1 files changed, 96 insertions, 0 deletions
diff --git a/src/audio.rs b/src/audio.rs
new file mode 100644
index 0000000..2b190de
--- /dev/null
+++ b/src/audio.rs
@@ -0,0 +1,96 @@
+use std::{cell::RefCell, collections::HashMap};
+
+pub struct Context {
+    pub audio: web_sys::AudioContext,
+}
+
+impl Context {
+    pub fn new() -> Self {
+        let audio = web_sys::AudioContext::new()
+            .expect("failed to create audio context");
+        Self {
+            audio,
+        }
+    }
+}
+
+pub struct Audio {
+    pub buffer: &'static RefCell<Option<web_sys::AudioBuffer>>,
+    //pub source: &'static web_sys::AudioBufferSourceNode,
+}
+
+impl Audio {
+    pub fn new(ctx: &Context, bytes: &[u8]) -> Self {
+        let sbuffer: &_ = Box::leak(Box::new(RefCell::new(None)));
+        let sclone: &'static RefCell<Option<web_sys::AudioBuffer>> =
+            <&_>::clone(&sbuffer);
+        let ret = Audio {
+            buffer: sclone,
+        };
+        let jsp = ctx.audio.decode_audio_data(&js_sys::Uint8Array::from(bytes).buffer()).expect("failed to decode audio");
+        let promise = wasm_bindgen_futures::JsFuture::from(jsp);
+        wasm_bindgen_futures::spawn_local(async {
+            if let Some(data) = promise.await.ok() {
+                *sbuffer.borrow_mut() = Some(web_sys::AudioBuffer::from(data));
+            }
+            ()
+        });
+        ret
+    }
+
+    pub fn play(&self, ctx: &Context, looping: Option<(Option<f64>, Option<f64>)>) -> Option<web_sys::AudioBufferSourceNode> {
+        let source = ctx.audio.create_buffer_source().ok()?;
+        source.set_buffer((&*self.buffer.borrow()).as_ref());
+        if let Some((ms, me)) = looping {
+            source.set_loop(true);
+            if let Some(s) = ms { source.set_loop_start(s) }
+            if let Some(e) = me { source.set_loop_end(e) }
+        }
+        source.connect_with_audio_node(&ctx.audio.destination()).ok()?;
+        source.start().ok()?;
+        Some(source)
+    }
+}
+
+pub struct Assets {
+    pub ctx: Context,
+
+    pub audio: HashMap<String, Audio>,
+
+    pub music_node: Option<web_sys::AudioBufferSourceNode>, 
+}
+
+impl Assets {
+    pub fn new<F>(f : F) -> Self where F: Fn(&Context) -> HashMap<String, Audio> {
+        let ctx = Context::new();
+
+        let audio = f(&ctx);
+
+        Self {
+            ctx,
+            audio,
+            music_node: None,
+        }
+    }
+
+    pub fn play_sfx(&mut self, name: &str) {
+        if let Some(a) = self.audio.get(name) {
+            a.play(&self.ctx, None);
+        }
+    }
+
+    pub fn is_music_playing(&self) -> bool {
+        if let Some(ms) = &self.music_node {
+            ms.buffer().is_some()
+        } else { false }
+    }
+
+    pub fn play_music(&mut self, name: &str, start: Option<f64>, end: Option<f64>) {
+        if let Some(s) = &self.music_node {
+            let _ = s.stop();
+        }
+        if let Some(a) = self.audio.get(name) {
+            self.music_node = a.play(&self.ctx, Some((start, end)));
+        }
+    }
+}