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bevy/examples/asset/asset_settings.rs

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//! This example demonstrates the usage of '.meta' files and [`AssetServer::load_with_settings`] to override the default settings for loading an asset
use bevy::{
image::{ImageLoaderSettings, ImageSampler},
prelude::*,
};
fn main() {
App::new()
.add_plugins(
// This just tells the asset server to look in the right examples folder
DefaultPlugins.set(AssetPlugin {
file_path: "examples/asset/files".to_string(),
..Default::default()
}),
)
.add_systems(Startup, setup)
.run();
}
fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
// Without any .meta file specifying settings, the default sampler [ImagePlugin::default()] is used for loading images.
// If you are using a very small image and rendering it larger like seen here, the default linear filtering will result in a blurry image.
// Useful note: The default sampler specified by the ImagePlugin is *not* the same as the default implementation of sampler. This is why
// everything uses linear by default but if you look at the default of sampler, it uses nearest.
commands.spawn((
Sprite {
image: asset_server.load("bevy_pixel_dark.png"),
custom_size: Some(Vec2 { x: 160.0, y: 120.0 }),
..Default::default()
},
Transform::from_xyz(-100.0, 0.0, 0.0),
));
// When a .meta file is added with the same name as the asset and a '.meta' extension
// you can (and must) specify all fields of the asset loader's settings for that
// particular asset, in this case [ImageLoaderSettings]. Take a look at
// examples/asset/files/bevy_pixel_dark_with_meta.png.meta
// for the format and you'll notice, the only non-default option is setting Nearest
// filtering. This tends to work much better for pixel art assets.
// A good reference when filling this out is to check out [ImageLoaderSettings::default()]
// and follow to the default implementation of each fields type.
// https://docs.rs/bevy/latest/bevy/render/texture/struct.ImageLoaderSettings.html#
commands.spawn((
Sprite {
image: asset_server.load("bevy_pixel_dark_with_meta.png"),
custom_size: Some(Vec2 { x: 160.0, y: 120.0 }),
..Default::default()
},
Transform::from_xyz(100.0, 0.0, 0.0),
));
// Another option is to use the AssetServers load_with_settings function.
// With this you can specify the same settings upon loading your asset with a
// couple of differences. A big one is that you aren't required to set *every*
// setting, just modify the ones that you need. It works by passing in a function
// (in this case an anonymous closure) that takes a reference to the settings type
// that is then modified in the function.
// Do note that if you want to load the same asset with different settings, the
// settings changes from any loads after the first of the same asset will be ignored.
// This is why this one loads a differently named copy of the asset instead of using
// same one as without a .meta file.
commands.spawn((
Sprite {
image: asset_server.load_with_settings(
"bevy_pixel_dark_with_settings.png",
|settings: &mut ImageLoaderSettings| {
settings.sampler = ImageSampler::nearest();
},
),
custom_size: Some(Vec2 { x: 160.0, y: 120.0 }),
..Default::default()
},
Transform::from_xyz(0.0, 150.0, 0.0),
));
commands.spawn(Camera2d);
}