BlobArray error when accesses are done via a variable ?

Hi all !

When I access to a BlobArray in a for loop the result seems always wrong.

I wrote a simple test with a blobarray { 0,1,2 } and the first blobarray[0] return 8.

Anyone meets that before ?

I did bug report (1186219) but if you have a workaround because I'm block for now because of this :/

Spoiler

Code (CSharp):

1. using System;
2. using System.Collections;
3. using System.Collections.Generic;
4. using NUnit.Framework;
5. using Unity.Collections;
6. using Unity.Entities;
7. using Unity.Jobs;
8. using UnityEngine;
9.  
10. namespace MyNamespace
11. {
12. public struct blolData
13. {
14.     public int valueInt;
15.     public RenderMode renderMode;
16.     public BlobArray<int> MyArray;
17. }
18.  
19.     public class Test
20.     {
21.         [Test]
22.         public void MyTest()
23.         {
24.             BlobAssetReference<blolData> blob;
25.  
26.             using (var builder = new BlobBuilder(Allocator.Temp))
27.             {
28.                 ref var root = ref builder.ConstructRoot<blolData>();
29.  
30.                 var targetBlobArray = builder.Allocate(ref root.MyArray, 3);
31.  
32.                 for (var i = 0; i < targetBlobArray.Length; i++)
33.                     targetBlobArray[i] = i;
34.  
35.                 root.renderMode       = RenderMode.ScreenSpaceOverlay;
36.                 root.valueInt= 789;
37.  
38.                 blob = builder.CreateBlobAssetReference<blolData>(Allocator.TempJob);
39.             }
40.  
41.             new DebugJob {blob = blob}.Schedule().Complete();
42.         }
43.  
44.         public struct DebugJob : IJob
45.         {
46.             /// <inheritdoc />
47.             public void Execute()
48.             {
49.                 var array = blob.Value.MyArray;
50.                 for (int i = 0; i < array.Length; i++)
51.                 {
52.                     Assert.AreEqual(i , array[i]);
53.                 }
54.             }
55.  
56.             public BlobAssetReference<blolData> blob;
57.         }
58.  
59.     }
60. }

 

QA already confirms the bug, nice

https://issuetracker.unity3d.com/issues/entities-blobarray-access-returns-incorrect-value

 

After watching this video, errors came from missing ref when I call my BlobArray

 

Hmm that's one big nasty gotcha. Scary thing is I think I've been using it without the refs, and my test suites did not catch anything.

 

Strangely for me if I access it with constant value ( myArray[0]n myArray[1] ) all work fine, maybe for that ?

 

As mentioned in the talk from yesterday, Unity is planning on making this a compile error