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 */
29 #include "main/shaderobj.h"
32 convert_component(ir_rvalue
*src
, const glsl_type
*desired_type
);
35 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
36 struct _mesa_glsl_parse_state
*state
);
39 process_parameters(exec_list
*instructions
, exec_list
*actual_parameters
,
40 exec_list
*parameters
,
41 struct _mesa_glsl_parse_state
*state
)
45 foreach_list_typed(ast_node
, ast
, link
, parameters
) {
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_in_list(const ir_variable
, param
, parameters
) {
86 ralloc_asprintf_append(&str
, "%s%s", comma
, param
->type
->name
);
90 ralloc_strcat(&str
, ")");
95 verify_image_parameter(YYLTYPE
*loc
, _mesa_glsl_parse_state
*state
,
96 const ir_variable
*formal
, const ir_variable
*actual
)
99 * From the ARB_shader_image_load_store specification:
101 * "The values of image variables qualified with coherent,
102 * volatile, restrict, readonly, or writeonly may not be passed
103 * to functions whose formal parameters lack such
104 * qualifiers. [...] It is legal to have additional qualifiers
105 * on a formal parameter, but not to have fewer."
107 if (actual
->data
.image_coherent
&& !formal
->data
.image_coherent
) {
108 _mesa_glsl_error(loc
, state
,
109 "function call parameter `%s' drops "
110 "`coherent' qualifier", formal
->name
);
114 if (actual
->data
.image_volatile
&& !formal
->data
.image_volatile
) {
115 _mesa_glsl_error(loc
, state
,
116 "function call parameter `%s' drops "
117 "`volatile' qualifier", formal
->name
);
121 if (actual
->data
.image_restrict
&& !formal
->data
.image_restrict
) {
122 _mesa_glsl_error(loc
, state
,
123 "function call parameter `%s' drops "
124 "`restrict' qualifier", formal
->name
);
128 if (actual
->data
.image_read_only
&& !formal
->data
.image_read_only
) {
129 _mesa_glsl_error(loc
, state
,
130 "function call parameter `%s' drops "
131 "`readonly' qualifier", formal
->name
);
135 if (actual
->data
.image_write_only
&& !formal
->data
.image_write_only
) {
136 _mesa_glsl_error(loc
, state
,
137 "function call parameter `%s' drops "
138 "`writeonly' qualifier", formal
->name
);
146 verify_first_atomic_parameter(YYLTYPE
*loc
, _mesa_glsl_parse_state
*state
,
150 (!var
->is_in_shader_storage_block() &&
151 var
->data
.mode
!= ir_var_shader_shared
)) {
152 _mesa_glsl_error(loc
, state
, "First argument to atomic function "
153 "must be a buffer or shared variable");
160 is_atomic_function(const char *func_name
)
162 return !strcmp(func_name
, "atomicAdd") ||
163 !strcmp(func_name
, "atomicMin") ||
164 !strcmp(func_name
, "atomicMax") ||
165 !strcmp(func_name
, "atomicAnd") ||
166 !strcmp(func_name
, "atomicOr") ||
167 !strcmp(func_name
, "atomicXor") ||
168 !strcmp(func_name
, "atomicExchange") ||
169 !strcmp(func_name
, "atomicCompSwap");
173 * Verify that 'out' and 'inout' actual parameters are lvalues. Also, verify
174 * that 'const_in' formal parameters (an extension in our IR) correspond to
175 * ir_constant actual parameters.
178 verify_parameter_modes(_mesa_glsl_parse_state
*state
,
179 ir_function_signature
*sig
,
180 exec_list
&actual_ir_parameters
,
181 exec_list
&actual_ast_parameters
)
183 exec_node
*actual_ir_node
= actual_ir_parameters
.head
;
184 exec_node
*actual_ast_node
= actual_ast_parameters
.head
;
186 foreach_in_list(const ir_variable
, formal
, &sig
->parameters
) {
187 /* The lists must be the same length. */
188 assert(!actual_ir_node
->is_tail_sentinel());
189 assert(!actual_ast_node
->is_tail_sentinel());
191 const ir_rvalue
*const actual
= (ir_rvalue
*) actual_ir_node
;
192 const ast_expression
*const actual_ast
=
193 exec_node_data(ast_expression
, actual_ast_node
, link
);
195 /* FIXME: 'loc' is incorrect (as of 2011-01-21). It is always
198 YYLTYPE loc
= actual_ast
->get_location();
200 /* Verify that 'const_in' parameters are ir_constants. */
201 if (formal
->data
.mode
== ir_var_const_in
&&
202 actual
->ir_type
!= ir_type_constant
) {
203 _mesa_glsl_error(&loc
, state
,
204 "parameter `in %s' must be a constant expression",
209 /* Verify that shader_in parameters are shader inputs */
210 if (formal
->data
.must_be_shader_input
) {
211 ir_variable
*var
= actual
->variable_referenced();
212 if (var
&& var
->data
.mode
!= ir_var_shader_in
) {
213 _mesa_glsl_error(&loc
, state
,
214 "parameter `%s` must be a shader input",
219 if (actual
->ir_type
== ir_type_swizzle
) {
220 _mesa_glsl_error(&loc
, state
,
221 "parameter `%s` must not be swizzled",
227 /* Verify that 'out' and 'inout' actual parameters are lvalues. */
228 if (formal
->data
.mode
== ir_var_function_out
229 || formal
->data
.mode
== ir_var_function_inout
) {
230 const char *mode
= NULL
;
231 switch (formal
->data
.mode
) {
232 case ir_var_function_out
: mode
= "out"; break;
233 case ir_var_function_inout
: mode
= "inout"; break;
234 default: assert(false); break;
237 /* This AST-based check catches errors like f(i++). The IR-based
238 * is_lvalue() is insufficient because the actual parameter at the
239 * IR-level is just a temporary value, which is an l-value.
241 if (actual_ast
->non_lvalue_description
!= NULL
) {
242 _mesa_glsl_error(&loc
, state
,
243 "function parameter '%s %s' references a %s",
245 actual_ast
->non_lvalue_description
);
249 ir_variable
*var
= actual
->variable_referenced();
251 var
->data
.assigned
= true;
253 if (var
&& var
->data
.read_only
) {
254 _mesa_glsl_error(&loc
, state
,
255 "function parameter '%s %s' references the "
256 "read-only variable '%s'",
258 actual
->variable_referenced()->name
);
260 } else if (!actual
->is_lvalue()) {
261 _mesa_glsl_error(&loc
, state
,
262 "function parameter '%s %s' is not an lvalue",
268 if (formal
->type
->is_image() &&
269 actual
->variable_referenced()) {
270 if (!verify_image_parameter(&loc
, state
, formal
,
271 actual
->variable_referenced()))
275 actual_ir_node
= actual_ir_node
->next
;
276 actual_ast_node
= actual_ast_node
->next
;
279 /* The first parameter of atomic functions must be a buffer variable */
280 const char *func_name
= sig
->function_name();
281 bool is_atomic
= is_atomic_function(func_name
);
283 const ir_rvalue
*const actual
= (ir_rvalue
*) actual_ir_parameters
.head
;
285 const ast_expression
*const actual_ast
=
286 exec_node_data(ast_expression
, actual_ast_parameters
.head
, link
);
287 YYLTYPE loc
= actual_ast
->get_location();
289 if (!verify_first_atomic_parameter(&loc
, state
,
290 actual
->variable_referenced())) {
299 fix_parameter(void *mem_ctx
, ir_rvalue
*actual
, const glsl_type
*formal_type
,
300 exec_list
*before_instructions
, exec_list
*after_instructions
,
301 bool parameter_is_inout
)
303 ir_expression
*const expr
= actual
->as_expression();
305 /* If the types match exactly and the parameter is not a vector-extract,
306 * nothing needs to be done to fix the parameter.
308 if (formal_type
== actual
->type
309 && (expr
== NULL
|| expr
->operation
!= ir_binop_vector_extract
))
312 /* To convert an out parameter, we need to create a temporary variable to
313 * hold the value before conversion, and then perform the conversion after
314 * the function call returns.
316 * This has the effect of transforming code like this:
322 * Into IR that's equivalent to this:
326 * int out_parameter_conversion;
327 * f(out_parameter_conversion);
328 * value = float(out_parameter_conversion);
330 * If the parameter is an ir_expression of ir_binop_vector_extract,
331 * additional conversion is needed in the post-call re-write.
334 new(mem_ctx
) ir_variable(formal_type
, "inout_tmp", ir_var_temporary
);
336 before_instructions
->push_tail(tmp
);
338 /* If the parameter is an inout parameter, copy the value of the actual
339 * parameter to the new temporary. Note that no type conversion is allowed
340 * here because inout parameters must match types exactly.
342 if (parameter_is_inout
) {
343 /* Inout parameters should never require conversion, since that would
344 * require an implicit conversion to exist both to and from the formal
345 * parameter type, and there are no bidirectional implicit conversions.
347 assert (actual
->type
== formal_type
);
349 ir_dereference_variable
*const deref_tmp_1
=
350 new(mem_ctx
) ir_dereference_variable(tmp
);
351 ir_assignment
*const assignment
=
352 new(mem_ctx
) ir_assignment(deref_tmp_1
, actual
);
353 before_instructions
->push_tail(assignment
);
356 /* Replace the parameter in the call with a dereference of the new
359 ir_dereference_variable
*const deref_tmp_2
=
360 new(mem_ctx
) ir_dereference_variable(tmp
);
361 actual
->replace_with(deref_tmp_2
);
364 /* Copy the temporary variable to the actual parameter with optional
365 * type conversion applied.
367 ir_rvalue
*rhs
= new(mem_ctx
) ir_dereference_variable(tmp
);
368 if (actual
->type
!= formal_type
)
369 rhs
= convert_component(rhs
, actual
->type
);
371 ir_rvalue
*lhs
= actual
;
372 if (expr
!= NULL
&& expr
->operation
== ir_binop_vector_extract
) {
373 lhs
= new(mem_ctx
) ir_dereference_array(expr
->operands
[0]->clone(mem_ctx
, NULL
),
374 expr
->operands
[1]->clone(mem_ctx
, NULL
));
377 ir_assignment
*const assignment_2
= new(mem_ctx
) ir_assignment(lhs
, rhs
);
378 after_instructions
->push_tail(assignment_2
);
382 * Generate a function call.
384 * For non-void functions, this returns a dereference of the temporary variable
385 * which stores the return value for the call. For void functions, this returns
389 generate_call(exec_list
*instructions
, ir_function_signature
*sig
,
390 exec_list
*actual_parameters
,
391 ir_variable
*sub_var
,
392 ir_rvalue
*array_idx
,
393 struct _mesa_glsl_parse_state
*state
)
396 exec_list post_call_conversions
;
398 /* Perform implicit conversion of arguments. For out parameters, we need
399 * to place them in a temporary variable and do the conversion after the
400 * call takes place. Since we haven't emitted the call yet, we'll place
401 * the post-call conversions in a temporary exec_list, and emit them later.
403 foreach_two_lists(formal_node
, &sig
->parameters
,
404 actual_node
, actual_parameters
) {
405 ir_rvalue
*actual
= (ir_rvalue
*) actual_node
;
406 ir_variable
*formal
= (ir_variable
*) formal_node
;
408 if (formal
->type
->is_numeric() || formal
->type
->is_boolean()) {
409 switch (formal
->data
.mode
) {
410 case ir_var_const_in
:
411 case ir_var_function_in
: {
413 = convert_component(actual
, formal
->type
);
414 actual
->replace_with(converted
);
417 case ir_var_function_out
:
418 case ir_var_function_inout
:
419 fix_parameter(ctx
, actual
, formal
->type
,
420 instructions
, &post_call_conversions
,
421 formal
->data
.mode
== ir_var_function_inout
);
424 assert (!"Illegal formal parameter mode");
430 /* Section 4.3.2 (Const) of the GLSL 1.10.59 spec says:
432 * "Initializers for const declarations must be formed from literal
433 * values, other const variables (not including function call
434 * paramaters), or expressions of these.
436 * Constructors may be used in such expressions, but function calls may
439 * Section 4.3.3 (Constant Expressions) of the GLSL 1.20.8 spec says:
441 * "A constant expression is one of
445 * - a built-in function call whose arguments are all constant
446 * expressions, with the exception of the texture lookup
447 * functions, the noise functions, and ftransform. The built-in
448 * functions dFdx, dFdy, and fwidth must return 0 when evaluated
449 * inside an initializer with an argument that is a constant
452 * Section 5.10 (Constant Expressions) of the GLSL ES 1.00.17 spec says:
454 * "A constant expression is one of
458 * - a built-in function call whose arguments are all constant
459 * expressions, with the exception of the texture lookup
462 * Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec says:
464 * "A constant expression is one of
468 * - a built-in function call whose arguments are all constant
469 * expressions, with the exception of the texture lookup
470 * functions. The built-in functions dFdx, dFdy, and fwidth must
471 * return 0 when evaluated inside an initializer with an argument
472 * that is a constant expression."
474 * If the function call is a constant expression, don't generate any
475 * instructions; just generate an ir_constant.
477 if (state
->is_version(120, 100)) {
478 ir_constant
*value
= sig
->constant_expression_value(actual_parameters
, NULL
);
484 ir_dereference_variable
*deref
= NULL
;
485 if (!sig
->return_type
->is_void()) {
486 /* Create a new temporary to hold the return value. */
487 char *const name
= ir_variable::temporaries_allocate_names
488 ? ralloc_asprintf(ctx
, "%s_retval", sig
->function_name())
493 var
= new(ctx
) ir_variable(sig
->return_type
, name
, ir_var_temporary
);
494 instructions
->push_tail(var
);
498 deref
= new(ctx
) ir_dereference_variable(var
);
501 ir_call
*call
= new(ctx
) ir_call(sig
, deref
, actual_parameters
, sub_var
, array_idx
);
502 instructions
->push_tail(call
);
504 /* Also emit any necessary out-parameter conversions. */
505 instructions
->append_list(&post_call_conversions
);
507 return deref
? deref
->clone(ctx
, NULL
) : NULL
;
511 * Given a function name and parameter list, find the matching signature.
513 static ir_function_signature
*
514 match_function_by_name(const char *name
,
515 exec_list
*actual_parameters
,
516 struct _mesa_glsl_parse_state
*state
)
519 ir_function
*f
= state
->symbols
->get_function(name
);
520 ir_function_signature
*local_sig
= NULL
;
521 ir_function_signature
*sig
= NULL
;
523 /* Is the function hidden by a record type constructor? */
524 if (state
->symbols
->get_type(name
))
525 goto done
; /* no match */
527 /* Is the function hidden by a variable (impossible in 1.10)? */
528 if (!state
->symbols
->separate_function_namespace
529 && state
->symbols
->get_variable(name
))
530 goto done
; /* no match */
533 /* In desktop GL, the presence of a user-defined signature hides any
534 * built-in signatures, so we must ignore them. In contrast, in ES2
535 * user-defined signatures add new overloads, so we must consider them.
537 bool allow_builtins
= state
->es_shader
|| !f
->has_user_signature();
539 /* Look for a match in the local shader. If exact, we're done. */
540 bool is_exact
= false;
541 sig
= local_sig
= f
->matching_signature(state
, actual_parameters
,
542 allow_builtins
, &is_exact
);
550 /* Local shader has no exact candidates; check the built-ins. */
551 _mesa_glsl_initialize_builtin_functions();
552 sig
= _mesa_glsl_find_builtin_function(state
, name
, actual_parameters
);
556 /* If the match is from a linked built-in shader, import the prototype. */
557 if (sig
!= local_sig
) {
559 f
= new(ctx
) ir_function(name
);
560 state
->symbols
->add_global_function(f
);
561 emit_function(state
, f
);
563 f
->add_signature(sig
->clone_prototype(f
, NULL
));
569 static ir_function_signature
*
570 match_subroutine_by_name(const char *name
,
571 exec_list
*actual_parameters
,
572 struct _mesa_glsl_parse_state
*state
,
576 ir_function_signature
*sig
= NULL
;
577 ir_function
*f
, *found
= NULL
;
578 const char *new_name
;
580 bool is_exact
= false;
582 new_name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), name
);
583 var
= state
->symbols
->get_variable(new_name
);
587 for (int i
= 0; i
< state
->num_subroutine_types
; i
++) {
588 f
= state
->subroutine_types
[i
];
589 if (strcmp(f
->name
, var
->type
->without_array()->name
))
598 sig
= found
->matching_signature(state
, actual_parameters
,
604 generate_array_index(void *mem_ctx
, exec_list
*instructions
,
605 struct _mesa_glsl_parse_state
*state
, YYLTYPE loc
,
606 const ast_expression
*array
, ast_expression
*idx
,
607 const char **function_name
, exec_list
*actual_parameters
)
609 if (array
->oper
== ast_array_index
) {
610 /* This handles arrays of arrays */
611 ir_rvalue
*outer_array
= generate_array_index(mem_ctx
, instructions
,
613 array
->subexpressions
[0],
614 array
->subexpressions
[1],
615 function_name
, actual_parameters
);
616 ir_rvalue
*outer_array_idx
= idx
->hir(instructions
, state
);
618 YYLTYPE index_loc
= idx
->get_location();
619 return _mesa_ast_array_index_to_hir(mem_ctx
, state
, outer_array
,
620 outer_array_idx
, loc
,
623 ir_variable
*sub_var
= NULL
;
624 *function_name
= array
->primary_expression
.identifier
;
626 match_subroutine_by_name(*function_name
, actual_parameters
,
629 ir_rvalue
*outer_array_idx
= idx
->hir(instructions
, state
);
630 return new(mem_ctx
) ir_dereference_array(sub_var
, outer_array_idx
);
635 print_function_prototypes(_mesa_glsl_parse_state
*state
, YYLTYPE
*loc
,
641 foreach_in_list(ir_function_signature
, sig
, &f
->signatures
) {
642 if (sig
->is_builtin() && !sig
->is_builtin_available(state
))
645 char *str
= prototype_string(sig
->return_type
, f
->name
, &sig
->parameters
);
646 _mesa_glsl_error(loc
, state
, " %s", str
);
652 * Raise a "no matching function" error, listing all possible overloads the
653 * compiler considered so developers can figure out what went wrong.
656 no_matching_function_error(const char *name
,
658 exec_list
*actual_parameters
,
659 _mesa_glsl_parse_state
*state
)
661 gl_shader
*sh
= _mesa_glsl_get_builtin_function_shader();
663 if (state
->symbols
->get_function(name
) == NULL
664 && (!state
->uses_builtin_functions
665 || sh
->symbols
->get_function(name
) == NULL
)) {
666 _mesa_glsl_error(loc
, state
, "no function with name '%s'", name
);
668 char *str
= prototype_string(NULL
, name
, actual_parameters
);
669 _mesa_glsl_error(loc
, state
,
670 "no matching function for call to `%s'; candidates are:",
674 print_function_prototypes(state
, loc
, state
->symbols
->get_function(name
));
676 if (state
->uses_builtin_functions
) {
677 print_function_prototypes(state
, loc
, sh
->symbols
->get_function(name
));
683 * Perform automatic type conversion of constructor parameters
685 * This implements the rules in the "Conversion and Scalar Constructors"
686 * section (GLSL 1.10 section 5.4.1), not the "Implicit Conversions" rules.
689 convert_component(ir_rvalue
*src
, const glsl_type
*desired_type
)
691 void *ctx
= ralloc_parent(src
);
692 const unsigned a
= desired_type
->base_type
;
693 const unsigned b
= src
->type
->base_type
;
694 ir_expression
*result
= NULL
;
696 if (src
->type
->is_error())
699 assert(a
<= GLSL_TYPE_BOOL
);
700 assert(b
<= GLSL_TYPE_BOOL
);
709 result
= new(ctx
) ir_expression(ir_unop_i2u
, src
);
711 case GLSL_TYPE_FLOAT
:
712 result
= new(ctx
) ir_expression(ir_unop_f2u
, src
);
715 result
= new(ctx
) ir_expression(ir_unop_i2u
,
716 new(ctx
) ir_expression(ir_unop_b2i
, src
));
718 case GLSL_TYPE_DOUBLE
:
719 result
= new(ctx
) ir_expression(ir_unop_d2u
, src
);
726 result
= new(ctx
) ir_expression(ir_unop_u2i
, src
);
728 case GLSL_TYPE_FLOAT
:
729 result
= new(ctx
) ir_expression(ir_unop_f2i
, src
);
732 result
= new(ctx
) ir_expression(ir_unop_b2i
, src
);
734 case GLSL_TYPE_DOUBLE
:
735 result
= new(ctx
) ir_expression(ir_unop_d2i
, src
);
739 case GLSL_TYPE_FLOAT
:
742 result
= new(ctx
) ir_expression(ir_unop_u2f
, desired_type
, src
, NULL
);
745 result
= new(ctx
) ir_expression(ir_unop_i2f
, desired_type
, src
, NULL
);
748 result
= new(ctx
) ir_expression(ir_unop_b2f
, desired_type
, src
, NULL
);
750 case GLSL_TYPE_DOUBLE
:
751 result
= new(ctx
) ir_expression(ir_unop_d2f
, desired_type
, src
, NULL
);
758 result
= new(ctx
) ir_expression(ir_unop_i2b
,
759 new(ctx
) ir_expression(ir_unop_u2i
, src
));
762 result
= new(ctx
) ir_expression(ir_unop_i2b
, desired_type
, src
, NULL
);
764 case GLSL_TYPE_FLOAT
:
765 result
= new(ctx
) ir_expression(ir_unop_f2b
, desired_type
, src
, NULL
);
767 case GLSL_TYPE_DOUBLE
:
768 result
= new(ctx
) ir_expression(ir_unop_d2b
, desired_type
, src
, NULL
);
772 case GLSL_TYPE_DOUBLE
:
775 result
= new(ctx
) ir_expression(ir_unop_i2d
, src
);
778 result
= new(ctx
) ir_expression(ir_unop_u2d
, src
);
781 result
= new(ctx
) ir_expression(ir_unop_f2d
,
782 new(ctx
) ir_expression(ir_unop_b2f
, src
));
784 case GLSL_TYPE_FLOAT
:
785 result
= new(ctx
) ir_expression(ir_unop_f2d
, desired_type
, src
, NULL
);
790 assert(result
!= NULL
);
791 assert(result
->type
== desired_type
);
793 /* Try constant folding; it may fold in the conversion we just added. */
794 ir_constant
*const constant
= result
->constant_expression_value();
795 return (constant
!= NULL
) ? (ir_rvalue
*) constant
: (ir_rvalue
*) result
;
799 * Dereference a specific component from a scalar, vector, or matrix
802 dereference_component(ir_rvalue
*src
, unsigned component
)
804 void *ctx
= ralloc_parent(src
);
805 assert(component
< src
->type
->components());
807 /* If the source is a constant, just create a new constant instead of a
808 * dereference of the existing constant.
810 ir_constant
*constant
= src
->as_constant();
812 return new(ctx
) ir_constant(constant
, component
);
814 if (src
->type
->is_scalar()) {
816 } else if (src
->type
->is_vector()) {
817 return new(ctx
) ir_swizzle(src
, component
, 0, 0, 0, 1);
819 assert(src
->type
->is_matrix());
821 /* Dereference a row of the matrix, then call this function again to get
822 * a specific element from that row.
824 const int c
= component
/ src
->type
->column_type()->vector_elements
;
825 const int r
= component
% src
->type
->column_type()->vector_elements
;
826 ir_constant
*const col_index
= new(ctx
) ir_constant(c
);
827 ir_dereference
*const col
= new(ctx
) ir_dereference_array(src
, col_index
);
829 col
->type
= src
->type
->column_type();
831 return dereference_component(col
, r
);
834 assert(!"Should not get here.");
840 process_vec_mat_constructor(exec_list
*instructions
,
841 const glsl_type
*constructor_type
,
842 YYLTYPE
*loc
, exec_list
*parameters
,
843 struct _mesa_glsl_parse_state
*state
)
847 /* The ARB_shading_language_420pack spec says:
849 * "If an initializer is a list of initializers enclosed in curly braces,
850 * the variable being declared must be a vector, a matrix, an array, or a
853 * int i = { 1 }; // illegal, i is not an aggregate"
855 if (constructor_type
->vector_elements
<= 1) {
856 _mesa_glsl_error(loc
, state
, "aggregates can only initialize vectors, "
857 "matrices, arrays, and structs");
858 return ir_rvalue::error_value(ctx
);
861 exec_list actual_parameters
;
862 const unsigned parameter_count
=
863 process_parameters(instructions
, &actual_parameters
, parameters
, state
);
865 if (parameter_count
== 0
866 || (constructor_type
->is_vector() &&
867 constructor_type
->vector_elements
!= parameter_count
)
868 || (constructor_type
->is_matrix() &&
869 constructor_type
->matrix_columns
!= parameter_count
)) {
870 _mesa_glsl_error(loc
, state
, "%s constructor must have %u parameters",
871 constructor_type
->is_vector() ? "vector" : "matrix",
872 constructor_type
->vector_elements
);
873 return ir_rvalue::error_value(ctx
);
876 bool all_parameters_are_constant
= true;
878 /* Type cast each parameter and, if possible, fold constants. */
879 foreach_in_list_safe(ir_rvalue
, ir
, &actual_parameters
) {
880 ir_rvalue
*result
= ir
;
882 /* Apply implicit conversions (not the scalar constructor rules!). See
883 * the spec quote above. */
884 if (constructor_type
->base_type
!= result
->type
->base_type
) {
885 const glsl_type
*desired_type
=
886 glsl_type::get_instance(constructor_type
->base_type
,
887 ir
->type
->vector_elements
,
888 ir
->type
->matrix_columns
);
889 if (result
->type
->can_implicitly_convert_to(desired_type
, state
)) {
890 /* Even though convert_component() implements the constructor
891 * conversion rules (not the implicit conversion rules), its safe
892 * to use it here because we already checked that the implicit
893 * conversion is legal.
895 result
= convert_component(ir
, desired_type
);
899 if (constructor_type
->is_matrix()) {
900 if (result
->type
!= constructor_type
->column_type()) {
901 _mesa_glsl_error(loc
, state
, "type error in matrix constructor: "
902 "expected: %s, found %s",
903 constructor_type
->column_type()->name
,
905 return ir_rvalue::error_value(ctx
);
907 } else if (result
->type
!= constructor_type
->get_scalar_type()) {
908 _mesa_glsl_error(loc
, state
, "type error in vector constructor: "
909 "expected: %s, found %s",
910 constructor_type
->get_scalar_type()->name
,
912 return ir_rvalue::error_value(ctx
);
915 /* Attempt to convert the parameter to a constant valued expression.
916 * After doing so, track whether or not all the parameters to the
917 * constructor are trivially constant valued expressions.
919 ir_rvalue
*const constant
= result
->constant_expression_value();
921 if (constant
!= NULL
)
924 all_parameters_are_constant
= false;
926 ir
->replace_with(result
);
929 if (all_parameters_are_constant
)
930 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
932 ir_variable
*var
= new(ctx
) ir_variable(constructor_type
, "vec_mat_ctor",
934 instructions
->push_tail(var
);
938 foreach_in_list(ir_rvalue
, rhs
, &actual_parameters
) {
939 ir_instruction
*assignment
= NULL
;
941 if (var
->type
->is_matrix()) {
942 ir_rvalue
*lhs
= new(ctx
) ir_dereference_array(var
,
943 new(ctx
) ir_constant(i
));
944 assignment
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
946 /* use writemask rather than index for vector */
947 assert(var
->type
->is_vector());
949 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
950 assignment
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
, (unsigned)(1 << i
));
953 instructions
->push_tail(assignment
);
958 return new(ctx
) ir_dereference_variable(var
);
963 process_array_constructor(exec_list
*instructions
,
964 const glsl_type
*constructor_type
,
965 YYLTYPE
*loc
, exec_list
*parameters
,
966 struct _mesa_glsl_parse_state
*state
)
969 /* Array constructors come in two forms: sized and unsized. Sized array
970 * constructors look like 'vec4[2](a, b)', where 'a' and 'b' are vec4
971 * variables. In this case the number of parameters must exactly match the
972 * specified size of the array.
974 * Unsized array constructors look like 'vec4[](a, b)', where 'a' and 'b'
975 * are vec4 variables. In this case the size of the array being constructed
976 * is determined by the number of parameters.
978 * From page 52 (page 58 of the PDF) of the GLSL 1.50 spec:
980 * "There must be exactly the same number of arguments as the size of
981 * the array being constructed. If no size is present in the
982 * constructor, then the array is explicitly sized to the number of
983 * arguments provided. The arguments are assigned in order, starting at
984 * element 0, to the elements of the constructed array. Each argument
985 * must be the same type as the element type of the array, or be a type
986 * that can be converted to the element type of the array according to
987 * Section 4.1.10 "Implicit Conversions.""
989 exec_list actual_parameters
;
990 const unsigned parameter_count
=
991 process_parameters(instructions
, &actual_parameters
, parameters
, state
);
992 bool is_unsized_array
= constructor_type
->is_unsized_array();
994 if ((parameter_count
== 0) ||
995 (!is_unsized_array
&& (constructor_type
->length
!= parameter_count
))) {
996 const unsigned min_param
= is_unsized_array
997 ? 1 : constructor_type
->length
;
999 _mesa_glsl_error(loc
, state
, "array constructor must have %s %u "
1001 is_unsized_array
? "at least" : "exactly",
1002 min_param
, (min_param
<= 1) ? "" : "s");
1003 return ir_rvalue::error_value(ctx
);
1006 if (is_unsized_array
) {
1008 glsl_type::get_array_instance(constructor_type
->fields
.array
,
1010 assert(constructor_type
!= NULL
);
1011 assert(constructor_type
->length
== parameter_count
);
1014 bool all_parameters_are_constant
= true;
1015 const glsl_type
*element_type
= constructor_type
->fields
.array
;
1017 /* Type cast each parameter and, if possible, fold constants. */
1018 foreach_in_list_safe(ir_rvalue
, ir
, &actual_parameters
) {
1019 ir_rvalue
*result
= ir
;
1021 const glsl_base_type element_base_type
=
1022 constructor_type
->fields
.array
->base_type
;
1024 /* Apply implicit conversions (not the scalar constructor rules!). See
1025 * the spec quote above. */
1026 if (element_base_type
!= result
->type
->base_type
) {
1027 const glsl_type
*desired_type
=
1028 glsl_type::get_instance(element_base_type
,
1029 ir
->type
->vector_elements
,
1030 ir
->type
->matrix_columns
);
1032 if (result
->type
->can_implicitly_convert_to(desired_type
, state
)) {
1033 /* Even though convert_component() implements the constructor
1034 * conversion rules (not the implicit conversion rules), its safe
1035 * to use it here because we already checked that the implicit
1036 * conversion is legal.
1038 result
= convert_component(ir
, desired_type
);
1042 if (constructor_type
->fields
.array
->is_unsized_array()) {
1043 /* As the inner parameters of the constructor are created without
1044 * knowledge of each other we need to check to make sure unsized
1045 * parameters of unsized constructors all end up with the same size.
1047 * e.g we make sure to fail for a constructor like this:
1048 * vec4[][] a = vec4[][](vec4[](vec4(0.0), vec4(1.0)),
1049 * vec4[](vec4(0.0), vec4(1.0), vec4(1.0)),
1050 * vec4[](vec4(0.0), vec4(1.0)));
1052 if (element_type
->is_unsized_array()) {
1053 /* This is the first parameter so just get the type */
1054 element_type
= result
->type
;
1055 } else if (element_type
!= result
->type
) {
1056 _mesa_glsl_error(loc
, state
, "type error in array constructor: "
1057 "expected: %s, found %s",
1059 result
->type
->name
);
1060 return ir_rvalue::error_value(ctx
);
1062 } else if (result
->type
!= constructor_type
->fields
.array
) {
1063 _mesa_glsl_error(loc
, state
, "type error in array constructor: "
1064 "expected: %s, found %s",
1065 constructor_type
->fields
.array
->name
,
1066 result
->type
->name
);
1067 return ir_rvalue::error_value(ctx
);
1069 element_type
= result
->type
;
1072 /* Attempt to convert the parameter to a constant valued expression.
1073 * After doing so, track whether or not all the parameters to the
1074 * constructor are trivially constant valued expressions.
1076 ir_rvalue
*const constant
= result
->constant_expression_value();
1078 if (constant
!= NULL
)
1081 all_parameters_are_constant
= false;
1083 ir
->replace_with(result
);
1086 if (constructor_type
->fields
.array
->is_unsized_array()) {
1088 glsl_type::get_array_instance(element_type
,
1090 assert(constructor_type
!= NULL
);
1091 assert(constructor_type
->length
== parameter_count
);
1094 if (all_parameters_are_constant
)
1095 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
1097 ir_variable
*var
= new(ctx
) ir_variable(constructor_type
, "array_ctor",
1099 instructions
->push_tail(var
);
1102 foreach_in_list(ir_rvalue
, rhs
, &actual_parameters
) {
1103 ir_rvalue
*lhs
= new(ctx
) ir_dereference_array(var
,
1104 new(ctx
) ir_constant(i
));
1106 ir_instruction
*assignment
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
1107 instructions
->push_tail(assignment
);
1112 return new(ctx
) ir_dereference_variable(var
);
1117 * Try to convert a record constructor to a constant expression
1119 static ir_constant
*
1120 constant_record_constructor(const glsl_type
*constructor_type
,
1121 exec_list
*parameters
, void *mem_ctx
)
1123 foreach_in_list(ir_instruction
, node
, parameters
) {
1124 ir_constant
*constant
= node
->as_constant();
1125 if (constant
== NULL
)
1127 node
->replace_with(constant
);
1130 return new(mem_ctx
) ir_constant(constructor_type
, parameters
);
1135 * Determine if a list consists of a single scalar r-value
1138 single_scalar_parameter(exec_list
*parameters
)
1140 const ir_rvalue
*const p
= (ir_rvalue
*) parameters
->head
;
1141 assert(((ir_rvalue
*)p
)->as_rvalue() != NULL
);
1143 return (p
->type
->is_scalar() && p
->next
->is_tail_sentinel());
1148 * Generate inline code for a vector constructor
1150 * The generated constructor code will consist of a temporary variable
1151 * declaration of the same type as the constructor. A sequence of assignments
1152 * from constructor parameters to the temporary will follow.
1155 * An \c ir_dereference_variable of the temprorary generated in the constructor
1159 emit_inline_vector_constructor(const glsl_type
*type
,
1160 exec_list
*instructions
,
1161 exec_list
*parameters
,
1164 assert(!parameters
->is_empty());
1166 ir_variable
*var
= new(ctx
) ir_variable(type
, "vec_ctor", ir_var_temporary
);
1167 instructions
->push_tail(var
);
1169 /* There are three kinds of vector constructors.
1171 * - Construct a vector from a single scalar by replicating that scalar to
1172 * all components of the vector.
1174 * - Construct a vector from at least a matrix. This case should already
1175 * have been taken care of in ast_function_expression::hir by breaking
1176 * down the matrix into a series of column vectors.
1178 * - Construct a vector from an arbirary combination of vectors and
1179 * scalars. The components of the constructor parameters are assigned
1180 * to the vector in order until the vector is full.
1182 const unsigned lhs_components
= type
->components();
1183 if (single_scalar_parameter(parameters
)) {
1184 ir_rvalue
*first_param
= (ir_rvalue
*)parameters
->head
;
1185 ir_rvalue
*rhs
= new(ctx
) ir_swizzle(first_param
, 0, 0, 0, 0,
1187 ir_dereference_variable
*lhs
= new(ctx
) ir_dereference_variable(var
);
1188 const unsigned mask
= (1U << lhs_components
) - 1;
1190 assert(rhs
->type
== lhs
->type
);
1192 ir_instruction
*inst
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
, mask
);
1193 instructions
->push_tail(inst
);
1195 unsigned base_component
= 0;
1196 unsigned base_lhs_component
= 0;
1197 ir_constant_data data
;
1198 unsigned constant_mask
= 0, constant_components
= 0;
1200 memset(&data
, 0, sizeof(data
));
1202 foreach_in_list(ir_rvalue
, param
, parameters
) {
1203 unsigned rhs_components
= param
->type
->components();
1205 /* Do not try to assign more components to the vector than it has!
1207 if ((rhs_components
+ base_lhs_component
) > lhs_components
) {
1208 rhs_components
= lhs_components
- base_lhs_component
;
1211 const ir_constant
*const c
= param
->as_constant();
1213 for (unsigned i
= 0; i
< rhs_components
; i
++) {
1214 switch (c
->type
->base_type
) {
1215 case GLSL_TYPE_UINT
:
1216 data
.u
[i
+ base_component
] = c
->get_uint_component(i
);
1219 data
.i
[i
+ base_component
] = c
->get_int_component(i
);
1221 case GLSL_TYPE_FLOAT
:
1222 data
.f
[i
+ base_component
] = c
->get_float_component(i
);
1224 case GLSL_TYPE_DOUBLE
:
1225 data
.d
[i
+ base_component
] = c
->get_double_component(i
);
1227 case GLSL_TYPE_BOOL
:
1228 data
.b
[i
+ base_component
] = c
->get_bool_component(i
);
1231 assert(!"Should not get here.");
1236 /* Mask of fields to be written in the assignment.
1238 constant_mask
|= ((1U << rhs_components
) - 1) << base_lhs_component
;
1239 constant_components
+= rhs_components
;
1241 base_component
+= rhs_components
;
1243 /* Advance the component index by the number of components
1244 * that were just assigned.
1246 base_lhs_component
+= rhs_components
;
1249 if (constant_mask
!= 0) {
1250 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
1251 const glsl_type
*rhs_type
= glsl_type::get_instance(var
->type
->base_type
,
1252 constant_components
,
1254 ir_rvalue
*rhs
= new(ctx
) ir_constant(rhs_type
, &data
);
1256 ir_instruction
*inst
=
1257 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, constant_mask
);
1258 instructions
->push_tail(inst
);
1262 foreach_in_list(ir_rvalue
, param
, parameters
) {
1263 unsigned rhs_components
= param
->type
->components();
1265 /* Do not try to assign more components to the vector than it has!
1267 if ((rhs_components
+ base_component
) > lhs_components
) {
1268 rhs_components
= lhs_components
- base_component
;
1271 /* If we do not have any components left to copy, break out of the
1272 * loop. This can happen when initializing a vec4 with a mat3 as the
1273 * mat3 would have been broken into a series of column vectors.
1275 if (rhs_components
== 0) {
1279 const ir_constant
*const c
= param
->as_constant();
1281 /* Mask of fields to be written in the assignment.
1283 const unsigned write_mask
= ((1U << rhs_components
) - 1)
1286 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
1288 /* Generate a swizzle so that LHS and RHS sizes match.
1291 new(ctx
) ir_swizzle(param
, 0, 1, 2, 3, rhs_components
);
1293 ir_instruction
*inst
=
1294 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, write_mask
);
1295 instructions
->push_tail(inst
);
1298 /* Advance the component index by the number of components that were
1301 base_component
+= rhs_components
;
1304 return new(ctx
) ir_dereference_variable(var
);
1309 * Generate assignment of a portion of a vector to a portion of a matrix column
1311 * \param src_base First component of the source to be used in assignment
1312 * \param column Column of destination to be assiged
1313 * \param row_base First component of the destination column to be assigned
1314 * \param count Number of components to be assigned
1317 * \c src_base + \c count must be less than or equal to the number of components
1318 * in the source vector.
1321 assign_to_matrix_column(ir_variable
*var
, unsigned column
, unsigned row_base
,
1322 ir_rvalue
*src
, unsigned src_base
, unsigned count
,
1325 ir_constant
*col_idx
= new(mem_ctx
) ir_constant(column
);
1326 ir_dereference
*column_ref
= new(mem_ctx
) ir_dereference_array(var
, col_idx
);
1328 assert(column_ref
->type
->components() >= (row_base
+ count
));
1329 assert(src
->type
->components() >= (src_base
+ count
));
1331 /* Generate a swizzle that extracts the number of components from the source
1332 * that are to be assigned to the column of the matrix.
1334 if (count
< src
->type
->vector_elements
) {
1335 src
= new(mem_ctx
) ir_swizzle(src
,
1336 src_base
+ 0, src_base
+ 1,
1337 src_base
+ 2, src_base
+ 3,
1341 /* Mask of fields to be written in the assignment.
1343 const unsigned write_mask
= ((1U << count
) - 1) << row_base
;
1345 return new(mem_ctx
) ir_assignment(column_ref
, src
, NULL
, write_mask
);
1350 * Generate inline code for a matrix constructor
1352 * The generated constructor code will consist of a temporary variable
1353 * declaration of the same type as the constructor. A sequence of assignments
1354 * from constructor parameters to the temporary will follow.
1357 * An \c ir_dereference_variable of the temprorary generated in the constructor
1361 emit_inline_matrix_constructor(const glsl_type
*type
,
1362 exec_list
*instructions
,
1363 exec_list
*parameters
,
1366 assert(!parameters
->is_empty());
1368 ir_variable
*var
= new(ctx
) ir_variable(type
, "mat_ctor", ir_var_temporary
);
1369 instructions
->push_tail(var
);
1371 /* There are three kinds of matrix constructors.
1373 * - Construct a matrix from a single scalar by replicating that scalar to
1374 * along the diagonal of the matrix and setting all other components to
1377 * - Construct a matrix from an arbirary combination of vectors and
1378 * scalars. The components of the constructor parameters are assigned
1379 * to the matrix in column-major order until the matrix is full.
1381 * - Construct a matrix from a single matrix. The source matrix is copied
1382 * to the upper left portion of the constructed matrix, and the remaining
1383 * elements take values from the identity matrix.
1385 ir_rvalue
*const first_param
= (ir_rvalue
*) parameters
->head
;
1386 if (single_scalar_parameter(parameters
)) {
1387 /* Assign the scalar to the X component of a vec4, and fill the remaining
1388 * components with zero.
1390 glsl_base_type param_base_type
= first_param
->type
->base_type
;
1391 assert(param_base_type
== GLSL_TYPE_FLOAT
||
1392 param_base_type
== GLSL_TYPE_DOUBLE
);
1393 ir_variable
*rhs_var
=
1394 new(ctx
) ir_variable(glsl_type::get_instance(param_base_type
, 4, 1),
1397 instructions
->push_tail(rhs_var
);
1399 ir_constant_data zero
;
1400 for (unsigned i
= 0; i
< 4; i
++)
1401 if (param_base_type
== GLSL_TYPE_FLOAT
)
1406 ir_instruction
*inst
=
1407 new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(rhs_var
),
1408 new(ctx
) ir_constant(rhs_var
->type
, &zero
),
1410 instructions
->push_tail(inst
);
1412 ir_dereference
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1414 inst
= new(ctx
) ir_assignment(rhs_ref
, first_param
, NULL
, 0x01);
1415 instructions
->push_tail(inst
);
1417 /* Assign the temporary vector to each column of the destination matrix
1418 * with a swizzle that puts the X component on the diagonal of the
1419 * matrix. In some cases this may mean that the X component does not
1420 * get assigned into the column at all (i.e., when the matrix has more
1421 * columns than rows).
1423 static const unsigned rhs_swiz
[4][4] = {
1430 const unsigned cols_to_init
= MIN2(type
->matrix_columns
,
1431 type
->vector_elements
);
1432 for (unsigned i
= 0; i
< cols_to_init
; i
++) {
1433 ir_constant
*const col_idx
= new(ctx
) ir_constant(i
);
1434 ir_rvalue
*const col_ref
= new(ctx
) ir_dereference_array(var
, col_idx
);
1436 ir_rvalue
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1437 ir_rvalue
*const rhs
= new(ctx
) ir_swizzle(rhs_ref
, rhs_swiz
[i
],
1438 type
->vector_elements
);
1440 inst
= new(ctx
) ir_assignment(col_ref
, rhs
, NULL
);
1441 instructions
->push_tail(inst
);
1444 for (unsigned i
= cols_to_init
; i
< type
->matrix_columns
; i
++) {
1445 ir_constant
*const col_idx
= new(ctx
) ir_constant(i
);
1446 ir_rvalue
*const col_ref
= new(ctx
) ir_dereference_array(var
, col_idx
);
1448 ir_rvalue
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1449 ir_rvalue
*const rhs
= new(ctx
) ir_swizzle(rhs_ref
, 1, 1, 1, 1,
1450 type
->vector_elements
);
1452 inst
= new(ctx
) ir_assignment(col_ref
, rhs
, NULL
);
1453 instructions
->push_tail(inst
);
1455 } else if (first_param
->type
->is_matrix()) {
1456 /* From page 50 (56 of the PDF) of the GLSL 1.50 spec:
1458 * "If a matrix is constructed from a matrix, then each component
1459 * (column i, row j) in the result that has a corresponding
1460 * component (column i, row j) in the argument will be initialized
1461 * from there. All other components will be initialized to the
1462 * identity matrix. If a matrix argument is given to a matrix
1463 * constructor, it is an error to have any other arguments."
1465 assert(first_param
->next
->is_tail_sentinel());
1466 ir_rvalue
*const src_matrix
= first_param
;
1468 /* If the source matrix is smaller, pre-initialize the relavent parts of
1469 * the destination matrix to the identity matrix.
1471 if ((src_matrix
->type
->matrix_columns
< var
->type
->matrix_columns
)
1472 || (src_matrix
->type
->vector_elements
< var
->type
->vector_elements
)) {
1474 /* If the source matrix has fewer rows, every column of the destination
1475 * must be initialized. Otherwise only the columns in the destination
1476 * that do not exist in the source must be initialized.
1479 (src_matrix
->type
->vector_elements
< var
->type
->vector_elements
)
1480 ? 0 : src_matrix
->type
->matrix_columns
;
1482 const glsl_type
*const col_type
= var
->type
->column_type();
1483 for (/* empty */; col
< var
->type
->matrix_columns
; col
++) {
1484 ir_constant_data ident
;
1493 ir_rvalue
*const rhs
= new(ctx
) ir_constant(col_type
, &ident
);
1495 ir_rvalue
*const lhs
=
1496 new(ctx
) ir_dereference_array(var
, new(ctx
) ir_constant(col
));
1498 ir_instruction
*inst
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
1499 instructions
->push_tail(inst
);
1503 /* Assign columns from the source matrix to the destination matrix.
1505 * Since the parameter will be used in the RHS of multiple assignments,
1506 * generate a temporary and copy the paramter there.
1508 ir_variable
*const rhs_var
=
1509 new(ctx
) ir_variable(first_param
->type
, "mat_ctor_mat",
1511 instructions
->push_tail(rhs_var
);
1513 ir_dereference
*const rhs_var_ref
=
1514 new(ctx
) ir_dereference_variable(rhs_var
);
1515 ir_instruction
*const inst
=
1516 new(ctx
) ir_assignment(rhs_var_ref
, first_param
, NULL
);
1517 instructions
->push_tail(inst
);
1519 const unsigned last_row
= MIN2(src_matrix
->type
->vector_elements
,
1520 var
->type
->vector_elements
);
1521 const unsigned last_col
= MIN2(src_matrix
->type
->matrix_columns
,
1522 var
->type
->matrix_columns
);
1524 unsigned swiz
[4] = { 0, 0, 0, 0 };
1525 for (unsigned i
= 1; i
< last_row
; i
++)
1528 const unsigned write_mask
= (1U << last_row
) - 1;
1530 for (unsigned i
= 0; i
< last_col
; i
++) {
1531 ir_dereference
*const lhs
=
1532 new(ctx
) ir_dereference_array(var
, new(ctx
) ir_constant(i
));
1533 ir_rvalue
*const rhs_col
=
1534 new(ctx
) ir_dereference_array(rhs_var
, new(ctx
) ir_constant(i
));
1536 /* If one matrix has columns that are smaller than the columns of the
1537 * other matrix, wrap the column access of the larger with a swizzle
1538 * so that the LHS and RHS of the assignment have the same size (and
1539 * therefore have the same type).
1541 * It would be perfectly valid to unconditionally generate the
1542 * swizzles, this this will typically result in a more compact IR tree.
1545 if (lhs
->type
->vector_elements
!= rhs_col
->type
->vector_elements
) {
1546 rhs
= new(ctx
) ir_swizzle(rhs_col
, swiz
, last_row
);
1551 ir_instruction
*inst
=
1552 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, write_mask
);
1553 instructions
->push_tail(inst
);
1556 const unsigned cols
= type
->matrix_columns
;
1557 const unsigned rows
= type
->vector_elements
;
1558 unsigned remaining_slots
= rows
* cols
;
1559 unsigned col_idx
= 0;
1560 unsigned row_idx
= 0;
1562 foreach_in_list(ir_rvalue
, rhs
, parameters
) {
1563 unsigned rhs_components
= rhs
->type
->components();
1564 unsigned rhs_base
= 0;
1566 if (remaining_slots
== 0)
1569 /* Since the parameter might be used in the RHS of two assignments,
1570 * generate a temporary and copy the paramter there.
1572 ir_variable
*rhs_var
=
1573 new(ctx
) ir_variable(rhs
->type
, "mat_ctor_vec", ir_var_temporary
);
1574 instructions
->push_tail(rhs_var
);
1576 ir_dereference
*rhs_var_ref
=
1577 new(ctx
) ir_dereference_variable(rhs_var
);
1578 ir_instruction
*inst
= new(ctx
) ir_assignment(rhs_var_ref
, rhs
, NULL
);
1579 instructions
->push_tail(inst
);
1582 /* Assign the current parameter to as many components of the matrix
1585 * NOTE: A single vector parameter can span two matrix columns. A
1586 * single vec4, for example, can completely fill a mat2.
1588 unsigned count
= MIN2(rows
- row_idx
,
1589 rhs_components
- rhs_base
);
1591 rhs_var_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1592 ir_instruction
*inst
= assign_to_matrix_column(var
, col_idx
,
1597 instructions
->push_tail(inst
);
1600 remaining_slots
-= count
;
1602 /* Sometimes, there is still data left in the parameters and
1603 * components left to be set in the destination but in other
1606 if (row_idx
>= rows
) {
1610 } while(remaining_slots
> 0 && rhs_base
< rhs_components
);
1614 return new(ctx
) ir_dereference_variable(var
);
1619 emit_inline_record_constructor(const glsl_type
*type
,
1620 exec_list
*instructions
,
1621 exec_list
*parameters
,
1624 ir_variable
*const var
=
1625 new(mem_ctx
) ir_variable(type
, "record_ctor", ir_var_temporary
);
1626 ir_dereference_variable
*const d
= new(mem_ctx
) ir_dereference_variable(var
);
1628 instructions
->push_tail(var
);
1630 exec_node
*node
= parameters
->head
;
1631 for (unsigned i
= 0; i
< type
->length
; i
++) {
1632 assert(!node
->is_tail_sentinel());
1634 ir_dereference
*const lhs
=
1635 new(mem_ctx
) ir_dereference_record(d
->clone(mem_ctx
, NULL
),
1636 type
->fields
.structure
[i
].name
);
1638 ir_rvalue
*const rhs
= ((ir_instruction
*) node
)->as_rvalue();
1639 assert(rhs
!= NULL
);
1641 ir_instruction
*const assign
= new(mem_ctx
) ir_assignment(lhs
, rhs
, NULL
);
1643 instructions
->push_tail(assign
);
1652 process_record_constructor(exec_list
*instructions
,
1653 const glsl_type
*constructor_type
,
1654 YYLTYPE
*loc
, exec_list
*parameters
,
1655 struct _mesa_glsl_parse_state
*state
)
1658 exec_list actual_parameters
;
1660 process_parameters(instructions
, &actual_parameters
,
1663 exec_node
*node
= actual_parameters
.head
;
1664 for (unsigned i
= 0; i
< constructor_type
->length
; i
++) {
1665 ir_rvalue
*ir
= (ir_rvalue
*) node
;
1667 if (node
->is_tail_sentinel()) {
1668 _mesa_glsl_error(loc
, state
,
1669 "insufficient parameters to constructor for `%s'",
1670 constructor_type
->name
);
1671 return ir_rvalue::error_value(ctx
);
1674 if (apply_implicit_conversion(constructor_type
->fields
.structure
[i
].type
,
1676 node
->replace_with(ir
);
1678 _mesa_glsl_error(loc
, state
,
1679 "parameter type mismatch in constructor for `%s.%s' "
1681 constructor_type
->name
,
1682 constructor_type
->fields
.structure
[i
].name
,
1684 constructor_type
->fields
.structure
[i
].type
->name
);
1685 return ir_rvalue::error_value(ctx
);;
1691 if (!node
->is_tail_sentinel()) {
1692 _mesa_glsl_error(loc
, state
, "too many parameters in constructor "
1693 "for `%s'", constructor_type
->name
);
1694 return ir_rvalue::error_value(ctx
);
1697 ir_rvalue
*const constant
=
1698 constant_record_constructor(constructor_type
, &actual_parameters
,
1701 return (constant
!= NULL
)
1703 : emit_inline_record_constructor(constructor_type
, instructions
,
1704 &actual_parameters
, state
);
1708 ast_function_expression::handle_method(exec_list
*instructions
,
1709 struct _mesa_glsl_parse_state
*state
)
1711 const ast_expression
*field
= subexpressions
[0];
1715 /* Handle "method calls" in GLSL 1.20 - namely, array.length() */
1716 YYLTYPE loc
= get_location();
1717 state
->check_version(120, 300, &loc
, "methods not supported");
1720 method
= field
->primary_expression
.identifier
;
1722 op
= field
->subexpressions
[0]->hir(instructions
, state
);
1723 if (strcmp(method
, "length") == 0) {
1724 if (!this->expressions
.is_empty()) {
1725 _mesa_glsl_error(&loc
, state
, "length method takes no arguments");
1729 if (op
->type
->is_array()) {
1730 if (op
->type
->is_unsized_array()) {
1731 if (!state
->has_shader_storage_buffer_objects()) {
1732 _mesa_glsl_error(&loc
, state
, "length called on unsized array"
1733 " only available with "
1734 "ARB_shader_storage_buffer_object");
1736 /* Calculate length of an unsized array in run-time */
1737 result
= new(ctx
) ir_expression(ir_unop_ssbo_unsized_array_length
, op
);
1739 result
= new(ctx
) ir_constant(op
->type
->array_size());
1741 } else if (op
->type
->is_vector()) {
1742 if (state
->has_420pack()) {
1743 /* .length() returns int. */
1744 result
= new(ctx
) ir_constant((int) op
->type
->vector_elements
);
1746 _mesa_glsl_error(&loc
, state
, "length method on matrix only available"
1747 "with ARB_shading_language_420pack");
1750 } else if (op
->type
->is_matrix()) {
1751 if (state
->has_420pack()) {
1752 /* .length() returns int. */
1753 result
= new(ctx
) ir_constant((int) op
->type
->matrix_columns
);
1755 _mesa_glsl_error(&loc
, state
, "length method on matrix only available"
1756 "with ARB_shading_language_420pack");
1760 _mesa_glsl_error(&loc
, state
, "length called on scalar.");
1764 _mesa_glsl_error(&loc
, state
, "unknown method: `%s'", method
);
1769 return ir_rvalue::error_value(ctx
);
1773 ast_function_expression::hir(exec_list
*instructions
,
1774 struct _mesa_glsl_parse_state
*state
)
1777 /* There are three sorts of function calls.
1779 * 1. constructors - The first subexpression is an ast_type_specifier.
1780 * 2. methods - Only the .length() method of array types.
1781 * 3. functions - Calls to regular old functions.
1784 if (is_constructor()) {
1785 const ast_type_specifier
*type
= (ast_type_specifier
*) subexpressions
[0];
1786 YYLTYPE loc
= type
->get_location();
1789 const glsl_type
*const constructor_type
= type
->glsl_type(& name
, state
);
1791 /* constructor_type can be NULL if a variable with the same name as the
1792 * structure has come into scope.
1794 if (constructor_type
== NULL
) {
1795 _mesa_glsl_error(& loc
, state
, "unknown type `%s' (structure name "
1796 "may be shadowed by a variable with the same name)",
1798 return ir_rvalue::error_value(ctx
);
1802 /* Constructors for opaque types are illegal.
1804 if (constructor_type
->contains_opaque()) {
1805 _mesa_glsl_error(& loc
, state
, "cannot construct opaque type `%s'",
1806 constructor_type
->name
);
1807 return ir_rvalue::error_value(ctx
);
1810 if (constructor_type
->is_array()) {
1811 if (!state
->check_version(120, 300, &loc
,
1812 "array constructors forbidden")) {
1813 return ir_rvalue::error_value(ctx
);
1816 return process_array_constructor(instructions
, constructor_type
,
1817 & loc
, &this->expressions
, state
);
1821 /* There are two kinds of constructor calls. Constructors for arrays and
1822 * structures must have the exact number of arguments with matching types
1823 * in the correct order. These constructors follow essentially the same
1824 * type matching rules as functions.
1826 * Constructors for built-in language types, such as mat4 and vec2, are
1827 * free form. The only requirements are that the parameters must provide
1828 * enough values of the correct scalar type and that no arguments are
1829 * given past the last used argument.
1831 * When using the C-style initializer syntax from GLSL 4.20, constructors
1832 * must have the exact number of arguments with matching types in the
1835 if (constructor_type
->is_record()) {
1836 return process_record_constructor(instructions
, constructor_type
,
1837 &loc
, &this->expressions
,
1841 if (!constructor_type
->is_numeric() && !constructor_type
->is_boolean())
1842 return ir_rvalue::error_value(ctx
);
1844 /* Total number of components of the type being constructed. */
1845 const unsigned type_components
= constructor_type
->components();
1847 /* Number of components from parameters that have actually been
1848 * consumed. This is used to perform several kinds of error checking.
1850 unsigned components_used
= 0;
1852 unsigned matrix_parameters
= 0;
1853 unsigned nonmatrix_parameters
= 0;
1854 exec_list actual_parameters
;
1856 foreach_list_typed(ast_node
, ast
, link
, &this->expressions
) {
1857 ir_rvalue
*result
= ast
->hir(instructions
, state
);
1859 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
1861 * "It is an error to provide extra arguments beyond this
1862 * last used argument."
1864 if (components_used
>= type_components
) {
1865 _mesa_glsl_error(& loc
, state
, "too many parameters to `%s' "
1867 constructor_type
->name
);
1868 return ir_rvalue::error_value(ctx
);
1871 if (!result
->type
->is_numeric() && !result
->type
->is_boolean()) {
1872 _mesa_glsl_error(& loc
, state
, "cannot construct `%s' from a "
1873 "non-numeric data type",
1874 constructor_type
->name
);
1875 return ir_rvalue::error_value(ctx
);
1878 /* Count the number of matrix and nonmatrix parameters. This
1879 * is used below to enforce some of the constructor rules.
1881 if (result
->type
->is_matrix())
1882 matrix_parameters
++;
1884 nonmatrix_parameters
++;
1886 actual_parameters
.push_tail(result
);
1887 components_used
+= result
->type
->components();
1890 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
1892 * "It is an error to construct matrices from other matrices. This
1893 * is reserved for future use."
1895 if (matrix_parameters
> 0
1896 && constructor_type
->is_matrix()
1897 && !state
->check_version(120, 100, &loc
,
1898 "cannot construct `%s' from a matrix",
1899 constructor_type
->name
)) {
1900 return ir_rvalue::error_value(ctx
);
1903 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
1905 * "If a matrix argument is given to a matrix constructor, it is
1906 * an error to have any other arguments."
1908 if ((matrix_parameters
> 0)
1909 && ((matrix_parameters
+ nonmatrix_parameters
) > 1)
1910 && constructor_type
->is_matrix()) {
1911 _mesa_glsl_error(& loc
, state
, "for matrix `%s' constructor, "
1912 "matrix must be only parameter",
1913 constructor_type
->name
);
1914 return ir_rvalue::error_value(ctx
);
1917 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
1919 * "In these cases, there must be enough components provided in the
1920 * arguments to provide an initializer for every component in the
1921 * constructed value."
1923 if (components_used
< type_components
&& components_used
!= 1
1924 && matrix_parameters
== 0) {
1925 _mesa_glsl_error(& loc
, state
, "too few components to construct "
1927 constructor_type
->name
);
1928 return ir_rvalue::error_value(ctx
);
1931 /* Matrices can never be consumed as is by any constructor but matrix
1932 * constructors. If the constructor type is not matrix, always break the
1933 * matrix up into a series of column vectors.
1935 if (!constructor_type
->is_matrix()) {
1936 foreach_in_list_safe(ir_rvalue
, matrix
, &actual_parameters
) {
1937 if (!matrix
->type
->is_matrix())
1940 /* Create a temporary containing the matrix. */
1941 ir_variable
*var
= new(ctx
) ir_variable(matrix
->type
, "matrix_tmp",
1943 instructions
->push_tail(var
);
1944 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
)
1945 ir_dereference_variable(var
), matrix
, NULL
));
1946 var
->constant_value
= matrix
->constant_expression_value();
1948 /* Replace the matrix with dereferences of its columns. */
1949 for (int i
= 0; i
< matrix
->type
->matrix_columns
; i
++) {
1950 matrix
->insert_before(new (ctx
) ir_dereference_array(var
,
1951 new(ctx
) ir_constant(i
)));
1957 bool all_parameters_are_constant
= true;
1959 /* Type cast each parameter and, if possible, fold constants.*/
1960 foreach_in_list_safe(ir_rvalue
, ir
, &actual_parameters
) {
1961 const glsl_type
*desired_type
=
1962 glsl_type::get_instance(constructor_type
->base_type
,
1963 ir
->type
->vector_elements
,
1964 ir
->type
->matrix_columns
);
1965 ir_rvalue
*result
= convert_component(ir
, desired_type
);
1967 /* Attempt to convert the parameter to a constant valued expression.
1968 * After doing so, track whether or not all the parameters to the
1969 * constructor are trivially constant valued expressions.
1971 ir_rvalue
*const constant
= result
->constant_expression_value();
1973 if (constant
!= NULL
)
1976 all_parameters_are_constant
= false;
1979 ir
->replace_with(result
);
1983 /* If all of the parameters are trivially constant, create a
1984 * constant representing the complete collection of parameters.
1986 if (all_parameters_are_constant
) {
1987 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
1988 } else if (constructor_type
->is_scalar()) {
1989 return dereference_component((ir_rvalue
*) actual_parameters
.head
,
1991 } else if (constructor_type
->is_vector()) {
1992 return emit_inline_vector_constructor(constructor_type
,
1997 assert(constructor_type
->is_matrix());
1998 return emit_inline_matrix_constructor(constructor_type
,
2003 } else if (subexpressions
[0]->oper
== ast_field_selection
) {
2004 return handle_method(instructions
, state
);
2006 const ast_expression
*id
= subexpressions
[0];
2007 const char *func_name
;
2008 YYLTYPE loc
= get_location();
2009 exec_list actual_parameters
;
2010 ir_variable
*sub_var
= NULL
;
2011 ir_rvalue
*array_idx
= NULL
;
2013 process_parameters(instructions
, &actual_parameters
, &this->expressions
,
2016 if (id
->oper
== ast_array_index
) {
2017 array_idx
= generate_array_index(ctx
, instructions
, state
, loc
,
2018 id
->subexpressions
[0],
2019 id
->subexpressions
[1], &func_name
,
2020 &actual_parameters
);
2022 func_name
= id
->primary_expression
.identifier
;
2025 ir_function_signature
*sig
=
2026 match_function_by_name(func_name
, &actual_parameters
, state
);
2028 ir_rvalue
*value
= NULL
;
2030 sig
= match_subroutine_by_name(func_name
, &actual_parameters
, state
, &sub_var
);
2034 no_matching_function_error(func_name
, &loc
, &actual_parameters
, state
);
2035 value
= ir_rvalue::error_value(ctx
);
2036 } else if (!verify_parameter_modes(state
, sig
, actual_parameters
, this->expressions
)) {
2037 /* an error has already been emitted */
2038 value
= ir_rvalue::error_value(ctx
);
2040 value
= generate_call(instructions
, sig
, &actual_parameters
, sub_var
, array_idx
, state
);
2042 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::void_type
,
2045 instructions
->push_tail(tmp
);
2046 value
= new(ctx
) ir_dereference_variable(tmp
);
2053 unreachable("not reached");
2057 ast_function_expression::has_sequence_subexpression() const
2059 foreach_list_typed(const ast_node
, ast
, link
, &this->expressions
) {
2060 if (ast
->has_sequence_subexpression())
2068 ast_aggregate_initializer::hir(exec_list
*instructions
,
2069 struct _mesa_glsl_parse_state
*state
)
2072 YYLTYPE loc
= this->get_location();
2074 if (!this->constructor_type
) {
2075 _mesa_glsl_error(&loc
, state
, "type of C-style initializer unknown");
2076 return ir_rvalue::error_value(ctx
);
2078 const glsl_type
*const constructor_type
= this->constructor_type
;
2080 if (!state
->has_420pack()) {
2081 _mesa_glsl_error(&loc
, state
, "C-style initialization requires the "
2082 "GL_ARB_shading_language_420pack extension");
2083 return ir_rvalue::error_value(ctx
);
2086 if (constructor_type
->is_array()) {
2087 return process_array_constructor(instructions
, constructor_type
, &loc
,
2088 &this->expressions
, state
);
2091 if (constructor_type
->is_record()) {
2092 return process_record_constructor(instructions
, constructor_type
, &loc
,
2093 &this->expressions
, state
);
2096 return process_vec_mat_constructor(instructions
, constructor_type
, &loc
,
2097 &this->expressions
, state
);