102 lines
2.9 KiB
C#
102 lines
2.9 KiB
C#
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using UnityEngine;
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using System;
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#if UNITY_EDITOR
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using UnityEditor;
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#endif
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// This call is the type used by any other code to hold a reference to an object by GUID
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// If the target object is loaded, it will be returned, otherwise, NULL will be returned
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// This always works in Game Objects, so calling code will need to use GetComponent<>
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// or other methods to track down the specific objects need by any given system
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// Ideally this would be a struct, but we need the ISerializationCallbackReciever
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[System.Serializable]
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public class GuidReference : ISerializationCallbackReceiver
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{
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// cache the referenced Game Object if we find one for performance
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private GameObject cachedReference;
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private bool isCacheSet;
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// store our GUID in a form that Unity can save
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[SerializeField]
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private byte[] serializedGuid;
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private System.Guid guid;
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#if UNITY_EDITOR
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// decorate with some extra info in Editor so we can inform a user of what that GUID means
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[SerializeField]
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private string cachedName;
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[SerializeField]
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private SceneAsset cachedScene;
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#endif
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// Set up events to let users register to cleanup their own cached references on destroy or to cache off values
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public event Action<GameObject> OnGuidAdded = delegate (GameObject go) { };
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public event Action OnGuidRemoved = delegate() { };
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// create concrete delegates to avoid boxing.
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// When called 10,000 times, boxing would allocate ~1MB of GC Memory
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private Action<GameObject> addDelegate;
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private Action removeDelegate;
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// optimized accessor, and ideally the only code you ever call on this class
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public GameObject gameObject
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{
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get
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{
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if( isCacheSet )
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{
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return cachedReference;
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}
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cachedReference = GuidManager.ResolveGuid( guid, addDelegate, removeDelegate );
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isCacheSet = true;
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return cachedReference;
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}
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private set {}
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}
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public GuidReference() { }
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public GuidReference(GuidComponent target)
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{
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guid = target.GetGuid();
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}
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private void GuidAdded(GameObject go)
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{
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cachedReference = go;
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OnGuidAdded(go);
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}
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private void GuidRemoved()
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{
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cachedReference = null;
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isCacheSet = false;
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OnGuidRemoved();
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}
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//convert system guid to a format unity likes to work with
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public void OnBeforeSerialize()
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{
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serializedGuid = guid.ToByteArray();
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}
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// convert from byte array to system guid and reset state
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public void OnAfterDeserialize()
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{
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cachedReference = null;
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isCacheSet = false;
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if (serializedGuid == null || serializedGuid.Length != 16)
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{
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serializedGuid = new byte[16];
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}
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guid = new System.Guid(serializedGuid);
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addDelegate = GuidAdded;
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removeDelegate = GuidRemoved;
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}
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}
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