MaterialPropertyBlock.SetConstantBuffer doesn't seem to work

Unity 2019.2.21f
I am rendering a bunch of meshes using

Graphics.DrawMeshInstanced

with a

Material

and a

MaterialPropertyBlock

.
If I use

SetConstantBuffer

on a

MaterialPropertyBlock

I get all zero values, however if I set it on the material directly it works. Is this some kind of limitation or is it broken?

 

@aleksandrk I don't really have the time to try for a while, so do you know what the implications of setting it on the material before each call to

Graphics.DrawMeshInstanced

would be?

 

Have you been able to fix the issue? I'm also rendering my custom meshes using instancing.

Here is my code:

Code (CSharp):

1. [StructLayout(LayoutKind.Sequential)]
2. private struct AnimationInfo
3. {
4.     public AnimationInfo(int frameCount, float frameDuration)
5.     {
6.         this.frameCount = frameCount;
7.         this.frameDuration = frameDuration;
8.     }
9.  
10.     public int frameCount;
11.     public float frameDuration;
12. }
13.  
14. ...
15.  
16. var animationInfoBuffer = new ComputeBuffer(
17.     1, UnsafeUtility.SizeOf<AnimationInfo>(),
18.     ComputeBufferType.Constant, ComputeBufferMode.Immutable
19. );
20. animationInfoBuffer.SetData(new[] { new AnimationInfo(frameCount, frameDuration) });
21. materialInfo.UnityMaterial.SetConstantBuffer(AnimationInfoID, animationInfoBuffer, 0, UnsafeUtility.SizeOf<AnimationInfo>());

Here is how it is defined in my shader

Code (CSharp):

1.  
2. CBUFFER_START(AnimationInfo)
3.     int frameCount;
4.     float frameDuration;
5. CBUFFER_END

Though, everything is zero. Setting those values through Material.SetFloat works

 

I've found out that

Code (CSharp):

1. materialInfo.UnityMaterial.HasConstantBuffer("AnimationInfo")

returns FALSE!!!

It is defined in my shader but Unity cannot find it.

 

@aleksandrk Currently, the project is setup for Android, though I'm running it in the Unity Editor.

 

I can create a project that reproduces this bug

 

Yes, it does return true.

 

The thing is that it doesn't find the constant buffer in the shader whatsoever.

Code (CSharp):

1.  
2. Debug.Log(materialInfo.UnityMaterial.HasConstantBuffer("AnimationInfo")); // Returns false
3. var animationInfoBuffer = new ComputeBuffer(
4.     1, UnsafeUtility.SizeOf<AnimationInfo>(),
5.     ComputeBufferType.Constant, ComputeBufferMode.Immutable
6. );
7. animationInfoBuffer.SetData(new[] { new AnimationInfo(frameCount, frameDuration) });
8. materialInfo.UnityMaterial.SetConstantBuffer("AnimationInfo", animationInfoBuffer, 0, UnsafeUtility.SizeOf<AnimationInfo>());
9.  
10. Debug.Log(SystemInfo.supportsSetConstantBuffer);    // Returns true

Code (CSharp):

1. CBUFFER_START(AnimationInfo)
2.       int frameCount;
3.       float frameDuration;
4. CBUFFER_END