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Packages/jillejr.newtonsoft.json-for-unity.converters/UnityConverters/Math/Matrix4x4Converter.cs

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+#region License
+// The MIT License (MIT)
+//
+// Copyright (c) 2020 Wanzyee Studio
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+#endregion
+
+using System.Collections.Generic;
+using System.Linq;
+using Newtonsoft.Json.UnityConverters.Helpers;
+using UnityEngine;
+
+namespace Newtonsoft.Json.UnityConverters.Math
+{
+    /// <summary>
+    /// Custom Newtonsoft.Json converter <see cref="JsonConverter"/> for the Unity Matrix4x4 type <see cref="Matrix4x4"/>.
+    /// </summary>
+    public class Matrix4x4Converter : PartialConverter<Matrix4x4>
+    {
+        // https://github.com/Unity-Technologies/UnityCsReference/blob/2019.2/Runtime/Export/Math/Matrix4x4.cs#L21-L29
+        private static readonly string[] _names = GetMemberNames();
+        private static readonly Dictionary<string, int> _namesToIndex = GetNamesToIndex(_names);
+
+        /// <summary>
+        /// Get the property names include from <c>m00</c> to <c>m33</c>.
+        /// </summary>
+        /// <returns>The property names.</returns>
+        private static string[] GetMemberNames()
+        {
+            string[] indexes = new[] { "0", "1", "2", "3" };
+            return indexes.SelectMany((row) => indexes.Select((column) => "m" + column + row)).ToArray();
+        }
+
+        // Reusing the same strings here instead of creating new ones. Tiny bit lower memory footprint
+        private static Dictionary<string, int> GetNamesToIndex(string[] names)
+        {
+            var dict = new Dictionary<string, int>();
+            for (int i = 0; i < names.Length; i++)
+            {
+                dict[names[i]] = i;
+            }
+            return dict;
+        }
+
+        protected override void ReadValue(ref Matrix4x4 value, string name, JsonReader reader, JsonSerializer serializer)
+        {
+            if (_namesToIndex.TryGetValue(name, out var index))
+            {
+                value[index] = reader.ReadAsFloat() ?? 0;
+            }
+        }
+
+        protected override void WriteJsonProperties(JsonWriter writer, Matrix4x4 value, JsonSerializer serializer)
+        {
+            for (int i = 0; i < _names.Length; i++)
+            {
+                writer.WritePropertyName(_names[i]);
+                writer.WriteValue(value[i]);
+            }
+        }
+    }
+}