a mess

core/src/io/anuke/mindustry/game/MusicControl.java

@@ -1,4 +1,39 @@
 package io.anuke.mindustry.game;
 
+import io.anuke.annotations.Annotations.*;
+import io.anuke.arc.audio.*;
+import io.anuke.arc.math.*;
+import io.anuke.arc.util.*;
+
 public class MusicControl{
+    private static final float finTime = 80f, foutTime = 80f;
+    private @Nullable Music current;
+
+    public void play(@Nullable Music music){
+        if(current == null && music != null){
+            current = music;
+            current.setLooping(true);
+            current.setVolume(0f);
+            current.play();
+        }else if(current == music && music != null){
+            current.setVolume(Mathf.clamp(current.getVolume() + Time.delta()/finTime));
+        }else if(current != null){
+            current.setVolume(Mathf.clamp(current.getVolume() - Time.delta()/foutTime));
+
+            if(current.getVolume() <= 0.01f){
+                current.stop();
+                current = null;
+                if(music != null){
+                    current = music;
+                    current.setVolume(0f);
+                    current.setLooping(true);
+                    current.play();
+                }
+            }
+        }
+    }
+
+    public void silence(){
+        play(null);
+    }
 }