Experimental-ish rollback functionality

src/rollback.h

@@ -0,0 +1,51 @@
+/*
+Minetest-c55
+Copyright (C) 2012 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser 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.
+*/
+
+#ifndef ROLLBACK_HEADER
+#define ROLLBACK_HEADER
+
+#include <string>
+#include "irr_v3d.h"
+#include "rollback_interface.h"
+#include <list>
+
+class IGameDef;
+
+class IRollbackManager: public IRollbackReportSink
+{
+public:
+	// IRollbackReportManager
+	virtual void reportAction(const RollbackAction &action) = 0;
+	virtual std::string getActor() = 0;
+	virtual void setActor(const std::string &actor) = 0;
+
+	virtual ~IRollbackManager(){}
+	virtual void flush() = 0;
+	// Get last actor that did something to position p, but not further than
+	// <seconds> in history
+	virtual std::string getLastNodeActor(v3s16 p, int range, int seconds,
+			v3s16 *act_p, int *act_seconds) = 0;
+	// Get actions to revert <seconds> of history made by <actor>
+	virtual std::list<RollbackAction> getRevertActions(const std::string &actor,
+			int seconds) = 0;
+};
+
+IRollbackManager *createRollbackManager(const std::string &filepath, IGameDef *gamedef);
+
+#endif