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home/config/niri/env.kdl

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+environment {
+    // =========================================================================
+    // 1. NVIDIA & GBM BACKEND
+    // =========================================================================
+    // Forces the Generic Buffer Manager (GBM) to use the NVIDIA DRM driver.
+    GBM_BACKEND "nvidia-drm"
+
+    // Forces OpenGL/GLX applications to use the NVIDIA proprietary driver.
+    __GLX_VENDOR_LIBRARY_NAME "nvidia"
+
+    // =========================================================================
+    // 2. HARDWARE VIDEO ACCELERATION
+    // =========================================================================
+    // Tells VA-API to use the NVIDIA driver for hardware-accelerated video.
+    LIBVA_DRIVER_NAME "nvidia"
+
+    // REQUIRED if you use 'nvidia-vaapi-driver' for Firefox/Chromium video decoding.
+    NVD_BACKEND "direct"
+
+    // =========================================================================
+    // 3. VARIABLE REFRESH RATE (G-SYNC / VRR)
+    // =========================================================================
+    // Enables G-Sync / Adaptive Sync for capable monitors.
+    __GL_GSYNC_ALLOWED "1"
+
+    // Controls VRR. Note: If you experience desktop flickering, change this to "0".
+    __GL_VRR_ALLOWED "1"
+
+    // =========================================================================
+    // 4. TOOLKIT BACKENDS (Forces apps to run natively on Wayland)
+    // =========================================================================
+    // GTK: Try Wayland first, fallback to X11 if necessary.
+    GDK_BACKEND "wayland,x11,*"
+
+    // Qt: Use Wayland, fallback to X11.
+    QT_QPA_PLATFORM "wayland;xcb"
+
+    // Prevents Qt from drawing its own window borders/decorations.
+    QT_WAYLAND_DISABLE_WINDOWDECORATION "1"
+
+    // SDL: Forces games using modern SDL2/SDL3 to run natively on Wayland.
+    SDL_VIDEODRIVER "wayland"
+
+    // Clutter: Force Wayland backend.
+    CLUTTER_BACKEND "wayland"
+
+    // Firefox: Force native Wayland rendering (massively improves scrolling smoothness).
+    MOZ_ENABLE_WAYLAND "1"
+
+    // Electron/Chromium: Automatically flags apps (VS Code, Discord, Obsidian) to use Wayland.
+    ELECTRON_OZONE_PLATFORM_HINT "auto"
+
+    // =========================================================================
+    // 5. DESKTOP SESSION IDENTIFICATION
+    // =========================================================================
+    // Helps xdg-desktop-portal and styling tools recognize your environment.
+    XDG_SESSION_TYPE "wayland"
+    XDG_CURRENT_DESKTOP "niri"
+    XDG_SESSION_DESKTOP "niri"
+}