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/osg/CMakeLists.txt

@@ -137,6 +137,7 @@ SET(TARGET_H
     ${HEADER_PATH}/RenderInfo
     ${HEADER_PATH}/SampleMaski
     ${HEADER_PATH}/Scissor
+    ${HEADER_PATH}/ScriptEngine
     ${HEADER_PATH}/Sequence
     ${HEADER_PATH}/ShadeModel
     ${HEADER_PATH}/Shader
@@ -323,6 +324,7 @@ SET(TARGET_SRC
     Referenced.cpp
     SampleMaski.cpp
     Scissor.cpp
+    ScriptEngine.cpp
     Sequence.cpp
     ShadeModel.cpp
     Shader.cpp

src/osg/ScriptEngine.cpp

@@ -0,0 +1,50 @@
+/* -*-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 <osg/ScriptEngine>
+#include <osg/UserDataContainer>
+
+using namespace osg;
+
+ScriptEngine* ScriptCallback::getScriptEngine(osg::NodePath& nodePath)
+{
+    if (!_script) return 0;
+
+    for(osg::NodePath::reverse_iterator itr = nodePath.rbegin();
+        itr != nodePath.rend();
+        ++itr)
+    {
+        osg::Node* node = *itr;
+        osg::UserDataContainer* udc = node->getUserDataContainer();
+        if (udc)
+        {
+            ScriptEngine* engine = dynamic_cast<ScriptEngine*>(udc->getUserObject(_script->getLanguage()));
+            if (engine) return engine;
+        }
+    }
+    return 0;
+}
+
+void ScriptCallback::operator()(Node* node, NodeVisitor* nv)
+{
+    ScriptEngine* engine = getScriptEngine(nv->getNodePath());
+    if (engine && _script.valid())
+    {
+        engine->run(_script.get());
+    }
+
+    // note, callback is responsible for scenegraph traversal so
+    // they must call traverse(node,nv) to ensure that the
+    // scene graph subtree (and associated callbacks) are traversed.
+    traverse(node,nv);
+}