Currently r8Unorm_srgb is required by virtual texture lightmap, and the Metal RHI simply forbids r8Unorm_srgb on Mac platform. Since the latest MacOS 11.0+ have the support of r8Unorm_srgb, we should make r8Unorm_srgb available in MacOS 11.0+ and have a better warning instead of crash in previous OS.

Steps to Reproduce

enable virtual texture lightmap and build light in Mac editor.

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ComponentUE - Rendering - RHI
Affects Versions4.26.2
Target Fix4.27
Fix Commit16074211
Main Commit16115357
Release Commit16074211
CreatedMar 4, 2021
ResolvedApr 21, 2021
UpdatedMay 11, 2021