Introduced new osg::PatchParameter StateAttribute class to wrap up glPatchParameter associated state.

Note, osg::Program::setParameter(GL_PATCH_VERTICES,num); is nolonger support and should be replaced by using the new PatchParameter class.

src/osgWrappers/serializers/osg/PatchParameter.cpp

@@ -0,0 +1,14 @@
+#include <osg/PatchParameter>
+#include <osgDB/ObjectWrapper>
+#include <osgDB/InputStream>
+#include <osgDB/OutputStream>
+
+REGISTER_OBJECT_WRAPPER( PatchParameter,
+                         new osg::PatchParameter,
+                         osg::PatchParameter,
+                         "osg::Object osg::StateAttribute osg::PatchParameter" )
+{
+    ADD_INT_SERIALIZER( Vertices, 3);
+    ADD_VEC2_SERIALIZER( PatchDefaultInnerLevel, osg::Vec2(1.0f,1.0f));
+    ADD_VEC4_SERIALIZER( PatchDefaultOuterLevel, osg::Vec4(1.0f,1.0f,1.0f,1.0f));
+}