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
, ")");
98 match_function_by_name(exec_list
*instructions
, const char *name
,
99 YYLTYPE
*loc
, exec_list
*actual_parameters
,
100 struct _mesa_glsl_parse_state
*state
)
103 ir_function
*f
= state
->symbols
->get_function(name
);
104 ir_function_signature
*sig
;
106 sig
= f
? f
->matching_signature(actual_parameters
) : NULL
;
108 /* FINISHME: This doesn't handle the case where shader X contains a
109 * FINISHME: matching signature but shader X + N contains an _exact_
110 * FINISHME: matching signature.
113 && (f
== NULL
|| state
->es_shader
|| !f
->has_user_signature())
114 && state
->symbols
->get_type(name
) == NULL
115 && (state
->language_version
== 110
116 || state
->symbols
->get_variable(name
) == NULL
)) {
117 /* The current shader doesn't contain a matching function or signature.
118 * Before giving up, look for the prototype in the built-in functions.
120 for (unsigned i
= 0; i
< state
->num_builtins_to_link
; i
++) {
121 ir_function
*builtin
;
122 builtin
= state
->builtins_to_link
[i
]->symbols
->get_function(name
);
123 sig
= builtin
? builtin
->matching_signature(actual_parameters
) : NULL
;
126 f
= new(ctx
) ir_function(name
);
127 state
->symbols
->add_global_function(f
);
128 emit_function(state
, f
);
131 f
->add_signature(sig
->clone_prototype(f
, NULL
));
138 /* Verify that 'out' and 'inout' actual parameters are lvalues. This
139 * isn't done in ir_function::matching_signature because that function
140 * cannot generate the necessary diagnostics.
142 * Also, validate that 'const_in' formal parameters (an extension of our
143 * IR) correspond to ir_constant actual parameters.
145 exec_list_iterator actual_iter
= actual_parameters
->iterator();
146 exec_list_iterator formal_iter
= sig
->parameters
.iterator();
148 while (actual_iter
.has_next()) {
149 ir_rvalue
*actual
= (ir_rvalue
*) actual_iter
.get();
150 ir_variable
*formal
= (ir_variable
*) formal_iter
.get();
152 assert(actual
!= NULL
);
153 assert(formal
!= NULL
);
155 if (formal
->mode
== ir_var_const_in
&& !actual
->as_constant()) {
156 _mesa_glsl_error(loc
, state
,
157 "parameter `%s' must be a constant expression",
161 if ((formal
->mode
== ir_var_out
)
162 || (formal
->mode
== ir_var_inout
)) {
163 const char *mode
= NULL
;
164 switch (formal
->mode
) {
165 case ir_var_out
: mode
= "out"; break;
166 case ir_var_inout
: mode
= "inout"; break;
167 default: assert(false); break;
169 /* FIXME: 'loc' is incorrect (as of 2011-01-21). It is always
172 if (actual
->variable_referenced()
173 && actual
->variable_referenced()->read_only
) {
174 _mesa_glsl_error(loc
, state
,
175 "function parameter '%s %s' references the "
176 "read-only variable '%s'",
178 actual
->variable_referenced()->name
);
180 } else if (!actual
->is_lvalue()) {
181 _mesa_glsl_error(loc
, state
,
182 "function parameter '%s %s' is not an lvalue",
187 if (formal
->type
->is_numeric() || formal
->type
->is_boolean()) {
188 ir_rvalue
*converted
= convert_component(actual
, formal
->type
);
189 actual
->replace_with(converted
);
196 /* Always insert the call in the instruction stream, and return a deref
197 * of its return val if it returns a value, since we don't know if
198 * the rvalue is going to be assigned to anything or not.
200 ir_call
*call
= new(ctx
) ir_call(sig
, actual_parameters
);
201 if (!sig
->return_type
->is_void()) {
202 /* If the function call is a constant expression, don't
203 * generate the instructions to call it; just generate an
204 * ir_constant representing the constant value.
206 * Function calls can only be constant expressions starting
209 if (state
->language_version
>= 120) {
210 ir_constant
*const_val
= call
->constant_expression_value();
217 ir_dereference_variable
*deref
;
219 var
= new(ctx
) ir_variable(sig
->return_type
,
220 ralloc_asprintf(ctx
, "%s_retval",
221 sig
->function_name()),
223 instructions
->push_tail(var
);
225 deref
= new(ctx
) ir_dereference_variable(var
);
226 ir_assignment
*assign
= new(ctx
) ir_assignment(deref
, call
, NULL
);
227 instructions
->push_tail(assign
);
229 deref
= new(ctx
) ir_dereference_variable(var
);
232 instructions
->push_tail(call
);
236 char *str
= prototype_string(NULL
, name
, actual_parameters
);
238 _mesa_glsl_error(loc
, state
, "no matching function for call to `%s'",
242 const char *prefix
= "candidates are: ";
244 for (int i
= -1; i
< (int) state
->num_builtins_to_link
; i
++) {
245 glsl_symbol_table
*syms
= i
>= 0 ? state
->builtins_to_link
[i
]->symbols
247 f
= syms
->get_function(name
);
251 foreach_list (node
, &f
->signatures
) {
252 ir_function_signature
*sig
= (ir_function_signature
*) node
;
254 str
= prototype_string(sig
->return_type
, f
->name
, &sig
->parameters
);
255 _mesa_glsl_error(loc
, state
, "%s%s", prefix
, str
);
263 return ir_call::get_error_instruction(ctx
);
269 * Perform automatic type conversion of constructor parameters
271 * This implements the rules in the "Conversion and Scalar Constructors"
272 * section (GLSL 1.10 section 5.4.1), not the "Implicit Conversions" rules.
275 convert_component(ir_rvalue
*src
, const glsl_type
*desired_type
)
277 void *ctx
= ralloc_parent(src
);
278 const unsigned a
= desired_type
->base_type
;
279 const unsigned b
= src
->type
->base_type
;
280 ir_expression
*result
= NULL
;
282 if (src
->type
->is_error())
285 assert(a
<= GLSL_TYPE_BOOL
);
286 assert(b
<= GLSL_TYPE_BOOL
);
295 result
= new(ctx
) ir_expression(ir_unop_i2u
, src
);
297 case GLSL_TYPE_FLOAT
:
298 result
= new(ctx
) ir_expression(ir_unop_i2u
,
299 new(ctx
) ir_expression(ir_unop_f2i
, src
));
302 result
= new(ctx
) ir_expression(ir_unop_i2u
,
303 new(ctx
) ir_expression(ir_unop_b2i
, src
));
310 result
= new(ctx
) ir_expression(ir_unop_u2i
, src
);
312 case GLSL_TYPE_FLOAT
:
313 result
= new(ctx
) ir_expression(ir_unop_f2i
, src
);
316 result
= new(ctx
) ir_expression(ir_unop_b2i
, src
);
320 case GLSL_TYPE_FLOAT
:
323 result
= new(ctx
) ir_expression(ir_unop_u2f
, desired_type
, src
, NULL
);
326 result
= new(ctx
) ir_expression(ir_unop_i2f
, desired_type
, src
, NULL
);
329 result
= new(ctx
) ir_expression(ir_unop_b2f
, desired_type
, src
, NULL
);
336 result
= new(ctx
) ir_expression(ir_unop_i2b
,
337 new(ctx
) ir_expression(ir_unop_u2i
, src
));
340 result
= new(ctx
) ir_expression(ir_unop_i2b
, desired_type
, src
, NULL
);
342 case GLSL_TYPE_FLOAT
:
343 result
= new(ctx
) ir_expression(ir_unop_f2b
, desired_type
, src
, NULL
);
349 assert(result
!= NULL
);
350 assert(result
->type
== desired_type
);
352 /* Try constant folding; it may fold in the conversion we just added. */
353 ir_constant
*const constant
= result
->constant_expression_value();
354 return (constant
!= NULL
) ? (ir_rvalue
*) constant
: (ir_rvalue
*) result
;
358 * Dereference a specific component from a scalar, vector, or matrix
361 dereference_component(ir_rvalue
*src
, unsigned component
)
363 void *ctx
= ralloc_parent(src
);
364 assert(component
< src
->type
->components());
366 /* If the source is a constant, just create a new constant instead of a
367 * dereference of the existing constant.
369 ir_constant
*constant
= src
->as_constant();
371 return new(ctx
) ir_constant(constant
, component
);
373 if (src
->type
->is_scalar()) {
375 } else if (src
->type
->is_vector()) {
376 return new(ctx
) ir_swizzle(src
, component
, 0, 0, 0, 1);
378 assert(src
->type
->is_matrix());
380 /* Dereference a row of the matrix, then call this function again to get
381 * a specific element from that row.
383 const int c
= component
/ src
->type
->column_type()->vector_elements
;
384 const int r
= component
% src
->type
->column_type()->vector_elements
;
385 ir_constant
*const col_index
= new(ctx
) ir_constant(c
);
386 ir_dereference
*const col
= new(ctx
) ir_dereference_array(src
, col_index
);
388 col
->type
= src
->type
->column_type();
390 return dereference_component(col
, r
);
393 assert(!"Should not get here.");
399 process_array_constructor(exec_list
*instructions
,
400 const glsl_type
*constructor_type
,
401 YYLTYPE
*loc
, exec_list
*parameters
,
402 struct _mesa_glsl_parse_state
*state
)
405 /* Array constructors come in two forms: sized and unsized. Sized array
406 * constructors look like 'vec4[2](a, b)', where 'a' and 'b' are vec4
407 * variables. In this case the number of parameters must exactly match the
408 * specified size of the array.
410 * Unsized array constructors look like 'vec4[](a, b)', where 'a' and 'b'
411 * are vec4 variables. In this case the size of the array being constructed
412 * is determined by the number of parameters.
414 * From page 52 (page 58 of the PDF) of the GLSL 1.50 spec:
416 * "There must be exactly the same number of arguments as the size of
417 * the array being constructed. If no size is present in the
418 * constructor, then the array is explicitly sized to the number of
419 * arguments provided. The arguments are assigned in order, starting at
420 * element 0, to the elements of the constructed array. Each argument
421 * must be the same type as the element type of the array, or be a type
422 * that can be converted to the element type of the array according to
423 * Section 4.1.10 "Implicit Conversions.""
425 exec_list actual_parameters
;
426 const unsigned parameter_count
=
427 process_parameters(instructions
, &actual_parameters
, parameters
, state
);
429 if ((parameter_count
== 0)
430 || ((constructor_type
->length
!= 0)
431 && (constructor_type
->length
!= parameter_count
))) {
432 const unsigned min_param
= (constructor_type
->length
== 0)
433 ? 1 : constructor_type
->length
;
435 _mesa_glsl_error(loc
, state
, "array constructor must have %s %u "
437 (constructor_type
->length
!= 0) ? "at least" : "exactly",
438 min_param
, (min_param
<= 1) ? "" : "s");
439 return ir_call::get_error_instruction(ctx
);
442 if (constructor_type
->length
== 0) {
444 glsl_type::get_array_instance(constructor_type
->element_type(),
446 assert(constructor_type
!= NULL
);
447 assert(constructor_type
->length
== parameter_count
);
450 bool all_parameters_are_constant
= true;
452 /* Type cast each parameter and, if possible, fold constants. */
453 foreach_list_safe(n
, &actual_parameters
) {
454 ir_rvalue
*ir
= (ir_rvalue
*) n
;
455 ir_rvalue
*result
= ir
;
457 /* Apply implicit conversions (not the scalar constructor rules!). See
458 * the spec quote above. */
459 if (constructor_type
->element_type()->is_float()) {
460 const glsl_type
*desired_type
=
461 glsl_type::get_instance(GLSL_TYPE_FLOAT
,
462 ir
->type
->vector_elements
,
463 ir
->type
->matrix_columns
);
464 if (result
->type
->can_implicitly_convert_to(desired_type
)) {
465 /* Even though convert_component() implements the constructor
466 * conversion rules (not the implicit conversion rules), its safe
467 * to use it here because we already checked that the implicit
468 * conversion is legal.
470 result
= convert_component(ir
, desired_type
);
474 if (result
->type
!= constructor_type
->element_type()) {
475 _mesa_glsl_error(loc
, state
, "type error in array constructor: "
476 "expected: %s, found %s",
477 constructor_type
->element_type()->name
,
481 /* Attempt to convert the parameter to a constant valued expression.
482 * After doing so, track whether or not all the parameters to the
483 * constructor are trivially constant valued expressions.
485 ir_rvalue
*const constant
= result
->constant_expression_value();
487 if (constant
!= NULL
)
490 all_parameters_are_constant
= false;
492 ir
->replace_with(result
);
495 if (all_parameters_are_constant
)
496 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
498 ir_variable
*var
= new(ctx
) ir_variable(constructor_type
, "array_ctor",
500 instructions
->push_tail(var
);
503 foreach_list(node
, &actual_parameters
) {
504 ir_rvalue
*rhs
= (ir_rvalue
*) node
;
505 ir_rvalue
*lhs
= new(ctx
) ir_dereference_array(var
,
506 new(ctx
) ir_constant(i
));
508 ir_instruction
*assignment
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
509 instructions
->push_tail(assignment
);
514 return new(ctx
) ir_dereference_variable(var
);
519 * Try to convert a record constructor to a constant expression
522 constant_record_constructor(const glsl_type
*constructor_type
,
523 exec_list
*parameters
, void *mem_ctx
)
525 foreach_list(node
, parameters
) {
526 ir_constant
*constant
= ((ir_instruction
*) node
)->as_constant();
527 if (constant
== NULL
)
529 node
->replace_with(constant
);
532 return new(mem_ctx
) ir_constant(constructor_type
, parameters
);
537 * Determine if a list consists of a single scalar r-value
540 single_scalar_parameter(exec_list
*parameters
)
542 const ir_rvalue
*const p
= (ir_rvalue
*) parameters
->head
;
543 assert(((ir_rvalue
*)p
)->as_rvalue() != NULL
);
545 return (p
->type
->is_scalar() && p
->next
->is_tail_sentinel());
550 * Generate inline code for a vector constructor
552 * The generated constructor code will consist of a temporary variable
553 * declaration of the same type as the constructor. A sequence of assignments
554 * from constructor parameters to the temporary will follow.
557 * An \c ir_dereference_variable of the temprorary generated in the constructor
561 emit_inline_vector_constructor(const glsl_type
*type
,
562 exec_list
*instructions
,
563 exec_list
*parameters
,
566 assert(!parameters
->is_empty());
568 ir_variable
*var
= new(ctx
) ir_variable(type
, "vec_ctor", ir_var_temporary
);
569 instructions
->push_tail(var
);
571 /* There are two kinds of vector constructors.
573 * - Construct a vector from a single scalar by replicating that scalar to
574 * all components of the vector.
576 * - Construct a vector from an arbirary combination of vectors and
577 * scalars. The components of the constructor parameters are assigned
578 * to the vector in order until the vector is full.
580 const unsigned lhs_components
= type
->components();
581 if (single_scalar_parameter(parameters
)) {
582 ir_rvalue
*first_param
= (ir_rvalue
*)parameters
->head
;
583 ir_rvalue
*rhs
= new(ctx
) ir_swizzle(first_param
, 0, 0, 0, 0,
585 ir_dereference_variable
*lhs
= new(ctx
) ir_dereference_variable(var
);
586 const unsigned mask
= (1U << lhs_components
) - 1;
588 assert(rhs
->type
== lhs
->type
);
590 ir_instruction
*inst
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
, mask
);
591 instructions
->push_tail(inst
);
593 unsigned base_component
= 0;
594 unsigned base_lhs_component
= 0;
595 ir_constant_data data
;
596 unsigned constant_mask
= 0, constant_components
= 0;
598 memset(&data
, 0, sizeof(data
));
600 foreach_list(node
, parameters
) {
601 ir_rvalue
*param
= (ir_rvalue
*) node
;
602 unsigned rhs_components
= param
->type
->components();
604 /* Do not try to assign more components to the vector than it has!
606 if ((rhs_components
+ base_lhs_component
) > lhs_components
) {
607 rhs_components
= lhs_components
- base_lhs_component
;
610 const ir_constant
*const c
= param
->as_constant();
612 for (unsigned i
= 0; i
< rhs_components
; i
++) {
613 switch (c
->type
->base_type
) {
615 data
.u
[i
+ base_component
] = c
->get_uint_component(i
);
618 data
.i
[i
+ base_component
] = c
->get_int_component(i
);
620 case GLSL_TYPE_FLOAT
:
621 data
.f
[i
+ base_component
] = c
->get_float_component(i
);
624 data
.b
[i
+ base_component
] = c
->get_bool_component(i
);
627 assert(!"Should not get here.");
632 /* Mask of fields to be written in the assignment.
634 constant_mask
|= ((1U << rhs_components
) - 1) << base_lhs_component
;
635 constant_components
+= rhs_components
;
637 base_component
+= rhs_components
;
639 /* Advance the component index by the number of components
640 * that were just assigned.
642 base_lhs_component
+= rhs_components
;
645 if (constant_mask
!= 0) {
646 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
647 const glsl_type
*rhs_type
= glsl_type::get_instance(var
->type
->base_type
,
650 ir_rvalue
*rhs
= new(ctx
) ir_constant(rhs_type
, &data
);
652 ir_instruction
*inst
=
653 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, constant_mask
);
654 instructions
->push_tail(inst
);
658 foreach_list(node
, parameters
) {
659 ir_rvalue
*param
= (ir_rvalue
*) node
;
660 unsigned rhs_components
= param
->type
->components();
662 /* Do not try to assign more components to the vector than it has!
664 if ((rhs_components
+ base_component
) > lhs_components
) {
665 rhs_components
= lhs_components
- base_component
;
668 const ir_constant
*const c
= param
->as_constant();
670 /* Mask of fields to be written in the assignment.
672 const unsigned write_mask
= ((1U << rhs_components
) - 1)
675 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
677 /* Generate a swizzle so that LHS and RHS sizes match.
680 new(ctx
) ir_swizzle(param
, 0, 1, 2, 3, rhs_components
);
682 ir_instruction
*inst
=
683 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, write_mask
);
684 instructions
->push_tail(inst
);
687 /* Advance the component index by the number of components that were
690 base_component
+= rhs_components
;
693 return new(ctx
) ir_dereference_variable(var
);
698 * Generate assignment of a portion of a vector to a portion of a matrix column
700 * \param src_base First component of the source to be used in assignment
701 * \param column Column of destination to be assiged
702 * \param row_base First component of the destination column to be assigned
703 * \param count Number of components to be assigned
706 * \c src_base + \c count must be less than or equal to the number of components
707 * in the source vector.
710 assign_to_matrix_column(ir_variable
*var
, unsigned column
, unsigned row_base
,
711 ir_rvalue
*src
, unsigned src_base
, unsigned count
,
714 ir_constant
*col_idx
= new(mem_ctx
) ir_constant(column
);
715 ir_dereference
*column_ref
= new(mem_ctx
) ir_dereference_array(var
, col_idx
);
717 assert(column_ref
->type
->components() >= (row_base
+ count
));
718 assert(src
->type
->components() >= (src_base
+ count
));
720 /* Generate a swizzle that extracts the number of components from the source
721 * that are to be assigned to the column of the matrix.
723 if (count
< src
->type
->vector_elements
) {
724 src
= new(mem_ctx
) ir_swizzle(src
,
725 src_base
+ 0, src_base
+ 1,
726 src_base
+ 2, src_base
+ 3,
730 /* Mask of fields to be written in the assignment.
732 const unsigned write_mask
= ((1U << count
) - 1) << row_base
;
734 return new(mem_ctx
) ir_assignment(column_ref
, src
, NULL
, write_mask
);
739 * Generate inline code for a matrix constructor
741 * The generated constructor code will consist of a temporary variable
742 * declaration of the same type as the constructor. A sequence of assignments
743 * from constructor parameters to the temporary will follow.
746 * An \c ir_dereference_variable of the temprorary generated in the constructor
750 emit_inline_matrix_constructor(const glsl_type
*type
,
751 exec_list
*instructions
,
752 exec_list
*parameters
,
755 assert(!parameters
->is_empty());
757 ir_variable
*var
= new(ctx
) ir_variable(type
, "mat_ctor", ir_var_temporary
);
758 instructions
->push_tail(var
);
760 /* There are three kinds of matrix constructors.
762 * - Construct a matrix from a single scalar by replicating that scalar to
763 * along the diagonal of the matrix and setting all other components to
766 * - Construct a matrix from an arbirary combination of vectors and
767 * scalars. The components of the constructor parameters are assigned
768 * to the matrix in colum-major order until the matrix is full.
770 * - Construct a matrix from a single matrix. The source matrix is copied
771 * to the upper left portion of the constructed matrix, and the remaining
772 * elements take values from the identity matrix.
774 ir_rvalue
*const first_param
= (ir_rvalue
*) parameters
->head
;
775 if (single_scalar_parameter(parameters
)) {
776 /* Assign the scalar to the X component of a vec4, and fill the remaining
777 * components with zero.
779 ir_variable
*rhs_var
=
780 new(ctx
) ir_variable(glsl_type::vec4_type
, "mat_ctor_vec",
782 instructions
->push_tail(rhs_var
);
784 ir_constant_data zero
;
790 ir_instruction
*inst
=
791 new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(rhs_var
),
792 new(ctx
) ir_constant(rhs_var
->type
, &zero
),
794 instructions
->push_tail(inst
);
796 ir_dereference
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
798 inst
= new(ctx
) ir_assignment(rhs_ref
, first_param
, NULL
, 0x01);
799 instructions
->push_tail(inst
);
801 /* Assign the temporary vector to each column of the destination matrix
802 * with a swizzle that puts the X component on the diagonal of the
803 * matrix. In some cases this may mean that the X component does not
804 * get assigned into the column at all (i.e., when the matrix has more
805 * columns than rows).
807 static const unsigned rhs_swiz
[4][4] = {
814 const unsigned cols_to_init
= MIN2(type
->matrix_columns
,
815 type
->vector_elements
);
816 for (unsigned i
= 0; i
< cols_to_init
; i
++) {
817 ir_constant
*const col_idx
= new(ctx
) ir_constant(i
);
818 ir_rvalue
*const col_ref
= new(ctx
) ir_dereference_array(var
, col_idx
);
820 ir_rvalue
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
821 ir_rvalue
*const rhs
= new(ctx
) ir_swizzle(rhs_ref
, rhs_swiz
[i
],
822 type
->vector_elements
);
824 inst
= new(ctx
) ir_assignment(col_ref
, rhs
, NULL
);
825 instructions
->push_tail(inst
);
828 for (unsigned i
= cols_to_init
; i
< type
->matrix_columns
; i
++) {
829 ir_constant
*const col_idx
= new(ctx
) ir_constant(i
);
830 ir_rvalue
*const col_ref
= new(ctx
) ir_dereference_array(var
, col_idx
);
832 ir_rvalue
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
833 ir_rvalue
*const rhs
= new(ctx
) ir_swizzle(rhs_ref
, 1, 1, 1, 1,
834 type
->vector_elements
);
836 inst
= new(ctx
) ir_assignment(col_ref
, rhs
, NULL
);
837 instructions
->push_tail(inst
);
839 } else if (first_param
->type
->is_matrix()) {
840 /* From page 50 (56 of the PDF) of the GLSL 1.50 spec:
842 * "If a matrix is constructed from a matrix, then each component
843 * (column i, row j) in the result that has a corresponding
844 * component (column i, row j) in the argument will be initialized
845 * from there. All other components will be initialized to the
846 * identity matrix. If a matrix argument is given to a matrix
847 * constructor, it is an error to have any other arguments."
849 assert(first_param
->next
->is_tail_sentinel());
850 ir_rvalue
*const src_matrix
= first_param
;
852 /* If the source matrix is smaller, pre-initialize the relavent parts of
853 * the destination matrix to the identity matrix.
855 if ((src_matrix
->type
->matrix_columns
< var
->type
->matrix_columns
)
856 || (src_matrix
->type
->vector_elements
< var
->type
->vector_elements
)) {
858 /* If the source matrix has fewer rows, every column of the destination
859 * must be initialized. Otherwise only the columns in the destination
860 * that do not exist in the source must be initialized.
863 (src_matrix
->type
->vector_elements
< var
->type
->vector_elements
)
864 ? 0 : src_matrix
->type
->matrix_columns
;
866 const glsl_type
*const col_type
= var
->type
->column_type();
867 for (/* empty */; col
< var
->type
->matrix_columns
; col
++) {
868 ir_constant_data ident
;
877 ir_rvalue
*const rhs
= new(ctx
) ir_constant(col_type
, &ident
);
879 ir_rvalue
*const lhs
=
880 new(ctx
) ir_dereference_array(var
, new(ctx
) ir_constant(col
));
882 ir_instruction
*inst
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
883 instructions
->push_tail(inst
);
887 /* Assign columns from the source matrix to the destination matrix.
889 * Since the parameter will be used in the RHS of multiple assignments,
890 * generate a temporary and copy the paramter there.
892 ir_variable
*const rhs_var
=
893 new(ctx
) ir_variable(first_param
->type
, "mat_ctor_mat",
895 instructions
->push_tail(rhs_var
);
897 ir_dereference
*const rhs_var_ref
=
898 new(ctx
) ir_dereference_variable(rhs_var
);
899 ir_instruction
*const inst
=
900 new(ctx
) ir_assignment(rhs_var_ref
, first_param
, NULL
);
901 instructions
->push_tail(inst
);
903 const unsigned last_row
= MIN2(src_matrix
->type
->vector_elements
,
904 var
->type
->vector_elements
);
905 const unsigned last_col
= MIN2(src_matrix
->type
->matrix_columns
,
906 var
->type
->matrix_columns
);
908 unsigned swiz
[4] = { 0, 0, 0, 0 };
909 for (unsigned i
= 1; i
< last_row
; i
++)
912 const unsigned write_mask
= (1U << last_row
) - 1;
914 for (unsigned i
= 0; i
< last_col
; i
++) {
915 ir_dereference
*const lhs
=
916 new(ctx
) ir_dereference_array(var
, new(ctx
) ir_constant(i
));
917 ir_rvalue
*const rhs_col
=
918 new(ctx
) ir_dereference_array(rhs_var
, new(ctx
) ir_constant(i
));
920 /* If one matrix has columns that are smaller than the columns of the
921 * other matrix, wrap the column access of the larger with a swizzle
922 * so that the LHS and RHS of the assignment have the same size (and
923 * therefore have the same type).
925 * It would be perfectly valid to unconditionally generate the
926 * swizzles, this this will typically result in a more compact IR tree.
929 if (lhs
->type
->vector_elements
!= rhs_col
->type
->vector_elements
) {
930 rhs
= new(ctx
) ir_swizzle(rhs_col
, swiz
, last_row
);
935 ir_instruction
*inst
=
936 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, write_mask
);
937 instructions
->push_tail(inst
);
940 const unsigned cols
= type
->matrix_columns
;
941 const unsigned rows
= type
->vector_elements
;
942 unsigned col_idx
= 0;
943 unsigned row_idx
= 0;
945 foreach_list (node
, parameters
) {
946 ir_rvalue
*const rhs
= (ir_rvalue
*) node
;
947 const unsigned components_remaining_this_column
= rows
- row_idx
;
948 unsigned rhs_components
= rhs
->type
->components();
949 unsigned rhs_base
= 0;
951 /* Since the parameter might be used in the RHS of two assignments,
952 * generate a temporary and copy the paramter there.
954 ir_variable
*rhs_var
=
955 new(ctx
) ir_variable(rhs
->type
, "mat_ctor_vec", ir_var_temporary
);
956 instructions
->push_tail(rhs_var
);
958 ir_dereference
*rhs_var_ref
=
959 new(ctx
) ir_dereference_variable(rhs_var
);
960 ir_instruction
*inst
= new(ctx
) ir_assignment(rhs_var_ref
, rhs
, NULL
);
961 instructions
->push_tail(inst
);
963 /* Assign the current parameter to as many components of the matrix
966 * NOTE: A single vector parameter can span two matrix columns. A
967 * single vec4, for example, can completely fill a mat2.
969 if (rhs_components
>= components_remaining_this_column
) {
970 const unsigned count
= MIN2(rhs_components
,
971 components_remaining_this_column
);
973 rhs_var_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
975 ir_instruction
*inst
= assign_to_matrix_column(var
, col_idx
,
979 instructions
->push_tail(inst
);
987 /* If there is data left in the parameter and components left to be
988 * set in the destination, emit another assignment. It is possible
989 * that the assignment could be of a vec4 to the last element of the
990 * matrix. In this case col_idx==cols, but there is still data
991 * left in the source parameter. Obviously, don't emit an assignment
992 * to data outside the destination matrix.
994 if ((col_idx
< cols
) && (rhs_base
< rhs_components
)) {
995 const unsigned count
= rhs_components
- rhs_base
;
997 rhs_var_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
999 ir_instruction
*inst
= assign_to_matrix_column(var
, col_idx
,
1004 instructions
->push_tail(inst
);
1011 return new(ctx
) ir_dereference_variable(var
);
1016 emit_inline_record_constructor(const glsl_type
*type
,
1017 exec_list
*instructions
,
1018 exec_list
*parameters
,
1021 ir_variable
*const var
=
1022 new(mem_ctx
) ir_variable(type
, "record_ctor", ir_var_temporary
);
1023 ir_dereference_variable
*const d
= new(mem_ctx
) ir_dereference_variable(var
);
1025 instructions
->push_tail(var
);
1027 exec_node
*node
= parameters
->head
;
1028 for (unsigned i
= 0; i
< type
->length
; i
++) {
1029 assert(!node
->is_tail_sentinel());
1031 ir_dereference
*const lhs
=
1032 new(mem_ctx
) ir_dereference_record(d
->clone(mem_ctx
, NULL
),
1033 type
->fields
.structure
[i
].name
);
1035 ir_rvalue
*const rhs
= ((ir_instruction
*) node
)->as_rvalue();
1036 assert(rhs
!= NULL
);
1038 ir_instruction
*const assign
= new(mem_ctx
) ir_assignment(lhs
, rhs
, NULL
);
1040 instructions
->push_tail(assign
);
1049 ast_function_expression::hir(exec_list
*instructions
,
1050 struct _mesa_glsl_parse_state
*state
)
1053 /* There are three sorts of function calls.
1055 * 1. constructors - The first subexpression is an ast_type_specifier.
1056 * 2. methods - Only the .length() method of array types.
1057 * 3. functions - Calls to regular old functions.
1059 * Method calls are actually detected when the ast_field_selection
1060 * expression is handled.
1062 if (is_constructor()) {
1063 const ast_type_specifier
*type
= (ast_type_specifier
*) subexpressions
[0];
1064 YYLTYPE loc
= type
->get_location();
1067 const glsl_type
*const constructor_type
= type
->glsl_type(& name
, state
);
1069 /* constructor_type can be NULL if a variable with the same name as the
1070 * structure has come into scope.
1072 if (constructor_type
== NULL
) {
1073 _mesa_glsl_error(& loc
, state
, "unknown type `%s' (structure name "
1074 "may be shadowed by a variable with the same name)",
1076 return ir_call::get_error_instruction(ctx
);
1080 /* Constructors for samplers are illegal.
1082 if (constructor_type
->is_sampler()) {
1083 _mesa_glsl_error(& loc
, state
, "cannot construct sampler type `%s'",
1084 constructor_type
->name
);
1085 return ir_call::get_error_instruction(ctx
);
1088 if (constructor_type
->is_array()) {
1089 if (state
->language_version
<= 110) {
1090 _mesa_glsl_error(& loc
, state
,
1091 "array constructors forbidden in GLSL 1.10");
1092 return ir_call::get_error_instruction(ctx
);
1095 return process_array_constructor(instructions
, constructor_type
,
1096 & loc
, &this->expressions
, state
);
1100 /* There are two kinds of constructor call. Constructors for built-in
1101 * language types, such as mat4 and vec2, are free form. The only
1102 * requirement is that the parameters must provide enough values of the
1103 * correct scalar type. Constructors for arrays and structures must
1104 * have the exact number of parameters with matching types in the
1105 * correct order. These constructors follow essentially the same type
1106 * matching rules as functions.
1108 if (constructor_type
->is_record()) {
1109 exec_list actual_parameters
;
1111 process_parameters(instructions
, &actual_parameters
,
1112 &this->expressions
, state
);
1114 exec_node
*node
= actual_parameters
.head
;
1115 for (unsigned i
= 0; i
< constructor_type
->length
; i
++) {
1116 ir_rvalue
*ir
= (ir_rvalue
*) node
;
1118 if (node
->is_tail_sentinel()) {
1119 _mesa_glsl_error(&loc
, state
,
1120 "insufficient parameters to constructor "
1122 constructor_type
->name
);
1123 return ir_call::get_error_instruction(ctx
);
1126 if (apply_implicit_conversion(constructor_type
->fields
.structure
[i
].type
,
1128 node
->replace_with(ir
);
1130 _mesa_glsl_error(&loc
, state
,
1131 "parameter type mismatch in constructor "
1132 "for `%s.%s' (%s vs %s)",
1133 constructor_type
->name
,
1134 constructor_type
->fields
.structure
[i
].name
,
1136 constructor_type
->fields
.structure
[i
].type
->name
);
1137 return ir_call::get_error_instruction(ctx
);;
1143 if (!node
->is_tail_sentinel()) {
1144 _mesa_glsl_error(&loc
, state
, "too many parameters in constructor "
1145 "for `%s'", constructor_type
->name
);
1146 return ir_call::get_error_instruction(ctx
);
1149 ir_rvalue
*const constant
=
1150 constant_record_constructor(constructor_type
, &actual_parameters
,
1153 return (constant
!= NULL
)
1155 : emit_inline_record_constructor(constructor_type
, instructions
,
1156 &actual_parameters
, state
);
1159 if (!constructor_type
->is_numeric() && !constructor_type
->is_boolean())
1160 return ir_call::get_error_instruction(ctx
);
1162 /* Total number of components of the type being constructed. */
1163 const unsigned type_components
= constructor_type
->components();
1165 /* Number of components from parameters that have actually been
1166 * consumed. This is used to perform several kinds of error checking.
1168 unsigned components_used
= 0;
1170 unsigned matrix_parameters
= 0;
1171 unsigned nonmatrix_parameters
= 0;
1172 exec_list actual_parameters
;
1174 foreach_list (n
, &this->expressions
) {
1175 ast_node
*ast
= exec_node_data(ast_node
, n
, link
);
1176 ir_rvalue
*result
= ast
->hir(instructions
, state
)->as_rvalue();
1178 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
1180 * "It is an error to provide extra arguments beyond this
1181 * last used argument."
1183 if (components_used
>= type_components
) {
1184 _mesa_glsl_error(& loc
, state
, "too many parameters to `%s' "
1186 constructor_type
->name
);
1187 return ir_call::get_error_instruction(ctx
);
1190 if (!result
->type
->is_numeric() && !result
->type
->is_boolean()) {
1191 _mesa_glsl_error(& loc
, state
, "cannot construct `%s' from a "
1192 "non-numeric data type",
1193 constructor_type
->name
);
1194 return ir_call::get_error_instruction(ctx
);
1197 /* Count the number of matrix and nonmatrix parameters. This
1198 * is used below to enforce some of the constructor rules.
1200 if (result
->type
->is_matrix())
1201 matrix_parameters
++;
1203 nonmatrix_parameters
++;
1205 actual_parameters
.push_tail(result
);
1206 components_used
+= result
->type
->components();
1209 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
1211 * "It is an error to construct matrices from other matrices. This
1212 * is reserved for future use."
1214 if (state
->language_version
== 110 && matrix_parameters
> 0
1215 && constructor_type
->is_matrix()) {
1216 _mesa_glsl_error(& loc
, state
, "cannot construct `%s' from a "
1217 "matrix in GLSL 1.10",
1218 constructor_type
->name
);
1219 return ir_call::get_error_instruction(ctx
);
1222 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
1224 * "If a matrix argument is given to a matrix constructor, it is
1225 * an error to have any other arguments."
1227 if ((matrix_parameters
> 0)
1228 && ((matrix_parameters
+ nonmatrix_parameters
) > 1)
1229 && constructor_type
->is_matrix()) {
1230 _mesa_glsl_error(& loc
, state
, "for matrix `%s' constructor, "
1231 "matrix must be only parameter",
1232 constructor_type
->name
);
1233 return ir_call::get_error_instruction(ctx
);
1236 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
1238 * "In these cases, there must be enough components provided in the
1239 * arguments to provide an initializer for every component in the
1240 * constructed value."
1242 if (components_used
< type_components
&& components_used
!= 1
1243 && matrix_parameters
== 0) {
1244 _mesa_glsl_error(& loc
, state
, "too few components to construct "
1246 constructor_type
->name
);
1247 return ir_call::get_error_instruction(ctx
);
1250 /* Later, we cast each parameter to the same base type as the
1251 * constructor. Since there are no non-floating point matrices, we
1252 * need to break them up into a series of column vectors.
1254 if (constructor_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1255 foreach_list_safe(n
, &actual_parameters
) {
1256 ir_rvalue
*matrix
= (ir_rvalue
*) n
;
1258 if (!matrix
->type
->is_matrix())
1261 /* Create a temporary containing the matrix. */
1262 ir_variable
*var
= new(ctx
) ir_variable(matrix
->type
, "matrix_tmp",
1264 instructions
->push_tail(var
);
1265 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
)
1266 ir_dereference_variable(var
), matrix
, NULL
));
1267 var
->constant_value
= matrix
->constant_expression_value();
1269 /* Replace the matrix with dereferences of its columns. */
1270 for (int i
= 0; i
< matrix
->type
->matrix_columns
; i
++) {
1271 matrix
->insert_before(new (ctx
) ir_dereference_array(var
,
1272 new(ctx
) ir_constant(i
)));
1278 bool all_parameters_are_constant
= true;
1280 /* Type cast each parameter and, if possible, fold constants.*/
1281 foreach_list_safe(n
, &actual_parameters
) {
1282 ir_rvalue
*ir
= (ir_rvalue
*) n
;
1284 const glsl_type
*desired_type
=
1285 glsl_type::get_instance(constructor_type
->base_type
,
1286 ir
->type
->vector_elements
,
1287 ir
->type
->matrix_columns
);
1288 ir_rvalue
*result
= convert_component(ir
, desired_type
);
1290 /* Attempt to convert the parameter to a constant valued expression.
1291 * After doing so, track whether or not all the parameters to the
1292 * constructor are trivially constant valued expressions.
1294 ir_rvalue
*const constant
= result
->constant_expression_value();
1296 if (constant
!= NULL
)
1299 all_parameters_are_constant
= false;
1302 ir
->replace_with(result
);
1306 /* If all of the parameters are trivially constant, create a
1307 * constant representing the complete collection of parameters.
1309 if (all_parameters_are_constant
) {
1310 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
1311 } else if (constructor_type
->is_scalar()) {
1312 return dereference_component((ir_rvalue
*) actual_parameters
.head
,
1314 } else if (constructor_type
->is_vector()) {
1315 return emit_inline_vector_constructor(constructor_type
,
1320 assert(constructor_type
->is_matrix());
1321 return emit_inline_matrix_constructor(constructor_type
,
1327 const ast_expression
*id
= subexpressions
[0];
1328 YYLTYPE loc
= id
->get_location();
1329 exec_list actual_parameters
;
1331 process_parameters(instructions
, &actual_parameters
, &this->expressions
,
1334 return match_function_by_name(instructions
,
1335 id
->primary_expression
.identifier
, & loc
,
1336 &actual_parameters
, state
);
1339 return ir_call::get_error_instruction(ctx
);