The GtkRadiant sources as originally released under the GPL license.

include/imodel.h

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+/*
+Copyright (C) 2001-2006, William Joseph.
+All Rights Reserved.
+
+This file is part of GtkRadiant.
+
+GtkRadiant 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.
+
+GtkRadiant 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 GtkRadiant; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#if !defined(INCLUDED_IMODEL_H)
+#define INCLUDED_IMODEL_H
+
+#include "generic/constant.h"
+
+namespace scene
+{
+  class Node;
+}
+
+class ArchiveFile;
+
+class ModelLoader
+{
+public:
+  INTEGER_CONSTANT(Version, 1);
+  STRING_CONSTANT(Name, "model");
+  virtual scene::Node& loadModel(ArchiveFile& file) = 0;
+};
+
+template<typename Type>
+class Modules;
+typedef Modules<ModelLoader> ModelModules;
+
+template<typename Type>
+class ModulesRef;
+typedef ModulesRef<ModelLoader> ModelModulesRef;
+
+#endif /* _IMODEL_H_ */