[rs] Small comment on WebGPU backend bit, readme update

wgpu/README.md

@@ -8,7 +8,7 @@
 
 wgpu-rs is an idiomatic Rust wrapper over [wgpu-core](https://github.com/gfx-rs/wgpu). It's designed to be suitable for general purpose graphics and computation needs of Rust community.
 
-Currently wgpu-rs works on native platforms, but [WASM support is currently being added](https://github.com/gfx-rs/wgpu-rs/issues/101) as well.
+wgpu-rs can target both the natively supported backends and WASM directly.
 
 ## Gallery
 

wgpu/src/backend/web.rs

@@ -634,6 +634,9 @@ impl crate::Context for Context {
         options: &crate::RequestAdapterOptions<'_>,
         _backends: wgt::BackendBit,
     ) -> Self::RequestAdapterFuture {
+        //TODO: support this check, return `None` if the flag is not set.
+        // It's not trivial, since we need the Future logic to have this check,
+        // and currently the Future her has no room for extra parameter `backends`.
         //assert!(backends.contains(wgt::BackendBit::BROWSER_WEBGPU));
         let mut mapped_options = web_sys::GpuRequestAdapterOptions::new();
         let mapped_power_preference = match options.power_preference {