d4r: official NVIDIA DLSS on AMD GPUs under Linux and Proton

packaging/optiscaler.settings

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+# OptiScaler.ini values the d4r release sets (Section.Key=Value); everything else keeps OptiScaler's
+# default. scripts/package_release.sh applies them to the OptiScaler.ini of the bundled release.
+# DLSS as the DX12 upscaler, loaded from the d4r folder (OptiScaler looks for nvngx.dll there)
+Upscalers.Dx12Upscaler=dlss
+DLSS.Enabled=true
+Libraries.OptiDllPath=d4r
+# The game's DLSS calls reach OptiScaler; d4r's own load of NVIDIA's NGX core is left alone
+Inputs.EnableDlssInputs=true
+Hooks.HookOriginalNvngxOnly=true
+# Proton's NVAPI (with PROTON_FORCE_NVAPI=1) serves the game; no fakenvapi
+NvApi.OverrideNvapiDll=false
+# The game sees an NVIDIA GPU through DXGI, so it offers DLSS
+Spoofing.Dxgi=true
+FrameGen.Enabled=false
+FrameGen.FGInput=nofg
+FrameGen.FGOutput=nofg