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Use Commands::spawn_batch in bevymark example (#7738)

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# Objective

Fixes #7735

## Solution

Use `spawn_batch` instead of `spawn` repeatedly in a for loop

I have decided to switch from using rands `thread_rng()` to its `StdRng`,  this allows us to avoid calling `collect()` on the bundle iterator, if collecting is fine then I can revert it back to using `thread_rng()`.
This commit is contained in:
Liam Gallagher 2023-02-19 03:26:11 +00:00
parent 9b7060c4d2
commit 5a66d035e2
1 changed files with 15 additions and 16 deletions
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31
examples/stress_tests/bevymark.rs
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@ -7,7 +7,7 @@ use bevy::{
prelude::*,
window::{PresentMode, WindowResolution},
};
use rand::{thread_rng, Rng};
use rand::{rngs::StdRng, thread_rng, Rng, SeedableRng};
const BIRDS_PER_SECOND: u32 = 10000;
const GRAVITY: f32 = -9.8 * 100.0;
@ -178,11 +178,16 @@ fn spawn_birds(
) {
let bird_x = (primary_window_resolution.width() / -2.) + HALF_BIRD_SIZE;
let bird_y = (primary_window_resolution.height() / 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.spawn((
let mut rng = StdRng::from_entropy();
let color = counter.color;
let current_count = counter.count;
commands.spawn_batch((0..spawn_count).map(move |count| {
let velocity_x = rng.gen::<f32>() * MAX_VELOCITY - (MAX_VELOCITY * 0.5);
let bird_z = (current_count + count) as f32 * 0.00001;
(
SpriteBundle {
texture: texture.clone(),
transform: Transform {
@ -190,21 +195,15 @@ fn spawn_birds(
scale: Vec3::splat(BIRD_SCALE),
..default()
},
sprite: Sprite {
color: counter.color,
..default()
},
sprite: Sprite { color, ..default() },
..default()
},
Bird {
velocity: Vec3::new(
rng.gen::<f32>() * MAX_VELOCITY - (MAX_VELOCITY * 0.5),
0.,
0.,
),
velocity: Vec3::new(velocity_x, 0., 0.),
},
));
}
)
}));
counter.count += spawn_count;
}