From Wang Rui, added osgParticle serializers

src/osgWrappers/serializers/osgParticle/VariableRateCounter.cpp

@@ -0,0 +1,28 @@
+#include <osgParticle/VariableRateCounter>
+#include <osgDB/ObjectWrapper>
+#include <osgDB/InputStream>
+#include <osgDB/OutputStream>
+
+static bool checkRateRange( const osgParticle::VariableRateCounter& obj )
+{ return true; }
+
+static bool readRateRange( osgDB::InputStream& is, osgParticle::VariableRateCounter& obj )
+{
+    float min, max; is >> min >> max;
+    obj.setRateRange( min, max ); return true;
+}
+
+static bool writeRateRange( osgDB::OutputStream& os, const osgParticle::VariableRateCounter& obj )
+{
+    const osgParticle::rangef& range = obj.getRateRange();
+    os << range.minimum << range.maximum << std::endl;
+    return true;
+}
+
+REGISTER_OBJECT_WRAPPER( osgParticleVariableRateCounter,
+                         /*new osgParticle::VariableRateCounter*/NULL,
+                         osgParticle::VariableRateCounter,
+                         "osg::Object osgParticle::Counter osgParticle::VariableRateCounter" )
+{
+    ADD_USER_SERIALIZER( RateRange );  // _rate_range
+}