Add VRChat and GitHub packages to Unity project

Assets/Udon/Serialization/OdinSerializer/Unity Integration/UnityReferenceResolver.cs

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+//-----------------------------------------------------------------------
+// <copyright file="UnityReferenceResolver.cs" company="Sirenix IVS">
+// Copyright (c) 2018 Sirenix IVS
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace VRC.Udon.Serialization.OdinSerializer
+{
+    using System.Collections.Generic;
+    using Utilities;
+
+    /// <summary>
+    /// Resolves external index references to Unity objects.
+    /// </summary>
+    /// <seealso cref="IExternalIndexReferenceResolver" />
+    /// <seealso cref="ICacheNotificationReceiver" />
+    public sealed class UnityReferenceResolver : IExternalIndexReferenceResolver, ICacheNotificationReceiver
+    {
+        private Dictionary<UnityEngine.Object, int> referenceIndexMapping = new Dictionary<UnityEngine.Object, int>(32, ReferenceEqualityComparer<UnityEngine.Object>.Default);
+        private List<UnityEngine.Object> referencedUnityObjects;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="UnityReferenceResolver"/> class.
+        /// </summary>
+        public UnityReferenceResolver()
+        {
+            this.referencedUnityObjects = new List<UnityEngine.Object>();
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="UnityReferenceResolver"/> class with a list of Unity objects.
+        /// </summary>
+        /// <param name="referencedUnityObjects">The referenced Unity objects.</param>
+        public UnityReferenceResolver(List<UnityEngine.Object> referencedUnityObjects)
+        {
+            this.SetReferencedUnityObjects(referencedUnityObjects);
+        }
+
+        /// <summary>
+        /// Gets the currently referenced Unity objects.
+        /// </summary>
+        /// <returns>A list of the currently referenced Unity objects.</returns>
+        public List<UnityEngine.Object> GetReferencedUnityObjects()
+        {
+            return this.referencedUnityObjects;
+        }
+
+        /// <summary>
+        /// Sets the referenced Unity objects of the resolver to a given list, or a new list if the value is null.
+        /// </summary>
+        /// <param name="referencedUnityObjects">The referenced Unity objects to set, or null if a new list is required.</param>
+        public void SetReferencedUnityObjects(List<UnityEngine.Object> referencedUnityObjects)
+        {
+            if (referencedUnityObjects == null)
+            {
+                referencedUnityObjects = new List<UnityEngine.Object>();
+            }
+
+            this.referencedUnityObjects = referencedUnityObjects;
+            this.referenceIndexMapping.Clear();
+
+            for (int i = 0; i < this.referencedUnityObjects.Count; i++)
+            {
+                if (object.ReferenceEquals(this.referencedUnityObjects[i], null) == false)
+                {
+                    if (!this.referenceIndexMapping.ContainsKey(this.referencedUnityObjects[i]))
+                    {
+                        this.referenceIndexMapping.Add(this.referencedUnityObjects[i], i);
+                    }
+                }
+            }
+        }
+
+        /// <summary>
+        /// Determines whether the specified value can be referenced externally via this resolver.
+        /// </summary>
+        /// <param name="value">The value to reference.</param>
+        /// <param name="index">The index of the resolved value, if it can be referenced.</param>
+        /// <returns>
+        ///   <c>true</c> if the reference can be resolved, otherwise <c>false</c>.
+        /// </returns>
+        public bool CanReference(object value, out int index)
+        {
+            if (this.referencedUnityObjects == null)
+            {
+                this.referencedUnityObjects = new List<UnityEngine.Object>(32);
+            }
+
+            var obj = value as UnityEngine.Object;
+
+            if (object.ReferenceEquals(null, obj) == false)
+            {
+                if (this.referenceIndexMapping.TryGetValue(obj, out index) == false)
+                {
+                    index = this.referencedUnityObjects.Count;
+                    this.referenceIndexMapping.Add(obj, index);
+                    this.referencedUnityObjects.Add(obj);
+                }
+
+                return true;
+            }
+
+            index = -1;
+            return false;
+        }
+
+        /// <summary>
+        /// Tries to resolve the given reference index to a reference value.
+        /// </summary>
+        /// <param name="index">The index to resolve.</param>
+        /// <param name="value">The resolved value.</param>
+        /// <returns>
+        ///   <c>true</c> if the index could be resolved to a value, otherwise <c>false</c>.
+        /// </returns>
+        public bool TryResolveReference(int index, out object value)
+        {
+            if (this.referencedUnityObjects == null || index < 0 || index >= this.referencedUnityObjects.Count)
+            {
+                // Sometimes something has destroyed the list of references in between serialization and deserialization
+                // (Unity prefab instances are especially bad at preserving such data), and in these cases we still don't
+                // want the system to fall back to a formatter, so we give out a null value.
+                value = null;
+                return true;
+            }
+
+            value = this.referencedUnityObjects[index];
+            return true;
+        }
+
+        /// <summary>
+        /// Resets this instance.
+        /// </summary>
+        public void Reset()
+        {
+            this.referencedUnityObjects = null;
+            this.referenceIndexMapping.Clear();
+        }
+
+        void ICacheNotificationReceiver.OnFreed()
+        {
+            this.Reset();
+        }
+
+        void ICacheNotificationReceiver.OnClaimed()
+        {
+        }
+    }
+}