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 * If a function call is generated, \c call_ir will point to it on exit.
98 * Otherwise \c call_ir will be set to \c NULL.
101 generate_call(exec_list
*instructions
, ir_function_signature
*sig
,
102 YYLTYPE
*loc
, exec_list
*actual_parameters
,
104 struct _mesa_glsl_parse_state
*state
)
107 exec_list post_call_conversions
;
111 /* Verify that 'out' and 'inout' actual parameters are lvalues. This
112 * isn't done in ir_function::matching_signature because that function
113 * cannot generate the necessary diagnostics.
115 * Also, validate that 'const_in' formal parameters (an extension of our
116 * IR) correspond to ir_constant actual parameters.
118 * Also, perform implicit conversion of arguments. Note: to implicitly
119 * convert out parameters, we need to place them in a temporary
120 * variable, and do the conversion after the call takes place. Since we
121 * haven't emitted the call yet, we'll place the post-call conversions
122 * in a temporary exec_list, and emit them later.
124 exec_list_iterator actual_iter
= actual_parameters
->iterator();
125 exec_list_iterator formal_iter
= sig
->parameters
.iterator();
127 while (actual_iter
.has_next()) {
128 ir_rvalue
*actual
= (ir_rvalue
*) actual_iter
.get();
129 ir_variable
*formal
= (ir_variable
*) formal_iter
.get();
131 assert(actual
!= NULL
);
132 assert(formal
!= NULL
);
134 if (formal
->mode
== ir_var_const_in
&& !actual
->as_constant()) {
135 _mesa_glsl_error(loc
, state
,
136 "parameter `%s' must be a constant expression",
138 return ir_call::get_error_instruction(ctx
);
141 if ((formal
->mode
== ir_var_out
)
142 || (formal
->mode
== ir_var_inout
)) {
143 const char *mode
= NULL
;
144 switch (formal
->mode
) {
145 case ir_var_out
: mode
= "out"; break;
146 case ir_var_inout
: mode
= "inout"; break;
147 default: assert(false); break;
149 /* FIXME: 'loc' is incorrect (as of 2011-01-21). It is always
152 if (actual
->variable_referenced()
153 && actual
->variable_referenced()->read_only
) {
154 _mesa_glsl_error(loc
, state
,
155 "function parameter '%s %s' references the "
156 "read-only variable '%s'",
158 actual
->variable_referenced()->name
);
160 } else if (!actual
->is_lvalue()) {
161 _mesa_glsl_error(loc
, state
,
162 "function parameter '%s %s' is not an lvalue",
167 if (formal
->type
->is_numeric() || formal
->type
->is_boolean()) {
168 switch (formal
->mode
) {
169 case ir_var_const_in
:
172 = convert_component(actual
, formal
->type
);
173 actual
->replace_with(converted
);
177 if (actual
->type
!= formal
->type
) {
178 /* To convert an out parameter, we need to create a
179 * temporary variable to hold the value before conversion,
180 * and then perform the conversion after the function call
183 * This has the effect of transforming code like this:
189 * Into IR that's equivalent to this:
193 * int out_parameter_conversion;
194 * f(out_parameter_conversion);
195 * value = float(out_parameter_conversion);
198 new(ctx
) ir_variable(formal
->type
,
199 "out_parameter_conversion",
201 instructions
->push_tail(tmp
);
202 ir_dereference_variable
*deref_tmp_1
203 = new(ctx
) ir_dereference_variable(tmp
);
204 ir_dereference_variable
*deref_tmp_2
205 = new(ctx
) ir_dereference_variable(tmp
);
206 ir_rvalue
*converted_tmp
207 = convert_component(deref_tmp_1
, actual
->type
);
208 ir_assignment
*assignment
209 = new(ctx
) ir_assignment(actual
, converted_tmp
);
210 post_call_conversions
.push_tail(assignment
);
211 actual
->replace_with(deref_tmp_2
);
215 /* Inout parameters should never require conversion, since that
216 * would require an implicit conversion to exist both to and
217 * from the formal parameter type, and there are no
218 * bidirectional implicit conversions.
220 assert (actual
->type
== formal
->type
);
223 assert (!"Illegal formal parameter mode");
232 /* Always insert the call in the instruction stream, and return a deref
233 * of its return val if it returns a value, since we don't know if
234 * the rvalue is going to be assigned to anything or not.
236 * Also insert any out parameter conversions after the call.
238 ir_call
*call
= new(ctx
) ir_call(sig
, actual_parameters
);
239 ir_dereference_variable
*deref
;
240 if (!sig
->return_type
->is_void()) {
241 /* If the function call is a constant expression, don't
242 * generate the instructions to call it; just generate an
243 * ir_constant representing the constant value.
245 * Function calls can only be constant expressions starting
248 if (state
->language_version
>= 120) {
249 ir_constant
*const_val
= call
->constant_expression_value();
257 var
= new(ctx
) ir_variable(sig
->return_type
,
258 ralloc_asprintf(ctx
, "%s_retval",
259 sig
->function_name()),
261 instructions
->push_tail(var
);
263 deref
= new(ctx
) ir_dereference_variable(var
);
264 ir_assignment
*assign
= new(ctx
) ir_assignment(deref
, call
, NULL
);
265 instructions
->push_tail(assign
);
268 deref
= new(ctx
) ir_dereference_variable(var
);
270 instructions
->push_tail(call
);
274 instructions
->append_list(&post_call_conversions
);
279 match_function_by_name(exec_list
*instructions
, const char *name
,
280 YYLTYPE
*loc
, exec_list
*actual_parameters
,
282 struct _mesa_glsl_parse_state
*state
)
285 ir_function
*f
= state
->symbols
->get_function(name
);
286 ir_function_signature
*local_sig
= NULL
;
287 ir_function_signature
*sig
= NULL
;
289 /* Is the function hidden by a record type constructor? */
290 if (state
->symbols
->get_type(name
))
291 goto done
; /* no match */
293 /* Is the function hidden by a variable (impossible in 1.10)? */
294 if (state
->language_version
!= 110 && state
->symbols
->get_variable(name
))
295 goto done
; /* no match */
298 /* Look for a match in the local shader. If exact, we're done. */
299 bool is_exact
= false;
300 sig
= local_sig
= f
->matching_signature(actual_parameters
, &is_exact
);
304 if (!state
->es_shader
&& f
->has_user_signature()) {
305 /* In desktop GL, the presence of a user-defined signature hides any
306 * built-in signatures, so we must ignore them. In contrast, in ES2
307 * user-defined signatures add new overloads, so we must proceed.
313 /* Local shader has no exact candidates; check the built-ins. */
314 _mesa_glsl_initialize_functions(state
);
315 for (unsigned i
= 0; i
< state
->num_builtins_to_link
; i
++) {
316 ir_function
*builtin
=
317 state
->builtins_to_link
[i
]->symbols
->get_function(name
);
321 bool is_exact
= false;
322 ir_function_signature
*builtin_sig
=
323 builtin
->matching_signature(actual_parameters
, &is_exact
);
325 if (builtin_sig
== NULL
)
328 /* If the built-in signature is exact, we can stop. */
335 /* We found an inexact match, which is better than nothing. However,
336 * we should keep searching for an exact match.
344 /* If the match is from a linked built-in shader, import the prototype. */
345 if (sig
!= local_sig
) {
347 f
= new(ctx
) ir_function(name
);
348 state
->symbols
->add_global_function(f
);
349 emit_function(state
, f
);
351 f
->add_signature(sig
->clone_prototype(f
, NULL
));
354 /* Finally, generate a call instruction. */
355 return generate_call(instructions
, sig
, loc
, actual_parameters
,
358 char *str
= prototype_string(NULL
, name
, actual_parameters
);
360 _mesa_glsl_error(loc
, state
, "no matching function for call to `%s'",
364 const char *prefix
= "candidates are: ";
366 for (int i
= -1; i
< (int) state
->num_builtins_to_link
; i
++) {
367 glsl_symbol_table
*syms
= i
>= 0 ? state
->builtins_to_link
[i
]->symbols
369 f
= syms
->get_function(name
);
373 foreach_list (node
, &f
->signatures
) {
374 ir_function_signature
*sig
= (ir_function_signature
*) node
;
376 str
= prototype_string(sig
->return_type
, f
->name
, &sig
->parameters
);
377 _mesa_glsl_error(loc
, state
, "%s%s", prefix
, str
);
385 return ir_call::get_error_instruction(ctx
);
391 * Perform automatic type conversion of constructor parameters
393 * This implements the rules in the "Conversion and Scalar Constructors"
394 * section (GLSL 1.10 section 5.4.1), not the "Implicit Conversions" rules.
397 convert_component(ir_rvalue
*src
, const glsl_type
*desired_type
)
399 void *ctx
= ralloc_parent(src
);
400 const unsigned a
= desired_type
->base_type
;
401 const unsigned b
= src
->type
->base_type
;
402 ir_expression
*result
= NULL
;
404 if (src
->type
->is_error())
407 assert(a
<= GLSL_TYPE_BOOL
);
408 assert(b
<= GLSL_TYPE_BOOL
);
417 result
= new(ctx
) ir_expression(ir_unop_i2u
, src
);
419 case GLSL_TYPE_FLOAT
:
420 result
= new(ctx
) ir_expression(ir_unop_i2u
,
421 new(ctx
) ir_expression(ir_unop_f2i
, src
));
424 result
= new(ctx
) ir_expression(ir_unop_i2u
,
425 new(ctx
) ir_expression(ir_unop_b2i
, src
));
432 result
= new(ctx
) ir_expression(ir_unop_u2i
, src
);
434 case GLSL_TYPE_FLOAT
:
435 result
= new(ctx
) ir_expression(ir_unop_f2i
, src
);
438 result
= new(ctx
) ir_expression(ir_unop_b2i
, src
);
442 case GLSL_TYPE_FLOAT
:
445 result
= new(ctx
) ir_expression(ir_unop_u2f
, desired_type
, src
, NULL
);
448 result
= new(ctx
) ir_expression(ir_unop_i2f
, desired_type
, src
, NULL
);
451 result
= new(ctx
) ir_expression(ir_unop_b2f
, desired_type
, src
, NULL
);
458 result
= new(ctx
) ir_expression(ir_unop_i2b
,
459 new(ctx
) ir_expression(ir_unop_u2i
, src
));
462 result
= new(ctx
) ir_expression(ir_unop_i2b
, desired_type
, src
, NULL
);
464 case GLSL_TYPE_FLOAT
:
465 result
= new(ctx
) ir_expression(ir_unop_f2b
, desired_type
, src
, NULL
);
471 assert(result
!= NULL
);
472 assert(result
->type
== desired_type
);
474 /* Try constant folding; it may fold in the conversion we just added. */
475 ir_constant
*const constant
= result
->constant_expression_value();
476 return (constant
!= NULL
) ? (ir_rvalue
*) constant
: (ir_rvalue
*) result
;
480 * Dereference a specific component from a scalar, vector, or matrix
483 dereference_component(ir_rvalue
*src
, unsigned component
)
485 void *ctx
= ralloc_parent(src
);
486 assert(component
< src
->type
->components());
488 /* If the source is a constant, just create a new constant instead of a
489 * dereference of the existing constant.
491 ir_constant
*constant
= src
->as_constant();
493 return new(ctx
) ir_constant(constant
, component
);
495 if (src
->type
->is_scalar()) {
497 } else if (src
->type
->is_vector()) {
498 return new(ctx
) ir_swizzle(src
, component
, 0, 0, 0, 1);
500 assert(src
->type
->is_matrix());
502 /* Dereference a row of the matrix, then call this function again to get
503 * a specific element from that row.
505 const int c
= component
/ src
->type
->column_type()->vector_elements
;
506 const int r
= component
% src
->type
->column_type()->vector_elements
;
507 ir_constant
*const col_index
= new(ctx
) ir_constant(c
);
508 ir_dereference
*const col
= new(ctx
) ir_dereference_array(src
, col_index
);
510 col
->type
= src
->type
->column_type();
512 return dereference_component(col
, r
);
515 assert(!"Should not get here.");
521 process_array_constructor(exec_list
*instructions
,
522 const glsl_type
*constructor_type
,
523 YYLTYPE
*loc
, exec_list
*parameters
,
524 struct _mesa_glsl_parse_state
*state
)
527 /* Array constructors come in two forms: sized and unsized. Sized array
528 * constructors look like 'vec4[2](a, b)', where 'a' and 'b' are vec4
529 * variables. In this case the number of parameters must exactly match the
530 * specified size of the array.
532 * Unsized array constructors look like 'vec4[](a, b)', where 'a' and 'b'
533 * are vec4 variables. In this case the size of the array being constructed
534 * is determined by the number of parameters.
536 * From page 52 (page 58 of the PDF) of the GLSL 1.50 spec:
538 * "There must be exactly the same number of arguments as the size of
539 * the array being constructed. If no size is present in the
540 * constructor, then the array is explicitly sized to the number of
541 * arguments provided. The arguments are assigned in order, starting at
542 * element 0, to the elements of the constructed array. Each argument
543 * must be the same type as the element type of the array, or be a type
544 * that can be converted to the element type of the array according to
545 * Section 4.1.10 "Implicit Conversions.""
547 exec_list actual_parameters
;
548 const unsigned parameter_count
=
549 process_parameters(instructions
, &actual_parameters
, parameters
, state
);
551 if ((parameter_count
== 0)
552 || ((constructor_type
->length
!= 0)
553 && (constructor_type
->length
!= parameter_count
))) {
554 const unsigned min_param
= (constructor_type
->length
== 0)
555 ? 1 : constructor_type
->length
;
557 _mesa_glsl_error(loc
, state
, "array constructor must have %s %u "
559 (constructor_type
->length
!= 0) ? "at least" : "exactly",
560 min_param
, (min_param
<= 1) ? "" : "s");
561 return ir_call::get_error_instruction(ctx
);
564 if (constructor_type
->length
== 0) {
566 glsl_type::get_array_instance(constructor_type
->element_type(),
568 assert(constructor_type
!= NULL
);
569 assert(constructor_type
->length
== parameter_count
);
572 bool all_parameters_are_constant
= true;
574 /* Type cast each parameter and, if possible, fold constants. */
575 foreach_list_safe(n
, &actual_parameters
) {
576 ir_rvalue
*ir
= (ir_rvalue
*) n
;
577 ir_rvalue
*result
= ir
;
579 /* Apply implicit conversions (not the scalar constructor rules!). See
580 * the spec quote above. */
581 if (constructor_type
->element_type()->is_float()) {
582 const glsl_type
*desired_type
=
583 glsl_type::get_instance(GLSL_TYPE_FLOAT
,
584 ir
->type
->vector_elements
,
585 ir
->type
->matrix_columns
);
586 if (result
->type
->can_implicitly_convert_to(desired_type
)) {
587 /* Even though convert_component() implements the constructor
588 * conversion rules (not the implicit conversion rules), its safe
589 * to use it here because we already checked that the implicit
590 * conversion is legal.
592 result
= convert_component(ir
, desired_type
);
596 if (result
->type
!= constructor_type
->element_type()) {
597 _mesa_glsl_error(loc
, state
, "type error in array constructor: "
598 "expected: %s, found %s",
599 constructor_type
->element_type()->name
,
603 /* Attempt to convert the parameter to a constant valued expression.
604 * After doing so, track whether or not all the parameters to the
605 * constructor are trivially constant valued expressions.
607 ir_rvalue
*const constant
= result
->constant_expression_value();
609 if (constant
!= NULL
)
612 all_parameters_are_constant
= false;
614 ir
->replace_with(result
);
617 if (all_parameters_are_constant
)
618 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
620 ir_variable
*var
= new(ctx
) ir_variable(constructor_type
, "array_ctor",
622 instructions
->push_tail(var
);
625 foreach_list(node
, &actual_parameters
) {
626 ir_rvalue
*rhs
= (ir_rvalue
*) node
;
627 ir_rvalue
*lhs
= new(ctx
) ir_dereference_array(var
,
628 new(ctx
) ir_constant(i
));
630 ir_instruction
*assignment
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
631 instructions
->push_tail(assignment
);
636 return new(ctx
) ir_dereference_variable(var
);
641 * Try to convert a record constructor to a constant expression
644 constant_record_constructor(const glsl_type
*constructor_type
,
645 exec_list
*parameters
, void *mem_ctx
)
647 foreach_list(node
, parameters
) {
648 ir_constant
*constant
= ((ir_instruction
*) node
)->as_constant();
649 if (constant
== NULL
)
651 node
->replace_with(constant
);
654 return new(mem_ctx
) ir_constant(constructor_type
, parameters
);
659 * Determine if a list consists of a single scalar r-value
662 single_scalar_parameter(exec_list
*parameters
)
664 const ir_rvalue
*const p
= (ir_rvalue
*) parameters
->head
;
665 assert(((ir_rvalue
*)p
)->as_rvalue() != NULL
);
667 return (p
->type
->is_scalar() && p
->next
->is_tail_sentinel());
672 * Generate inline code for a vector constructor
674 * The generated constructor code will consist of a temporary variable
675 * declaration of the same type as the constructor. A sequence of assignments
676 * from constructor parameters to the temporary will follow.
679 * An \c ir_dereference_variable of the temprorary generated in the constructor
683 emit_inline_vector_constructor(const glsl_type
*type
,
684 exec_list
*instructions
,
685 exec_list
*parameters
,
688 assert(!parameters
->is_empty());
690 ir_variable
*var
= new(ctx
) ir_variable(type
, "vec_ctor", ir_var_temporary
);
691 instructions
->push_tail(var
);
693 /* There are two kinds of vector constructors.
695 * - Construct a vector from a single scalar by replicating that scalar to
696 * all components of the vector.
698 * - Construct a vector from an arbirary combination of vectors and
699 * scalars. The components of the constructor parameters are assigned
700 * to the vector in order until the vector is full.
702 const unsigned lhs_components
= type
->components();
703 if (single_scalar_parameter(parameters
)) {
704 ir_rvalue
*first_param
= (ir_rvalue
*)parameters
->head
;
705 ir_rvalue
*rhs
= new(ctx
) ir_swizzle(first_param
, 0, 0, 0, 0,
707 ir_dereference_variable
*lhs
= new(ctx
) ir_dereference_variable(var
);
708 const unsigned mask
= (1U << lhs_components
) - 1;
710 assert(rhs
->type
== lhs
->type
);
712 ir_instruction
*inst
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
, mask
);
713 instructions
->push_tail(inst
);
715 unsigned base_component
= 0;
716 unsigned base_lhs_component
= 0;
717 ir_constant_data data
;
718 unsigned constant_mask
= 0, constant_components
= 0;
720 memset(&data
, 0, sizeof(data
));
722 foreach_list(node
, parameters
) {
723 ir_rvalue
*param
= (ir_rvalue
*) node
;
724 unsigned rhs_components
= param
->type
->components();
726 /* Do not try to assign more components to the vector than it has!
728 if ((rhs_components
+ base_lhs_component
) > lhs_components
) {
729 rhs_components
= lhs_components
- base_lhs_component
;
732 const ir_constant
*const c
= param
->as_constant();
734 for (unsigned i
= 0; i
< rhs_components
; i
++) {
735 switch (c
->type
->base_type
) {
737 data
.u
[i
+ base_component
] = c
->get_uint_component(i
);
740 data
.i
[i
+ base_component
] = c
->get_int_component(i
);
742 case GLSL_TYPE_FLOAT
:
743 data
.f
[i
+ base_component
] = c
->get_float_component(i
);
746 data
.b
[i
+ base_component
] = c
->get_bool_component(i
);
749 assert(!"Should not get here.");
754 /* Mask of fields to be written in the assignment.
756 constant_mask
|= ((1U << rhs_components
) - 1) << base_lhs_component
;
757 constant_components
+= rhs_components
;
759 base_component
+= rhs_components
;
761 /* Advance the component index by the number of components
762 * that were just assigned.
764 base_lhs_component
+= rhs_components
;
767 if (constant_mask
!= 0) {
768 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
769 const glsl_type
*rhs_type
= glsl_type::get_instance(var
->type
->base_type
,
772 ir_rvalue
*rhs
= new(ctx
) ir_constant(rhs_type
, &data
);
774 ir_instruction
*inst
=
775 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, constant_mask
);
776 instructions
->push_tail(inst
);
780 foreach_list(node
, parameters
) {
781 ir_rvalue
*param
= (ir_rvalue
*) node
;
782 unsigned rhs_components
= param
->type
->components();
784 /* Do not try to assign more components to the vector than it has!
786 if ((rhs_components
+ base_component
) > lhs_components
) {
787 rhs_components
= lhs_components
- base_component
;
790 const ir_constant
*const c
= param
->as_constant();
792 /* Mask of fields to be written in the assignment.
794 const unsigned write_mask
= ((1U << rhs_components
) - 1)
797 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
799 /* Generate a swizzle so that LHS and RHS sizes match.
802 new(ctx
) ir_swizzle(param
, 0, 1, 2, 3, rhs_components
);
804 ir_instruction
*inst
=
805 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, write_mask
);
806 instructions
->push_tail(inst
);
809 /* Advance the component index by the number of components that were
812 base_component
+= rhs_components
;
815 return new(ctx
) ir_dereference_variable(var
);
820 * Generate assignment of a portion of a vector to a portion of a matrix column
822 * \param src_base First component of the source to be used in assignment
823 * \param column Column of destination to be assiged
824 * \param row_base First component of the destination column to be assigned
825 * \param count Number of components to be assigned
828 * \c src_base + \c count must be less than or equal to the number of components
829 * in the source vector.
832 assign_to_matrix_column(ir_variable
*var
, unsigned column
, unsigned row_base
,
833 ir_rvalue
*src
, unsigned src_base
, unsigned count
,
836 ir_constant
*col_idx
= new(mem_ctx
) ir_constant(column
);
837 ir_dereference
*column_ref
= new(mem_ctx
) ir_dereference_array(var
, col_idx
);
839 assert(column_ref
->type
->components() >= (row_base
+ count
));
840 assert(src
->type
->components() >= (src_base
+ count
));
842 /* Generate a swizzle that extracts the number of components from the source
843 * that are to be assigned to the column of the matrix.
845 if (count
< src
->type
->vector_elements
) {
846 src
= new(mem_ctx
) ir_swizzle(src
,
847 src_base
+ 0, src_base
+ 1,
848 src_base
+ 2, src_base
+ 3,
852 /* Mask of fields to be written in the assignment.
854 const unsigned write_mask
= ((1U << count
) - 1) << row_base
;
856 return new(mem_ctx
) ir_assignment(column_ref
, src
, NULL
, write_mask
);
861 * Generate inline code for a matrix constructor
863 * The generated constructor code will consist of a temporary variable
864 * declaration of the same type as the constructor. A sequence of assignments
865 * from constructor parameters to the temporary will follow.
868 * An \c ir_dereference_variable of the temprorary generated in the constructor
872 emit_inline_matrix_constructor(const glsl_type
*type
,
873 exec_list
*instructions
,
874 exec_list
*parameters
,
877 assert(!parameters
->is_empty());
879 ir_variable
*var
= new(ctx
) ir_variable(type
, "mat_ctor", ir_var_temporary
);
880 instructions
->push_tail(var
);
882 /* There are three kinds of matrix constructors.
884 * - Construct a matrix from a single scalar by replicating that scalar to
885 * along the diagonal of the matrix and setting all other components to
888 * - Construct a matrix from an arbirary combination of vectors and
889 * scalars. The components of the constructor parameters are assigned
890 * to the matrix in colum-major order until the matrix is full.
892 * - Construct a matrix from a single matrix. The source matrix is copied
893 * to the upper left portion of the constructed matrix, and the remaining
894 * elements take values from the identity matrix.
896 ir_rvalue
*const first_param
= (ir_rvalue
*) parameters
->head
;
897 if (single_scalar_parameter(parameters
)) {
898 /* Assign the scalar to the X component of a vec4, and fill the remaining
899 * components with zero.
901 ir_variable
*rhs_var
=
902 new(ctx
) ir_variable(glsl_type::vec4_type
, "mat_ctor_vec",
904 instructions
->push_tail(rhs_var
);
906 ir_constant_data zero
;
912 ir_instruction
*inst
=
913 new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(rhs_var
),
914 new(ctx
) ir_constant(rhs_var
->type
, &zero
),
916 instructions
->push_tail(inst
);
918 ir_dereference
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
920 inst
= new(ctx
) ir_assignment(rhs_ref
, first_param
, NULL
, 0x01);
921 instructions
->push_tail(inst
);
923 /* Assign the temporary vector to each column of the destination matrix
924 * with a swizzle that puts the X component on the diagonal of the
925 * matrix. In some cases this may mean that the X component does not
926 * get assigned into the column at all (i.e., when the matrix has more
927 * columns than rows).
929 static const unsigned rhs_swiz
[4][4] = {
936 const unsigned cols_to_init
= MIN2(type
->matrix_columns
,
937 type
->vector_elements
);
938 for (unsigned i
= 0; i
< cols_to_init
; i
++) {
939 ir_constant
*const col_idx
= new(ctx
) ir_constant(i
);
940 ir_rvalue
*const col_ref
= new(ctx
) ir_dereference_array(var
, col_idx
);
942 ir_rvalue
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
943 ir_rvalue
*const rhs
= new(ctx
) ir_swizzle(rhs_ref
, rhs_swiz
[i
],
944 type
->vector_elements
);
946 inst
= new(ctx
) ir_assignment(col_ref
, rhs
, NULL
);
947 instructions
->push_tail(inst
);
950 for (unsigned i
= cols_to_init
; i
< type
->matrix_columns
; i
++) {
951 ir_constant
*const col_idx
= new(ctx
) ir_constant(i
);
952 ir_rvalue
*const col_ref
= new(ctx
) ir_dereference_array(var
, col_idx
);
954 ir_rvalue
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
955 ir_rvalue
*const rhs
= new(ctx
) ir_swizzle(rhs_ref
, 1, 1, 1, 1,
956 type
->vector_elements
);
958 inst
= new(ctx
) ir_assignment(col_ref
, rhs
, NULL
);
959 instructions
->push_tail(inst
);
961 } else if (first_param
->type
->is_matrix()) {
962 /* From page 50 (56 of the PDF) of the GLSL 1.50 spec:
964 * "If a matrix is constructed from a matrix, then each component
965 * (column i, row j) in the result that has a corresponding
966 * component (column i, row j) in the argument will be initialized
967 * from there. All other components will be initialized to the
968 * identity matrix. If a matrix argument is given to a matrix
969 * constructor, it is an error to have any other arguments."
971 assert(first_param
->next
->is_tail_sentinel());
972 ir_rvalue
*const src_matrix
= first_param
;
974 /* If the source matrix is smaller, pre-initialize the relavent parts of
975 * the destination matrix to the identity matrix.
977 if ((src_matrix
->type
->matrix_columns
< var
->type
->matrix_columns
)
978 || (src_matrix
->type
->vector_elements
< var
->type
->vector_elements
)) {
980 /* If the source matrix has fewer rows, every column of the destination
981 * must be initialized. Otherwise only the columns in the destination
982 * that do not exist in the source must be initialized.
985 (src_matrix
->type
->vector_elements
< var
->type
->vector_elements
)
986 ? 0 : src_matrix
->type
->matrix_columns
;
988 const glsl_type
*const col_type
= var
->type
->column_type();
989 for (/* empty */; col
< var
->type
->matrix_columns
; col
++) {
990 ir_constant_data ident
;
999 ir_rvalue
*const rhs
= new(ctx
) ir_constant(col_type
, &ident
);
1001 ir_rvalue
*const lhs
=
1002 new(ctx
) ir_dereference_array(var
, new(ctx
) ir_constant(col
));
1004 ir_instruction
*inst
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
1005 instructions
->push_tail(inst
);
1009 /* Assign columns from the source matrix to the destination matrix.
1011 * Since the parameter will be used in the RHS of multiple assignments,
1012 * generate a temporary and copy the paramter there.
1014 ir_variable
*const rhs_var
=
1015 new(ctx
) ir_variable(first_param
->type
, "mat_ctor_mat",
1017 instructions
->push_tail(rhs_var
);
1019 ir_dereference
*const rhs_var_ref
=
1020 new(ctx
) ir_dereference_variable(rhs_var
);
1021 ir_instruction
*const inst
=
1022 new(ctx
) ir_assignment(rhs_var_ref
, first_param
, NULL
);
1023 instructions
->push_tail(inst
);
1025 const unsigned last_row
= MIN2(src_matrix
->type
->vector_elements
,
1026 var
->type
->vector_elements
);
1027 const unsigned last_col
= MIN2(src_matrix
->type
->matrix_columns
,
1028 var
->type
->matrix_columns
);
1030 unsigned swiz
[4] = { 0, 0, 0, 0 };
1031 for (unsigned i
= 1; i
< last_row
; i
++)
1034 const unsigned write_mask
= (1U << last_row
) - 1;
1036 for (unsigned i
= 0; i
< last_col
; i
++) {
1037 ir_dereference
*const lhs
=
1038 new(ctx
) ir_dereference_array(var
, new(ctx
) ir_constant(i
));
1039 ir_rvalue
*const rhs_col
=
1040 new(ctx
) ir_dereference_array(rhs_var
, new(ctx
) ir_constant(i
));
1042 /* If one matrix has columns that are smaller than the columns of the
1043 * other matrix, wrap the column access of the larger with a swizzle
1044 * so that the LHS and RHS of the assignment have the same size (and
1045 * therefore have the same type).
1047 * It would be perfectly valid to unconditionally generate the
1048 * swizzles, this this will typically result in a more compact IR tree.
1051 if (lhs
->type
->vector_elements
!= rhs_col
->type
->vector_elements
) {
1052 rhs
= new(ctx
) ir_swizzle(rhs_col
, swiz
, last_row
);
1057 ir_instruction
*inst
=
1058 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, write_mask
);
1059 instructions
->push_tail(inst
);
1062 const unsigned cols
= type
->matrix_columns
;
1063 const unsigned rows
= type
->vector_elements
;
1064 unsigned col_idx
= 0;
1065 unsigned row_idx
= 0;
1067 foreach_list (node
, parameters
) {
1068 ir_rvalue
*const rhs
= (ir_rvalue
*) node
;
1069 const unsigned components_remaining_this_column
= rows
- row_idx
;
1070 unsigned rhs_components
= rhs
->type
->components();
1071 unsigned rhs_base
= 0;
1073 /* Since the parameter might be used in the RHS of two assignments,
1074 * generate a temporary and copy the paramter there.
1076 ir_variable
*rhs_var
=
1077 new(ctx
) ir_variable(rhs
->type
, "mat_ctor_vec", ir_var_temporary
);
1078 instructions
->push_tail(rhs_var
);
1080 ir_dereference
*rhs_var_ref
=
1081 new(ctx
) ir_dereference_variable(rhs_var
);
1082 ir_instruction
*inst
= new(ctx
) ir_assignment(rhs_var_ref
, rhs
, NULL
);
1083 instructions
->push_tail(inst
);
1085 /* Assign the current parameter to as many components of the matrix
1088 * NOTE: A single vector parameter can span two matrix columns. A
1089 * single vec4, for example, can completely fill a mat2.
1091 if (rhs_components
>= components_remaining_this_column
) {
1092 const unsigned count
= MIN2(rhs_components
,
1093 components_remaining_this_column
);
1095 rhs_var_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1097 ir_instruction
*inst
= assign_to_matrix_column(var
, col_idx
,
1101 instructions
->push_tail(inst
);
1109 /* If there is data left in the parameter and components left to be
1110 * set in the destination, emit another assignment. It is possible
1111 * that the assignment could be of a vec4 to the last element of the
1112 * matrix. In this case col_idx==cols, but there is still data
1113 * left in the source parameter. Obviously, don't emit an assignment
1114 * to data outside the destination matrix.
1116 if ((col_idx
< cols
) && (rhs_base
< rhs_components
)) {
1117 const unsigned count
= rhs_components
- rhs_base
;
1119 rhs_var_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1121 ir_instruction
*inst
= assign_to_matrix_column(var
, col_idx
,
1126 instructions
->push_tail(inst
);
1133 return new(ctx
) ir_dereference_variable(var
);
1138 emit_inline_record_constructor(const glsl_type
*type
,
1139 exec_list
*instructions
,
1140 exec_list
*parameters
,
1143 ir_variable
*const var
=
1144 new(mem_ctx
) ir_variable(type
, "record_ctor", ir_var_temporary
);
1145 ir_dereference_variable
*const d
= new(mem_ctx
) ir_dereference_variable(var
);
1147 instructions
->push_tail(var
);
1149 exec_node
*node
= parameters
->head
;
1150 for (unsigned i
= 0; i
< type
->length
; i
++) {
1151 assert(!node
->is_tail_sentinel());
1153 ir_dereference
*const lhs
=
1154 new(mem_ctx
) ir_dereference_record(d
->clone(mem_ctx
, NULL
),
1155 type
->fields
.structure
[i
].name
);
1157 ir_rvalue
*const rhs
= ((ir_instruction
*) node
)->as_rvalue();
1158 assert(rhs
!= NULL
);
1160 ir_instruction
*const assign
= new(mem_ctx
) ir_assignment(lhs
, rhs
, NULL
);
1162 instructions
->push_tail(assign
);
1171 ast_function_expression::hir(exec_list
*instructions
,
1172 struct _mesa_glsl_parse_state
*state
)
1175 /* There are three sorts of function calls.
1177 * 1. constructors - The first subexpression is an ast_type_specifier.
1178 * 2. methods - Only the .length() method of array types.
1179 * 3. functions - Calls to regular old functions.
1181 * Method calls are actually detected when the ast_field_selection
1182 * expression is handled.
1184 if (is_constructor()) {
1185 const ast_type_specifier
*type
= (ast_type_specifier
*) subexpressions
[0];
1186 YYLTYPE loc
= type
->get_location();
1189 const glsl_type
*const constructor_type
= type
->glsl_type(& name
, state
);
1191 /* constructor_type can be NULL if a variable with the same name as the
1192 * structure has come into scope.
1194 if (constructor_type
== NULL
) {
1195 _mesa_glsl_error(& loc
, state
, "unknown type `%s' (structure name "
1196 "may be shadowed by a variable with the same name)",
1198 return ir_call::get_error_instruction(ctx
);
1202 /* Constructors for samplers are illegal.
1204 if (constructor_type
->is_sampler()) {
1205 _mesa_glsl_error(& loc
, state
, "cannot construct sampler type `%s'",
1206 constructor_type
->name
);
1207 return ir_call::get_error_instruction(ctx
);
1210 if (constructor_type
->is_array()) {
1211 if (state
->language_version
<= 110) {
1212 _mesa_glsl_error(& loc
, state
,
1213 "array constructors forbidden in GLSL 1.10");
1214 return ir_call::get_error_instruction(ctx
);
1217 return process_array_constructor(instructions
, constructor_type
,
1218 & loc
, &this->expressions
, state
);
1222 /* There are two kinds of constructor call. Constructors for built-in
1223 * language types, such as mat4 and vec2, are free form. The only
1224 * requirement is that the parameters must provide enough values of the
1225 * correct scalar type. Constructors for arrays and structures must
1226 * have the exact number of parameters with matching types in the
1227 * correct order. These constructors follow essentially the same type
1228 * matching rules as functions.
1230 if (constructor_type
->is_record()) {
1231 exec_list actual_parameters
;
1233 process_parameters(instructions
, &actual_parameters
,
1234 &this->expressions
, state
);
1236 exec_node
*node
= actual_parameters
.head
;
1237 for (unsigned i
= 0; i
< constructor_type
->length
; i
++) {
1238 ir_rvalue
*ir
= (ir_rvalue
*) node
;
1240 if (node
->is_tail_sentinel()) {
1241 _mesa_glsl_error(&loc
, state
,
1242 "insufficient parameters to constructor "
1244 constructor_type
->name
);
1245 return ir_call::get_error_instruction(ctx
);
1248 if (apply_implicit_conversion(constructor_type
->fields
.structure
[i
].type
,
1250 node
->replace_with(ir
);
1252 _mesa_glsl_error(&loc
, state
,
1253 "parameter type mismatch in constructor "
1254 "for `%s.%s' (%s vs %s)",
1255 constructor_type
->name
,
1256 constructor_type
->fields
.structure
[i
].name
,
1258 constructor_type
->fields
.structure
[i
].type
->name
);
1259 return ir_call::get_error_instruction(ctx
);;
1265 if (!node
->is_tail_sentinel()) {
1266 _mesa_glsl_error(&loc
, state
, "too many parameters in constructor "
1267 "for `%s'", constructor_type
->name
);
1268 return ir_call::get_error_instruction(ctx
);
1271 ir_rvalue
*const constant
=
1272 constant_record_constructor(constructor_type
, &actual_parameters
,
1275 return (constant
!= NULL
)
1277 : emit_inline_record_constructor(constructor_type
, instructions
,
1278 &actual_parameters
, state
);
1281 if (!constructor_type
->is_numeric() && !constructor_type
->is_boolean())
1282 return ir_call::get_error_instruction(ctx
);
1284 /* Total number of components of the type being constructed. */
1285 const unsigned type_components
= constructor_type
->components();
1287 /* Number of components from parameters that have actually been
1288 * consumed. This is used to perform several kinds of error checking.
1290 unsigned components_used
= 0;
1292 unsigned matrix_parameters
= 0;
1293 unsigned nonmatrix_parameters
= 0;
1294 exec_list actual_parameters
;
1296 foreach_list (n
, &this->expressions
) {
1297 ast_node
*ast
= exec_node_data(ast_node
, n
, link
);
1298 ir_rvalue
*result
= ast
->hir(instructions
, state
)->as_rvalue();
1300 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
1302 * "It is an error to provide extra arguments beyond this
1303 * last used argument."
1305 if (components_used
>= type_components
) {
1306 _mesa_glsl_error(& loc
, state
, "too many parameters to `%s' "
1308 constructor_type
->name
);
1309 return ir_call::get_error_instruction(ctx
);
1312 if (!result
->type
->is_numeric() && !result
->type
->is_boolean()) {
1313 _mesa_glsl_error(& loc
, state
, "cannot construct `%s' from a "
1314 "non-numeric data type",
1315 constructor_type
->name
);
1316 return ir_call::get_error_instruction(ctx
);
1319 /* Count the number of matrix and nonmatrix parameters. This
1320 * is used below to enforce some of the constructor rules.
1322 if (result
->type
->is_matrix())
1323 matrix_parameters
++;
1325 nonmatrix_parameters
++;
1327 actual_parameters
.push_tail(result
);
1328 components_used
+= result
->type
->components();
1331 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
1333 * "It is an error to construct matrices from other matrices. This
1334 * is reserved for future use."
1336 if (state
->language_version
== 110 && matrix_parameters
> 0
1337 && constructor_type
->is_matrix()) {
1338 _mesa_glsl_error(& loc
, state
, "cannot construct `%s' from a "
1339 "matrix in GLSL 1.10",
1340 constructor_type
->name
);
1341 return ir_call::get_error_instruction(ctx
);
1344 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
1346 * "If a matrix argument is given to a matrix constructor, it is
1347 * an error to have any other arguments."
1349 if ((matrix_parameters
> 0)
1350 && ((matrix_parameters
+ nonmatrix_parameters
) > 1)
1351 && constructor_type
->is_matrix()) {
1352 _mesa_glsl_error(& loc
, state
, "for matrix `%s' constructor, "
1353 "matrix must be only parameter",
1354 constructor_type
->name
);
1355 return ir_call::get_error_instruction(ctx
);
1358 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
1360 * "In these cases, there must be enough components provided in the
1361 * arguments to provide an initializer for every component in the
1362 * constructed value."
1364 if (components_used
< type_components
&& components_used
!= 1
1365 && matrix_parameters
== 0) {
1366 _mesa_glsl_error(& loc
, state
, "too few components to construct "
1368 constructor_type
->name
);
1369 return ir_call::get_error_instruction(ctx
);
1372 /* Later, we cast each parameter to the same base type as the
1373 * constructor. Since there are no non-floating point matrices, we
1374 * need to break them up into a series of column vectors.
1376 if (constructor_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1377 foreach_list_safe(n
, &actual_parameters
) {
1378 ir_rvalue
*matrix
= (ir_rvalue
*) n
;
1380 if (!matrix
->type
->is_matrix())
1383 /* Create a temporary containing the matrix. */
1384 ir_variable
*var
= new(ctx
) ir_variable(matrix
->type
, "matrix_tmp",
1386 instructions
->push_tail(var
);
1387 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
)
1388 ir_dereference_variable(var
), matrix
, NULL
));
1389 var
->constant_value
= matrix
->constant_expression_value();
1391 /* Replace the matrix with dereferences of its columns. */
1392 for (int i
= 0; i
< matrix
->type
->matrix_columns
; i
++) {
1393 matrix
->insert_before(new (ctx
) ir_dereference_array(var
,
1394 new(ctx
) ir_constant(i
)));
1400 bool all_parameters_are_constant
= true;
1402 /* Type cast each parameter and, if possible, fold constants.*/
1403 foreach_list_safe(n
, &actual_parameters
) {
1404 ir_rvalue
*ir
= (ir_rvalue
*) n
;
1406 const glsl_type
*desired_type
=
1407 glsl_type::get_instance(constructor_type
->base_type
,
1408 ir
->type
->vector_elements
,
1409 ir
->type
->matrix_columns
);
1410 ir_rvalue
*result
= convert_component(ir
, desired_type
);
1412 /* Attempt to convert the parameter to a constant valued expression.
1413 * After doing so, track whether or not all the parameters to the
1414 * constructor are trivially constant valued expressions.
1416 ir_rvalue
*const constant
= result
->constant_expression_value();
1418 if (constant
!= NULL
)
1421 all_parameters_are_constant
= false;
1424 ir
->replace_with(result
);
1428 /* If all of the parameters are trivially constant, create a
1429 * constant representing the complete collection of parameters.
1431 if (all_parameters_are_constant
) {
1432 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
1433 } else if (constructor_type
->is_scalar()) {
1434 return dereference_component((ir_rvalue
*) actual_parameters
.head
,
1436 } else if (constructor_type
->is_vector()) {
1437 return emit_inline_vector_constructor(constructor_type
,
1442 assert(constructor_type
->is_matrix());
1443 return emit_inline_matrix_constructor(constructor_type
,
1449 const ast_expression
*id
= subexpressions
[0];
1450 YYLTYPE loc
= id
->get_location();
1451 exec_list actual_parameters
;
1453 process_parameters(instructions
, &actual_parameters
, &this->expressions
,
1456 ir_call
*call
= NULL
;
1457 ir_rvalue
*const value
=
1458 match_function_by_name(instructions
,
1459 id
->primary_expression
.identifier
,
1460 &loc
, &actual_parameters
, &call
, state
);
1463 /* If a function was found, make sure that none of the 'out' or 'inout'
1464 * parameters violate the extra l-value rules.
1466 ir_function_signature
*f
= call
->get_callee();
1469 exec_node
*formal_node
= f
->parameters
.head
;
1471 foreach_list (actual_node
, &this->expressions
) {
1472 /* Both parameter lists had better be the same length!
1474 assert(!actual_node
->is_tail_sentinel());
1476 const ir_variable
*const formal_parameter
=
1477 (ir_variable
*) formal_node
;
1478 const ast_expression
*const actual_parameter
=
1479 exec_node_data(ast_expression
, actual_node
, link
);
1481 if ((formal_parameter
->mode
== ir_var_out
1482 || formal_parameter
->mode
== ir_var_inout
)
1483 && actual_parameter
->non_lvalue_description
!= NULL
) {
1484 YYLTYPE loc
= actual_parameter
->get_location();
1486 _mesa_glsl_error(&loc
, state
,
1487 "function parameter '%s %s' references a %s",
1488 (formal_parameter
->mode
== ir_var_out
)
1490 formal_parameter
->name
,
1491 actual_parameter
->non_lvalue_description
);
1492 return ir_call::get_error_instruction(ctx
);
1495 /* Only advance the formal_node pointer here because the
1496 * foreach_list business already advances actual_node.
1498 formal_node
= formal_node
->next
;
1505 return ir_call::get_error_instruction(ctx
);