--- /dev/null
+/*
+ * Copyright (c) 2013 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+/**
+ * \file lower_named_interface_blocks.cpp
+ *
+ * This lowering pass converts all interface blocks with instance names
+ * into interface blocks without an instance name.
+ *
+ * For example, the following shader:
+ *
+ * out block {
+ * float block_var;
+ * } inst_name;
+ *
+ * main()
+ * {
+ * inst_name.block_var = 0.0;
+ * }
+ *
+ * Is rewritten to:
+ *
+ * out block {
+ * float block_var;
+ * };
+ *
+ * main()
+ * {
+ * block_var = 0.0;
+ * }
+ *
+ * This takes place after the shader code has already been verified with
+ * the interface name in place.
+ *
+ * The linking phase will use the interface block name rather than the
+ * interface's instance name when linking interfaces.
+ *
+ * This modification to the ir allows our currently existing dead code
+ * elimination to work with interface blocks without changes.
+ */
+
+#include "glsl_symbol_table.h"
+#include "ir.h"
+#include "ir_optimization.h"
+#include "ir_rvalue_visitor.h"
+#include "program/hash_table.h"
+
+class flatten_named_interface_blocks_declarations : public ir_rvalue_visitor
+{
+public:
+ void * const mem_ctx;
+ hash_table *interface_namespace;
+
+ flatten_named_interface_blocks_declarations(void *mem_ctx)
+ : mem_ctx(mem_ctx)
+ {
+ }
+
+ void run(exec_list *instructions);
+
+ virtual ir_visitor_status visit_leave(ir_assignment *);
+ virtual void handle_rvalue(ir_rvalue **rvalue);
+};
+
+void
+flatten_named_interface_blocks_declarations::run(exec_list *instructions)
+{
+ interface_namespace = hash_table_ctor(0, hash_table_string_hash,
+ hash_table_string_compare);
+
+ /* First pass: adjust instance block variables with an instance name
+ * to not have an instance name.
+ *
+ * The interface block variables are stored in the interface_namespace
+ * hash table so they can be used in the second pass.
+ */
+ foreach_list_safe(node, instructions) {
+ ir_variable *var = ((ir_instruction *) node)->as_variable();
+ if (!var || !var->is_interface_instance())
+ continue;
+
+ /* It should be possible to handle uniforms during this pass,
+ * but, this will require changes to the other uniform block
+ * support code.
+ */
+ if (var->mode == ir_var_uniform)
+ continue;
+
+ const glsl_type *const t = var->type;
+ exec_node *insert_pos = var;
+ char *iface_field_name;
+ for (unsigned i = 0; i < t->length; i++) {
+ iface_field_name = ralloc_asprintf(mem_ctx, "%s.%s", t->name,
+ t->fields.structure[i].name);
+
+ ir_variable *found_var =
+ (ir_variable *) hash_table_find(interface_namespace,
+ iface_field_name);
+ if (!found_var) {
+ ir_variable *new_var =
+ new(mem_ctx) ir_variable(t->fields.structure[i].type,
+ ralloc_strdup(mem_ctx, t->fields.structure[i].name),
+ (ir_variable_mode) var->mode);
+ new_var->interface_type = t;
+ hash_table_insert(interface_namespace, new_var,
+ iface_field_name);
+ insert_pos->insert_after(new_var);
+ insert_pos = new_var;
+ }
+ }
+ var->remove();
+ }
+
+ /* Second pass: visit all ir_dereference_record instances, and if they
+ * reference an interface block, then flatten the refererence out.
+ */
+ visit_list_elements(this, instructions);
+ hash_table_dtor(interface_namespace);
+ interface_namespace = NULL;
+}
+
+ir_visitor_status
+flatten_named_interface_blocks_declarations::visit_leave(ir_assignment *ir)
+{
+ ir_dereference_record *lhs_rec = ir->lhs->as_dereference_record();
+ if (lhs_rec) {
+ ir_rvalue *lhs_rec_tmp = lhs_rec;
+ handle_rvalue(&lhs_rec_tmp);
+ if (lhs_rec_tmp != lhs_rec) {
+ ir->set_lhs(lhs_rec_tmp);
+ }
+ }
+ return rvalue_visit(ir);
+}
+
+void
+flatten_named_interface_blocks_declarations::handle_rvalue(ir_rvalue **rvalue)
+{
+ if (*rvalue == NULL)
+ return;
+
+ ir_dereference_record *ir = (*rvalue)->as_dereference_record();
+ if (ir == NULL)
+ return;
+
+ ir_variable *var = ir->variable_referenced();
+
+ if (!var->is_interface_instance())
+ return;
+
+ /* It should be possible to handle uniforms during this pass,
+ * but, this will require changes to the other uniform block
+ * support code.
+ */
+ if (var->mode == ir_var_uniform)
+ return;
+
+ if (var->interface_type != NULL) {
+ char *iface_field_name =
+ ralloc_asprintf(mem_ctx, "%s.%s", var->interface_type->name,
+ ir->field);
+ /* Find the variable in the set of flattened interface blocks */
+ ir_variable *found_var =
+ (ir_variable *) hash_table_find(interface_namespace,
+ iface_field_name);
+ assert(found_var);
+ ir_dereference_variable *deref_var =
+ new(mem_ctx) ir_dereference_variable(found_var);
+ *rvalue = deref_var;
+ }
+}
+
+void
+lower_named_interface_blocks(void *mem_ctx, gl_shader *shader)
+{
+ flatten_named_interface_blocks_declarations v_decl(mem_ctx);
+ v_decl.run(shader->ir);
+}
+
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