Bevy Blur Regions

A Bevy plugin to selectively blur regions of the screen.

Usage

Add the plugin:

use bevy::prelude::*;
use bevy_blur_regions::prelude::*;

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .add_plugins(BlurRegionsPlugin::default())
        .run();
}

Add the BlurRegionsCamera component to the 3D camera whose output should be blurred:

commands.spawn((
    BlurRegionsCamera::default(),
    Camera3dBundle::default(),
));

When using Bevy UI, add the BlurRegion marker component to any Bevy UI nodes which should have a blurry background:

commands.spawn((
    BlurRegion,
    NodeBundle {
        style: Style {
            width: Val::Percent(50.0),
            height: Val::Percent(50.0),
            left: Val::Percent(25.0),
            top: Val::Percent(25.0),
            ..default()
        },
        ..default()
    },
));

When using egui, enable the egui feature and then use the show_with_blur function instead of show when adding contents to an egui window:

fn draw_ui(
    mut contexts: EguiContexts,
    mut blur_region_cameras: Query<&mut bevy_blur_regions::DefaultBlurRegionsCamera>)
{
    let mut blur_regions = blur_region_cameras.single_mut();

    let frame = egui::Frame::window(&contexts.ctx_mut().style())
        .fill(egui::Color32::from_rgba_premultiplied(27, 27, 27, 100))
        .rounding(0.0)
        .shadow(egui::epaint::Shadow::NONE);

    egui::Window::new("Blurry Window")
        .frame(frame)
        .show_with_blur(egui::Id::new("Blurry Window"), &mut blur_regions, contexts.ctx_mut(), |ui| {
            ui.label("This window has a nice blurry background.")
        });
}

For other use cases, the immediate mode blurring api can be called each frame:

fn update(mut blur_region_cameras: Query<&mut BlurRegionsCamera>) {
    let Ok(mut blur_regions) = blur_region_cameras.get_single_mut() else {
        return;
    };
    blur_regions.blur(Rect::from_center_size(vec2(100.0, 100.0), vec2(200.0, 200.0)));
}

See the examples for working implementations of all of the above.

Caveats

The number of blur regions is limited

The number of blur regions that can be present on the screen at the same time is limited to 20.

License

All code in this repository is dual-licensed under either:

MIT License (LICENSE-MIT or http://opensource.org/licenses/MIT)
Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)

at your option. This means you can select the license you prefer.