V2 spatial partition, and all the pipeline changes that go with it.

Note: Deferred mode is not finished, and thus broken. Don't use!

indra/newview/llvoclouds.cpp

@@ -123,7 +123,10 @@ BOOL LLVOClouds::updateGeometry(LLDrawable *drawable)
 		return TRUE;
 	}
 	
-	dirtySpatialGroup();
+	if (drawable->isVisible())
+	{
+		dirtySpatialGroup(TRUE);
+	}
 
 	LLFace *facep;