Added --login url username password http authentication option

applications/osgviewer/osgviewer.cpp

@@ -39,6 +39,7 @@ int main(int argc, char** argv)
     arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
     arguments.getApplicationUsage()->addCommandLineOption("--image <filename>","Load an image and render it on a quad");
     arguments.getApplicationUsage()->addCommandLineOption("--dem <filename>","Load an image/DEM and render it on a HeightField");
+    arguments.getApplicationUsage()->addCommandLineOption("--login <url> <username> <password>","Provide authentication information for http file access.");
 
     osgViewer::Viewer viewer(arguments);
 
@@ -62,6 +63,19 @@ int main(int argc, char** argv)
         return 1;
     }
 
+    std::string url, username, password;
+    while(arguments.read("--login",url, username, password))
+    {
+        if (!osgDB::Registry::instance()->getAuthenticationMap())
+        {
+            osgDB::Registry::instance()->setAuthenticationMap(new osgDB::AuthenticationMap);
+            osgDB::Registry::instance()->getAuthenticationMap()->addAuthenticationDetails(
+                url,
+                new osgDB::AuthenticationDetails(username, password)
+            );
+        }
+    }
+
     // set up the camera manipulators.
     {
         osg::ref_ptr<osgGA::KeySwitchMatrixManipulator> keyswitchManipulator = new osgGA::KeySwitchMatrixManipulator;