bevy_sprite3d 9.0.0

use bevy::prelude::*;
use bevy_sprite3d::prelude::*;

#[derive(States, Hash, Clone, PartialEq, Eq, Debug, Default)] #[rustfmt::skip]
enum GameState { #[default] Loading, Ready }

#[derive(Resource, Default)]
struct Assets(Handle<Image>);

fn main()
{
    #[rustfmt::skip]
    App::new().add_plugins(DefaultPlugins)
              .add_plugins(Sprite3dPlugin)
              .init_state::<GameState>()
              // initially load assets
              .add_systems(Startup, |asset_server: Res<AssetServer>, mut assets: ResMut<Assets>| {
                  assets.0 = asset_server.load("icon.png");
              })
              // run `setup` every frame while loading. Once it detects the right
              // conditions it'll switch to the next state.
              .add_systems(Update, setup.run_if(in_state(GameState::Loading)))
              .insert_resource(Assets::default())
              .run();
}

#[rustfmt::skip]
fn setup(
    asset_server      : Res<AssetServer>,
    assets            : Res<Assets>,
    mut commands      : Commands,
    mut next_state    : ResMut<NextState<GameState>>,
) {
    // poll every frame to check if assets are loaded. Once they are, we can proceed with setup.
    if !asset_server.get_load_state(assets.0.id()).is_some_and(|s| s.is_loaded()) { return; }

    next_state.set(GameState::Ready);

    // -----------------------------------------------------------------------

    commands.spawn(Camera3d::default()).insert(Transform::from_xyz(0., 0., 5.));

    // ----------------------- Spawn a 3D sprite -----------------------------

    commands.spawn((Sprite3d { pixels_per_metre: 400.,
                               alpha_mode: AlphaMode::Blend,
                               unlit: true,
                               // pivot: Some(Vec2::new(0.5, 0.5)),
                               ..default() },

                    Sprite { image: assets.0.clone(), ..default() }));

    // -----------------------------------------------------------------------
}