Monado launch script !! Has to be configured !! Configures which OpenVR compatibility layer and which monado build to launch, with support for multiple GPUs, and automatic insertion of launch options

start_monado.sh

#!/usr/bin/env sh

# Automatically configure OVR interface - config files have to be created beforehand!
OVR="$(echo $1 | tr '[:upper:]' '[:lower:]')"
if [[ $OVR != "steamvr" && $OVR != "xrizer" && $OVR != "opencomposite" ]]; then
    OVR=opencomposite
fi
OVR_CFG=~/.config/openvr/openvrpaths.vrpath.$OVR
if [[ -f $OVR_CFG ]]; then
    rm ~/.config/openvr/openvrpaths.vrpath
    cp $OVR_CFG ~/.config/openvr/openvrpaths.vrpath
else
    echo "Cannot automatically set up OpenVR configuration! Check '~/.config/openvr/openvrpaths.vrpath'!"
fi

# Specify install directory of monado
XR_RT="$(echo $2 | tr '[:upper:]' '[:lower:]')"
if [[ $XR_RT != "monado-default" && $XR_RT != "monado-thaytan" ]]; then
    XR_RT=monado-default
fi
# In case you have multiple installs manually built:
#MONADO=~/.local/share/$XR_RT # Example install directory
# This is for a default system install:
MONADO=/usr

# Automatically configure selected monado install as OpenXR runtime
if [[ -f "$MONADO/share/openxr/1/openxr_monado.json" ]]; then
    rm ~/.config/openxr/1/active_runtime.json
    ln -s $MONADO/share/openxr/1/openxr_monado.json ~/.config/openxr/1/active_runtime.json
else
    echo "Cannot automatically set up OpenXR configuration! Check '~/.config/openxr/1/active_runtime.json'!"
fi

# Safe performance defaults (e.g. for iGPU)
SCALE=40
GPU_NUM=0
GPU="$(echo $3 | tr '[:upper:]' '[:lower:]')"
if [[ $GPU == "egpu" || $GPU == "dgpu" ]]; then
    SCALE=180
    GPU_NUM=1 # This is strictly for second, external GPU! Remove DRI_PRIME below if you don't need this
fi

# WARNING: Hardcoded path to the system library of native steam version since that's what most use to play VR
STEAM_RT=~/.local/share/Steam/steamapps/common/SteamLinuxRuntime_sniper
# Use this one for flatpak (though there might be other problems)
#STEAM_RT=~/.var/app/com.valvesoftware.Steam/.local/share/Steam/steamapps/common/SteamLinuxRuntime_sniper
ENTRY_POINT=$STEAM_RT/_v2-entry-point
if [[ -d $STEAM_RT ]]; then
    echo "Trying to modify entry point variables!"
    if [[ ! -f $ENTRY_POINT.bak ]]; then
        cp $ENTRY_POINT $ENTRY_POINT.bak
    fi
    
    INSERT_LINE="exec \"\${here}/\${run}\" \"\$@\""
    # IPC for WiVrn and Monado
    IPC_ENV="export PRESSURE_VESSEL_FILESYSTEMS_RW=\"\$XDG_RUNTIME_DIR/wivrn_comp_ipc:\$XDG_RUNTIME_DIR/wivrn/comp_ipc:\$XDG_RUNTIME_DIR/monado_comp_ipc\""
    # Any other environment variables to set for each game
    GPU_ENV="export DRI_PRIME=$GPU_NUM"

	sed -i "s|$INSERT_LINE$|# OpenXR launch options\n$IPC_ENV\n$GPU_ENV\n\n$INSERT_LINE|" $ENTRY_POINT
else
    echo "Failed to modify entry point variables, update path or manually set game launch options!"
fi

XRT_DEBUG_GUI=1 XRT_COMPOSITOR_COMPUTE=1 XRT_COMPOSITOR_SCALE_PERCENTAGE=$SCALE XRT_CURATED_GUI=1 $MONADO/bin/monado-service

if [[ -d $STEAM_RT ]]; then
    echo "Restoring entry point variables!"
    if [[ -f $ENTRY_POINT.bak ]]; then
        cp $ENTRY_POINT.bak $ENTRY_POINT
    fi
fi