1 files changed, 58 insertions, 0 deletions
diff --git a/source/blender/depsgraph/intern/eval/deg_eval_runtime_backup_modifier.h b/source/blender/depsgraph/intern/eval/deg_eval_runtime_backup_modifier.h
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+++ b/source/blender/depsgraph/intern/eval/deg_eval_runtime_backup_modifier.h
@@ -0,0 +1,58 @@
+/*
+ * 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) 2019 Blender Foundation.
+ * All rights reserved.
+ */
+
+/** \file
+ * \ingroup depsgraph
+ */
+
+#pragma once
+
+#include "BKE_modifier.h"
+
+#include "intern/depsgraph_type.h"
+
+struct ModifierData;
+
+namespace DEG {
+
+struct Depsgraph;
+
+/* Identifier used to match modifiers to backup/restore their runtime data.
+ * Identification is happening using original modifier data pointer and the
+ * modifier type.
+ * It is not enough to only pointer, since it's possible to have a situation
+ * when modifier is removed and a new one added, and due to memory allocation
+ * policy they might have same pointer.
+ * By adding type into matching we are at least ensuring that modifier will not
+ * try to interpret runtime data created by another modifier type. */
+class ModifierDataBackupID {
+ public:
+  ModifierDataBackupID(const Depsgraph *depsgraph);
+  ModifierDataBackupID(ModifierData *modifier_data, ModifierType type);
+
+  bool operator<(const ModifierDataBackupID &other) const;
+
+  ModifierData *modifier_data;
+  ModifierType type;
+};
+
+/* Storage for backed up runtime modifier data. */
+typedef map<ModifierDataBackupID, void *> ModifierRuntimeDataBackup;
+
+}  // namespace DEG