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)
98 lines
2.8 KiB
Rust
98 lines
2.8 KiB
Rust
//! This example illustrates how to create a texture for use with a `texture_2d_array<f32>` shader
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//! uniform variable.
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use bevy::{
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asset::LoadState,
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prelude::*,
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reflect::TypePath,
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render::render_resource::{AsBindGroup, ShaderRef},
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};
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/// This example uses a shader source file from the assets subdirectory
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const SHADER_ASSET_PATH: &str = "shaders/array_texture.wgsl";
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fn main() {
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App::new()
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.add_plugins((
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DefaultPlugins,
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MaterialPlugin::<ArrayTextureMaterial>::default(),
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))
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.add_systems(Startup, setup)
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.add_systems(Update, create_array_texture)
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.run();
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}
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#[derive(Resource)]
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struct LoadingTexture {
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is_loaded: bool,
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handle: Handle<Image>,
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}
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fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
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// Start loading the texture.
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commands.insert_resource(LoadingTexture {
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is_loaded: false,
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handle: asset_server.load("textures/array_texture.png"),
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});
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// light
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commands.spawn(DirectionalLightBundle {
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transform: Transform::from_xyz(3.0, 2.0, 1.0).looking_at(Vec3::ZERO, Vec3::Y),
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..Default::default()
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});
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// camera
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commands.spawn(Camera3dBundle {
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transform: Transform::from_xyz(5.0, 5.0, 5.0).looking_at(Vec3::new(1.5, 0.0, 0.0), Vec3::Y),
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..Default::default()
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});
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}
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fn create_array_texture(
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mut commands: Commands,
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asset_server: Res<AssetServer>,
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mut loading_texture: ResMut<LoadingTexture>,
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mut images: ResMut<Assets<Image>>,
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mut meshes: ResMut<Assets<Mesh>>,
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mut materials: ResMut<Assets<ArrayTextureMaterial>>,
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) {
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if loading_texture.is_loaded
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|| asset_server.load_state(loading_texture.handle.id()) != LoadState::Loaded
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{
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return;
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}
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loading_texture.is_loaded = true;
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let image = images.get_mut(&loading_texture.handle).unwrap();
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// Create a new array texture asset from the loaded texture.
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let array_layers = 4;
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image.reinterpret_stacked_2d_as_array(array_layers);
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// Spawn some cubes using the array texture
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let mesh_handle = meshes.add(Cuboid::default());
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let material_handle = materials.add(ArrayTextureMaterial {
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array_texture: loading_texture.handle.clone(),
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});
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for x in -5..=5 {
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commands.spawn(MaterialMeshBundle {
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mesh: mesh_handle.clone(),
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material: material_handle.clone(),
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transform: Transform::from_xyz(x as f32 + 0.5, 0.0, 0.0),
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..Default::default()
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});
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}
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}
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#[derive(Asset, TypePath, AsBindGroup, Debug, Clone)]
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struct ArrayTextureMaterial {
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#[texture(0, dimension = "2d_array")]
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#[sampler(1)]
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array_texture: Handle<Image>,
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}
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impl Material for ArrayTextureMaterial {
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fn fragment_shader() -> ShaderRef {
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SHADER_ASSET_PATH.into()
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}
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}
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