dawn_node: Add binding/GPU.cpp

Bug: dawn:1123
Change-Id: I9d962a149c4bbb0fc8749fdb77c6ad29c59f0111
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/64916
Commit-Queue: Ben Clayton <bclayton@google.com>
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>

src/dawn_node/binding/CMakeLists.txt

@@ -19,6 +19,7 @@ add_library(dawn_node_binding STATIC
     "Converter.h"
     "Errors.cpp"
     "Errors.h"
+    "GPU.cpp"
     "GPU.h"
     "GPUAdapter.h"
     "GPUBindGroup.cpp"

src/dawn_node/binding/GPU.cpp

@@ -0,0 +1,55 @@
+// Copyright 2021 The Dawn Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "src/dawn_node/binding/GPU.h"
+
+#include "src/dawn_node/binding/GPUAdapter.h"
+
+namespace wgpu { namespace binding {
+
+    ////////////////////////////////////////////////////////////////////////////////
+    // wgpu::bindings::GPU
+    ////////////////////////////////////////////////////////////////////////////////
+    GPU::GPU() {
+        // TODO: Disable in 'release'
+        instance_.EnableBackendValidation(true);
+        instance_.SetBackendValidationLevel(dawn_native::BackendValidationLevel::Full);
+
+        instance_.DiscoverDefaultAdapters();
+    }
+
+    interop::Promise<std::optional<interop::Interface<interop::GPUAdapter>>> GPU::requestAdapter(
+        Napi::Env env,
+        std::optional<interop::GPURequestAdapterOptions> options) {
+        auto promise =
+            interop::Promise<std::optional<interop::Interface<interop::GPUAdapter>>>(env);
+
+        if (options.has_value() && options->forceFallbackAdapter) {
+            // Software adapters are not currently supported.
+            promise.Resolve({});
+            return promise;
+        }
+
+        auto adapters = instance_.GetAdapters();
+        if (adapters.empty()) {
+            promise.Resolve({});
+            return promise;
+        }
+
+        auto adapter = GPUAdapter::Create<GPUAdapter>(env, adapters[0]);
+        promise.Resolve(std::optional<interop::Interface<interop::GPUAdapter>>(adapter));
+        return promise;
+    }
+
+}}  // namespace wgpu::binding