make nvidia environment variables conditional

.config/hypr/source/environment_variables.conf

@@ -15,8 +15,11 @@ env = QT_QPA_PLATFORM,wayland;xcb   # Qt: Use Wayland if available, fall back to
 env = SDL_VIDEODRIVER,Wayland       # Run SDL2 applications on Wayland. Remove or set to x11 if games that provide older versions of SDL cause compatibility issues
 env = CLUTTER_BACKEND,wayland       #  Clutter applications to try and use the Wayland backend
 
-# Nvidia
-# env = GBM_BACKEND,nvidia-drm
+# Force NVIDIA as primary GPU
+# env = __NV_PRIME_RENDER_OFFLOAD,1
 # env = __GLX_VENDOR_LIBRARY_NAME,nvidia
+# env = __VK_LAYER_NV_optimus,NVIDIA_only
+# env = GBM_BACKEND,nvidia-drm
+# env = WLR_NO_HARDWARE_CURSORS,1
 # env = LIBVA_DRIVER_NAME,nvidia
 

.config/shell/profile

@@ -53,6 +53,18 @@ export PATH="$PATH:$XDG_DATA_HOME/cargo/bin"
 export MPD_HOST="localhost"
 export MPD_PORT="6600"
 
+
+# Force NVIDIA as primary GPU, if envycontrol mode is set to nvidia
+MODE=$(envycontrol -q)
+if [[ $MODE = "nvidia" ]]; then
+    export __NV_PRIME_RENDER_OFFLOAD=1
+    export __GLX_VENDOR_LIBRARY_NAME=nvidia
+    export __VK_LAYER_NV_optimus=NVIDIA_only
+    export GBM_BACKEND=nvidia-drm
+    export WLR_NO_HARDWARE_CURSORS=1
+    export LIBVA_DRIVER_NAME=nvidia
+fi
+
 # Mpd daemon start
 [ ! -s ~/.config/mpd/pid ] && mpd