diff -ruN ogrenew.orig/RenderSystems/GL/include/OgreSDLWindow.h ogrenew.1/RenderSystems/GL/include/OgreSDLWindow.h
--- ogrenew.orig/RenderSystems/GL/include/OgreSDLWindow.h	2006-06-19 14:48:23.000000000 +0400
+++ ogrenew.1/RenderSystems/GL/include/OgreSDLWindow.h	2006-06-27 15:37:21.000000000 +0400
@@ -70,6 +70,10 @@
         }
 
 		bool requiresTextureFlipping() const { return false; }
+		bool isFullScreen(void) const
+		{
+			return (mScreen->flags & SDL_FULLSCREEN) == SDL_FULLSCREEN;
+		}
     };
 }