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_instruction
*const param
= (ir_instruction
*) 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 if (actual
->variable_referenced()
156 && actual
->variable_referenced()->read_only
) {
157 _mesa_glsl_error(&loc
, state
,
158 "function parameter '%s %s' references the "
159 "read-only variable '%s'",
161 actual
->variable_referenced()->name
);
163 } else if (!actual
->is_lvalue()) {
164 _mesa_glsl_error(&loc
, state
,
165 "function parameter '%s %s' is not an lvalue",
171 actual_ir_node
= actual_ir_node
->next
;
172 actual_ast_node
= actual_ast_node
->next
;
178 * If a function call is generated, \c call_ir will point to it on exit.
179 * Otherwise \c call_ir will be set to \c NULL.
182 generate_call(exec_list
*instructions
, ir_function_signature
*sig
,
183 YYLTYPE
*loc
, exec_list
*actual_parameters
,
185 struct _mesa_glsl_parse_state
*state
)
188 exec_list post_call_conversions
;
192 /* Perform implicit conversion of arguments. For out parameters, we need
193 * to place them in a temporary variable and do the conversion after the
194 * call takes place. Since we haven't emitted the call yet, we'll place
195 * the post-call conversions in a temporary exec_list, and emit them later.
197 exec_list_iterator actual_iter
= actual_parameters
->iterator();
198 exec_list_iterator formal_iter
= sig
->parameters
.iterator();
200 while (actual_iter
.has_next()) {
201 ir_rvalue
*actual
= (ir_rvalue
*) actual_iter
.get();
202 ir_variable
*formal
= (ir_variable
*) formal_iter
.get();
204 assert(actual
!= NULL
);
205 assert(formal
!= NULL
);
207 if (formal
->type
->is_numeric() || formal
->type
->is_boolean()) {
208 switch (formal
->mode
) {
209 case ir_var_const_in
:
212 = convert_component(actual
, formal
->type
);
213 actual
->replace_with(converted
);
217 if (actual
->type
!= formal
->type
) {
218 /* To convert an out parameter, we need to create a
219 * temporary variable to hold the value before conversion,
220 * and then perform the conversion after the function call
223 * This has the effect of transforming code like this:
229 * Into IR that's equivalent to this:
233 * int out_parameter_conversion;
234 * f(out_parameter_conversion);
235 * value = float(out_parameter_conversion);
238 new(ctx
) ir_variable(formal
->type
,
239 "out_parameter_conversion",
241 instructions
->push_tail(tmp
);
242 ir_dereference_variable
*deref_tmp_1
243 = new(ctx
) ir_dereference_variable(tmp
);
244 ir_dereference_variable
*deref_tmp_2
245 = new(ctx
) ir_dereference_variable(tmp
);
246 ir_rvalue
*converted_tmp
247 = convert_component(deref_tmp_1
, actual
->type
);
248 ir_assignment
*assignment
249 = new(ctx
) ir_assignment(actual
, converted_tmp
);
250 post_call_conversions
.push_tail(assignment
);
251 actual
->replace_with(deref_tmp_2
);
255 /* Inout parameters should never require conversion, since that
256 * would require an implicit conversion to exist both to and
257 * from the formal parameter type, and there are no
258 * bidirectional implicit conversions.
260 assert (actual
->type
== formal
->type
);
263 assert (!"Illegal formal parameter mode");
272 /* Always insert the call in the instruction stream, and return a deref
273 * of its return val if it returns a value, since we don't know if
274 * the rvalue is going to be assigned to anything or not.
276 * Also insert any out parameter conversions after the call.
278 ir_call
*call
= new(ctx
) ir_call(sig
, actual_parameters
);
279 ir_dereference_variable
*deref
;
280 if (!sig
->return_type
->is_void()) {
281 /* If the function call is a constant expression, don't
282 * generate the instructions to call it; just generate an
283 * ir_constant representing the constant value.
285 * Function calls can only be constant expressions starting
288 if (state
->language_version
>= 120) {
289 ir_constant
*const_val
= call
->constant_expression_value();
297 var
= new(ctx
) ir_variable(sig
->return_type
,
298 ralloc_asprintf(ctx
, "%s_retval",
299 sig
->function_name()),
301 instructions
->push_tail(var
);
303 deref
= new(ctx
) ir_dereference_variable(var
);
304 ir_assignment
*assign
= new(ctx
) ir_assignment(deref
, call
, NULL
);
305 instructions
->push_tail(assign
);
308 deref
= new(ctx
) ir_dereference_variable(var
);
310 instructions
->push_tail(call
);
314 instructions
->append_list(&post_call_conversions
);
319 * Given a function name and parameter list, find the matching signature.
321 static ir_function_signature
*
322 match_function_by_name(const char *name
,
323 exec_list
*actual_parameters
,
324 struct _mesa_glsl_parse_state
*state
)
327 ir_function
*f
= state
->symbols
->get_function(name
);
328 ir_function_signature
*local_sig
= NULL
;
329 ir_function_signature
*sig
= NULL
;
331 /* Is the function hidden by a record type constructor? */
332 if (state
->symbols
->get_type(name
))
333 goto done
; /* no match */
335 /* Is the function hidden by a variable (impossible in 1.10)? */
336 if (state
->language_version
!= 110 && state
->symbols
->get_variable(name
))
337 goto done
; /* no match */
340 /* Look for a match in the local shader. If exact, we're done. */
341 bool is_exact
= false;
342 sig
= local_sig
= f
->matching_signature(actual_parameters
, &is_exact
);
346 if (!state
->es_shader
&& f
->has_user_signature()) {
347 /* In desktop GL, the presence of a user-defined signature hides any
348 * built-in signatures, so we must ignore them. In contrast, in ES2
349 * user-defined signatures add new overloads, so we must proceed.
355 /* Local shader has no exact candidates; check the built-ins. */
356 _mesa_glsl_initialize_functions(state
);
357 for (unsigned i
= 0; i
< state
->num_builtins_to_link
; i
++) {
358 ir_function
*builtin
=
359 state
->builtins_to_link
[i
]->symbols
->get_function(name
);
363 bool is_exact
= false;
364 ir_function_signature
*builtin_sig
=
365 builtin
->matching_signature(actual_parameters
, &is_exact
);
367 if (builtin_sig
== NULL
)
370 /* If the built-in signature is exact, we can stop. */
377 /* We found an inexact match, which is better than nothing. However,
378 * we should keep searching for an exact match.
386 /* If the match is from a linked built-in shader, import the prototype. */
387 if (sig
!= local_sig
) {
389 f
= new(ctx
) ir_function(name
);
390 state
->symbols
->add_global_function(f
);
391 emit_function(state
, f
);
393 f
->add_signature(sig
->clone_prototype(f
, NULL
));
400 * Raise a "no matching function" error, listing all possible overloads the
401 * compiler considered so developers can figure out what went wrong.
404 no_matching_function_error(const char *name
,
406 exec_list
*actual_parameters
,
407 _mesa_glsl_parse_state
*state
)
409 char *str
= prototype_string(NULL
, name
, actual_parameters
);
410 _mesa_glsl_error(loc
, state
, "no matching function for call to `%s'", str
);
413 const char *prefix
= "candidates are: ";
415 for (int i
= -1; i
< (int) state
->num_builtins_to_link
; i
++) {
416 glsl_symbol_table
*syms
= i
>= 0 ? state
->builtins_to_link
[i
]->symbols
418 ir_function
*f
= syms
->get_function(name
);
422 foreach_list (node
, &f
->signatures
) {
423 ir_function_signature
*sig
= (ir_function_signature
*) node
;
425 str
= prototype_string(sig
->return_type
, f
->name
, &sig
->parameters
);
426 _mesa_glsl_error(loc
, state
, "%s%s", prefix
, str
);
435 * Perform automatic type conversion of constructor parameters
437 * This implements the rules in the "Conversion and Scalar Constructors"
438 * section (GLSL 1.10 section 5.4.1), not the "Implicit Conversions" rules.
441 convert_component(ir_rvalue
*src
, const glsl_type
*desired_type
)
443 void *ctx
= ralloc_parent(src
);
444 const unsigned a
= desired_type
->base_type
;
445 const unsigned b
= src
->type
->base_type
;
446 ir_expression
*result
= NULL
;
448 if (src
->type
->is_error())
451 assert(a
<= GLSL_TYPE_BOOL
);
452 assert(b
<= GLSL_TYPE_BOOL
);
461 result
= new(ctx
) ir_expression(ir_unop_i2u
, src
);
463 case GLSL_TYPE_FLOAT
:
464 result
= new(ctx
) ir_expression(ir_unop_i2u
,
465 new(ctx
) ir_expression(ir_unop_f2i
, src
));
468 result
= new(ctx
) ir_expression(ir_unop_i2u
,
469 new(ctx
) ir_expression(ir_unop_b2i
, src
));
476 result
= new(ctx
) ir_expression(ir_unop_u2i
, src
);
478 case GLSL_TYPE_FLOAT
:
479 result
= new(ctx
) ir_expression(ir_unop_f2i
, src
);
482 result
= new(ctx
) ir_expression(ir_unop_b2i
, src
);
486 case GLSL_TYPE_FLOAT
:
489 result
= new(ctx
) ir_expression(ir_unop_u2f
, desired_type
, src
, NULL
);
492 result
= new(ctx
) ir_expression(ir_unop_i2f
, desired_type
, src
, NULL
);
495 result
= new(ctx
) ir_expression(ir_unop_b2f
, desired_type
, src
, NULL
);
502 result
= new(ctx
) ir_expression(ir_unop_i2b
,
503 new(ctx
) ir_expression(ir_unop_u2i
, src
));
506 result
= new(ctx
) ir_expression(ir_unop_i2b
, desired_type
, src
, NULL
);
508 case GLSL_TYPE_FLOAT
:
509 result
= new(ctx
) ir_expression(ir_unop_f2b
, desired_type
, src
, NULL
);
515 assert(result
!= NULL
);
516 assert(result
->type
== desired_type
);
518 /* Try constant folding; it may fold in the conversion we just added. */
519 ir_constant
*const constant
= result
->constant_expression_value();
520 return (constant
!= NULL
) ? (ir_rvalue
*) constant
: (ir_rvalue
*) result
;
524 * Dereference a specific component from a scalar, vector, or matrix
527 dereference_component(ir_rvalue
*src
, unsigned component
)
529 void *ctx
= ralloc_parent(src
);
530 assert(component
< src
->type
->components());
532 /* If the source is a constant, just create a new constant instead of a
533 * dereference of the existing constant.
535 ir_constant
*constant
= src
->as_constant();
537 return new(ctx
) ir_constant(constant
, component
);
539 if (src
->type
->is_scalar()) {
541 } else if (src
->type
->is_vector()) {
542 return new(ctx
) ir_swizzle(src
, component
, 0, 0, 0, 1);
544 assert(src
->type
->is_matrix());
546 /* Dereference a row of the matrix, then call this function again to get
547 * a specific element from that row.
549 const int c
= component
/ src
->type
->column_type()->vector_elements
;
550 const int r
= component
% src
->type
->column_type()->vector_elements
;
551 ir_constant
*const col_index
= new(ctx
) ir_constant(c
);
552 ir_dereference
*const col
= new(ctx
) ir_dereference_array(src
, col_index
);
554 col
->type
= src
->type
->column_type();
556 return dereference_component(col
, r
);
559 assert(!"Should not get here.");
565 process_array_constructor(exec_list
*instructions
,
566 const glsl_type
*constructor_type
,
567 YYLTYPE
*loc
, exec_list
*parameters
,
568 struct _mesa_glsl_parse_state
*state
)
571 /* Array constructors come in two forms: sized and unsized. Sized array
572 * constructors look like 'vec4[2](a, b)', where 'a' and 'b' are vec4
573 * variables. In this case the number of parameters must exactly match the
574 * specified size of the array.
576 * Unsized array constructors look like 'vec4[](a, b)', where 'a' and 'b'
577 * are vec4 variables. In this case the size of the array being constructed
578 * is determined by the number of parameters.
580 * From page 52 (page 58 of the PDF) of the GLSL 1.50 spec:
582 * "There must be exactly the same number of arguments as the size of
583 * the array being constructed. If no size is present in the
584 * constructor, then the array is explicitly sized to the number of
585 * arguments provided. The arguments are assigned in order, starting at
586 * element 0, to the elements of the constructed array. Each argument
587 * must be the same type as the element type of the array, or be a type
588 * that can be converted to the element type of the array according to
589 * Section 4.1.10 "Implicit Conversions.""
591 exec_list actual_parameters
;
592 const unsigned parameter_count
=
593 process_parameters(instructions
, &actual_parameters
, parameters
, state
);
595 if ((parameter_count
== 0)
596 || ((constructor_type
->length
!= 0)
597 && (constructor_type
->length
!= parameter_count
))) {
598 const unsigned min_param
= (constructor_type
->length
== 0)
599 ? 1 : constructor_type
->length
;
601 _mesa_glsl_error(loc
, state
, "array constructor must have %s %u "
603 (constructor_type
->length
!= 0) ? "at least" : "exactly",
604 min_param
, (min_param
<= 1) ? "" : "s");
605 return ir_rvalue::error_value(ctx
);
608 if (constructor_type
->length
== 0) {
610 glsl_type::get_array_instance(constructor_type
->element_type(),
612 assert(constructor_type
!= NULL
);
613 assert(constructor_type
->length
== parameter_count
);
616 bool all_parameters_are_constant
= true;
618 /* Type cast each parameter and, if possible, fold constants. */
619 foreach_list_safe(n
, &actual_parameters
) {
620 ir_rvalue
*ir
= (ir_rvalue
*) n
;
621 ir_rvalue
*result
= ir
;
623 /* Apply implicit conversions (not the scalar constructor rules!). See
624 * the spec quote above. */
625 if (constructor_type
->element_type()->is_float()) {
626 const glsl_type
*desired_type
=
627 glsl_type::get_instance(GLSL_TYPE_FLOAT
,
628 ir
->type
->vector_elements
,
629 ir
->type
->matrix_columns
);
630 if (result
->type
->can_implicitly_convert_to(desired_type
)) {
631 /* Even though convert_component() implements the constructor
632 * conversion rules (not the implicit conversion rules), its safe
633 * to use it here because we already checked that the implicit
634 * conversion is legal.
636 result
= convert_component(ir
, desired_type
);
640 if (result
->type
!= constructor_type
->element_type()) {
641 _mesa_glsl_error(loc
, state
, "type error in array constructor: "
642 "expected: %s, found %s",
643 constructor_type
->element_type()->name
,
647 /* Attempt to convert the parameter to a constant valued expression.
648 * After doing so, track whether or not all the parameters to the
649 * constructor are trivially constant valued expressions.
651 ir_rvalue
*const constant
= result
->constant_expression_value();
653 if (constant
!= NULL
)
656 all_parameters_are_constant
= false;
658 ir
->replace_with(result
);
661 if (all_parameters_are_constant
)
662 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
664 ir_variable
*var
= new(ctx
) ir_variable(constructor_type
, "array_ctor",
666 instructions
->push_tail(var
);
669 foreach_list(node
, &actual_parameters
) {
670 ir_rvalue
*rhs
= (ir_rvalue
*) node
;
671 ir_rvalue
*lhs
= new(ctx
) ir_dereference_array(var
,
672 new(ctx
) ir_constant(i
));
674 ir_instruction
*assignment
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
675 instructions
->push_tail(assignment
);
680 return new(ctx
) ir_dereference_variable(var
);
685 * Try to convert a record constructor to a constant expression
688 constant_record_constructor(const glsl_type
*constructor_type
,
689 exec_list
*parameters
, void *mem_ctx
)
691 foreach_list(node
, parameters
) {
692 ir_constant
*constant
= ((ir_instruction
*) node
)->as_constant();
693 if (constant
== NULL
)
695 node
->replace_with(constant
);
698 return new(mem_ctx
) ir_constant(constructor_type
, parameters
);
703 * Determine if a list consists of a single scalar r-value
706 single_scalar_parameter(exec_list
*parameters
)
708 const ir_rvalue
*const p
= (ir_rvalue
*) parameters
->head
;
709 assert(((ir_rvalue
*)p
)->as_rvalue() != NULL
);
711 return (p
->type
->is_scalar() && p
->next
->is_tail_sentinel());
716 * Generate inline code for a vector constructor
718 * The generated constructor code will consist of a temporary variable
719 * declaration of the same type as the constructor. A sequence of assignments
720 * from constructor parameters to the temporary will follow.
723 * An \c ir_dereference_variable of the temprorary generated in the constructor
727 emit_inline_vector_constructor(const glsl_type
*type
,
728 exec_list
*instructions
,
729 exec_list
*parameters
,
732 assert(!parameters
->is_empty());
734 ir_variable
*var
= new(ctx
) ir_variable(type
, "vec_ctor", ir_var_temporary
);
735 instructions
->push_tail(var
);
737 /* There are two kinds of vector constructors.
739 * - Construct a vector from a single scalar by replicating that scalar to
740 * all components of the vector.
742 * - Construct a vector from an arbirary combination of vectors and
743 * scalars. The components of the constructor parameters are assigned
744 * to the vector in order until the vector is full.
746 const unsigned lhs_components
= type
->components();
747 if (single_scalar_parameter(parameters
)) {
748 ir_rvalue
*first_param
= (ir_rvalue
*)parameters
->head
;
749 ir_rvalue
*rhs
= new(ctx
) ir_swizzle(first_param
, 0, 0, 0, 0,
751 ir_dereference_variable
*lhs
= new(ctx
) ir_dereference_variable(var
);
752 const unsigned mask
= (1U << lhs_components
) - 1;
754 assert(rhs
->type
== lhs
->type
);
756 ir_instruction
*inst
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
, mask
);
757 instructions
->push_tail(inst
);
759 unsigned base_component
= 0;
760 unsigned base_lhs_component
= 0;
761 ir_constant_data data
;
762 unsigned constant_mask
= 0, constant_components
= 0;
764 memset(&data
, 0, sizeof(data
));
766 foreach_list(node
, parameters
) {
767 ir_rvalue
*param
= (ir_rvalue
*) node
;
768 unsigned rhs_components
= param
->type
->components();
770 /* Do not try to assign more components to the vector than it has!
772 if ((rhs_components
+ base_lhs_component
) > lhs_components
) {
773 rhs_components
= lhs_components
- base_lhs_component
;
776 const ir_constant
*const c
= param
->as_constant();
778 for (unsigned i
= 0; i
< rhs_components
; i
++) {
779 switch (c
->type
->base_type
) {
781 data
.u
[i
+ base_component
] = c
->get_uint_component(i
);
784 data
.i
[i
+ base_component
] = c
->get_int_component(i
);
786 case GLSL_TYPE_FLOAT
:
787 data
.f
[i
+ base_component
] = c
->get_float_component(i
);
790 data
.b
[i
+ base_component
] = c
->get_bool_component(i
);
793 assert(!"Should not get here.");
798 /* Mask of fields to be written in the assignment.
800 constant_mask
|= ((1U << rhs_components
) - 1) << base_lhs_component
;
801 constant_components
+= rhs_components
;
803 base_component
+= rhs_components
;
805 /* Advance the component index by the number of components
806 * that were just assigned.
808 base_lhs_component
+= rhs_components
;
811 if (constant_mask
!= 0) {
812 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
813 const glsl_type
*rhs_type
= glsl_type::get_instance(var
->type
->base_type
,
816 ir_rvalue
*rhs
= new(ctx
) ir_constant(rhs_type
, &data
);
818 ir_instruction
*inst
=
819 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, constant_mask
);
820 instructions
->push_tail(inst
);
824 foreach_list(node
, parameters
) {
825 ir_rvalue
*param
= (ir_rvalue
*) node
;
826 unsigned rhs_components
= param
->type
->components();
828 /* Do not try to assign more components to the vector than it has!
830 if ((rhs_components
+ base_component
) > lhs_components
) {
831 rhs_components
= lhs_components
- base_component
;
834 const ir_constant
*const c
= param
->as_constant();
836 /* Mask of fields to be written in the assignment.
838 const unsigned write_mask
= ((1U << rhs_components
) - 1)
841 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
843 /* Generate a swizzle so that LHS and RHS sizes match.
846 new(ctx
) ir_swizzle(param
, 0, 1, 2, 3, rhs_components
);
848 ir_instruction
*inst
=
849 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, write_mask
);
850 instructions
->push_tail(inst
);
853 /* Advance the component index by the number of components that were
856 base_component
+= rhs_components
;
859 return new(ctx
) ir_dereference_variable(var
);
864 * Generate assignment of a portion of a vector to a portion of a matrix column
866 * \param src_base First component of the source to be used in assignment
867 * \param column Column of destination to be assiged
868 * \param row_base First component of the destination column to be assigned
869 * \param count Number of components to be assigned
872 * \c src_base + \c count must be less than or equal to the number of components
873 * in the source vector.
876 assign_to_matrix_column(ir_variable
*var
, unsigned column
, unsigned row_base
,
877 ir_rvalue
*src
, unsigned src_base
, unsigned count
,
880 ir_constant
*col_idx
= new(mem_ctx
) ir_constant(column
);
881 ir_dereference
*column_ref
= new(mem_ctx
) ir_dereference_array(var
, col_idx
);
883 assert(column_ref
->type
->components() >= (row_base
+ count
));
884 assert(src
->type
->components() >= (src_base
+ count
));
886 /* Generate a swizzle that extracts the number of components from the source
887 * that are to be assigned to the column of the matrix.
889 if (count
< src
->type
->vector_elements
) {
890 src
= new(mem_ctx
) ir_swizzle(src
,
891 src_base
+ 0, src_base
+ 1,
892 src_base
+ 2, src_base
+ 3,
896 /* Mask of fields to be written in the assignment.
898 const unsigned write_mask
= ((1U << count
) - 1) << row_base
;
900 return new(mem_ctx
) ir_assignment(column_ref
, src
, NULL
, write_mask
);
905 * Generate inline code for a matrix constructor
907 * The generated constructor code will consist of a temporary variable
908 * declaration of the same type as the constructor. A sequence of assignments
909 * from constructor parameters to the temporary will follow.
912 * An \c ir_dereference_variable of the temprorary generated in the constructor
916 emit_inline_matrix_constructor(const glsl_type
*type
,
917 exec_list
*instructions
,
918 exec_list
*parameters
,
921 assert(!parameters
->is_empty());
923 ir_variable
*var
= new(ctx
) ir_variable(type
, "mat_ctor", ir_var_temporary
);
924 instructions
->push_tail(var
);
926 /* There are three kinds of matrix constructors.
928 * - Construct a matrix from a single scalar by replicating that scalar to
929 * along the diagonal of the matrix and setting all other components to
932 * - Construct a matrix from an arbirary combination of vectors and
933 * scalars. The components of the constructor parameters are assigned
934 * to the matrix in colum-major order until the matrix is full.
936 * - Construct a matrix from a single matrix. The source matrix is copied
937 * to the upper left portion of the constructed matrix, and the remaining
938 * elements take values from the identity matrix.
940 ir_rvalue
*const first_param
= (ir_rvalue
*) parameters
->head
;
941 if (single_scalar_parameter(parameters
)) {
942 /* Assign the scalar to the X component of a vec4, and fill the remaining
943 * components with zero.
945 ir_variable
*rhs_var
=
946 new(ctx
) ir_variable(glsl_type::vec4_type
, "mat_ctor_vec",
948 instructions
->push_tail(rhs_var
);
950 ir_constant_data zero
;
956 ir_instruction
*inst
=
957 new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(rhs_var
),
958 new(ctx
) ir_constant(rhs_var
->type
, &zero
),
960 instructions
->push_tail(inst
);
962 ir_dereference
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
964 inst
= new(ctx
) ir_assignment(rhs_ref
, first_param
, NULL
, 0x01);
965 instructions
->push_tail(inst
);
967 /* Assign the temporary vector to each column of the destination matrix
968 * with a swizzle that puts the X component on the diagonal of the
969 * matrix. In some cases this may mean that the X component does not
970 * get assigned into the column at all (i.e., when the matrix has more
971 * columns than rows).
973 static const unsigned rhs_swiz
[4][4] = {
980 const unsigned cols_to_init
= MIN2(type
->matrix_columns
,
981 type
->vector_elements
);
982 for (unsigned i
= 0; i
< cols_to_init
; i
++) {
983 ir_constant
*const col_idx
= new(ctx
) ir_constant(i
);
984 ir_rvalue
*const col_ref
= new(ctx
) ir_dereference_array(var
, col_idx
);
986 ir_rvalue
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
987 ir_rvalue
*const rhs
= new(ctx
) ir_swizzle(rhs_ref
, rhs_swiz
[i
],
988 type
->vector_elements
);
990 inst
= new(ctx
) ir_assignment(col_ref
, rhs
, NULL
);
991 instructions
->push_tail(inst
);
994 for (unsigned i
= cols_to_init
; i
< type
->matrix_columns
; i
++) {
995 ir_constant
*const col_idx
= new(ctx
) ir_constant(i
);
996 ir_rvalue
*const col_ref
= new(ctx
) ir_dereference_array(var
, col_idx
);
998 ir_rvalue
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
999 ir_rvalue
*const rhs
= new(ctx
) ir_swizzle(rhs_ref
, 1, 1, 1, 1,
1000 type
->vector_elements
);
1002 inst
= new(ctx
) ir_assignment(col_ref
, rhs
, NULL
);
1003 instructions
->push_tail(inst
);
1005 } else if (first_param
->type
->is_matrix()) {
1006 /* From page 50 (56 of the PDF) of the GLSL 1.50 spec:
1008 * "If a matrix is constructed from a matrix, then each component
1009 * (column i, row j) in the result that has a corresponding
1010 * component (column i, row j) in the argument will be initialized
1011 * from there. All other components will be initialized to the
1012 * identity matrix. If a matrix argument is given to a matrix
1013 * constructor, it is an error to have any other arguments."
1015 assert(first_param
->next
->is_tail_sentinel());
1016 ir_rvalue
*const src_matrix
= first_param
;
1018 /* If the source matrix is smaller, pre-initialize the relavent parts of
1019 * the destination matrix to the identity matrix.
1021 if ((src_matrix
->type
->matrix_columns
< var
->type
->matrix_columns
)
1022 || (src_matrix
->type
->vector_elements
< var
->type
->vector_elements
)) {
1024 /* If the source matrix has fewer rows, every column of the destination
1025 * must be initialized. Otherwise only the columns in the destination
1026 * that do not exist in the source must be initialized.
1029 (src_matrix
->type
->vector_elements
< var
->type
->vector_elements
)
1030 ? 0 : src_matrix
->type
->matrix_columns
;
1032 const glsl_type
*const col_type
= var
->type
->column_type();
1033 for (/* empty */; col
< var
->type
->matrix_columns
; col
++) {
1034 ir_constant_data ident
;
1043 ir_rvalue
*const rhs
= new(ctx
) ir_constant(col_type
, &ident
);
1045 ir_rvalue
*const lhs
=
1046 new(ctx
) ir_dereference_array(var
, new(ctx
) ir_constant(col
));
1048 ir_instruction
*inst
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
1049 instructions
->push_tail(inst
);
1053 /* Assign columns from the source matrix to the destination matrix.
1055 * Since the parameter will be used in the RHS of multiple assignments,
1056 * generate a temporary and copy the paramter there.
1058 ir_variable
*const rhs_var
=
1059 new(ctx
) ir_variable(first_param
->type
, "mat_ctor_mat",
1061 instructions
->push_tail(rhs_var
);
1063 ir_dereference
*const rhs_var_ref
=
1064 new(ctx
) ir_dereference_variable(rhs_var
);
1065 ir_instruction
*const inst
=
1066 new(ctx
) ir_assignment(rhs_var_ref
, first_param
, NULL
);
1067 instructions
->push_tail(inst
);
1069 const unsigned last_row
= MIN2(src_matrix
->type
->vector_elements
,
1070 var
->type
->vector_elements
);
1071 const unsigned last_col
= MIN2(src_matrix
->type
->matrix_columns
,
1072 var
->type
->matrix_columns
);
1074 unsigned swiz
[4] = { 0, 0, 0, 0 };
1075 for (unsigned i
= 1; i
< last_row
; i
++)
1078 const unsigned write_mask
= (1U << last_row
) - 1;
1080 for (unsigned i
= 0; i
< last_col
; i
++) {
1081 ir_dereference
*const lhs
=
1082 new(ctx
) ir_dereference_array(var
, new(ctx
) ir_constant(i
));
1083 ir_rvalue
*const rhs_col
=
1084 new(ctx
) ir_dereference_array(rhs_var
, new(ctx
) ir_constant(i
));
1086 /* If one matrix has columns that are smaller than the columns of the
1087 * other matrix, wrap the column access of the larger with a swizzle
1088 * so that the LHS and RHS of the assignment have the same size (and
1089 * therefore have the same type).
1091 * It would be perfectly valid to unconditionally generate the
1092 * swizzles, this this will typically result in a more compact IR tree.
1095 if (lhs
->type
->vector_elements
!= rhs_col
->type
->vector_elements
) {
1096 rhs
= new(ctx
) ir_swizzle(rhs_col
, swiz
, last_row
);
1101 ir_instruction
*inst
=
1102 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, write_mask
);
1103 instructions
->push_tail(inst
);
1106 const unsigned cols
= type
->matrix_columns
;
1107 const unsigned rows
= type
->vector_elements
;
1108 unsigned col_idx
= 0;
1109 unsigned row_idx
= 0;
1111 foreach_list (node
, parameters
) {
1112 ir_rvalue
*const rhs
= (ir_rvalue
*) node
;
1113 const unsigned components_remaining_this_column
= rows
- row_idx
;
1114 unsigned rhs_components
= rhs
->type
->components();
1115 unsigned rhs_base
= 0;
1117 /* Since the parameter might be used in the RHS of two assignments,
1118 * generate a temporary and copy the paramter there.
1120 ir_variable
*rhs_var
=
1121 new(ctx
) ir_variable(rhs
->type
, "mat_ctor_vec", ir_var_temporary
);
1122 instructions
->push_tail(rhs_var
);
1124 ir_dereference
*rhs_var_ref
=
1125 new(ctx
) ir_dereference_variable(rhs_var
);
1126 ir_instruction
*inst
= new(ctx
) ir_assignment(rhs_var_ref
, rhs
, NULL
);
1127 instructions
->push_tail(inst
);
1129 /* Assign the current parameter to as many components of the matrix
1132 * NOTE: A single vector parameter can span two matrix columns. A
1133 * single vec4, for example, can completely fill a mat2.
1135 if (rhs_components
>= components_remaining_this_column
) {
1136 const unsigned count
= MIN2(rhs_components
,
1137 components_remaining_this_column
);
1139 rhs_var_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1141 ir_instruction
*inst
= assign_to_matrix_column(var
, col_idx
,
1145 instructions
->push_tail(inst
);
1153 /* If there is data left in the parameter and components left to be
1154 * set in the destination, emit another assignment. It is possible
1155 * that the assignment could be of a vec4 to the last element of the
1156 * matrix. In this case col_idx==cols, but there is still data
1157 * left in the source parameter. Obviously, don't emit an assignment
1158 * to data outside the destination matrix.
1160 if ((col_idx
< cols
) && (rhs_base
< rhs_components
)) {
1161 const unsigned count
= rhs_components
- rhs_base
;
1163 rhs_var_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1165 ir_instruction
*inst
= assign_to_matrix_column(var
, col_idx
,
1170 instructions
->push_tail(inst
);
1177 return new(ctx
) ir_dereference_variable(var
);
1182 emit_inline_record_constructor(const glsl_type
*type
,
1183 exec_list
*instructions
,
1184 exec_list
*parameters
,
1187 ir_variable
*const var
=
1188 new(mem_ctx
) ir_variable(type
, "record_ctor", ir_var_temporary
);
1189 ir_dereference_variable
*const d
= new(mem_ctx
) ir_dereference_variable(var
);
1191 instructions
->push_tail(var
);
1193 exec_node
*node
= parameters
->head
;
1194 for (unsigned i
= 0; i
< type
->length
; i
++) {
1195 assert(!node
->is_tail_sentinel());
1197 ir_dereference
*const lhs
=
1198 new(mem_ctx
) ir_dereference_record(d
->clone(mem_ctx
, NULL
),
1199 type
->fields
.structure
[i
].name
);
1201 ir_rvalue
*const rhs
= ((ir_instruction
*) node
)->as_rvalue();
1202 assert(rhs
!= NULL
);
1204 ir_instruction
*const assign
= new(mem_ctx
) ir_assignment(lhs
, rhs
, NULL
);
1206 instructions
->push_tail(assign
);
1215 ast_function_expression::hir(exec_list
*instructions
,
1216 struct _mesa_glsl_parse_state
*state
)
1219 /* There are three sorts of function calls.
1221 * 1. constructors - The first subexpression is an ast_type_specifier.
1222 * 2. methods - Only the .length() method of array types.
1223 * 3. functions - Calls to regular old functions.
1225 * Method calls are actually detected when the ast_field_selection
1226 * expression is handled.
1228 if (is_constructor()) {
1229 const ast_type_specifier
*type
= (ast_type_specifier
*) subexpressions
[0];
1230 YYLTYPE loc
= type
->get_location();
1233 const glsl_type
*const constructor_type
= type
->glsl_type(& name
, state
);
1235 /* constructor_type can be NULL if a variable with the same name as the
1236 * structure has come into scope.
1238 if (constructor_type
== NULL
) {
1239 _mesa_glsl_error(& loc
, state
, "unknown type `%s' (structure name "
1240 "may be shadowed by a variable with the same name)",
1242 return ir_rvalue::error_value(ctx
);
1246 /* Constructors for samplers are illegal.
1248 if (constructor_type
->is_sampler()) {
1249 _mesa_glsl_error(& loc
, state
, "cannot construct sampler type `%s'",
1250 constructor_type
->name
);
1251 return ir_rvalue::error_value(ctx
);
1254 if (constructor_type
->is_array()) {
1255 if (state
->language_version
<= 110) {
1256 _mesa_glsl_error(& loc
, state
,
1257 "array constructors forbidden in GLSL 1.10");
1258 return ir_rvalue::error_value(ctx
);
1261 return process_array_constructor(instructions
, constructor_type
,
1262 & loc
, &this->expressions
, state
);
1266 /* There are two kinds of constructor call. Constructors for built-in
1267 * language types, such as mat4 and vec2, are free form. The only
1268 * requirement is that the parameters must provide enough values of the
1269 * correct scalar type. Constructors for arrays and structures must
1270 * have the exact number of parameters with matching types in the
1271 * correct order. These constructors follow essentially the same type
1272 * matching rules as functions.
1274 if (constructor_type
->is_record()) {
1275 exec_list actual_parameters
;
1277 process_parameters(instructions
, &actual_parameters
,
1278 &this->expressions
, state
);
1280 exec_node
*node
= actual_parameters
.head
;
1281 for (unsigned i
= 0; i
< constructor_type
->length
; i
++) {
1282 ir_rvalue
*ir
= (ir_rvalue
*) node
;
1284 if (node
->is_tail_sentinel()) {
1285 _mesa_glsl_error(&loc
, state
,
1286 "insufficient parameters to constructor "
1288 constructor_type
->name
);
1289 return ir_rvalue::error_value(ctx
);
1292 if (apply_implicit_conversion(constructor_type
->fields
.structure
[i
].type
,
1294 node
->replace_with(ir
);
1296 _mesa_glsl_error(&loc
, state
,
1297 "parameter type mismatch in constructor "
1298 "for `%s.%s' (%s vs %s)",
1299 constructor_type
->name
,
1300 constructor_type
->fields
.structure
[i
].name
,
1302 constructor_type
->fields
.structure
[i
].type
->name
);
1303 return ir_rvalue::error_value(ctx
);;
1309 if (!node
->is_tail_sentinel()) {
1310 _mesa_glsl_error(&loc
, state
, "too many parameters in constructor "
1311 "for `%s'", constructor_type
->name
);
1312 return ir_rvalue::error_value(ctx
);
1315 ir_rvalue
*const constant
=
1316 constant_record_constructor(constructor_type
, &actual_parameters
,
1319 return (constant
!= NULL
)
1321 : emit_inline_record_constructor(constructor_type
, instructions
,
1322 &actual_parameters
, state
);
1325 if (!constructor_type
->is_numeric() && !constructor_type
->is_boolean())
1326 return ir_rvalue::error_value(ctx
);
1328 /* Total number of components of the type being constructed. */
1329 const unsigned type_components
= constructor_type
->components();
1331 /* Number of components from parameters that have actually been
1332 * consumed. This is used to perform several kinds of error checking.
1334 unsigned components_used
= 0;
1336 unsigned matrix_parameters
= 0;
1337 unsigned nonmatrix_parameters
= 0;
1338 exec_list actual_parameters
;
1340 foreach_list (n
, &this->expressions
) {
1341 ast_node
*ast
= exec_node_data(ast_node
, n
, link
);
1342 ir_rvalue
*result
= ast
->hir(instructions
, state
)->as_rvalue();
1344 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
1346 * "It is an error to provide extra arguments beyond this
1347 * last used argument."
1349 if (components_used
>= type_components
) {
1350 _mesa_glsl_error(& loc
, state
, "too many parameters to `%s' "
1352 constructor_type
->name
);
1353 return ir_rvalue::error_value(ctx
);
1356 if (!result
->type
->is_numeric() && !result
->type
->is_boolean()) {
1357 _mesa_glsl_error(& loc
, state
, "cannot construct `%s' from a "
1358 "non-numeric data type",
1359 constructor_type
->name
);
1360 return ir_rvalue::error_value(ctx
);
1363 /* Count the number of matrix and nonmatrix parameters. This
1364 * is used below to enforce some of the constructor rules.
1366 if (result
->type
->is_matrix())
1367 matrix_parameters
++;
1369 nonmatrix_parameters
++;
1371 actual_parameters
.push_tail(result
);
1372 components_used
+= result
->type
->components();
1375 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
1377 * "It is an error to construct matrices from other matrices. This
1378 * is reserved for future use."
1380 if (state
->language_version
== 110 && matrix_parameters
> 0
1381 && constructor_type
->is_matrix()) {
1382 _mesa_glsl_error(& loc
, state
, "cannot construct `%s' from a "
1383 "matrix in GLSL 1.10",
1384 constructor_type
->name
);
1385 return ir_rvalue::error_value(ctx
);
1388 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
1390 * "If a matrix argument is given to a matrix constructor, it is
1391 * an error to have any other arguments."
1393 if ((matrix_parameters
> 0)
1394 && ((matrix_parameters
+ nonmatrix_parameters
) > 1)
1395 && constructor_type
->is_matrix()) {
1396 _mesa_glsl_error(& loc
, state
, "for matrix `%s' constructor, "
1397 "matrix must be only parameter",
1398 constructor_type
->name
);
1399 return ir_rvalue::error_value(ctx
);
1402 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
1404 * "In these cases, there must be enough components provided in the
1405 * arguments to provide an initializer for every component in the
1406 * constructed value."
1408 if (components_used
< type_components
&& components_used
!= 1
1409 && matrix_parameters
== 0) {
1410 _mesa_glsl_error(& loc
, state
, "too few components to construct "
1412 constructor_type
->name
);
1413 return ir_rvalue::error_value(ctx
);
1416 /* Later, we cast each parameter to the same base type as the
1417 * constructor. Since there are no non-floating point matrices, we
1418 * need to break them up into a series of column vectors.
1420 if (constructor_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1421 foreach_list_safe(n
, &actual_parameters
) {
1422 ir_rvalue
*matrix
= (ir_rvalue
*) n
;
1424 if (!matrix
->type
->is_matrix())
1427 /* Create a temporary containing the matrix. */
1428 ir_variable
*var
= new(ctx
) ir_variable(matrix
->type
, "matrix_tmp",
1430 instructions
->push_tail(var
);
1431 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
)
1432 ir_dereference_variable(var
), matrix
, NULL
));
1433 var
->constant_value
= matrix
->constant_expression_value();
1435 /* Replace the matrix with dereferences of its columns. */
1436 for (int i
= 0; i
< matrix
->type
->matrix_columns
; i
++) {
1437 matrix
->insert_before(new (ctx
) ir_dereference_array(var
,
1438 new(ctx
) ir_constant(i
)));
1444 bool all_parameters_are_constant
= true;
1446 /* Type cast each parameter and, if possible, fold constants.*/
1447 foreach_list_safe(n
, &actual_parameters
) {
1448 ir_rvalue
*ir
= (ir_rvalue
*) n
;
1450 const glsl_type
*desired_type
=
1451 glsl_type::get_instance(constructor_type
->base_type
,
1452 ir
->type
->vector_elements
,
1453 ir
->type
->matrix_columns
);
1454 ir_rvalue
*result
= convert_component(ir
, desired_type
);
1456 /* Attempt to convert the parameter to a constant valued expression.
1457 * After doing so, track whether or not all the parameters to the
1458 * constructor are trivially constant valued expressions.
1460 ir_rvalue
*const constant
= result
->constant_expression_value();
1462 if (constant
!= NULL
)
1465 all_parameters_are_constant
= false;
1468 ir
->replace_with(result
);
1472 /* If all of the parameters are trivially constant, create a
1473 * constant representing the complete collection of parameters.
1475 if (all_parameters_are_constant
) {
1476 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
1477 } else if (constructor_type
->is_scalar()) {
1478 return dereference_component((ir_rvalue
*) actual_parameters
.head
,
1480 } else if (constructor_type
->is_vector()) {
1481 return emit_inline_vector_constructor(constructor_type
,
1486 assert(constructor_type
->is_matrix());
1487 return emit_inline_matrix_constructor(constructor_type
,
1493 const ast_expression
*id
= subexpressions
[0];
1494 const char *func_name
= id
->primary_expression
.identifier
;
1495 YYLTYPE loc
= id
->get_location();
1496 exec_list actual_parameters
;
1498 process_parameters(instructions
, &actual_parameters
, &this->expressions
,
1501 ir_function_signature
*sig
=
1502 match_function_by_name(func_name
, &actual_parameters
, state
);
1504 ir_call
*call
= NULL
;
1505 ir_rvalue
*value
= NULL
;
1507 no_matching_function_error(func_name
, &loc
, &actual_parameters
, state
);
1508 value
= ir_rvalue::error_value(ctx
);
1509 } else if (!verify_parameter_modes(state
, sig
, actual_parameters
, this->expressions
)) {
1510 /* an error has already been emitted */
1511 value
= ir_rvalue::error_value(ctx
);
1513 value
= generate_call(instructions
, sig
, &loc
, &actual_parameters
,
1520 return ir_rvalue::error_value(ctx
);