# Objective
Documentation should no longer be using pre-stageless terminology to
avoid confusion.
## Solution
- update all docs referring to stages to instead refer to sets/schedules
where appropriate
- also mention `apply_system_buffers` for anything system-buffer-related
that previously referred to buffers being applied "at the end of a
stage"
# Objective
`Or<T>` should be a new type of `PhantomData<T>` instead of `T`.
## Solution
Make `Or<T>` a new type of `PhantomData<T>`.
## Migration Guide
`Or<T>` is just used as a type annotation and shouldn't be constructed.
# Objective
When using the `#[derive(WorldQuery)]` macro, the `ReadOnly` struct
generated has default (private) visibility for each field, regardless of
the visibility of the original field.
## Solution
For each field of a read-only `WorldQuery` variant, use the visibility
of the associated field defined on the original struct.
# Objective
Fix#1727Fix#8010
Meta types generated by the `SystemParam` and `WorldQuery` derive macros
can conflict with user-defined types if they happen to have the same
name.
## Solution
In order to check if an identifier would conflict with user-defined
types, we can just search the original `TokenStream` passed to the macro
to see if it contains the identifier (since the meta types are defined
in an anonymous scope, it's only possible for them to conflict with the
struct definition itself). When generating an identifier for meta types,
we can simply check if it would conflict, and then add additional
characters to the name until it no longer conflicts with anything.
The `WorldQuery` "Item" and read-only structs are a part of a module's
public API, and thus it is intended for them to conflict with
user-defined types.
# Objective
The function `assert_is_system` is used in documentation tests to ensure
that example code actually produces valid systems. Currently,
`assert_is_system` just checks that each function parameter implements
`SystemParam`. To further check the validity of the system, we should
initialize the passed system so that it will be checked for conflicting
accesses. Not only does this enforce the validity of our examples, but
it provides a convenient way to demonstrate conflicting accesses via a
`should_panic` example, which is nicely rendered by rustdoc:
## Solution
Initialize the system with an empty world to trigger its internal access
conflict checks.
---
## Changelog
The function `bevy::ecs::system::assert_is_system` now panics when
passed a system with conflicting world accesses, as does
`assert_is_read_only_system`.
## Migration Guide
The functions `assert_is_system` and `assert_is_read_only_system` (in
`bevy_ecs::system`) now panic if the passed system has invalid world
accesses. Any tests that called this function on a system with invalid
accesses will now fail. Either fix the system's conflicting accesses, or
specify that the test is meant to fail:
1. For regular tests (that is, functions annotated with `#[test]`), add
the `#[should_panic]` attribute to the function.
2. For documentation tests, add `should_panic` to the start of the code
block: ` ```should_panic`
# Objective
We're currently using an unconditional `unwrap` in multiple locations
when inserting bundles into an entity when we know it will never fail.
This adds a large amount of extra branching that could be avoided on in
release builds.
## Solution
Use `DebugCheckedUnwrap` in bundle insertion code where relevant. Add
and update the safety comments to match.
This should remove the panicking branches from release builds, which has
a significant impact on the generated code:
https://github.com/james7132/bevy_asm_tests/compare/less-panicking-bundles#diff-e55a27cfb1615846ed3b6472f15a1aed66ed394d3d0739b3117f95cf90f46951R2086
shows about a 10% reduction in the number of generated instructions for
`EntityMut::insert`, `EntityMut::remove`, `EntityMut::take`, and related
functions.
---------
Co-authored-by: JoJoJet <21144246+JoJoJet@users.noreply.github.com>
Co-authored-by: Carter Anderson <mcanders1@gmail.com>
This MR is a rebased and alternative proposal to
https://github.com/bevyengine/bevy/pull/5602
# Objective
- https://github.com/bevyengine/bevy/pull/4447 implemented untyped
(using component ids instead of generics and TypeId) APIs for
inserting/accessing resources and accessing components, but left
inserting components for another PR (this one)
## Solution
- add `EntityMut::insert_by_id`
- split `Bundle` into `DynamicBundle` with `get_components` and `Bundle:
DynamicBundle`. This allows the `BundleInserter` machinery to be reused
for bundles that can only be written, not read, and have no statically
available `ComponentIds`
- Compared to the original MR this approach exposes unsafe endpoints and
requires the user to manage instantiated `BundleIds`. This is quite easy
for the end user to do and does not incur the performance penalty of
checking whether component input is correctly provided for the
`BundleId`.
- This MR does ensure that constructing `BundleId` itself is safe
---
## Changelog
- add methods for inserting bundles and components to:
`world.entity_mut(entity).insert_by_id`
# Objective
#7863 introduced a potential footgun. When trying to incorrectly add a user-defined type using `in_base_set`, the compiler will suggest that the user implement `BaseSystemSet` for their type. This is a reasonable-sounding suggestion, however this is not the correct way to make a base set, and will lead to a confusing panic message when a marker trait is implemented for the wrong type.
## Solution
Rewrite the documentation for these traits, making it more clear that `BaseSystemSet` is a marker for types that are already base sets, and not a way to define a base set.
# Objective
The trait `IntoSystemConfig<>` requires each implementer to repeat every single member method, even though they can all be implemented by just deferring to `SystemConfig`.
## Solution
Add default implementations to most member methods.
# Objective
Base sets, added in #7466 are a special type of system set. Systems can only be added to base sets via `in_base_set`, while non-base sets can only be added via `in_set`. Unfortunately this is currently guarded by a runtime panic, which presents an unfortunate toe-stub when the wrong method is used. The delayed response between writing code and encountering the error (possibly hours) makes the distinction between base sets and other sets much more difficult to learn.
## Solution
Add the marker traits `BaseSystemSet` and `FreeSystemSet`. `in_base_set` and `in_set` now respectively accept these traits, which moves the runtime panic to a compile time error.
---
## Changelog
+ Added the marker trait `BaseSystemSet`, which is distinguished from a `FreeSystemSet`. These are both subtraits of `SystemSet`.
## Migration Guide
None if merged with 0.10
…or's ticker for one thread.
# Objective
- Fix debug_asset_server hang.
## Solution
- Reuse the thread_local executor for MainThreadExecutor resource, so there will be only one ThreadExecutor for main thread.
- If ThreadTickers from same executor, they are conflict with each other. Then only tick one.
# Objective
The `ScheduleBuildError` type has a `Display` implementation which beautifully formats the error. However, schedule build errors are currently reported using `unwrap()`, which uses the `Debug` implementation and makes the error message look unfished.
## Solution
Use `unwrap_or_else` so we can customize the formatting of the error message.
# Objective
Several `Query` methods unnecessarily place the call to `Query::update_archetypes` inside of unsafe blocks.
## Solution
Move the method calls out of the unsafe blocks.
# Objective
There is a panic that occurs when creating a run condition that accesses `NonSend` resources, but it refers to them as 'thread-local' resources instead.
## Solution
Correct the terminology.
# Objective
This is a follow-up to #7745. An unbounded `async_channel` occasionally allocates whenever it exceeds the capacity of the current buffer in it's internal linked list. This is avoidable.
This also used to be a bounded channel before stageless, which was introduced in #4919.
## Solution
Use a bounded channel to avoid allocations on system completion.
This shouldn't conflict with #7745, as it's impossible for the scheduler to exceed the channel capacity, even if somehow every system completed at the same time.
`EntityMut::move_entity_from_remove` had two soundness bugs:
- When removing the entity from the archetype, the swapped entity had its table row updated to the same as the removed entity's
- When removing the entity from the table, the swapped entity did not have its table row updated
`BundleInsert::insert` had two/three soundness bugs
- When moving an entity to a new archetype from an `insert`, the swapped entity had its table row set to a different entities
- When moving an entity to a new table from an `insert`, the swapped entity did not have its table row updated
See added tests for examples that trigger those bugs
`EntityMut::despawn` had two soundness bugs
- When despawning an entity, the swapped entity had its table row set to a different entities even if the table didnt change
- When despawning an entity, the swapped entity did not have its table row updated
# Objective
- A more intuitive distinction between the two. `remove_intersection` is verbose and unclear.
- `EntityMut::remove` and `Commands::remove` should match.
## Solution
- What the title says.
---
## Migration Guide
Before
```rust
fn clear_children(parent: Entity, world: &mut World) {
if let Some(children) = world.entity_mut(parent).remove::<Children>() {
for &child in &children.0 {
world.entity_mut(child).remove_intersection::<Parent>();
}
}
}
```
After
```rust
fn clear_children(parent: Entity, world: &mut World) {
if let Some(children) = world.entity_mut(parent).take::<Children>() {
for &child in &children.0 {
world.entity_mut(child).remove::<Parent>();
}
}
}
```
# Objective
Support the following syntax for adding systems:
```rust
App::new()
.add_system(setup.on_startup())
.add_systems((
show_menu.in_schedule(OnEnter(GameState::Paused)),
menu_ssytem.in_set(OnUpdate(GameState::Paused)),
hide_menu.in_schedule(OnExit(GameState::Paused)),
))
```
## Solution
Add the traits `IntoSystemAppConfig{s}`, which provide the extension methods necessary for configuring which schedule a system belongs to. These extension methods return `IntoSystemAppConfig{s}`, which `App::add_system{s}` uses to choose which schedule to add systems to.
---
## Changelog
+ Added the extension methods `in_schedule(label)` and `on_startup()` for configuring the schedule a system belongs to.
## Future Work
* Replace all uses of `add_startup_system` in the engine.
* Deprecate this method
# Objective
While we use `#[doc(hidden)]` to try and hide marker generics from the user, these types reveal themselves in compiler errors, adding visual noise and confusion.
## Solution
Replace the `AlreadyWasSystem` marker generic with `()`, to reduce visual noise in error messages. This also makes it possible to return `impl Condition<()>` from combinators.
For function systems, use their function signature as the marker type. This should drastically improve the legibility of some error messages.
The `InputMarker` type has been removed, since it is unnecessary.
# Objective
Several places in the ECS use marker generics to avoid overlapping trait implementations, but different places alternately refer to it as `Params` and `Marker`. This is potentially confusing, since it might not be clear that the same pattern is being used. Additionally, users might be misled into thinking that the `Params` type corresponds to the `SystemParam`s of a system.
## Solution
Rename `Params` to `Marker`.
# Objective
Fixes#3980
## Solution
Added examples to show how to run a `Schedule`, one with a unique system, and another with several systems
---
## Changelog
- Added: examples in docs to show how to run a `Schedule`
Co-authored-by: remiCzn <77072160+remiCzn@users.noreply.github.com>
# Objective
The `BoxedCondition` type alias does not require the underlying system to be read-only.
## Solution
Define the type alias using `ReadOnlySystem` instead of `System`.
Graph theory make head hurty. Closes#7367.
Basically, when we topologically sort the dependency graph, we already find its strongly-connected components (a really [neat algorithm][1]). This PR adds an algorithm that can dissect those into simple cycles, giving us more useful error reports.
test: `system_build_errors::dependency_cycle`
```
schedule has 1 before/after cycle(s):
cycle 1: system set 'A' must run before itself
system set 'A'
... which must run before system set 'B'
... which must run before system set 'A'
```
```
schedule has 1 before/after cycle(s):
cycle 1: system 'foo' must run before itself
system 'foo'
... which must run before system 'bar'
... which must run before system 'foo'
```
test: `system_build_errors::hierarchy_cycle`
```
schedule has 1 in_set cycle(s):
cycle 1: system set 'A' contains itself
system set 'A'
... which contains system set 'B'
... which contains system set 'A'
```
[1]: https://en.wikipedia.org/wiki/Tarjan%27s_strongly_connected_components_algorithm
Add some more useful common run conditions.
Some of these existed in `iyes_loopless`. I know people used them, and it would be a regression for those users, when they try to migrate to new Bevy stageless, if they are missing.
I also took the opportunity to add a few more new ones.
---
## Changelog
### Added
- More "common run conditions": on_event, resource change detection, state_changed, any_with_component
# Objective
Fix#5026.
## Solution
Only make a `trace!` log if the event count changed.
---
## Changelog
Changed: `EventWriter::send_batch` will only log a TRACE level log if the batch is non-empty.
# Objective
Fix#7584.
## Solution
Add an abstraction for creating custom system combinators with minimal boilerplate. Use this to implement AND/OR combinators. Use this to simplify the implementation of `PipeSystem`.
## Example
Feel free to bikeshed on the syntax.
I chose the names `and_then`/`or_else` to emphasize the fact that these short-circuit, while I chose method syntax to empasize that the arguments are *not* treated equally.
```rust
app.add_systems((
my_system.run_if(resource_exists::<R>().and_then(resource_equals(R(0)))),
our_system.run_if(resource_exists::<R>().or_else(resource_exists::<S>())),
));
```
---
## Todo
- [ ] Decide on a syntax
- [x] Write docs
- [x] Write tests
## Changelog
+ Added the extension methods `.and_then(...)` and `.or_else(...)` to run conditions, which allows combining run conditions with short-circuiting behavior.
+ Added the trait `Combine`, which can be used with the new `CombinatorSystem` to create system combinators with custom behavior.
# Objective
- Fixes#7442.
## Solution
- Added `report_sets` option to `ScheduleBuildSettings` like described in the linked issue.
The output of the `3d_scene` example when reporting ambiguities with `report_sets` and `use_shortnames` set to `true` (and with #7755 applied) now looks like this:
```
82 pairs of systems with conflicting data access have indeterminate execution order. Consider adding `before`, `after`, or `ambiguous_with` relationships between these:
-- filesystem_watcher_system (LoadAssets) and apply_system_buffers (FirstFlush)
conflict on: bevy_ecs::world::World
-- update_asset_storage_system<DynamicScene> (LoadAssets) and apply_system_buffers (FirstFlush)
conflict on: bevy_ecs::world::World
-- update_asset_storage_system<Scene> (LoadAssets) and apply_system_buffers (FirstFlush)
conflict on: bevy_ecs::world::World
-- update_asset_storage_system<Shader> (LoadAssets) and apply_system_buffers (FirstFlush)
conflict on: bevy_ecs::world::World
-- update_asset_storage_system<Mesh> (LoadAssets) and apply_system_buffers (FirstFlush)
conflict on: bevy_ecs::world::World
-- update_asset_storage_system<SkinnedMeshInverseBindposes> (LoadAssets) and apply_system_buffers (FirstFlush)
conflict on: bevy_ecs::world::World
-- update_asset_storage_system<Image> (LoadAssets) and apply_system_buffers (FirstFlush)
conflict on: bevy_ecs::world::World
-- update_asset_storage_system<TextureAtlas> (LoadAssets) and apply_system_buffers (FirstFlush)
conflict on: bevy_ecs::world::World
-- update_asset_storage_system<ColorMaterial> (LoadAssets) and apply_system_buffers (FirstFlush)
conflict on: bevy_ecs::world::World
-- update_asset_storage_system<Font> (LoadAssets) and apply_system_buffers (FirstFlush)
conflict on: bevy_ecs::world::World
-- update_asset_storage_system<FontAtlasSet> (LoadAssets) and apply_system_buffers (FirstFlush)
conflict on: bevy_ecs::world::World
-- update_asset_storage_system<StandardMaterial> (LoadAssets) and apply_system_buffers (FirstFlush)
conflict on: bevy_ecs::world::World
-- update_asset_storage_system<Gltf> (LoadAssets) and apply_system_buffers (FirstFlush)
conflict on: bevy_ecs::world::World
-- update_asset_storage_system<GltfNode> (LoadAssets) and apply_system_buffers (FirstFlush)
conflict on: bevy_ecs::world::World
-- update_asset_storage_system<GltfPrimitive> (LoadAssets) and apply_system_buffers (FirstFlush)
conflict on: bevy_ecs::world::World
-- update_asset_storage_system<GltfMesh> (LoadAssets) and apply_system_buffers (FirstFlush)
conflict on: bevy_ecs::world::World
-- update_asset_storage_system<AudioSource> (LoadAssets) and apply_system_buffers (FirstFlush)
conflict on: bevy_ecs::world::World
-- update_asset_storage_system<AudioSink> (LoadAssets) and apply_system_buffers (FirstFlush)
conflict on: bevy_ecs::world::World
-- update_asset_storage_system<AnimationClip> (LoadAssets) and apply_system_buffers (FirstFlush)
conflict on: bevy_ecs::world::World
-- scene_spawner_system (Update) and close_when_requested (Update)
conflict on: bevy_ecs::world::World
-- exit_on_all_closed (PostUpdate) and apply_system_buffers (CalculateBoundsFlush, PostUpdate)
conflict on: bevy_ecs::world::World
-- exit_on_all_closed (PostUpdate) and apply_system_buffers (AddClustersFlush, PostUpdate)
conflict on: bevy_ecs::world::World
-- camera_system<Projection> (CameraUpdateSystem, PostUpdate) and apply_system_buffers (CalculateBoundsFlush, PostUpdate)
conflict on: bevy_ecs::world::World
-- camera_system<Projection> (CameraUpdateSystem, PostUpdate) and apply_system_buffers (AddClustersFlush, PostUpdate)
conflict on: bevy_ecs::world::World
-- camera_system<OrthographicProjection> (CameraUpdateSystem, PostUpdate) and apply_system_buffers (CalculateBoundsFlush, PostUpdate)
conflict on: bevy_ecs::world::World
-- camera_system<OrthographicProjection> (CameraUpdateSystem, PostUpdate) and apply_system_buffers (AddClustersFlush, PostUpdate)
conflict on: bevy_ecs::world::World
-- camera_system<PerspectiveProjection> (CameraUpdateSystem, PostUpdate) and apply_system_buffers (CalculateBoundsFlush, PostUpdate)
conflict on: bevy_ecs::world::World
-- camera_system<PerspectiveProjection> (CameraUpdateSystem, PostUpdate) and apply_system_buffers (AddClustersFlush, PostUpdate)
conflict on: bevy_ecs::world::World
-- calculate_bounds (CalculateBounds, PostUpdate) and apply_system_buffers (AddClustersFlush, PostUpdate)
conflict on: bevy_ecs::world::World
-- apply_system_buffers (CalculateBoundsFlush, PostUpdate) and visibility_propagate_system (PostUpdate, VisibilityPropagate)
conflict on: bevy_ecs::world::World
-- apply_system_buffers (CalculateBoundsFlush, PostUpdate) and update_text2d_layout (PostUpdate)
conflict on: bevy_ecs::world::World
-- apply_system_buffers (CalculateBoundsFlush, PostUpdate) and ui_stack_system (PostUpdate, Stack)
conflict on: bevy_ecs::world::World
-- apply_system_buffers (CalculateBoundsFlush, PostUpdate) and text_system (PostUpdate)
conflict on: bevy_ecs::world::World
-- apply_system_buffers (CalculateBoundsFlush, PostUpdate) and update_image_calculated_size_system (PostUpdate)
conflict on: bevy_ecs::world::World
-- apply_system_buffers (CalculateBoundsFlush, PostUpdate) and flex_node_system (Flex, PostUpdate)
conflict on: bevy_ecs::world::World
-- apply_system_buffers (CalculateBoundsFlush, PostUpdate) and add_clusters (AddClusters, PostUpdate)
conflict on: bevy_ecs::world::World
-- apply_system_buffers (CalculateBoundsFlush, PostUpdate) and apply_system_buffers (AddClustersFlush, PostUpdate)
conflict on: bevy_ecs::world::World
-- apply_system_buffers (CalculateBoundsFlush, PostUpdate) and play_queued_audio_system<AudioSource> (PostUpdate)
conflict on: bevy_ecs::world::World
-- apply_system_buffers (CalculateBoundsFlush, PostUpdate) and animation_player (PostUpdate)
conflict on: bevy_ecs::world::World
-- apply_system_buffers (CalculateBoundsFlush, PostUpdate) and propagate_transforms (PostUpdate, TransformPropagate)
conflict on: bevy_ecs::world::World
-- apply_system_buffers (CalculateBoundsFlush, PostUpdate) and sync_simple_transforms (PostUpdate, TransformPropagate)
conflict on: bevy_ecs::world::World
-- apply_system_buffers (CalculateBoundsFlush, PostUpdate) and update_directional_light_cascades (PostUpdate, UpdateDirectionalLightCascades)
conflict on: bevy_ecs::world::World
-- apply_system_buffers (CalculateBoundsFlush, PostUpdate) and update_clipping_system (PostUpdate)
conflict on: bevy_ecs::world::World
-- apply_system_buffers (CalculateBoundsFlush, PostUpdate) and update_frusta<Projection> (PostUpdate, UpdateProjectionFrusta)
conflict on: bevy_ecs::world::World
-- apply_system_buffers (CalculateBoundsFlush, PostUpdate) and update_frusta<PerspectiveProjection> (PostUpdate, UpdatePerspectiveFrusta)
conflict on: bevy_ecs::world::World
-- apply_system_buffers (CalculateBoundsFlush, PostUpdate) and update_frusta<OrthographicProjection> (PostUpdate, UpdateOrthographicFrusta)
conflict on: bevy_ecs::world::World
-- visibility_propagate_system (PostUpdate, VisibilityPropagate) and apply_system_buffers (AddClustersFlush, PostUpdate)
conflict on: bevy_ecs::world::World
-- update_text2d_layout (PostUpdate) and apply_system_buffers (AddClustersFlush, PostUpdate)
conflict on: bevy_ecs::world::World
-- ui_stack_system (PostUpdate, Stack) and apply_system_buffers (AddClustersFlush, PostUpdate)
conflict on: bevy_ecs::world::World
-- text_system (PostUpdate) and apply_system_buffers (AddClustersFlush, PostUpdate)
conflict on: bevy_ecs::world::World
-- update_image_calculated_size_system (PostUpdate) and apply_system_buffers (AddClustersFlush, PostUpdate)
conflict on: bevy_ecs::world::World
-- flex_node_system (Flex, PostUpdate) and apply_system_buffers (AddClustersFlush, PostUpdate)
conflict on: bevy_ecs::world::World
-- flex_node_system (Flex, PostUpdate) and animation_player (PostUpdate)
conflict on: ["bevy_transform::components::transform::Transform"]
-- apply_system_buffers (AddClustersFlush, PostUpdate) and play_queued_audio_system<AudioSource> (PostUpdate)
conflict on: bevy_ecs::world::World
-- apply_system_buffers (AddClustersFlush, PostUpdate) and animation_player (PostUpdate)
conflict on: bevy_ecs::world::World
-- apply_system_buffers (AddClustersFlush, PostUpdate) and propagate_transforms (PostUpdate, TransformPropagate)
conflict on: bevy_ecs::world::World
-- apply_system_buffers (AddClustersFlush, PostUpdate) and sync_simple_transforms (PostUpdate, TransformPropagate)
conflict on: bevy_ecs::world::World
-- apply_system_buffers (AddClustersFlush, PostUpdate) and update_directional_light_cascades (PostUpdate, UpdateDirectionalLightCascades)
conflict on: bevy_ecs::world::World
-- apply_system_buffers (AddClustersFlush, PostUpdate) and update_clipping_system (PostUpdate)
conflict on: bevy_ecs::world::World
-- apply_system_buffers (AddClustersFlush, PostUpdate) and update_frusta<Projection> (PostUpdate, UpdateProjectionFrusta)
conflict on: bevy_ecs::world::World
-- apply_system_buffers (AddClustersFlush, PostUpdate) and update_frusta<PerspectiveProjection> (PostUpdate, UpdatePerspectiveFrusta)
conflict on: bevy_ecs::world::World
-- apply_system_buffers (AddClustersFlush, PostUpdate) and update_frusta<OrthographicProjection> (PostUpdate, UpdateOrthographicFrusta)
conflict on: bevy_ecs::world::World
-- apply_system_buffers (AddClustersFlush, PostUpdate) and check_visibility (CheckVisibility, PostUpdate)
conflict on: bevy_ecs::world::World
-- apply_system_buffers (AddClustersFlush, PostUpdate) and update_directional_light_frusta (PostUpdate, UpdateLightFrusta)
conflict on: bevy_ecs::world::World
-- Assets<Scene>::asset_event_system (AssetEvents) and apply_system_buffers (PostUpdateFlush)
conflict on: bevy_ecs::world::World
-- Assets<Shader>::asset_event_system (AssetEvents) and apply_system_buffers (PostUpdateFlush)
conflict on: bevy_ecs::world::World
-- Assets<Mesh>::asset_event_system (AssetEvents) and apply_system_buffers (PostUpdateFlush)
conflict on: bevy_ecs::world::World
-- Assets<SkinnedMeshInverseBindposes>::asset_event_system (AssetEvents) and apply_system_buffers (PostUpdateFlush)
conflict on: bevy_ecs::world::World
-- Assets<Image>::asset_event_system (AssetEvents) and apply_system_buffers (PostUpdateFlush)
conflict on: bevy_ecs::world::World
-- Assets<TextureAtlas>::asset_event_system (AssetEvents) and apply_system_buffers (PostUpdateFlush)
conflict on: bevy_ecs::world::World
-- Assets<ColorMaterial>::asset_event_system (AssetEvents) and apply_system_buffers (PostUpdateFlush)
conflict on: bevy_ecs::world::World
-- Assets<Font>::asset_event_system (AssetEvents) and apply_system_buffers (PostUpdateFlush)
conflict on: bevy_ecs::world::World
-- Assets<FontAtlasSet>::asset_event_system (AssetEvents) and apply_system_buffers (PostUpdateFlush)
conflict on: bevy_ecs::world::World
-- Assets<StandardMaterial>::asset_event_system (AssetEvents) and apply_system_buffers (PostUpdateFlush)
conflict on: bevy_ecs::world::World
-- Assets<Gltf>::asset_event_system (AssetEvents) and apply_system_buffers (PostUpdateFlush)
conflict on: bevy_ecs::world::World
-- Assets<GltfNode>::asset_event_system (AssetEvents) and apply_system_buffers (PostUpdateFlush)
conflict on: bevy_ecs::world::World
-- Assets<GltfPrimitive>::asset_event_system (AssetEvents) and apply_system_buffers (PostUpdateFlush)
conflict on: bevy_ecs::world::World
-- Assets<GltfMesh>::asset_event_system (AssetEvents) and apply_system_buffers (PostUpdateFlush)
conflict on: bevy_ecs::world::World
-- Assets<AudioSource>::asset_event_system (AssetEvents) and apply_system_buffers (PostUpdateFlush)
conflict on: bevy_ecs::world::World
-- Assets<AudioSink>::asset_event_system (AssetEvents) and apply_system_buffers (PostUpdateFlush)
conflict on: bevy_ecs::world::World
-- Assets<AnimationClip>::asset_event_system (AssetEvents) and apply_system_buffers (PostUpdateFlush)
conflict on: bevy_ecs::world::World
-- Assets<DynamicScene>::asset_event_system (AssetEvents) and apply_system_buffers (PostUpdateFlush)
conflict on: bevy_ecs::world::World
```
Co-authored-by: Edgar Geier <geieredgar@gmail.com>
# Objective
Allow using `Local<WorldId>` in systems.
## Solution
- Describe the solution used to achieve the objective above.
---
## Changelog
+ `WorldId` now implements the `FromWorld` trait.
…top sort. reduce mem alloc
# Objective
- Reduce alloc count.
- Improve code quality.
## Solution
- use `TarjanScc::run` directly, which calls a closure with each scc, in closure, we can detect cycles and flatten nodes
# Objective
`ChangeTrackers<>` is a `WorldQuery` type that lets you access the change ticks for a component. #7097 has added `Ref<>`, which gives access to a component's value in addition to its change ticks. Since bevy's access model does not separate a component's value from its change ticks, there is no benefit to using `ChangeTrackers<T>` over `Ref<T>`.
## Solution
Deprecate `ChangeTrackers<>`.
---
## Changelog
* `ChangeTrackers<T>` has been deprecated. It will be removed in Bevy 0.11.
## Migration Guide
`ChangeTrackers<T>` has been deprecated, and will be removed in the next release. Any usage should be replaced with `Ref<T>`.
```rust
// Before (0.9)
fn my_system(q: Query<(&MyComponent, ChangeTrackers<MyComponent>)>) {
for (value, trackers) in &q {
if trackers.is_changed() {
// Do something with `value`.
}
}
}
// After (0.10)
fn my_system(q: Query<Ref<MyComponent>>) {
for value in &q {
if value.is_changed() {
// Do something with `value`.
}
}
}
```
# Objective
Fixes#7736
## Solution
Implement the `SystemParam` trait for `WorldId`
## Changelog
- `WorldId` can now be taken as a system parameter and will return the id of the world the system is running in
# Objective
- Fixes#7659.
## Solution
- This PR extracted the `distributive_run_if` part of #7676, because it does not require the controversial introduction of anonymous system sets.
- The distinctive name should make the user aware about the differences between `IntoSystemConfig::run_if` and `IntoSystemConfigs::distributive_run_if`.
- The documentation explains in detail the consequences of using the API and possible pit falls when using it.
- A test demonstrates the possibility of changing the condition result, resulting in some of the systems not being run.
---
## Changelog
### Added
- Add `distributive_run_if` to `IntoSystemConfigs` to enable adding a run condition to each system when using `add_systems`.
follow-up to https://github.com/bevyengine/bevy/pull/7716
# Objective
System access is only populated in `System::initialize`, so without calling `initialize` it's actually impossible to see most ambiguities.
## Solution
- make `initialize` public. The method is idempotent, so calling it multiple times doesn't hurt
# Objective
Continuation of https://github.com/bevyengine/bevy/pull/5719
Now that we have a definable type for the iterator.
---
## Changelog
- Implemented IntoIterator for EventReader so you can now do `&mut reader` instead of `reader.iter()` for events.
# Objective
Fix#7440. Fix#7441.
## Solution
* Remove builder functions on `ScheduleBuildSettings` in favor of public fields, move docs to the fields.
* Add `use_shortnames` and use it in `get_node_name` to feed it through `bevy_utils::get_short_name`.
# Objective
Web builds do not support running on multiple threads right now. Defaulting to the multi-threaded executor has significant overhead without any benefit.
## Solution
Default to the single threaded executor on wasm32 builds.
# Objective
- other tools (bevy_mod_debugdump) would like to have access to the ambiguities so that they can do their own reporting/visualization
## Solution
- store `conflicting_systems` in `ScheduleGraph` after calling `build_schedule`
The solution isn't very pretty and as pointed out it https://github.com/bevyengine/bevy/pull/7522, there may be a better way of exposing this, but this is the quick and dirty way if we want to have this functionality exposed in 0.10.
# Objective
- RemovedComponents is just a thin wrapper around Events/ManualEventReader which is the same as an EventReader, so most usecases that of an EventReader will probably be useful for RemovedComponents too.
I was thinking of making a trait for this but I don't think it is worth the overhead currently.
## Solution
- Mirror the api surface of EventReader
# Objective
Motivated by #7469.
`EventReader` iterators use the default implementations for `.nth()` and `.last()`, which includes iterating over and throwing out all events before the desired one.
## Solution
Add specialized implementations for these methods that directly updates the unread event counter and returns a reference to the desired event.
TODO:
- [x] Add a unit test.
- [x] ~~Add a benchmark, to see if the compiler was doing this automatically already.~~ *On second thought, this doesn't feel like a very useful thing to include in the benchmark suite.*
# Objective
- it would be nice to be able to associate a `NodeId` of a system type set to the `NodeId` of the actual system (used in bevy_mod_debugdump)
## Solution
- make `system_type` return the type id of the system
- that way you can check if a `dyn SystemSet` is the system type set of a `dyn System`
- I don't know if this information is already present somewhere else in the scheduler or if there is a better way to expose it
# Objective
Fixes#7702.
## Solution
- Added an test that ensures that no error is returned if a system or set is inside two different sets that share the same base set.
- Added an check to only return an error if the two base sets are not equal.
# Objective
The `ScheduleGraph` should be expose so that crates like [bevy_mod_debugdump](https://github.com/jakobhellermann/bevy_mod_debugdump/blob/stageless/docs/README.md) can access useful information.
## Solution
- expose `ScheduleGraph`, `NodeId`, `BaseSetMembership`, `Dag`
- add accessor functions for sets and systems
## Changelog
- expose `ScheduleGraph` for use in third party tools
This does expose our use of `petgraph` as a graph library, so we can only change that as a breaking change.
# Objective
- Fixes#5432
- Fixes#6680
## Solution
- move code responsible for generating the `impl TypeUuid` from `type_uuid_derive` into a new function, `gen_impl_type_uuid`.
- this allows the new proc macro, `impl_type_uuid`, to call the code for generation.
- added struct `TypeUuidDef` and implemented `syn::Parse` to allow parsing of the input for the new macro.
- finally, used the new macro `impl_type_uuid` to implement `TypeUuid` for the standard library (in `crates/bevy_reflect/src/type_uuid_impl.rs`).
- fixes#6680 by doing a wrapping add of the param's index to its `TYPE_UUID`
Co-authored-by: dis-da-moe <84386186+dis-da-moe@users.noreply.github.com>
# Objective
The trait `Condition<>` is implemented for any type that can be converted into a `ReadOnlySystem` which takes no inputs and returns a bool. However, due to the current implementation, consumers of the trait cannot rely on the fact that `<T as Condition>::System` implements `ReadOnlySystem`. In cases such as the `not` combinator (added in #7559), we are required to add redundant `T::System: ReadOnlySystem` trait bounds, even though this should be implied by the `Condition<>` trait.
## Solution
Add a hidden associated type which allows the compiler to figure out that the `System` associated type implements `ReadOnlySystem`.
…able like Table. Rename clear to clear_entities to clarify that metadata keeps, only value cleared
# Objective
- Provide some inspectability for SparseSets.
## Solution
- `Tables` has these three methods, len, is_empty and iter too. Add these methods to `SparseSets`, so user can print the shape of storage.
---
## Changelog
> This section is optional. If this was a trivial fix, or has no externally-visible impact, you can delete this section.
- Add `len`, `is_empty`, `iter` methods on SparseSets.
- Rename `clear` to `clear_entities` to clarify its purpose.
- Add `new_for_test` on `ComponentInfo` to make test code easy.
- Add test case covering new methods.
## Migration Guide
> This section is optional. If there are no breaking changes, you can delete this section.
- Simply adding new functionality is not a breaking change.
# Objective
This PR improves message that caused by duplicate components in bundle.
## Solution
Show names of duplicate components.
The solution is not very elegant, in my opinion, I will be happy to listen to suggestions for improving it
Co-authored-by: Саня Череп <41489405+SDesya74@users.noreply.github.com>
# Objective
While porting my crate `bevy_trait_query` to bevy 0.10, I ran into an issue with the `DetectChangesMut` trait. Due to the way that the `set_if_neq` method (added in #6853) is implemented, you are forced to write a nonsense implementation of it for dynamically sized types. This edge case shows up when implementing trait queries, since `DetectChangesMut` is implemented for `Mut<dyn Trait>`.
## Solution
Simplify the generics for `set_if_neq` and add the `where Self::Target: Sized` trait bound to it. Add a default implementation so implementers don't need to implement a method with nonsensical trait bounds.
# Objective
The `SystemParamFunction` (and `ExclusiveSystemParamFunction`) trait is very cumbersome to use, due to it requiring four generic type parameters. These are currently all used as marker parameters to satisfy rust's trait coherence rules.
### Example (before)
```rust
pub fn pipe<AIn, Shared, BOut, A, AParam, AMarker, B, BParam, BMarker>(
mut system_a: A,
mut system_b: B,
) -> impl FnMut(In<AIn>, ParamSet<(AParam, BParam)>) -> BOut
where
A: SystemParamFunction<AIn, Shared, AParam, AMarker>,
B: SystemParamFunction<Shared, BOut, BParam, BMarker>,
AParam: SystemParam,
BParam: SystemParam,
```
## Solution
Turn the `In`, `Out`, and `Param` generics into associated types. Merge the marker types together to retain coherence.
### Example (after)
```rust
pub fn pipe<A, B, AMarker, BMarker>(
mut system_a: A,
mut system_b: B,
) -> impl FnMut(In<A::In>, ParamSet<(A::Param, B::Param)>) -> B::Out
where
A: SystemParamFunction<AMarker>,
B: SystemParamFunction<BMarker, In = A::Out>,
```
---
## Changelog
+ Simplified the `SystemParamFunction` and `ExclusiveSystemParamFunction` traits.
## Migration Guide
For users of the `SystemParamFunction` trait, the generic type parameters `In`, `Out`, and `Param` have been turned into associated types. The same has been done with the `ExclusiveSystemParamFunction` trait.
# Objective
- #6402 changed `World::fetch_table` (now `UnsafeWorldCell::fetch_table`) to access the archetype in order to get the `table_id` and `table_row` of the entity involved. However this is useless since those were already present in the `EntityLocation`
- Moreover it's useless for `UnsafeWorldCell::fetch_table` to return the `TableRow` too, since the caller must already have access to the `EntityLocation` which contains the `TableRow`.
- The result is that `UnsafeWorldCell::fetch_table` now only does 2 memory fetches instead of 4.
## Solution
- Revert the changes to the implementation of `UnsafeWorldCell::fetch_table` made in #6402
…u64, so hash safety is not a concern
# Objective
- While reading the code, just noticed the BundleInfo's HashMap is std::collections::HashMap, which uses a slow but safe hasher.
## Solution
- Use bevy_utils::HashMap instead
benchmark diff (I run several times in a linux box, the perf improvement is consistent, though numbers varies from time to time, I paste my last run result here):
``` bash
cargo bench -- spawn
Compiling bevy_ecs v0.9.0 (/home/lishuo/developer/pr/bevy/crates/bevy_ecs)
Compiling bevy_app v0.9.0 (/home/lishuo/developer/pr/bevy/crates/bevy_app)
Compiling benches v0.1.0 (/home/lishuo/developer/pr/bevy/benches)
Finished bench [optimized] target(s) in 1m 17s
Running benches/bevy_ecs/change_detection.rs (/home/lishuo/developer/pr/bevy/benches/target/release/deps/change_detection-86c5445d0dc34529)
Gnuplot not found, using plotters backend
Running benches/bevy_ecs/benches.rs (/home/lishuo/developer/pr/bevy/benches/target/release/deps/ecs-e49b3abe80bfd8c0)
Gnuplot not found, using plotters backend
spawn_commands/2000_entities
time: [153.94 µs 159.19 µs 164.37 µs]
change: [-14.706% -11.050% -6.9633%] (p = 0.00 < 0.05)
Performance has improved.
spawn_commands/4000_entities
time: [328.77 µs 339.11 µs 349.11 µs]
change: [-7.6331% -3.9932% +0.0487%] (p = 0.06 > 0.05)
No change in performance detected.
spawn_commands/6000_entities
time: [445.01 µs 461.29 µs 477.36 µs]
change: [-16.639% -13.358% -10.006%] (p = 0.00 < 0.05)
Performance has improved.
spawn_commands/8000_entities
time: [657.94 µs 677.71 µs 696.95 µs]
change: [-8.8708% -5.2591% -1.6847%] (p = 0.01 < 0.05)
Performance has improved.
get_or_spawn/individual time: [452.02 µs 466.70 µs 482.07 µs]
change: [-17.218% -14.041% -10.728%] (p = 0.00 < 0.05)
Performance has improved.
get_or_spawn/batched time: [291.12 µs 301.12 µs 311.31 µs]
change: [-12.281% -8.9163% -5.3660%] (p = 0.00 < 0.05)
Performance has improved.
spawn_world/1_entities time: [81.668 ns 84.284 ns 86.860 ns]
change: [-12.251% -6.7872% -1.5402%] (p = 0.02 < 0.05)
Performance has improved.
spawn_world/10_entities time: [789.78 ns 821.96 ns 851.95 ns]
change: [-19.738% -14.186% -8.0733%] (p = 0.00 < 0.05)
Performance has improved.
spawn_world/100_entities
time: [7.9906 µs 8.2449 µs 8.5013 µs]
change: [-12.417% -6.6837% -0.8766%] (p = 0.02 < 0.05)
Change within noise threshold.
spawn_world/1000_entities
time: [81.602 µs 84.161 µs 86.833 µs]
change: [-13.656% -8.6520% -3.0491%] (p = 0.00 < 0.05)
Performance has improved.
Found 1 outliers among 100 measurements (1.00%)
1 (1.00%) high mild
Benchmarking spawn_world/10000_entities: Warming up for 500.00 ms
Warning: Unable to complete 100 samples in 4.0s. You may wish to increase target time to 4.0s, enable flat sampling, or reduce sample count to 70.
spawn_world/10000_entities
time: [813.02 µs 839.76 µs 865.41 µs]
change: [-12.133% -6.1970% -0.2302%] (p = 0.05 < 0.05)
Change within noise threshold.
```
---
## Changelog
> This section is optional. If this was a trivial fix, or has no externally-visible impact, you can delete this section.
- use bevy_utils::HashMap for Bundles::bundle_ids
## Migration Guide
> This section is optional. If there are no breaking changes, you can delete this section.
- Not a breaking change, hashmap is internal impl.
# Objective
We have a few old system labels that are now system sets but are still named or documented as labels. Documentation also generally mentioned system labels in some places.
## Solution
- Clean up naming and documentation regarding system sets
## Migration Guide
`PrepareAssetLabel` is now called `PrepareAssetSet`
# Objective
- Improve readability of the run condition for systems only running in a certain state
## Solution
- Rename `state_equals` to `in_state` (see [comment by cart](https://github.com/bevyengine/bevy/pull/7634#issuecomment-1428740311) in #7634 )
- `.run_if(state_equals(variant))` now is `.run_if(in_state(variant))`
This breaks the naming pattern a bit with the related conditions `state_exists` and `state_exists_and_equals` but I could not think of better names for those and think the improved readability of `in_state` is worth it.
# Objective
Fixes#7632.
As discussed in #7634, it can be quite challenging for users to intuit the mental model of how states now work.
## Solution
Rather than change the behavior of the `OnUpdate` system set, instead work on making sure it's easy to understand what's going on.
Two things have been done:
1. Remove the `.on_update` method from our bevy of system building traits. This was special-cased and made states feel much more magical than they need to.
2. Improve the docs for the `OnUpdate` system set.
# Objective
- Fixes: #7187
Since avoiding the `SRes::into_inner` call does not seem to be possible, this PR tries to at least document its usage.
I am not sure if I explained the lifetime issue correctly, please let me know if something is incorrect.
## Solution
- Add information about the `SRes::into_inner` usage on both `RenderCommand` and `Res`
# Objective
Related to #7530.
`EventReader` iterators currently use the default impl for `.count()`, which unnecessarily loops over all unread events.
# Solution
Add specialized impls that mark the `EventReader` as consumed and return the number of unread events.
# Objective
Make the name less verbose without sacrificing clarity.
---
## Migration Guide
*Note for maintainers:* This PR has no breaking changes relative to bevy 0.9. Instead of this PR having its own migration guide, we should just edit the changelog for #6404.
The type `UnsafeWorldCellEntityRef` has been renamed to `UnsafeEntityCell`.
# Objective
Continuation of #7560.
`MutUntyped::last_changed` and `set_last_changed` do not behave as described in their docs.
## Solution
Fix them using the same approach that was used for `Mut<>` in #7560.
# Objective
Make `last_changed` behave as described in its docs.
## Solution
- Return `changed` instead of `last_change_tick`. `last_change_tick` is the system's previous tick and is just used for comparison.
- Update the docs of the similarly named `set_last_changed` (which does correctly interact with `last_change_tick`) to clarify that the two functions touch different data. (I advocate for renaming one or the other if anyone has any good suggestions).
It also might make sense to return a cloned `Tick` instead of `u32`.
---
## Changelog
- Fixed `DetectChanges::last_changed` returning the wrong value.
- Fixed `DetectChangesMut::set_last_changed` not actually updating the `changed` tick.
## Migration Guide
- The incorrect value that was being returned by `DetectChanges::last_changed` was the previous run tick of the system checking for changed values. If you depended on this value, you can get it from the `SystemChangeTick` `SystemParam` instead.
# Objective
Clarify what the function is actually calculating.
The `Tick::is_older_than` function is actually calculating whether the tick is newer than the system's `last_change_tick`, not older. As far as I can tell, the engine was using it correctly everywhere already.
## Solution
- Rename the function.
---
## Changelog
- `Tick::is_older_than` was renamed to `Tick::is_newer_than`. This is not a functional change, since that was what was always being calculated, despite the wrong name.
## Migration Guide
- Replace usages of `Tick::is_older_than` with `Tick::is_newer_than`.
# Objective
Closes#7202
## Solution
~~Introduce a `not` helper to pipe conditions. Opened mostly for discussion. Maybe create an extension trait with `not` method? Please, advice.~~
Introduce `not(condition)` condition that inverses the result of the passed.
---
## Changelog
### Added
- `not` condition.
Small commit to remove an unused resource scoped within a single bevy_ecs unit test. Also rearranged the initialization to follow initialization conventions of surrounding tests. World/Schedule initialization followed by resource initialization.
This change was tested locally with `cargo test`, and `cargo fmt` was run.
Risk should be tiny as change is scoped to a single unit test and very tiny, and I can't see any way that this resource is being used in the test.
Thank you so much!
# Objective
Run conditions are a special type of system that do not modify the world, and which return a bool. Due to the way they are currently implemented, you can *only* use bare function systems as a run condition. Among other things, this prevents the use of system piping with run conditions. This make very basic constructs impossible, such as `my_system.run_if(my_condition.pipe(not))`.
Unblocks a basic solution for #7202.
## Solution
Add the trait `ReadOnlySystem`, which is implemented for any system whose parameters all implement `ReadOnlySystemParam`. Allow any `-> bool` system implementing this trait to be used as a run condition.
---
## Changelog
+ Added the trait `ReadOnlySystem`, which is implemented for any `System` type whose parameters all implement `ReadOnlySystemParam`.
+ Added the function `bevy::ecs::system::assert_is_read_only_system`.
# Objective
Implementing `States` manually is repetitive, so let's not.
One thing I'm unsure of is whether the macro import statement is in the right place.
# Objective
One pattern to increase parallelism is deferred mutation: instead of directly mutating the world (and preventing other systems from running at the same time), you queue up operations to be applied to the world at the end of the stage. The most common example of this pattern uses the `Commands` SystemParam.
In order to avoid the overhead associated with commands, some power users may want to add their own deferred mutation behavior. To do this, you must implement the unsafe trait `SystemParam`, which interfaces with engine internals in a way that we'd like users to be able to avoid.
## Solution
Add the `Deferred<T>` primitive `SystemParam`, which encapsulates the deferred mutation pattern.
This can be combined with other types of `SystemParam` to safely and ergonomically create powerful custom types.
Essentially, this is just a variant of `Local<T>` which can run code at the end of the stage.
This type is used in the engine to derive `Commands` and `ParallelCommands`, which removes a bunch of unsafe boilerplate.
### Example
```rust
use bevy_ecs::system::{Deferred, SystemBuffer};
/// Sends events with a delay, but may run in parallel with other event writers.
#[derive(SystemParam)]
pub struct BufferedEventWriter<'s, E: Event> {
queue: Deferred<'s, EventQueue<E>>,
}
struct EventQueue<E>(Vec<E>);
impl<'s, E: Event> BufferedEventWriter<'s, E> {
/// Queues up an event to be sent at the end of this stage.
pub fn send(&mut self, event: E) {
self.queue.0.push(event);
}
}
// The `SystemBuffer` trait controls how [`Deferred`] gets applied at the end of the stage.
impl<E: Event> SystemBuffer for EventQueue<E> {
fn apply(&mut self, world: &mut World) {
let mut events = world.resource_mut::<Events<E>>();
for e in self.0.drain(..) {
events.send(e);
}
}
}
```
---
## Changelog
+ Added the `SystemParam` type `Deferred<T>`, which can be used to defer `World` mutations. Powered by the new trait `SystemBuffer`.
