Added osgGA::Device class for integration of both physical and virtual devices.

Added template readFile(..) function to make it more convinient to cast to a specific object type.

Added support for osgGA::Device to osgViewer.

Added sdl plugin to provides very basic joystick osgGA::Device integration.

src/osgViewer/CompositeViewer.cpp

@@ -735,6 +735,7 @@ void CompositeViewer::eventTraversal()
         masterCameraVPW *= viewport->computeWindowMatrix();
     }
 
+    // get events from all windows attached to Viewer.
     for(Contexts::iterator citr = contexts.begin();
         citr != contexts.end();
         ++citr)
@@ -925,6 +926,20 @@ void CompositeViewer::eventTraversal()
         ++vitr)
     {
         View* view = vitr->get();
+
+        // get events from user Devices attached to Viewer.
+        for(osgViewer::View::Devices::iterator eitr = view->getDevices().begin();
+            eitr != view->getDevices().end();
+            ++eitr)
+        {
+            osgGA::Device* es = eitr->get();
+            es->checkEvents();
+
+            // open question, will we need to reproject mouse coordinates into current view's coordinate frame as is down for GraphicsWindow provided events?
+            // for now assume now and just get the events directly without any reprojection.
+            es->getEventQueue()->takeEvents(viewEventsMap[view], cutOffTime);
+        }
+
         view->getEventQueue()->takeEvents(viewEventsMap[view], cutOffTime);
     }
 

src/osgViewer/View.cpp

@@ -2217,3 +2217,20 @@ bool View::computeIntersections(float x,float y, const osg::NodePath& nodePath,
 }
 
 
+void View::addDevice(osgGA::Device* eventSource)
+{
+    Devices::iterator itr = std::find( _eventSources.begin(), _eventSources.end(), eventSource );
+    if (itr==_eventSources.end())
+    {
+        _eventSources.push_back(eventSource);
+    }
+}
+
+void View::removeDevice(osgGA::Device* eventSource)
+{
+    Devices::iterator itr = std::find( _eventSources.begin(), _eventSources.end(), eventSource );
+    if (itr!=_eventSources.end())
+    {
+        _eventSources.erase(itr);
+    }
+}

src/osgViewer/Viewer.cpp

@@ -645,6 +645,20 @@ void Viewer::eventTraversal()
     }
 
 
+    // get events from user Devices attached to Viewer.
+    for(Devices::iterator eitr = _eventSources.begin();
+        eitr != _eventSources.end();
+        ++eitr)
+    {
+        osgGA::Device* es = eitr->get();
+        es->checkEvents();
+
+        // open question, will we need to reproject mouse coordinates into current view's coordinate frame as is down for GraphicsWindow provided events?
+        // for now assume now and just get the events directly without any reprojection.
+        es->getEventQueue()->takeEvents(events, cutOffTime);
+    }
+
+    // get events from all windows attached to Viewer.
     for(Contexts::iterator citr = contexts.begin();
         citr != contexts.end();
         ++citr)