//! This example shows how to configure the `ScheduleRunnerPlugin` to run your //! application without windowing. You can completely remove rendering / windowing //! Plugin code from bevy by making your import look like this in your Cargo.toml. //! //! ```toml //! [dependencies] //! bevy = { version = "*", default-features = false } //! # replace "*" with the most recent version of bevy //! ``` //! //! And then enabling the features you need. //! See the full list: <https://docs.rs/bevy/latest/bevy/#cargo-features> use bevy::{app::ScheduleRunnerPlugin, log::LogPlugin, prelude::*, utils::Duration}; fn main() { if cfg!(feature = "bevy_window") { println!("This example is running with the bevy_window feature enabled and will not run headless."); println!("Disable the default features and rerun the example to run headless."); println!("To do so, run:"); println!(); println!(" cargo run --example headless --no-default-features"); return; } // This app runs once App::new() .add_plugins(DefaultPlugins.set(ScheduleRunnerPlugin::run_once())) .add_systems(Update, hello_world_system) .run(); // This app loops forever at 60 fps App::new() .add_plugins( DefaultPlugins .set(ScheduleRunnerPlugin::run_loop(Duration::from_secs_f64( 1.0 / 60.0, ))) // The log and ctrl+c plugin can only be registered once globally, // which means we need to disable it here, because it was already registered with the // app that runs once. .disable::<LogPlugin>(), ) .add_systems(Update, counter) .run(); } fn hello_world_system() { println!("hello world"); } fn counter(mut state: Local<CounterState>) { if state.count % 60 == 0 { println!("{}", state.count); } state.count += 1; } #[derive(Default)] struct CounterState { count: u32, }