Add SDL_filesystem.h for SDL 2.0.1

src/SDL2.cs

@@ -5311,5 +5311,52 @@ namespace SDL2
 		);
 
 		#endregion
+
+		#region SDL_filesystem.h
+
+		/// <summary>
+		/// Get the path where the application resides.
+		///
+		/// Get the "base path". This is the directory where the application was run
+		/// from, which is probably the installation directory, and may or may not
+		/// be the process's current working directory.
+		///
+		/// This returns an absolute path in UTF-8 encoding, and is garunteed to
+		/// end with a path separator ('\\' on Windows, '/' most other places).
+		/// </summary>
+		/// <returns>string of base dir in UTF-8 encoding</returns>
+		/// <remarks>The underlying C string is owned by the application,
+		/// and can be NULL on some platforms.</remarks>
+		[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
+		[return : MarshalAs(UnmanagedType.CustomMarshaler, MarshalTypeRef = typeof(LPUtf8StrMarshaler), MarshalCookie = LPUtf8StrMarshaler.LeaveAllocated)]
+		public static extern string SDL_GetBasePath();
+
+		/// <summary>
+		/// Get the user-and-app-specific path where files can be written.
+		///
+		/// Get the "pref dir". This is meant to be where users can write personal
+		/// files (preferences and save games, etc) that are specific to your
+		/// application. This directory is unique per user, per application.
+		///
+		/// This function will decide the appropriate location in the native filesystem¸
+		/// create the directory if necessary, and return a string of the absolute
+		/// path to the directory in UTF-8 encoding.
+		/// </summary>
+		/// <param name="org">The name of your organization.</param>
+		/// <param name="app">The name of your application.</param>
+		/// <returns>UTF-8 string of user dir in platform-dependent notation. NULL
+		/// if there's a problem (creating directory failed, etc).</returns>
+		/// <remarks>The underlying C string is owned by the application,
+		/// and can be NULL on some platforms. .NET provides some similar functions.</remarks>
+		[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
+		[return : MarshalAs(UnmanagedType.CustomMarshaler, MarshalTypeRef = typeof(LPUtf8StrMarshaler), MarshalCookie = LPUtf8StrMarshaler.LeaveAllocated)]
+		public static extern string SDL_GetPrefPath(
+			[In()] [MarshalAs(UnmanagedType.CustomMarshaler, MarshalTypeRef = typeof(LPUtf8StrMarshaler))]
+			string org,
+			[In()] [MarshalAs(UnmanagedType.CustomMarshaler, MarshalTypeRef = typeof(LPUtf8StrMarshaler))]
+			string app
+		);
+
+		#endregion
 	}
 }