Stop the game from freezing if we play a song during a fadeout (#61)

desktop_version/src/Music.cpp

@@ -214,6 +214,8 @@ musicclass::musicclass()
 	nicefade = 0;
 	resumesong = 0;
 	volume = 0.0f;
+	fadeoutqueuesong = -1;
+	dontquickfade = false;
 }
 
 void musicclass::play(int t)
@@ -260,7 +262,16 @@ void musicclass::play(int t)
 				// musicchannel = musicchan[currentsong].play(0);
 				// musicchannel.soundTransform = new SoundTransform(0);
 				// musicchannel.addEventListener(Event.SOUND_COMPLETE, loopmusic);
-				if(Mix_FadeInMusic(musicTracks[t].m_music, -1, 3000)==-1)
+				if (Mix_FadingMusic() == MIX_FADING_OUT) {
+					// We're already fading out
+					fadeoutqueuesong = t;
+					currentsong = -1;
+					if (!dontquickfade)
+						Mix_FadeOutMusic(500); // fade out quicker
+					else
+						dontquickfade = false;
+				}
+				else if(Mix_FadeInMusic(musicTracks[t].m_music, -1, 3000)==-1)
 				{
 					printf("Mix_FadeInMusic: %s\n", Mix_GetError());
 				}
@@ -358,6 +369,11 @@ void musicclass::processmusic()
 	//if (musicfade > 0) processmusicfade();
 	//if (musicfadein > 0) processmusicfadein();
 
+	if (fadeoutqueuesong != -1 && Mix_PlayingMusic() == 0) {
+		play(fadeoutqueuesong);
+		fadeoutqueuesong = -1;
+	}
+
 	if (nicefade == 1 && Mix_PlayingMusic() == 0)
 	{
 		play(nicechange);

desktop_version/src/Music.h

@@ -56,6 +56,9 @@ public:
 
 	bool custompd;
 
+	int fadeoutqueuesong; // -1 if no song queued
+	bool dontquickfade;
+
 	// MMMMMM mod settings
 	bool mmmmmm;
 	bool usingmmmmmm;

desktop_version/src/Script.cpp

@@ -248,6 +248,7 @@ void scriptclass::run( KeyPoll& key, Graphics& dwgfx, Game& game, mapclass& map,
       if (words[0] == "musicfadeout")
 			{
 				music.fadeout();
+				music.dontquickfade = true;
 			}
 			if (words[0] == "musicfadein")
 			{