Add S_LoadSongCredit/S_UnloadSongCredit, refactor cursongcredit

- cursongcredit behaves the same as before
- Always compose song credit string
- g_realsongcredit always stores the song credit for the
  current music, even if no song credit is displayed on
  the HUD

src/hu_stuff.c

@@ -883,7 +883,7 @@ static void Got_Saycmd(UINT8 **p, INT32 playernum)
 
 void HU_TickSongCredits(void)
 {
-	if (cursongcredit.def == NULL) // No def
+	if (cursongcredit.text == NULL) // No def
 	{
 		cursongcredit.x = cursongcredit.old_x = 0;
 		cursongcredit.anim = 0;
@@ -1991,7 +1991,7 @@ static void HU_DrawDemoInfo(void)
 //
 void HU_DrawSongCredits(void)
 {
-	if (!cursongcredit.def || cursongcredit.trans >= NUMTRANSMAPS) // No def
+	if (!cursongcredit.text || cursongcredit.trans >= NUMTRANSMAPS) // No def
 	{
 		return;
 	}

src/music_manager.cpp

@@ -60,6 +60,7 @@ void TuneManager::tick()
 			// Only stop the music credit if the song actually
 			// changed.
 			S_StopMusicCredit();
+			S_UnloadMusicCredit();
 		}
 
 		stop_credit_ = false;
@@ -91,6 +92,8 @@ void TuneManager::tick()
 			adjust_volume();
 			I_SetSongSpeed(tune->speed());
 
+			S_LoadMusicCredit();
+
 			if (tune->credit && !tune->resume)
 			{
 				S_ShowMusicCredit();

src/p_setup.cpp

@@ -7629,8 +7629,7 @@ static void P_InitLevelSettings(void)
 	g_quakes = NULL;
 
 	// song credit init
-	Z_Free(cursongcredit.text);
-	memset(&cursongcredit,0,sizeof(struct cursongcredit));
+	S_StopMusicCredit();
 	cursongcredit.trans = NUMTRANSMAPS;
 
 	for (i = 0; i < MAXPLAYERS; i++)

src/s_sound.c

@@ -1244,6 +1244,7 @@ void S_AttemptToRestoreMusic(void)
 
 musicdef_t *musicdefstart = NULL;
 struct cursongcredit cursongcredit; // Currently displayed song credit info
+char *g_realsongcredit;
 struct soundtest soundtest; // Sound Test (sound test)
 
 static void S_InsertMusicAtSoundTestSequenceTail(const char *musname, UINT16 map, UINT8 altref, musicdef_t ***tail)
@@ -2093,11 +2094,11 @@ void S_InitMusicDefs(void)
 }
 
 //
-// S_ShowMusicCredit
+// S_LoadMusicCredit
 //
-// Display current song's credit on screen
+// Load the current song's credit into memory
 //
-void S_ShowMusicCredit(void)
+void S_LoadMusicCredit(void)
 {
 	UINT8 i = 0;
 	musicdef_t *def = S_FindMusicDef(Music_CurrentSong(), &i);
@@ -2107,18 +2108,13 @@ void S_ShowMusicCredit(void)
 	size_t len = 128, worklen;
 	INT32 widthused = (3*BASEVIDWIDTH/4) - 7, workwidth;
 
-	if (!cv_songcredits.value)
-		return;
+	S_UnloadMusicCredit();
 
 	if (!def) // No definitions
 		return;
 
 	if (!def->title)
-	{
-		// Like showing a blank credit.
-		S_StopMusicCredit();
 		return;
-	}
 
 	work = va("\x1F %s", def->title);
 	worklen = strlen(work);
@@ -2166,9 +2162,34 @@ void S_ShowMusicCredit(void)
 	if (credittext[0] == '\0')
 		return;
 
-	cursongcredit.def = def;
+	g_realsongcredit = Z_StrDup(credittext);
+}
+
+void S_UnloadMusicCredit(void)
+{
+	Z_Free(g_realsongcredit);
+	g_realsongcredit = NULL;
+}
+
+//
+// S_ShowMusicCredit
+//
+// Display current song's credit on screen
+//
+void S_ShowMusicCredit(void)
+{
+	if (!cv_songcredits.value)
+		return;
+
+	if (!g_realsongcredit)
+	{
+		// Like showing a blank credit.
+		S_StopMusicCredit();
+		return;
+	}
+
 	Z_Free(cursongcredit.text);
-	cursongcredit.text = Z_StrDup(credittext);
+	cursongcredit.text = Z_StrDup(g_realsongcredit);
 	cursongcredit.anim = 5*TICRATE;
 	cursongcredit.x = cursongcredit.old_x = 0;
 	cursongcredit.trans = NUMTRANSMAPS;
@@ -2176,7 +2197,8 @@ void S_ShowMusicCredit(void)
 
 void S_StopMusicCredit(void)
 {
-	cursongcredit.def = NULL;
+	Z_Free(cursongcredit.text);
+	memset(&cursongcredit,0,sizeof(struct cursongcredit));
 }
 
 /// ------------------------

src/s_sound.h

@@ -174,9 +174,9 @@ struct musicdef_t
 	soundtestsequence_t sequence;
 };
 
+// For HUD, doesn't always appear
 extern struct cursongcredit
 {
-	musicdef_t *def;
 	char *text;
 	UINT16 anim;
 	UINT8 trans;
@@ -184,6 +184,9 @@ extern struct cursongcredit
 	fixed_t old_x;
 } cursongcredit;
 
+// For menu, always appears
+extern char *g_realsongcredit;
+
 extern struct soundtest
 {
 	UINT8 tune;							// Tune used for music system
@@ -216,6 +219,8 @@ extern musicdef_t *musicdefstart;
 void S_LoadMusicDefs(UINT16 wadnum);
 void S_InitMusicDefs(void);
 musicdef_t *S_FindMusicDef(const char *name, UINT8 *i);
+void S_LoadMusicCredit(void);
+void S_UnloadMusicCredit(void);
 void S_ShowMusicCredit(void);
 void S_StopMusicCredit(void);