Add pixelated Bevy to assets and an example (#6408)

# Objective
Fixes #2279 

## Solution
Added pixelated Bevy to assets folder and used in a `pixel_perfect` example.

Cargo.toml

@@ -262,6 +262,16 @@ description = "Demonstrates transparency in 2d"
 category = "2D Rendering"
 wasm = true
 
+[[example]]
+name = "pixel_perfect"
+path = "examples/2d/pixel_perfect.rs"
+
+[package.metadata.example.pixel_perfect]
+name = "Pixel Perfect"
+description = "Demonstrates pixel perfect in 2d"
+category = "2D Rendering"
+wasm = true
+
 # 3D Rendering
 [[example]]
 name = "3d_scene"

examples/2d/pixel_perfect.rs

@@ -0,0 +1,44 @@
+//! Renders a 2D scene containing pixelated bevy logo in a pixel perfect style
+
+use bevy::prelude::*;
+
+fn main() {
+    App::new()
+        .add_plugins(DefaultPlugins.set(ImagePlugin::default_nearest()))
+        .add_startup_system(setup)
+        .add_system(sprite_movement)
+        .run();
+}
+
+#[derive(Component)]
+enum Direction {
+    Left,
+    Right,
+}
+
+fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
+    commands.spawn(Camera2dBundle::default());
+    commands.spawn((
+        SpriteBundle {
+            texture: asset_server.load("pixel/bevy_pixel_light.png"),
+            transform: Transform::from_xyz(100., 0., 0.),
+            ..default()
+        },
+        Direction::Right,
+    ));
+}
+
+fn sprite_movement(time: Res<Time>, mut sprite_position: Query<(&mut Direction, &mut Transform)>) {
+    for (mut logo, mut transform) in &mut sprite_position {
+        match *logo {
+            Direction::Right => transform.translation.x += 30. * time.delta_seconds(),
+            Direction::Left => transform.translation.x -= 30. * time.delta_seconds(),
+        }
+
+        if transform.translation.x > 200. {
+            *logo = Direction::Left;
+        } else if transform.translation.x < -200. {
+            *logo = Direction::Right;
+        }
+    }
+}

examples/README.md

@@ -93,6 +93,7 @@ Example | Description
 [Mesh 2D](../examples/2d/mesh2d.rs) | Renders a 2d mesh
 [Mesh 2D With Vertex Colors](../examples/2d/mesh2d_vertex_color_texture.rs) | Renders a 2d mesh with vertex color attributes
 [Move Sprite](../examples/2d/move_sprite.rs) | Changes the transform of a sprite
+[Pixel Perfect](../examples/2d/pixel_perfect.rs) | Demonstrates pixel perfect in 2d
 [Sprite](../examples/2d/sprite.rs) | Renders a sprite
 [Sprite Flipping](../examples/2d/sprite_flipping.rs) | Renders a sprite flipped along an axis
 [Sprite Sheet](../examples/2d/sprite_sheet.rs) | Renders an animated sprite