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Vendor dependencies for 0.3.0 release

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Robert Garrett
2025-09-27 10:29:08 -05:00
parent 0c8d39d483
commit 82ab7f317b
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{"files":{"Cargo.lock":"ba361fa9e06ff7a9376058adb43a733342fa926e8c8408e85667f18c8e3ffb32","Cargo.toml":"2a992170a111aa0c781b61f0e079ab536790acfe6051463304c36a84bc545735","LICENSE-APACHE":"a6cba85bc92e0cff7a450b1d873c0eaa2e9fc96bf472df0247a26bec77bf3ff9","LICENSE-MIT":"508a77d2e7b51d98adeed32648ad124b7b30241a8e70b2e72c99f92d8e5874d1","README.md":"4cd5509780254739a37db627412599c32a859a9054cd127ec05e94847202ac83","src/diagnostic.rs":"6cb07ce8531fb0ee5728cb25911209a8f10f02f13bbbc335d5b0b5198e2212f8","src/entity_count_diagnostics_plugin.rs":"315014a111b6aeb5c848fe05c67c73eb974947cfa468ac46112d379b5b7e1453","src/frame_count_diagnostics_plugin.rs":"c4615265c3201193066c76d593eb1e1d175d9c452dc2cdb92a823b37b6faccc1","src/frame_time_diagnostics_plugin.rs":"8fb560b26a7975ff4e99a3be8851147814e711d9661bb28f436ff0718ae42cc5","src/lib.rs":"c163090cd30ed9051c9bbb8e39b2c3d4bdd9fe82b0a84f3f13903a71cf81e0bb","src/log_diagnostics_plugin.rs":"c037ed1f79fe1153ae4e1cac1f7fdb58187d4490f2d19602c199594b530f736e","src/system_information_diagnostics_plugin.rs":"2c6dc8d7817f43185ae736316dcfce70676485fa6ca5b21953266058be989d36"},"package":"48797366f312a8f31e237d08ce3ee70162591282d2bfe7c5ad8be196fb263e55"}

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# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
#
# When uploading crates to the registry Cargo will automatically
# "normalize" Cargo.toml files for maximal compatibility
# with all versions of Cargo and also rewrite `path` dependencies
# to registry (e.g., crates.io) dependencies.
#
# If you are reading this file be aware that the original Cargo.toml
# will likely look very different (and much more reasonable).
# See Cargo.toml.orig for the original contents.
[package]
edition = "2024"
name = "bevy_diagnostic"
version = "0.16.1"
build = false
autolib = false
autobins = false
autoexamples = false
autotests = false
autobenches = false
description = "Provides diagnostic functionality for Bevy Engine"
homepage = "https://bevyengine.org"
readme = "README.md"
keywords = ["bevy"]
license = "MIT OR Apache-2.0"
repository = "https://github.com/bevyengine/bevy"
resolver = "2"
[package.metadata.docs.rs]
all-features = true
rustdoc-args = [
"-Zunstable-options",
"--generate-link-to-definition",
]
[features]
critical-section = [
"bevy_ecs/critical-section",
"bevy_app/critical-section",
"bevy_platform/critical-section",
"bevy_time/critical-section",
"bevy_utils/critical-section",
"bevy_tasks/critical-section",
]
default = [
"std",
"bevy_ecs/default",
]
dynamic_linking = []
serialize = [
"dep:serde",
"bevy_ecs/serialize",
"bevy_time/serialize",
"bevy_utils/serde",
"bevy_platform/serialize",
]
std = [
"serde?/std",
"bevy_ecs/std",
"bevy_app/std",
"bevy_platform/std",
"bevy_time/std",
"bevy_utils/std",
"bevy_tasks/std",
]
sysinfo_plugin = ["sysinfo"]
[lib]
name = "bevy_diagnostic"
path = "src/lib.rs"
[dependencies.bevy_app]
version = "0.16.1"
default-features = false
[dependencies.bevy_ecs]
version = "0.16.1"
default-features = false
[dependencies.bevy_platform]
version = "0.16.1"
features = ["alloc"]
default-features = false
[dependencies.bevy_tasks]
version = "0.16.1"
default-features = false
[dependencies.bevy_time]
version = "0.16.1"
default-features = false
[dependencies.bevy_utils]
version = "0.16.1"
features = ["alloc"]
default-features = false
[dependencies.const-fnv1a-hash]
version = "1.1.0"
[dependencies.log]
version = "0.4"
default-features = false
[dependencies.serde]
version = "1.0"
features = ["alloc"]
optional = true
default-features = false
[dev-dependencies.serde_test]
version = "1.0"
[target.'cfg(all(target_os="macos"))'.dependencies.sysinfo]
version = "0.34.0"
features = [
"apple-app-store",
"system",
]
optional = true
default-features = false
[target.'cfg(any(target_os = "linux", target_os = "windows", target_os = "android", target_os = "freebsd"))'.dependencies.sysinfo]
version = "0.34.0"
features = ["system"]
optional = true
default-features = false
[lints.clippy]
alloc_instead_of_core = "warn"
allow_attributes = "warn"
allow_attributes_without_reason = "warn"
doc_markdown = "warn"
manual_let_else = "warn"
match_same_arms = "warn"
needless_lifetimes = "allow"
nonstandard_macro_braces = "warn"
print_stderr = "warn"
print_stdout = "warn"
ptr_as_ptr = "warn"
ptr_cast_constness = "warn"
redundant_closure_for_method_calls = "warn"
redundant_else = "warn"
ref_as_ptr = "warn"
semicolon_if_nothing_returned = "warn"
std_instead_of_alloc = "warn"
std_instead_of_core = "warn"
too_long_first_doc_paragraph = "allow"
too_many_arguments = "allow"
type_complexity = "allow"
undocumented_unsafe_blocks = "warn"
unwrap_or_default = "warn"
[lints.rust]
missing_docs = "warn"
unsafe_code = "deny"
unsafe_op_in_unsafe_fn = "warn"
unused_qualifications = "warn"
[lints.rust.unexpected_cfgs]
level = "warn"
priority = 0
check-cfg = ["cfg(docsrs_dep)"]

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MIT License
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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# Bevy Diagnostic
[![License](https://img.shields.io/badge/license-MIT%2FApache-blue.svg)](https://github.com/bevyengine/bevy#license)
[![Crates.io](https://img.shields.io/crates/v/bevy_diagnostic.svg)](https://crates.io/crates/bevy_diagnostic)
[![Downloads](https://img.shields.io/crates/d/bevy_diagnostic.svg)](https://crates.io/crates/bevy_diagnostic)
[![Docs](https://docs.rs/bevy_diagnostic/badge.svg)](https://docs.rs/bevy_diagnostic/latest/bevy_diagnostic/)
[![Discord](https://img.shields.io/discord/691052431525675048.svg?label=&logo=discord&logoColor=ffffff&color=7389D8&labelColor=6A7EC2)](https://discord.gg/bevy)

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use alloc::{borrow::Cow, collections::VecDeque, string::String};
use core::{
hash::{Hash, Hasher},
time::Duration,
};
use bevy_app::{App, SubApp};
use bevy_ecs::resource::Resource;
use bevy_ecs::system::{Deferred, Res, SystemBuffer, SystemParam};
use bevy_platform::{collections::HashMap, hash::PassHash, time::Instant};
use const_fnv1a_hash::fnv1a_hash_str_64;
use crate::DEFAULT_MAX_HISTORY_LENGTH;
/// Unique diagnostic path, separated by `/`.
///
/// Requirements:
/// - Can't be empty
/// - Can't have leading or trailing `/`
/// - Can't have empty components.
#[derive(Debug, Clone)]
pub struct DiagnosticPath {
path: Cow<'static, str>,
hash: u64,
}
impl DiagnosticPath {
/// Create a new `DiagnosticPath`. Usable in const contexts.
///
/// **Note**: path is not validated, so make sure it follows all the requirements.
pub const fn const_new(path: &'static str) -> DiagnosticPath {
DiagnosticPath {
path: Cow::Borrowed(path),
hash: fnv1a_hash_str_64(path),
}
}
/// Create a new `DiagnosticPath` from the specified string.
pub fn new(path: impl Into<Cow<'static, str>>) -> DiagnosticPath {
let path = path.into();
debug_assert!(!path.is_empty(), "diagnostic path can't be empty");
debug_assert!(
!path.starts_with('/'),
"diagnostic path can't be start with `/`"
);
debug_assert!(
!path.ends_with('/'),
"diagnostic path can't be end with `/`"
);
debug_assert!(
!path.contains("//"),
"diagnostic path can't contain empty components"
);
DiagnosticPath {
hash: fnv1a_hash_str_64(&path),
path,
}
}
/// Create a new `DiagnosticPath` from an iterator over components.
pub fn from_components<'a>(components: impl IntoIterator<Item = &'a str>) -> DiagnosticPath {
let mut buf = String::new();
for (i, component) in components.into_iter().enumerate() {
if i > 0 {
buf.push('/');
}
buf.push_str(component);
}
DiagnosticPath::new(buf)
}
/// Returns full path, joined by `/`
pub fn as_str(&self) -> &str {
&self.path
}
/// Returns an iterator over path components.
pub fn components(&self) -> impl Iterator<Item = &str> + '_ {
self.path.split('/')
}
}
impl From<DiagnosticPath> for String {
fn from(path: DiagnosticPath) -> Self {
path.path.into()
}
}
impl Eq for DiagnosticPath {}
impl PartialEq for DiagnosticPath {
fn eq(&self, other: &Self) -> bool {
self.hash == other.hash && self.path == other.path
}
}
impl Hash for DiagnosticPath {
fn hash<H: Hasher>(&self, state: &mut H) {
state.write_u64(self.hash);
}
}
impl core::fmt::Display for DiagnosticPath {
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
self.path.fmt(f)
}
}
/// A single measurement of a [`Diagnostic`].
#[derive(Debug)]
pub struct DiagnosticMeasurement {
pub time: Instant,
pub value: f64,
}
/// A timeline of [`DiagnosticMeasurement`]s of a specific type.
/// Diagnostic examples: frames per second, CPU usage, network latency
#[derive(Debug)]
pub struct Diagnostic {
path: DiagnosticPath,
pub suffix: Cow<'static, str>,
history: VecDeque<DiagnosticMeasurement>,
sum: f64,
ema: f64,
ema_smoothing_factor: f64,
max_history_length: usize,
pub is_enabled: bool,
}
impl Diagnostic {
/// Add a new value as a [`DiagnosticMeasurement`].
pub fn add_measurement(&mut self, measurement: DiagnosticMeasurement) {
if measurement.value.is_nan() {
// Skip calculating the moving average.
} else if let Some(previous) = self.measurement() {
let delta = (measurement.time - previous.time).as_secs_f64();
let alpha = (delta / self.ema_smoothing_factor).clamp(0.0, 1.0);
self.ema += alpha * (measurement.value - self.ema);
} else {
self.ema = measurement.value;
}
if self.max_history_length > 1 {
if self.history.len() >= self.max_history_length {
if let Some(removed_diagnostic) = self.history.pop_front() {
if !removed_diagnostic.value.is_nan() {
self.sum -= removed_diagnostic.value;
}
}
}
if measurement.value.is_finite() {
self.sum += measurement.value;
}
} else {
self.history.clear();
if measurement.value.is_nan() {
self.sum = 0.0;
} else {
self.sum = measurement.value;
}
}
self.history.push_back(measurement);
}
/// Create a new diagnostic with the given path.
pub fn new(path: DiagnosticPath) -> Diagnostic {
Diagnostic {
path,
suffix: Cow::Borrowed(""),
history: VecDeque::with_capacity(DEFAULT_MAX_HISTORY_LENGTH),
max_history_length: DEFAULT_MAX_HISTORY_LENGTH,
sum: 0.0,
ema: 0.0,
ema_smoothing_factor: 2.0 / 21.0,
is_enabled: true,
}
}
/// Set the maximum history length.
#[must_use]
pub fn with_max_history_length(mut self, max_history_length: usize) -> Self {
self.max_history_length = max_history_length;
// reserve/reserve_exact reserve space for n *additional* elements.
let expected_capacity = self
.max_history_length
.saturating_sub(self.history.capacity());
self.history.reserve_exact(expected_capacity);
self.history.shrink_to(expected_capacity);
self
}
/// Add a suffix to use when logging the value, can be used to show a unit.
#[must_use]
pub fn with_suffix(mut self, suffix: impl Into<Cow<'static, str>>) -> Self {
self.suffix = suffix.into();
self
}
/// The smoothing factor used for the exponential smoothing used for
/// [`smoothed`](Self::smoothed).
///
/// If measurements come in less frequently than `smoothing_factor` seconds
/// apart, no smoothing will be applied. As measurements come in more
/// frequently, the smoothing takes a greater effect such that it takes
/// approximately `smoothing_factor` seconds for 83% of an instantaneous
/// change in measurement to e reflected in the smoothed value.
///
/// A smoothing factor of 0.0 will effectively disable smoothing.
#[must_use]
pub fn with_smoothing_factor(mut self, smoothing_factor: f64) -> Self {
self.ema_smoothing_factor = smoothing_factor;
self
}
pub fn path(&self) -> &DiagnosticPath {
&self.path
}
/// Get the latest measurement from this diagnostic.
#[inline]
pub fn measurement(&self) -> Option<&DiagnosticMeasurement> {
self.history.back()
}
/// Get the latest value from this diagnostic.
pub fn value(&self) -> Option<f64> {
self.measurement().map(|measurement| measurement.value)
}
/// Return the simple moving average of this diagnostic's recent values.
/// N.B. this a cheap operation as the sum is cached.
pub fn average(&self) -> Option<f64> {
if !self.history.is_empty() {
Some(self.sum / self.history.len() as f64)
} else {
None
}
}
/// Return the exponential moving average of this diagnostic.
///
/// This is by default tuned to behave reasonably well for a typical
/// measurement that changes every frame such as frametime. This can be
/// adjusted using [`with_smoothing_factor`](Self::with_smoothing_factor).
pub fn smoothed(&self) -> Option<f64> {
if !self.history.is_empty() {
Some(self.ema)
} else {
None
}
}
/// Return the number of elements for this diagnostic.
pub fn history_len(&self) -> usize {
self.history.len()
}
/// Return the duration between the oldest and most recent values for this diagnostic.
pub fn duration(&self) -> Option<Duration> {
if self.history.len() < 2 {
return None;
}
if let Some(newest) = self.history.back() {
if let Some(oldest) = self.history.front() {
return Some(newest.time.duration_since(oldest.time));
}
}
None
}
/// Return the maximum number of elements for this diagnostic.
pub fn get_max_history_length(&self) -> usize {
self.max_history_length
}
pub fn values(&self) -> impl Iterator<Item = &f64> {
self.history.iter().map(|x| &x.value)
}
pub fn measurements(&self) -> impl Iterator<Item = &DiagnosticMeasurement> {
self.history.iter()
}
/// Clear the history of this diagnostic.
pub fn clear_history(&mut self) {
self.history.clear();
self.sum = 0.0;
self.ema = 0.0;
}
}
/// A collection of [`Diagnostic`]s.
#[derive(Debug, Default, Resource)]
pub struct DiagnosticsStore {
diagnostics: HashMap<DiagnosticPath, Diagnostic, PassHash>,
}
impl DiagnosticsStore {
/// Add a new [`Diagnostic`].
///
/// If possible, prefer calling [`App::register_diagnostic`].
pub fn add(&mut self, diagnostic: Diagnostic) {
self.diagnostics.insert(diagnostic.path.clone(), diagnostic);
}
pub fn get(&self, path: &DiagnosticPath) -> Option<&Diagnostic> {
self.diagnostics.get(path)
}
pub fn get_mut(&mut self, path: &DiagnosticPath) -> Option<&mut Diagnostic> {
self.diagnostics.get_mut(path)
}
/// Get the latest [`DiagnosticMeasurement`] from an enabled [`Diagnostic`].
pub fn get_measurement(&self, path: &DiagnosticPath) -> Option<&DiagnosticMeasurement> {
self.diagnostics
.get(path)
.filter(|diagnostic| diagnostic.is_enabled)
.and_then(|diagnostic| diagnostic.measurement())
}
/// Return an iterator over all [`Diagnostic`]s.
pub fn iter(&self) -> impl Iterator<Item = &Diagnostic> {
self.diagnostics.values()
}
/// Return an iterator over all [`Diagnostic`]s, by mutable reference.
pub fn iter_mut(&mut self) -> impl Iterator<Item = &mut Diagnostic> {
self.diagnostics.values_mut()
}
}
/// Record new [`DiagnosticMeasurement`]'s.
#[derive(SystemParam)]
pub struct Diagnostics<'w, 's> {
store: Res<'w, DiagnosticsStore>,
queue: Deferred<'s, DiagnosticsBuffer>,
}
impl<'w, 's> Diagnostics<'w, 's> {
/// Add a measurement to an enabled [`Diagnostic`]. The measurement is passed as a function so that
/// it will be evaluated only if the [`Diagnostic`] is enabled. This can be useful if the value is
/// costly to calculate.
pub fn add_measurement<F>(&mut self, path: &DiagnosticPath, value: F)
where
F: FnOnce() -> f64,
{
if self
.store
.get(path)
.is_some_and(|diagnostic| diagnostic.is_enabled)
{
let measurement = DiagnosticMeasurement {
time: Instant::now(),
value: value(),
};
self.queue.0.insert(path.clone(), measurement);
}
}
}
#[derive(Default)]
struct DiagnosticsBuffer(HashMap<DiagnosticPath, DiagnosticMeasurement, PassHash>);
impl SystemBuffer for DiagnosticsBuffer {
fn apply(
&mut self,
_system_meta: &bevy_ecs::system::SystemMeta,
world: &mut bevy_ecs::world::World,
) {
let mut diagnostics = world.resource_mut::<DiagnosticsStore>();
for (path, measurement) in self.0.drain() {
if let Some(diagnostic) = diagnostics.get_mut(&path) {
diagnostic.add_measurement(measurement);
}
}
}
}
/// Extend [`App`] with new `register_diagnostic` function.
pub trait RegisterDiagnostic {
/// Register a new [`Diagnostic`] with an [`App`].
///
/// Will initialize a [`DiagnosticsStore`] if it doesn't exist.
///
/// ```
/// use bevy_app::App;
/// use bevy_diagnostic::{Diagnostic, DiagnosticsPlugin, DiagnosticPath, RegisterDiagnostic};
///
/// const UNIQUE_DIAG_PATH: DiagnosticPath = DiagnosticPath::const_new("foo/bar");
///
/// App::new()
/// .register_diagnostic(Diagnostic::new(UNIQUE_DIAG_PATH))
/// .add_plugins(DiagnosticsPlugin)
/// .run();
/// ```
fn register_diagnostic(&mut self, diagnostic: Diagnostic) -> &mut Self;
}
impl RegisterDiagnostic for SubApp {
fn register_diagnostic(&mut self, diagnostic: Diagnostic) -> &mut Self {
self.init_resource::<DiagnosticsStore>();
let mut diagnostics = self.world_mut().resource_mut::<DiagnosticsStore>();
diagnostics.add(diagnostic);
self
}
}
impl RegisterDiagnostic for App {
fn register_diagnostic(&mut self, diagnostic: Diagnostic) -> &mut Self {
SubApp::register_diagnostic(self.main_mut(), diagnostic);
self
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_clear_history() {
const MEASUREMENT: f64 = 20.0;
let mut diagnostic =
Diagnostic::new(DiagnosticPath::new("test")).with_max_history_length(5);
let mut now = Instant::now();
for _ in 0..3 {
for _ in 0..5 {
diagnostic.add_measurement(DiagnosticMeasurement {
time: now,
value: MEASUREMENT,
});
// Increase time to test smoothed average.
now += Duration::from_secs(1);
}
assert!((diagnostic.average().unwrap() - MEASUREMENT).abs() < 0.1);
assert!((diagnostic.smoothed().unwrap() - MEASUREMENT).abs() < 0.1);
diagnostic.clear_history();
}
}
}

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use bevy_app::prelude::*;
use bevy_ecs::entity::Entities;
use crate::{Diagnostic, DiagnosticPath, Diagnostics, RegisterDiagnostic};
/// Adds "entity count" diagnostic to an App.
///
/// # See also
///
/// [`LogDiagnosticsPlugin`](crate::LogDiagnosticsPlugin) to output diagnostics to the console.
#[derive(Default)]
pub struct EntityCountDiagnosticsPlugin;
impl Plugin for EntityCountDiagnosticsPlugin {
fn build(&self, app: &mut App) {
app.register_diagnostic(Diagnostic::new(Self::ENTITY_COUNT))
.add_systems(Update, Self::diagnostic_system);
}
}
impl EntityCountDiagnosticsPlugin {
pub const ENTITY_COUNT: DiagnosticPath = DiagnosticPath::const_new("entity_count");
pub fn diagnostic_system(mut diagnostics: Diagnostics, entities: &Entities) {
diagnostics.add_measurement(&Self::ENTITY_COUNT, || entities.len() as f64);
}
}

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use bevy_app::prelude::*;
use bevy_ecs::prelude::*;
#[cfg(feature = "serialize")]
use serde::{
de::{Error, Visitor},
Deserialize, Deserializer, Serialize, Serializer,
};
/// Maintains a count of frames rendered since the start of the application.
///
/// [`FrameCount`] is incremented during [`Last`], providing predictable
/// behavior: it will be 0 during the first update, 1 during the next, and so forth.
///
/// # Overflows
///
/// [`FrameCount`] will wrap to 0 after exceeding [`u32::MAX`]. Within reasonable
/// assumptions, one may exploit wrapping arithmetic to determine the number of frames
/// that have elapsed between two observations – see [`u32::wrapping_sub()`].
#[derive(Debug, Default, Resource, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
pub struct FrameCount(pub u32);
/// Adds frame counting functionality to Apps.
#[derive(Default)]
pub struct FrameCountPlugin;
impl Plugin for FrameCountPlugin {
fn build(&self, app: &mut App) {
app.init_resource::<FrameCount>();
app.add_systems(Last, update_frame_count);
}
}
/// A system used to increment [`FrameCount`] with wrapping addition.
///
/// See [`FrameCount`] for more details.
pub fn update_frame_count(mut frame_count: ResMut<FrameCount>) {
frame_count.0 = frame_count.0.wrapping_add(1);
}
#[cfg(feature = "serialize")]
// Manually implementing serialize/deserialize allows us to use a more compact representation as simple integers
impl Serialize for FrameCount {
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
serializer.serialize_u32(self.0)
}
}
#[cfg(feature = "serialize")]
impl<'de> Deserialize<'de> for FrameCount {
fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
deserializer.deserialize_u32(FrameVisitor)
}
}
#[cfg(feature = "serialize")]
struct FrameVisitor;
#[cfg(feature = "serialize")]
impl<'de> Visitor<'de> for FrameVisitor {
type Value = FrameCount;
fn expecting(&self, formatter: &mut core::fmt::Formatter) -> core::fmt::Result {
formatter.write_str(core::any::type_name::<FrameCount>())
}
fn visit_u32<E>(self, v: u32) -> Result<Self::Value, E>
where
E: Error,
{
Ok(FrameCount(v))
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn frame_counter_update() {
let mut app = App::new();
app.add_plugins(FrameCountPlugin);
app.update();
let frame_count = app.world().resource::<FrameCount>();
assert_eq!(1, frame_count.0);
}
}
#[cfg(all(test, feature = "serialize"))]
mod serde_tests {
use super::*;
use serde_test::{assert_tokens, Token};
#[test]
fn test_serde_frame_count() {
let frame_count = FrameCount(100);
assert_tokens(&frame_count, &[Token::U32(100)]);
}
}

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vendor/bevy_diagnostic/src/frame_time_diagnostics_plugin.rs vendored Normal file
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use crate::{
Diagnostic, DiagnosticPath, Diagnostics, FrameCount, RegisterDiagnostic,
DEFAULT_MAX_HISTORY_LENGTH,
};
use bevy_app::prelude::*;
use bevy_ecs::prelude::*;
use bevy_time::{Real, Time};
/// Adds "frame time" diagnostic to an App, specifically "frame time", "fps" and "frame count"
///
/// # See also
///
/// [`LogDiagnosticsPlugin`](crate::LogDiagnosticsPlugin) to output diagnostics to the console.
pub struct FrameTimeDiagnosticsPlugin {
/// The total number of values to keep for averaging.
pub max_history_length: usize,
/// The smoothing factor for the exponential moving average. Usually `2.0 / (history_length + 1.0)`.
pub smoothing_factor: f64,
}
impl Default for FrameTimeDiagnosticsPlugin {
fn default() -> Self {
Self::new(DEFAULT_MAX_HISTORY_LENGTH)
}
}
impl FrameTimeDiagnosticsPlugin {
/// Creates a new `FrameTimeDiagnosticsPlugin` with the specified `max_history_length` and a
/// reasonable `smoothing_factor`.
pub fn new(max_history_length: usize) -> Self {
Self {
max_history_length,
smoothing_factor: 2.0 / (max_history_length as f64 + 1.0),
}
}
}
impl Plugin for FrameTimeDiagnosticsPlugin {
fn build(&self, app: &mut App) {
app.register_diagnostic(
Diagnostic::new(Self::FRAME_TIME)
.with_suffix("ms")
.with_max_history_length(self.max_history_length)
.with_smoothing_factor(self.smoothing_factor),
)
.register_diagnostic(
Diagnostic::new(Self::FPS)
.with_max_history_length(self.max_history_length)
.with_smoothing_factor(self.smoothing_factor),
)
// An average frame count would be nonsensical, so we set the max history length
// to zero and disable smoothing.
.register_diagnostic(
Diagnostic::new(Self::FRAME_COUNT)
.with_smoothing_factor(0.0)
.with_max_history_length(0),
)
.add_systems(Update, Self::diagnostic_system);
}
}
impl FrameTimeDiagnosticsPlugin {
pub const FPS: DiagnosticPath = DiagnosticPath::const_new("fps");
pub const FRAME_COUNT: DiagnosticPath = DiagnosticPath::const_new("frame_count");
pub const FRAME_TIME: DiagnosticPath = DiagnosticPath::const_new("frame_time");
pub fn diagnostic_system(
mut diagnostics: Diagnostics,
time: Res<Time<Real>>,
frame_count: Res<FrameCount>,
) {
diagnostics.add_measurement(&Self::FRAME_COUNT, || frame_count.0 as f64);
let delta_seconds = time.delta_secs_f64();
if delta_seconds == 0.0 {
return;
}
diagnostics.add_measurement(&Self::FRAME_TIME, || delta_seconds * 1000.0);
diagnostics.add_measurement(&Self::FPS, || 1.0 / delta_seconds);
}
}

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#![expect(missing_docs, reason = "Not all docs are written yet, see #3492.")]
#![cfg_attr(docsrs, feature(doc_auto_cfg))]
#![forbid(unsafe_code)]
#![doc(
html_logo_url = "https://bevyengine.org/assets/icon.png",
html_favicon_url = "https://bevyengine.org/assets/icon.png"
)]
#![no_std]
//! This crate provides a straightforward solution for integrating diagnostics in the [Bevy game engine](https://bevyengine.org/).
//! It allows users to easily add diagnostic functionality to their Bevy applications, enhancing
//! their ability to monitor and optimize their game's.
#[cfg(feature = "std")]
extern crate std;
extern crate alloc;
mod diagnostic;
mod entity_count_diagnostics_plugin;
mod frame_count_diagnostics_plugin;
mod frame_time_diagnostics_plugin;
mod log_diagnostics_plugin;
#[cfg(feature = "sysinfo_plugin")]
mod system_information_diagnostics_plugin;
pub use diagnostic::*;
pub use entity_count_diagnostics_plugin::EntityCountDiagnosticsPlugin;
pub use frame_count_diagnostics_plugin::{update_frame_count, FrameCount, FrameCountPlugin};
pub use frame_time_diagnostics_plugin::FrameTimeDiagnosticsPlugin;
pub use log_diagnostics_plugin::LogDiagnosticsPlugin;
#[cfg(feature = "sysinfo_plugin")]
pub use system_information_diagnostics_plugin::{SystemInfo, SystemInformationDiagnosticsPlugin};
use bevy_app::prelude::*;
/// Adds core diagnostics resources to an App.
#[derive(Default)]
pub struct DiagnosticsPlugin;
impl Plugin for DiagnosticsPlugin {
fn build(&self, app: &mut App) {
app.init_resource::<DiagnosticsStore>();
#[cfg(feature = "sysinfo_plugin")]
app.init_resource::<SystemInfo>();
}
}
/// Default max history length for new diagnostics.
pub const DEFAULT_MAX_HISTORY_LENGTH: usize = 120;

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use super::{Diagnostic, DiagnosticPath, DiagnosticsStore};
use alloc::vec::Vec;
use bevy_app::prelude::*;
use bevy_ecs::prelude::*;
use bevy_time::{Real, Time, Timer, TimerMode};
use core::time::Duration;
use log::{debug, info};
/// An App Plugin that logs diagnostics to the console.
///
/// Diagnostics are collected by plugins such as
/// [`FrameTimeDiagnosticsPlugin`](crate::FrameTimeDiagnosticsPlugin)
/// or can be provided by the user.
///
/// When no diagnostics are provided, this plugin does nothing.
pub struct LogDiagnosticsPlugin {
pub debug: bool,
pub wait_duration: Duration,
pub filter: Option<Vec<DiagnosticPath>>,
}
/// State used by the [`LogDiagnosticsPlugin`]
#[derive(Resource)]
struct LogDiagnosticsState {
timer: Timer,
filter: Option<Vec<DiagnosticPath>>,
}
impl Default for LogDiagnosticsPlugin {
fn default() -> Self {
LogDiagnosticsPlugin {
debug: false,
wait_duration: Duration::from_secs(1),
filter: None,
}
}
}
impl Plugin for LogDiagnosticsPlugin {
fn build(&self, app: &mut App) {
app.insert_resource(LogDiagnosticsState {
timer: Timer::new(self.wait_duration, TimerMode::Repeating),
filter: self.filter.clone(),
});
if self.debug {
app.add_systems(PostUpdate, Self::log_diagnostics_debug_system);
} else {
app.add_systems(PostUpdate, Self::log_diagnostics_system);
}
}
}
impl LogDiagnosticsPlugin {
pub fn filtered(filter: Vec<DiagnosticPath>) -> Self {
LogDiagnosticsPlugin {
filter: Some(filter),
..Default::default()
}
}
fn for_each_diagnostic(
state: &LogDiagnosticsState,
diagnostics: &DiagnosticsStore,
mut callback: impl FnMut(&Diagnostic),
) {
if let Some(filter) = &state.filter {
for path in filter {
if let Some(diagnostic) = diagnostics.get(path) {
if diagnostic.is_enabled {
callback(diagnostic);
}
}
}
} else {
for diagnostic in diagnostics.iter() {
if diagnostic.is_enabled {
callback(diagnostic);
}
}
}
}
fn log_diagnostic(path_width: usize, diagnostic: &Diagnostic) {
let Some(value) = diagnostic.smoothed() else {
return;
};
if diagnostic.get_max_history_length() > 1 {
let Some(average) = diagnostic.average() else {
return;
};
info!(
target: "bevy_diagnostic",
// Suffix is only used for 's' or 'ms' currently,
// so we reserve two columns for it; however,
// Do not reserve columns for the suffix in the average
// The ) hugging the value is more aesthetically pleasing
"{path:<path_width$}: {value:>11.6}{suffix:2} (avg {average:>.6}{suffix:})",
path = diagnostic.path(),
suffix = diagnostic.suffix,
);
} else {
info!(
target: "bevy_diagnostic",
"{path:<path_width$}: {value:>.6}{suffix:}",
path = diagnostic.path(),
suffix = diagnostic.suffix,
);
}
}
fn log_diagnostics(state: &LogDiagnosticsState, diagnostics: &DiagnosticsStore) {
let mut path_width = 0;
Self::for_each_diagnostic(state, diagnostics, |diagnostic| {
let width = diagnostic.path().as_str().len();
path_width = path_width.max(width);
});
Self::for_each_diagnostic(state, diagnostics, |diagnostic| {
Self::log_diagnostic(path_width, diagnostic);
});
}
fn log_diagnostics_system(
mut state: ResMut<LogDiagnosticsState>,
time: Res<Time<Real>>,
diagnostics: Res<DiagnosticsStore>,
) {
if state.timer.tick(time.delta()).finished() {
Self::log_diagnostics(&state, &diagnostics);
}
}
fn log_diagnostics_debug_system(
mut state: ResMut<LogDiagnosticsState>,
time: Res<Time<Real>>,
diagnostics: Res<DiagnosticsStore>,
) {
if state.timer.tick(time.delta()).finished() {
Self::for_each_diagnostic(&state, &diagnostics, |diagnostic| {
debug!("{:#?}\n", diagnostic);
});
}
}
}

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use crate::DiagnosticPath;
use alloc::string::String;
use bevy_app::prelude::*;
use bevy_ecs::resource::Resource;
/// Adds a System Information Diagnostic, specifically `cpu_usage` (in %) and `mem_usage` (in %)
///
/// Note that gathering system information is a time intensive task and therefore can't be done on every frame.
/// Any system diagnostics gathered by this plugin may not be current when you access them.
///
/// Supported targets:
/// * linux,
/// * windows,
/// * android,
/// * macOS
///
/// NOT supported when using the `bevy/dynamic` feature even when using previously mentioned targets
///
/// # See also
///
/// [`LogDiagnosticsPlugin`](crate::LogDiagnosticsPlugin) to output diagnostics to the console.
#[derive(Default)]
pub struct SystemInformationDiagnosticsPlugin;
impl Plugin for SystemInformationDiagnosticsPlugin {
fn build(&self, app: &mut App) {
internal::setup_plugin(app);
}
}
impl SystemInformationDiagnosticsPlugin {
/// Total system cpu usage in %
pub const SYSTEM_CPU_USAGE: DiagnosticPath = DiagnosticPath::const_new("system/cpu_usage");
/// Total system memory usage in %
pub const SYSTEM_MEM_USAGE: DiagnosticPath = DiagnosticPath::const_new("system/mem_usage");
/// Process cpu usage in %
pub const PROCESS_CPU_USAGE: DiagnosticPath = DiagnosticPath::const_new("process/cpu_usage");
/// Process memory usage in %
pub const PROCESS_MEM_USAGE: DiagnosticPath = DiagnosticPath::const_new("process/mem_usage");
}
/// A resource that stores diagnostic information about the system.
/// This information can be useful for debugging and profiling purposes.
///
/// # See also
///
/// [`SystemInformationDiagnosticsPlugin`] for more information.
#[derive(Debug, Resource)]
pub struct SystemInfo {
pub os: String,
pub kernel: String,
pub cpu: String,
pub core_count: String,
pub memory: String,
}
// NOTE: sysinfo fails to compile when using bevy dynamic or on iOS and does nothing on Wasm
#[cfg(all(
any(
target_os = "linux",
target_os = "windows",
target_os = "android",
target_os = "macos"
),
not(feature = "dynamic_linking"),
feature = "std",
))]
pub mod internal {
use alloc::{
format,
string::{String, ToString},
sync::Arc,
vec::Vec,
};
use bevy_app::{App, First, Startup, Update};
use bevy_ecs::resource::Resource;
use bevy_ecs::{prelude::ResMut, system::Local};
use bevy_platform::time::Instant;
use bevy_tasks::{available_parallelism, block_on, poll_once, AsyncComputeTaskPool, Task};
use log::info;
use std::sync::Mutex;
use sysinfo::{CpuRefreshKind, MemoryRefreshKind, RefreshKind, System};
use crate::{Diagnostic, Diagnostics, DiagnosticsStore};
use super::{SystemInfo, SystemInformationDiagnosticsPlugin};
const BYTES_TO_GIB: f64 = 1.0 / 1024.0 / 1024.0 / 1024.0;
pub(super) fn setup_plugin(app: &mut App) {
app.add_systems(Startup, setup_system)
.add_systems(First, launch_diagnostic_tasks)
.add_systems(Update, read_diagnostic_tasks)
.init_resource::<SysinfoTasks>();
}
fn setup_system(mut diagnostics: ResMut<DiagnosticsStore>) {
diagnostics.add(
Diagnostic::new(SystemInformationDiagnosticsPlugin::SYSTEM_CPU_USAGE).with_suffix("%"),
);
diagnostics.add(
Diagnostic::new(SystemInformationDiagnosticsPlugin::SYSTEM_MEM_USAGE).with_suffix("%"),
);
diagnostics.add(
Diagnostic::new(SystemInformationDiagnosticsPlugin::PROCESS_CPU_USAGE).with_suffix("%"),
);
diagnostics.add(
Diagnostic::new(SystemInformationDiagnosticsPlugin::PROCESS_MEM_USAGE)
.with_suffix("GiB"),
);
}
struct SysinfoRefreshData {
system_cpu_usage: f64,
system_mem_usage: f64,
process_cpu_usage: f64,
process_mem_usage: f64,
}
#[derive(Resource, Default)]
struct SysinfoTasks {
tasks: Vec<Task<SysinfoRefreshData>>,
}
fn launch_diagnostic_tasks(
mut tasks: ResMut<SysinfoTasks>,
// TODO: Consider a fair mutex
mut sysinfo: Local<Option<Arc<Mutex<System>>>>,
// TODO: FromWorld for Instant?
mut last_refresh: Local<Option<Instant>>,
) {
let sysinfo = sysinfo.get_or_insert_with(|| {
Arc::new(Mutex::new(System::new_with_specifics(
RefreshKind::nothing()
.with_cpu(CpuRefreshKind::nothing().with_cpu_usage())
.with_memory(MemoryRefreshKind::everything()),
)))
});
let last_refresh = last_refresh.get_or_insert_with(Instant::now);
let thread_pool = AsyncComputeTaskPool::get();
// Only queue a new system refresh task when necessary
// Queuing earlier than that will not give new data
if last_refresh.elapsed() > sysinfo::MINIMUM_CPU_UPDATE_INTERVAL
// These tasks don't yield and will take up all of the task pool's
// threads if we don't limit their amount.
&& tasks.tasks.len() * 2 < available_parallelism()
{
let sys = Arc::clone(sysinfo);
let task = thread_pool.spawn(async move {
let mut sys = sys.lock().unwrap();
let pid = sysinfo::get_current_pid().expect("Failed to get current process ID");
sys.refresh_processes(sysinfo::ProcessesToUpdate::Some(&[pid]), true);
sys.refresh_cpu_specifics(CpuRefreshKind::nothing().with_cpu_usage());
sys.refresh_memory();
let system_cpu_usage = sys.global_cpu_usage().into();
let total_mem = sys.total_memory() as f64;
let used_mem = sys.used_memory() as f64;
let system_mem_usage = used_mem / total_mem * 100.0;
let process_mem_usage = sys
.process(pid)
.map(|p| p.memory() as f64 * BYTES_TO_GIB)
.unwrap_or(0.0);
let process_cpu_usage = sys
.process(pid)
.map(|p| p.cpu_usage() as f64 / sys.cpus().len() as f64)
.unwrap_or(0.0);
SysinfoRefreshData {
system_cpu_usage,
system_mem_usage,
process_cpu_usage,
process_mem_usage,
}
});
tasks.tasks.push(task);
*last_refresh = Instant::now();
}
}
fn read_diagnostic_tasks(mut diagnostics: Diagnostics, mut tasks: ResMut<SysinfoTasks>) {
tasks.tasks.retain_mut(|task| {
let Some(data) = block_on(poll_once(task)) else {
return true;
};
diagnostics.add_measurement(
&SystemInformationDiagnosticsPlugin::SYSTEM_CPU_USAGE,
|| data.system_cpu_usage,
);
diagnostics.add_measurement(
&SystemInformationDiagnosticsPlugin::SYSTEM_MEM_USAGE,
|| data.system_mem_usage,
);
diagnostics.add_measurement(
&SystemInformationDiagnosticsPlugin::PROCESS_CPU_USAGE,
|| data.process_cpu_usage,
);
diagnostics.add_measurement(
&SystemInformationDiagnosticsPlugin::PROCESS_MEM_USAGE,
|| data.process_mem_usage,
);
false
});
}
impl Default for SystemInfo {
fn default() -> Self {
let sys = System::new_with_specifics(
RefreshKind::nothing()
.with_cpu(CpuRefreshKind::nothing())
.with_memory(MemoryRefreshKind::nothing().with_ram()),
);
let system_info = SystemInfo {
os: System::long_os_version().unwrap_or_else(|| String::from("not available")),
kernel: System::kernel_version().unwrap_or_else(|| String::from("not available")),
cpu: sys
.cpus()
.first()
.map(|cpu| cpu.brand().trim().to_string())
.unwrap_or_else(|| String::from("not available")),
core_count: System::physical_core_count()
.map(|x| x.to_string())
.unwrap_or_else(|| String::from("not available")),
// Convert from Bytes to GibiBytes since it's probably what people expect most of the time
memory: format!("{:.1} GiB", sys.total_memory() as f64 * BYTES_TO_GIB),
};
info!("{:?}", system_info);
system_info
}
}
}
#[cfg(not(all(
any(
target_os = "linux",
target_os = "windows",
target_os = "android",
target_os = "macos"
),
not(feature = "dynamic_linking"),
feature = "std",
)))]
pub mod internal {
use alloc::string::ToString;
use bevy_app::{App, Startup};
pub(super) fn setup_plugin(app: &mut App) {
app.add_systems(Startup, setup_system);
}
fn setup_system() {
log::warn!("This platform and/or configuration is not supported!");
}
impl Default for super::SystemInfo {
fn default() -> Self {
let unknown = "Unknown".to_string();
Self {
os: unknown.clone(),
kernel: unknown.clone(),
cpu: unknown.clone(),
core_count: unknown.clone(),
memory: unknown.clone(),
}
}
}
}