Run app with NVIDIA PRIME using Bumblebee, e.g. ./prime-offload.sh xonotic

prime-offload.sh

#!/bin/bash

NVIDIA_DEV=/dev/nvidia0
BUMBLEBEE_SOCKET=/var/run/bumblebee.socket

function init {
    set -e

    # Create named pipes for talking with bumblebee
    local input output

    input=$(mktemp -u)
    mkfifo -m 600 "$input"
    output=$(mktemp -u)
    mkfifo -m 600 "$output"

    # Run netcat with our pipes instead of stdin/stdout
    # It will run in background and stop together with us
    nc -U $BUMBLEBEE_SOCKET <"$input" >"$output" &

    exec 4>"$input"
    exec 5<"$output"

    # Tell bumblebee to power on the card
    printf "C NoX\0" >&4
    local response
    read -u 5 -r response

    # Check the response
    local c="${response:0:1}"
    if [ "$c" != "Y" ]; then
        if [ -n "$response" ]; then
            echo "Bumblebee daemon reported: $response"
        else
            echo "Failure contacting Bumblebee daemon"
        fi
        exit 1
    fi

    # Remove pipe
    rm "$input" "$output"

    # Wait until modules are initialized
    sleep 0.1
}

function show_blockers {
    set -e

    BLOCKERS=$(lsof -Fc $NVIDIA_DEV 2>/dev/null)
    trap 'kill $(grep ^p <<< $BLOCKERS | cut -c2- | tr "\n" " ") 2>/dev/null' INT

    echo "$NVIDIA_DEV is in use by the following processes:"
    sed -z 's/p\(\S\+\)\sc\(\S\+\)\s/    \1 (\2)\n/g' <<< "$BLOCKERS"
    echo "Waiting for them, or press Ctrl+C to kill"
}

function finish {
    set -e

    # If finish() has already been called, just return
    [ -z "$FINISHED" ] || return
    FINISHED=1

    # Cleanup signal handler
    trap '' INT QUIT TERM

    # If there are another running apps, exit
    if [ "$(netstat -x | grep -cP "^unix\s+3\s.*$BUMBLEBEE_SOCKET$")" -gt 1 ]; then
        exit 0
    fi

    trap "echo; show_blockers" INT
    while [ -n "$(lsof -Fc $NVIDIA_DEV 2>/dev/null)" ]; do
        sleep 1
    done || :
}

init

# Handle signals
trap finish INT QUIT TERM

# Run the program on NVIDIA card
env __NV_PRIME_RENDER_OFFLOAD=1 \
    __GLX_VENDOR_LIBRARY_NAME=nvidia \
    __VK_LAYER_NV_optimus=NVIDIA_only \
    __GL_SYNC_TO_VBLANK=0 "$@" || :

finish