Seemed to make an attempt at running but no valid adapter found on laptop

src/main.c

@@ -3,48 +3,35 @@
 #include <stdio.h>
 #include <webgpu/webgpu.h>
 
-WGPUAdapter requestAdapterSync(WGPUInstance instance,
-                               WGPURequestAdapterOptions const *options) {
-  typedef struct {
-    WGPUAdapter adapter;
-    bool requestEnded;
-  } UserData;
-
-  UserData userData = {.adapter = NULL, .requestEnded = false};
-
-  // Callback called by wgpuInstanceRequestAdapter when the request returns
-  // This is a C++ lambda function, but could be any function defined in the
-  // global scope. It must be non-capturing (the brackets [] are empty) so
-  // that it behaves like a regular C function pointer, which is what
-  // wgpuInstanceRequestAdapter expects (WebGPU being a C API). The workaround
-  // is to convey what we want to capture through the pUserData pointer,
-  // provided as the last argument of wgpuInstanceRequestAdapter and received
-  // by the callback as its last argument.
-  auto onAdapterRequestEnded = [](WGPURequestAdapterStatus status,
-                                  WGPUAdapter adapter, char const *message,
-                                  void *pUserData) {
-    UserData &userData = *reinterpret_cast<UserData *>(pUserData);
-    if (status == WGPURequestAdapterStatus_Success) {
-      userData.adapter = adapter;
-    } else {
-      std::cout << "Could not get WebGPU adapter: " << message << std::endl;
-    }
-    userData.requestEnded = true;
-  };
-
-  // Call to the WebGPU request adapter procedure
-  wgpuInstanceRequestAdapter(instance /* equivalent of navigator.gpu */,
-                             options, onAdapterRequestEnded, (void *)&userData);
-
-  // We wait until userData.requestEnded gets true
-  {
-    {Wait for request to end
-    }
+static void OnRequestAdapter(WGPURequestAdapterStatus status,
+                             WGPUAdapter adapter, WGPUStringView message,
+                             void *userdata1, void *userdata2) {
+  // TODO handle messages and errors better
+  if (status != WGPURequestAdapterStatus_Success) {
+    printf("%s", message.data);
   }
+  assert(status == WGPURequestAdapterStatus_Success);
 
-  assert(userData.requestEnded);
+  WGPUAdapter *result = userdata1;
+  if (*result == NULL) {
+    *result = adapter;
+  }
+}
 
-  return userData.adapter;
+void requestAdapterSync(WGPUInstance instance,
+                        WGPURequestAdapterOptions const *options,
+                        WGPUAdapter *adapter) {
+
+  WGPURequestAdapterCallbackInfo info = {.mode = WGPUCallbackMode_WaitAnyOnly,
+                                         .callback = &OnRequestAdapter,
+                                         .userdata1 = adapter};
+  WGPUFuture future = wgpuInstanceRequestAdapter(instance, options, info);
+  WGPUFutureWaitInfo wait = {
+      .future = future,
+  };
+  WGPUWaitStatus status = wgpuInstanceWaitAny(instance, 1, &wait, 0);
+  assert(status == WGPUWaitStatus_Success);
+  assert(adapter);
 }
 
 int main() {
@@ -65,6 +52,14 @@ int main() {
   // copied around without worrying about its size).
   printf("WGPU instance: %p\n", instance);
 
+  printf("Requesting Adapter.\n");
+  WGPUAdapter adapter = NULL;
+  WGPURequestAdapterOptions adapterOpts = {0};
+  requestAdapterSync(instance, &adapterOpts, &adapter);
+  printf("Got Adapter: %p\n", &adapter);
+
+  // Cleanup
+  wgpuAdapterRelease(adapter);
   wgpuInstanceRelease(instance);
   return 0;
 }