panics when running Hello World under WSL Debian with VcXsrv

[amberisvibin]

I have WSL Debian running with an x server. Most x applications work fine. When I try to run the hello world, with backtrace on, I get an error that seems to be related to webgpu. The webgpu should not be used in this context. Is there a way to tell iced not use the wepgpu? I looked around but could not find it. Thank you.

cargo run
warning: Error finalizing incremental compilation session directory `/home/amber/projects/openscan/target/debug/incremental/openscan-2zoz56y28rfvu/s-fswkhvt0e8-g6htin-working`: Permission denied (os error 13)

warning: 1 warning emitted

    Finished dev [unoptimized + debuginfo] target(s) in 0.64s
     Running `target/debug/openscan`
thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', /home/amber/.cargo/registry/src/github.com-1ecc6299db9ec823/wgpu-native-0.4.3/src/instance.rs:474:72
stack backtrace:
   0: rust_begin_unwind
             at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/panicking.rs:475
   1: core::panicking::panic_fmt
             at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/core/src/panicking.rs:85
   2: core::panicking::panic
             at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/core/src/panicking.rs:50
   3: core::option::Option<T>::unwrap
             at /home/amber/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/option.rs:370
   4: wgpu_request_adapter
             at /home/amber/.cargo/registry/src/github.com-1ecc6299db9ec823/wgpu-native-0.4.3/src/instance.rs:474
   5: wgpu::Adapter::request
             at /home/amber/.cargo/registry/src/github.com-1ecc6299db9ec823/wgpu-0.4.0/src/lib.rs:545
   6: <iced_wgpu::window::backend::Backend as iced_native::window::backend::Backend>::new
             at /home/amber/.cargo/registry/src/github.com-1ecc6299db9ec823/iced_wgpu-0.2.3/src/window/backend.rs:21
   7: iced_winit::application::Application::run
             at /home/amber/.cargo/registry/src/github.com-1ecc6299db9ec823/iced_winit-0.1.0/src/application.rs:180
   8: iced::application::Application::run
             at /home/amber/.cargo/registry/src/github.com-1ecc6299db9ec823/iced-0.1.1/src/application.rs:201
   9: openscan::main
             at ./src/main.rs:4
  10: core::ops::function::FnOnce::call_once
             at /home/amber/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ops/function.rs:227
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

[FabianLars]

Afaik vulkan doesn't work on wsl and therefore wgpu doesn't work either (wgpu is still missing opengl support). I switched to the glow (opengl) backend/feature to work around that and so far it's running nicely in wsl.

[amberisvibin]

That just gives me this error, but I could be doing this wrong. the package `openscan` depends on `iced`, with features: `glow` but `iced` does not have these features.

[FabianLars]

Oh, I think the current crates.io version is too old for that, not sure tho because I'm using the git version. Is using the git version an option for the moment?

[amberisvibin]

No, let me try that.

[amberisvibin]

That fixed it, thank you! TLDR: glow (opengl backend) is required for WSL, because vulkan is unsupported.