43 lines
1.5 KiB
Rust
43 lines
1.5 KiB
Rust
//! Shows how to display a window in transparent mode.
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//!
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//! This feature works as expected depending on the platform. Please check the
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//! [documentation](https://docs.rs/bevy/latest/bevy/prelude/struct.Window.html#structfield.transparent)
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//! for more details.
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#[cfg(any(target_os = "macos", target_os = "linux"))]
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use bevy::window::CompositeAlphaMode;
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use bevy::{prelude::*, window::PrimaryWindow};
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fn main() {
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App::new()
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.add_plugins(DefaultPlugins)
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// ClearColor must have 0 alpha, otherwise some color will bleed through
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.insert_resource(ClearColor(Color::NONE))
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.add_observer(configure_window)
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.add_systems(Startup, setup)
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.run();
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}
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fn configure_window(trigger: On<Add, PrimaryWindow>, mut window: Query<&mut Window>) {
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let mut window = window.get_mut(trigger.target()).unwrap();
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// Setting `transparent` allows the `ClearColor`'s alpha value to take effect
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window.transparent = true;
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// Disabling window decorations to make it feel more like a widget than a window
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window.decorations = false;
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#[cfg(target_os = "macos")]
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{
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window.composite_alpha_mode = CompositeAlphaMode::PostMultiplied;
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}
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#[cfg(target_os = "linux")]
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{
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window.composite_alpha_mode = CompositeAlphaMode::PreMultiplied;
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}
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}
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fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
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commands.spawn(Camera2d);
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commands.spawn(Sprite::from_image(asset_server.load("branding/icon.png")));
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}
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