From what I can tell, the recent work on SampleBias/SampleLevel did all of the work for us, we just need to take the same framework and include the case for the `sample_l` instruction.
Tested with some shaders from the native Linux version of Little Racers STREET.
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v9: tpf: For sample_l/sample_b, set lod swizzle to SCALAR.
vkd3d-shader/tpf: Add support for emitting sample_l instructions
vkd3d-shader/hlsl: Add support for SampleGrad() method
tests: Add a test for SampleGrad() method
https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/188