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-rw-r--r--dom/webgpu/Instance.cpp125
1 files changed, 125 insertions, 0 deletions
diff --git a/dom/webgpu/Instance.cpp b/dom/webgpu/Instance.cpp
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+++ b/dom/webgpu/Instance.cpp
@@ -0,0 +1,125 @@
+/* -*- 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 "nsIGlobalObject.h"
+#include "ipc/WebGPUChild.h"
+#include "ipc/WebGPUTypes.h"
+#include "mozilla/webgpu/ffi/wgpu.h"
+#include "mozilla/dom/Promise.h"
+#include "mozilla/gfx/CanvasManagerChild.h"
+#include "mozilla/gfx/gfxVars.h"
+#include "mozilla/StaticPrefs_dom.h"
+
+#include <optional>
+#include <string_view>
+
+namespace mozilla::webgpu {
+
+GPU_IMPL_CYCLE_COLLECTION(Instance, mOwner)
+
+static inline nsDependentCString ToCString(const std::string_view s) {
+ return {s.data(), s.length()};
+}
+
+/* static */ bool Instance::PrefEnabled(JSContext* aCx, JSObject* aObj) {
+ if (!StaticPrefs::dom_webgpu_enabled()) {
+ return false;
+ }
+
+ if (NS_IsMainThread()) {
+ return true;
+ }
+
+ return StaticPrefs::dom_webgpu_workers_enabled();
+}
+
+/*static*/
+already_AddRefed<Instance> Instance::Create(nsIGlobalObject* aOwner) {
+ RefPtr<Instance> result = new Instance(aOwner);
+ return result.forget();
+}
+
+Instance::Instance(nsIGlobalObject* aOwner) : 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;
+ }
+
+ // -
+ // Check if we should allow the request.
+
+ const auto errStr = [&]() -> std::optional<std::string_view> {
+#ifdef RELEASE_OR_BETA
+ if (true) {
+ return "WebGPU is not yet available in Release or Beta builds.";
+ }
+#endif
+ if (!gfx::gfxVars::AllowWebGPU()) {
+ return "WebGPU is disabled by blocklist.";
+ }
+ if (!StaticPrefs::dom_webgpu_enabled()) {
+ return "WebGPU is disabled by dom.webgpu.enabled:false.";
+ }
+ return {};
+ }();
+ if (errStr) {
+ promise->MaybeRejectWithNotSupportedError(ToCString(*errStr));
+ return promise.forget();
+ }
+
+ // -
+ // Make the request.
+
+ auto* const canvasManager = gfx::CanvasManagerChild::Get();
+ if (!canvasManager) {
+ promise->MaybeRejectWithInvalidStateError(
+ "Failed to create CanavasManagerChild");
+ return promise.forget();
+ }
+
+ RefPtr<WebGPUChild> bridge = canvasManager->GetWebGPUChild();
+ if (!bridge) {
+ promise->MaybeRejectWithInvalidStateError("Failed to create WebGPUChild");
+ return promise.forget();
+ }
+
+ RefPtr<Instance> instance = this;
+
+ bridge->InstanceRequestAdapter(aOptions)->Then(
+ GetCurrentSerialEventTarget(), __func__,
+ [promise, instance, bridge](ipc::ByteBuf aInfoBuf) {
+ auto info = std::make_shared<ffi::WGPUAdapterInformation>();
+ ffi::wgpu_client_adapter_extract_info(ToFFI(&aInfoBuf), info.get());
+ MOZ_ASSERT(info->id != 0);
+ RefPtr<Adapter> adapter = new Adapter(instance, bridge, info);
+ promise->MaybeResolve(adapter);
+ },
+ [promise](const Maybe<ipc::ResponseRejectReason>& aResponseReason) {
+ if (aResponseReason.isSome()) {
+ promise->MaybeRejectWithAbortError("Internal communication error!");
+ } else {
+ promise->MaybeResolve(JS::NullHandleValue);
+ }
+ });
+
+ return promise.forget();
+}
+
+} // namespace mozilla::webgpu