feat: implement SelectBGM

SelectBGM/MU3.Sequence/patch_Play.cs

@@ -0,0 +1,38 @@
+using MU3.Data;
+using MU3.Game;
+using MU3.Util;
+using System;
+
+namespace MU3.Sequence;
+class patch_Play: Play {
+    private LocalSessionInfo _localSessionInfo;
+
+    public static int RecentID = 6;
+    private extern void orig_Enter_Login();
+    private void Enter_Login() {
+        orig_Enter_Login();
+        using IniFile iniFile = new("mu3.ini");
+        var index = iniFile.getIntValue("Extra", "BGM", 6);
+        if(index == 0) {
+            var rnd = new Random();
+            index = rnd.Next(1, 7);
+        }
+        if(index < 0 || index > 6) {
+            index = 6;
+        }
+        RecentID = index;
+        Singleton<GameSound>.instance.gameBGM.playBGM(233, index);
+    }
+
+    private extern void orig_Enter_ChapterSelect();
+    private void Enter_ChapterSelect() {
+        patch_GameBGM.WithholdPlay = true;
+        orig_Enter_ChapterSelect();
+        patch_GameBGM.WithholdPlay = false;
+
+        int selectorID = SingletonStateMachine<DataManager, DataManager.EState>.instance.getMemoryChapterData(
+            _localSessionInfo.chapterSelection.memoryChapterId
+        )?.getMemoryChapterSelectorID() ?? RecentID;
+        Singleton<GameSound>.instance.gameBGM.playBGM(233, selectorID);
+    }
+}