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switch to sending render world back and forth with channels
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| use async_channel::{Receiver, Sender}; | ||
| use bevy_app::{App, SubApp}; | ||
| use bevy_ecs::{schedule::MainThreadExecutor, system::Resource, world::Mut}; | ||
| use bevy_tasks::ComputeTaskPool; | ||
|
|
||
| #[cfg(feature = "trace")] | ||
| use bevy_utils::tracing::Instrument; | ||
|
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| use crate::RenderApp; | ||
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| /// Resource to be used for pipelined rendering for sending the render app from the main thread to the rendering thread | ||
| #[derive(Resource)] | ||
| pub struct MainToRenderAppSender(pub Sender<SubApp>); | ||
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| /// Resource used by pipelined rendering to send the render app from the render thread to the main thread | ||
| #[derive(Resource)] | ||
| pub struct RenderToMainAppReceiver(pub Receiver<SubApp>); | ||
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| /// sets up the render thread and insert resource into the main app for controlling the render thread | ||
| pub fn setup_pipelined_rendering(app: &mut App) { | ||
| let (app_to_render_sender, app_to_render_receiver) = async_channel::bounded::<SubApp>(1); | ||
| let (render_to_app_sender, render_to_app_receiver) = async_channel::bounded::<SubApp>(1); | ||
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| let render_app = app.remove_sub_app(RenderApp).unwrap(); | ||
| render_to_app_sender.send_blocking(render_app).unwrap(); | ||
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| app.insert_resource(MainToRenderAppSender(app_to_render_sender)); | ||
| app.insert_resource(RenderToMainAppReceiver(render_to_app_receiver)); | ||
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| let render_task = async move { | ||
| loop { | ||
| // TODO: exit loop when app is exited | ||
| let recv_task = app_to_render_receiver.recv(); | ||
| #[cfg(feature = "trace")] | ||
| let span = bevy_utils::tracing::info_span!("receive render world from main"); | ||
| #[cfg(feature = "trace")] | ||
| let recv_task = recv_task.instrument(span); | ||
| let mut sub_app = recv_task.await.unwrap(); | ||
| sub_app.run(); | ||
| render_to_app_sender.send(sub_app).await.unwrap(); | ||
| } | ||
| }; | ||
| #[cfg(feature = "trace")] | ||
| let span = bevy_utils::tracing::info_span!("render task"); | ||
| #[cfg(feature = "trace")] | ||
| let render_task = render_task.instrument(span); | ||
| ComputeTaskPool::get().spawn(render_task).detach(); | ||
| } | ||
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| pub fn update_rendering(app: &mut App) { | ||
| app.update(); | ||
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| // wait to get the render app back to signal that rendering is finished | ||
| let mut render_app = app | ||
| .world | ||
| .resource_scope(|world, main_thread_executor: Mut<MainThreadExecutor>| { | ||
| ComputeTaskPool::get() | ||
| .scope(Some(main_thread_executor.0.clone()), |s| { | ||
| s.spawn(async { | ||
| let receiver = world.get_resource::<RenderToMainAppReceiver>().unwrap(); | ||
| let recv = receiver.0.recv(); | ||
| #[cfg(feature = "trace")] | ||
| let span = bevy_utils::tracing::info_span!("wait for render"); | ||
| #[cfg(feature = "trace")] | ||
| let recv = recv.instrument(span); | ||
| recv.await.unwrap() | ||
| }); | ||
| }) | ||
| .pop() | ||
| }) | ||
| .unwrap(); | ||
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| render_app.extract(&mut app.world); | ||
|
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| { | ||
| #[cfg(feature = "trace")] | ||
| let _span = bevy_utils::tracing::info_span!("send world to render").entered(); | ||
| app.world | ||
| .resource_scope(|_world, sender: Mut<MainToRenderAppSender>| { | ||
| sender.0.send_blocking(render_app).unwrap(); | ||
| }); | ||
| } | ||
|
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| // frame pacing plugin should run here somehow. i.e. after rendering, but before input handling | ||
| } |
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