yarn: FH5 OptiScaler FSR 4 + VKD3D upload-hvv workaround
Drops OptiScaler v0.9.1 + a FH5-tuned OptiScaler.ini into the FH5 install dir to unlock FSR 4 INT8 on this RDNA 3 (Navi 32) box. OptiScaler intercepts FH5's DLSS/XeSS calls and reroutes them through the bundled FFX SDK. Per the OptiScaler FH5 wiki page: rename OptiScaler.dll to dxgi.dll, set Dxgi=false, DlssReactiveMaskBias=0.65, and Fsr4Update=true for the INT8 RDNA 3 path. Sets Steam launch options PROTON_FSR4_UPGRADE=1 and DXIL_SPIRV_CONFIG=wmma_rdna3_workaround on fh5-optiscaler (the FSR 4 wiki documents both as required for RDNA 3 on Linux). fh5-vkd3d-no-hvv is its own mod (no files, just one launchOptions entry for VKD3D_CONFIG=no_upload_hvv) so the upload-hvv workaround can be removed when a future Proton release fixes the underlying issue without disturbing the OptiScaler config. Extends the intro skip stub to cover the hires variant of the T10/Microsoft Studios splash; the engine picks SD or hires based on the installed asset profile, so stub both per PCGamingWiki.
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@@ -83,21 +83,114 @@
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# PS5 DualSense adaptive triggers in Forza Horizon 4 / 5.
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services.forzaTrigger.enable = true;
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# Skip the 40 MB T10/Microsoft Studios intro video on startup.
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# The module discovers FH5's install path from Steam's library metadata
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# and replaces the BK2 file with a 0-byte stub. Re-applies daily via
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# systemd timer so Steam verify/updates don't silently undo it.
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# Declarative game-file mods on top of Steam.
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#
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# Two copies live in the install: media/UI/Videos/T10_MS_Combined.bk2
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# (SD) and .../hires/T10_MS_Combined.bk2 (hires). The engine picks one
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# based on the installed asset profile, so we stub both for guaranteed
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# coverage. PCGamingWiki documents both paths under "Skip intro video".
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services.gameMods = {
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enable = true;
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mods."fh5-no-intro" = {
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steamAppId = 1551360;
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files."media/UI/Videos/T10_MS_Combined.bk2".empty = true;
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files."media/UI/Videos/hires/T10_MS_Combined.bk2".empty = true;
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# fh5-no-intro: stub the 40 MB T10/Microsoft Studios cold-start splash.
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# Two copies live in the install (SD + hires); engine picks one based on
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# the installed asset profile, so stub both. PCGamingWiki documents both
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# paths under "Skip intro video".
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#
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# fh5-optiscaler: drop OptiScaler v0.9.1 + a FH5-tuned OptiScaler.ini into
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# the install dir to enable FSR 4 INT8 on this RDNA 3 Navi 32 box.
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# OptiScaler intercepts FH5's DLSS/XeSS calls and reroutes them through
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# the bundled FFX SDK. Settings flipped from upstream defaults:
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# Fsr4Update auto -> true # FSR 4 path required for INT8 RDNA 3
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# Dxgi auto -> false # FH5 wiki: required for 0.9
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# DlssReactiveMaskBias auto -> 0.65 # FH5 wiki: fixes flickering lights, reduces car ghosting
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#
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# Required one-time per-game setup in Steam (Proton picker is not
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# declarable from NixOS; launch options are written declaratively below):
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# 1. Properties -> Compatibility: force "GE-Proton" (proton-ge-bin is
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# already in extraCompatPackages; pick the latest installed).
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# Steam must be closed when the launch options write happens, or
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# Steam will overwrite our localconfig.vdf edit on shutdown.
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# 2. In-game: switch the Upscaling option from FSR 2.2 to DLSS or XeSS
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# (FSR 2 inputs aren't intercepted). Press Insert to open the Opti
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# overlay and set the FFX upscaler to FSR 4.
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#
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# Caveats:
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# - OptiScaler.ini is dropped with mode = "init" so in-game overlay edits
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# persist. The awk-patched template below is only written on first apply
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# (or after manual deletion). To push a new default into an existing
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# install: rm OptiScaler.ini in the FH5 dir, then `systemctl start
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# game-mods`. The DLLs and other static assets stay mode = "create" so
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# they're updated on every OptiScaler version bump.
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# - OptiScaler's installation page warns against use with online games.
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# FH5 has no kernel-mode anti-cheat but Playground does server-side
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# telemetry. Use at your own risk.
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#
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# fh5-vkd3d-no-hvv: append `VKD3D_CONFIG=no_upload_hvv` to FH5's launch
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# options. Disables vkd3d-proton's host-visible VRAM upload heap, which
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# works around a Proton stutter/crash on this box. Kept as its own mod
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# (no files, just env) so the workaround can be removed independently of
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# OptiScaler when a future Proton release fixes the underlying issue.
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services.gameMods =
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let
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optiPkg = pkgs.optiscaler;
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# OptiScaler.ini ships with CRLF line endings, so we use awk with explicit
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# RS/ORS to keep the rewrites line-ending agnostic. The regex is matched
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# against the CR-stripped record, the original CRLF is restored on output.
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optiIni = pkgs.runCommand "OptiScaler-fh5.ini" { } ''
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awk -v RS='\r\n' -v ORS='\r\n' '
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/^Fsr4Update=auto$/ { print "Fsr4Update=true"; next }
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/^Dxgi=auto$/ { print "Dxgi=false"; next }
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/^DlssReactiveMaskBias=auto$/ { print "DlssReactiveMaskBias=0.65"; next }
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{ print }
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' ${optiPkg}/OptiScaler.ini > $out
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'';
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fromOpti = relpath: {
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source = "${optiPkg}/${relpath}";
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mode = "create";
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};
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in
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{
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enable = true;
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mods."fh5-no-intro" = {
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steamAppId = 1551360;
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files."media/UI/Videos/T10_MS_Combined.bk2".empty = true;
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files."media/UI/Videos/hires/T10_MS_Combined.bk2".empty = true;
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};
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mods."fh5-optiscaler" = {
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steamAppId = 1551360;
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# RDNA 3 (Navi 32) FSR 4 path on Linux:
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# PROTON_FSR4_UPGRADE=1 opts FH5 into Proton's FSR 4 upgrade.
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# DXIL_SPIRV_CONFIG=wmma_rdna3_... fixes broken visuals on RDNA 3 per
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# the OptiScaler FSR4 wiki.
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# Other FH5-targeting mods (e.g. fh5-vkd3d-no-hvv) append their own
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# entries to this list; the module joins them and adds %command%.
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launchOptions = [
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"PROTON_FSR4_UPGRADE=1"
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"DXIL_SPIRV_CONFIG=wmma_rdna3_workaround"
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];
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files = {
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# OptiScaler.dll is renamed to dxgi.dll so FH5's DLL search order
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# picks it up as the dxgi shim per the OptiScaler FH5 wiki page.
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"dxgi.dll" = fromOpti "OptiScaler.dll";
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"OptiScaler.ini" = {
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source = optiIni;
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# init: drop the patched template once, then leave it alone so
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# the in-game overlay can persist user tweaks.
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mode = "init";
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};
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}
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// lib.genAttrs [
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"D3D12_Optiscaler/D3D12Core.dll"
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"amd_fidelityfx_dx12.dll"
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"amd_fidelityfx_framegeneration_dx12.dll"
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"amd_fidelityfx_upscaler_dx12.dll"
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"amd_fidelityfx_vk.dll"
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"dlssg_to_fsr3_amd_is_better.dll"
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"fakenvapi.dll"
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"fakenvapi.ini"
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"libxell.dll"
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"libxess.dll"
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"libxess_dx11.dll"
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"libxess_fg.dll"
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] fromOpti;
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};
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mods."fh5-vkd3d-no-hvv" = {
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steamAppId = 1551360;
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launchOptions = [ "VKD3D_CONFIG=no_upload_hvv" ];
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};
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};
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};
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}
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