Added initial cut at support for osgVolume in .ive format.

src/osgPlugins/ive/VolumeLayer.cpp

@@ -0,0 +1,61 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2008 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 "Exception.h"
+#include "VolumeLayer.h"
+#include "VolumeLocator.h"
+#include "Object.h"
+
+#include "VolumeImageLayer.h"
+#include "VolumeCompositeLayer.h"
+
+#include <osgDB/ReadFile>
+
+using namespace ive;
+
+void VolumeLayer::write(DataOutputStream* out)
+{
+    // Write Layer's identification.
+    out->writeInt(IVEVOLUMELAYER);
+
+    // If the osg class is inherited by any other class we should also write this to file.
+    osg::Object*  object = dynamic_cast<osg::Object*>(this);
+    if (object)
+        ((ive::Object*)(object))->write(out);
+    else
+        throw Exception("VolumeLayer::write(): Could not cast this osgVolume::Layer to an osg::Object.");
+
+    out->writeVolumeLocator(getLocator());
+}
+
+void VolumeLayer::read(DataInputStream* in)
+{
+    // Peek on Layer's identification.
+    int id = in->peekInt();
+    if (id != IVEVOLUMELAYER)
+        throw Exception("VolumeLayer::read(): Expected Layer identification.");
+    
+    // Read Layer's identification.
+    id = in->readInt();
+
+    // If the osg class is inherited by any other class we should also read this from file.
+    osg::Object*  object = dynamic_cast<osg::Object*>(this);
+    if(object)
+        ((ive::Object*)(object))->read(in);
+    else
+        throw Exception("VolumeLayer::read(): Could not cast this osgVolume::Layer to an osg::Object.");
+
+    setLocator(in->readVolumeLocator());
+
+}
+