At the moment an attempt to enable shadowmaps on macOS causes a fatal error because of shader compilation failure.
The problem is missing handling of array's length() function in SPIRV-Cross and MoltenVK.
Shadowmaps are the last major unsupported feature in Vulkan renderer on macOS.
I replaced the missing functionality with node count passed as uniform in this PR.
Shadowmap shader issue with Molten
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Re: Shadowmap shader issue with Molten
PR looks good to me - feel free to merge it.