зеркало из https://github.com/mozilla/gecko-dev.git
129 строки
4.0 KiB
C++
129 строки
4.0 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/dom/WebGPUBinding.h"
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#include "Buffer.h"
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#include "mozilla/dom/ScriptSettings.h"
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#include "mozilla/ipc/Shmem.h"
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#include "nsContentUtils.h"
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#include "nsWrapperCache.h"
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#include "Device.h"
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namespace mozilla {
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namespace webgpu {
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GPU_IMPL_JS_WRAP(Buffer)
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NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(Buffer, AddRef)
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NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(Buffer, Release)
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NS_IMPL_CYCLE_COLLECTION_CLASS(Buffer)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(Buffer)
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mParent)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
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tmp->mMapping.reset();
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NS_IMPL_CYCLE_COLLECTION_UNLINK_END
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(Buffer)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParent)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
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NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(Buffer)
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NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
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if (tmp->mMapping) {
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NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mMapping->mArrayBuffer)
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}
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NS_IMPL_CYCLE_COLLECTION_TRACE_END
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Buffer::Mapping::Mapping(ipc::Shmem&& aShmem, JSObject* aArrayBuffer)
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: mShmem(MakeUnique<ipc::Shmem>(std::move(aShmem))),
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mArrayBuffer(aArrayBuffer) {}
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Buffer::Buffer(Device* const aParent, RawId aId, BufferAddress aSize)
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: ChildOf(aParent), mId(aId), mSize(aSize) {
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mozilla::HoldJSObjects(this);
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}
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Buffer::~Buffer() {
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if (mParent) {
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mParent->DestroyBuffer(mId);
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}
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mozilla::DropJSObjects(this);
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}
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void Buffer::InitMapping(ipc::Shmem&& aShmem, JSObject* aArrayBuffer) {
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mMapping.emplace(std::move(aShmem), aArrayBuffer);
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}
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already_AddRefed<dom::Promise> Buffer::MapReadAsync(ErrorResult& aRv) {
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RefPtr<dom::Promise> promise = dom::Promise::Create(GetParentObject(), aRv);
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if (NS_WARN_IF(aRv.Failed())) {
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return nullptr;
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}
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if (mMapping) {
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aRv.ThrowDOMException(NS_ERROR_DOM_INVALID_STATE_ERR,
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"Unable to map a buffer that is already mapped");
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return nullptr;
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}
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const auto checked = CheckedInt<size_t>(mSize);
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if (!checked.isValid()) {
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aRv.ThrowRangeError(u"Mapped size is too large");
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return nullptr;
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}
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const auto& size = checked.value();
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RefPtr<Buffer> self(this);
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auto mappingPromise = mParent->MapBufferForReadAsync(mId, size, aRv);
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if (!mappingPromise) {
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return nullptr;
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}
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mappingPromise->Then(
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GetMainThreadSerialEventTarget(), __func__,
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[promise, size, self](ipc::Shmem&& aShmem) {
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MOZ_ASSERT(aShmem.Size<uint8_t>() == size);
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dom::AutoJSAPI jsapi;
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if (!jsapi.Init(self->GetParentObject())) {
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promise->MaybeRejectWithDOMException(NS_ERROR_DOM_ABORT_ERR,
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"Owning page was unloaded!");
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return;
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}
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JS::Rooted<JSObject*> arrayBuffer(
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jsapi.cx(),
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Device::CreateExternalArrayBuffer(jsapi.cx(), size, aShmem));
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if (!arrayBuffer) {
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ErrorResult rv;
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rv.StealExceptionFromJSContext(jsapi.cx());
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promise->MaybeReject(rv);
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return;
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}
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JS::Rooted<JS::Value> val(jsapi.cx(), JS::ObjectValue(*arrayBuffer));
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self->mMapping.emplace(std::move(aShmem), arrayBuffer);
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promise->MaybeResolve(val);
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},
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[promise](const ipc::ResponseRejectReason&) {
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promise->MaybeRejectWithDOMException(NS_ERROR_DOM_ABORT_ERR,
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"Internal communication error!");
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});
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return promise.forget();
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}
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void Buffer::Unmap(JSContext* aCx, ErrorResult& aRv) {
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if (!mMapping) {
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return;
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}
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JS::Rooted<JSObject*> rooted(aCx, mMapping->mArrayBuffer);
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bool ok = JS::DetachArrayBuffer(aCx, rooted);
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if (!ok) {
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aRv.NoteJSContextException(aCx);
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return;
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}
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mParent->UnmapBuffer(mId, std::move(mMapping->mShmem));
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mMapping.reset();
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}
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} // namespace webgpu
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} // namespace mozilla
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