Added OpenDX writer from Randall Hopper.

src/osgPlugins/dx/StateSetStr.h

@@ -0,0 +1,18 @@
+#ifndef __OSG_STATESETSTR_H
+#define __OSG_STATESETSTR_H
+
+#include <osg/StateAttribute>
+
+namespace dx {
+
+const char *GLModeToModeStr( osg::StateAttribute::GLMode mode );
+
+osg::StateAttribute::GLMode GLModeStrToMode( const char mode_str[] );
+
+const char *OSGAttrToAttrStr( osg::StateAttribute::Type attr );
+
+osg::StateAttribute::Type OSGAttrStrToAttr( const char attr_str[] );
+
+};
+
+#endif