Assert with connect_graphics_context from rectangle_simple_buffer

[yowl]

I'm trying to do a frame buffer example copying from the rectangle example in the repo but it seems that the bundled example asserts. Is it known to be working?

C:\github\wasi-gfx-runtime>cargo xtask run-demo --name rectangle_simple_buffer
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.04s
     Running `xtask\target\debug\xtask.exe run-demo --name rectangle_simple_buffer`
   Compiling rectangle_simple_buffer v0.1.0 (C:\github\wasi-gfx-runtime\examples\apps\rectangle_frame_buffer)
    Finished `release` profile [optimized] target(s) in 3.91s
   Compiling runtime v0.1.0 (C:\github\wasi-gfx-runtime\examples\runtime)
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 15.70s
     Running `target\debug\runtime.exe --example rectangle_simple_buffer`
thread 'tokio-runtime-worker' panicked at crates\wasi-frame-buffer-wasmtime\src\lib.rs:90:82:
called `Result::unwrap()` on an `Err` value: Unavailable
stack backtrace:
   0:     0x7ff60322bafa - std::backtrace_rs::backtrace::dbghelp64::trace
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library\std\src\..\..\backtrace\src\backtrace\dbghelp64.rs:99
   1:     0x7ff60322bafa - std::backtrace_rs::backtrace::trace_unsynchronized
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library\std\src\..\..\backtrace\src\backtrace\mod.rs:66
   2:     0x7ff60322bafa - std::sys_common::backtrace::_print_fmt
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library\std\src\sys_common\backtrace.rs:68
   3:     0x7ff60322bafa - std::sys_common::backtrace::_print::impl$0::fmt
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library\std\src\sys_common\backtrace.rs:44
   4:     0x7ff60324686b - core::fmt::rt::Argument::fmt
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library\core\src\fmt\rt.rs:142
   5:     0x7ff60324686b - core::fmt::write
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library\core\src\fmt\mod.rs:1153
   6:     0x7ff603227601 - std::io::Write::write_fmt<std::sys::pal::windows::stdio::Stderr>
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library\std\src\io\mod.rs:1843
   7:     0x7ff60322b8e6 - std::sys_common::backtrace::print
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library\std\src\sys_common\backtrace.rs:34
   8:     0x7ff60322da8f - std::panicking::default_hook::closure$1
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library\std\src\panicking.rs:272
   9:     0x7ff60322d727 - std::panicking::default_hook
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library\std\src\panicking.rs:292
  10:     0x7ff60322dfcd - std::panicking::rust_panic_with_hook
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library\std\src\panicking.rs:779
  11:     0x7ff60322de89 - std::panicking::begin_panic_handler::closure$0
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library\std\src\panicking.rs:657
  12:     0x7ff60322c189 - std::sys_common::backtrace::__rust_end_short_backtrace<std::panicking::begin_panic_handler::closure_env$0,never$>
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library\std\src\sys_common\backtrace.rs:171
  13:     0x7ff60322db46 - std::panicking::begin_panic_handler
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library\std\src\panicking.rs:645
  14:     0x7ff6032bd357 - core::panicking::panic_fmt
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library\core\src\panicking.rs:72
  15:     0x7ff6032bd953 - core::result::unwrap_failed
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library\core\src\result.rs:1654
  16:     0x7ff601dd207e - enum2$<core::result::Result<raw_window_handle::borrowed::WindowHandle,raw_window_handle::HandleError> >::unwrap
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6\library\core\src\result.rs:1077
  17:     0x7ff601dd207e - wasi_frame_buffer_wasmtime::impl$5::display_api_ready
                               at C:\github\wasi-gfx-runtime\crates\wasi-frame-buffer-wasmtime\src\lib.rs:90
  18:     0x7ff601dd1b39 - wasi_frame_buffer_wasmtime::impl$4::display_api_ready
                               at C:\github\wasi-gfx-runtime\crates\wasi-frame-buffer-wasmtime\src\lib.rs:54
  19:     0x7ff601ddafd4 - wasi_graphics_context_wasmtime::GraphicsContext::connect_draw_api
                               at C:\github\wasi-gfx-runtime\crates\wasi-graphics-context-wasmtime\src\lib.rs:51
  20:     0x7ff601dd2603 - wasi_frame_buffer_wasmtime::impl$10::connect_graphics_context
                               at C:\github\wasi-gfx-runtime\crates\wasi-frame-buffer-wasmtime\src\lib.rs:158
  21:     0x7ff60132ba1e - wasi_frame_buffer_wasmtime::wasi::webgpu::frame_buffer::impl$1::connect_graphics_context<dyn$<wasi_frame_buffer_wasmtime::WasiFrameBufferView> >
                               at C:\github\wasi-gfx-runtime\crates\wasi-frame-buffer-wasmtime\src\lib.rs:12
  22:     0x7ff60114937c - wasi_frame_buffer_wasmtime::wasi::webgpu::frame_buffer::add_to_linker_get_host::closure$3<runtime::HostState,wasi_frame_buffer_wasmtime::add_to_linker::closure_env$0<runtime::HostState> >
                               at C:\github\wasi-gfx-runtime\crates\wasi-frame-buffer-wasmtime\src\lib.rs:12
  23:     0x7ff600fb8d71 - wasmtime::runtime::component::func::host::impl$0::entrypoint::closure$0::closure$0<runtime::HostState,wasi_frame_buffer_wasmtime::wasi::webgpu::frame_buffer::add_to_linker_get_host::closure_env$3<runtime::HostState,wasi_frame_buffer_wasmtime::add_to_linke
                               at C:\Users\scott\.cargo\registry\src\index.crates.io-6f17d22bba15001f\wasmtime-21.0.1\src\runtime\component\func\host.rs:68
  24:     0x7ff600ff9a06 - wasmtime::runtime::component::func::host::call_host<runtime::HostState,tuple$<wasmtime::runtime::component::resources::Resource<wasi_frame_buffer_wasmtime::FBSurfaceArc>,wasmtime::runtime::component::resources::Resource<wasi_graphics_context_wasmtime::Gra
                               at C:\Users\scott\.cargo\registry\src\index.crates.io-6f17d22bba15001f\wasmtime-21.0.1\src\runtime\component\func\host.rs:216
  25:     0x7ff600fb5144 - wasmtime::runtime::component::func::host::impl$0::entrypoint::closure$0<runtime::HostState,wasi_frame_buffer_wasmtime::wasi::webgpu::frame_buffer::add_to_linker_get_host::closure_env$3<runtime::HostState,wasi_frame_buffer_wasmtime::add_to_linker::closure_
                               at C:\Users\scott\.cargo\registry\src\index.crates.io-6f17d22bba15001f\wasmtime-21.0.1\src\runtime\component\func\host.rs:60
  26:     0x7ff601403641 - core::panic::unwind_safe::impl$25::call_once<enum2$<core::result::Result<tuple$<>,anyhow::Error> >,wasmtime::runtime::component::func::host::impl$0::entrypoint::closure_env$0<runtime::HostState,wasi_frame_buffer_wasmtime::wasi::webgpu::frame_buffer::add_t
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6\library\core\src\panic\unwind_safe.rs:272
  27:     0x7ff60149e429 - std::panicking::try::do_call<core::panic::unwind_safe::AssertUnwindSafe<wasmtime::runtime::component::func::host::impl$0::entrypoint::closure_env$0<runtime::HostState,wasi_frame_buffer_wasmtime::wasi::webgpu::frame_buffer::add_to_linker_get_host::closure_
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6\library\std\src\panicking.rs:552
  28:     0x7ff6014b4333 - std::panicking::try::do_catch<core::panic::unwind_safe::AssertUnwindSafe<wasmtime::runtime::component::func::host::impl$0::entrypoint::closure_env$0<runtime::HostState,wasi_webgpu_wasmtime::wasi::webgpu::webgpu::add_to_linker_get_host::closure_env$203<run
  29:     0x7ff60148e3bb - std::panicking::try<enum2$<core::result::Result<tuple$<>,anyhow::Error> >,core::panic::unwind_safe::AssertUnwindSafe<wasmtime::runtime::component::func::host::impl$0::entrypoint::closure_env$0<runtime::HostState,wasi_frame_buffer_wasmtime::wasi::webgpu::f
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6\library\std\src\panicking.rs:516
  30:     0x7ff6013271c1 - std::panic::catch_unwind<core::panic::unwind_safe::AssertUnwindSafe<wasmtime::runtime::component::func::host::impl$0::entrypoint::closure_env$0<runtime::HostState,wasi_frame_buffer_wasmtime::wasi::webgpu::frame_buffer::add_to_linker_get_host::closure_env$
                               at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6\library\std\src\panic.rs:146
  31:     0x7ff6014c4dd9 - wasmtime::runtime::vm::traphandlers::catch_unwind_and_longjmp<enum2$<core::result::Result<tuple$<>,anyhow::Error> >,wasmtime::runtime::component::func::host::impl$0::entrypoint::closure_env$0<runtime::HostState,wasi_frame_buffer_wasmtime::wasi::webgpu::fr
                               at C:\Users\scott\.cargo\registry\src\index.crates.io-6f17d22bba15001f\wasmtime-21.0.1\src\runtime\vm\traphandlers.rs:123
  32:     0x7ff600f6cc69 - wasmtime::runtime::component::func::host::handle_result<wasmtime::runtime::component::func::host::impl$0::entrypoint::closure_env$0<runtime::HostState,wasi_frame_buffer_wasmtime::wasi::webgpu::frame_buffer::add_to_linker_get_host::closure_env$3<runtime::H
                               at C:\Users\scott\.cargo\registry\src\index.crates.io-6f17d22bba15001f\wasmtime-21.0.1\src\runtime\component\func\host.rs:294
  33:     0x7ff600f97503 - wasmtime::runtime::component::func::host::HostFunc::entrypoint<runtime::HostState,wasi_frame_buffer_wasmtime::wasi::webgpu::frame_buffer::add_to_linker_get_host::closure_env$3<runtime::HostState,wasi_frame_buffer_wasmtime::add_to_linker::closure_env$0<run
                               at C:\Users\scott\.cargo\registry\src\index.crates.io-6f17d22bba15001f\wasmtime-21.0.1\src\runtime\component\func\host.rs:59
  34:      0x247c420cb21 - <unknown>
  35:      0x247c41f14bc - <unknown>
  36:      0x247c4205c11 - <unknown>

[yowl]

Looks like the window handle in not available yet, but what should I do to wait for that to be available, is there a pollable?

[yowl]

I did try waiting for a resize event, but there is still no window_handle , perhaps because I'm on windows...?

[yowl]

update after adding lots of println, WasiWinitEventLoopProxy, create_window, I'm no expert here, but the oneshot::channel / receiver seems to loose the window_handle in the receiver.await. In user_event the handle exists on the MiniCanvas just before response_channel.send but on the receiver side it is Err(Unavailable). Just noting my observations in case this rings any bells, but will contiue to dig a bit more, although oneshot is not part of this repo.

[yowl]

Window on WIndows has some thread affinity restrictions, https://docs.rs/winit/latest/winit/platform/windows/trait.WindowExtWindows.html#tymethod.window_handle_any_thread

Seems like my problem, exactly what we can't do on a different thread is not yet clear, but the handle by default is Unavailable unless window_handle_any_thread is used.

[yowl]

I think softbuffer may be the next problem, I wonder if WasiWinitEventLoop could have an option to be single threaded?