Add feature flag to enable wasm for bevy_audio (#2397)

Exposes Rodio feature flag to enable WASM support.

Note that mp3 doesn't currently work on wasm.

Cargo.toml

@@ -66,6 +66,9 @@ mp3 = ["bevy_internal/mp3"]
 vorbis = ["bevy_internal/vorbis"]
 wav = ["bevy_internal/wav"]
 
+# WASM support for audio (Currently only works with flac, wav and vorbis. Not with mp3)
+wasm_audio = ["bevy_internal/wasm_audio"]
+
 serialize = ["bevy_internal/serialize"]
 
 # Display server protocol support (X11 is enabled by default)

crates/bevy_audio/Cargo.toml

@@ -30,3 +30,4 @@ mp3 = ["rodio/mp3"]
 flac = ["rodio/flac"]
 wav = ["rodio/wav"]
 vorbis = ["rodio/vorbis"]
+wasm_audio = ["rodio/wasm-bindgen"]

crates/bevy_internal/Cargo.toml

@@ -32,6 +32,9 @@ mp3 = ["bevy_audio/mp3"]
 vorbis = ["bevy_audio/vorbis"]
 wav = ["bevy_audio/wav"]
 
+# WASM support for audio
+wasm_audio = ["bevy_audio/wasm_audio"]
+
 serialize = ["bevy_input/serialize"]
 
 # Display server protocol support (X11 is enabled by default)

docs/cargo_features.md

@@ -31,6 +31,7 @@
 |flac|FLAC audio format support. It's included in bevy_audio feature.|
 |wav|WAV audio format support.|
 |vorbis|Vorbis audio format support.|
+|wasm_audio|WASM audio support. (Currently only works with flac, wav and vorbis. Not with mp3)|
 |serialize|Enables serialization of `bevy_input` types.|
 |wayland|Enable this to use Wayland display server protocol other than X11.|
 |subpixel_glyph_atlas|Enable this to cache glyphs using subpixel accuracy. This increases texture memory usage as each position requires a separate sprite in the glyph atlas, but provide more accurate character spacing.|