Add Spaghetti Kart to the Steam Deck.

nix/steam_deck/configuration/flake.lock

@@ -1,12 +1,15 @@
 {
   "nodes": {
     "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
       "locked": {
-        "lastModified": 1659877975,
+        "lastModified": 1731533236,
-        "narHash": "sha256-zllb8aq3YO3h8B/U0/J1WBgAL8EX5yWf5pMj3G0NAmc=",
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "c0e246b9b83f637f4681389ecabcb2681b4f3af0",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
         "type": "github"
       },
       "original": {
@@ -22,11 +25,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1739314552,
+        "lastModified": 1757698511,
-        "narHash": "sha256-ggVf2BclyIW3jexc/uvgsgJH4e2cuG6Nyg54NeXgbFI=",
+        "narHash": "sha256-UqHHGydF/q3jfYXCpvYLA0TWtvByOp1NwOKCUjhYmPs=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "83bd3a26ac0526ae04fa74df46738bb44b89dcdd",
+        "rev": "a3fcc92180c7462082cd849498369591dfb20855",
         "type": "github"
       },
       "original": {
@@ -58,11 +61,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1713543440,
+        "lastModified": 1752054764,
-        "narHash": "sha256-lnzZQYG0+EXl/6NkGpyIz+FEOc/DSEG57AP1VsdeNrM=",
+        "narHash": "sha256-Ob/HuUhANoDs+nvYqyTKrkcPXf4ZgXoqMTQoCK0RFgQ=",
         "owner": "nix-community",
         "repo": "nixGL",
-        "rev": "310f8e49a149e4c9ea52f1adf70cdc768ec53f8a",
+        "rev": "a8e1ce7d49a149ed70df676785b07f63288f53c5",
         "type": "github"
       },
       "original": {
@@ -73,11 +76,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1739138025,
+        "lastModified": 1757746433,
-        "narHash": "sha256-M4ilIfGxzbBZuURokv24aqJTbdjPA9K+DtKUzrJaES4=",
+        "narHash": "sha256-fEvTiU4s9lWgW7mYEU/1QUPirgkn+odUBTaindgiziY=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "b2243f41e860ac85c0b446eadc6930359b294e79",
+        "rev": "6d7ec06d6868ac6d94c371458fc2391ded9ff13d",
         "type": "github"
       },
       "original": {
@@ -94,6 +97,21 @@
         "nixgl": "nixgl",
         "nixpkgs": "nixpkgs"
       }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
     }
   },
   "root": "root",

nix/steam_deck/configuration/flake.nix

@@ -4,8 +4,10 @@
 
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
-    nixgl.url = "github:nix-community/nixGL";
+    nixgl = {
-    nixgl.inputs.nixpkgs.follows = "nixpkgs";
+      url = "github:nix-community/nixGL";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
     home-manager = {
       url = "github:nix-community/home-manager";
       inputs.nixpkgs.follows = "nixpkgs";
@@ -23,6 +25,7 @@
       ...
     }:
     let
+      forAllSystems = nixpkgs.lib.genAttrs nixpkgs.lib.systems.flakeExposed;
       system = "x86_64-linux";
       pkgs = import nixpkgs {
         inherit system;
@@ -31,7 +34,7 @@
     in
     # pkgs = nixpkgs.legacyPackages.${system};
     {
-      defaultPackage.${system} = home-manager.defaultPackage.${system};
+      defaultPackage.${system} = home-manager.packages.${system}.default;
       homeConfigurations."deck" = home-manager.lib.homeManagerConfiguration {
         inherit pkgs;
 

nix/steam_deck/configuration/home.nix

@@ -18,6 +18,7 @@
     ./roles/ryujinx
     ./roles/shipwright
     ./roles/sm64ex
+    ./roles/spaghettikart
     ./roles/steam_rom_manager
     ./roles/yuzu
     ./util/copy_files

nix/steam_deck/configuration/hosts/deck/default.nix

@@ -11,15 +11,16 @@
   config = {
     me.ares.enable = true;
     me.dolphin.enable = true;
-    me.duckstation.enable = true;
+    me.duckstation.enable = false;
     me.graphical = true;
     me.optimizations.enable = true;
     me.pcsx2.enable = true;
     me.rpcs3.enable = true;
     me.ryujinx.enable = true;
     me.ship2harkinian.enable = true;
-    me.shipwright.enable = true;
+    me.shipwright.enable = false;
     me.sm64ex.enable = true;
+    me.spaghettikart.enable = false;
     me.steam_rom_manager.enable = true; # Steam rom manager UI does not render. I think it wants to be in an AppImage.
     me.yuzu.enable = true;
   };

nix/steam_deck/configuration/roles/spaghettikart/default.nix

@@ -0,0 +1,88 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+let
+  steam_spaghettikart = pkgs.writeScriptBin "steam_Spaghettify" ''
+    export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:${pkgs.libglvnd}/lib"
+    exec ${pkgs.spaghettikart}/bin/Spaghettify "''${@}"
+  '';
+in
+{
+  imports = [ ];
+
+  options.me = {
+    spaghettikart.enable = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      example = true;
+      description = "Whether we want to install spaghettikart.";
+    };
+  };
+
+  config = lib.mkIf config.me.spaghettikart.enable (
+    lib.mkMerge [
+      {
+        allowedUnfree = [ "spaghettikart" ];
+      }
+      (lib.mkIf config.me.graphical {
+        home.packages = with pkgs; [
+          spaghettikart
+          steam_spaghettikart
+        ];
+
+        home.file.".local/share/spaghettikart/spaghettify.cfg.json" = {
+          source = ./files/spaghettify.cfg.json;
+        };
+
+        home.persistence."/home/deck/.persist" = {
+          files = [
+            ".local/share/spaghettikart/default.sav"
+            ".local/share/spaghettikart/mk64.o2r"
+          ];
+        };
+
+        nixpkgs.overlays = [
+          (
+            final: prev:
+            let
+              optimizeWithFlags =
+                pkg: flags:
+                pkg.overrideAttrs (old: {
+                  NIX_CFLAGS_COMPILE = [ (old.NIX_CFLAGS_COMPILE or "") ] ++ flags;
+                });
+              original_package =
+                if config.me.optimizations.enable then
+                  (optimizeWithFlags prev.spaghettikart [
+                    "-march=znver2"
+                    "-mtune=znver2"
+                  ])
+                else
+                  prev.spaghettikart;
+            in
+            {
+              spaghettikart = pkgs.buildEnv {
+                name = prev.spaghettikart.name;
+                paths = [
+                  (config.lib.nixGL.wrap original_package)
+                ];
+                extraOutputsToInstall = [
+                  "man"
+                  "doc"
+                  "info"
+                ];
+                # We have to use 555 instead of the normal 444 here because the .desktop file ends up inside $HOME on steam deck and desktop files must be either not in $HOME or must be executable, otherwise KDE Plasma refuses to execute them.
+                postBuild = ''
+                  chmod 0555 $out/share/applications/SpaghettiKart.desktop
+                '';
+              };
+            }
+          )
+        ];
+      })
+    ]
+  );
+}

nix/steam_deck/configuration/roles/spaghettikart/files/spaghettify.cfg.json

@@ -0,0 +1,14 @@
+{
+  "CVars": {
+    "gDisableLod": 1,
+    "gMSAAValue": 2,
+    "gShowSpaghettiVersion": 0,
+    "gSkipIntro": 1,
+    "gVsyncEnabled": 1
+  },
+  "Window": {
+    "Fullscreen": {
+      "Enabled": true
+    }
+  }
+}