1 files changed, 76 insertions, 0 deletions
diff --git a/source/blender/depsgraph/intern/builder/deg_builder_relations_drivers.h b/source/blender/depsgraph/intern/builder/deg_builder_relations_drivers.h
new file mode 100644
index 00000000000..c80c69be9e2
--- /dev/null
+++ b/source/blender/depsgraph/intern/builder/deg_builder_relations_drivers.h
@@ -0,0 +1,76 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2013 Blender Foundation.
+ * All rights reserved.
+ */
+
+/** \file
+ * \ingroup depsgraph
+ */
+
+#pragma once
+
+#include "BLI_string_ref.hh"
+
+#include "RNA_types.h"
+
+#include "intern/builder/deg_builder_relations.h"
+
+struct FCurve;
+
+namespace blender {
+namespace deg {
+
+/* Helper class for determining which relations are needed between driver evaluation nodes. */
+class DriverDescriptor {
+ public:
+  /* Drivers are grouped by their RNA prefix. The prefix is the part of the RNA
+   * path up to the last dot, the suffix is the remainder of the RNA path:
+   *
+   * fcu->rna_path                     rna_prefix              rna_suffix
+   * -------------------------------   ----------------------  ----------
+   * 'color'                           ''                      'color'
+   * 'rigidbody_world.time_scale'      'rigidbody_world'       'time_scale'
+   * 'pose.bones["master"].location'   'pose.bones["master"]'  'location'
+   */
+  StringRef rna_prefix;
+  StringRef rna_suffix;
+
+ public:
+  DriverDescriptor(PointerRNA *id_ptr, FCurve *fcu);
+
+  bool driver_relations_needed() const;
+  bool is_array() const;
+  /* Assumes that 'other' comes from the same RNA group, that is, has the same RNA path prefix. */
+  bool is_same_array_as(const DriverDescriptor &other) const;
+  OperationKey depsgraph_key() const;
+
+ private:
+  PointerRNA *id_ptr_;
+  FCurve *fcu_;
+  bool driver_relations_needed_;
+
+  PointerRNA pointer_rna_;
+  PropertyRNA *property_rna_;
+  bool is_array_;
+
+  bool determine_relations_needed();
+  void split_rna_path();
+  bool resolve_rna();
+};
+
+}  // namespace deg
+}  // namespace blender