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 Parameter list for the function. This may be either a
66 * formal or actual parameter list. Only the type is used.
69 * A talloced string representing the prototype of the function.
72 prototype_string(const glsl_type
*return_type
, const char *name
,
73 exec_list
*parameters
)
77 if (return_type
!= NULL
)
78 str
= talloc_asprintf(str
, "%s ", return_type
->name
);
80 str
= talloc_asprintf_append(str
, "%s(", name
);
82 const char *comma
= "";
83 foreach_list(node
, parameters
) {
84 const ir_instruction
*const param
= (ir_instruction
*) node
;
86 str
= talloc_asprintf_append(str
, "%s%s", comma
, param
->type
->name
);
90 str
= talloc_strdup_append(str
, ")");
96 process_call(exec_list
*instructions
, ir_function
*f
,
97 YYLTYPE
*loc
, exec_list
*actual_parameters
,
98 struct _mesa_glsl_parse_state
*state
)
102 ir_function_signature
*sig
= f
->matching_signature(actual_parameters
);
105 /* Verify that 'out' and 'inout' actual parameters are lvalues. This
106 * isn't done in ir_function::matching_signature because that function
107 * cannot generate the necessary diagnostics.
109 exec_list_iterator actual_iter
= actual_parameters
->iterator();
110 exec_list_iterator formal_iter
= sig
->parameters
.iterator();
112 while (actual_iter
.has_next()) {
113 ir_rvalue
*actual
= (ir_rvalue
*) actual_iter
.get();
114 ir_variable
*formal
= (ir_variable
*) formal_iter
.get();
116 assert(actual
!= NULL
);
117 assert(formal
!= NULL
);
119 if ((formal
->mode
== ir_var_out
)
120 || (formal
->mode
== ir_var_inout
)) {
121 if (! actual
->is_lvalue()) {
122 /* FINISHME: Log a better diagnostic here. There is no way
123 * FINISHME: to tell the user which parameter is invalid.
125 _mesa_glsl_error(loc
, state
, "`%s' parameter is not lvalue",
126 (formal
->mode
== ir_var_out
) ? "out" : "inout");
130 if (formal
->type
->is_numeric() || formal
->type
->is_boolean()) {
131 ir_rvalue
*converted
= convert_component(actual
, formal
->type
);
132 actual
->replace_with(converted
);
139 /* Always insert the call in the instruction stream, and return a deref
140 * of its return val if it returns a value, since we don't know if
141 * the rvalue is going to be assigned to anything or not.
143 ir_call
*call
= new(ctx
) ir_call(sig
, actual_parameters
);
144 if (!sig
->return_type
->is_void()) {
146 ir_dereference_variable
*deref
;
148 var
= new(ctx
) ir_variable(sig
->return_type
,
149 talloc_asprintf(ctx
, "%s_retval",
150 sig
->function_name()),
152 instructions
->push_tail(var
);
154 deref
= new(ctx
) ir_dereference_variable(var
);
155 ir_assignment
*assign
= new(ctx
) ir_assignment(deref
, call
, NULL
);
156 instructions
->push_tail(assign
);
157 if (state
->language_version
>= 120)
158 var
->constant_value
= call
->constant_expression_value();
160 deref
= new(ctx
) ir_dereference_variable(var
);
163 instructions
->push_tail(call
);
167 char *str
= prototype_string(NULL
, f
->name
, actual_parameters
);
169 _mesa_glsl_error(loc
, state
, "no matching function for call to `%s'",
173 const char *prefix
= "candidates are: ";
174 foreach_list (node
, &f
->signatures
) {
175 ir_function_signature
*sig
= (ir_function_signature
*) node
;
177 str
= prototype_string(sig
->return_type
, f
->name
, &sig
->parameters
);
178 _mesa_glsl_error(loc
, state
, "%s%s\n", prefix
, str
);
184 return ir_call::get_error_instruction(ctx
);
190 match_function_by_name(exec_list
*instructions
, const char *name
,
191 YYLTYPE
*loc
, exec_list
*actual_parameters
,
192 struct _mesa_glsl_parse_state
*state
)
195 ir_function
*f
= state
->symbols
->get_function(name
);
198 _mesa_glsl_error(loc
, state
, "function `%s' undeclared", name
);
199 return ir_call::get_error_instruction(ctx
);
202 /* Once we've determined that the function being called might exist, try
203 * to find an overload of the function that matches the parameters.
205 return process_call(instructions
, f
, loc
, actual_parameters
, state
);
210 * Perform automatic type conversion of constructor parameters
212 * This implements the rules in the "Conversion and Scalar Constructors"
213 * section (GLSL 1.10 section 5.4.1), not the "Implicit Conversions" rules.
216 convert_component(ir_rvalue
*src
, const glsl_type
*desired_type
)
218 void *ctx
= talloc_parent(src
);
219 const unsigned a
= desired_type
->base_type
;
220 const unsigned b
= src
->type
->base_type
;
221 ir_expression
*result
= NULL
;
223 if (src
->type
->is_error())
226 assert(a
<= GLSL_TYPE_BOOL
);
227 assert(b
<= GLSL_TYPE_BOOL
);
229 if ((a
== b
) || (src
->type
->is_integer() && desired_type
->is_integer()))
235 if (b
== GLSL_TYPE_FLOAT
)
236 result
= new(ctx
) ir_expression(ir_unop_f2i
, desired_type
, src
, NULL
);
238 assert(b
== GLSL_TYPE_BOOL
);
239 result
= new(ctx
) ir_expression(ir_unop_b2i
, desired_type
, src
, NULL
);
242 case GLSL_TYPE_FLOAT
:
245 result
= new(ctx
) ir_expression(ir_unop_u2f
, desired_type
, src
, NULL
);
248 result
= new(ctx
) ir_expression(ir_unop_i2f
, desired_type
, src
, NULL
);
251 result
= new(ctx
) ir_expression(ir_unop_b2f
, desired_type
, src
, NULL
);
259 result
= new(ctx
) ir_expression(ir_unop_i2b
, desired_type
, src
, NULL
);
261 case GLSL_TYPE_FLOAT
:
262 result
= new(ctx
) ir_expression(ir_unop_f2b
, desired_type
, src
, NULL
);
268 assert(result
!= NULL
);
270 /* Try constant folding; it may fold in the conversion we just added. */
271 ir_constant
*const constant
= result
->constant_expression_value();
272 return (constant
!= NULL
) ? (ir_rvalue
*) constant
: (ir_rvalue
*) result
;
276 * Dereference a specific component from a scalar, vector, or matrix
279 dereference_component(ir_rvalue
*src
, unsigned component
)
281 void *ctx
= talloc_parent(src
);
282 assert(component
< src
->type
->components());
284 /* If the source is a constant, just create a new constant instead of a
285 * dereference of the existing constant.
287 ir_constant
*constant
= src
->as_constant();
289 return new(ctx
) ir_constant(constant
, component
);
291 if (src
->type
->is_scalar()) {
293 } else if (src
->type
->is_vector()) {
294 return new(ctx
) ir_swizzle(src
, component
, 0, 0, 0, 1);
296 assert(src
->type
->is_matrix());
298 /* Dereference a row of the matrix, then call this function again to get
299 * a specific element from that row.
301 const int c
= component
/ src
->type
->column_type()->vector_elements
;
302 const int r
= component
% src
->type
->column_type()->vector_elements
;
303 ir_constant
*const col_index
= new(ctx
) ir_constant(c
);
304 ir_dereference
*const col
= new(ctx
) ir_dereference_array(src
, col_index
);
306 col
->type
= src
->type
->column_type();
308 return dereference_component(col
, r
);
311 assert(!"Should not get here.");
317 process_array_constructor(exec_list
*instructions
,
318 const glsl_type
*constructor_type
,
319 YYLTYPE
*loc
, exec_list
*parameters
,
320 struct _mesa_glsl_parse_state
*state
)
323 /* Array constructors come in two forms: sized and unsized. Sized array
324 * constructors look like 'vec4[2](a, b)', where 'a' and 'b' are vec4
325 * variables. In this case the number of parameters must exactly match the
326 * specified size of the array.
328 * Unsized array constructors look like 'vec4[](a, b)', where 'a' and 'b'
329 * are vec4 variables. In this case the size of the array being constructed
330 * is determined by the number of parameters.
332 * From page 52 (page 58 of the PDF) of the GLSL 1.50 spec:
334 * "There must be exactly the same number of arguments as the size of
335 * the array being constructed. If no size is present in the
336 * constructor, then the array is explicitly sized to the number of
337 * arguments provided. The arguments are assigned in order, starting at
338 * element 0, to the elements of the constructed array. Each argument
339 * must be the same type as the element type of the array, or be a type
340 * that can be converted to the element type of the array according to
341 * Section 4.1.10 "Implicit Conversions.""
343 exec_list actual_parameters
;
344 const unsigned parameter_count
=
345 process_parameters(instructions
, &actual_parameters
, parameters
, state
);
347 if ((parameter_count
== 0)
348 || ((constructor_type
->length
!= 0)
349 && (constructor_type
->length
!= parameter_count
))) {
350 const unsigned min_param
= (constructor_type
->length
== 0)
351 ? 1 : constructor_type
->length
;
353 _mesa_glsl_error(loc
, state
, "array constructor must have %s %u "
355 (constructor_type
->length
!= 0) ? "at least" : "exactly",
356 min_param
, (min_param
<= 1) ? "" : "s");
357 return ir_call::get_error_instruction(ctx
);
360 if (constructor_type
->length
== 0) {
362 glsl_type::get_array_instance(constructor_type
->element_type(),
364 assert(constructor_type
!= NULL
);
365 assert(constructor_type
->length
== parameter_count
);
368 bool all_parameters_are_constant
= true;
370 /* Type cast each parameter and, if possible, fold constants. */
371 foreach_list_safe(n
, &actual_parameters
) {
372 ir_rvalue
*ir
= (ir_rvalue
*) n
;
373 ir_rvalue
*result
= ir
;
375 /* Apply implicit conversions (not the scalar constructor rules!) */
376 if (constructor_type
->element_type()->is_float()) {
377 const glsl_type
*desired_type
=
378 glsl_type::get_instance(GLSL_TYPE_FLOAT
,
379 ir
->type
->vector_elements
,
380 ir
->type
->matrix_columns
);
381 result
= convert_component(ir
, desired_type
);
384 if (result
->type
!= constructor_type
->element_type()) {
385 _mesa_glsl_error(loc
, state
, "type error in array constructor: "
386 "expected: %s, found %s",
387 constructor_type
->element_type()->name
,
391 /* Attempt to convert the parameter to a constant valued expression.
392 * After doing so, track whether or not all the parameters to the
393 * constructor are trivially constant valued expressions.
395 ir_rvalue
*const constant
= result
->constant_expression_value();
397 if (constant
!= NULL
)
400 all_parameters_are_constant
= false;
402 ir
->replace_with(result
);
405 if (all_parameters_are_constant
)
406 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
408 ir_variable
*var
= new(ctx
) ir_variable(constructor_type
, "array_ctor",
410 instructions
->push_tail(var
);
413 foreach_list(node
, &actual_parameters
) {
414 ir_rvalue
*rhs
= (ir_rvalue
*) node
;
415 ir_rvalue
*lhs
= new(ctx
) ir_dereference_array(var
,
416 new(ctx
) ir_constant(i
));
418 ir_instruction
*assignment
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
419 instructions
->push_tail(assignment
);
424 return new(ctx
) ir_dereference_variable(var
);
429 * Try to convert a record constructor to a constant expression
432 constant_record_constructor(const glsl_type
*constructor_type
,
433 exec_list
*parameters
, void *mem_ctx
)
435 foreach_list(node
, parameters
) {
436 ir_constant
*constant
= ((ir_instruction
*) node
)->as_constant();
437 if (constant
== NULL
)
439 node
->replace_with(constant
);
442 return new(mem_ctx
) ir_constant(constructor_type
, parameters
);
447 * Determine if a list consists of a single scalar r-value
450 single_scalar_parameter(exec_list
*parameters
)
452 const ir_rvalue
*const p
= (ir_rvalue
*) parameters
->head
;
453 assert(((ir_rvalue
*)p
)->as_rvalue() != NULL
);
455 return (p
->type
->is_scalar() && p
->next
->is_tail_sentinel());
460 * Generate inline code for a vector constructor
462 * The generated constructor code will consist of a temporary variable
463 * declaration of the same type as the constructor. A sequence of assignments
464 * from constructor parameters to the temporary will follow.
467 * An \c ir_dereference_variable of the temprorary generated in the constructor
471 emit_inline_vector_constructor(const glsl_type
*type
,
472 exec_list
*instructions
,
473 exec_list
*parameters
,
476 assert(!parameters
->is_empty());
478 ir_variable
*var
= new(ctx
) ir_variable(type
, "vec_ctor", ir_var_temporary
);
479 instructions
->push_tail(var
);
481 /* There are two kinds of vector constructors.
483 * - Construct a vector from a single scalar by replicating that scalar to
484 * all components of the vector.
486 * - Construct a vector from an arbirary combination of vectors and
487 * scalars. The components of the constructor parameters are assigned
488 * to the vector in order until the vector is full.
490 const unsigned lhs_components
= type
->components();
491 if (single_scalar_parameter(parameters
)) {
492 ir_rvalue
*first_param
= (ir_rvalue
*)parameters
->head
;
493 ir_rvalue
*rhs
= new(ctx
) ir_swizzle(first_param
, 0, 0, 0, 0,
495 ir_dereference_variable
*lhs
= new(ctx
) ir_dereference_variable(var
);
496 const unsigned mask
= (1U << lhs_components
) - 1;
498 assert(rhs
->type
== lhs
->type
);
500 ir_instruction
*inst
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
, mask
);
501 instructions
->push_tail(inst
);
503 unsigned base_component
= 0;
504 unsigned base_lhs_component
= 0;
505 ir_constant_data data
;
506 unsigned constant_mask
= 0, constant_components
= 0;
508 memset(&data
, 0, sizeof(data
));
510 foreach_list(node
, parameters
) {
511 ir_rvalue
*param
= (ir_rvalue
*) node
;
512 unsigned rhs_components
= param
->type
->components();
514 /* Do not try to assign more components to the vector than it has!
516 if ((rhs_components
+ base_lhs_component
) > lhs_components
) {
517 rhs_components
= lhs_components
- base_lhs_component
;
520 const ir_constant
*const c
= param
->as_constant();
522 for (unsigned i
= 0; i
< rhs_components
; i
++) {
523 switch (c
->type
->base_type
) {
525 data
.u
[i
+ base_component
] = c
->get_uint_component(i
);
528 data
.i
[i
+ base_component
] = c
->get_int_component(i
);
530 case GLSL_TYPE_FLOAT
:
531 data
.f
[i
+ base_component
] = c
->get_float_component(i
);
534 data
.b
[i
+ base_component
] = c
->get_bool_component(i
);
537 assert(!"Should not get here.");
542 /* Mask of fields to be written in the assignment.
544 constant_mask
|= ((1U << rhs_components
) - 1) << base_lhs_component
;
545 constant_components
+= rhs_components
;
547 base_component
+= rhs_components
;
549 /* Advance the component index by the number of components
550 * that were just assigned.
552 base_lhs_component
+= rhs_components
;
555 if (constant_mask
!= 0) {
556 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
557 const glsl_type
*rhs_type
= glsl_type::get_instance(var
->type
->base_type
,
560 ir_rvalue
*rhs
= new(ctx
) ir_constant(rhs_type
, &data
);
562 ir_instruction
*inst
=
563 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, constant_mask
);
564 instructions
->push_tail(inst
);
568 foreach_list(node
, parameters
) {
569 ir_rvalue
*param
= (ir_rvalue
*) node
;
570 unsigned rhs_components
= param
->type
->components();
572 /* Do not try to assign more components to the vector than it has!
574 if ((rhs_components
+ base_component
) > lhs_components
) {
575 rhs_components
= lhs_components
- base_component
;
578 const ir_constant
*const c
= param
->as_constant();
580 /* Generate a swizzle in case rhs_components != rhs->type->vector_elements. */
581 unsigned swiz
[4] = { 0, 0, 0, 0 };
582 for (unsigned i
= 0; i
< rhs_components
; i
++)
585 /* Mask of fields to be written in the assignment.
587 const unsigned write_mask
= ((1U << rhs_components
) - 1)
590 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
591 ir_rvalue
*rhs
= new(ctx
) ir_swizzle(param
, swiz
, rhs_components
);
593 ir_instruction
*inst
=
594 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, write_mask
);
595 instructions
->push_tail(inst
);
598 /* Advance the component index by the number of components that were
601 base_component
+= rhs_components
;
604 return new(ctx
) ir_dereference_variable(var
);
609 * Generate assignment of a portion of a vector to a portion of a matrix column
611 * \param src_base First component of the source to be used in assignment
612 * \param column Column of destination to be assiged
613 * \param row_base First component of the destination column to be assigned
614 * \param count Number of components to be assigned
617 * \c src_base + \c count must be less than or equal to the number of components
618 * in the source vector.
621 assign_to_matrix_column(ir_variable
*var
, unsigned column
, unsigned row_base
,
622 ir_rvalue
*src
, unsigned src_base
, unsigned count
,
625 ir_constant
*col_idx
= new(mem_ctx
) ir_constant(column
);
626 ir_dereference
*column_ref
= new(mem_ctx
) ir_dereference_array(var
, col_idx
);
628 assert(column_ref
->type
->components() >= (row_base
+ count
));
629 assert(src
->type
->components() >= (src_base
+ count
));
631 /* Generate a swizzle that puts the first element of the source at the
632 * location of the first element of the destination.
634 unsigned swiz
[4] = { src_base
, src_base
, src_base
, src_base
};
635 for (unsigned i
= 0; i
< count
; i
++)
636 swiz
[i
+ row_base
] = i
;
638 ir_rvalue
*const rhs
=
639 new(mem_ctx
) ir_swizzle(src
, swiz
, count
);
641 /* Mask of fields to be written in the assignment.
643 const unsigned write_mask
= ((1U << count
) - 1) << row_base
;
645 return new(mem_ctx
) ir_assignment(column_ref
, rhs
, NULL
, write_mask
);
650 * Generate inline code for a matrix constructor
652 * The generated constructor code will consist of a temporary variable
653 * declaration of the same type as the constructor. A sequence of assignments
654 * from constructor parameters to the temporary will follow.
657 * An \c ir_dereference_variable of the temprorary generated in the constructor
661 emit_inline_matrix_constructor(const glsl_type
*type
,
662 exec_list
*instructions
,
663 exec_list
*parameters
,
666 assert(!parameters
->is_empty());
668 ir_variable
*var
= new(ctx
) ir_variable(type
, "mat_ctor", ir_var_temporary
);
669 instructions
->push_tail(var
);
671 /* There are three kinds of matrix constructors.
673 * - Construct a matrix from a single scalar by replicating that scalar to
674 * along the diagonal of the matrix and setting all other components to
677 * - Construct a matrix from an arbirary combination of vectors and
678 * scalars. The components of the constructor parameters are assigned
679 * to the matrix in colum-major order until the matrix is full.
681 * - Construct a matrix from a single matrix. The source matrix is copied
682 * to the upper left portion of the constructed matrix, and the remaining
683 * elements take values from the identity matrix.
685 ir_rvalue
*const first_param
= (ir_rvalue
*) parameters
->head
;
686 if (single_scalar_parameter(parameters
)) {
687 /* Assign the scalar to the X component of a vec4, and fill the remaining
688 * components with zero.
690 ir_variable
*rhs_var
=
691 new(ctx
) ir_variable(glsl_type::vec4_type
, "mat_ctor_vec",
693 instructions
->push_tail(rhs_var
);
695 ir_constant_data zero
;
701 ir_instruction
*inst
=
702 new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(rhs_var
),
703 new(ctx
) ir_constant(rhs_var
->type
, &zero
),
705 instructions
->push_tail(inst
);
707 ir_dereference
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
709 inst
= new(ctx
) ir_assignment(rhs_ref
, first_param
, NULL
, 0x01);
710 instructions
->push_tail(inst
);
712 /* Assign the temporary vector to each column of the destination matrix
713 * with a swizzle that puts the X component on the diagonal of the
714 * matrix. In some cases this may mean that the X component does not
715 * get assigned into the column at all (i.e., when the matrix has more
716 * columns than rows).
718 static const unsigned rhs_swiz
[4][4] = {
725 const unsigned cols_to_init
= MIN2(type
->matrix_columns
,
726 type
->vector_elements
);
727 for (unsigned i
= 0; i
< cols_to_init
; i
++) {
728 ir_constant
*const col_idx
= new(ctx
) ir_constant(i
);
729 ir_rvalue
*const col_ref
= new(ctx
) ir_dereference_array(var
, col_idx
);
731 ir_rvalue
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
732 ir_rvalue
*const rhs
= new(ctx
) ir_swizzle(rhs_ref
, rhs_swiz
[i
],
733 type
->vector_elements
);
735 inst
= new(ctx
) ir_assignment(col_ref
, rhs
, NULL
);
736 instructions
->push_tail(inst
);
739 for (unsigned i
= cols_to_init
; i
< type
->matrix_columns
; i
++) {
740 ir_constant
*const col_idx
= new(ctx
) ir_constant(i
);
741 ir_rvalue
*const col_ref
= new(ctx
) ir_dereference_array(var
, col_idx
);
743 ir_rvalue
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
744 ir_rvalue
*const rhs
= new(ctx
) ir_swizzle(rhs_ref
, 1, 1, 1, 1,
745 type
->vector_elements
);
747 inst
= new(ctx
) ir_assignment(col_ref
, rhs
, NULL
);
748 instructions
->push_tail(inst
);
750 } else if (first_param
->type
->is_matrix()) {
751 /* From page 50 (56 of the PDF) of the GLSL 1.50 spec:
753 * "If a matrix is constructed from a matrix, then each component
754 * (column i, row j) in the result that has a corresponding
755 * component (column i, row j) in the argument will be initialized
756 * from there. All other components will be initialized to the
757 * identity matrix. If a matrix argument is given to a matrix
758 * constructor, it is an error to have any other arguments."
760 assert(first_param
->next
->is_tail_sentinel());
761 ir_rvalue
*const src_matrix
= first_param
;
763 /* If the source matrix is smaller, pre-initialize the relavent parts of
764 * the destination matrix to the identity matrix.
766 if ((src_matrix
->type
->matrix_columns
< var
->type
->matrix_columns
)
767 || (src_matrix
->type
->vector_elements
< var
->type
->vector_elements
)) {
769 /* If the source matrix has fewer rows, every column of the destination
770 * must be initialized. Otherwise only the columns in the destination
771 * that do not exist in the source must be initialized.
774 (src_matrix
->type
->vector_elements
< var
->type
->vector_elements
)
775 ? 0 : src_matrix
->type
->matrix_columns
;
777 const glsl_type
*const col_type
= var
->type
->column_type();
778 for (/* empty */; col
< var
->type
->matrix_columns
; col
++) {
779 ir_constant_data ident
;
788 ir_rvalue
*const rhs
= new(ctx
) ir_constant(col_type
, &ident
);
790 ir_rvalue
*const lhs
=
791 new(ctx
) ir_dereference_array(var
, new(ctx
) ir_constant(col
));
793 ir_instruction
*inst
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
794 instructions
->push_tail(inst
);
798 /* Assign columns from the source matrix to the destination matrix.
800 * Since the parameter will be used in the RHS of multiple assignments,
801 * generate a temporary and copy the paramter there.
803 ir_variable
*const rhs_var
=
804 new(ctx
) ir_variable(first_param
->type
, "mat_ctor_mat",
806 instructions
->push_tail(rhs_var
);
808 ir_dereference
*const rhs_var_ref
=
809 new(ctx
) ir_dereference_variable(rhs_var
);
810 ir_instruction
*const inst
=
811 new(ctx
) ir_assignment(rhs_var_ref
, first_param
, NULL
);
812 instructions
->push_tail(inst
);
814 const unsigned last_row
= MIN2(src_matrix
->type
->vector_elements
,
815 var
->type
->vector_elements
);
816 const unsigned last_col
= MIN2(src_matrix
->type
->matrix_columns
,
817 var
->type
->matrix_columns
);
819 unsigned swiz
[4] = { 0, 0, 0, 0 };
820 for (unsigned i
= 1; i
< last_row
; i
++)
823 const unsigned write_mask
= (1U << last_row
) - 1;
825 for (unsigned i
= 0; i
< last_col
; i
++) {
826 ir_dereference
*const lhs
=
827 new(ctx
) ir_dereference_array(var
, new(ctx
) ir_constant(i
));
828 ir_rvalue
*const rhs_col
=
829 new(ctx
) ir_dereference_array(rhs_var
, new(ctx
) ir_constant(i
));
831 /* If one matrix has columns that are smaller than the columns of the
832 * other matrix, wrap the column access of the larger with a swizzle
833 * so that the LHS and RHS of the assignment have the same size (and
834 * therefore have the same type).
836 * It would be perfectly valid to unconditionally generate the
837 * swizzles, this this will typically result in a more compact IR tree.
840 if (lhs
->type
->vector_elements
!= rhs_col
->type
->vector_elements
) {
841 rhs
= new(ctx
) ir_swizzle(rhs_col
, swiz
, last_row
);
846 ir_instruction
*inst
=
847 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, write_mask
);
848 instructions
->push_tail(inst
);
851 const unsigned cols
= type
->matrix_columns
;
852 const unsigned rows
= type
->vector_elements
;
853 unsigned col_idx
= 0;
854 unsigned row_idx
= 0;
856 foreach_list (node
, parameters
) {
857 ir_rvalue
*const rhs
= (ir_rvalue
*) node
;
858 const unsigned components_remaining_this_column
= rows
- row_idx
;
859 unsigned rhs_components
= rhs
->type
->components();
860 unsigned rhs_base
= 0;
862 /* Since the parameter might be used in the RHS of two assignments,
863 * generate a temporary and copy the paramter there.
865 ir_variable
*rhs_var
=
866 new(ctx
) ir_variable(rhs
->type
, "mat_ctor_vec", ir_var_temporary
);
867 instructions
->push_tail(rhs_var
);
869 ir_dereference
*rhs_var_ref
=
870 new(ctx
) ir_dereference_variable(rhs_var
);
871 ir_instruction
*inst
= new(ctx
) ir_assignment(rhs_var_ref
, rhs
, NULL
);
872 instructions
->push_tail(inst
);
874 /* Assign the current parameter to as many components of the matrix
877 * NOTE: A single vector parameter can span two matrix columns. A
878 * single vec4, for example, can completely fill a mat2.
880 if (rhs_components
>= components_remaining_this_column
) {
881 const unsigned count
= MIN2(rhs_components
,
882 components_remaining_this_column
);
884 rhs_var_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
886 ir_instruction
*inst
= assign_to_matrix_column(var
, col_idx
,
890 instructions
->push_tail(inst
);
898 /* If there is data left in the parameter and components left to be
899 * set in the destination, emit another assignment. It is possible
900 * that the assignment could be of a vec4 to the last element of the
901 * matrix. In this case col_idx==cols, but there is still data
902 * left in the source parameter. Obviously, don't emit an assignment
903 * to data outside the destination matrix.
905 if ((col_idx
< cols
) && (rhs_base
< rhs_components
)) {
906 const unsigned count
= rhs_components
- rhs_base
;
908 rhs_var_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
910 ir_instruction
*inst
= assign_to_matrix_column(var
, col_idx
,
915 instructions
->push_tail(inst
);
922 return new(ctx
) ir_dereference_variable(var
);
927 emit_inline_record_constructor(const glsl_type
*type
,
928 exec_list
*instructions
,
929 exec_list
*parameters
,
932 ir_variable
*const var
=
933 new(mem_ctx
) ir_variable(type
, "record_ctor", ir_var_temporary
);
934 ir_dereference_variable
*const d
= new(mem_ctx
) ir_dereference_variable(var
);
936 instructions
->push_tail(var
);
938 exec_node
*node
= parameters
->head
;
939 for (unsigned i
= 0; i
< type
->length
; i
++) {
940 assert(!node
->is_tail_sentinel());
942 ir_dereference
*const lhs
=
943 new(mem_ctx
) ir_dereference_record(d
->clone(mem_ctx
, NULL
),
944 type
->fields
.structure
[i
].name
);
946 ir_rvalue
*const rhs
= ((ir_instruction
*) node
)->as_rvalue();
949 ir_instruction
*const assign
= new(mem_ctx
) ir_assignment(lhs
, rhs
, NULL
);
951 instructions
->push_tail(assign
);
960 ast_function_expression::hir(exec_list
*instructions
,
961 struct _mesa_glsl_parse_state
*state
)
964 /* There are three sorts of function calls.
966 * 1. constructors - The first subexpression is an ast_type_specifier.
967 * 2. methods - Only the .length() method of array types.
968 * 3. functions - Calls to regular old functions.
970 * Method calls are actually detected when the ast_field_selection
971 * expression is handled.
973 if (is_constructor()) {
974 const ast_type_specifier
*type
= (ast_type_specifier
*) subexpressions
[0];
975 YYLTYPE loc
= type
->get_location();
978 const glsl_type
*const constructor_type
= type
->glsl_type(& name
, state
);
981 /* Constructors for samplers are illegal.
983 if (constructor_type
->is_sampler()) {
984 _mesa_glsl_error(& loc
, state
, "cannot construct sampler type `%s'",
985 constructor_type
->name
);
986 return ir_call::get_error_instruction(ctx
);
989 if (constructor_type
->is_array()) {
990 if (state
->language_version
<= 110) {
991 _mesa_glsl_error(& loc
, state
,
992 "array constructors forbidden in GLSL 1.10");
993 return ir_call::get_error_instruction(ctx
);
996 return process_array_constructor(instructions
, constructor_type
,
997 & loc
, &this->expressions
, state
);
1001 /* There are two kinds of constructor call. Constructors for built-in
1002 * language types, such as mat4 and vec2, are free form. The only
1003 * requirement is that the parameters must provide enough values of the
1004 * correct scalar type. Constructors for arrays and structures must
1005 * have the exact number of parameters with matching types in the
1006 * correct order. These constructors follow essentially the same type
1007 * matching rules as functions.
1009 if (!constructor_type
->is_numeric() && !constructor_type
->is_boolean())
1010 return ir_call::get_error_instruction(ctx
);
1012 /* Total number of components of the type being constructed. */
1013 const unsigned type_components
= constructor_type
->components();
1015 /* Number of components from parameters that have actually been
1016 * consumed. This is used to perform several kinds of error checking.
1018 unsigned components_used
= 0;
1020 unsigned matrix_parameters
= 0;
1021 unsigned nonmatrix_parameters
= 0;
1022 exec_list actual_parameters
;
1024 foreach_list (n
, &this->expressions
) {
1025 ast_node
*ast
= exec_node_data(ast_node
, n
, link
);
1026 ir_rvalue
*result
= ast
->hir(instructions
, state
)->as_rvalue();
1028 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
1030 * "It is an error to provide extra arguments beyond this
1031 * last used argument."
1033 if (components_used
>= type_components
) {
1034 _mesa_glsl_error(& loc
, state
, "too many parameters to `%s' "
1036 constructor_type
->name
);
1037 return ir_call::get_error_instruction(ctx
);
1040 if (!result
->type
->is_numeric() && !result
->type
->is_boolean()) {
1041 _mesa_glsl_error(& loc
, state
, "cannot construct `%s' from a "
1042 "non-numeric data type",
1043 constructor_type
->name
);
1044 return ir_call::get_error_instruction(ctx
);
1047 /* Count the number of matrix and nonmatrix parameters. This
1048 * is used below to enforce some of the constructor rules.
1050 if (result
->type
->is_matrix())
1051 matrix_parameters
++;
1053 nonmatrix_parameters
++;
1055 actual_parameters
.push_tail(result
);
1056 components_used
+= result
->type
->components();
1059 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
1061 * "It is an error to construct matrices from other matrices. This
1062 * is reserved for future use."
1064 if (state
->language_version
== 110 && matrix_parameters
> 0
1065 && constructor_type
->is_matrix()) {
1066 _mesa_glsl_error(& loc
, state
, "cannot construct `%s' from a "
1067 "matrix in GLSL 1.10",
1068 constructor_type
->name
);
1069 return ir_call::get_error_instruction(ctx
);
1072 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
1074 * "If a matrix argument is given to a matrix constructor, it is
1075 * an error to have any other arguments."
1077 if ((matrix_parameters
> 0)
1078 && ((matrix_parameters
+ nonmatrix_parameters
) > 1)
1079 && constructor_type
->is_matrix()) {
1080 _mesa_glsl_error(& loc
, state
, "for matrix `%s' constructor, "
1081 "matrix must be only parameter",
1082 constructor_type
->name
);
1083 return ir_call::get_error_instruction(ctx
);
1086 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
1088 * "In these cases, there must be enough components provided in the
1089 * arguments to provide an initializer for every component in the
1090 * constructed value."
1092 if (components_used
< type_components
&& components_used
!= 1
1093 && matrix_parameters
== 0) {
1094 _mesa_glsl_error(& loc
, state
, "too few components to construct "
1096 constructor_type
->name
);
1097 return ir_call::get_error_instruction(ctx
);
1100 /* Later, we cast each parameter to the same base type as the
1101 * constructor. Since there are no non-floating point matrices, we
1102 * need to break them up into a series of column vectors.
1104 if (constructor_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1105 foreach_list_safe(n
, &actual_parameters
) {
1106 ir_rvalue
*matrix
= (ir_rvalue
*) n
;
1108 if (!matrix
->type
->is_matrix())
1111 /* Create a temporary containing the matrix. */
1112 ir_variable
*var
= new(ctx
) ir_variable(matrix
->type
, "matrix_tmp",
1114 instructions
->push_tail(var
);
1115 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
)
1116 ir_dereference_variable(var
), matrix
, NULL
));
1117 var
->constant_value
= matrix
->constant_expression_value();
1119 /* Replace the matrix with dereferences of its columns. */
1120 for (int i
= 0; i
< matrix
->type
->matrix_columns
; i
++) {
1121 matrix
->insert_before(new (ctx
) ir_dereference_array(var
,
1122 new(ctx
) ir_constant(i
)));
1128 bool all_parameters_are_constant
= true;
1130 /* Type cast each parameter and, if possible, fold constants.*/
1131 foreach_list_safe(n
, &actual_parameters
) {
1132 ir_rvalue
*ir
= (ir_rvalue
*) n
;
1134 const glsl_type
*desired_type
=
1135 glsl_type::get_instance(constructor_type
->base_type
,
1136 ir
->type
->vector_elements
,
1137 ir
->type
->matrix_columns
);
1138 ir_rvalue
*result
= convert_component(ir
, desired_type
);
1140 /* Attempt to convert the parameter to a constant valued expression.
1141 * After doing so, track whether or not all the parameters to the
1142 * constructor are trivially constant valued expressions.
1144 ir_rvalue
*const constant
= result
->constant_expression_value();
1146 if (constant
!= NULL
)
1149 all_parameters_are_constant
= false;
1152 ir
->replace_with(result
);
1156 /* If all of the parameters are trivially constant, create a
1157 * constant representing the complete collection of parameters.
1159 if (all_parameters_are_constant
) {
1160 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
1161 } else if (constructor_type
->is_scalar()) {
1162 return dereference_component((ir_rvalue
*) actual_parameters
.head
,
1164 } else if (constructor_type
->is_vector()) {
1165 return emit_inline_vector_constructor(constructor_type
,
1170 assert(constructor_type
->is_matrix());
1171 return emit_inline_matrix_constructor(constructor_type
,
1177 const ast_expression
*id
= subexpressions
[0];
1178 YYLTYPE loc
= id
->get_location();
1179 exec_list actual_parameters
;
1181 process_parameters(instructions
, &actual_parameters
, &this->expressions
,
1184 const glsl_type
*const type
=
1185 state
->symbols
->get_type(id
->primary_expression
.identifier
);
1187 if ((type
!= NULL
) && type
->is_record()) {
1188 exec_node
*node
= actual_parameters
.head
;
1189 for (unsigned i
= 0; i
< type
->length
; i
++) {
1190 ir_rvalue
*ir
= (ir_rvalue
*) node
;
1192 if (node
->is_tail_sentinel()) {
1193 _mesa_glsl_error(&loc
, state
,
1194 "insufficient parameters to constructor "
1197 return ir_call::get_error_instruction(ctx
);
1200 if (apply_implicit_conversion(type
->fields
.structure
[i
].type
, ir
,
1202 node
->replace_with(ir
);
1204 _mesa_glsl_error(&loc
, state
,
1205 "parameter type mismatch in constructor "
1206 "for `%s.%s' (%s vs %s)",
1208 type
->fields
.structure
[i
].name
,
1210 type
->fields
.structure
[i
].type
->name
);
1211 return ir_call::get_error_instruction(ctx
);;
1217 if (!node
->is_tail_sentinel()) {
1218 _mesa_glsl_error(&loc
, state
, "too many parameters in constructor "
1219 "for `%s'", type
->name
);
1220 return ir_call::get_error_instruction(ctx
);
1223 ir_rvalue
*const constant
=
1224 constant_record_constructor(type
, &actual_parameters
, state
);
1226 return (constant
!= NULL
)
1228 : emit_inline_record_constructor(type
, instructions
,
1229 &actual_parameters
, state
);
1232 return match_function_by_name(instructions
,
1233 id
->primary_expression
.identifier
, & loc
,
1234 &actual_parameters
, state
);
1237 return ir_call::get_error_instruction(ctx
);