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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 <optional>
#include <string_view>
#include "Adapter.h"
#include "ipc/WebGPUChild.h"
#include "ipc/WebGPUTypes.h"
#include "js/Value.h"
#include "mozilla/Assertions.h"
#include "mozilla/ErrorResult.h"
#include "mozilla/StaticPrefs_dom.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/dom/WorkerPrivate.h"
#include "mozilla/gfx/CanvasManagerChild.h"
#include "mozilla/gfx/Logging.h"
#include "mozilla/gfx/gfxVars.h"
#include "mozilla/webgpu/ffi/wgpu.h"
#include "nsDebug.h"
#include "nsIGlobalObject.h"
#include "nsString.h"
#include "nsStringFwd.h"
namespace mozilla::webgpu {
GPU_IMPL_CYCLE_COLLECTION(WGSLLanguageFeatures, mParent)
GPU_IMPL_CYCLE_COLLECTION(Instance, mOwner, mWgslLanguageFeatures)
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;
}
dom::WorkerPrivate* wp = dom::GetCurrentThreadWorkerPrivate();
if (wp && wp->IsServiceWorker()) {
return StaticPrefs::dom_webgpu_service_workers_enabled();
}
return true;
}
/* static */ bool Instance::ExternalTexturePrefEnabled(JSContext* aCx,
JSObject* aObj) {
return StaticPrefs::dom_webgpu_external_texture_enabled_AtStartup();
}
/*static*/
already_AddRefed<Instance> Instance::Create(nsIGlobalObject* aOwner) {
RefPtr<Instance> result = new Instance(aOwner);
return result.forget();
}
Instance::Instance(nsIGlobalObject* aOwner)
: mOwner(aOwner), mWgslLanguageFeatures(new WGSLLanguageFeatures(this)) {
// Populate `mWgslLanguageFeatures`.
IgnoredErrorResult rv;
nsCString wgslFeature;
for (size_t i = 0;; ++i) {
wgslFeature.Truncate(0);
ffi::wgpu_client_instance_get_wgsl_language_feature(&wgslFeature, i);
if (wgslFeature.IsEmpty()) {
break;
}
NS_ConvertASCIItoUTF16 feature{wgslFeature};
this->mWgslLanguageFeatures->Add(feature, rv);
if (rv.Failed()) {
if (rv.ErrorCodeIs(NS_ERROR_UNEXPECTED)) {
// This is fine; something went wrong with the JS scope we're in, and we
// can just let that happen.
NS_WARNING(
"`Instance::Instance`: failed to append WGSL language feature: got "
"`NS_ERROR_UNEXPECTED`");
} else {
MOZ_CRASH_UNSAFE_PRINTF(
"`Instance::Instance`: failed to append WGSL language feature: %d",
rv.ErrorCodeAsInt());
}
}
}
}
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.
std::optional<std::string_view> rejectionMessage = {};
const auto rejectIf = [&rejectionMessage](bool condition,
const char* message) {
if (condition && !rejectionMessage.has_value()) {
rejectionMessage = message;
}
};
#ifndef EARLY_BETA_OR_EARLIER
if (dom::WorkerPrivate* wp = dom::GetCurrentThreadWorkerPrivate()) {
rejectIf(wp->IsServiceWorker(),
"WebGPU in service workers is not yet available in Release or "
"late Beta builds; see "
"<https://bugzilla.mozilla.org/show_bug.cgi?id=1942431>.");
}
#endif
rejectIf(!gfx::gfxVars::AllowWebGPU(), "WebGPU is disabled by blocklist.");
rejectIf(!StaticPrefs::dom_webgpu_enabled(),
"WebGPU is disabled because the `dom.webgpu.enabled` pref. is set "
"to `false`.");
#ifdef WIN32
# ifndef MOZ_DXCOMPILER
rejectIf(true,
"WebGPU is disabled because dxcompiler is unavailable with this "
"build configuration");
# endif
#endif
// Check if WebGPU is blocked for this global's domain.
{
const auto prefLock = mozilla::StaticPrefs::dom_webgpu_blocked_domains();
rejectIf(nsContentUtils::IsURIInList(mOwner->GetBaseURI(), *prefLock),
"WebGPU is blocked for this domain by the "
"`dom.webgpu.blocked-domains` pref.");
}
if (rejectionMessage) {
promise->MaybeRejectWithNotSupportedError(ToCString(*rejectionMessage));
return promise.forget();
}
// -
// Make the request.
auto* const canvasManager = gfx::CanvasManagerChild::Get();
if (!canvasManager) {
promise->MaybeRejectWithInvalidStateError(
"Failed to create CanvasManagerChild");
return promise.forget();
}
RefPtr<WebGPUChild> child = canvasManager->GetWebGPUChild();
if (!child) {
promise->MaybeRejectWithInvalidStateError("Failed to create WebGPUChild");
return promise.forget();
}
if (aOptions.mFeatureLevel.EqualsASCII("core")) {
// Good! That's all we support.
} else if (aOptions.mFeatureLevel.EqualsASCII("compatibility")) {
dom::AutoJSAPI api;
if (api.Init(mOwner)) {
JS::WarnUTF8(api.cx(),
"User requested a WebGPU adapter with `featureLevel: "
"\"compatibility\"`, which is not yet supported; returning "
"a \"core\"-defaulting adapter for now. Subscribe to "
"<https://bugzilla.mozilla.org/show_bug.cgi?id=1905951>"
" for updates on its development in Firefox.");
}
} else {
NS_ConvertUTF16toUTF8 featureLevel(aOptions.mFeatureLevel);
dom::AutoJSAPI api;
if (api.Init(mOwner)) {
JS::WarnUTF8(api.cx(),
"expected one of `\"core\"` or `\"compatibility\"` for "
"`GPUAdapter.featureLevel`, got %s",
featureLevel.get());
}
promise->MaybeResolve(JS::NullValue());
return promise.forget();
}
if (aOptions.mXrCompatible) {
dom::AutoJSAPI api;
if (api.Init(mOwner)) {
JS::WarnUTF8(
api.cx(),
"User requested a WebGPU adapter with `xrCompatible: true`, "
"but WebXR sessions are not yet supported in WebGPU. Returning "
"a regular adapter for now. Subscribe to "
"<https://bugzilla.mozilla.org/show_bug.cgi?id=1963829>"
" for updates on its development in Firefox.");
}
}
ffi::WGPUPowerPreference power_preference;
if (aOptions.mPowerPreference.WasPassed()) {
power_preference = static_cast<ffi::WGPUPowerPreference>(
aOptions.mPowerPreference.Value());
} else {
power_preference = ffi::WGPUPowerPreference_LowPower;
}
RawId adapter_id = ffi::wgpu_client_request_adapter(
child->GetClient(), power_preference, aOptions.mForceFallbackAdapter);
auto pending_promise = WebGPUChild::PendingRequestAdapterPromise{
RefPtr(promise), RefPtr(this), adapter_id};
child->mPendingRequestAdapterPromises.push_back(std::move(pending_promise));
return promise.forget();
}
} // namespace mozilla::webgpu
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