Data driven char select grid positions

source/funkin/data/freeplay/player/PlayerData.hx

@@ -38,6 +38,12 @@ class PlayerData
   @:optional
   public var freeplayDJ:Null<PlayerFreeplayDJData> = null;
 
+  /**
+   * Data for displaying this character in the Character Select menu.
+   * If null, exclude from Character Select.
+   */
+  @:optional
+  public var charSelect:Null<PlayerCharSelectData> = null;
 
   /**
    * Data for displaying this character in the results screen.
@@ -233,6 +239,18 @@ class PlayerFreeplayDJData
   }
 }
 
+class PlayerCharSelectData
+{
+  /**
+   * A zero-indexed number for the character's preferred position in the grid.
+   * 0 = top left, 4 = center, 8 = bottom right
+   * In the event of a conflict, the first character alphabetically gets it,
+   * and others get shifted over.
+   */
+  @:optional
+  public var position:Null<Int>;
+}
+
 typedef PlayerResultsData =
 {
   var perfect:Array<PlayerResultsAnimationData>;

source/funkin/ui/charSelect/CharSelectSubState.hx

@@ -67,8 +67,29 @@ class CharSelectSubState extends MusicBeatSubState
   {
     super();
 
-    availableChars.set(4, "bf");
-    availableChars.set(3, "pico");
+    loadAvailableCharacters();
+  }
+
+  function loadAvailableCharacters():Void
+  {
+    var playerIds:Array<String> = PlayerRegistry.instance.listEntryIds();
+
+    for (playerId in playerIds)
+    {
+      var player:Null<PlayableCharacter> = PlayerRegistry.instance.fetchEntry(playerId);
+      if (player == null) continue;
+      var playerData = player.getCharSelectData();
+      if (playerData == null) continue;
+
+      var targetPosition:Int = playerData.position ?? 0;
+      while (availableChars.exists(targetPosition))
+      {
+        targetPosition += 1;
+      }
+
+      trace('Placing player ${playerId} at position ${targetPosition}');
+      availableChars.set(targetPosition, playerId);
+    }
   }
 
   override public function create():Void

source/funkin/ui/freeplay/charselect/PlayableCharacter.hx

@@ -88,6 +88,11 @@ class PlayableCharacter implements IRegistryEntry<PlayerData>
     return _data.freeplayDJ.getFreeplayDJText(index);
   }
 
+  public function getCharSelectData():PlayerCharSelectData
+  {
+    return _data.charSelect;
+  }
+
   /**
    * @param rank Which rank to get info for
    * @return An array of animations. For example, BF Great has two animations, one for BF and one for GF