Crate bevy

Bevy is an open-source modular game engine built in Rust, with a focus on developer productivity and performance.

Check out the Bevy website for more information, read the Bevy Book for a step-by-step guide, and engage with our community if you have any questions or ideas!

Example

Here is a simple “Hello World” Bevy app:

use bevy::prelude::*;

fn main() {
   App::new()
       .add_systems(Update, hello_world_system)
       .run();
}

fn hello_world_system() {
   println!("hello world");
}

Don’t let the simplicity of the example above fool you. Bevy is a fully featured game engine and it gets more powerful every day!

This Crate

The bevy crate is just a container crate that makes it easier to consume Bevy subcrates. The defaults provide a “full” engine experience, but you can easily enable / disable features in your project’s Cargo.toml to meet your specific needs. See Bevy’s Cargo.toml for a full list of features available.

If you prefer, you can also consume the individual bevy crates directly. Each module in the root of this crate, except for the prelude, can be found on crates.io with bevy_ appended to the front, e.g. app -> bevy_app.

Cargo Features

Bevy exposes many features to customise the engine. Enabling them add functionalities but often come at the cost of longer compilation times and extra dependencies.

Default Features

The default feature set enables most of the expected features of a game engine, like rendering in both 2D and 3D, asset loading, audio and UI. To help reduce compilation time, consider disabling default features and enabling only those you need.

feature name	description
android_shared_stdcxx	Enable using a shared stdlib for cxx on Android
animation	Enable animation support, and glTF animation loading
bevy_animation	Provides animation functionality
bevy_asset	Provides asset functionality
bevy_audio	Provides audio functionality
bevy_core_pipeline	Provides cameras and other basic render pipeline features
bevy_gilrs	Adds gamepad support
bevy_gizmos	Adds support for rendering gizmos
bevy_gltf	glTF support
bevy_pbr	Adds PBR rendering
bevy_render	Provides rendering functionality
bevy_scene	Provides scene functionality
bevy_sprite	Provides sprite functionality
bevy_text	Provides text functionality
bevy_ui	A custom ECS-driven UI framework
bevy_winit	winit window and input backend
default_font	Include a default font, containing only ASCII characters, at the cost of a 20kB binary size increase
hdr	HDR image format support
ktx2	KTX2 compressed texture support
multi-threaded	Enables multithreaded parallelism in the engine. Disabling it forces all engine tasks to run on a single thread.
png	PNG image format support
tonemapping_luts	Include tonemapping Look Up Tables KTX2 files. If everything is pink, you need to enable this feature or change the Tonemapping method on your Camera2dBundle or Camera3dBundle.
vorbis	OGG/VORBIS audio format support
webgl2	Enable some limitations to be able to use WebGL2. If not enabled, it will default to WebGPU in Wasm. Please refer to the WebGL2 and WebGPU section of the examples README for more information on how to run Wasm builds with WebGPU.
x11	X11 display server support
zstd	For KTX2 supercompression

Optional Features

feature name	description
accesskit_unix	Enable AccessKit on Unix backends (currently only works with experimental screen readers and forks.)
asset_processor	Enables the built-in asset processor for processed assets.
async-io	Use async-io’s implementation of block_on instead of futures-lite’s implementation. This is preferred if your application uses async-io.
basis-universal	Basis Universal compressed texture support
bevy_ci_testing	Enable systems that allow for automated testing on CI
bevy_dynamic_plugin	Plugin for dynamic loading (using libloading)
bmp	BMP image format support
dds	DDS compressed texture support
debug_glam_assert	Enable assertions in debug builds to check the validity of parameters passed to glam
detailed_trace	Enable detailed trace event logging. These trace events are expensive even when off, thus they require compile time opt-in
dynamic_linking	Force dynamic linking, which improves iterative compile times
embedded_watcher	Enables watching in memory asset providers for Bevy Asset hot-reloading
exr	EXR image format support
file_watcher	Enables watching the filesystem for Bevy Asset hot-reloading
flac	FLAC audio format support
glam_assert	Enable assertions to check the validity of parameters passed to glam
jpeg	JPEG image format support
minimp3	MP3 audio format support (through minimp3)
mp3	MP3 audio format support
pbr_transmission_textures	Enable support for transmission-related textures in the StandardMaterial, at the risk of blowing past the global, per-shader texture limit on older/lower-end GPUs
pnm	PNM image format support, includes pam, pbm, pgm and ppm
serialize	Enable serialization support through serde
shader_format_glsl	Enable support for shaders in GLSL
shader_format_spirv	Enable support for shaders in SPIR-V
subpixel_glyph_atlas	Enable rendering of font glyphs using subpixel accuracy
symphonia-aac	AAC audio format support (through symphonia)
symphonia-all	AAC, FLAC, MP3, MP4, OGG/VORBIS, and WAV audio formats support (through symphonia)
symphonia-flac	FLAC audio format support (through symphonia)
symphonia-isomp4	MP4 audio format support (through symphonia)
symphonia-vorbis	OGG/VORBIS audio format support (through symphonia)
symphonia-wav	WAV audio format support (through symphonia)
tga	TGA image format support
trace	Tracing support
trace_chrome	Tracing support, saving a file in Chrome Tracing format
trace_tracy	Tracing support, exposing a port for Tracy
trace_tracy_memory	Tracing support, with memory profiling, exposing a port for Tracy
wav	WAV audio format support
wayland	Wayland display server support
webp	WebP image format support
wgpu_trace	Save a trace of all wgpu calls
zlib	For KTX2 supercompression

Modules

• a11y
  Integrate with platform accessibility APIs.
• animation
  Provides types and plugins for animations.
• app
  Build bevy apps, create plugins, and read events.
• asset
  Load and store assets and resources for Apps.
• audio
  Provides types and plugins for audio playback.
• core
  Contains core plugins.
• core_pipeline
  Core render pipeline.
• diagnostic
  Useful diagnostic plugins and types for bevy apps.
• dynamic_plugin
  Dynamic linking of plugins
• ecs
  Bevy’s entity-component-system.
• gilrs
  Bevy interface with GilRs - “Game Input Library for Rust” - to handle gamepad inputs.
• gizmos
  Immediate mode drawing api for visual debugging.
• gltf
  Support for GLTF file loading.
• hierarchy
  Entity hierarchies and property inheritance
• input
  Resources and events for inputs, e.g. mouse/keyboard, touch, gamepads, etc.
• log
  Logging capabilities
• math
  Math types (Vec3, Mat4, Quat, etc) and helpers.
• pbr
  Physically based rendering.
• prelude
  use bevy::prelude::*; to import common components, bundles, and plugins.
• ptr
  Utilities for working with untyped pointers in a more safe way.
• reflect
  Type reflection used for dynamically interacting with rust types.
• render
  Cameras, meshes, textures, shaders, and pipelines. Use RenderDevice::features, RenderDevice::limits, and the RenderAdapterInfo resource to get runtime information about the actual adapter, backend, features, and limits.
• scene
  Save/load collections of entities and components to/from file.
• sprite
  Items for sprites, rects, texture atlases, etc.
• tasks
  Pools for async, IO, and compute tasks.
• text
  Text drawing, styling, and font assets.
• time
  Contains time utilities.
• transform
  Local and global transforms (e.g. translation, scale, rotation).
• ui
  User interface components and widgets.
• utils
  Various miscellaneous utilities for easing development
• window
  Configuration, creation, and management of one or more windows.
• winit
  Window creation, configuration, and handling

Structs

• DefaultPlugins
  This plugin group will add all the default plugins for a Bevy application:
• MinimalPlugins
  This plugin group will add the minimal plugins for a Bevy application: