From 1963db67145d38469cf09f2464f0cee9bb17afc0 Mon Sep 17 00:00:00 2001
From: Chris Toph <toph@ryot.foo>
Date: Mon, 31 Mar 2025 12:19:32 -0400
Subject: [PATCH] Add nix-gaming input for pulse low latency, fixup gamescope
 and gamemode

---
 flake.nix                                    |  7 +++++
 home/toph/common/optional/gaming/default.nix | 27 ++++++++++++++++----
 hosts/common/optional/audio.nix              | 10 ++++++--
 hosts/common/optional/gaming.nix             | 13 ++++++++--
 hosts/users/default.nix                      |  3 ++-
 5 files changed, 50 insertions(+), 10 deletions(-)

diff --git a/flake.nix b/flake.nix
index 3832262..c6b190a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -67,6 +67,13 @@
 
     ## Misc Packages ##
 
+    nix-gaming = {
+      url = "github:fufexan/nix-gaming";
+      inputs = {
+        nixpkgs.follows = "nixpkgs";
+      };
+    };
+
     # nixcord.url = "github:kaylorben/nixcord";
     # spicetify-nix = {
     #   url = "github:Gerg-L/spicetify-nix";
diff --git a/home/toph/common/optional/gaming/default.nix b/home/toph/common/optional/gaming/default.nix
index 5dae89b..efb150d 100644
--- a/home/toph/common/optional/gaming/default.nix
+++ b/home/toph/common/optional/gaming/default.nix
@@ -8,32 +8,41 @@
 }:
 
 let
-  # monitor = lib.head (lib.filter (m: m.primary) config.monitors);
+  monitor = lib.head (lib.filter (m: m.primary) config.monitors);
 
   steam-session =
     let
       gamescope = lib.concatStringsSep " " [
         (lib.getExe pkgs.gamescope)
-        # "--output-width ${toString monitor.width}"
-        # "--output-height ${toString monitor.height}"
-        # "--framerate-limit ${toString monitor.refreshRate}"
-        # "--prefer-output ${monitor.name}"
+        "--rt"
+        "--output-width ${toString monitor.width}"
+        "--output-height ${toString monitor.height}"
+        "--framerate-limit ${toString monitor.refreshRate}"
+        "--prefer-output ${monitor.name}"
         "--adaptive-sync"
         "--expose-wayland"
+        "--backend wayland"
         "--steam"
         # "--hdr-enabled"
       ];
       steam = lib.concatStringsSep " " [
         "steam"
         #"steam://open/bigpicture"
+        "-forcedesktopscaling ${toString monitor.scale}"
+        "-nofriendsui"
+        "-noschatui"
       ];
     in
     pkgs.writeTextDir "share/applications/steam-session.desktop" ''
       [Desktop Entry]
       Name=Steam Session
+      Comment=Steam with Gamescope
       Exec=${gamescope} -- ${steam}
       Icon=steam
       Type=Application
+      Categories=Network;FileTransfer;Game;
+      MimeType=x-scheme-handler/steam;x-scheme-handler/steamlink;
+      PrefersNonDefaultGPU = true;
     '';
 in
 {
@@ -41,5 +50,13 @@ in
     steam-session
     prismlauncher
     # modrinth-app
+    (lutris.override {
+      extraLibraries = pkgs: [
+        # List library dependencies here
+      ];
+      extraPkgs = pkgs: [
+        # List package dependencies here
+      ];
+    })
   ];
 }
diff --git a/hosts/common/optional/audio.nix b/hosts/common/optional/audio.nix
index 5c306da..5e4ab5e 100644
--- a/hosts/common/optional/audio.nix
+++ b/hosts/common/optional/audio.nix
@@ -1,15 +1,20 @@
-{ pkgs, ... }:
+{ pkgs, inputs, ... }:
 {
-  # sound.enable = true; #deprecated in 24.11 TODO remove this line when 24.11 release
+  imports = [
+    inputs.nix-gaming.nixosModules.pipewireLowLatency
+  ];
+
   services.pulseaudio.enable = false;
   security.rtkit.enable = true;
   services.pipewire = {
     enable = true;
+
     alsa.enable = true;
     alsa.support32Bit = true;
     pulse.enable = true;
     wireplumber.enable = true;
     jack.enable = true;
+    lowLatency.enable = true;
 
     # use the example session manager (no others are packaged yet so this is enabled by default,
     # no need to redefine it in your config for now)
@@ -19,6 +24,7 @@
   environment.systemPackages = builtins.attrValues {
     inherit (pkgs)
       playerctl # cli utility and lib for controlling media players
+      pavucontrol
       # pamixer # cli pulseaudio sound mixer
       ;
   };
diff --git a/hosts/common/optional/gaming.nix b/hosts/common/optional/gaming.nix
index 8bd8354..947e28c 100644
--- a/hosts/common/optional/gaming.nix
+++ b/hosts/common/optional/gaming.nix
@@ -1,4 +1,9 @@
-{ pkgs, ... }:
+{
+  pkgs,
+  lib,
+  config,
+  ...
+}:
 {
   hardware.xone.enable = true; # xbox controller
 
@@ -9,6 +14,7 @@
         enable = true;
         package = pkgs.protontricks;
       };
+
       package = pkgs.steam.override {
         extraPkgs =
           pkgs:
@@ -31,10 +37,12 @@
               libkrb5
               keyutils
               gperftools
+              gamemode
               ;
           });
       };
       extraCompatPackages = [ pkgs.unstable.proton-ge-bin ];
+      gamescopeSession.enable = true;
     };
     #gamescope launch args set dynamically in home/<user>/common/optional/gaming
     gamescope = {
@@ -48,8 +56,9 @@
       settings = {
         #see gamemode man page for settings info
         general = {
-          softrealtime = "on";
+          softrealtime = "auto";
           inhibit_screensaver = 1;
+          renice = 15;
         };
         gpu = {
           apply_gpu_optimisations = "accept-responsibility";
diff --git a/hosts/users/default.nix b/hosts/users/default.nix
index fb8d14b..377effc 100644
--- a/hosts/users/default.nix
+++ b/hosts/users/default.nix
@@ -32,10 +32,11 @@ in
       "wheel"
       (ifTheyExist [
         "audio"
-        "video"
         "docker"
+        "gamemode"
         "git"
         "networkmanager"
+        "video"
       ])
     ];
   };