Vendor dependencies for 0.3.0 release

vendor/bevy/examples/2d/transparency_2d.rs

@@ -0,0 +1,39 @@
+//! Demonstrates how to use transparency in 2D.
+//! Shows 3 bevy logos on top of each other, each with a different amount of transparency.
+
+use bevy::prelude::*;
+
+fn main() {
+    App::new()
+        .add_plugins(DefaultPlugins)
+        .add_systems(Startup, setup)
+        .run();
+}
+
+fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
+    commands.spawn(Camera2d);
+
+    let sprite_handle = asset_server.load("branding/icon.png");
+
+    commands.spawn((
+        Sprite::from_image(sprite_handle.clone()),
+        Transform::from_xyz(-100.0, 0.0, 0.0),
+    ));
+    commands.spawn((
+        Sprite {
+            image: sprite_handle.clone(),
+            // Alpha channel of the color controls transparency.
+            color: Color::srgba(0.0, 0.0, 1.0, 0.7),
+            ..default()
+        },
+        Transform::from_xyz(0.0, 0.0, 0.1),
+    ));
+    commands.spawn((
+        Sprite {
+            image: sprite_handle,
+            color: Color::srgba(0.0, 1.0, 0.0, 0.3),
+            ..default()
+        },
+        Transform::from_xyz(100.0, 0.0, 0.2),
+    ));
+}