WIP: Dungeon example

Cargo.toml

@@ -15,6 +15,7 @@ bevy = { version = "0.13", default-features = false, features = [
     "bevy_core_pipeline",
     "bevy_winit",
     "bevy_sprite",
+    "png",
     "x11"
 ] }
 

examples/dungeon.rs

@@ -0,0 +1,72 @@
+use bevy::prelude::*;
+use bevy_light_2d::prelude::*;
+
+fn main() {
+    App::new()
+        .add_plugins((DefaultPlugins, Light2dPlugin))
+        .init_resource::<DungeonTileset>()
+        .add_systems(Startup, setup_camera)
+        .add_systems(Startup, (setup_dungeon_tileset, spawn_walls).chain())
+        .run()
+}
+
+#[derive(Resource, Default)]
+struct DungeonTileset {
+    layout: Handle<TextureAtlasLayout>,
+    texture: Handle<Image>,
+}
+
+fn setup_camera(mut commands: Commands) {
+    commands.spawn(Camera2dBundle::default());
+}
+
+fn spawn_walls(commands: Commands, tileset: Res<DungeonTileset>) {
+    spawn_from_atlas(
+        commands,
+        Vec3::splat(0.0),
+        TOP_WALL_A,
+        tileset.layout.clone(),
+        tileset.texture.clone(),
+    );
+}
+
+fn spawn_from_atlas(
+    mut commands: Commands,
+    translation: Vec3,
+    sprite_index: usize,
+    atlas_handle: Handle<TextureAtlasLayout>,
+    texture: Handle<Image>,
+) {
+    commands.spawn(SpriteSheetBundle {
+        transform: Transform {
+            translation,
+            ..default()
+        },
+        texture,
+        atlas: TextureAtlas {
+            index: sprite_index,
+            layout: atlas_handle,
+        },
+        ..default()
+    });
+}
+
+fn setup_dungeon_tileset(
+    asset_server: Res<AssetServer>,
+    mut texture_atlas_layouts: ResMut<Assets<TextureAtlasLayout>>,
+    mut dungeon_tileset: ResMut<DungeonTileset>,
+) {
+    dungeon_tileset.texture = asset_server.load("dungeon_tiles.png");
+    dungeon_tileset.layout = texture_atlas_layouts.add(TextureAtlasLayout::from_grid(
+        Vec2::new(16.0, 16.0),
+        10,
+        10,
+        None,
+        None,
+    ));
+}
+
+const TOP_WALL_A: usize = 1;
+const TOP_WALL_B: usize = 2;
+const TOP_WALL_C: usize = 3;
+const TOP_WALL_D: usize = 4;