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bevy/crates/bevy_pbr/src/lib.rs
Carter Anderson dc3f801239 Exclusive Systems Now Implement System. Flexible Exclusive System Params (#6083) 
# Objective

The [Stageless RFC](https://github.com/bevyengine/rfcs/pull/45) involves allowing exclusive systems to be referenced and ordered relative to parallel systems. We've agreed that unifying systems under `System` is the right move.

This is an alternative to #4166 (see rationale in the comments I left there). Note that this builds on the learnings established there (and borrows some patterns).

## Solution

This unifies parallel and exclusive systems under the shared `System` trait, removing the old `ExclusiveSystem` trait / impls. This is accomplished by adding a new `ExclusiveFunctionSystem` impl similar to `FunctionSystem`. It is backed by `ExclusiveSystemParam`, which is similar to `SystemParam`. There is a new flattened out SystemContainer api (which cuts out a lot of trait and type complexity). 

This means you can remove all cases of `exclusive_system()`:

```rust
// before
commands.add_system(some_system.exclusive_system());
// after
commands.add_system(some_system);
```

I've also implemented `ExclusiveSystemParam` for `&mut QueryState` and `&mut SystemState`, which makes this possible in exclusive systems:

```rust
fn some_exclusive_system(
    world: &mut World,
    transforms: &mut QueryState<&Transform>,
    state: &mut SystemState<(Res<Time>, Query<&Player>)>,
) {
    for transform in transforms.iter(world) {
        println!("{transform:?}");
    }
    let (time, players) = state.get(world);
    for player in players.iter() {
        println!("{player:?}");
    }
}
```

Note that "exclusive function systems" assume `&mut World` is present (and the first param). I think this is a fair assumption, given that the presence of `&mut World` is what defines the need for an exclusive system.

I added some targeted SystemParam `static` constraints, which removed the need for this:
``` rust
fn some_exclusive_system(state: &mut SystemState<(Res<'static, Time>, Query<&'static Player>)>) {}
```

## Related

- #2923
- #3001
- #3946

## Changelog

- `ExclusiveSystem` trait (and implementations) has been removed in favor of sharing the `System` trait.
- `ExclusiveFunctionSystem` and `ExclusiveSystemParam` were added, enabling flexible exclusive function systems
- `&mut SystemState` and `&mut QueryState` now implement `ExclusiveSystemParam`
- Exclusive and parallel System configuration is now done via a unified `SystemDescriptor`, `IntoSystemDescriptor`, and `SystemContainer` api.

## Migration Guide

Calling `.exclusive_system()` is no longer required (or supported) for converting exclusive system functions to exclusive systems:

```rust
// Old (0.8)
app.add_system(some_exclusive_system.exclusive_system());
// New (0.9)
app.add_system(some_exclusive_system);
```

Converting "normal" parallel systems to exclusive systems is done by calling the exclusive ordering apis:

```rust
// Old (0.8)
app.add_system(some_system.exclusive_system().at_end());
// New (0.9)
app.add_system(some_system.at_end());
```

Query state in exclusive systems can now be cached via ExclusiveSystemParams, which should be preferred for clarity and performance reasons:
```rust
// Old (0.8)
fn some_system(world: &mut World) {
  let mut transforms = world.query::<&Transform>();
  for transform in transforms.iter(world) {
  }
}
// New (0.9)
fn some_system(world: &mut World, transforms: &mut QueryState<&Transform>) {
  for transform in transforms.iter(world) {
  }
}
```
2022-09-26 23:57:07 +00:00

266 lines
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Rust
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pub mod wireframe;
mod alpha;
mod bundle;
mod light;
mod material;
mod pbr_material;
mod render;
pub use alpha::*;
pub use bundle::*;
pub use light::*;
pub use material::*;
pub use pbr_material::*;
pub use render::*;
use bevy_window::ModifiesWindows;
pub mod prelude {
#[doc(hidden)]
pub use crate::{
alpha::AlphaMode,
bundle::{
DirectionalLightBundle, MaterialMeshBundle, PbrBundle, PointLightBundle,
SpotLightBundle,
},
light::{AmbientLight, DirectionalLight, PointLight, SpotLight},
material::{Material, MaterialPlugin},
pbr_material::StandardMaterial,
};
}
pub mod draw_3d_graph {
pub mod node {
/// Label for the shadow pass node.
pub const SHADOW_PASS: &str = "shadow_pass";
}
}
use bevy_app::prelude::*;
use bevy_asset::{load_internal_asset, Assets, Handle, HandleUntyped};
use bevy_ecs::prelude::*;
use bevy_reflect::TypeUuid;
use bevy_render::{
camera::CameraUpdateSystem,
extract_resource::ExtractResourcePlugin,
prelude::Color,
render_graph::RenderGraph,
render_phase::{sort_phase_system, AddRenderCommand, DrawFunctions},
render_resource::{Shader, SpecializedMeshPipelines},
view::VisibilitySystems,
RenderApp, RenderStage,
};
use bevy_transform::TransformSystem;
pub const PBR_TYPES_SHADER_HANDLE: HandleUntyped =
HandleUntyped::weak_from_u64(Shader::TYPE_UUID, 1708015359337029744);
pub const PBR_BINDINGS_SHADER_HANDLE: HandleUntyped =
HandleUntyped::weak_from_u64(Shader::TYPE_UUID, 5635987986427308186);
pub const UTILS_HANDLE: HandleUntyped =
HandleUntyped::weak_from_u64(Shader::TYPE_UUID, 1900548483293416725);
pub const CLUSTERED_FORWARD_HANDLE: HandleUntyped =
HandleUntyped::weak_from_u64(Shader::TYPE_UUID, 166852093121196815);
pub const PBR_LIGHTING_HANDLE: HandleUntyped =
HandleUntyped::weak_from_u64(Shader::TYPE_UUID, 14170772752254856967);
pub const SHADOWS_HANDLE: HandleUntyped =
HandleUntyped::weak_from_u64(Shader::TYPE_UUID, 11350275143789590502);
pub const PBR_SHADER_HANDLE: HandleUntyped =
HandleUntyped::weak_from_u64(Shader::TYPE_UUID, 4805239651767701046);
pub const PBR_FUNCTIONS_HANDLE: HandleUntyped =
HandleUntyped::weak_from_u64(Shader::TYPE_UUID, 16550102964439850292);
pub const SHADOW_SHADER_HANDLE: HandleUntyped =
HandleUntyped::weak_from_u64(Shader::TYPE_UUID, 1836745567947005696);
/// Sets up the entire PBR infrastructure of bevy.
#[derive(Default)]
pub struct PbrPlugin;
impl Plugin for PbrPlugin {
fn build(&self, app: &mut App) {
load_internal_asset!(
app,
PBR_TYPES_SHADER_HANDLE,
"render/pbr_types.wgsl",
Shader::from_wgsl
);
load_internal_asset!(
app,
PBR_BINDINGS_SHADER_HANDLE,
"render/pbr_bindings.wgsl",
Shader::from_wgsl
);
load_internal_asset!(app, UTILS_HANDLE, "render/utils.wgsl", Shader::from_wgsl);
load_internal_asset!(
app,
CLUSTERED_FORWARD_HANDLE,
"render/clustered_forward.wgsl",
Shader::from_wgsl
);
load_internal_asset!(
app,
PBR_LIGHTING_HANDLE,
"render/pbr_lighting.wgsl",
Shader::from_wgsl
);
load_internal_asset!(
app,
SHADOWS_HANDLE,
"render/shadows.wgsl",
Shader::from_wgsl
);
load_internal_asset!(
app,
PBR_FUNCTIONS_HANDLE,
"render/pbr_functions.wgsl",
Shader::from_wgsl
);
load_internal_asset!(app, PBR_SHADER_HANDLE, "render/pbr.wgsl", Shader::from_wgsl);
load_internal_asset!(
app,
SHADOW_SHADER_HANDLE,
"render/depth.wgsl",
Shader::from_wgsl
);
app.register_type::<CubemapVisibleEntities>()
.register_type::<DirectionalLight>()
.register_type::<PointLight>()
.register_type::<SpotLight>()
.add_plugin(MeshRenderPlugin)
.add_plugin(MaterialPlugin::<StandardMaterial>::default())
.register_type::<AmbientLight>()
.register_type::<DirectionalLightShadowMap>()
.register_type::<PointLightShadowMap>()
.init_resource::<AmbientLight>()
.init_resource::<GlobalVisiblePointLights>()
.init_resource::<DirectionalLightShadowMap>()
.init_resource::<PointLightShadowMap>()
.add_plugin(ExtractResourcePlugin::<AmbientLight>::default())
.add_system_to_stage(
CoreStage::PostUpdate,
// NOTE: Clusters need to have been added before update_clusters is run so
// add as an exclusive system
add_clusters
.at_start()
.label(SimulationLightSystems::AddClusters),
)
.add_system_to_stage(
CoreStage::PostUpdate,
assign_lights_to_clusters
.label(SimulationLightSystems::AssignLightsToClusters)
.after(TransformSystem::TransformPropagate)
.after(VisibilitySystems::CheckVisibility)
.after(CameraUpdateSystem)
.after(ModifiesWindows),
)
.add_system_to_stage(
CoreStage::PostUpdate,
update_directional_light_frusta
.label(SimulationLightSystems::UpdateLightFrusta)
// This must run after CheckVisibility because it relies on ComputedVisibility::is_visible()
.after(VisibilitySystems::CheckVisibility)
.after(TransformSystem::TransformPropagate),
)
.add_system_to_stage(
CoreStage::PostUpdate,
update_point_light_frusta
.label(SimulationLightSystems::UpdateLightFrusta)
.after(TransformSystem::TransformPropagate)
.after(SimulationLightSystems::AssignLightsToClusters),
)
.add_system_to_stage(
CoreStage::PostUpdate,
update_spot_light_frusta
.label(SimulationLightSystems::UpdateLightFrusta)
.after(TransformSystem::TransformPropagate)
.after(SimulationLightSystems::AssignLightsToClusters),
)
.add_system_to_stage(
CoreStage::PostUpdate,
check_light_mesh_visibility
.label(SimulationLightSystems::CheckLightVisibility)
.after(TransformSystem::TransformPropagate)
.after(VisibilitySystems::CalculateBounds)
.after(SimulationLightSystems::UpdateLightFrusta)
// NOTE: This MUST be scheduled AFTER the core renderer visibility check
// because that resets entity ComputedVisibility for the first view
// which would override any results from this otherwise
.after(VisibilitySystems::CheckVisibility),
);
app.world
.resource_mut::<Assets<StandardMaterial>>()
.set_untracked(
Handle::<StandardMaterial>::default(),
StandardMaterial {
base_color: Color::rgb(1.0, 0.0, 0.5),
unlit: true,
..Default::default()
},
);
let render_app = match app.get_sub_app_mut(RenderApp) {
Ok(render_app) => render_app,
Err(_) => return,
};
render_app
.add_system_to_stage(
RenderStage::Extract,
render::extract_clusters.label(RenderLightSystems::ExtractClusters),
)
.add_system_to_stage(
RenderStage::Extract,
render::extract_lights.label(RenderLightSystems::ExtractLights),
)
.add_system_to_stage(
RenderStage::Prepare,
// this is added as an exclusive system because it contributes new views. it must run (and have Commands applied)
// _before_ the `prepare_views()` system is run. ideally this becomes a normal system when "stageless" features come out
render::prepare_lights
.at_start()
.label(RenderLightSystems::PrepareLights),
)
.add_system_to_stage(
RenderStage::Prepare,
// NOTE: This needs to run after prepare_lights. As prepare_lights is an exclusive system,
// just adding it to the non-exclusive systems in the Prepare stage means it runs after
// prepare_lights.
render::prepare_clusters.label(RenderLightSystems::PrepareClusters),
)
.add_system_to_stage(
RenderStage::Queue,
render::queue_shadows.label(RenderLightSystems::QueueShadows),
)
.add_system_to_stage(RenderStage::Queue, render::queue_shadow_view_bind_group)
.add_system_to_stage(RenderStage::PhaseSort, sort_phase_system::<Shadow>)
.init_resource::<ShadowPipeline>()
.init_resource::<DrawFunctions<Shadow>>()
.init_resource::<LightMeta>()
.init_resource::<GlobalLightMeta>()
.init_resource::<SpecializedMeshPipelines<ShadowPipeline>>();
let shadow_pass_node = ShadowPassNode::new(&mut render_app.world);
render_app.add_render_command::<Shadow, DrawShadowMesh>();
let mut graph = render_app.world.resource_mut::<RenderGraph>();
let draw_3d_graph = graph
.get_sub_graph_mut(bevy_core_pipeline::core_3d::graph::NAME)
.unwrap();
draw_3d_graph.add_node(draw_3d_graph::node::SHADOW_PASS, shadow_pass_node);
draw_3d_graph
.add_node_edge(
draw_3d_graph::node::SHADOW_PASS,
bevy_core_pipeline::core_3d::graph::node::MAIN_PASS,
)
.unwrap();
draw_3d_graph
.add_slot_edge(
draw_3d_graph.input_node().unwrap().id,
bevy_core_pipeline::core_3d::graph::input::VIEW_ENTITY,
draw_3d_graph::node::SHADOW_PASS,
ShadowPassNode::IN_VIEW,
)
.unwrap();
}
}
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