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https://github.com/bevyengine/bevy
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# Objective NOTE: This depends on #7267 and should not be merged until #7267 is merged. If you are reviewing this before that is merged, I highly recommend viewing the Base Sets commit instead of trying to find my changes amongst those from #7267. "Default sets" as described by the [Stageless RFC](https://github.com/bevyengine/rfcs/pull/45) have some [unfortunate consequences](https://github.com/bevyengine/bevy/discussions/7365). ## Solution This adds "base sets" as a variant of `SystemSet`: A set is a "base set" if `SystemSet::is_base` returns `true`. Typically this will be opted-in to using the `SystemSet` derive: ```rust #[derive(SystemSet, Clone, Hash, Debug, PartialEq, Eq)] #[system_set(base)] enum MyBaseSet { A, B, } ``` **Base sets are exclusive**: a system can belong to at most one "base set". Adding a system to more than one will result in an error. When possible we fail immediately during system-config-time with a nice file + line number. For the more nested graph-ey cases, this will fail at the final schedule build. **Base sets cannot belong to other sets**: this is where the word "base" comes from Systems and Sets can only be added to base sets using `in_base_set`. Calling `in_set` with a base set will fail. As will calling `in_base_set` with a normal set. ```rust app.add_system(foo.in_base_set(MyBaseSet::A)) // X must be a normal set ... base sets cannot be added to base sets .configure_set(X.in_base_set(MyBaseSet::A)) ``` Base sets can still be configured like normal sets: ```rust app.add_system(MyBaseSet::B.after(MyBaseSet::Ap)) ``` The primary use case for base sets is enabling a "default base set": ```rust schedule.set_default_base_set(CoreSet::Update) // this will belong to CoreSet::Update by default .add_system(foo) // this will override the default base set with PostUpdate .add_system(bar.in_base_set(CoreSet::PostUpdate)) ``` This allows us to build apis that work by default in the standard Bevy style. This is a rough analog to the "default stage" model, but it use the new "stageless sets" model instead, with all of the ordering flexibility (including exclusive systems) that it provides. --- ## Changelog - Added "base sets" and ported CoreSet to use them. ## Migration Guide TODO
60 lines
1.8 KiB
Rust
60 lines
1.8 KiB
Rust
//! This example shows how to configure Multi-Sample Anti-Aliasing. Setting the sample count higher
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//! will result in smoother edges, but it will also increase the cost to render those edges. The
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//! range should generally be somewhere between 1 (no multi sampling, but cheap) to 8 (crisp but
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//! expensive).
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//! Note that WGPU currently only supports 1 or 4 samples.
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//! Ultimately we plan on supporting whatever is natively supported on a given device.
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//! Check out [this issue](https://github.com/gfx-rs/wgpu/issues/1832) for more info.
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use bevy::prelude::*;
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fn main() {
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App::new()
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.insert_resource(Msaa::default())
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.add_plugins(DefaultPlugins)
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.add_startup_system(setup)
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.add_system(cycle_msaa)
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.run();
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}
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/// set up a simple 3D scene
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fn setup(
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mut commands: Commands,
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mut meshes: ResMut<Assets<Mesh>>,
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mut materials: ResMut<Assets<StandardMaterial>>,
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) {
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info!("Press 'm' to toggle MSAA");
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info!("Using 4x MSAA");
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// cube
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commands.spawn(PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Cube { size: 2.0 })),
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material: materials.add(Color::rgb(0.8, 0.7, 0.6).into()),
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..default()
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});
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// light
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commands.spawn(PointLightBundle {
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transform: Transform::from_xyz(4.0, 8.0, 4.0),
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..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(-3.0, 3.0, 5.0).looking_at(Vec3::ZERO, Vec3::Y),
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..default()
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});
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}
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fn cycle_msaa(input: Res<Input<KeyCode>>, mut msaa: ResMut<Msaa>) {
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if input.just_pressed(KeyCode::M) {
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match *msaa {
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Msaa::Sample4 => {
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info!("Not using MSAA");
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*msaa = Msaa::Off;
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}
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Msaa::Off => {
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info!("Using 4x MSAA");
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*msaa = Msaa::Sample4;
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}
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}
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}
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}
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