bevy/examples/3d/msaa.rs

//! This example shows how to configure Multi-Sample Anti-Aliasing. Setting the sample count higher
//! will result in smoother edges, but it will also increase the cost to render those edges. The
//! range should generally be somewhere between 1 (no multi sampling, but cheap) to 8 (crisp but
//! expensive).
//! Note that web currently only supports 1 or 4 samples.

use bevy::prelude::*;

fn main() {
    App::new()
        .insert_resource(Msaa::default())
        .add_plugins(DefaultPlugins)
        .add_systems((setup.on_startup(), cycle_msaa))
        .run();
}

/// set up a simple 3D scene
fn setup(
    mut commands: Commands,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<StandardMaterial>>,
) {
    info!("Press '1/2/4/8' respectively to set MSAA sample count");
    info!("Using 4x MSAA");

    // cube
    commands.spawn(PbrBundle {
        mesh: meshes.add(Mesh::from(shape::Cube { size: 2.0 })),
        material: materials.add(Color::rgb(0.8, 0.7, 0.6).into()),
        ..default()
    });
    // light
    commands.spawn(PointLightBundle {
        transform: Transform::from_xyz(4.0, 8.0, 4.0),
        ..default()
    });
    // camera
    commands.spawn(Camera3dBundle {
        transform: Transform::from_xyz(-3.0, 3.0, 5.0).looking_at(Vec3::ZERO, Vec3::Y),
        ..default()
    });
}

fn cycle_msaa(input: Res<Input<KeyCode>>, mut msaa: ResMut<Msaa>) {
    if input.just_pressed(KeyCode::Key1) {
        info!("Not using MSAA");
        *msaa = Msaa::Off;
    }

    if input.just_pressed(KeyCode::Key2) {
        info!("Using 2x MSAA");
        *msaa = Msaa::Sample2;
    }

    if input.just_pressed(KeyCode::Key4) {
        info!("Using 4x MSAA");
        *msaa = Msaa::Sample4;
    }

    if input.just_pressed(KeyCode::Key8) {
        info!("Using 8x MSAA");
        *msaa = Msaa::Sample8;
    }
}