【ECSLearn】 1 放在subscene里，GameObject不用ConvertToEntity脚本就能直接被调用 2 Share…

…d component Data 中如果有引用类型，需要实现Equals接口和GetHashCode接口

EntityComponentSystemSamples/ECSSamples/Assets/Advanced/ManagedComponents/SimpleMeshRenderingAuthoring.cs

@@ -3,6 +3,7 @@
 //       In a normal game project this ifdef is not required.
 
 #if !UNITY_DISABLE_MANAGED_COMPONENTS
+using System;
 using Unity.Entities;
 using UnityEngine;
 using Unity.Transforms;
@@ -15,6 +16,7 @@ class SimpleMeshRenderingAuthoring : MonoBehaviour, IConvertGameObjectToEntity
 
     public void Convert(Entity entity, EntityManager dstManager, GameObjectConversionSystem conversionSystem)
     {
+        //放在subscene里，GameObject不用ConvertToEntity脚本就能直接被调用
         // Assets in subscenes can either be created during conversion and embedded in the scene
         var material = new Material(Shader.Find("Standard"));
         material.color = Color;
@@ -25,6 +27,12 @@ public void Convert(Entity entity, EntityManager dstManager, GameObjectConversio
             Mesh = Mesh,
             Material = material,
         });
+
+        dstManager.AddSharedComponentData(entity, new SimpleMeshRendererEx
+        {
+            Mesh = Mesh,
+            Material = material,
+        });
     }
 }
 
@@ -34,6 +42,29 @@ public class SimpleMeshRenderer : IComponentData
     public Material Material;
 }
 
+//为什么不用Shared component Data
+//Shared component Data 中如果有引用类型，需要实现Equals接口和GetHashCode接口
+public struct SimpleMeshRendererEx : ISharedComponentData, IEquatable<SimpleMeshRendererEx>
+{
+    public Mesh     Mesh;
+    public Material Material;
+    public bool Equals(SimpleMeshRendererEx other)
+    {
+        if (Material == null)
+            return false;
+        int otherId = other.Material.GetInstanceID();
+        int id = this.Material.GetInstanceID();
+        return otherId == id;
+    }
+
+    public override int GetHashCode()
+    {
+        if (Material == null)
+            return 0;
+        return Material.GetInstanceID();
+    }
+}
+
 [ExecuteAlways]
 [AlwaysUpdateSystem]
 [UpdateInGroup(typeof(PresentationSystemGroup))]