audiocodex: no shared music instances

src/net/torvald/terrarum/audio/AudioCodex.kt

@@ -1,10 +1,7 @@
 package net.torvald.terrarum.audio
 
 import com.badlogic.gdx.Gdx
-import com.badlogic.gdx.audio.Music
 import com.badlogic.gdx.files.FileHandle
-import com.badlogic.gdx.utils.Disposable
-import net.torvald.terrarum.Terrarum
 import net.torvald.terrarum.modulebasegame.MusicContainer
 import net.torvald.terrarum.tryDispose
 
@@ -13,22 +10,25 @@ typealias MaterialID = String
 /**
  * Created by minjaesong on 2023-12-02.
  */
-class AudioCodex: Disposable {
+class AudioCodex {
 
-    @Transient val footsteps = HashMap<MaterialID, HashSet<MusicContainer>>()
+    @Transient val footsteps = HashMap<MaterialID, HashSet<FileHandle>>()
 
     internal constructor()
 
     fun addToFootstepPool(materialID: MaterialID, music: FileHandle) {
         if (footsteps[materialID] == null) footsteps[materialID] = HashSet()
-        footsteps[materialID]!!.add(
-            MusicContainer(music.nameWithoutExtension(), music.file(), Gdx.audio.newMusic(music)) {}
-        )
+        footsteps[materialID]!!.add(music)
     }
 
-    fun getRandomFootstep(materialID: MaterialID) = footsteps[materialID]?.random()
-
-    override fun dispose() {
-        footsteps.values.forEach { it.forEach { it.gdxMusic.tryDispose() } }
+    fun getRandomFootstep(materialID: MaterialID): MusicContainer? {
+        val file = footsteps[materialID]?.random()
+        return if (file != null) {
+            MusicContainer(file.nameWithoutExtension(), file.file(), Gdx.audio.newMusic(file)) {
+                it.tryDispose()
+            }
+        }
+        else null
     }
+
 }