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* Copyright (c) 2013 Intel Corporation
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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* \file lower_named_interface_blocks.cpp
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* This lowering pass converts all interface blocks with instance names
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* into interface blocks without an instance name.
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* For example, the following shader:
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* inst_name.block_var = 0.0;
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* This takes place after the shader code has already been verified with
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* the interface name in place.
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* The linking phase will use the interface block name rather than the
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* interface's instance name when linking interfaces.
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* This modification to the ir allows our currently existing dead code
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* elimination to work with interface blocks without changes.
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#include "glsl_symbol_table.h"
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#include "ir_optimization.h"
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#include "ir_rvalue_visitor.h"
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#include "util/hash_table.h"
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#include "main/shader_types.h"
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static const glsl_type *
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process_array_type(const glsl_type *type, unsigned idx)
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const glsl_type *element_type = type->fields.array;
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if (element_type->is_array()) {
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const glsl_type *new_array_type = process_array_type(element_type, idx);
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return glsl_type::get_array_instance(new_array_type, type->length);
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return glsl_type::get_array_instance(
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element_type->fields.structure[idx].type, type->length);
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process_array_ir(void * const mem_ctx,
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ir_dereference_array *deref_array_prev,
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ir_dereference_array *deref_array =
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deref_array_prev->array->as_dereference_array();
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if (deref_array == NULL) {
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return new(mem_ctx) ir_dereference_array(deref_var,
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deref_array_prev->array_index);
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deref_array = (ir_dereference_array *) process_array_ir(mem_ctx,
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return new(mem_ctx) ir_dereference_array(deref_array,
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deref_array_prev->array_index);
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class flatten_named_interface_blocks_declarations : public ir_rvalue_visitor
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void * const mem_ctx;
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hash_table *interface_namespace;
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flatten_named_interface_blocks_declarations(void *mem_ctx)
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interface_namespace(NULL)
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void run(exec_list *instructions);
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virtual ir_visitor_status visit_leave(ir_assignment *);
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virtual ir_visitor_status visit_leave(ir_expression *);
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virtual void handle_rvalue(ir_rvalue **rvalue);
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} /* anonymous namespace */
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flatten_named_interface_blocks_declarations::run(exec_list *instructions)
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interface_namespace = _mesa_hash_table_create(NULL, _mesa_hash_string,
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_mesa_key_string_equal);
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/* First pass: adjust instance block variables with an instance name
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* to not have an instance name.
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* The interface block variables are stored in the interface_namespace
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* hash table so they can be used in the second pass.
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foreach_in_list_safe(ir_instruction, node, instructions) {
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ir_variable *var = node->as_variable();
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if (!var || !var->is_interface_instance())
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/* It should be possible to handle uniforms during this pass,
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* but, this will require changes to the other uniform block
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if (var->data.mode == ir_var_uniform ||
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var->data.mode == ir_var_shader_storage)
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const glsl_type * iface_t = var->type->without_array();
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exec_node *insert_pos = var;
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assert (iface_t->is_interface());
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for (unsigned i = 0; i < iface_t->length; i++) {
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const char * field_name = iface_t->fields.structure[i].name;
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char *iface_field_name =
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ralloc_asprintf(mem_ctx, "%s %s.%s.%s",
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var->data.mode == ir_var_shader_in ? "in" : "out",
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iface_t->name, var->name, field_name);
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hash_entry *entry = _mesa_hash_table_search(interface_namespace,
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ir_variable *found_var = entry ? (ir_variable *) entry->data : NULL;
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ir_variable *new_var;
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ralloc_strdup(mem_ctx, iface_t->fields.structure[i].name);
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if (!var->type->is_array()) {
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new(mem_ctx) ir_variable(iface_t->fields.structure[i].type,
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(ir_variable_mode) var->data.mode);
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const glsl_type *new_array_type =
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process_array_type(var->type, i);
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new(mem_ctx) ir_variable(new_array_type,
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(ir_variable_mode) var->data.mode);
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new_var->data.location = iface_t->fields.structure[i].location;
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new_var->data.location_frac =
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iface_t->fields.structure[i].component >= 0 ?
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iface_t->fields.structure[i].component : 0;
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new_var->data.explicit_location = (new_var->data.location >= 0);
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new_var->data.explicit_component =
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(iface_t->fields.structure[i].component >= 0);
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new_var->data.offset = iface_t->fields.structure[i].offset;
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new_var->data.explicit_xfb_offset =
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(iface_t->fields.structure[i].offset >= 0);
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new_var->data.xfb_buffer =
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iface_t->fields.structure[i].xfb_buffer;
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new_var->data.explicit_xfb_buffer =
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iface_t->fields.structure[i].explicit_xfb_buffer;
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new_var->data.interpolation =
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iface_t->fields.structure[i].interpolation;
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new_var->data.centroid = iface_t->fields.structure[i].centroid;
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new_var->data.sample = iface_t->fields.structure[i].sample;
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new_var->data.patch = iface_t->fields.structure[i].patch;
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new_var->data.stream = var->data.stream;
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new_var->data.how_declared = var->data.how_declared;
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new_var->data.from_named_ifc_block = 1;
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new_var->init_interface_type(var->type);
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_mesa_hash_table_insert(interface_namespace, iface_field_name,
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insert_pos->insert_after(new_var);
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insert_pos = new_var;
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/* Second pass: visit all ir_dereference_record instances, and if they
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* reference an interface block, then flatten the refererence out.
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visit_list_elements(this, instructions);
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_mesa_hash_table_destroy(interface_namespace, NULL);
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interface_namespace = NULL;
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flatten_named_interface_blocks_declarations::visit_leave(ir_assignment *ir)
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ir_dereference_record *lhs_rec = ir->lhs->as_dereference_record();
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ir_variable *lhs_var = ir->lhs->variable_referenced();
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if (lhs_var && lhs_var->get_interface_type()) {
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lhs_var->data.assigned = 1;
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ir_rvalue *lhs_rec_tmp = lhs_rec;
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handle_rvalue(&lhs_rec_tmp);
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if (lhs_rec_tmp != lhs_rec) {
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ir->set_lhs(lhs_rec_tmp);
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ir_variable *lhs_var = lhs_rec_tmp->variable_referenced();
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lhs_var->data.assigned = 1;
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return rvalue_visit(ir);
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flatten_named_interface_blocks_declarations::visit_leave(ir_expression *ir)
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ir_visitor_status status = rvalue_visit(ir);
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if (ir->operation == ir_unop_interpolate_at_centroid ||
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ir->operation == ir_binop_interpolate_at_offset ||
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ir->operation == ir_binop_interpolate_at_sample) {
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const ir_rvalue *val = ir->operands[0];
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/* This disables varying packing for this input. */
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val->variable_referenced()->data.must_be_shader_input = 1;
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flatten_named_interface_blocks_declarations::handle_rvalue(ir_rvalue **rvalue)
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ir_dereference_record *ir = (*rvalue)->as_dereference_record();
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ir_variable *var = ir->variable_referenced();
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if (!var->is_interface_instance())
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/* It should be possible to handle uniforms during this pass,
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* but, this will require changes to the other uniform block
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if (var->data.mode == ir_var_uniform || var->data.mode == ir_var_shader_storage)
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if (var->get_interface_type() != NULL) {
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char *iface_field_name =
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ralloc_asprintf(mem_ctx, "%s %s.%s.%s",
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var->data.mode == ir_var_shader_in ? "in" : "out",
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var->get_interface_type()->name,
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ir->record->type->fields.structure[ir->field_idx].name);
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/* Find the variable in the set of flattened interface blocks */
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hash_entry *entry = _mesa_hash_table_search(interface_namespace,
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ir_variable *found_var = (ir_variable *) entry->data;
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ir_dereference_variable *deref_var =
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new(mem_ctx) ir_dereference_variable(found_var);
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ir_dereference_array *deref_array =
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ir->record->as_dereference_array();
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if (deref_array != NULL) {
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*rvalue = process_array_ir(mem_ctx, deref_array,
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(ir_rvalue *)deref_var);
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lower_named_interface_blocks(void *mem_ctx, gl_linked_shader *shader)
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flatten_named_interface_blocks_declarations v_decl(mem_ctx);
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v_decl.run(shader->ir);