1 files changed, 81 insertions, 0 deletions
diff --git a/dom/webgpu/Instance.cpp b/dom/webgpu/Instance.cpp
new file mode 100644
index 0000000000..9eb53b136d
--- /dev/null
+++ b/dom/webgpu/Instance.cpp
@@ -0,0 +1,81 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "Instance.h"
+
+#include "Adapter.h"
+#include "gfxConfig.h"
+#include "nsIGlobalObject.h"
+#include "ipc/WebGPUChild.h"
+#include "ipc/WebGPUTypes.h"
+#include "mozilla/dom/Promise.h"
+#include "mozilla/layers/CompositorBridgeChild.h"
+
+namespace mozilla {
+namespace webgpu {
+
+GPU_IMPL_CYCLE_COLLECTION(Instance, mBridge, mOwner)
+
+/*static*/
+already_AddRefed<Instance> Instance::Create(nsIGlobalObject* aOwner) {
+  RefPtr<WebGPUChild> bridge;
+
+  if (gfx::gfxConfig::IsEnabled(gfx::Feature::WEBGPU)) {
+    bridge = layers::CompositorBridgeChild::Get()->GetWebGPUChild();
+    if (NS_WARN_IF(!bridge)) {
+      MOZ_CRASH("Failed to create an IPDL bridge for WebGPU!");
+    }
+  }
+
+  RefPtr<Instance> result = new Instance(aOwner, bridge);
+  return result.forget();
+}
+
+Instance::Instance(nsIGlobalObject* aOwner, WebGPUChild* aBridge)
+    : mBridge(aBridge), mOwner(aOwner) {}
+
+Instance::~Instance() { Cleanup(); }
+
+void Instance::Cleanup() {}
+
+JSObject* Instance::WrapObject(JSContext* cx,
+                               JS::Handle<JSObject*> givenProto) {
+  return dom::GPU_Binding::Wrap(cx, this, givenProto);
+}
+
+already_AddRefed<dom::Promise> Instance::RequestAdapter(
+    const dom::GPURequestAdapterOptions& aOptions, ErrorResult& aRv) {
+  RefPtr<dom::Promise> promise = dom::Promise::Create(mOwner, aRv);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return nullptr;
+  }
+  if (!mBridge) {
+    promise->MaybeRejectWithInvalidStateError("WebGPU is not enabled!");
+    return promise.forget();
+  }
+
+  RefPtr<Instance> instance = this;
+
+  mBridge->InstanceRequestAdapter(aOptions)->Then(
+      GetMainThreadSerialEventTarget(), __func__,
+      [promise, instance](RawId id) {
+        MOZ_ASSERT(id != 0);
+        RefPtr<Adapter> adapter = new Adapter(instance, id);
+        promise->MaybeResolve(adapter);
+      },
+      [promise](const Maybe<ipc::ResponseRejectReason>& aRv) {
+        if (aRv.isSome()) {
+          promise->MaybeRejectWithAbortError("Internal communication error!");
+        } else {
+          promise->MaybeRejectWithInvalidStateError(
+              "No matching adapter found!");
+        }
+      });
+
+  return promise.forget();
+}
+
+}  // namespace webgpu
+}  // namespace mozilla