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use crate::uses::{sync::*, *};
use GL::{window::*, Fence};
pub struct Offhand<O> {
handle: Option<JoinHandle<Res<()>>>,
rx: Receiver<(O, Fence)>,
}
impl<O: 'static + Send> Offhand<O> {
pub fn new<I: 'static + Send>(window: &mut Window, depth: usize, process: impl 'static + Send + Fn(I) -> O) -> (Sender<I>, Self) {
let (data_sn, data_rx): (Sender<I>, Receiver<I>) = chan::bounded(depth);
let (res_sn, res_rx): (Sender<(O, Fence)>, Receiver<(O, Fence)>) = chan::bounded(depth);
let handle = window.spawn_offhand_gl(move || {
while let Ok(msg) = data_rx.recv() {
let res = process(msg);
let _ = res_sn.send((res, Fence::new())).map_err(|e| FAIL!(e));
}
});
let (handle, rx) = (Some(handle), res_rx);
(data_sn, Self { handle, rx })
}
pub fn recv(&self) -> OffhandRes<O> {
self.rx.recv().ok().map_or(OffhandRes(None), |r| OffhandRes(Some(r)))
}
pub fn try_recv(&self) -> Option<OffhandRes<O>> {
self.rx.try_recv().ok().map(|r| OffhandRes(Some(r)))
}
}
impl<O> Drop for Offhand<O> {
fn drop(&mut self) {
self.handle.take().unwrap().join().unwrap().unwrap();
}
}
pub struct OffhandRes<O>(Option<(O, Fence)>);
impl<O> OffhandRes<O> {
pub fn wait(self) -> Option<O> {
self.0.map(|(r, f)| {
f.Block();
r
})
}
}