WebGPU build broken

[emilk]

./scripts/build_demo_web.sh --webgpu --release
./scripts/start_server.sh

panicked at 'canvas context is not a GPUCanvasContext: Object { obj: JsValue(GPUCanvasContext) }', /Users/emilk/.cargo/registry/src/index.crates.io-6f17d22bba15001f/wgpu-0.18.0/src/backend/web.rs:975:14

[Wumpf]

struggling with this one. It seems to fail a cast that should just work. Suspected some kind of web_sys/wasm-bindgen version issue but updating those didn't help so far. Hoping for responses on wgpu matrix chat right now

[Wumpf]

Meanwhile, re_renderer's examples work fine on webgpu using the exact same wgpu, bindgen, web_sys, js_sys versions 😕

[emilk]

According to @Wumpf the wgpu web build works again with this wgpu pr), so this will likely solve itself when we update wgpu

[rakurtz]

Hey emilk, i am not sure if the error message i get when i try to compile the eframe template with wgpu instead of glow is related to the above described issue:

error: failed to select a version for `web-sys`.
    ... required by package `wgpu v0.18.0`
    ... which satisfies dependency `wgpu = "^0.18.0"` of package `eframe v0.25.0`
    ... which satisfies dependency `eframe = "^0.25.0"` (locked to 0.25.0) of package `msg-extractor v0.1.0 (/Users/xxxxxx/VisualStudioCodeProjects/Rust/HELPER/msg-extractor)`
versions that meet the requirements `^0.3.64` (locked to 0.3.67) are: 0.3.67

the package `wgpu` depends on `web-sys`, with features: `GpuComputePassTimestampWrite` but `web-sys` does not have these features.

Maybe that helps ?

[emilk]

no, that's a compilation issue. Looks like you're using an old web-sys

[emilk]

A fix is coming in #3824

[rakurtz]

no, that's a compilation issue. Looks like you're using an old web-sys

mmh, i am using the current version of web-sys 0.3.67. I just took the eframe-template and switched to wgpu in Cargo.toml though. Shall i file another issue dedicated to the above error messages?

[emilk]

@rakurtz you are using a newer web-sys with an older wgpu. If you switch to wgpu trunk, or downgrade web-sys, it will work.

see gfx-rs/wgpu#4777