This example is running in WebGL2 and should work in most browsers. You can check the WebGPU examples here.
transparency_ui.rs:
//! Demonstrates how to use transparency with UI.
//! Shows two colored buttons with transparent text.
use bevy::prelude::*;
fn main() {
App::new()
.insert_resource(ClearColor(Color::BLACK))
.add_plugins(DefaultPlugins)
.add_systems(Startup, setup)
.run();
}
fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
commands.spawn(Camera2dBundle::default());
let font_handle = asset_server.load("fonts/FiraSans-Bold.ttf");
commands
.spawn(NodeBundle {
style: Style {
width: Val::Percent(100.0),
height: Val::Percent(100.0),
align_items: AlignItems::Center,
justify_content: JustifyContent::SpaceAround,
..default()
},
..default()
})
.with_children(|parent| {
parent
.spawn(ButtonBundle {
style: Style {
width: Val::Px(150.0),
height: Val::Px(65.0),
justify_content: JustifyContent::Center,
align_items: AlignItems::Center,
..default()
},
background_color: Color::srgb(0.1, 0.5, 0.1).into(),
..default()
})
.with_children(|parent| {
parent.spawn(TextBundle::from_section(
"Button 1",
TextStyle {
font: font_handle.clone(),
font_size: 40.0,
// Alpha channel of the color controls transparency.
color: Color::srgba(1.0, 1.0, 1.0, 0.2),
},
));
});
// Button with a different color,
// to demonstrate the text looks different due to its transparency.
parent
.spawn(ButtonBundle {
style: Style {
width: Val::Px(150.0),
height: Val::Px(65.0),
justify_content: JustifyContent::Center,
align_items: AlignItems::Center,
..default()
},
background_color: Color::srgb(0.5, 0.1, 0.5).into(),
..default()
})
.with_children(|parent| {
parent.spawn(TextBundle::from_section(
"Button 2",
TextStyle {
font: font_handle.clone(),
font_size: 40.0,
// Alpha channel of the color controls transparency.
color: Color::srgba(1.0, 1.0, 1.0, 0.2),
},
));
});
});
}