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 "main/core.h" /* for MAX2 */
26 #include "ir_visitor.h"
27 #include "glsl_types.h"
29 ir_rvalue::ir_rvalue()
31 this->type = glsl_type::error_type;
34 bool ir_rvalue::is_zero() const
39 bool ir_rvalue::is_one() const
44 bool ir_rvalue::is_negative_one() const
50 * Modify the swizzle make to move one component to another
52 * \param m IR swizzle to be modified
53 * \param from Component in the RHS that is to be swizzled
54 * \param to Desired swizzle location of \c from
57 update_rhs_swizzle(ir_swizzle_mask &m, unsigned from, unsigned to)
60 case 0: m.x = from; break;
61 case 1: m.y = from; break;
62 case 2: m.z = from; break;
63 case 3: m.w = from; break;
64 default: assert(!"Should not get here.");
67 m.num_components = MAX2(m.num_components, (to + 1));
71 ir_assignment::set_lhs(ir_rvalue *lhs)
74 bool swizzled = false;
77 ir_swizzle *swiz = lhs->as_swizzle();
82 unsigned write_mask = 0;
83 ir_swizzle_mask rhs_swiz = { 0, 0, 0, 0, 0, 0 };
85 for (unsigned i = 0; i < swiz->mask.num_components; i++) {
89 case 0: c = swiz->mask.x; break;
90 case 1: c = swiz->mask.y; break;
91 case 2: c = swiz->mask.z; break;
92 case 3: c = swiz->mask.w; break;
93 default: assert(!"Should not get here.");
96 write_mask |= (((this->write_mask >> i) & 1) << c);
97 update_rhs_swizzle(rhs_swiz, i, c);
100 this->write_mask = write_mask;
103 this->rhs = new(mem_ctx) ir_swizzle(this->rhs, rhs_swiz);
108 /* Now, RHS channels line up with the LHS writemask. Collapse it
109 * to just the channels that will be written.
111 ir_swizzle_mask rhs_swiz = { 0, 0, 0, 0, 0, 0 };
113 for (int i = 0; i < 4; i++) {
114 if (write_mask & (1 << i))
115 update_rhs_swizzle(rhs_swiz, i, rhs_chan++);
117 this->rhs = new(mem_ctx) ir_swizzle(this->rhs, rhs_swiz);
120 assert((lhs == NULL) || lhs->as_dereference());
122 this->lhs = (ir_dereference *) lhs;
126 ir_assignment::whole_variable_written()
128 ir_variable *v = this->lhs->whole_variable_referenced();
133 if (v->type->is_scalar())
136 if (v->type->is_vector()) {
137 const unsigned mask = (1U << v->type->vector_elements) - 1;
139 if (mask != this->write_mask)
143 /* Either all the vector components are assigned or the variable is some
144 * composite type (and the whole thing is assigned.
149 ir_assignment::ir_assignment(ir_dereference *lhs, ir_rvalue *rhs,
150 ir_rvalue *condition, unsigned write_mask)
152 this->ir_type = ir_type_assignment;
153 this->condition = condition;
156 this->write_mask = write_mask;
158 if (lhs->type->is_scalar() || lhs->type->is_vector()) {
159 int lhs_components = 0;
160 for (int i = 0; i < 4; i++) {
161 if (write_mask & (1 << i))
165 assert(lhs_components == this->rhs->type->vector_elements);
169 ir_assignment::ir_assignment(ir_rvalue *lhs, ir_rvalue *rhs,
170 ir_rvalue *condition)
172 this->ir_type = ir_type_assignment;
173 this->condition = condition;
176 /* If the RHS is a vector type, assume that all components of the vector
177 * type are being written to the LHS. The write mask comes from the RHS
178 * because we can have a case where the LHS is a vec4 and the RHS is a
179 * vec3. In that case, the assignment is:
181 * (assign (...) (xyz) (var_ref lhs) (var_ref rhs))
183 if (rhs->type->is_vector())
184 this->write_mask = (1U << rhs->type->vector_elements) - 1;
185 else if (rhs->type->is_scalar())
186 this->write_mask = 1;
188 this->write_mask = 0;
194 ir_expression::ir_expression(int op, const struct glsl_type *type,
197 assert(get_num_operands(ir_expression_operation(op)) == 1);
198 this->ir_type = ir_type_expression;
200 this->operation = ir_expression_operation(op);
201 this->operands[0] = op0;
202 this->operands[1] = NULL;
203 this->operands[2] = NULL;
204 this->operands[3] = NULL;
207 ir_expression::ir_expression(int op, const struct glsl_type *type,
208 ir_rvalue *op0, ir_rvalue *op1)
210 assert(((op1 == NULL) && (get_num_operands(ir_expression_operation(op)) == 1))
211 || (get_num_operands(ir_expression_operation(op)) == 2));
212 this->ir_type = ir_type_expression;
214 this->operation = ir_expression_operation(op);
215 this->operands[0] = op0;
216 this->operands[1] = op1;
217 this->operands[2] = NULL;
218 this->operands[3] = NULL;
221 ir_expression::ir_expression(int op, const struct glsl_type *type,
222 ir_rvalue *op0, ir_rvalue *op1,
223 ir_rvalue *op2, ir_rvalue *op3)
225 this->ir_type = ir_type_expression;
227 this->operation = ir_expression_operation(op);
228 this->operands[0] = op0;
229 this->operands[1] = op1;
230 this->operands[2] = op2;
231 this->operands[3] = op3;
234 ir_expression::ir_expression(int op, ir_rvalue *op0)
236 this->ir_type = ir_type_expression;
238 this->operation = ir_expression_operation(op);
239 this->operands[0] = op0;
240 this->operands[1] = NULL;
241 this->operands[2] = NULL;
242 this->operands[3] = NULL;
244 assert(op <= ir_last_unop);
246 switch (this->operation) {
247 case ir_unop_bit_not:
248 case ir_unop_logic_not:
263 case ir_unop_round_even:
266 case ir_unop_sin_reduced:
267 case ir_unop_cos_reduced:
270 this->type = op0->type;
276 this->type = glsl_type::get_instance(GLSL_TYPE_INT,
277 op0->type->vector_elements, 1);
283 this->type = glsl_type::get_instance(GLSL_TYPE_FLOAT,
284 op0->type->vector_elements, 1);
289 this->type = glsl_type::get_instance(GLSL_TYPE_BOOL,
290 op0->type->vector_elements, 1);
294 this->type = glsl_type::get_instance(GLSL_TYPE_UINT,
295 op0->type->vector_elements, 1);
299 this->type = glsl_type::float_type;
303 this->type = glsl_type::bool_type;
307 assert(!"not reached: missing automatic type setup for ir_expression");
308 this->type = op0->type;
313 ir_expression::ir_expression(int op, ir_rvalue *op0, ir_rvalue *op1)
315 this->ir_type = ir_type_expression;
317 this->operation = ir_expression_operation(op);
318 this->operands[0] = op0;
319 this->operands[1] = op1;
320 this->operands[2] = NULL;
321 this->operands[3] = NULL;
323 assert(op > ir_last_unop);
325 switch (this->operation) {
326 case ir_binop_all_equal:
327 case ir_binop_any_nequal:
328 this->type = glsl_type::bool_type;
339 if (op0->type->is_scalar()) {
340 this->type = op1->type;
341 } else if (op1->type->is_scalar()) {
342 this->type = op0->type;
344 /* FINISHME: matrix types */
345 assert(!op0->type->is_matrix() && !op1->type->is_matrix());
346 assert(op0->type == op1->type);
347 this->type = op0->type;
351 case ir_binop_logic_and:
352 case ir_binop_logic_xor:
353 case ir_binop_logic_or:
354 case ir_binop_bit_and:
355 case ir_binop_bit_xor:
356 case ir_binop_bit_or:
357 if (op0->type->is_scalar()) {
358 this->type = op1->type;
359 } else if (op1->type->is_scalar()) {
360 this->type = op0->type;
365 case ir_binop_nequal:
366 case ir_binop_lequal:
367 case ir_binop_gequal:
369 case ir_binop_greater:
370 assert(op0->type == op1->type);
371 this->type = glsl_type::get_instance(GLSL_TYPE_BOOL,
372 op0->type->vector_elements, 1);
376 this->type = glsl_type::float_type;
379 case ir_binop_lshift:
380 case ir_binop_rshift:
381 this->type = op0->type;
385 assert(!"not reached: missing automatic type setup for ir_expression");
386 this->type = glsl_type::float_type;
391 ir_expression::get_num_operands(ir_expression_operation op)
393 assert(op <= ir_last_opcode);
395 if (op <= ir_last_unop)
398 if (op <= ir_last_binop)
401 if (op == ir_quadop_vector)
408 static const char *const operator_strs[] = {
471 const char *ir_expression::operator_string(ir_expression_operation op)
473 assert((unsigned int) op < Elements(operator_strs));
474 assert(Elements(operator_strs) == (ir_quadop_vector + 1));
475 return operator_strs[op];
478 const char *ir_expression::operator_string()
480 return operator_string(this->operation);
484 depth_layout_string(ir_depth_layout layout)
487 case ir_depth_layout_none: return "";
488 case ir_depth_layout_any: return "depth_any";
489 case ir_depth_layout_greater: return "depth_greater";
490 case ir_depth_layout_less: return "depth_less";
491 case ir_depth_layout_unchanged: return "depth_unchanged";
499 ir_expression_operation
500 ir_expression::get_operator(const char *str)
502 const int operator_count = sizeof(operator_strs) / sizeof(operator_strs[0]);
503 for (int op = 0; op < operator_count; op++) {
504 if (strcmp(str, operator_strs[op]) == 0)
505 return (ir_expression_operation) op;
507 return (ir_expression_operation) -1;
510 ir_constant::ir_constant()
512 this->ir_type = ir_type_constant;
515 ir_constant::ir_constant(const struct glsl_type *type,
516 const ir_constant_data *data)
518 assert((type->base_type >= GLSL_TYPE_UINT)
519 && (type->base_type <= GLSL_TYPE_BOOL));
521 this->ir_type = ir_type_constant;
523 memcpy(& this->value, data, sizeof(this->value));
526 ir_constant::ir_constant(float f)
528 this->ir_type = ir_type_constant;
529 this->type = glsl_type::float_type;
530 this->value.f[0] = f;
531 for (int i = 1; i < 16; i++) {
532 this->value.f[i] = 0;
536 ir_constant::ir_constant(unsigned int u)
538 this->ir_type = ir_type_constant;
539 this->type = glsl_type::uint_type;
540 this->value.u[0] = u;
541 for (int i = 1; i < 16; i++) {
542 this->value.u[i] = 0;
546 ir_constant::ir_constant(int i)
548 this->ir_type = ir_type_constant;
549 this->type = glsl_type::int_type;
550 this->value.i[0] = i;
551 for (int i = 1; i < 16; i++) {
552 this->value.i[i] = 0;
556 ir_constant::ir_constant(bool b)
558 this->ir_type = ir_type_constant;
559 this->type = glsl_type::bool_type;
560 this->value.b[0] = b;
561 for (int i = 1; i < 16; i++) {
562 this->value.b[i] = false;
566 ir_constant::ir_constant(const ir_constant *c, unsigned i)
568 this->ir_type = ir_type_constant;
569 this->type = c->type->get_base_type();
571 switch (this->type->base_type) {
572 case GLSL_TYPE_UINT: this->value.u[0] = c->value.u[i]; break;
573 case GLSL_TYPE_INT: this->value.i[0] = c->value.i[i]; break;
574 case GLSL_TYPE_FLOAT: this->value.f[0] = c->value.f[i]; break;
575 case GLSL_TYPE_BOOL: this->value.b[0] = c->value.b[i]; break;
576 default: assert(!"Should not get here."); break;
580 ir_constant::ir_constant(const struct glsl_type *type, exec_list *value_list)
582 this->ir_type = ir_type_constant;
585 assert(type->is_scalar() || type->is_vector() || type->is_matrix()
586 || type->is_record() || type->is_array());
588 if (type->is_array()) {
589 this->array_elements = ralloc_array(this, ir_constant *, type->length);
591 foreach_list(node, value_list) {
592 ir_constant *value = (ir_constant *) node;
593 assert(value->as_constant() != NULL);
595 this->array_elements[i++] = value;
600 /* If the constant is a record, the types of each of the entries in
601 * value_list must be a 1-for-1 match with the structure components. Each
602 * entry must also be a constant. Just move the nodes from the value_list
603 * to the list in the ir_constant.
605 /* FINISHME: Should there be some type checking and / or assertions here? */
606 /* FINISHME: Should the new constant take ownership of the nodes from
607 * FINISHME: value_list, or should it make copies?
609 if (type->is_record()) {
610 value_list->move_nodes_to(& this->components);
614 for (unsigned i = 0; i < 16; i++) {
615 this->value.u[i] = 0;
618 ir_constant *value = (ir_constant *) (value_list->head);
620 /* Constructors with exactly one scalar argument are special for vectors
621 * and matrices. For vectors, the scalar value is replicated to fill all
622 * the components. For matrices, the scalar fills the components of the
623 * diagonal while the rest is filled with 0.
625 if (value->type->is_scalar() && value->next->is_tail_sentinel()) {
626 if (type->is_matrix()) {
627 /* Matrix - fill diagonal (rest is already set to 0) */
628 assert(type->base_type == GLSL_TYPE_FLOAT);
629 for (unsigned i = 0; i < type->matrix_columns; i++)
630 this->value.f[i * type->vector_elements + i] = value->value.f[0];
632 /* Vector or scalar - fill all components */
633 switch (type->base_type) {
636 for (unsigned i = 0; i < type->components(); i++)
637 this->value.u[i] = value->value.u[0];
639 case GLSL_TYPE_FLOAT:
640 for (unsigned i = 0; i < type->components(); i++)
641 this->value.f[i] = value->value.f[0];
644 for (unsigned i = 0; i < type->components(); i++)
645 this->value.b[i] = value->value.b[0];
648 assert(!"Should not get here.");
655 if (type->is_matrix() && value->type->is_matrix()) {
656 assert(value->next->is_tail_sentinel());
658 /* From section 5.4.2 of the GLSL 1.20 spec:
659 * "If a matrix is constructed from a matrix, then each component
660 * (column i, row j) in the result that has a corresponding component
661 * (column i, row j) in the argument will be initialized from there."
663 unsigned cols = MIN2(type->matrix_columns, value->type->matrix_columns);
664 unsigned rows = MIN2(type->vector_elements, value->type->vector_elements);
665 for (unsigned i = 0; i < cols; i++) {
666 for (unsigned j = 0; j < rows; j++) {
667 const unsigned src = i * value->type->vector_elements + j;
668 const unsigned dst = i * type->vector_elements + j;
669 this->value.f[dst] = value->value.f[src];
673 /* "All other components will be initialized to the identity matrix." */
674 for (unsigned i = cols; i < type->matrix_columns; i++)
675 this->value.f[i * type->vector_elements + i] = 1.0;
680 /* Use each component from each entry in the value_list to initialize one
681 * component of the constant being constructed.
683 for (unsigned i = 0; i < type->components(); /* empty */) {
684 assert(value->as_constant() != NULL);
685 assert(!value->is_tail_sentinel());
687 for (unsigned j = 0; j < value->type->components(); j++) {
688 switch (type->base_type) {
690 this->value.u[i] = value->get_uint_component(j);
693 this->value.i[i] = value->get_int_component(j);
695 case GLSL_TYPE_FLOAT:
696 this->value.f[i] = value->get_float_component(j);
699 this->value.b[i] = value->get_bool_component(j);
702 /* FINISHME: What to do? Exceptions are not the answer.
708 if (i >= type->components())
712 value = (ir_constant *) value->next;
717 ir_constant::zero(void *mem_ctx, const glsl_type *type)
719 assert(type->is_numeric() || type->is_boolean());
721 ir_constant *c = new(mem_ctx) ir_constant;
723 memset(&c->value, 0, sizeof(c->value));
729 ir_constant::get_bool_component(unsigned i) const
731 switch (this->type->base_type) {
732 case GLSL_TYPE_UINT: return this->value.u[i] != 0;
733 case GLSL_TYPE_INT: return this->value.i[i] != 0;
734 case GLSL_TYPE_FLOAT: return ((int)this->value.f[i]) != 0;
735 case GLSL_TYPE_BOOL: return this->value.b[i];
736 default: assert(!"Should not get here."); break;
739 /* Must return something to make the compiler happy. This is clearly an
746 ir_constant::get_float_component(unsigned i) const
748 switch (this->type->base_type) {
749 case GLSL_TYPE_UINT: return (float) this->value.u[i];
750 case GLSL_TYPE_INT: return (float) this->value.i[i];
751 case GLSL_TYPE_FLOAT: return this->value.f[i];
752 case GLSL_TYPE_BOOL: return this->value.b[i] ? 1.0 : 0.0;
753 default: assert(!"Should not get here."); break;
756 /* Must return something to make the compiler happy. This is clearly an
763 ir_constant::get_int_component(unsigned i) const
765 switch (this->type->base_type) {
766 case GLSL_TYPE_UINT: return this->value.u[i];
767 case GLSL_TYPE_INT: return this->value.i[i];
768 case GLSL_TYPE_FLOAT: return (int) this->value.f[i];
769 case GLSL_TYPE_BOOL: return this->value.b[i] ? 1 : 0;
770 default: assert(!"Should not get here."); break;
773 /* Must return something to make the compiler happy. This is clearly an
780 ir_constant::get_uint_component(unsigned i) const
782 switch (this->type->base_type) {
783 case GLSL_TYPE_UINT: return this->value.u[i];
784 case GLSL_TYPE_INT: return this->value.i[i];
785 case GLSL_TYPE_FLOAT: return (unsigned) this->value.f[i];
786 case GLSL_TYPE_BOOL: return this->value.b[i] ? 1 : 0;
787 default: assert(!"Should not get here."); break;
790 /* Must return something to make the compiler happy. This is clearly an
797 ir_constant::get_array_element(unsigned i) const
799 assert(this->type->is_array());
801 /* From page 35 (page 41 of the PDF) of the GLSL 1.20 spec:
803 * "Behavior is undefined if a shader subscripts an array with an index
804 * less than 0 or greater than or equal to the size the array was
807 * Most out-of-bounds accesses are removed before things could get this far.
808 * There are cases where non-constant array index values can get constant
813 else if (i >= this->type->length)
814 i = this->type->length - 1;
816 return array_elements[i];
820 ir_constant::get_record_field(const char *name)
822 int idx = this->type->field_index(name);
827 if (this->components.is_empty())
830 exec_node *node = this->components.head;
831 for (int i = 0; i < idx; i++) {
834 /* If the end of the list is encountered before the element matching the
835 * requested field is found, return NULL.
837 if (node->is_tail_sentinel())
841 return (ir_constant *) node;
846 ir_constant::has_value(const ir_constant *c) const
848 if (this->type != c->type)
851 if (this->type->is_array()) {
852 for (unsigned i = 0; i < this->type->length; i++) {
853 if (!this->array_elements[i]->has_value(c->array_elements[i]))
859 if (this->type->base_type == GLSL_TYPE_STRUCT) {
860 const exec_node *a_node = this->components.head;
861 const exec_node *b_node = c->components.head;
863 while (!a_node->is_tail_sentinel()) {
864 assert(!b_node->is_tail_sentinel());
866 const ir_constant *const a_field = (ir_constant *) a_node;
867 const ir_constant *const b_field = (ir_constant *) b_node;
869 if (!a_field->has_value(b_field))
872 a_node = a_node->next;
873 b_node = b_node->next;
879 for (unsigned i = 0; i < this->type->components(); i++) {
880 switch (this->type->base_type) {
882 if (this->value.u[i] != c->value.u[i])
886 if (this->value.i[i] != c->value.i[i])
889 case GLSL_TYPE_FLOAT:
890 if (this->value.f[i] != c->value.f[i])
894 if (this->value.b[i] != c->value.b[i])
898 assert(!"Should not get here.");
907 ir_constant::is_zero() const
909 if (!this->type->is_scalar() && !this->type->is_vector())
912 for (unsigned c = 0; c < this->type->vector_elements; c++) {
913 switch (this->type->base_type) {
914 case GLSL_TYPE_FLOAT:
915 if (this->value.f[c] != 0.0)
919 if (this->value.i[c] != 0)
923 if (this->value.u[c] != 0)
927 if (this->value.b[c] != false)
931 /* The only other base types are structures, arrays, and samplers.
932 * Samplers cannot be constants, and the others should have been
933 * filtered out above.
935 assert(!"Should not get here.");
944 ir_constant::is_one() const
946 if (!this->type->is_scalar() && !this->type->is_vector())
949 for (unsigned c = 0; c < this->type->vector_elements; c++) {
950 switch (this->type->base_type) {
951 case GLSL_TYPE_FLOAT:
952 if (this->value.f[c] != 1.0)
956 if (this->value.i[c] != 1)
960 if (this->value.u[c] != 1)
964 if (this->value.b[c] != true)
968 /* The only other base types are structures, arrays, and samplers.
969 * Samplers cannot be constants, and the others should have been
970 * filtered out above.
972 assert(!"Should not get here.");
981 ir_constant::is_negative_one() const
983 if (!this->type->is_scalar() && !this->type->is_vector())
986 if (this->type->is_boolean())
989 for (unsigned c = 0; c < this->type->vector_elements; c++) {
990 switch (this->type->base_type) {
991 case GLSL_TYPE_FLOAT:
992 if (this->value.f[c] != -1.0)
996 if (this->value.i[c] != -1)
1000 if (int(this->value.u[c]) != -1)
1004 /* The only other base types are structures, arrays, samplers, and
1005 * booleans. Samplers cannot be constants, and the others should
1006 * have been filtered out above.
1008 assert(!"Should not get here.");
1018 this->ir_type = ir_type_loop;
1019 this->cmp = ir_unop_neg;
1022 this->increment = NULL;
1023 this->counter = NULL;
1027 ir_dereference_variable::ir_dereference_variable(ir_variable *var)
1029 this->ir_type = ir_type_dereference_variable;
1031 this->type = (var != NULL) ? var->type : glsl_type::error_type;
1035 ir_dereference_array::ir_dereference_array(ir_rvalue *value,
1036 ir_rvalue *array_index)
1038 this->ir_type = ir_type_dereference_array;
1039 this->array_index = array_index;
1040 this->set_array(value);
1044 ir_dereference_array::ir_dereference_array(ir_variable *var,
1045 ir_rvalue *array_index)
1047 void *ctx = ralloc_parent(var);
1049 this->ir_type = ir_type_dereference_array;
1050 this->array_index = array_index;
1051 this->set_array(new(ctx) ir_dereference_variable(var));
1056 ir_dereference_array::set_array(ir_rvalue *value)
1058 this->array = value;
1059 this->type = glsl_type::error_type;
1061 if (this->array != NULL) {
1062 const glsl_type *const vt = this->array->type;
1064 if (vt->is_array()) {
1065 type = vt->element_type();
1066 } else if (vt->is_matrix()) {
1067 type = vt->column_type();
1068 } else if (vt->is_vector()) {
1069 type = vt->get_base_type();
1075 ir_dereference_record::ir_dereference_record(ir_rvalue *value,
1078 this->ir_type = ir_type_dereference_record;
1079 this->record = value;
1080 this->field = ralloc_strdup(this, field);
1081 this->type = (this->record != NULL)
1082 ? this->record->type->field_type(field) : glsl_type::error_type;
1086 ir_dereference_record::ir_dereference_record(ir_variable *var,
1089 void *ctx = ralloc_parent(var);
1091 this->ir_type = ir_type_dereference_record;
1092 this->record = new(ctx) ir_dereference_variable(var);
1093 this->field = ralloc_strdup(this, field);
1094 this->type = (this->record != NULL)
1095 ? this->record->type->field_type(field) : glsl_type::error_type;
1099 ir_dereference::is_lvalue() const
1101 ir_variable *var = this->variable_referenced();
1103 /* Every l-value derference chain eventually ends in a variable.
1105 if ((var == NULL) || var->read_only)
1108 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
1110 * "Samplers cannot be treated as l-values; hence cannot be used
1111 * as out or inout function parameters, nor can they be
1114 if (this->type->contains_sampler())
1121 const char *tex_opcode_strs[] = { "tex", "txb", "txl", "txd", "txf", "txs" };
1123 const char *ir_texture::opcode_string()
1125 assert((unsigned int) op <=
1126 sizeof(tex_opcode_strs) / sizeof(tex_opcode_strs[0]));
1127 return tex_opcode_strs[op];
1131 ir_texture::get_opcode(const char *str)
1133 const int count = sizeof(tex_opcode_strs) / sizeof(tex_opcode_strs[0]);
1134 for (int op = 0; op < count; op++) {
1135 if (strcmp(str, tex_opcode_strs[op]) == 0)
1136 return (ir_texture_opcode) op;
1138 return (ir_texture_opcode) -1;
1143 ir_texture::set_sampler(ir_dereference *sampler, const glsl_type *type)
1145 assert(sampler != NULL);
1146 assert(type != NULL);
1147 this->sampler = sampler;
1150 if (this->op == ir_txs) {
1151 assert(type->base_type == GLSL_TYPE_INT);
1153 assert(sampler->type->sampler_type == (int) type->base_type);
1154 if (sampler->type->sampler_shadow)
1155 assert(type->vector_elements == 4 || type->vector_elements == 1);
1157 assert(type->vector_elements == 4);
1163 ir_swizzle::init_mask(const unsigned *comp, unsigned count)
1165 assert((count >= 1) && (count <= 4));
1167 memset(&this->mask, 0, sizeof(this->mask));
1168 this->mask.num_components = count;
1170 unsigned dup_mask = 0;
1173 assert(comp[3] <= 3);
1174 dup_mask |= (1U << comp[3])
1175 & ((1U << comp[0]) | (1U << comp[1]) | (1U << comp[2]));
1176 this->mask.w = comp[3];
1179 assert(comp[2] <= 3);
1180 dup_mask |= (1U << comp[2])
1181 & ((1U << comp[0]) | (1U << comp[1]));
1182 this->mask.z = comp[2];
1185 assert(comp[1] <= 3);
1186 dup_mask |= (1U << comp[1])
1187 & ((1U << comp[0]));
1188 this->mask.y = comp[1];
1191 assert(comp[0] <= 3);
1192 this->mask.x = comp[0];
1195 this->mask.has_duplicates = dup_mask != 0;
1197 /* Based on the number of elements in the swizzle and the base type
1198 * (i.e., float, int, unsigned, or bool) of the vector being swizzled,
1199 * generate the type of the resulting value.
1201 type = glsl_type::get_instance(val->type->base_type, mask.num_components, 1);
1204 ir_swizzle::ir_swizzle(ir_rvalue *val, unsigned x, unsigned y, unsigned z,
1205 unsigned w, unsigned count)
1208 const unsigned components[4] = { x, y, z, w };
1209 this->ir_type = ir_type_swizzle;
1210 this->init_mask(components, count);
1213 ir_swizzle::ir_swizzle(ir_rvalue *val, const unsigned *comp,
1217 this->ir_type = ir_type_swizzle;
1218 this->init_mask(comp, count);
1221 ir_swizzle::ir_swizzle(ir_rvalue *val, ir_swizzle_mask mask)
1223 this->ir_type = ir_type_swizzle;
1226 this->type = glsl_type::get_instance(val->type->base_type,
1227 mask.num_components, 1);
1236 ir_swizzle::create(ir_rvalue *val, const char *str, unsigned vector_length)
1238 void *ctx = ralloc_parent(val);
1240 /* For each possible swizzle character, this table encodes the value in
1241 * \c idx_map that represents the 0th element of the vector. For invalid
1242 * swizzle characters (e.g., 'k'), a special value is used that will allow
1243 * detection of errors.
1245 static const unsigned char base_idx[26] = {
1246 /* a b c d e f g h i j k l m */
1247 R, R, I, I, I, I, R, I, I, I, I, I, I,
1248 /* n o p q r s t u v w x y z */
1249 I, I, S, S, R, S, S, I, I, X, X, X, X
1252 /* Each valid swizzle character has an entry in the previous table. This
1253 * table encodes the base index encoded in the previous table plus the actual
1254 * index of the swizzle character. When processing swizzles, the first
1255 * character in the string is indexed in the previous table. Each character
1256 * in the string is indexed in this table, and the value found there has the
1257 * value form the first table subtracted. The result must be on the range
1260 * For example, the string "wzyx" will get X from the first table. Each of
1261 * the charcaters will get X+3, X+2, X+1, and X+0 from this table. After
1262 * subtraction, the swizzle values are { 3, 2, 1, 0 }.
1264 * The string "wzrg" will get X from the first table. Each of the characters
1265 * will get X+3, X+2, R+0, and R+1 from this table. After subtraction, the
1266 * swizzle values are { 3, 2, 4, 5 }. Since 4 and 5 are outside the range
1267 * [0,3], the error is detected.
1269 static const unsigned char idx_map[26] = {
1270 /* a b c d e f g h i j k l m */
1271 R+3, R+2, 0, 0, 0, 0, R+1, 0, 0, 0, 0, 0, 0,
1272 /* n o p q r s t u v w x y z */
1273 0, 0, S+2, S+3, R+0, S+0, S+1, 0, 0, X+3, X+0, X+1, X+2
1276 int swiz_idx[4] = { 0, 0, 0, 0 };
1280 /* Validate the first character in the swizzle string and look up the base
1281 * index value as described above.
1283 if ((str[0] < 'a') || (str[0] > 'z'))
1286 const unsigned base = base_idx[str[0] - 'a'];
1289 for (i = 0; (i < 4) && (str[i] != '\0'); i++) {
1290 /* Validate the next character, and, as described above, convert it to a
1293 if ((str[i] < 'a') || (str[i] > 'z'))
1296 swiz_idx[i] = idx_map[str[i] - 'a'] - base;
1297 if ((swiz_idx[i] < 0) || (swiz_idx[i] >= (int) vector_length))
1304 return new(ctx) ir_swizzle(val, swiz_idx[0], swiz_idx[1], swiz_idx[2],
1314 ir_swizzle::variable_referenced() const
1316 return this->val->variable_referenced();
1320 ir_variable::ir_variable(const struct glsl_type *type, const char *name,
1321 ir_variable_mode mode)
1322 : max_array_access(0), read_only(false), centroid(false), invariant(false),
1323 mode(mode), interpolation(ir_var_smooth)
1325 this->ir_type = ir_type_variable;
1327 this->name = ralloc_strdup(this, name);
1328 this->explicit_location = false;
1329 this->location = -1;
1330 this->warn_extension = NULL;
1331 this->constant_value = NULL;
1332 this->origin_upper_left = false;
1333 this->pixel_center_integer = false;
1334 this->depth_layout = ir_depth_layout_none;
1337 if (type && type->base_type == GLSL_TYPE_SAMPLER)
1338 this->read_only = true;
1343 ir_variable::interpolation_string() const
1345 switch (this->interpolation) {
1346 case ir_var_smooth: return "smooth";
1347 case ir_var_flat: return "flat";
1348 case ir_var_noperspective: return "noperspective";
1351 assert(!"Should not get here.");
1356 ir_function_signature::ir_function_signature(const glsl_type *return_type)
1357 : return_type(return_type), is_defined(false), _function(NULL)
1359 this->ir_type = ir_type_function_signature;
1360 this->is_builtin = false;
1365 modes_match(unsigned a, unsigned b)
1370 /* Accept "in" vs. "const in" */
1371 if ((a == ir_var_const_in && b == ir_var_in) ||
1372 (b == ir_var_const_in && a == ir_var_in))
1380 ir_function_signature::qualifiers_match(exec_list *params)
1382 exec_list_iterator iter_a = parameters.iterator();
1383 exec_list_iterator iter_b = params->iterator();
1385 /* check that the qualifiers match. */
1386 while (iter_a.has_next()) {
1387 ir_variable *a = (ir_variable *)iter_a.get();
1388 ir_variable *b = (ir_variable *)iter_b.get();
1390 if (a->read_only != b->read_only ||
1391 !modes_match(a->mode, b->mode) ||
1392 a->interpolation != b->interpolation ||
1393 a->centroid != b->centroid) {
1395 /* parameter a's qualifiers don't match */
1407 ir_function_signature::replace_parameters(exec_list *new_params)
1409 /* Destroy all of the previous parameter information. If the previous
1410 * parameter information comes from the function prototype, it may either
1411 * specify incorrect parameter names or not have names at all.
1413 foreach_iter(exec_list_iterator, iter, parameters) {
1414 assert(((ir_instruction *) iter.get())->as_variable() != NULL);
1419 new_params->move_nodes_to(¶meters);
1423 ir_function::ir_function(const char *name)
1425 this->ir_type = ir_type_function;
1426 this->name = ralloc_strdup(this, name);
1431 ir_function::has_user_signature()
1433 foreach_list(n, &this->signatures) {
1434 ir_function_signature *const sig = (ir_function_signature *) n;
1435 if (!sig->is_builtin)
1443 ir_call::get_error_instruction(void *ctx)
1445 ir_call *call = new(ctx) ir_call;
1447 call->type = glsl_type::error_type;
1452 ir_call::set_callee(ir_function_signature *sig)
1454 assert((this->type == NULL) || (this->type == sig->return_type));
1460 visit_exec_list(exec_list *list, ir_visitor *visitor)
1462 foreach_iter(exec_list_iterator, iter, *list) {
1463 ((ir_instruction *)iter.get())->accept(visitor);
1469 steal_memory(ir_instruction *ir, void *new_ctx)
1471 ir_variable *var = ir->as_variable();
1472 ir_constant *constant = ir->as_constant();
1473 if (var != NULL && var->constant_value != NULL)
1474 steal_memory(var->constant_value, ir);
1476 /* The components of aggregate constants are not visited by the normal
1477 * visitor, so steal their values by hand.
1479 if (constant != NULL) {
1480 if (constant->type->is_record()) {
1481 foreach_iter(exec_list_iterator, iter, constant->components) {
1482 ir_constant *field = (ir_constant *)iter.get();
1483 steal_memory(field, ir);
1485 } else if (constant->type->is_array()) {
1486 for (unsigned int i = 0; i < constant->type->length; i++) {
1487 steal_memory(constant->array_elements[i], ir);
1492 ralloc_steal(new_ctx, ir);
1497 reparent_ir(exec_list *list, void *mem_ctx)
1499 foreach_list(node, list) {
1500 visit_tree((ir_instruction *) node, steal_memory, mem_ctx);
1506 try_min_one(ir_rvalue *ir)
1508 ir_expression *expr = ir->as_expression();
1510 if (!expr || expr->operation != ir_binop_min)
1513 if (expr->operands[0]->is_one())
1514 return expr->operands[1];
1516 if (expr->operands[1]->is_one())
1517 return expr->operands[0];
1523 try_max_zero(ir_rvalue *ir)
1525 ir_expression *expr = ir->as_expression();
1527 if (!expr || expr->operation != ir_binop_max)
1530 if (expr->operands[0]->is_zero())
1531 return expr->operands[1];
1533 if (expr->operands[1]->is_zero())
1534 return expr->operands[0];
1540 ir_rvalue::as_rvalue_to_saturate()
1542 ir_expression *expr = this->as_expression();
1547 ir_rvalue *max_zero = try_max_zero(expr);
1549 return try_min_one(max_zero);
1551 ir_rvalue *min_one = try_min_one(expr);
1553 return try_max_zero(min_one);