mirror of
https://github.com/bevyengine/bevy
synced 2024-09-20 06:22:01 +00:00
435d9bc02c
The examples won't work when copy-pasted to another project, without also copying their shader files. This change adds constants at the top of the files to bring attention to the dependencies. Follow up to [#13624](https://github.com/bevyengine/bevy/pull/13624#issuecomment-2143872791)
66 lines
1.9 KiB
Rust
66 lines
1.9 KiB
Rust
//! A shader and a material that uses it.
|
|
|
|
use bevy::{
|
|
prelude::*,
|
|
reflect::TypePath,
|
|
render::render_resource::{AsBindGroup, ShaderRef},
|
|
};
|
|
|
|
/// This example uses a shader source file from the assets subdirectory
|
|
const SHADER_ASSET_PATH: &str = "shaders/custom_material.wgsl";
|
|
|
|
fn main() {
|
|
App::new()
|
|
.add_plugins((DefaultPlugins, MaterialPlugin::<CustomMaterial>::default()))
|
|
.add_systems(Startup, setup)
|
|
.run();
|
|
}
|
|
|
|
/// set up a simple 3D scene
|
|
fn setup(
|
|
mut commands: Commands,
|
|
mut meshes: ResMut<Assets<Mesh>>,
|
|
mut materials: ResMut<Assets<CustomMaterial>>,
|
|
asset_server: Res<AssetServer>,
|
|
) {
|
|
// cube
|
|
commands.spawn(MaterialMeshBundle {
|
|
mesh: meshes.add(Cuboid::default()),
|
|
transform: Transform::from_xyz(0.0, 0.5, 0.0),
|
|
material: materials.add(CustomMaterial {
|
|
color: LinearRgba::BLUE,
|
|
color_texture: Some(asset_server.load("branding/icon.png")),
|
|
alpha_mode: AlphaMode::Blend,
|
|
}),
|
|
..default()
|
|
});
|
|
|
|
// camera
|
|
commands.spawn(Camera3dBundle {
|
|
transform: Transform::from_xyz(-2.0, 2.5, 5.0).looking_at(Vec3::ZERO, Vec3::Y),
|
|
..default()
|
|
});
|
|
}
|
|
|
|
// This struct defines the data that will be passed to your shader
|
|
#[derive(Asset, TypePath, AsBindGroup, Debug, Clone)]
|
|
struct CustomMaterial {
|
|
#[uniform(0)]
|
|
color: LinearRgba,
|
|
#[texture(1)]
|
|
#[sampler(2)]
|
|
color_texture: Option<Handle<Image>>,
|
|
alpha_mode: AlphaMode,
|
|
}
|
|
|
|
/// The Material trait is very configurable, but comes with sensible defaults for all methods.
|
|
/// You only need to implement functions for features that need non-default behavior. See the Material api docs for details!
|
|
impl Material for CustomMaterial {
|
|
fn fragment_shader() -> ShaderRef {
|
|
SHADER_ASSET_PATH.into()
|
|
}
|
|
|
|
fn alpha_mode(&self) -> AlphaMode {
|
|
self.alpha_mode
|
|
}
|
|
}
|