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[Merged by Bors] - Slight perf improvements and tidy for bevymark #3765

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a774329
Slight perf improvements and tidy for bevymark
SUPERCILEX Jan 25, 2022
0d2bebc
Rename random to rng
SUPERCILEX Jan 25, 2022
6e6158c
Smush imports together
SUPERCILEX Jan 25, 2022
16622b3
Only update counter when changed
SUPERCILEX Jan 26, 2022
d2f67e9
Add note about for_each being faster
SUPERCILEX Feb 24, 2022
bcb1a44
Merge remote-tracking branch 'upstream/main' into tmp
SUPERCILEX Feb 25, 2022
87dc4d0
Address review feedback
SUPERCILEX Feb 25, 2022
0db3cdc
Oops, add back for_each comment
SUPERCILEX Feb 25, 2022
212c401
Use usize instead of u128 so math isn't emulated
SUPERCILEX Feb 25, 2022
a2374b4
Update examples/tools/bevymark.rs
SUPERCILEX Feb 25, 2022
f5c015e
Update examples/tools/bevymark.rs
SUPERCILEX Feb 25, 2022
3146c53
Disable vsync
SUPERCILEX Feb 25, 2022
0e3a0d3
Address feedback
SUPERCILEX Feb 27, 2022
37a8120
remove old comment
cart Feb 28, 2022
ddd219a
Go back to iter
SUPERCILEX Feb 28, 2022
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126 changes: 72 additions & 54 deletions examples/tools/bevymark.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,8 @@ use bevy::{
diagnostic::{Diagnostics, FrameTimeDiagnosticsPlugin, LogDiagnosticsPlugin},
prelude::*,
};
use rand::random;
use rand::{thread_rng, Rng};
use std::fmt::Write;

const BIRDS_PER_SECOND: u32 = 10000;
const _BASE_COLOR: Color = Color::rgb(5.0, 5.0, 5.0);
Expand Down Expand Up @@ -72,67 +73,74 @@ fn scheduled_spawner(
scheduled.per_wave,
bird_texture.0.clone_weak(),
);
counter.color = Color::rgb_linear(random(), random(), random());

let mut rng = thread_rng();
counter.color = Color::rgb_linear(rng.gen(), rng.gen(), rng.gen());
scheduled.wave -= 1;
}
}

struct BirdTexture(Handle<Image>);

#[derive(Component)]
struct StatsText;

fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
let texture = asset_server.load("branding/icon.png");

commands.spawn_bundle(OrthographicCameraBundle::new_2d());
commands.spawn_bundle(UiCameraBundle::default());
commands.spawn_bundle(TextBundle {
text: Text {
sections: vec![
TextSection {
value: "Bird Count: ".to_string(),
style: TextStyle {
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
font_size: 40.0,
color: Color::rgb(0.0, 1.0, 0.0),
commands
.spawn_bundle(TextBundle {
text: Text {
sections: vec![
TextSection {
value: "Bird Count: ".to_string(),
style: TextStyle {
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
font_size: 40.0,
color: Color::rgb(0.0, 1.0, 0.0),
},
},
},
TextSection {
value: "".to_string(),
style: TextStyle {
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
font_size: 40.0,
color: Color::rgb(0.0, 1.0, 1.0),
TextSection {
value: "".to_string(),
style: TextStyle {
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
font_size: 40.0,
color: Color::rgb(0.0, 1.0, 1.0),
},
},
},
TextSection {
value: "\nAverage FPS: ".to_string(),
style: TextStyle {
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
font_size: 40.0,
color: Color::rgb(0.0, 1.0, 0.0),
TextSection {
value: "\nAverage FPS: ".to_string(),
style: TextStyle {
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
font_size: 40.0,
color: Color::rgb(0.0, 1.0, 0.0),
},
},
},
TextSection {
value: "".to_string(),
style: TextStyle {
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
font_size: 40.0,
color: Color::rgb(0.0, 1.0, 1.0),
TextSection {
value: "".to_string(),
style: TextStyle {
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
font_size: 40.0,
color: Color::rgb(0.0, 1.0, 1.0),
},
},
],
..Default::default()
},
style: Style {
position_type: PositionType::Absolute,
position: Rect {
top: Val::Px(5.0),
left: Val::Px(5.0),
..Default::default()
},
],
..Default::default()
},
style: Style {
position_type: PositionType::Absolute,
position: Rect {
top: Val::Px(5.0),
left: Val::Px(5.0),
..Default::default()
},
..Default::default()
},
..Default::default()
});
})
.insert(StatsText);

commands.insert_resource(BirdTexture(texture));
commands.insert_resource(BirdScheduled {
Expand All @@ -156,7 +164,8 @@ fn mouse_handler(
mut counter: ResMut<BevyCounter>,
) {
if mouse_button_input.just_released(MouseButton::Left) {
counter.color = Color::rgb_linear(random(), random(), random());
let mut rng = thread_rng();
counter.color = Color::rgb_linear(rng.gen(), rng.gen(), rng.gen());
}

if mouse_button_input.pressed(MouseButton::Left) {
Expand All @@ -181,6 +190,8 @@ fn spawn_birds(
let window = windows.get_primary().unwrap();
let bird_x = (window.width() as f32 / -2.) + HALF_BIRD_SIZE;
let bird_y = (window.height() as f32 / 2.) - HALF_BIRD_SIZE;
let mut rng = thread_rng();

for count in 0..spawn_count {
let bird_z = (counter.count + count) as f32 * 0.00001;
commands
Expand All @@ -199,7 +210,7 @@ fn spawn_birds(
})
.insert(Bird {
velocity: Vec3::new(
rand::random::<f32>() * MAX_VELOCITY - (MAX_VELOCITY * 0.5),
rng.gen::<f32>() * MAX_VELOCITY - (MAX_VELOCITY * 0.5),
0.,
0.,
),
Expand All @@ -209,19 +220,21 @@ fn spawn_birds(
}

fn movement_system(time: Res<Time>, mut bird_query: Query<(&mut Bird, &mut Transform)>) {
for (mut bird, mut transform) in bird_query.iter_mut() {
// Use for_each style iteration here and in the collision_system because it's faster thanks to
// better LLVM optimization opportunities (see transrangers) and hoisted branching.
bird_query.for_each_mut(|(mut bird, mut transform)| {
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@alice-i-cecile alice-i-cecile Jan 25, 2022

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I think that using the for_each pattern here is worth it, but we should explain to beginners that this is faster (and ideally link to an explanation why).

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@SUPERCILEX SUPERCILEX Jan 25, 2022 •
edited
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Agreed, I'd actually love to know why this is faster. This PR added it and said it was faster but not why.

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@SUPERCILEX SUPERCILEX Feb 24, 2022

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Added a note, though I have no idea if it's correct. 😅

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@rparrett rparrett Feb 25, 2022 •
edited
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I can't comment on the correctness of that note, but I feel like something like

// `.for_each_mut` is faster than `.iter`, but can't be chained like a normal iterator.

would be enough. (based on text here https://docs.rs/bevy/latest/bevy/ecs/system/struct.Query.html#method.for_each_mut)

transform.translation.x += bird.velocity.x * time.delta_seconds();
transform.translation.y += bird.velocity.y * time.delta_seconds();
bird.velocity.y += GRAVITY * time.delta_seconds();
}
});
}

fn collision_system(windows: Res<Windows>, mut bird_query: Query<(&mut Bird, &Transform)>) {
let window = windows.get_primary().unwrap();
let half_width = window.width() as f32 * 0.5;
let half_height = window.height() as f32 * 0.5;

for (mut bird, transform) in bird_query.iter_mut() {
bird_query.for_each_mut(|(mut bird, transform)| {
let x_vel = bird.velocity.x;
let y_vel = bird.velocity.y;
let x_pos = transform.translation.x;
Expand All @@ -238,20 +251,25 @@ fn collision_system(windows: Res<Windows>, mut bird_query: Query<(&mut Bird, &Tr
if y_pos + HALF_BIRD_SIZE > half_height && y_vel > 0.0 {
bird.velocity.y = 0.0;
}
}
});
}

fn counter_system(
diagnostics: Res<Diagnostics>,
counter: Res<BevyCounter>,
mut query: Query<&mut Text>,
mut query: Query<&mut Text, With<StatsText>>,
) {
let mut text = query.single_mut();

if counter.is_changed() {
text.sections[1].value.clear();
write!(text.sections[1].value, "{}", counter.count).unwrap();
}

if let Some(fps) = diagnostics.get(FrameTimeDiagnosticsPlugin::FPS) {
if let Some(average) = fps.average() {
for mut text in query.iter_mut() {
text.sections[1].value = format!("{}", counter.count);
text.sections[3].value = format!("{:.2}", average);
}
text.sections[3].value.clear();
write!(text.sections[3].value, "{:.2}", average).unwrap();
}
};
}