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 "compiler/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 /* We need to process the parameters first in order to know if we can
47 * raise or not a unitialized warning. Calling set_is_lhs silence the
48 * warning for now. Raising the warning or not will be checked at
49 * verify_parameter_modes.
51 ast
->set_is_lhs(true);
52 ir_rvalue
*result
= ast
->hir(instructions
, state
);
54 ir_constant
*const constant
= result
->constant_expression_value();
58 actual_parameters
->push_tail(result
);
67 * Generate a source prototype for a function signature
69 * \param return_type Return type of the function. May be \c NULL.
70 * \param name Name of the function.
71 * \param parameters List of \c ir_instruction nodes representing the
72 * parameter list for the function. This may be either a
73 * formal (\c ir_variable) or actual (\c ir_rvalue)
74 * parameter list. Only the type is used.
77 * A ralloced string representing the prototype of the function.
80 prototype_string(const glsl_type
*return_type
, const char *name
,
81 exec_list
*parameters
)
85 if (return_type
!= NULL
)
86 str
= ralloc_asprintf(NULL
, "%s ", return_type
->name
);
88 ralloc_asprintf_append(&str
, "%s(", name
);
90 const char *comma
= "";
91 foreach_in_list(const ir_variable
, param
, parameters
) {
92 ralloc_asprintf_append(&str
, "%s%s", comma
, param
->type
->name
);
96 ralloc_strcat(&str
, ")");
101 verify_image_parameter(YYLTYPE
*loc
, _mesa_glsl_parse_state
*state
,
102 const ir_variable
*formal
, const ir_variable
*actual
)
105 * From the ARB_shader_image_load_store specification:
107 * "The values of image variables qualified with coherent,
108 * volatile, restrict, readonly, or writeonly may not be passed
109 * to functions whose formal parameters lack such
110 * qualifiers. [...] It is legal to have additional qualifiers
111 * on a formal parameter, but not to have fewer."
113 if (actual
->data
.image_coherent
&& !formal
->data
.image_coherent
) {
114 _mesa_glsl_error(loc
, state
,
115 "function call parameter `%s' drops "
116 "`coherent' qualifier", formal
->name
);
120 if (actual
->data
.image_volatile
&& !formal
->data
.image_volatile
) {
121 _mesa_glsl_error(loc
, state
,
122 "function call parameter `%s' drops "
123 "`volatile' qualifier", formal
->name
);
127 if (actual
->data
.image_restrict
&& !formal
->data
.image_restrict
) {
128 _mesa_glsl_error(loc
, state
,
129 "function call parameter `%s' drops "
130 "`restrict' qualifier", formal
->name
);
134 if (actual
->data
.image_read_only
&& !formal
->data
.image_read_only
) {
135 _mesa_glsl_error(loc
, state
,
136 "function call parameter `%s' drops "
137 "`readonly' qualifier", formal
->name
);
141 if (actual
->data
.image_write_only
&& !formal
->data
.image_write_only
) {
142 _mesa_glsl_error(loc
, state
,
143 "function call parameter `%s' drops "
144 "`writeonly' qualifier", formal
->name
);
152 verify_first_atomic_parameter(YYLTYPE
*loc
, _mesa_glsl_parse_state
*state
,
156 (!var
->is_in_shader_storage_block() &&
157 var
->data
.mode
!= ir_var_shader_shared
)) {
158 _mesa_glsl_error(loc
, state
, "First argument to atomic function "
159 "must be a buffer or shared variable");
166 is_atomic_function(const char *func_name
)
168 return !strcmp(func_name
, "atomicAdd") ||
169 !strcmp(func_name
, "atomicMin") ||
170 !strcmp(func_name
, "atomicMax") ||
171 !strcmp(func_name
, "atomicAnd") ||
172 !strcmp(func_name
, "atomicOr") ||
173 !strcmp(func_name
, "atomicXor") ||
174 !strcmp(func_name
, "atomicExchange") ||
175 !strcmp(func_name
, "atomicCompSwap");
179 * Verify that 'out' and 'inout' actual parameters are lvalues. Also, verify
180 * that 'const_in' formal parameters (an extension in our IR) correspond to
181 * ir_constant actual parameters.
184 verify_parameter_modes(_mesa_glsl_parse_state
*state
,
185 ir_function_signature
*sig
,
186 exec_list
&actual_ir_parameters
,
187 exec_list
&actual_ast_parameters
)
189 exec_node
*actual_ir_node
= actual_ir_parameters
.get_head_raw();
190 exec_node
*actual_ast_node
= actual_ast_parameters
.get_head_raw();
192 foreach_in_list(const ir_variable
, formal
, &sig
->parameters
) {
193 /* The lists must be the same length. */
194 assert(!actual_ir_node
->is_tail_sentinel());
195 assert(!actual_ast_node
->is_tail_sentinel());
197 const ir_rvalue
*const actual
= (ir_rvalue
*) actual_ir_node
;
198 const ast_expression
*const actual_ast
=
199 exec_node_data(ast_expression
, actual_ast_node
, link
);
201 /* FIXME: 'loc' is incorrect (as of 2011-01-21). It is always
204 YYLTYPE loc
= actual_ast
->get_location();
206 /* Verify that 'const_in' parameters are ir_constants. */
207 if (formal
->data
.mode
== ir_var_const_in
&&
208 actual
->ir_type
!= ir_type_constant
) {
209 _mesa_glsl_error(&loc
, state
,
210 "parameter `in %s' must be a constant expression",
215 /* Verify that shader_in parameters are shader inputs */
216 if (formal
->data
.must_be_shader_input
) {
217 const ir_rvalue
*val
= actual
;
219 // GLSL 4.40 allows swizzles, while earlier GLSL versions do not.
220 if (val
->ir_type
== ir_type_swizzle
) {
221 if (!state
->is_version(440, 0)) {
222 _mesa_glsl_error(&loc
, state
,
223 "parameter `%s` must not be swizzled",
227 val
= ((ir_swizzle
*)val
)->val
;
230 while (val
->ir_type
== ir_type_dereference_array
) {
231 val
= ((ir_dereference_array
*)val
)->array
;
234 if (!val
->as_dereference_variable() ||
235 val
->variable_referenced()->data
.mode
!= ir_var_shader_in
) {
236 _mesa_glsl_error(&loc
, state
,
237 "parameter `%s` must be a shader input",
243 /* Verify that 'out' and 'inout' actual parameters are lvalues. */
244 if (formal
->data
.mode
== ir_var_function_out
245 || formal
->data
.mode
== ir_var_function_inout
) {
246 const char *mode
= NULL
;
247 switch (formal
->data
.mode
) {
248 case ir_var_function_out
: mode
= "out"; break;
249 case ir_var_function_inout
: mode
= "inout"; break;
250 default: assert(false); break;
253 /* This AST-based check catches errors like f(i++). The IR-based
254 * is_lvalue() is insufficient because the actual parameter at the
255 * IR-level is just a temporary value, which is an l-value.
257 if (actual_ast
->non_lvalue_description
!= NULL
) {
258 _mesa_glsl_error(&loc
, state
,
259 "function parameter '%s %s' references a %s",
261 actual_ast
->non_lvalue_description
);
265 ir_variable
*var
= actual
->variable_referenced();
267 if (var
&& formal
->data
.mode
== ir_var_function_inout
) {
268 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_shader_out
) &&
269 !var
->data
.assigned
&&
270 !is_gl_identifier(var
->name
)) {
271 _mesa_glsl_warning(&loc
, state
, "`%s' used uninitialized",
277 var
->data
.assigned
= true;
279 if (var
&& var
->data
.read_only
) {
280 _mesa_glsl_error(&loc
, state
,
281 "function parameter '%s %s' references the "
282 "read-only variable '%s'",
284 actual
->variable_referenced()->name
);
286 } else if (!actual
->is_lvalue()) {
287 _mesa_glsl_error(&loc
, state
,
288 "function parameter '%s %s' is not an lvalue",
293 assert(formal
->data
.mode
== ir_var_function_in
||
294 formal
->data
.mode
== ir_var_const_in
);
295 ir_variable
*var
= actual
->variable_referenced();
297 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_shader_out
) &&
298 !var
->data
.assigned
&&
299 !is_gl_identifier(var
->name
)) {
300 _mesa_glsl_warning(&loc
, state
, "`%s' used uninitialized",
306 if (formal
->type
->is_image() &&
307 actual
->variable_referenced()) {
308 if (!verify_image_parameter(&loc
, state
, formal
,
309 actual
->variable_referenced()))
313 actual_ir_node
= actual_ir_node
->next
;
314 actual_ast_node
= actual_ast_node
->next
;
317 /* The first parameter of atomic functions must be a buffer variable */
318 const char *func_name
= sig
->function_name();
319 bool is_atomic
= is_atomic_function(func_name
);
321 const ir_rvalue
*const actual
=
322 (ir_rvalue
*) actual_ir_parameters
.get_head_raw();
324 const ast_expression
*const actual_ast
=
325 exec_node_data(ast_expression
,
326 actual_ast_parameters
.get_head_raw(), link
);
327 YYLTYPE loc
= actual_ast
->get_location();
329 if (!verify_first_atomic_parameter(&loc
, state
,
330 actual
->variable_referenced())) {
339 fix_parameter(void *mem_ctx
, ir_rvalue
*actual
, const glsl_type
*formal_type
,
340 exec_list
*before_instructions
, exec_list
*after_instructions
,
341 bool parameter_is_inout
)
343 ir_expression
*const expr
= actual
->as_expression();
345 /* If the types match exactly and the parameter is not a vector-extract,
346 * nothing needs to be done to fix the parameter.
348 if (formal_type
== actual
->type
349 && (expr
== NULL
|| expr
->operation
!= ir_binop_vector_extract
))
352 /* To convert an out parameter, we need to create a temporary variable to
353 * hold the value before conversion, and then perform the conversion after
354 * the function call returns.
356 * This has the effect of transforming code like this:
362 * Into IR that's equivalent to this:
366 * int out_parameter_conversion;
367 * f(out_parameter_conversion);
368 * value = float(out_parameter_conversion);
370 * If the parameter is an ir_expression of ir_binop_vector_extract,
371 * additional conversion is needed in the post-call re-write.
374 new(mem_ctx
) ir_variable(formal_type
, "inout_tmp", ir_var_temporary
);
376 before_instructions
->push_tail(tmp
);
378 /* If the parameter is an inout parameter, copy the value of the actual
379 * parameter to the new temporary. Note that no type conversion is allowed
380 * here because inout parameters must match types exactly.
382 if (parameter_is_inout
) {
383 /* Inout parameters should never require conversion, since that would
384 * require an implicit conversion to exist both to and from the formal
385 * parameter type, and there are no bidirectional implicit conversions.
387 assert (actual
->type
== formal_type
);
389 ir_dereference_variable
*const deref_tmp_1
=
390 new(mem_ctx
) ir_dereference_variable(tmp
);
391 ir_assignment
*const assignment
=
392 new(mem_ctx
) ir_assignment(deref_tmp_1
, actual
);
393 before_instructions
->push_tail(assignment
);
396 /* Replace the parameter in the call with a dereference of the new
399 ir_dereference_variable
*const deref_tmp_2
=
400 new(mem_ctx
) ir_dereference_variable(tmp
);
401 actual
->replace_with(deref_tmp_2
);
404 /* Copy the temporary variable to the actual parameter with optional
405 * type conversion applied.
407 ir_rvalue
*rhs
= new(mem_ctx
) ir_dereference_variable(tmp
);
408 if (actual
->type
!= formal_type
)
409 rhs
= convert_component(rhs
, actual
->type
);
411 ir_rvalue
*lhs
= actual
;
412 if (expr
!= NULL
&& expr
->operation
== ir_binop_vector_extract
) {
413 lhs
= new(mem_ctx
) ir_dereference_array(expr
->operands
[0]->clone(mem_ctx
, NULL
),
414 expr
->operands
[1]->clone(mem_ctx
, NULL
));
417 ir_assignment
*const assignment_2
= new(mem_ctx
) ir_assignment(lhs
, rhs
);
418 after_instructions
->push_tail(assignment_2
);
422 * Generate a function call.
424 * For non-void functions, this returns a dereference of the temporary variable
425 * which stores the return value for the call. For void functions, this returns
429 generate_call(exec_list
*instructions
, ir_function_signature
*sig
,
430 exec_list
*actual_parameters
,
431 ir_variable
*sub_var
,
432 ir_rvalue
*array_idx
,
433 struct _mesa_glsl_parse_state
*state
)
436 exec_list post_call_conversions
;
438 /* Perform implicit conversion of arguments. For out parameters, we need
439 * to place them in a temporary variable and do the conversion after the
440 * call takes place. Since we haven't emitted the call yet, we'll place
441 * the post-call conversions in a temporary exec_list, and emit them later.
443 foreach_two_lists(formal_node
, &sig
->parameters
,
444 actual_node
, actual_parameters
) {
445 ir_rvalue
*actual
= (ir_rvalue
*) actual_node
;
446 ir_variable
*formal
= (ir_variable
*) formal_node
;
448 if (formal
->type
->is_numeric() || formal
->type
->is_boolean()) {
449 switch (formal
->data
.mode
) {
450 case ir_var_const_in
:
451 case ir_var_function_in
: {
453 = convert_component(actual
, formal
->type
);
454 actual
->replace_with(converted
);
457 case ir_var_function_out
:
458 case ir_var_function_inout
:
459 fix_parameter(ctx
, actual
, formal
->type
,
460 instructions
, &post_call_conversions
,
461 formal
->data
.mode
== ir_var_function_inout
);
464 assert (!"Illegal formal parameter mode");
470 /* Section 4.3.2 (Const) of the GLSL 1.10.59 spec says:
472 * "Initializers for const declarations must be formed from literal
473 * values, other const variables (not including function call
474 * paramaters), or expressions of these.
476 * Constructors may be used in such expressions, but function calls may
479 * Section 4.3.3 (Constant Expressions) of the GLSL 1.20.8 spec says:
481 * "A constant expression is one of
485 * - a built-in function call whose arguments are all constant
486 * expressions, with the exception of the texture lookup
487 * functions, the noise functions, and ftransform. The built-in
488 * functions dFdx, dFdy, and fwidth must return 0 when evaluated
489 * inside an initializer with an argument that is a constant
492 * Section 5.10 (Constant Expressions) of the GLSL ES 1.00.17 spec says:
494 * "A constant expression is one of
498 * - a built-in function call whose arguments are all constant
499 * expressions, with the exception of the texture lookup
502 * Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec says:
504 * "A constant expression is one of
508 * - a built-in function call whose arguments are all constant
509 * expressions, with the exception of the texture lookup
510 * functions. The built-in functions dFdx, dFdy, and fwidth must
511 * return 0 when evaluated inside an initializer with an argument
512 * that is a constant expression."
514 * If the function call is a constant expression, don't generate any
515 * instructions; just generate an ir_constant.
517 if (state
->is_version(120, 100)) {
518 ir_constant
*value
= sig
->constant_expression_value(actual_parameters
, NULL
);
524 ir_dereference_variable
*deref
= NULL
;
525 if (!sig
->return_type
->is_void()) {
526 /* Create a new temporary to hold the return value. */
527 char *const name
= ir_variable::temporaries_allocate_names
528 ? ralloc_asprintf(ctx
, "%s_retval", sig
->function_name())
533 var
= new(ctx
) ir_variable(sig
->return_type
, name
, ir_var_temporary
);
534 instructions
->push_tail(var
);
538 deref
= new(ctx
) ir_dereference_variable(var
);
541 ir_call
*call
= new(ctx
) ir_call(sig
, deref
, actual_parameters
, sub_var
, array_idx
);
542 instructions
->push_tail(call
);
544 /* Also emit any necessary out-parameter conversions. */
545 instructions
->append_list(&post_call_conversions
);
547 return deref
? deref
->clone(ctx
, NULL
) : NULL
;
551 * Given a function name and parameter list, find the matching signature.
553 static ir_function_signature
*
554 match_function_by_name(const char *name
,
555 exec_list
*actual_parameters
,
556 struct _mesa_glsl_parse_state
*state
)
559 ir_function
*f
= state
->symbols
->get_function(name
);
560 ir_function_signature
*local_sig
= NULL
;
561 ir_function_signature
*sig
= NULL
;
563 /* Is the function hidden by a record type constructor? */
564 if (state
->symbols
->get_type(name
))
565 goto done
; /* no match */
567 /* Is the function hidden by a variable (impossible in 1.10)? */
568 if (!state
->symbols
->separate_function_namespace
569 && state
->symbols
->get_variable(name
))
570 goto done
; /* no match */
573 /* In desktop GL, the presence of a user-defined signature hides any
574 * built-in signatures, so we must ignore them. In contrast, in ES2
575 * user-defined signatures add new overloads, so we must consider them.
577 bool allow_builtins
= state
->es_shader
|| !f
->has_user_signature();
579 /* Look for a match in the local shader. If exact, we're done. */
580 bool is_exact
= false;
581 sig
= local_sig
= f
->matching_signature(state
, actual_parameters
,
582 allow_builtins
, &is_exact
);
590 /* Local shader has no exact candidates; check the built-ins. */
591 _mesa_glsl_initialize_builtin_functions();
592 sig
= _mesa_glsl_find_builtin_function(state
, name
, actual_parameters
);
596 /* If the match is from a linked built-in shader, import the prototype. */
597 if (sig
!= local_sig
) {
599 f
= new(ctx
) ir_function(name
);
600 state
->symbols
->add_global_function(f
);
601 emit_function(state
, f
);
603 sig
= sig
->clone_prototype(f
, NULL
);
604 f
->add_signature(sig
);
610 static ir_function_signature
*
611 match_subroutine_by_name(const char *name
,
612 exec_list
*actual_parameters
,
613 struct _mesa_glsl_parse_state
*state
,
617 ir_function_signature
*sig
= NULL
;
618 ir_function
*f
, *found
= NULL
;
619 const char *new_name
;
621 bool is_exact
= false;
623 new_name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), name
);
624 var
= state
->symbols
->get_variable(new_name
);
628 for (int i
= 0; i
< state
->num_subroutine_types
; i
++) {
629 f
= state
->subroutine_types
[i
];
630 if (strcmp(f
->name
, var
->type
->without_array()->name
))
639 sig
= found
->matching_signature(state
, actual_parameters
,
645 generate_array_index(void *mem_ctx
, exec_list
*instructions
,
646 struct _mesa_glsl_parse_state
*state
, YYLTYPE loc
,
647 const ast_expression
*array
, ast_expression
*idx
,
648 const char **function_name
, exec_list
*actual_parameters
)
650 if (array
->oper
== ast_array_index
) {
651 /* This handles arrays of arrays */
652 ir_rvalue
*outer_array
= generate_array_index(mem_ctx
, instructions
,
654 array
->subexpressions
[0],
655 array
->subexpressions
[1],
656 function_name
, actual_parameters
);
657 ir_rvalue
*outer_array_idx
= idx
->hir(instructions
, state
);
659 YYLTYPE index_loc
= idx
->get_location();
660 return _mesa_ast_array_index_to_hir(mem_ctx
, state
, outer_array
,
661 outer_array_idx
, loc
,
664 ir_variable
*sub_var
= NULL
;
665 *function_name
= array
->primary_expression
.identifier
;
667 match_subroutine_by_name(*function_name
, actual_parameters
,
670 ir_rvalue
*outer_array_idx
= idx
->hir(instructions
, state
);
671 return new(mem_ctx
) ir_dereference_array(sub_var
, outer_array_idx
);
676 print_function_prototypes(_mesa_glsl_parse_state
*state
, YYLTYPE
*loc
,
682 foreach_in_list(ir_function_signature
, sig
, &f
->signatures
) {
683 if (sig
->is_builtin() && !sig
->is_builtin_available(state
))
686 char *str
= prototype_string(sig
->return_type
, f
->name
, &sig
->parameters
);
687 _mesa_glsl_error(loc
, state
, " %s", str
);
693 * Raise a "no matching function" error, listing all possible overloads the
694 * compiler considered so developers can figure out what went wrong.
697 no_matching_function_error(const char *name
,
699 exec_list
*actual_parameters
,
700 _mesa_glsl_parse_state
*state
)
702 gl_shader
*sh
= _mesa_glsl_get_builtin_function_shader();
704 if (state
->symbols
->get_function(name
) == NULL
705 && (!state
->uses_builtin_functions
706 || sh
->symbols
->get_function(name
) == NULL
)) {
707 _mesa_glsl_error(loc
, state
, "no function with name '%s'", name
);
709 char *str
= prototype_string(NULL
, name
, actual_parameters
);
710 _mesa_glsl_error(loc
, state
,
711 "no matching function for call to `%s'; candidates are:",
715 print_function_prototypes(state
, loc
, state
->symbols
->get_function(name
));
717 if (state
->uses_builtin_functions
) {
718 print_function_prototypes(state
, loc
, sh
->symbols
->get_function(name
));
724 * Perform automatic type conversion of constructor parameters
726 * This implements the rules in the "Conversion and Scalar Constructors"
727 * section (GLSL 1.10 section 5.4.1), not the "Implicit Conversions" rules.
730 convert_component(ir_rvalue
*src
, const glsl_type
*desired_type
)
732 void *ctx
= ralloc_parent(src
);
733 const unsigned a
= desired_type
->base_type
;
734 const unsigned b
= src
->type
->base_type
;
735 ir_expression
*result
= NULL
;
737 if (src
->type
->is_error())
740 assert(a
<= GLSL_TYPE_BOOL
);
741 assert(b
<= GLSL_TYPE_BOOL
);
750 result
= new(ctx
) ir_expression(ir_unop_i2u
, src
);
752 case GLSL_TYPE_FLOAT
:
753 result
= new(ctx
) ir_expression(ir_unop_f2u
, src
);
756 result
= new(ctx
) ir_expression(ir_unop_i2u
,
757 new(ctx
) ir_expression(ir_unop_b2i
, src
));
759 case GLSL_TYPE_DOUBLE
:
760 result
= new(ctx
) ir_expression(ir_unop_d2u
, src
);
767 result
= new(ctx
) ir_expression(ir_unop_u2i
, src
);
769 case GLSL_TYPE_FLOAT
:
770 result
= new(ctx
) ir_expression(ir_unop_f2i
, src
);
773 result
= new(ctx
) ir_expression(ir_unop_b2i
, src
);
775 case GLSL_TYPE_DOUBLE
:
776 result
= new(ctx
) ir_expression(ir_unop_d2i
, src
);
780 case GLSL_TYPE_FLOAT
:
783 result
= new(ctx
) ir_expression(ir_unop_u2f
, desired_type
, src
, NULL
);
786 result
= new(ctx
) ir_expression(ir_unop_i2f
, desired_type
, src
, NULL
);
789 result
= new(ctx
) ir_expression(ir_unop_b2f
, desired_type
, src
, NULL
);
791 case GLSL_TYPE_DOUBLE
:
792 result
= new(ctx
) ir_expression(ir_unop_d2f
, desired_type
, src
, NULL
);
799 result
= new(ctx
) ir_expression(ir_unop_i2b
,
800 new(ctx
) ir_expression(ir_unop_u2i
, src
));
803 result
= new(ctx
) ir_expression(ir_unop_i2b
, desired_type
, src
, NULL
);
805 case GLSL_TYPE_FLOAT
:
806 result
= new(ctx
) ir_expression(ir_unop_f2b
, desired_type
, src
, NULL
);
808 case GLSL_TYPE_DOUBLE
:
809 result
= new(ctx
) ir_expression(ir_unop_d2b
, desired_type
, src
, NULL
);
813 case GLSL_TYPE_DOUBLE
:
816 result
= new(ctx
) ir_expression(ir_unop_i2d
, src
);
819 result
= new(ctx
) ir_expression(ir_unop_u2d
, src
);
822 result
= new(ctx
) ir_expression(ir_unop_f2d
,
823 new(ctx
) ir_expression(ir_unop_b2f
, src
));
825 case GLSL_TYPE_FLOAT
:
826 result
= new(ctx
) ir_expression(ir_unop_f2d
, desired_type
, src
, NULL
);
831 assert(result
!= NULL
);
832 assert(result
->type
== desired_type
);
834 /* Try constant folding; it may fold in the conversion we just added. */
835 ir_constant
*const constant
= result
->constant_expression_value();
836 return (constant
!= NULL
) ? (ir_rvalue
*) constant
: (ir_rvalue
*) result
;
841 * Perform automatic type and constant conversion of constructor parameters
843 * This implements the rules in the "Implicit Conversions" rules, not the
844 * "Conversion and Scalar Constructors".
846 * After attempting the implicit conversion, an attempt to convert into a
847 * constant valued expression is also done.
849 * The \c from \c ir_rvalue is converted "in place".
851 * \param from Operand that is being converted
852 * \param to Base type the operand will be converted to
853 * \param state GLSL compiler state
856 * If the attempt to convert into a constant expression succeeds, \c true is
857 * returned. Otherwise \c false is returned.
860 implicitly_convert_component(ir_rvalue
* &from
, const glsl_base_type to
,
861 struct _mesa_glsl_parse_state
*state
)
863 ir_rvalue
*result
= from
;
865 if (to
!= from
->type
->base_type
) {
866 const glsl_type
*desired_type
=
867 glsl_type::get_instance(to
,
868 from
->type
->vector_elements
,
869 from
->type
->matrix_columns
);
871 if (from
->type
->can_implicitly_convert_to(desired_type
, state
)) {
872 /* Even though convert_component() implements the constructor
873 * conversion rules (not the implicit conversion rules), its safe
874 * to use it here because we already checked that the implicit
875 * conversion is legal.
877 result
= convert_component(from
, desired_type
);
881 ir_rvalue
*const constant
= result
->constant_expression_value();
883 if (constant
!= NULL
)
886 if (from
!= result
) {
887 from
->replace_with(result
);
891 return constant
!= NULL
;
896 * Dereference a specific component from a scalar, vector, or matrix
899 dereference_component(ir_rvalue
*src
, unsigned component
)
901 void *ctx
= ralloc_parent(src
);
902 assert(component
< src
->type
->components());
904 /* If the source is a constant, just create a new constant instead of a
905 * dereference of the existing constant.
907 ir_constant
*constant
= src
->as_constant();
909 return new(ctx
) ir_constant(constant
, component
);
911 if (src
->type
->is_scalar()) {
913 } else if (src
->type
->is_vector()) {
914 return new(ctx
) ir_swizzle(src
, component
, 0, 0, 0, 1);
916 assert(src
->type
->is_matrix());
918 /* Dereference a row of the matrix, then call this function again to get
919 * a specific element from that row.
921 const int c
= component
/ src
->type
->column_type()->vector_elements
;
922 const int r
= component
% src
->type
->column_type()->vector_elements
;
923 ir_constant
*const col_index
= new(ctx
) ir_constant(c
);
924 ir_dereference
*const col
= new(ctx
) ir_dereference_array(src
, col_index
);
926 col
->type
= src
->type
->column_type();
928 return dereference_component(col
, r
);
931 assert(!"Should not get here.");
937 process_vec_mat_constructor(exec_list
*instructions
,
938 const glsl_type
*constructor_type
,
939 YYLTYPE
*loc
, exec_list
*parameters
,
940 struct _mesa_glsl_parse_state
*state
)
944 /* The ARB_shading_language_420pack spec says:
946 * "If an initializer is a list of initializers enclosed in curly braces,
947 * the variable being declared must be a vector, a matrix, an array, or a
950 * int i = { 1 }; // illegal, i is not an aggregate"
952 if (constructor_type
->vector_elements
<= 1) {
953 _mesa_glsl_error(loc
, state
, "aggregates can only initialize vectors, "
954 "matrices, arrays, and structs");
955 return ir_rvalue::error_value(ctx
);
958 exec_list actual_parameters
;
959 const unsigned parameter_count
=
960 process_parameters(instructions
, &actual_parameters
, parameters
, state
);
962 if (parameter_count
== 0
963 || (constructor_type
->is_vector() &&
964 constructor_type
->vector_elements
!= parameter_count
)
965 || (constructor_type
->is_matrix() &&
966 constructor_type
->matrix_columns
!= parameter_count
)) {
967 _mesa_glsl_error(loc
, state
, "%s constructor must have %u parameters",
968 constructor_type
->is_vector() ? "vector" : "matrix",
969 constructor_type
->vector_elements
);
970 return ir_rvalue::error_value(ctx
);
973 bool all_parameters_are_constant
= true;
975 /* Type cast each parameter and, if possible, fold constants. */
976 foreach_in_list_safe(ir_rvalue
, ir
, &actual_parameters
) {
977 /* Apply implicit conversions (not the scalar constructor rules, see the
978 * spec quote above!) and attempt to convert the parameter to a constant
979 * valued expression. After doing so, track whether or not all the
980 * parameters to the constructor are trivially constant valued
983 all_parameters_are_constant
&=
984 implicitly_convert_component(ir
, constructor_type
->base_type
, state
);
986 if (constructor_type
->is_matrix()) {
987 if (ir
->type
!= constructor_type
->column_type()) {
988 _mesa_glsl_error(loc
, state
, "type error in matrix constructor: "
989 "expected: %s, found %s",
990 constructor_type
->column_type()->name
,
992 return ir_rvalue::error_value(ctx
);
994 } else if (ir
->type
!= constructor_type
->get_scalar_type()) {
995 _mesa_glsl_error(loc
, state
, "type error in vector constructor: "
996 "expected: %s, found %s",
997 constructor_type
->get_scalar_type()->name
,
999 return ir_rvalue::error_value(ctx
);
1003 if (all_parameters_are_constant
)
1004 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
1006 ir_variable
*var
= new(ctx
) ir_variable(constructor_type
, "vec_mat_ctor",
1008 instructions
->push_tail(var
);
1012 foreach_in_list(ir_rvalue
, rhs
, &actual_parameters
) {
1013 ir_instruction
*assignment
= NULL
;
1015 if (var
->type
->is_matrix()) {
1016 ir_rvalue
*lhs
= new(ctx
) ir_dereference_array(var
,
1017 new(ctx
) ir_constant(i
));
1018 assignment
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
1020 /* use writemask rather than index for vector */
1021 assert(var
->type
->is_vector());
1023 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
1024 assignment
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
, (unsigned)(1 << i
));
1027 instructions
->push_tail(assignment
);
1032 return new(ctx
) ir_dereference_variable(var
);
1037 process_array_constructor(exec_list
*instructions
,
1038 const glsl_type
*constructor_type
,
1039 YYLTYPE
*loc
, exec_list
*parameters
,
1040 struct _mesa_glsl_parse_state
*state
)
1043 /* Array constructors come in two forms: sized and unsized. Sized array
1044 * constructors look like 'vec4[2](a, b)', where 'a' and 'b' are vec4
1045 * variables. In this case the number of parameters must exactly match the
1046 * specified size of the array.
1048 * Unsized array constructors look like 'vec4[](a, b)', where 'a' and 'b'
1049 * are vec4 variables. In this case the size of the array being constructed
1050 * is determined by the number of parameters.
1052 * From page 52 (page 58 of the PDF) of the GLSL 1.50 spec:
1054 * "There must be exactly the same number of arguments as the size of
1055 * the array being constructed. If no size is present in the
1056 * constructor, then the array is explicitly sized to the number of
1057 * arguments provided. The arguments are assigned in order, starting at
1058 * element 0, to the elements of the constructed array. Each argument
1059 * must be the same type as the element type of the array, or be a type
1060 * that can be converted to the element type of the array according to
1061 * Section 4.1.10 "Implicit Conversions.""
1063 exec_list actual_parameters
;
1064 const unsigned parameter_count
=
1065 process_parameters(instructions
, &actual_parameters
, parameters
, state
);
1066 bool is_unsized_array
= constructor_type
->is_unsized_array();
1068 if ((parameter_count
== 0) ||
1069 (!is_unsized_array
&& (constructor_type
->length
!= parameter_count
))) {
1070 const unsigned min_param
= is_unsized_array
1071 ? 1 : constructor_type
->length
;
1073 _mesa_glsl_error(loc
, state
, "array constructor must have %s %u "
1075 is_unsized_array
? "at least" : "exactly",
1076 min_param
, (min_param
<= 1) ? "" : "s");
1077 return ir_rvalue::error_value(ctx
);
1080 if (is_unsized_array
) {
1082 glsl_type::get_array_instance(constructor_type
->fields
.array
,
1084 assert(constructor_type
!= NULL
);
1085 assert(constructor_type
->length
== parameter_count
);
1088 bool all_parameters_are_constant
= true;
1089 const glsl_type
*element_type
= constructor_type
->fields
.array
;
1091 /* Type cast each parameter and, if possible, fold constants. */
1092 foreach_in_list_safe(ir_rvalue
, ir
, &actual_parameters
) {
1093 /* Apply implicit conversions (not the scalar constructor rules, see the
1094 * spec quote above!) and attempt to convert the parameter to a constant
1095 * valued expression. After doing so, track whether or not all the
1096 * parameters to the constructor are trivially constant valued
1099 all_parameters_are_constant
&=
1100 implicitly_convert_component(ir
, element_type
->base_type
, state
);
1102 if (constructor_type
->fields
.array
->is_unsized_array()) {
1103 /* As the inner parameters of the constructor are created without
1104 * knowledge of each other we need to check to make sure unsized
1105 * parameters of unsized constructors all end up with the same size.
1107 * e.g we make sure to fail for a constructor like this:
1108 * vec4[][] a = vec4[][](vec4[](vec4(0.0), vec4(1.0)),
1109 * vec4[](vec4(0.0), vec4(1.0), vec4(1.0)),
1110 * vec4[](vec4(0.0), vec4(1.0)));
1112 if (element_type
->is_unsized_array()) {
1113 /* This is the first parameter so just get the type */
1114 element_type
= ir
->type
;
1115 } else if (element_type
!= ir
->type
) {
1116 _mesa_glsl_error(loc
, state
, "type error in array constructor: "
1117 "expected: %s, found %s",
1120 return ir_rvalue::error_value(ctx
);
1122 } else if (ir
->type
!= constructor_type
->fields
.array
) {
1123 _mesa_glsl_error(loc
, state
, "type error in array constructor: "
1124 "expected: %s, found %s",
1125 constructor_type
->fields
.array
->name
,
1127 return ir_rvalue::error_value(ctx
);
1129 element_type
= ir
->type
;
1133 if (constructor_type
->fields
.array
->is_unsized_array()) {
1135 glsl_type::get_array_instance(element_type
,
1137 assert(constructor_type
!= NULL
);
1138 assert(constructor_type
->length
== parameter_count
);
1141 if (all_parameters_are_constant
)
1142 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
1144 ir_variable
*var
= new(ctx
) ir_variable(constructor_type
, "array_ctor",
1146 instructions
->push_tail(var
);
1149 foreach_in_list(ir_rvalue
, rhs
, &actual_parameters
) {
1150 ir_rvalue
*lhs
= new(ctx
) ir_dereference_array(var
,
1151 new(ctx
) ir_constant(i
));
1153 ir_instruction
*assignment
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
1154 instructions
->push_tail(assignment
);
1159 return new(ctx
) ir_dereference_variable(var
);
1164 * Determine if a list consists of a single scalar r-value
1167 single_scalar_parameter(exec_list
*parameters
)
1169 const ir_rvalue
*const p
= (ir_rvalue
*) parameters
->get_head_raw();
1170 assert(((ir_rvalue
*)p
)->as_rvalue() != NULL
);
1172 return (p
->type
->is_scalar() && p
->next
->is_tail_sentinel());
1177 * Generate inline code for a vector constructor
1179 * The generated constructor code will consist of a temporary variable
1180 * declaration of the same type as the constructor. A sequence of assignments
1181 * from constructor parameters to the temporary will follow.
1184 * An \c ir_dereference_variable of the temprorary generated in the constructor
1188 emit_inline_vector_constructor(const glsl_type
*type
,
1189 exec_list
*instructions
,
1190 exec_list
*parameters
,
1193 assert(!parameters
->is_empty());
1195 ir_variable
*var
= new(ctx
) ir_variable(type
, "vec_ctor", ir_var_temporary
);
1196 instructions
->push_tail(var
);
1198 /* There are three kinds of vector constructors.
1200 * - Construct a vector from a single scalar by replicating that scalar to
1201 * all components of the vector.
1203 * - Construct a vector from at least a matrix. This case should already
1204 * have been taken care of in ast_function_expression::hir by breaking
1205 * down the matrix into a series of column vectors.
1207 * - Construct a vector from an arbirary combination of vectors and
1208 * scalars. The components of the constructor parameters are assigned
1209 * to the vector in order until the vector is full.
1211 const unsigned lhs_components
= type
->components();
1212 if (single_scalar_parameter(parameters
)) {
1213 ir_rvalue
*first_param
= (ir_rvalue
*)parameters
->get_head_raw();
1214 ir_rvalue
*rhs
= new(ctx
) ir_swizzle(first_param
, 0, 0, 0, 0,
1216 ir_dereference_variable
*lhs
= new(ctx
) ir_dereference_variable(var
);
1217 const unsigned mask
= (1U << lhs_components
) - 1;
1219 assert(rhs
->type
== lhs
->type
);
1221 ir_instruction
*inst
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
, mask
);
1222 instructions
->push_tail(inst
);
1224 unsigned base_component
= 0;
1225 unsigned base_lhs_component
= 0;
1226 ir_constant_data data
;
1227 unsigned constant_mask
= 0, constant_components
= 0;
1229 memset(&data
, 0, sizeof(data
));
1231 foreach_in_list(ir_rvalue
, param
, parameters
) {
1232 unsigned rhs_components
= param
->type
->components();
1234 /* Do not try to assign more components to the vector than it has!
1236 if ((rhs_components
+ base_lhs_component
) > lhs_components
) {
1237 rhs_components
= lhs_components
- base_lhs_component
;
1240 const ir_constant
*const c
= param
->as_constant();
1242 for (unsigned i
= 0; i
< rhs_components
; i
++) {
1243 switch (c
->type
->base_type
) {
1244 case GLSL_TYPE_UINT
:
1245 data
.u
[i
+ base_component
] = c
->get_uint_component(i
);
1248 data
.i
[i
+ base_component
] = c
->get_int_component(i
);
1250 case GLSL_TYPE_FLOAT
:
1251 data
.f
[i
+ base_component
] = c
->get_float_component(i
);
1253 case GLSL_TYPE_DOUBLE
:
1254 data
.d
[i
+ base_component
] = c
->get_double_component(i
);
1256 case GLSL_TYPE_BOOL
:
1257 data
.b
[i
+ base_component
] = c
->get_bool_component(i
);
1260 assert(!"Should not get here.");
1265 /* Mask of fields to be written in the assignment.
1267 constant_mask
|= ((1U << rhs_components
) - 1) << base_lhs_component
;
1268 constant_components
+= rhs_components
;
1270 base_component
+= rhs_components
;
1272 /* Advance the component index by the number of components
1273 * that were just assigned.
1275 base_lhs_component
+= rhs_components
;
1278 if (constant_mask
!= 0) {
1279 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
1280 const glsl_type
*rhs_type
= glsl_type::get_instance(var
->type
->base_type
,
1281 constant_components
,
1283 ir_rvalue
*rhs
= new(ctx
) ir_constant(rhs_type
, &data
);
1285 ir_instruction
*inst
=
1286 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, constant_mask
);
1287 instructions
->push_tail(inst
);
1291 foreach_in_list(ir_rvalue
, param
, parameters
) {
1292 unsigned rhs_components
= param
->type
->components();
1294 /* Do not try to assign more components to the vector than it has!
1296 if ((rhs_components
+ base_component
) > lhs_components
) {
1297 rhs_components
= lhs_components
- base_component
;
1300 /* If we do not have any components left to copy, break out of the
1301 * loop. This can happen when initializing a vec4 with a mat3 as the
1302 * mat3 would have been broken into a series of column vectors.
1304 if (rhs_components
== 0) {
1308 const ir_constant
*const c
= param
->as_constant();
1310 /* Mask of fields to be written in the assignment.
1312 const unsigned write_mask
= ((1U << rhs_components
) - 1)
1315 ir_dereference
*lhs
= new(ctx
) ir_dereference_variable(var
);
1317 /* Generate a swizzle so that LHS and RHS sizes match.
1320 new(ctx
) ir_swizzle(param
, 0, 1, 2, 3, rhs_components
);
1322 ir_instruction
*inst
=
1323 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, write_mask
);
1324 instructions
->push_tail(inst
);
1327 /* Advance the component index by the number of components that were
1330 base_component
+= rhs_components
;
1333 return new(ctx
) ir_dereference_variable(var
);
1338 * Generate assignment of a portion of a vector to a portion of a matrix column
1340 * \param src_base First component of the source to be used in assignment
1341 * \param column Column of destination to be assiged
1342 * \param row_base First component of the destination column to be assigned
1343 * \param count Number of components to be assigned
1346 * \c src_base + \c count must be less than or equal to the number of components
1347 * in the source vector.
1350 assign_to_matrix_column(ir_variable
*var
, unsigned column
, unsigned row_base
,
1351 ir_rvalue
*src
, unsigned src_base
, unsigned count
,
1354 ir_constant
*col_idx
= new(mem_ctx
) ir_constant(column
);
1355 ir_dereference
*column_ref
= new(mem_ctx
) ir_dereference_array(var
, col_idx
);
1357 assert(column_ref
->type
->components() >= (row_base
+ count
));
1358 assert(src
->type
->components() >= (src_base
+ count
));
1360 /* Generate a swizzle that extracts the number of components from the source
1361 * that are to be assigned to the column of the matrix.
1363 if (count
< src
->type
->vector_elements
) {
1364 src
= new(mem_ctx
) ir_swizzle(src
,
1365 src_base
+ 0, src_base
+ 1,
1366 src_base
+ 2, src_base
+ 3,
1370 /* Mask of fields to be written in the assignment.
1372 const unsigned write_mask
= ((1U << count
) - 1) << row_base
;
1374 return new(mem_ctx
) ir_assignment(column_ref
, src
, NULL
, write_mask
);
1379 * Generate inline code for a matrix constructor
1381 * The generated constructor code will consist of a temporary variable
1382 * declaration of the same type as the constructor. A sequence of assignments
1383 * from constructor parameters to the temporary will follow.
1386 * An \c ir_dereference_variable of the temprorary generated in the constructor
1390 emit_inline_matrix_constructor(const glsl_type
*type
,
1391 exec_list
*instructions
,
1392 exec_list
*parameters
,
1395 assert(!parameters
->is_empty());
1397 ir_variable
*var
= new(ctx
) ir_variable(type
, "mat_ctor", ir_var_temporary
);
1398 instructions
->push_tail(var
);
1400 /* There are three kinds of matrix constructors.
1402 * - Construct a matrix from a single scalar by replicating that scalar to
1403 * along the diagonal of the matrix and setting all other components to
1406 * - Construct a matrix from an arbirary combination of vectors and
1407 * scalars. The components of the constructor parameters are assigned
1408 * to the matrix in column-major order until the matrix is full.
1410 * - Construct a matrix from a single matrix. The source matrix is copied
1411 * to the upper left portion of the constructed matrix, and the remaining
1412 * elements take values from the identity matrix.
1414 ir_rvalue
*const first_param
= (ir_rvalue
*) parameters
->get_head_raw();
1415 if (single_scalar_parameter(parameters
)) {
1416 /* Assign the scalar to the X component of a vec4, and fill the remaining
1417 * components with zero.
1419 glsl_base_type param_base_type
= first_param
->type
->base_type
;
1420 assert(param_base_type
== GLSL_TYPE_FLOAT
||
1421 param_base_type
== GLSL_TYPE_DOUBLE
);
1422 ir_variable
*rhs_var
=
1423 new(ctx
) ir_variable(glsl_type::get_instance(param_base_type
, 4, 1),
1426 instructions
->push_tail(rhs_var
);
1428 ir_constant_data zero
;
1429 for (unsigned i
= 0; i
< 4; i
++)
1430 if (param_base_type
== GLSL_TYPE_FLOAT
)
1435 ir_instruction
*inst
=
1436 new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(rhs_var
),
1437 new(ctx
) ir_constant(rhs_var
->type
, &zero
),
1439 instructions
->push_tail(inst
);
1441 ir_dereference
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1443 inst
= new(ctx
) ir_assignment(rhs_ref
, first_param
, NULL
, 0x01);
1444 instructions
->push_tail(inst
);
1446 /* Assign the temporary vector to each column of the destination matrix
1447 * with a swizzle that puts the X component on the diagonal of the
1448 * matrix. In some cases this may mean that the X component does not
1449 * get assigned into the column at all (i.e., when the matrix has more
1450 * columns than rows).
1452 static const unsigned rhs_swiz
[4][4] = {
1459 const unsigned cols_to_init
= MIN2(type
->matrix_columns
,
1460 type
->vector_elements
);
1461 for (unsigned i
= 0; i
< cols_to_init
; i
++) {
1462 ir_constant
*const col_idx
= new(ctx
) ir_constant(i
);
1463 ir_rvalue
*const col_ref
= new(ctx
) ir_dereference_array(var
, col_idx
);
1465 ir_rvalue
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1466 ir_rvalue
*const rhs
= new(ctx
) ir_swizzle(rhs_ref
, rhs_swiz
[i
],
1467 type
->vector_elements
);
1469 inst
= new(ctx
) ir_assignment(col_ref
, rhs
, NULL
);
1470 instructions
->push_tail(inst
);
1473 for (unsigned i
= cols_to_init
; i
< type
->matrix_columns
; i
++) {
1474 ir_constant
*const col_idx
= new(ctx
) ir_constant(i
);
1475 ir_rvalue
*const col_ref
= new(ctx
) ir_dereference_array(var
, col_idx
);
1477 ir_rvalue
*const rhs_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1478 ir_rvalue
*const rhs
= new(ctx
) ir_swizzle(rhs_ref
, 1, 1, 1, 1,
1479 type
->vector_elements
);
1481 inst
= new(ctx
) ir_assignment(col_ref
, rhs
, NULL
);
1482 instructions
->push_tail(inst
);
1484 } else if (first_param
->type
->is_matrix()) {
1485 /* From page 50 (56 of the PDF) of the GLSL 1.50 spec:
1487 * "If a matrix is constructed from a matrix, then each component
1488 * (column i, row j) in the result that has a corresponding
1489 * component (column i, row j) in the argument will be initialized
1490 * from there. All other components will be initialized to the
1491 * identity matrix. If a matrix argument is given to a matrix
1492 * constructor, it is an error to have any other arguments."
1494 assert(first_param
->next
->is_tail_sentinel());
1495 ir_rvalue
*const src_matrix
= first_param
;
1497 /* If the source matrix is smaller, pre-initialize the relavent parts of
1498 * the destination matrix to the identity matrix.
1500 if ((src_matrix
->type
->matrix_columns
< var
->type
->matrix_columns
) ||
1501 (src_matrix
->type
->vector_elements
< var
->type
->vector_elements
)) {
1503 /* If the source matrix has fewer rows, every column of the destination
1504 * must be initialized. Otherwise only the columns in the destination
1505 * that do not exist in the source must be initialized.
1508 (src_matrix
->type
->vector_elements
< var
->type
->vector_elements
)
1509 ? 0 : src_matrix
->type
->matrix_columns
;
1511 const glsl_type
*const col_type
= var
->type
->column_type();
1512 for (/* empty */; col
< var
->type
->matrix_columns
; col
++) {
1513 ir_constant_data ident
;
1515 if (!col_type
->is_double()) {
1520 ident
.f
[col
] = 1.0f
;
1529 ir_rvalue
*const rhs
= new(ctx
) ir_constant(col_type
, &ident
);
1531 ir_rvalue
*const lhs
=
1532 new(ctx
) ir_dereference_array(var
, new(ctx
) ir_constant(col
));
1534 ir_instruction
*inst
= new(ctx
) ir_assignment(lhs
, rhs
, NULL
);
1535 instructions
->push_tail(inst
);
1539 /* Assign columns from the source matrix to the destination matrix.
1541 * Since the parameter will be used in the RHS of multiple assignments,
1542 * generate a temporary and copy the paramter there.
1544 ir_variable
*const rhs_var
=
1545 new(ctx
) ir_variable(first_param
->type
, "mat_ctor_mat",
1547 instructions
->push_tail(rhs_var
);
1549 ir_dereference
*const rhs_var_ref
=
1550 new(ctx
) ir_dereference_variable(rhs_var
);
1551 ir_instruction
*const inst
=
1552 new(ctx
) ir_assignment(rhs_var_ref
, first_param
, NULL
);
1553 instructions
->push_tail(inst
);
1555 const unsigned last_row
= MIN2(src_matrix
->type
->vector_elements
,
1556 var
->type
->vector_elements
);
1557 const unsigned last_col
= MIN2(src_matrix
->type
->matrix_columns
,
1558 var
->type
->matrix_columns
);
1560 unsigned swiz
[4] = { 0, 0, 0, 0 };
1561 for (unsigned i
= 1; i
< last_row
; i
++)
1564 const unsigned write_mask
= (1U << last_row
) - 1;
1566 for (unsigned i
= 0; i
< last_col
; i
++) {
1567 ir_dereference
*const lhs
=
1568 new(ctx
) ir_dereference_array(var
, new(ctx
) ir_constant(i
));
1569 ir_rvalue
*const rhs_col
=
1570 new(ctx
) ir_dereference_array(rhs_var
, new(ctx
) ir_constant(i
));
1572 /* If one matrix has columns that are smaller than the columns of the
1573 * other matrix, wrap the column access of the larger with a swizzle
1574 * so that the LHS and RHS of the assignment have the same size (and
1575 * therefore have the same type).
1577 * It would be perfectly valid to unconditionally generate the
1578 * swizzles, this this will typically result in a more compact IR tree.
1581 if (lhs
->type
->vector_elements
!= rhs_col
->type
->vector_elements
) {
1582 rhs
= new(ctx
) ir_swizzle(rhs_col
, swiz
, last_row
);
1587 ir_instruction
*inst
=
1588 new(ctx
) ir_assignment(lhs
, rhs
, NULL
, write_mask
);
1589 instructions
->push_tail(inst
);
1592 const unsigned cols
= type
->matrix_columns
;
1593 const unsigned rows
= type
->vector_elements
;
1594 unsigned remaining_slots
= rows
* cols
;
1595 unsigned col_idx
= 0;
1596 unsigned row_idx
= 0;
1598 foreach_in_list(ir_rvalue
, rhs
, parameters
) {
1599 unsigned rhs_components
= rhs
->type
->components();
1600 unsigned rhs_base
= 0;
1602 if (remaining_slots
== 0)
1605 /* Since the parameter might be used in the RHS of two assignments,
1606 * generate a temporary and copy the paramter there.
1608 ir_variable
*rhs_var
=
1609 new(ctx
) ir_variable(rhs
->type
, "mat_ctor_vec", ir_var_temporary
);
1610 instructions
->push_tail(rhs_var
);
1612 ir_dereference
*rhs_var_ref
=
1613 new(ctx
) ir_dereference_variable(rhs_var
);
1614 ir_instruction
*inst
= new(ctx
) ir_assignment(rhs_var_ref
, rhs
, NULL
);
1615 instructions
->push_tail(inst
);
1618 /* Assign the current parameter to as many components of the matrix
1621 * NOTE: A single vector parameter can span two matrix columns. A
1622 * single vec4, for example, can completely fill a mat2.
1624 unsigned count
= MIN2(rows
- row_idx
,
1625 rhs_components
- rhs_base
);
1627 rhs_var_ref
= new(ctx
) ir_dereference_variable(rhs_var
);
1628 ir_instruction
*inst
= assign_to_matrix_column(var
, col_idx
,
1633 instructions
->push_tail(inst
);
1636 remaining_slots
-= count
;
1638 /* Sometimes, there is still data left in the parameters and
1639 * components left to be set in the destination but in other
1642 if (row_idx
>= rows
) {
1646 } while(remaining_slots
> 0 && rhs_base
< rhs_components
);
1650 return new(ctx
) ir_dereference_variable(var
);
1655 emit_inline_record_constructor(const glsl_type
*type
,
1656 exec_list
*instructions
,
1657 exec_list
*parameters
,
1660 ir_variable
*const var
=
1661 new(mem_ctx
) ir_variable(type
, "record_ctor", ir_var_temporary
);
1662 ir_dereference_variable
*const d
= new(mem_ctx
) ir_dereference_variable(var
);
1664 instructions
->push_tail(var
);
1666 exec_node
*node
= parameters
->get_head_raw();
1667 for (unsigned i
= 0; i
< type
->length
; i
++) {
1668 assert(!node
->is_tail_sentinel());
1670 ir_dereference
*const lhs
=
1671 new(mem_ctx
) ir_dereference_record(d
->clone(mem_ctx
, NULL
),
1672 type
->fields
.structure
[i
].name
);
1674 ir_rvalue
*const rhs
= ((ir_instruction
*) node
)->as_rvalue();
1675 assert(rhs
!= NULL
);
1677 ir_instruction
*const assign
= new(mem_ctx
) ir_assignment(lhs
, rhs
, NULL
);
1679 instructions
->push_tail(assign
);
1688 process_record_constructor(exec_list
*instructions
,
1689 const glsl_type
*constructor_type
,
1690 YYLTYPE
*loc
, exec_list
*parameters
,
1691 struct _mesa_glsl_parse_state
*state
)
1694 /* From page 32 (page 38 of the PDF) of the GLSL 1.20 spec:
1696 * "The arguments to the constructor will be used to set the structure's
1697 * fields, in order, using one argument per field. Each argument must
1698 * be the same type as the field it sets, or be a type that can be
1699 * converted to the field's type according to Section 4.1.10 “Implicit
1702 * From page 35 (page 41 of the PDF) of the GLSL 4.20 spec:
1704 * "In all cases, the innermost initializer (i.e., not a list of
1705 * initializers enclosed in curly braces) applied to an object must
1706 * have the same type as the object being initialized or be a type that
1707 * can be converted to the object's type according to section 4.1.10
1708 * "Implicit Conversions". In the latter case, an implicit conversion
1709 * will be done on the initializer before the assignment is done."
1711 exec_list actual_parameters
;
1713 const unsigned parameter_count
=
1714 process_parameters(instructions
, &actual_parameters
, parameters
,
1717 if (parameter_count
!= constructor_type
->length
) {
1718 _mesa_glsl_error(loc
, state
,
1719 "%s parameters in constructor for `%s'",
1720 parameter_count
> constructor_type
->length
1721 ? "too many": "insufficient",
1722 constructor_type
->name
);
1723 return ir_rvalue::error_value(ctx
);
1726 bool all_parameters_are_constant
= true;
1729 /* Type cast each parameter and, if possible, fold constants. */
1730 foreach_in_list_safe(ir_rvalue
, ir
, &actual_parameters
) {
1732 const glsl_struct_field
*struct_field
=
1733 &constructor_type
->fields
.structure
[i
];
1735 /* Apply implicit conversions (not the scalar constructor rules, see the
1736 * spec quote above!) and attempt to convert the parameter to a constant
1737 * valued expression. After doing so, track whether or not all the
1738 * parameters to the constructor are trivially constant valued
1741 all_parameters_are_constant
&=
1742 implicitly_convert_component(ir
, struct_field
->type
->base_type
,
1745 if (ir
->type
!= struct_field
->type
) {
1746 _mesa_glsl_error(loc
, state
,
1747 "parameter type mismatch in constructor for `%s.%s' "
1749 constructor_type
->name
,
1752 struct_field
->type
->name
);
1753 return ir_rvalue::error_value(ctx
);
1759 if (all_parameters_are_constant
) {
1760 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
1762 return emit_inline_record_constructor(constructor_type
, instructions
,
1763 &actual_parameters
, state
);
1768 ast_function_expression::handle_method(exec_list
*instructions
,
1769 struct _mesa_glsl_parse_state
*state
)
1771 const ast_expression
*field
= subexpressions
[0];
1775 /* Handle "method calls" in GLSL 1.20 - namely, array.length() */
1776 YYLTYPE loc
= get_location();
1777 state
->check_version(120, 300, &loc
, "methods not supported");
1780 method
= field
->primary_expression
.identifier
;
1782 /* This would prevent to raise "uninitialized variable" warnings when
1783 * calling array.length.
1785 field
->subexpressions
[0]->set_is_lhs(true);
1786 op
= field
->subexpressions
[0]->hir(instructions
, state
);
1787 if (strcmp(method
, "length") == 0) {
1788 if (!this->expressions
.is_empty()) {
1789 _mesa_glsl_error(&loc
, state
, "length method takes no arguments");
1793 if (op
->type
->is_array()) {
1794 if (op
->type
->is_unsized_array()) {
1795 if (!state
->has_shader_storage_buffer_objects()) {
1796 _mesa_glsl_error(&loc
, state
, "length called on unsized array"
1797 " only available with "
1798 "ARB_shader_storage_buffer_object");
1800 /* Calculate length of an unsized array in run-time */
1801 result
= new(ctx
) ir_expression(ir_unop_ssbo_unsized_array_length
, op
);
1803 result
= new(ctx
) ir_constant(op
->type
->array_size());
1805 } else if (op
->type
->is_vector()) {
1806 if (state
->has_420pack()) {
1807 /* .length() returns int. */
1808 result
= new(ctx
) ir_constant((int) op
->type
->vector_elements
);
1810 _mesa_glsl_error(&loc
, state
, "length method on matrix only available"
1811 "with ARB_shading_language_420pack");
1814 } else if (op
->type
->is_matrix()) {
1815 if (state
->has_420pack()) {
1816 /* .length() returns int. */
1817 result
= new(ctx
) ir_constant((int) op
->type
->matrix_columns
);
1819 _mesa_glsl_error(&loc
, state
, "length method on matrix only available"
1820 "with ARB_shading_language_420pack");
1824 _mesa_glsl_error(&loc
, state
, "length called on scalar.");
1828 _mesa_glsl_error(&loc
, state
, "unknown method: `%s'", method
);
1833 return ir_rvalue::error_value(ctx
);
1837 ast_function_expression::hir(exec_list
*instructions
,
1838 struct _mesa_glsl_parse_state
*state
)
1841 /* There are three sorts of function calls.
1843 * 1. constructors - The first subexpression is an ast_type_specifier.
1844 * 2. methods - Only the .length() method of array types.
1845 * 3. functions - Calls to regular old functions.
1848 if (is_constructor()) {
1849 const ast_type_specifier
*type
= (ast_type_specifier
*) subexpressions
[0];
1850 YYLTYPE loc
= type
->get_location();
1853 const glsl_type
*const constructor_type
= type
->glsl_type(& name
, state
);
1855 /* constructor_type can be NULL if a variable with the same name as the
1856 * structure has come into scope.
1858 if (constructor_type
== NULL
) {
1859 _mesa_glsl_error(& loc
, state
, "unknown type `%s' (structure name "
1860 "may be shadowed by a variable with the same name)",
1862 return ir_rvalue::error_value(ctx
);
1866 /* Constructors for opaque types are illegal.
1868 if (constructor_type
->contains_opaque()) {
1869 _mesa_glsl_error(& loc
, state
, "cannot construct opaque type `%s'",
1870 constructor_type
->name
);
1871 return ir_rvalue::error_value(ctx
);
1874 if (constructor_type
->is_subroutine()) {
1875 _mesa_glsl_error(& loc
, state
, "subroutine name cannot be a constructor `%s'",
1876 constructor_type
->name
);
1877 return ir_rvalue::error_value(ctx
);
1880 if (constructor_type
->is_array()) {
1881 if (!state
->check_version(120, 300, &loc
,
1882 "array constructors forbidden")) {
1883 return ir_rvalue::error_value(ctx
);
1886 return process_array_constructor(instructions
, constructor_type
,
1887 & loc
, &this->expressions
, state
);
1891 /* There are two kinds of constructor calls. Constructors for arrays and
1892 * structures must have the exact number of arguments with matching types
1893 * in the correct order. These constructors follow essentially the same
1894 * type matching rules as functions.
1896 * Constructors for built-in language types, such as mat4 and vec2, are
1897 * free form. The only requirements are that the parameters must provide
1898 * enough values of the correct scalar type and that no arguments are
1899 * given past the last used argument.
1901 * When using the C-style initializer syntax from GLSL 4.20, constructors
1902 * must have the exact number of arguments with matching types in the
1905 if (constructor_type
->is_record()) {
1906 return process_record_constructor(instructions
, constructor_type
,
1907 &loc
, &this->expressions
,
1911 if (!constructor_type
->is_numeric() && !constructor_type
->is_boolean())
1912 return ir_rvalue::error_value(ctx
);
1914 /* Total number of components of the type being constructed. */
1915 const unsigned type_components
= constructor_type
->components();
1917 /* Number of components from parameters that have actually been
1918 * consumed. This is used to perform several kinds of error checking.
1920 unsigned components_used
= 0;
1922 unsigned matrix_parameters
= 0;
1923 unsigned nonmatrix_parameters
= 0;
1924 exec_list actual_parameters
;
1926 foreach_list_typed(ast_node
, ast
, link
, &this->expressions
) {
1927 ir_rvalue
*result
= ast
->hir(instructions
, state
);
1929 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
1931 * "It is an error to provide extra arguments beyond this
1932 * last used argument."
1934 if (components_used
>= type_components
) {
1935 _mesa_glsl_error(& loc
, state
, "too many parameters to `%s' "
1937 constructor_type
->name
);
1938 return ir_rvalue::error_value(ctx
);
1941 if (!result
->type
->is_numeric() && !result
->type
->is_boolean()) {
1942 _mesa_glsl_error(& loc
, state
, "cannot construct `%s' from a "
1943 "non-numeric data type",
1944 constructor_type
->name
);
1945 return ir_rvalue::error_value(ctx
);
1948 /* Count the number of matrix and nonmatrix parameters. This
1949 * is used below to enforce some of the constructor rules.
1951 if (result
->type
->is_matrix())
1952 matrix_parameters
++;
1954 nonmatrix_parameters
++;
1956 actual_parameters
.push_tail(result
);
1957 components_used
+= result
->type
->components();
1960 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
1962 * "It is an error to construct matrices from other matrices. This
1963 * is reserved for future use."
1965 if (matrix_parameters
> 0
1966 && constructor_type
->is_matrix()
1967 && !state
->check_version(120, 100, &loc
,
1968 "cannot construct `%s' from a matrix",
1969 constructor_type
->name
)) {
1970 return ir_rvalue::error_value(ctx
);
1973 /* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
1975 * "If a matrix argument is given to a matrix constructor, it is
1976 * an error to have any other arguments."
1978 if ((matrix_parameters
> 0)
1979 && ((matrix_parameters
+ nonmatrix_parameters
) > 1)
1980 && constructor_type
->is_matrix()) {
1981 _mesa_glsl_error(& loc
, state
, "for matrix `%s' constructor, "
1982 "matrix must be only parameter",
1983 constructor_type
->name
);
1984 return ir_rvalue::error_value(ctx
);
1987 /* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
1989 * "In these cases, there must be enough components provided in the
1990 * arguments to provide an initializer for every component in the
1991 * constructed value."
1993 if (components_used
< type_components
&& components_used
!= 1
1994 && matrix_parameters
== 0) {
1995 _mesa_glsl_error(& loc
, state
, "too few components to construct "
1997 constructor_type
->name
);
1998 return ir_rvalue::error_value(ctx
);
2001 /* Matrices can never be consumed as is by any constructor but matrix
2002 * constructors. If the constructor type is not matrix, always break the
2003 * matrix up into a series of column vectors.
2005 if (!constructor_type
->is_matrix()) {
2006 foreach_in_list_safe(ir_rvalue
, matrix
, &actual_parameters
) {
2007 if (!matrix
->type
->is_matrix())
2010 /* Create a temporary containing the matrix. */
2011 ir_variable
*var
= new(ctx
) ir_variable(matrix
->type
, "matrix_tmp",
2013 instructions
->push_tail(var
);
2014 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
)
2015 ir_dereference_variable(var
), matrix
, NULL
));
2016 var
->constant_value
= matrix
->constant_expression_value();
2018 /* Replace the matrix with dereferences of its columns. */
2019 for (int i
= 0; i
< matrix
->type
->matrix_columns
; i
++) {
2020 matrix
->insert_before(new (ctx
) ir_dereference_array(var
,
2021 new(ctx
) ir_constant(i
)));
2027 bool all_parameters_are_constant
= true;
2029 /* Type cast each parameter and, if possible, fold constants.*/
2030 foreach_in_list_safe(ir_rvalue
, ir
, &actual_parameters
) {
2031 const glsl_type
*desired_type
=
2032 glsl_type::get_instance(constructor_type
->base_type
,
2033 ir
->type
->vector_elements
,
2034 ir
->type
->matrix_columns
);
2035 ir_rvalue
*result
= convert_component(ir
, desired_type
);
2037 /* Attempt to convert the parameter to a constant valued expression.
2038 * After doing so, track whether or not all the parameters to the
2039 * constructor are trivially constant valued expressions.
2041 ir_rvalue
*const constant
= result
->constant_expression_value();
2043 if (constant
!= NULL
)
2046 all_parameters_are_constant
= false;
2049 ir
->replace_with(result
);
2053 /* If all of the parameters are trivially constant, create a
2054 * constant representing the complete collection of parameters.
2056 if (all_parameters_are_constant
) {
2057 return new(ctx
) ir_constant(constructor_type
, &actual_parameters
);
2058 } else if (constructor_type
->is_scalar()) {
2059 return dereference_component((ir_rvalue
*) actual_parameters
.get_head_raw(),
2061 } else if (constructor_type
->is_vector()) {
2062 return emit_inline_vector_constructor(constructor_type
,
2067 assert(constructor_type
->is_matrix());
2068 return emit_inline_matrix_constructor(constructor_type
,
2073 } else if (subexpressions
[0]->oper
== ast_field_selection
) {
2074 return handle_method(instructions
, state
);
2076 const ast_expression
*id
= subexpressions
[0];
2077 const char *func_name
;
2078 YYLTYPE loc
= get_location();
2079 exec_list actual_parameters
;
2080 ir_variable
*sub_var
= NULL
;
2081 ir_rvalue
*array_idx
= NULL
;
2083 process_parameters(instructions
, &actual_parameters
, &this->expressions
,
2086 if (id
->oper
== ast_array_index
) {
2087 array_idx
= generate_array_index(ctx
, instructions
, state
, loc
,
2088 id
->subexpressions
[0],
2089 id
->subexpressions
[1], &func_name
,
2090 &actual_parameters
);
2092 func_name
= id
->primary_expression
.identifier
;
2095 /* an error was emitted earlier */
2097 return ir_rvalue::error_value(ctx
);
2099 ir_function_signature
*sig
=
2100 match_function_by_name(func_name
, &actual_parameters
, state
);
2102 ir_rvalue
*value
= NULL
;
2104 sig
= match_subroutine_by_name(func_name
, &actual_parameters
, state
, &sub_var
);
2108 no_matching_function_error(func_name
, &loc
, &actual_parameters
, state
);
2109 value
= ir_rvalue::error_value(ctx
);
2110 } else if (!verify_parameter_modes(state
, sig
, actual_parameters
, this->expressions
)) {
2111 /* an error has already been emitted */
2112 value
= ir_rvalue::error_value(ctx
);
2114 value
= generate_call(instructions
, sig
, &actual_parameters
, sub_var
, array_idx
, state
);
2116 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::void_type
,
2119 instructions
->push_tail(tmp
);
2120 value
= new(ctx
) ir_dereference_variable(tmp
);
2127 unreachable("not reached");
2131 ast_function_expression::has_sequence_subexpression() const
2133 foreach_list_typed(const ast_node
, ast
, link
, &this->expressions
) {
2134 if (ast
->has_sequence_subexpression())
2142 ast_aggregate_initializer::hir(exec_list
*instructions
,
2143 struct _mesa_glsl_parse_state
*state
)
2146 YYLTYPE loc
= this->get_location();
2148 if (!this->constructor_type
) {
2149 _mesa_glsl_error(&loc
, state
, "type of C-style initializer unknown");
2150 return ir_rvalue::error_value(ctx
);
2152 const glsl_type
*const constructor_type
= this->constructor_type
;
2154 if (!state
->has_420pack()) {
2155 _mesa_glsl_error(&loc
, state
, "C-style initialization requires the "
2156 "GL_ARB_shading_language_420pack extension");
2157 return ir_rvalue::error_value(ctx
);
2160 if (constructor_type
->is_array()) {
2161 return process_array_constructor(instructions
, constructor_type
, &loc
,
2162 &this->expressions
, state
);
2165 if (constructor_type
->is_record()) {
2166 return process_record_constructor(instructions
, constructor_type
, &loc
,
2167 &this->expressions
, state
);
2170 return process_vec_mat_constructor(instructions
, constructor_type
, &loc
,
2171 &this->expressions
, state
);