Added initial cut of basic scripting support, introducing an osg::Script object to wrap up the individual scripts, osg::ScriptCallback for assigning a Script as node callback and an osg::ScriptEngine base class that plugins implement to provided support for specific scripting languages.

Provided are lua, python and V8 (for javascript) plugins that just open up enough of a link to the respective libs to run a script, there is no scene graph <-> script communication in current implementation.

src/osgPlugins/lua/LuaScriptEngine.cpp

@@ -0,0 +1,51 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2013 Robert Osfield
+ *
+ * This library is open source and may be redistributed and/or modified under
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ *
+ * This library 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
+ * OpenSceneGraph Public License for more details.
+*/
+
+#include "LuaScriptEngine.h"
+
+using namespace lua;
+
+LuaScriptEngine::LuaScriptEngine():
+    osg::ScriptEngine("lua"),
+    _lua(0)
+{
+    initialize();
+}
+
+LuaScriptEngine::LuaScriptEngine(const LuaScriptEngine& rhs, const osg::CopyOp&):
+    osg::ScriptEngine("lua"),
+    _lua(0)
+{
+    initialize();
+}
+
+LuaScriptEngine::~LuaScriptEngine()
+{
+    lua_close(_lua);
+}
+
+void LuaScriptEngine::initialize()
+{
+    _lua = lua_open();
+    luaL_openlibs(_lua);
+}
+
+void LuaScriptEngine::run(osg::Script* script)
+{
+    if (!script || !_lua) return;
+
+    if (luaL_dostring(_lua, script->getScript().c_str()))
+    {
+        OSG_NOTICE << "LuaScriptEngine::run(Script*) error: " << lua_tostring(_lua, -1) << std::endl;
+    }
+}