dan elksnitis 49d7985a85 [shaders] Add "compile argument" functionality for generic parameters consumed by compile backends, along with helper to set both a compile arg AND define for cases which require both. The purpose of this is to move towards enforcing that preprocessor defines should _only_ be used during the preprocessing phase itself; the subset of defines that are currently used only as arguments to the compile backends (or used as both actual preprocessor defines and backend arguments) should use this mechanism instead. This allows us to explicitly identify and hash such parameters to be included in a stable key based primarily on a hash of preprocessed/deadstripped source; without it we would need to hash all defines which will defeat most of the deduplication benefit of doing this. A subsequent change will deprecate the GetDefinitions function on the shader compilation environment to enforce that defines cannot be read by anything outside of core shader system functionality. ...

#rb Massimo.Tristano
#rb Laura.Hermanns
#preflight 64258c2e5e52099fe3d03625

[CL 24854110 by dan elksnitis in ue5-main branch]

2023-03-30 10:47:09 -04:00

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