Refactoring

core/src/mindustry/audio/SoundLoop.java

@@ -0,0 +1,50 @@
+package mindustry.audio;
+
+import arc.audio.*;
+import arc.math.*;
+import arc.util.*;
+
+/** A simple class for playing a looping sound at a position.*/
+public class SoundLoop{
+    private static final float fadeSpeed = 0.05f;
+
+    private final Sound sound;
+    private int id = -1;
+    private float volume, baseVolume;
+
+    public SoundLoop(Sound sound, float baseVolume){
+        this.sound = sound;
+        this.baseVolume = baseVolume;
+    }
+
+    public void update(float x, float y, boolean play){
+        if(baseVolume < 0) return;
+
+        if(id < 0){
+            if(play){
+                id = sound.loop(sound.calcVolume(x, y) * volume * baseVolume, 1f, sound.calcPan(x, y));
+            }
+        }else{
+            //fade the sound in or out
+            if(play){
+                volume = Mathf.clamp(volume + fadeSpeed * Time.delta());
+            }else{
+                volume = Mathf.clamp(volume - fadeSpeed * Time.delta());
+                if(volume <= 0.001f){
+                    sound.stop(id);
+                    id = -1;
+                    return;
+                }
+            }
+            sound.setPan(id, sound.calcPan(x, y), sound.calcVolume(x, y) * volume * baseVolume);
+        }
+    }
+
+    public void stop(){
+        if(id != -1){
+            sound.stop(id);
+            id = -1;
+            volume = baseVolume = -1;
+        }
+    }
+}