Fix compatibility with Embedded Swift

Author: MaxDesiatov

WebGPUDemo/Sources/Entrypoint.swift

@@ -10,17 +10,19 @@
 //
 //===----------------------------------------------------------------------===//
 
+import _Concurrency
 import DOM
 import JavaScriptEventLoop
 import JavaScriptKit
+import WebAPIBase
 import WebGPU
 
-func fetchString(url: String) async throws -> String {
+func fetchString(url: String) async throws(JSException) -> String {
   let result = try await Window.global.fetch(input: .init(url))
   return try await result.text()
 }
 
-func fetchImageBitmap(url: String) async throws -> ImageBitmap {
+func fetchImageBitmap(url: String) async throws(JSException) -> ImageBitmap {
   let blob = try await Window.global.fetch(input: .init(url)).blob()
   return try await Window.global.createImageBitmap(
     image: .blob(blob),
@@ -34,22 +36,26 @@ struct Entrypoint {
     JavaScriptEventLoop.installGlobalExecutor()
     let gpu = Window.global.navigator.gpu
     Task {
-      let adapter = try await gpu.requestAdapter()!
-      let device = try await adapter.requestDevice()
+      do throws(JSException) {
+        let adapter = try await gpu.requestAdapter()!
+        let device = try await adapter.requestDevice()
 
-      let renderer = try await Renderer(
-        device: device,
-        gpu: gpu,
-        assets: .init(
-          shaders: fetchString(url: "Resources/shaders.wgsl"),
-          model: fetchString(url: "Resources/SwiftLogo/Swift3DLogo.obj"),
-          albedo: fetchImageBitmap(url: "Resources/SwiftLogo/T_M_swiftLogo_BaseColor.png"),
-          normal: fetchImageBitmap(url: "Resources/SwiftLogo/T_M_swiftLogo_Normal.png"),
-          metalRoughness: fetchImageBitmap(url: "Resources/SwiftLogo/T_M_swiftLogo_MetalRoughness.png"),
-        ),
-      )
+        let renderer = try await Renderer(
+          device: device,
+          gpu: gpu,
+          assets: .init(
+            shaders: fetchString(url: "Resources/shaders.wgsl"),
+            model: fetchString(url: "Resources/SwiftLogo/Swift3DLogo.obj"),
+            albedo: fetchImageBitmap(url: "Resources/SwiftLogo/T_M_swiftLogo_BaseColor.png"),
+            normal: fetchImageBitmap(url: "Resources/SwiftLogo/T_M_swiftLogo_Normal.png"),
+            metalRoughness: fetchImageBitmap(url: "Resources/SwiftLogo/T_M_swiftLogo_MetalRoughness.png"),
+          ),
+        )
 
-      draw(renderer: renderer)
+        draw(renderer: renderer)
+      } catch {
+        console.error(data: error.thrownValue)
+      }
     }
   }
 }