Feature Request: Support for Payload Access Qualifiers

[natevm]

With SM 6.6 and 6.7, DXR and HLSL supports "Payload access qualifiers" (PAQs) which allow users to specify if and where payload fields are read and written from / to.

More information here: https://microsoft.github.io/DirectX-Specs/d3d/Raytracing.html#payload-access-qualifiers

At the moment, Slang does not yet have this feature, which is causing me some migration pain when moving from HLSL / DXC to Slang.

Could we consider adding this feature?

[csyonghe]

This shouldn't be hard to add. Does SPIRV support this?

[natevm]

Asking around. I know that DXC supports them when targeting SPIRV, but I’m not sure if it has any effects on the actual IR itself.

[swoods-nv]

Moving out to Q2 because this isn't as urgent as other Q1 items

[bmillsNV]

Not a priority. Putting back on the backlog