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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 "mozilla/dom/WebGPUBinding.h"
#include "Buffer.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/HoldDropJSObjects.h"
#include "mozilla/ipc/Shmem.h"
#include "ipc/WebGPUChild.h"
#include "js/RootingAPI.h"
#include "nsContentUtils.h"
#include "nsWrapperCache.h"
#include "Device.h"
namespace mozilla {
namespace webgpu {
GPU_IMPL_JS_WRAP(Buffer)
NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(Buffer, AddRef)
NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(Buffer, Release)
NS_IMPL_CYCLE_COLLECTION_CLASS(Buffer)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(Buffer)
tmp->Cleanup();
NS_IMPL_CYCLE_COLLECTION_UNLINK(mParent)
NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(Buffer)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParent)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(Buffer)
NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
if (tmp->mMapped) {
for (uint32_t i = 0; i < tmp->mMapped->mArrayBuffers.Length(); ++i) {
NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(
mMapped->mArrayBuffers[i])
}
}
NS_IMPL_CYCLE_COLLECTION_TRACE_END
Buffer::Buffer(Device* const aParent, RawId aId, BufferAddress aSize)
: ChildOf(aParent), mId(aId), mSize(aSize) {
mozilla::HoldJSObjects(this);
}
Buffer::~Buffer() {
Cleanup();
mozilla::DropJSObjects(this);
}
void Buffer::Cleanup() {
if (mValid && mParent) {
mValid = false;
auto bridge = mParent->GetBridge();
if (bridge && bridge->IsOpen()) {
bridge->SendBufferDestroy(mId);
}
if (bridge && mMapped) {
bridge->DeallocShmem(mMapped->mShmem);
}
}
}
void Buffer::SetMapped(ipc::Shmem&& aShmem, bool aWritable) {
MOZ_ASSERT(!mMapped);
mMapped.emplace();
mMapped->mShmem = std::move(aShmem);
mMapped->mWritable = aWritable;
}
already_AddRefed<dom::Promise> Buffer::MapAsync(
uint32_t aMode, uint64_t aOffset, const dom::Optional<uint64_t>& aSize,
ErrorResult& aRv) {
RefPtr<dom::Promise> promise = dom::Promise::Create(GetParentObject(), aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
if (mMapped) {
aRv.ThrowInvalidStateError("Unable to map a buffer that is already mapped");
return nullptr;
}
// Initialize with a dummy shmem, it will become real after the promise is
// resolved.
SetMapped(ipc::Shmem(), aMode == dom::GPUMapMode_Binding::WRITE);
const auto checked = aSize.WasPassed() ? CheckedInt<size_t>(aSize.Value())
: CheckedInt<size_t>(mSize) - aOffset;
if (!checked.isValid()) {
aRv.ThrowRangeError("Mapped size is too large");
return nullptr;
}
const auto& size = checked.value();
RefPtr<Buffer> self(this);
auto mappingPromise = mParent->MapBufferAsync(mId, aMode, aOffset, size, aRv);
if (!mappingPromise) {
return nullptr;
}
mappingPromise->Then(
GetMainThreadSerialEventTarget(), __func__,
[promise, self](ipc::Shmem&& aShmem) {
self->mMapped->mShmem = std::move(aShmem);
promise->MaybeResolve(0);
},
[promise](const ipc::ResponseRejectReason&) {
promise->MaybeRejectWithAbortError("Internal communication error!");
});
return promise.forget();
}
void Buffer::GetMappedRange(JSContext* aCx, uint64_t aOffset,
const dom::Optional<uint64_t>& aSize,
JS::Rooted<JSObject*>* aObject, ErrorResult& aRv) {
const auto checkedOffset = CheckedInt<size_t>(aOffset);
const auto checkedSize = aSize.WasPassed()
? CheckedInt<size_t>(aSize.Value())
: CheckedInt<size_t>(mSize) - aOffset;
if (!checkedOffset.isValid() || !checkedSize.isValid()) {
aRv.ThrowRangeError("Invalid mapped range");
return;
}
if (!mMapped || !mMapped->IsReady()) {
aRv.ThrowInvalidStateError("Buffer is not mapped");
return;
}
auto* const arrayBuffer = mParent->CreateExternalArrayBuffer(
aCx, checkedOffset.value(), checkedSize.value(), mMapped->mShmem);
if (!arrayBuffer) {
aRv.NoteJSContextException(aCx);
return;
}
aObject->set(arrayBuffer);
mMapped->mArrayBuffers.AppendElement(*aObject);
}
void Buffer::Unmap(JSContext* aCx, ErrorResult& aRv) {
if (!mMapped) {
return;
}
for (const auto& arrayBuffer : mMapped->mArrayBuffers) {
JS::Rooted<JSObject*> rooted(aCx, arrayBuffer);
bool ok = JS::DetachArrayBuffer(aCx, rooted);
if (!ok) {
aRv.NoteJSContextException(aCx);
return;
}
};
mParent->UnmapBuffer(mId, std::move(mMapped->mShmem), mMapped->mWritable);
mMapped.reset();
}
void Buffer::Destroy() {
// TODO: we don't have to implement it right now, but it's used by the
// examples
}
} // namespace webgpu
} // namespace mozilla
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