Bevy 0.12 2d Repeating Image

repeat.rs

use bevy::{
    prelude::*,
    render::{
        mesh::VertexAttributeValues,
        texture::{ImageAddressMode, ImageLoaderSettings, ImageSampler, ImageSamplerDescriptor},
    },
    sprite::MaterialMesh2dBundle,
};

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .add_systems(Startup, setup)
        .run();
}

fn setup(
    mut commands: Commands,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<ColorMaterial>>,
    asset_server: Res<AssetServer>,
) {
    commands.spawn(Camera2dBundle::default());

    let texture = Some(asset_server.load_with_settings(
        "branding/icon.png",
        |s: &mut ImageLoaderSettings| match &mut s.sampler {
            ImageSampler::Default => {
                s.sampler = ImageSampler::Descriptor(ImageSamplerDescriptor {
                    address_mode_u: ImageAddressMode::Repeat,
                    address_mode_v: ImageAddressMode::Repeat,
                    ..default()
                });
            }
            ImageSampler::Descriptor(sampler) => {
                sampler.address_mode_u = ImageAddressMode::Repeat;
                sampler.address_mode_v = ImageAddressMode::Repeat;
            }
        },
    ));

    commands.spawn(MaterialMesh2dBundle {
        mesh: meshes.add(repeating_quad(10.)).into(),
        material: materials.add(ColorMaterial {
            texture,
            ..default()
        }),
        transform: Transform::from_translation(Vec3::new(0., 0., -10.))
            .with_scale(Vec2::splat(1000.).extend(1.)),
        ..default()
    });
}

fn repeating_quad(n: f32) -> Mesh {
    let mut mesh: Mesh = shape::Quad::default().into();
    let uv_attribute = mesh.attribute_mut(Mesh::ATTRIBUTE_UV_0).unwrap();
    // The format of the UV coordinates should be Float32x2.
    let VertexAttributeValues::Float32x2(uv_attribute) = uv_attribute else {
        panic!("Unexpected vertex format, expected Float32x2.");
    };
    // The default `Quad`'s texture coordinates are in the range of `0..=1`. Values outside
    // this range cause the texture to repeat.
    for uv_coord in uv_attribute.iter_mut() {
        uv_coord[0] = uv_coord[0] * n;
        uv_coord[1] = uv_coord[1] * n;
    }

    mesh
}