Unloading Sprite Atlas using Addressables

Hello, I'm in the process of moving our project assets to sprite atlases and use addressables to load them up. This is working correctly by using the SpriteAtlasManager callbacks to handling loading.

Code (CSharp):

1. public void StartHandlingSpriteAtlases()
2.     {
3.         SpriteAtlasManager.atlasRequested += SpriteAtlasManagerOnAtlasRequested;
4.         SpriteAtlasManager.atlasRegistered += SpriteAtlasManagerOnAtlasRegistered;
5.     }
6.  
7.     public void StoptHandlingSpriteAtlases()
8.     {
9.         SpriteAtlasManager.atlasRequested -= SpriteAtlasManagerOnAtlasRequested;
10.         SpriteAtlasManager.atlasRegistered -= SpriteAtlasManagerOnAtlasRegistered;
11.     }
12.    
13.     private void SpriteAtlasManagerOnAtlasRegistered(SpriteAtlas spriteAtlas)
14.     {
15.         Assert.IsNotNull(spriteAtlas, "Found null sprite Atlas!");
16.         Debugger.LogInfo($"Registered Sprite Atlas {spriteAtlas.name}");
17.     }
18.  
19.     private void SpriteAtlasManagerOnAtlasRequested(string atlasId, Action<SpriteAtlas> callback)
20.     {
21.         LoadAtlasFromAddressables(atlasId, callback);
22.     }
23.  
24.     private async void LoadAtlasFromAddressables(string atlasId, Action<SpriteAtlas> callback)
25.     {
26.         SpriteAtlas spriteAtlas = await Addressables.LoadAssetAsync<SpriteAtlas>(atlasId);
27.         callback(spriteAtlas);
28.     }

My question is then, what is the suggested process to unload sprite atlases. The SpriteAtlasManager doesn't seem to provide any interface that lets me know that it is done using an atlas, and short of doing reference counting myself (which would involve tagging every place where I use a sprite) I don't see a way in which I can unload the atlases, and since I had to do the load manually I doubt Unity is handling the unloading for me.

Any suggestions or advice is welcome.

 

Hi there, did you figure this out? Is it ok to just leave it loaded in memory?

Curious how it works when "Include in Build" is checked.