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/* -*- 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
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