bevy/crates/bevy_ecs/Cargo.toml
Zachary Harrold f45e78e658
Add no_std support to bevy_app (#16874)
# Objective

- Contributes to #15460

## Solution

- Added the following features:
  - `std` (default)
  - `bevy_tasks` (default)
  - `downcast ` (default)
  - `portable-atomic`
  - `critical-section`
- `downcast` and `bevy_tasks` are now optional dependencies for
`bevy_app`.

## Testing

- CI
- Personal UEFI and Raspberry Pi Pico demo applications compile and run
against this branch

## Draft Release Notes

Bevy's application framework now supports `no_std` platforms.

Following up on `bevy_ecs` gaining `no_std` support, `bevy_app` extends
the functionality available on these targets to include the powerful
`App` and `Plugin` abstractions. With this, library authors now have the
option of making their plugins `no_std` compatible, or even offering
plugins specifically to improve Bevy on certain embedded platforms!

To start making a `no_std` compatible plugin, simply disable default
features when including `bevy_app`:

```toml
[dependencies]
bevy_app = { version = "0.16", default-features = false }
```

We encourage library authors to do this anyway, as it can also help with
compile times and binary size on all platforms.

Keep an eye out for future `no_std` updates as we continue to improve
the parity between `std` and `no_std`. We look forward to seeing what
kinds of applications are now possible with Bevy!

## Notes

- `downcast-rs` is optional as it isn't compatible with
`portable-atomic`. I will investigate making a PR upstream to add
support for this functionality, as it should be very straightforward.
- In line with the `bevy_ecs` no-std-ification, I've added documentation
to all features, and grouped them as well.
- ~~Creating this PR in draft while CI runs and so I can polish before
review.~~

---------

Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
2024-12-18 22:04:45 +00:00

161 lines
5.0 KiB
TOML

[package]
name = "bevy_ecs"
version = "0.15.0-dev"
edition = "2021"
description = "Bevy Engine's entity component system"
homepage = "https://bevyengine.org"
repository = "https://github.com/bevyengine/bevy"
license = "MIT OR Apache-2.0"
keywords = ["ecs", "game", "bevy"]
categories = ["game-engines", "data-structures"]
rust-version = "1.81.0"
[features]
default = ["std", "bevy_reflect", "async_executor"]
# Functionality
## Enables multithreading support. Schedules will attempt to run systems on
## multiple threads whenever possible.
multi_threaded = ["bevy_tasks/multi_threaded", "dep:arrayvec"]
## Adds serialization support through `serde`.
serialize = ["dep:serde", "bevy_utils/serde"]
## Adds runtime reflection support using `bevy_reflect`.
bevy_reflect = ["dep:bevy_reflect"]
## Extends reflection support to functions.
reflect_functions = ["bevy_reflect", "bevy_reflect/functions"]
# Debugging Features
## Enables `tracing` integration, allowing spans and other metrics to be reported
## through that framework.
trace = ["std", "dep:tracing", "bevy_utils/tracing"]
## Enables a more detailed set of traces which may be noisy if left on by default.
detailed_trace = ["trace"]
## Provides system stepping support, allowing them to be paused, stepped, and
## other debug operations which can help with diagnosing certain behaviors.
bevy_debug_stepping = []
## Provides more detailed tracking of the cause of various effects within the ECS.
## This will often provide more detailed error messages.
track_change_detection = []
# Executor Backend
## Uses `async-executor` as a task execution backend.
## This backend is incompatible with `no_std` targets.
async_executor = ["dep:bevy_tasks", "std", "bevy_tasks/async_executor"]
## Uses `edge-executor` as a task execution backend.
## Use this instead of `async-executor` if working on a `no_std` target.
edge_executor = ["dep:bevy_tasks", "bevy_tasks/edge_executor"]
# Platform Compatibility
## Allows access to the `std` crate. Enabling this feature will prevent compilation
## on `no_std` targets, but provides access to certain additional features on
## supported platforms.
std = [
"bevy_reflect?/std",
"bevy_tasks/std",
"bevy_utils/std",
"bitflags/std",
"concurrent-queue/std",
"disqualified/alloc",
"fixedbitset/std",
"indexmap/std",
"serde?/std",
"nonmax/std",
"arrayvec?/std",
"log/std",
]
## `critical-section` provides the building blocks for synchronization primitives
## on all platforms, including `no_std`.
critical-section = [
"dep:critical-section",
"bevy_tasks?/critical-section",
"portable-atomic?/critical-section",
]
## `portable-atomic` provides additional platform support for atomic types and
## operations, even on targets without native support.
portable-atomic = [
"dep:portable-atomic",
"dep:portable-atomic-util",
"bevy_tasks?/portable-atomic",
"concurrent-queue/portable-atomic",
"spin/portable_atomic",
]
[dependencies]
bevy_ptr = { path = "../bevy_ptr", version = "0.15.0-dev" }
bevy_reflect = { path = "../bevy_reflect", version = "0.15.0-dev", default-features = false, optional = true }
bevy_tasks = { path = "../bevy_tasks", version = "0.15.0-dev", default-features = false, optional = true }
bevy_utils = { path = "../bevy_utils", version = "0.15.0-dev", default-features = false, features = [
"alloc",
] }
bevy_ecs_macros = { path = "macros", version = "0.15.0-dev" }
bitflags = { version = "2.3", default-features = false }
concurrent-queue = { version = "2.5.0", default-features = false }
disqualified = { version = "1.0", default-features = false }
fixedbitset = { version = "0.5", default-features = false }
serde = { version = "1", default-features = false, features = [
"alloc",
], optional = true }
thiserror = { version = "2", default-features = false }
derive_more = { version = "1", default-features = false, features = [
"from",
"display",
"into",
"as_ref",
] }
nonmax = { version = "0.5", default-features = false }
arrayvec = { version = "0.7.4", default-features = false, optional = true }
smallvec = { version = "1", features = ["union"] }
indexmap = { version = "2.5.0", default-features = false }
variadics_please = { version = "1.1", default-features = false }
critical-section = { version = "1.2.0", optional = true }
portable-atomic = { version = "1", default-features = false, features = [
"fallback",
], optional = true }
portable-atomic-util = { version = "0.2.4", features = [
"alloc",
], optional = true }
spin = { version = "0.9.8", default-features = false, features = [
"spin_mutex",
"rwlock",
] }
tracing = { version = "0.1", default-features = false, optional = true }
log = { version = "0.4", default-features = false }
bumpalo = "3"
[dev-dependencies]
rand = "0.8"
static_assertions = "1.1.0"
[[example]]
name = "events"
path = "examples/events.rs"
[[example]]
name = "resources"
path = "examples/resources.rs"
[[example]]
name = "change_detection"
path = "examples/change_detection.rs"
[lints]
workspace = true
[package.metadata.docs.rs]
rustdoc-args = ["-Zunstable-options", "--generate-link-to-definition"]
all-features = true