5243fe6956
# Objective This `apply_deferred` doesn't seem to have any effect, pointlessly restricts parallelism and is responsible for a large number of system order ambiguities. Spotted as part of #7386. ## Solution Remove it. This is the *only* manual apply_deferred in the code base currently. ## Testing I've checked various UI examples and `split_screen`, and couldn't discern any difference. This looks like a remnant of a `(a, apply_deferred, b).chain()` pattern where `b` got removed, leaving us with a weird vestige.
83 lines
3.0 KiB
Rust
83 lines
3.0 KiB
Rust
//! A test to confirm that `bevy` doesn't regress its system ambiguities count when using [`DefaultPlugins`].
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//! This is run in CI.
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//!
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//! Note that because this test requires rendering, it isn't actually an integration test!
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//! Instead, it's secretly an example: you can run this test manually using `cargo run --example ambiguity_detection`.
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use bevy::{
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ecs::schedule::{InternedScheduleLabel, LogLevel, ScheduleBuildSettings},
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prelude::*,
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utils::HashMap,
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};
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use bevy_render::{pipelined_rendering::RenderExtractApp, RenderApp};
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fn main() {
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let mut app = App::new();
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app.add_plugins(DefaultPlugins);
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let sub_app = app.main_mut();
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configure_ambiguity_detection(sub_app);
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let sub_app = app.sub_app_mut(RenderApp);
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configure_ambiguity_detection(sub_app);
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let sub_app = app.sub_app_mut(RenderExtractApp);
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configure_ambiguity_detection(sub_app);
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app.finish();
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app.cleanup();
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app.update();
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let main_app_ambiguities = count_ambiguities(app.main());
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assert_eq!(
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main_app_ambiguities.total(),
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// This number *should* be zero.
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// Over time, we are working to reduce the number: your PR should not increase it.
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// If you decrease this by fixing an ambiguity, reduce the number to prevent regressions.
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// See https://github.com/bevyengine/bevy/issues/7386 for progress.
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48,
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"Main app has unexpected ambiguities among the following schedules: \n{:#?}.",
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main_app_ambiguities,
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);
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// RenderApp is not checked here, because it is not within the App at this point.
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let render_extract_ambiguities = count_ambiguities(app.sub_app(RenderExtractApp));
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assert_eq!(
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render_extract_ambiguities.total(),
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0,
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"RenderExtract app has unexpected ambiguities among the following schedules: \n{:#?}",
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render_extract_ambiguities,
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);
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}
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/// Contains the number of conflicting systems per schedule.
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#[derive(Debug, Deref, DerefMut)]
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struct AmbiguitiesCount(pub HashMap<InternedScheduleLabel, usize>);
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impl AmbiguitiesCount {
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fn total(&self) -> usize {
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self.values().sum()
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}
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}
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fn configure_ambiguity_detection(sub_app: &mut SubApp) {
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let mut schedules = sub_app.world_mut().resource_mut::<Schedules>();
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for (_, schedule) in schedules.iter_mut() {
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schedule.set_build_settings(ScheduleBuildSettings {
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// NOTE: you can change this to `LogLevel::Ignore` to easily see the current number of ambiguities.
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ambiguity_detection: LogLevel::Warn,
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use_shortnames: false,
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..default()
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});
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}
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}
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/// Returns the number of conflicting systems per schedule.
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fn count_ambiguities(sub_app: &SubApp) -> AmbiguitiesCount {
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let schedules = sub_app.world().resource::<Schedules>();
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let mut ambiguities = HashMap::new();
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for (_, schedule) in schedules.iter() {
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let ambiguities_in_schedule = schedule.graph().conflicting_systems().len();
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ambiguities.insert(schedule.label(), ambiguities_in_schedule);
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}
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AmbiguitiesCount(ambiguities)
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}
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