Added placeholder wasi-webgpu backend

wgpu/Cargo.toml

@@ -47,6 +47,9 @@ vulkan-portability = ["wgc?/vulkan"]
 ## Enables the WebGPU backend on Wasm. Disabled when targeting `emscripten`.
 webgpu = ["naga?/wgsl-out"]
 
+## Enables the WASI-WebGPU backend.
+wasi-webgpu = []
+
 ## Enables the GLES backend on Wasm
 ##
 ## * ⚠️ WIP: Currently will also enable GLES dependencies on any other targets.
@@ -167,6 +170,8 @@ raw-window-handle = { workspace = true, features = ["std"] }
 serde = { workspace = true, features = ["derive"], optional = true }
 smallvec.workspace = true
 static_assertions.workspace = true
+# TODO: only for wasi-webgpu
+wit-bindgen = "0.19.0"
 
 [dependencies.naga]
 workspace = true

wgpu/build.rs

@@ -3,6 +3,7 @@ fn main() {
         native: { not(target_arch = "wasm32") },
         webgl: { all(target_arch = "wasm32", not(target_os = "emscripten"), feature = "webgl") },
         webgpu: { all(target_arch = "wasm32", not(target_os = "emscripten"), feature = "webgpu") },
+        wasi_webgpu: { all(target_arch = "wasm32", not(target_os = "emscripten"), feature = "wasi_webgpu") },
         Emscripten: { all(target_arch = "wasm32", target_os = "emscripten") },
         wgpu_core: { any(native, webgl, emscripten) },
         send_sync: { any(

wgpu/src/backend/mod.rs

@@ -7,3 +7,8 @@ pub(crate) use webgpu::{get_browser_gpu_property, ContextWebGpu};
 mod wgpu_core;
 #[cfg(wgpu_core)]
 pub(crate) use wgpu_core::ContextWgpuCore;
+
+#[cfg(wasi_webgpu)]
+mod wasi_webgpu;
+#[cfg(wasi_webgpu)]
+pub(crate) use wasi_webgpu::ContextWasiWebgpu;