From 88285e396fb49e9bce816510329c06a70123702f Mon Sep 17 00:00:00 2001
From: Sean Kovacs <kovacsmillio@gmail.com>
Date: Mon, 15 Dec 2025 14:36:26 -0500
Subject: [PATCH] alien: add gamescope

---
 system/hosts/alien/default.nix |  8 ++++++++
 system/hosts/alien/gs.sh       | 27 +++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)
 create mode 100644 system/hosts/alien/gs.sh

diff --git a/system/hosts/alien/default.nix b/system/hosts/alien/default.nix
index 74bcbd8..b8d3d2a 100644
--- a/system/hosts/alien/default.nix
+++ b/system/hosts/alien/default.nix
@@ -47,6 +47,14 @@
     };
     defaultSession = "niri";
   };
+
+  environment = {
+    systemPackages = [ pkgs.mangohud ];
+    loginShellInit = ''
+      [[ "$(tty)" = "/dev/tty1" ]] && ./gs.sh
+    '';
+  };
+
   security.sudo.wheelNeedsPassword = true;
 
   hardware.nvidia = {
diff --git a/system/hosts/alien/gs.sh b/system/hosts/alien/gs.sh
new file mode 100644
index 0000000..40cd18b
--- /dev/null
+++ b/system/hosts/alien/gs.sh
@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+set -xeuo pipefail
+
+gamescopeArgs=(
+    --adaptive-sync # VRR support
+    --hdr-enabled
+    --mangoapp # performance overlay
+    --rt
+    --steam
+)
+steamArgs=(
+    -pipewire-dmabuf
+    -tenfoot
+)
+mangoConfig=(
+    cpu_temp
+    gpu_temp
+    ram
+    vram
+)
+mangoVars=(
+    MANGOHUD=1
+    MANGOHUD_CONFIG="$(IFS=,; echo "${mangoConfig[*]}")"
+)
+
+export "${mangoVars[@]}"
+exec gamescope "${gamescopeArgs[@]}" -- steam "${steamArgs[@]}"