load a skybox with stars

This commit is contained in:
yuni 2024-03-16 16:22:44 +01:00
parent e8dbe717cd
commit 27eea41398
2 changed files with 104 additions and 2 deletions

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use bevy::prelude::*;
use bevy::{
asset::LoadState,
core_pipeline::Skybox,
prelude::*,
render::{
render_resource::{TextureViewDescriptor, TextureViewDimension},
renderer::RenderDevice,
texture::CompressedImageFormats,
},
};
fn main() {
App::new()
.add_systems(Update, handle_input)
.add_systems(Startup, setup)
.add_systems(Update, (
asset_loaded.after(load_cubemap_asset),
handle_input
))
.add_plugins((DefaultPlugins, ))
.run();
}
#[derive(Resource)]
struct Cubemap {
is_loaded: bool,
index: usize,
image_handle: Handle<Image>,
}
const CUBEMAPS: &[(&str, CompressedImageFormats)] = &[
(
"textures/stars_cubemap.png",
CompressedImageFormats::NONE,
),
];
fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
let skybox_handle = asset_server.load(CUBEMAPS[0].0);
// camera
commands.spawn((
Camera3dBundle {
transform: Transform::from_xyz(0.0, 0.0, 8.0).looking_at(Vec3::ZERO, Vec3::Y),
..default()
},
Skybox {
image: skybox_handle.clone(),
brightness: 150.0,
},
));
commands.insert_resource(Cubemap {
is_loaded: false,
index: 0,
image_handle: skybox_handle,
});
}
fn load_cubemap_asset(
mut cubemap: ResMut<Cubemap>,
asset_server: Res<AssetServer>,
render_device: Res<RenderDevice>,
) {
let supported_compressed_formats =
CompressedImageFormats::from_features(render_device.features());
let mut new_index = cubemap.index;
for _ in 0..CUBEMAPS.len() {
new_index = (new_index + 1) % CUBEMAPS.len();
if supported_compressed_formats.contains(CUBEMAPS[new_index].1) {
break;
}
info!("Skipping unsupported format: {:?}", CUBEMAPS[new_index]);
}
// Skip swapping to the same texture. Useful for when ktx2, zstd, or compressed texture support
// is missing
if new_index == cubemap.index {
return;
}
cubemap.index = new_index;
cubemap.image_handle = asset_server.load(CUBEMAPS[cubemap.index].0);
cubemap.is_loaded = false;
}
fn asset_loaded(
asset_server: Res<AssetServer>,
mut images: ResMut<Assets<Image>>,
mut cubemap: ResMut<Cubemap>,
mut skyboxes: Query<&mut Skybox>,
) {
if !cubemap.is_loaded && asset_server.load_state(&cubemap.image_handle) == LoadState::Loaded {
info!("Swapping to {}...", CUBEMAPS[cubemap.index].0);
let image = images.get_mut(&cubemap.image_handle).unwrap();
// NOTE: PNGs do not have any metadata that could indicate they contain a cubemap texture,
// so they appear as one texture. The following code reconfigures the texture as necessary.
if image.texture_descriptor.array_layer_count() == 1 {
image.reinterpret_stacked_2d_as_array(image.height() / image.width());
image.texture_view_descriptor = Some(TextureViewDescriptor {
dimension: Some(TextureViewDimension::Cube),
..default()
});
}
for mut skybox in &mut skyboxes {
skybox.image = cubemap.image_handle.clone();
}
cubemap.is_loaded = true;
}
}
fn handle_input(
keyboard_input: Res<ButtonInput<KeyCode>>,
mut app_exit_events: ResMut<Events<bevy::app::AppExit>>