc
, state
,
1276 "insufficient parameters to constructor "
1278 constructor_type
->name
);
1279 return ir_rvalue::error_value(ctx
);
1282 if (apply_implicit_conversion(constructor_type
->fields
.structure
[i
].type
,
1284 node
->replace_with(ir
);
1286 _mesa_glsl_error(&loc
, state
,
1287 "parameter type mismatch in constructor "
1288 "for `%s.%s' (%s vs %s)",
1289 constructor_type
->name
,
1290 constructor_type
->fields
.structure
[i
].name
,
1292 constructor_type
->fields
.structure
[i
].type
->name
);
1293 return ir_rvalue::error_value(ctx
);;
1299 if (!node
->is_tail_sentinel()) {
1300 _mesa_glsl_error(&loc
, state
, "too many parameters in constructor "
1301 "for `%s'", constructor_type
->name
);
1302 return ir_rvalue::error_value(ctx
);
1305 ir_rvalue
*const constant
=
1306 constant_record_constructor(constructor_type
, &actual_parameters
,
1309 return (constant
!= NULL
)
1311 : emit_inline_record_constructor(constructor_type
, instructions
,
1312 &actual_parameters
, state
);
1315 if (!constructor_type
->is_numeric() && !constructor_type
->is_boolean())
1316 return ir_rvalue::error_value(ctx
);
1318 /* Total number of components of the type being constructed. */
1319 const unsigned type_components
= constructor_type
->components();
1321 /* Number of components from parameters that have actually been
1322 * consumed. This is used to perform several kinds of error checking.
1324 unsigned components_used
= 0;
1326 unsigned matrix_parameters
= 0;
1327 unsigned nonmatrix_parameters
= 0;
1328 exec_list actual_parameters
;
1330 foreach_list (n
, &this->expressions
) {
1331 ast_node
*ast
= exec_node_data(ast_node
, n
, link
);
1332 ir_rvalue
*result
= ast
->hir(instructions
, state
)->as_rvalue();
1334 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
1336 * "It is an error to provide extra arguments beyond this
1337 * last used argument."
1339 if (components_used
>= type_components
) {
1340 _mesa_glsl_error(& loc
, state
, "too many parameters to `%s' "
1342 constructor_type
->name
);
1343 return ir_rvalue::error_value(ctx
);
1346 if (!result
->type
->is_numeric() && !result
->type
->is_boolean()) {
1347 _mesa_glsl_error(& loc
, state
, "cannot construct `%s' from a "
1348 "non-numeric data type",
1349 constructor_type
->name
);
1350 return ir_rvalue::error_value(ctx
);
1353 /* Count the number of matrix and nonmatrix parameters. This
1354 * is used below to enforce some of the constructor rules.
1356 if (result
->type
->is_matrix())
1357 matrix_parameters
++;
1359 nonmatrix_parameters
++;
1361 actual_parameters
.push_tail(result
);
1362 components_used
+= result
->type
->components();
1365 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
1367 * "It is an error to construct matrices from other matrices. This
1368 * is reserved for future use."
1370 if (state
->language_version
== 110 && matrix_parameters
> 0
1371 && constructor_type
->is_matrix()) {
1372 _mesa_glsl_error(& loc
, state
, "cannot construct `%s' from a "
1373 "matrix in GLSL 1.10",
1374 constructor_type
->name
);
1375 return ir_rvalue::error_value(ctx
);
1378 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
1380 * "If a matrix argument is given to a matrix constructor, it is
1381 * an error to have any other arguments."
1383 if ((matrix_parameters
> 0)
1384 && ((matrix_parameters
+ nonmatrix_parameters
) > 1)
1385 && constructor_type
->is_matrix()) {
1386 _mesa_glsl_error(& loc
, state
, "for matrix `%s' constructor, "
1387 "matrix must be only parameter",
1388 constructor_type
->name
);
1389 return ir_rvalue::error_value(ctx
);
1392 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
1394 * "In these cases, there must be enough components provided in the
1395 * arguments to provide an initializer for every component in the
1396 * constructed value."
1398 if (components_used
< type_components
&& components_used
!= 1
1399 && matrix_parameters
== 0) {
1400 _mesa_glsl_error(& loc
, state
, "too few components to construct "
1402 constructor_type
->name
);
1403 return ir_rvalue::error_value(ctx
);
1406 /* Later, we cast each parameter to the same base type as the
1407 * constructor. Since there are no non-floating point matrices, we
1408 * need to break them up into a series of column vectors.
1410 if (constructor_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1411 foreach_list_safe(n
, &actual_parameters
) {
1412 ir_rvalue
*matrix
= (ir_rvalue
*) n
;
1414 if (!matrix
->type
->is_matrix())
1417 /* Create a temporary containing the matrix. */
1418 ir_variable
*var
= new(ctx
) ir_variable(matrix
->type
, "matrix_tmp",
1420 instructions
->push_tail(var
);
1421 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
)
1422 ir_dereference_variable(var
), matrix
, NULL
));
1423 var
->constant_value
= matrix
->constant_expression_value();
1425 /* Replace the matrix with dereferences of its columns. */
1426 for (int i
= 0; i
< matrix
->type
->matrix_columns
; i
++) {
1427 matrix
->insert_before(new (ctx
) ir_dereference_array(var
,
1428 new(ctx
) ir_constant(i
)));
1434 bool all_parameters_are_constant
= true;
1436 /* Type cast each parameter and, if possible, fold constants.*/
1437 foreach_list_safe(n
, &actual_parameters
) {
1438 ir_rvalue
*ir
= (ir_rvalue
*) n
;
1440 const glsl_type
*desired_type
=
1441 glsl_type::get_instance(constructor_type
->base_type
,
1442 ir
->type
->vector_elements
,
1443 ir
->type
->matrix_columns
);
1444 ir_rvalue
*result
= convert_component(ir
, desired_type
);
1446 /* Attempt to convert the parameter to a constant valued expression.
1447 * After doing so, track whether or not all the parameters to the
1448 * constructor are trivially constant valued expressions.
1450 ir_rvalue
*const constant
= result
->constant_expression_value();
1452 if (constant
!= NULL
)
1455 all_parameters_are_constant
= false;
1458 ir
->replace_with(result
);
1462 /* If all of the parameters are trivially constant, create a
1463 * constant representing the complete collection of parameters.
1465 if (all_parameters_are_constant
) {
1466 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
1467 } else if (constructor_type
->is_scalar()) {
1468 return dereference_component((ir_rvalue
*) actual_parameters
.head
,
1470 } else if (constructor_type
->is_vector()) {
1471 return emit_inline_vector_constructor(constructor_type
,
1476 assert(constructor_type
->is_matrix());
1477 return emit_inline_matrix_constructor(constructor_type
,
1483 const ast_expression
*id
= subexpressions
[0];
1484 const char *func_name
= id
->primary_expression
.identifier
;
1485 YYLTYPE loc
= id
->get_location();
1486 exec_list actual_parameters
;
1488 process_parameters(instructions
, &actual_parameters
, &this->expressions
,
1491 ir_function_signature
*sig
=
1492 match_function_by_name(func_name
, &actual_parameters
, state
);
1494 ir_call
*call
= NULL
;
1495 ir_rvalue
*value
= NULL
;
1497 no_matching_function_error(func_name
, &loc
, &actual_parameters
, state
);
1498 value
= ir_rvalue::error_value(ctx
);
1499 } else if (!verify_parameter_modes(state
, sig
, actual_parameters
, this->expressions
)) {
1500 /* an error has already been emitted */
1501 value
= ir_rvalue::error_value(ctx
);
1503 value
= generate_call(instructions
, sig
, &loc
, &actual_parameters
,
1510 return ir_rvalue::error_value(ctx
);