Batman:Arkham Knight sample mask and multisampling behavior problem

[viktoriiapalianytsia]

I have encountered a problem with Batman's cloak in the game Batman:Arkham Knight. It is always flickering and it looks like it is caused by DXVK.

Firstly the Mesa issue was created: 6078. You can find most of information in this issue, but in general it appears that sample mask out behavior with multisampling is a problem here. It looks like DXVK is expecting GL behavior. It expects sample mask to be disabled for single sampled target, while VK behavior is different - per the Vulkan spec, shader writes to the sample mask work regardless of whether multisample is enabled.

Trace BatmanAK

[doitsujin]

Is the D3D behaviour documented anywhere?

We don't really "expect" anything, we just translate the shader as normal since I'm not aware that this is a special case in some APIs.

[Blisto91]

@viktoriiapalianytsia i see this have been worked around in the driver but if you are still around i think the devs would like some more info about the original issue if possible

[Blisto91]

@viktoriiapalianytsia Friendly double ping.

[viktoriiapalianytsia]

All the info I had about this misrendering is in the original issue. I can also provide the trace that was used while working with workaround in this link.