getting "the trait Sync is not implemented for `(dyn wgpu::context::DynContext + 'static)"

[Umenokin]

I am trying to use wgpu with the shipyard.
I created Unique component which right now only has wgpu surface, device, and queue:

#[derive(Unique)]
pub struct Render {
    pub(crate) surface: wgpu::Surface,
    pub(crate) device: wgpu::Device,
    pub(crate) queue: wgpu::Queue,
}

...

app.world.add_unique(Render {
        surface,
        device,
        queue
 });

As a result, I am getting an error:

`(dyn wgpu::context::DynContext + 'static)` cannot be shared between threads safely
the trait `Sync` is not implemented for `(dyn wgpu::context::DynContext + 'static)`
required for `Arc<(dyn wgpu::context::DynContext + 'static)>` to implement `Send`

The cause of the error is having any of those three in my Render struct - surface, device, queue. But when I check the wgpu source code, I can see:

static_assertions::assert_impl_all!(Instance: Send, Sync);
static_assertions::assert_impl_all!(Device: Send, Sync);
static_assertions::assert_impl_all!(Queue: Send, Sync);

which I assume should mean that those are indeed has to be Send and Sync. More to that, it seems shipyard has the demo that doing exactly the same but does not suffer from that issue:

world.add_unique(Graphics {
        surface,
        device,
        queue,
        config,
        size,
        render_pipeline,
        vertex_buffer,
        vertex_count: 0,
        instance_buffer,
        scale_factor: window.scale_factor() as f32,
        screen_size_buffer,
        screen_size_bind_group,
        bunny_diffuse_bind_group,
        context,
        input: egui::RawInput::default(),
        egui_render_pass,
 });

Thanks! 🙏

[cwfitzgerald]

Are you running on the web? Wgpu types are only send and sync on native, on web they are !Send !Sync

[Umenokin]

Thank you @cwfitzgerald I thought it was likely the case but I could see any shipyard features in their demo working. But now I know I need to ask in shipyard's forum. Thanks!

[cwfitzgerald]

Send/Sync was only removed in 0.17 I think, so if they're still on 0.16,that could explain it

[Umenokin]

Thank you, @cwfitzgerald. You were right. It was a confusing combination of factors - shipyard using WGPU 0.15 and requires dedicated thread_local feature and different method used for !Sync WGPU which was not visible without this feature.

Thanks again!