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# Objective - Support WebGPU - alternative to #5027 that doesn't need any async / await - fixes #8315 - Surprise fix #7318 ## Solution ### For async renderer initialisation - Update the plugin lifecycle: - app builds the plugin - calls `plugin.build` - registers the plugin - app starts the event loop - event loop waits for `ready` of all registered plugins in the same order - returns `true` by default - then call all `finish` then all `cleanup` in the same order as registered - then execute the schedule In the case of the renderer, to avoid anything async: - building the renderer plugin creates a detached task that will send back the initialised renderer through a mutex in a resource - `ready` will wait for the renderer to be present in the resource - `finish` will take that renderer and place it in the expected resources by other plugins - other plugins (that expect the renderer to be available) `finish` are called and they are able to set up their pipelines - `cleanup` is called, only custom one is still for pipeline rendering ### For WebGPU support - update the `build-wasm-example` script to support passing `--api webgpu` that will build the example with WebGPU support - feature for webgl2 was always enabled when building for wasm. it's now in the default feature list and enabled on all platforms, so check for this feature must also check that the target_arch is `wasm32` --- ## Migration Guide - `Plugin::setup` has been renamed `Plugin::cleanup` - `Plugin::finish` has been added, and plugins adding pipelines should do it in this function instead of `Plugin::build` ```rust // Before impl Plugin for MyPlugin { fn build(&self, app: &mut App) { app.insert_resource::<MyResource> .add_systems(Update, my_system); let render_app = match app.get_sub_app_mut(RenderApp) { Ok(render_app) => render_app, Err(_) => return, }; render_app .init_resource::<RenderResourceNeedingDevice>() .init_resource::<OtherRenderResource>(); } } // After impl Plugin for MyPlugin { fn build(&self, app: &mut App) { app.insert_resource::<MyResource> .add_systems(Update, my_system); let render_app = match app.get_sub_app_mut(RenderApp) { Ok(render_app) => render_app, Err(_) => return, }; render_app .init_resource::<OtherRenderResource>(); } fn finish(&self, app: &mut App) { let render_app = match app.get_sub_app_mut(RenderApp) { Ok(render_app) => render_app, Err(_) => return, }; render_app .init_resource::<RenderResourceNeedingDevice>(); } } ```
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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 |
| filesystem_watcher | Enable watching file system for asset hot reload |
| hdr | HDR image format support |
| ktx2 | KTX2 compressed texture support |
| png | PNG image format support |
| tonemapping_luts | Include tonemapping Look Up Tables KTX2 files |
| 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 |
| 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.) |
| 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_asset_server | Enable the "debug asset server" for hot reloading internal assets |
| 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 |
| exr | EXR image format support |
| 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 |
| 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 |