Use IsGameModeAvail for duet check

Vocaluxe/Base/CBackgroundMusic.cs

@@ -90,11 +90,6 @@ namespace Vocaluxe.Base
             get { return _CurrentPlaylistElement.SongID; }
         }
 
-        public static bool Duet
-        {
-            get { return _CurrentPlaylistElement.Duet; }
-        }
-
         public static bool SongHasVideo
         {
             get { return File.Exists(_CurrentPlaylistElement.VideoFilePath); }
@@ -581,17 +576,6 @@ namespace Vocaluxe.Base
             }
         }
 
-        public bool Duet
-        {
-            get
-            {
-                if (_Song != null)
-                    return _Song.IsDuet;
-
-                return false;
-            }
-        }
-
         public CPlaylistElement(CSong song)
         {
             MusicFilePath = string.Empty;

Vocaluxe/Base/CMain.cs

@@ -532,6 +532,11 @@ namespace Vocaluxe.Base
             return CGame.GetTimeFromBeats(beat, bpm);
         }
 
+        public float GetBeatFromTime(float time, float bpm, float gap)
+        {
+            return CGame.GetBeatFromTime(time, bpm, gap);
+        }
+
         public void AddSong(int songID, EGameMode gameMode)
         {
             CGame.AddSong(songID, gameMode);

Vocaluxe/GameModes/CGameModes.cs

@@ -52,7 +52,7 @@ namespace Vocaluxe.GameModes
     {
         protected override CSong _PrepareSong(CSong song)
         {
-            return song;
+            return (song.IsGameModeAvailable(EGameMode.TR_GAMEMODE_NORMAL)) ? song : null;
         }
     }
 
@@ -60,7 +60,7 @@ namespace Vocaluxe.GameModes
     {
         protected override CSong _PrepareSong(CSong song)
         {
-            return (song.IsDuet) ? song : null;
+            return (song.IsGameModeAvailable(EGameMode.TR_GAMEMODE_DUET)) ? song : null;
         }
     }
 
@@ -68,6 +68,8 @@ namespace Vocaluxe.GameModes
     {
         protected override CSong _PrepareSong(CSong song)
         {
+            if (!song.IsGameModeAvailable(EGameMode.TR_GAMEMODE_SHORTSONG))
+                return null;
             var newSong = new CSong(song) {Finish = CGame.GetTimeFromBeats(song.ShortEnd.EndBeat, song.BPM) + CSettings.DefaultMedleyFadeOutTime + song.Gap};
             // set lines to short mode
             newSong.Notes.SetMedley(0, song.ShortEnd.EndBeat);
@@ -80,6 +82,8 @@ namespace Vocaluxe.GameModes
     {
         protected override CSong _PrepareSong(CSong song)
         {
+            if (!song.IsGameModeAvailable(EGameMode.TR_GAMEMODE_MEDLEY))
+                return null;
             var newSong = new CSong(song) {Start = CGame.GetTimeFromBeats(song.Medley.StartBeat, song.BPM) - song.Medley.FadeInTime + song.Gap};
             if (newSong.Start < 0f)
                 newSong.Start = 0f;

Vocaluxe/Lib/Playlist/CPlaylistFile.cs

@@ -180,7 +180,11 @@ namespace Vocaluxe.Lib.Playlist
 
         public void AddSong(int songID)
         {
-            var song = new CPlaylistSong {SongID = songID, GameMode = CSongs.GetSong(songID).IsDuet ? EGameMode.TR_GAMEMODE_DUET : EGameMode.TR_GAMEMODE_NORMAL};
+            var song = new CPlaylistSong
+                {
+                    SongID = songID,
+                    GameMode = CSongs.GetSong(songID).IsGameModeAvailable(EGameMode.TR_GAMEMODE_DUET) ? EGameMode.TR_GAMEMODE_DUET : EGameMode.TR_GAMEMODE_NORMAL
+                };
 
             Songs.Add(song);
         }

Vocaluxe/Screens/CPopupScreenPlayerControl.cs

@@ -200,7 +200,7 @@ namespace Vocaluxe.Screens
             CGame.ClearSongs();
 
             var gm = EGameMode.TR_GAMEMODE_NORMAL;
-            if (CSongs.AllSongs[songNr].IsDuet)
+            if (CSongs.AllSongs[songNr].IsGameModeAvailable(EGameMode.TR_GAMEMODE_DUET))
                 gm = EGameMode.TR_GAMEMODE_DUET;
 
             CGame.AddSong(songNr, gm);

Vocaluxe/SongQueue/CSongQueue.cs

@@ -69,7 +69,7 @@ namespace Vocaluxe.SongQueue
 
         private bool _AddSong(int songID, EGameMode gameMode)
         {
-            if (gameMode == EGameMode.TR_GAMEMODE_DUET && !CSongs.GetSong(songID).IsDuet)
+            if (CSongs.GetSong(songID).IsGameModeAvailable(gameMode))
                 return false;
 
             _SongQueue.Add(new SSongQueueEntry(songID, gameMode));

VocaluxeLib/Menu/CPlaylist.cs

@@ -971,11 +971,11 @@ namespace VocaluxeLib.Menu
 
                         if (!mouseEvent.LBH && DragAndDropSongID != -1)
                         {
-                            var gm = EGameMode.TR_GAMEMODE_NORMAL;
                             CSong song = CBase.Songs.GetSongByID(DragAndDropSongID);
 
                             if (song != null)
                             {
+                                var gm = EGameMode.TR_GAMEMODE_NORMAL;
                                 if (song.IsDuet)
                                     gm = EGameMode.TR_GAMEMODE_DUET;