dawn_node: Add Module.cpp

This is the node plugin entrypoint

Bug: dawn:1123
Change-Id: I4a48b047482a7c9f1a0f10cc2a5a02721d103b8a
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/64940
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Ben Clayton <bclayton@google.com>

src/dawn_node/CMakeLists.txt

@@ -57,3 +57,24 @@ endfunction()
 
 add_subdirectory(binding)
 add_subdirectory(interop)
+
+add_library(dawn_node SHARED "Module.cpp")
+set_target_properties(dawn_node PROPERTIES
+    PREFIX ""
+    OUTPUT_NAME "dawn"
+    SUFFIX ".node"
+    LIBRARY_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}"
+)
+target_link_libraries(dawn_node dawn_node_binding dawn_node_interop dawn_native dawncpp dawn_proc)
+target_include_directories(dawn_node PRIVATE
+    ${CMAKE_SOURCE_DIR}
+    ${NODE_API_HEADERS_DIR}
+    ${NODE_ADDON_API_DIR}
+    ${GEN_DIR}
+)
+
+# dawn_node targets require C++17
+set_property(
+    TARGET dawn_node
+    PROPERTY CXX_STANDARD 17
+)

src/dawn_node/Module.cpp

@@ -0,0 +1,35 @@
+// 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 "dawn/dawn_proc.h"
+#include "src/dawn_node/binding/GPU.h"
+
+// Initialize() initializes the Dawn node module, registering all the WebGPU
+// types into the global object, and adding the 'gpu' property on the exported
+// object.
+Napi::Object Initialize(Napi::Env env, Napi::Object exports) {
+    // Begin by setting the Dawn procedure function pointers.
+    dawnProcSetProcs(&dawn_native::GetProcs());
+
+    // Register all the interop types
+    wgpu::interop::Initialize(env);
+
+    // Construct a wgpu::interop::GPU interface, implemented by
+    // wgpu::bindings::GPU. This will be the 'gpu' field of exported object.
+    auto gpu = wgpu::interop::GPU::Create<wgpu::binding::GPU>(env);
+    exports.Set(Napi::String::New(env, "gpu"), gpu);
+    return exports;
+}
+
+NODE_API_MODULE(addon, Initialize)