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texture atlas example: mark each loaded image as CPU persistent #11202

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texture atlas example: mark each loaded image as CPU persistent #11202

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18 changes: 16 additions & 2 deletions examples/2d/texture_atlas.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -7,14 +7,18 @@
//! Only one padded and one unpadded texture atlas are rendered to the screen.
//! An upscaled sprite from each of the four atlases are rendered to the screen.

use bevy::{asset::LoadedFolder, prelude::*, render::texture::ImageSampler};
use bevy::{
asset::LoadedFolder,
prelude::*,
render::{render_asset::RenderAssetPersistencePolicy, texture::ImageSampler},
};

fn main() {
App::new()
.add_plugins(DefaultPlugins.set(ImagePlugin::default_nearest())) // fallback to nearest sampling
.init_state::<AppState>()
.add_systems(OnEnter(AppState::Setup), load_textures)
.add_systems(Update, check_textures.run_if(in_state(AppState::Setup)))
.add_systems(Last, check_textures.run_if(in_state(AppState::Setup)))
.add_systems(OnEnter(AppState::Finished), setup)
.run();
}
Expand All @@ -38,7 +42,17 @@ fn check_textures(
mut next_state: ResMut<NextState<AppState>>,
rpg_sprite_folder: Res<RpgSpriteFolder>,
mut events: EventReader<AssetEvent<LoadedFolder>>,
mut textures: ResMut<Assets<Image>>,
mut image_events: EventReader<AssetEvent<Image>>,
) {
// Mark loaded images as CPU persistent so that they can be used to build the texture atlas.
for image_event in image_events.read() {
if let AssetEvent::Added { id } = image_event {
let image = textures.get_mut(*id).unwrap();
image.cpu_persistent_access = RenderAssetPersistencePolicy::Keep;
}
}

// Advance the `AppState` once all sprite handles have been loaded by the `AssetServer`
// and that the the font has been loaded by the `FontSystem`.
for event in events.read() {
Expand Down