51 lines
1.5 KiB
Rust
51 lines
1.5 KiB
Rust
use bevy::{
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core::{FixedTimestep, FixedTimesteps},
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prelude::*,
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};
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const LABEL: &str = "my_fixed_timestep";
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#[derive(Debug, Hash, PartialEq, Eq, Clone, StageLabel)]
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struct FixedUpdateStage;
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fn main() {
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App::build()
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.add_plugins(DefaultPlugins)
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// this system will run once every update (it should match your screen's refresh rate)
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.add_system(frame_update.system())
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// add a new stage that runs twice a second
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.add_stage_after(
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CoreStage::Update,
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FixedUpdateStage,
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SystemStage::parallel()
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.with_run_criteria(
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FixedTimestep::step(0.5)
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// labels are optional. they provide a way to access the current
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// FixedTimestep state from within a system
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.with_label(LABEL),
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)
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.with_system(fixed_update.system()),
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)
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.run();
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}
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fn frame_update(mut last_time: Local<f64>, time: Res<Time>) {
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info!("update: {}", time.seconds_since_startup() - *last_time);
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*last_time = time.seconds_since_startup();
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}
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fn fixed_update(mut last_time: Local<f64>, time: Res<Time>, fixed_timesteps: Res<FixedTimesteps>) {
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info!(
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"fixed_update: {}",
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time.seconds_since_startup() - *last_time,
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);
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let fixed_timestep = fixed_timesteps.get(LABEL).unwrap();
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info!(
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" overstep_percentage: {}",
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fixed_timestep.overstep_percentage()
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);
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*last_time = time.seconds_since_startup();
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}
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