55c84cc722
Added a `HeadlessPlugins` plugin group, that adds more default functionality (like logging) than the `MinimumPlugins`. Fixes #15203 Changed the headless example to use the new plugin group. I am not entirely sure if the list of plugins is correct. Are there ones that should be added / removed? ---- The `TerminalCtrlCHandlerPlugin` has interesting effects in the headless example: Installing it a second time it will give a log message about skipping installation, because it is already installed. Ctrl+C will terminate the application in that case. However, _not_ installing it the second time (so only on the app that runs once) has the effect that the app that runs continuously cannot be stopped using Ctrl+C. This implies that, even though the second app did not install the Ctrl+C handler, it did _something_ because it was keeping the one from the first app alive. Not sure if this is a problem or issue, or can be labeled a wierd quirk of having multiple Apps in one executable.
51 lines
1.4 KiB
Rust
51 lines
1.4 KiB
Rust
//! This example only enables a minimal set of plugins required for bevy to run.
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//! You can also completely remove rendering / windowing Plugin code from bevy
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//! by making your import look like this in your Cargo.toml.
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//!
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//! ```toml
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//! [dependencies]
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//! bevy = { version = "*", default-features = false }
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//! # replace "*" with the most recent version of bevy
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//! ```
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use bevy::{app::ScheduleRunnerPlugin, log::LogPlugin, prelude::*, utils::Duration};
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fn main() {
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// This app runs once
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App::new()
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.add_plugins(HeadlessPlugins.set(ScheduleRunnerPlugin::run_once()))
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.add_systems(Update, hello_world_system)
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.run();
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// This app loops forever at 60 fps
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App::new()
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.add_plugins(
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HeadlessPlugins
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.set(ScheduleRunnerPlugin::run_loop(Duration::from_secs_f64(
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1.0 / 60.0,
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)))
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// The log and ctrl+c plugin can only be registered once globally,
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// which means we need to disable it here, because it was already registered with the
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// app that runs once.
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.disable::<LogPlugin>(),
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)
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.add_systems(Update, counter)
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.run();
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}
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fn hello_world_system() {
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println!("hello world");
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}
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fn counter(mut state: Local<CounterState>) {
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if state.count % 60 == 0 {
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println!("{}", state.count);
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}
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state.count += 1;
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}
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#[derive(Default)]
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struct CounterState {
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count: u32,
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}
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