Test WebGPU backend with extra features

.github/workflows/ci.yml

@@ -156,10 +156,14 @@ jobs:
       - name: check web
         if: matrix.kind == 'web'
         run: |
-          cargo ${{matrix.tool}} --target ${{ matrix.target }} -p wgpu
+          # build examples
+          cargo ${{matrix.tool}} --target ${{ matrix.target }} -p wgpu --examples
 
-          # Build for WebGL
-          cargo ${{matrix.tool}} --target ${{ matrix.target }} -p wgpu --features webgl -- -D warnings
+          # build with features
+          cargo ${{matrix.tool}} --target ${{ matrix.target }} -p wgpu --features glsl,spirv
+
+          # build for WebGL
+          cargo ${{matrix.tool}} --target ${{ matrix.target }} -p wgpu --features webgl
 
           # build docs
           cargo doc --target ${{ matrix.target }} -p wgpu --no-deps

wgpu-hal/Cargo.toml

@@ -85,6 +85,8 @@ git = "https://github.com/gfx-rs/naga"
 rev = "09d35f3"
 #version = "0.8"
 
+# DEV dependencies
+
 [dev-dependencies.naga]
 git = "https://github.com/gfx-rs/naga"
 rev = "09d35f3"
@@ -94,4 +96,6 @@ features = ["wgsl-in"]
 [dev-dependencies]
 env_logger = "0.8"
 winit = "0.26" # for "halmark" example
+
+[target.'cfg(not(target_arch = "wasm32"))'.dev-dependencies]
 glutin = "0.28" # for "gles" example

wgpu-hal/examples/raw-gles.rs

@@ -2,9 +2,14 @@
 //! the ability to hook up wgpu-hal to an existing context and draw into it.
 
 extern crate wgpu_hal as hal;
-use hal::{Adapter as _, CommandEncoder as _, Device as _, Queue as _};
 
+#[cfg(target_arch = "wasm32")]
+fn main() {}
+
+#[cfg(not(target_arch = "wasm32"))]
 fn main() {
+    use hal::{Adapter as _, CommandEncoder as _, Device as _, Queue as _};
+
     env_logger::init();
     println!("Initializing external GL context");
 

wgpu-info/src/main.rs

@@ -104,9 +104,12 @@ fn print_info_from_adapter(adapter: &wgpu::Adapter, idx: usize) {
     }
 }
 
+#[cfg(target_arch = "wasm32")]
+fn main() {}
+
+#[cfg(not(target_arch = "wasm32"))]
 fn main() {
     env_logger::init();
-
     let args: Vec<_> = std::env::args().skip(1).collect();
 
     let instance = wgpu::Instance::new(wgpu::Backends::all());

wgpu/examples/hello-windows/main.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(target_arch = "wasm32", allow(dead_code))]
+
 use std::collections::HashMap;
 use winit::{
     event::{Event, WindowEvent},