shader_material/
shader_material.rs

1//! A shader and a material that uses it.
2
3use bevy::{
4    prelude::*, reflect::TypePath, render::render_resource::AsBindGroup, shader::ShaderRef,
5};
6
7/// This example uses a shader source file from the assets subdirectory
8const SHADER_ASSET_PATH: &str = "shaders/custom_material.wgsl";
9
10fn main() {
11    App::new()
12        .add_plugins((DefaultPlugins, MaterialPlugin::<CustomMaterial>::default()))
13        .add_systems(Startup, setup)
14        .run();
15}
16
17/// set up a simple 3D scene
18fn setup(
19    mut commands: Commands,
20    mut meshes: ResMut<Assets<Mesh>>,
21    mut materials: ResMut<Assets<CustomMaterial>>,
22    asset_server: Res<AssetServer>,
23) {
24    // cube
25    commands.spawn((
26        Mesh3d(meshes.add(Cuboid::default())),
27        MeshMaterial3d(materials.add(CustomMaterial {
28            color: LinearRgba::BLUE,
29            color_texture: Some(asset_server.load("branding/icon.png")),
30            alpha_mode: AlphaMode::Blend,
31        })),
32        Transform::from_xyz(0.0, 0.5, 0.0),
33    ));
34
35    // camera
36    commands.spawn((
37        Camera3d::default(),
38        Transform::from_xyz(-2.0, 2.5, 5.0).looking_at(Vec3::ZERO, Vec3::Y),
39    ));
40}
41
42// This struct defines the data that will be passed to your shader
43#[derive(Asset, TypePath, AsBindGroup, Debug, Clone)]
44struct CustomMaterial {
45    #[uniform(0)]
46    color: LinearRgba,
47    #[texture(1)]
48    #[sampler(2)]
49    color_texture: Option<Handle<Image>>,
50    alpha_mode: AlphaMode,
51}
52
53/// The Material trait is very configurable, but comes with sensible defaults for all methods.
54/// You only need to implement functions for features that need non-default behavior. See the Material api docs for details!
55impl Material for CustomMaterial {
56    fn fragment_shader() -> ShaderRef {
57        SHADER_ASSET_PATH.into()
58    }
59
60    fn alpha_mode(&self) -> AlphaMode {
61        self.alpha_mode
62    }
63}
shader_material/shader_material.rs

shader_material/
shader_material.rs
