added gs.sh

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[@]}"

packages/hyprland/config/rules.nix

@@ -51,6 +51,7 @@
 
       # Always full screen
       # "fullscreen, title:^(Steam Big Picture Mode)$"
+      "fullscreen, title:^(steam_app_.*)$"
 
       # Dialogs
       "float, title:(Select|Open)( a)? (File|Folder)(s)?"