| // Copyright 2024 The Emscripten Authors. All rights reserved. |
| // Emscripten is available under two separate licenses, the MIT license and the |
| // University of Illinois/NCSA Open Source License. Both these licenses can be |
| // found in the LICENSE file. |
| |
| // |
| // This file and library_webgpu.js together implement <webgpu/webgpu.h>. |
| // |
| |
| #include <emscripten/emscripten.h> |
| #include <webgpu/webgpu.h> |
| |
| #include <array> |
| #include <atomic> |
| #include <cassert> |
| #include <cstdlib> |
| #include <map> |
| #include <memory> |
| #include <mutex> |
| #include <optional> |
| #include <set> |
| #include <tuple> |
| #include <unordered_map> |
| #include <utility> |
| #include <vector> |
| |
| using FutureID = uint64_t; |
| static constexpr FutureID kNullFutureId = 0; |
| using InstanceID = uint64_t; |
| |
| // ---------------------------------------------------------------------------- |
| // Declarations for JS emwgpu functions (defined in library_webgpu.js) |
| // ---------------------------------------------------------------------------- |
| extern "C" { |
| void emwgpuDelete(void* id); |
| |
| // Note that for the JS entry points, we pass uint64_t as pointer and decode it |
| // on the other side. |
| FutureID emwgpuWaitAny(FutureID const* futurePtr, |
| size_t futureCount, |
| uint64_t const* timeoutNSPtr); |
| |
| // Future/async operation that need to be forwarded to JS. |
| void emwgpuAdapterRequestDevice(WGPUAdapter adapter, |
| FutureID futureId, |
| FutureID deviceLostFutureId, |
| WGPUDevice device, |
| WGPUQueue queue, |
| const WGPUDeviceDescriptor* descriptor); |
| void emwgpuInstanceRequestAdapter(WGPUInstance instance, |
| FutureID futureId, |
| const WGPURequestAdapterOptions* options); |
| } // extern "C" |
| |
| // ---------------------------------------------------------------------------- |
| // Implementation details that are not exposed upwards in the API. |
| // ---------------------------------------------------------------------------- |
| |
| class NonCopyable { |
| protected: |
| constexpr NonCopyable() = default; |
| ~NonCopyable() = default; |
| |
| NonCopyable(NonCopyable&&) = default; |
| NonCopyable& operator=(NonCopyable&&) = default; |
| |
| private: |
| NonCopyable(const NonCopyable&) = delete; |
| void operator=(const NonCopyable&) = delete; |
| }; |
| |
| class NonMovable : NonCopyable { |
| protected: |
| constexpr NonMovable() = default; |
| ~NonMovable() = default; |
| |
| private: |
| NonMovable(NonMovable&&) = delete; |
| void operator=(NonMovable&&) = delete; |
| }; |
| |
| class RefCounted : NonMovable { |
| public: |
| static constexpr bool HasExternalRefCount = false; |
| |
| void AddRef() { |
| [[maybe_unused]] uint64_t oldRefCount = |
| mRefCount.fetch_add(1u, std::memory_order_relaxed); |
| assert(oldRefCount >= 1); |
| } |
| |
| void Release() { |
| if (mRefCount.fetch_sub(1u, std::memory_order_release) == 1u) { |
| std::atomic_thread_fence(std::memory_order_acquire); |
| emwgpuDelete(this); |
| delete this; |
| } |
| } |
| |
| private: |
| std::atomic<uint64_t> mRefCount = 1; |
| }; |
| |
| class RefCountedWithExternalCount : public RefCounted { |
| public: |
| static constexpr bool HasExternalRefCount = true; |
| |
| virtual ~RefCountedWithExternalCount() = default; |
| |
| void AddRef() { |
| AddExternalRef(); |
| RefCounted::AddRef(); |
| } |
| |
| void Release() { |
| if (mExternalRefCount.fetch_sub(1u, std::memory_order_release) == 1u) { |
| std::atomic_thread_fence(std::memory_order_acquire); |
| WillDropLastExternalRef(); |
| } |
| RefCounted::Release(); |
| } |
| |
| void AddExternalRef() { |
| mExternalRefCount.fetch_add(1u, std::memory_order_relaxed); |
| } |
| |
| private: |
| virtual void WillDropLastExternalRef() = 0; |
| |
| std::atomic<uint64_t> mExternalRefCount = 0; |
| }; |
| |
| template <typename T> |
| class Ref { |
| public: |
| static_assert(std::is_convertible_v<T, RefCounted*>, |
| "Cannot make a Ref<T> when T is not a Refcounted type."); |
| |
| Ref() : mValue(nullptr) {} |
| ~Ref() { Release(mValue); } |
| |
| // Constructors from nullptr. |
| // NOLINTNEXTLINE(runtime/explicit) |
| constexpr Ref(std::nullptr_t) : Ref() {} |
| |
| // Constructors from T. |
| // NOLINTNEXTLINE(runtime/explicit) |
| Ref(T value) : mValue(value) { AddRef(value); } |
| Ref<T>& operator=(const T& value) { |
| Set(value); |
| return *this; |
| } |
| |
| // Constructors from a Ref<T>. |
| Ref(const Ref<T>& other) : mValue(other.mValue) { AddRef(other.mValue); } |
| Ref<T>& operator=(const Ref<T>& other) { |
| Set(other.mValue); |
| return *this; |
| } |
| Ref(Ref<T>&& other) { mValue = other.Detach(); } |
| Ref<T>& operator=(Ref<T>&& other) { |
| if (&other != this) { |
| Release(mValue); |
| mValue = other.Detach(); |
| } |
| return *this; |
| } |
| |
| explicit operator bool() const { return !!mValue; } |
| |
| // Smart pointer methods. |
| const T& Get() const { return mValue; } |
| T& Get() { return mValue; } |
| const T operator->() const { return mValue; } |
| T operator->() { return mValue; } |
| |
| [[nodiscard]] T Detach() { |
| T value = mValue; |
| mValue = nullptr; |
| return value; |
| } |
| |
| void Acquire(T value) { |
| Release(mValue); |
| mValue = value; |
| } |
| |
| private: |
| static void AddRef(T value) { |
| if (value != nullptr) { |
| value->RefCounted::AddRef(); |
| } |
| } |
| static void Release(T value) { |
| if (value != nullptr) { |
| value->RefCounted::Release(); |
| } |
| } |
| |
| void Set(T value) { |
| if (mValue != value) { |
| // Ensure that the new value is referenced before the old is released to |
| // prevent any transitive frees that may affect the new value. |
| AddRef(value); |
| Release(mValue); |
| mValue = value; |
| } |
| } |
| |
| T mValue; |
| }; |
| |
| template <typename T> |
| auto ReturnToAPI(Ref<T*>&& object) { |
| if constexpr (T::HasExternalRefCount) { |
| // For an object which has external ref count, just need to increase the |
| // external ref count, and keep the total ref count unchanged. |
| object->AddExternalRef(); |
| } |
| return object.Detach(); |
| } |
| |
| // clang-format off |
| // X Macro to help generate boilerplate code for all refcounted object types. |
| #define WGPU_REFCOUNTED_OBJECTS(X) \ |
| X(Adapter) \ |
| X(BindGroup) \ |
| X(BindGroupLayout) \ |
| X(Buffer) \ |
| X(CommandBuffer) \ |
| X(CommandEncoder) \ |
| X(ComputePassEncoder) \ |
| X(ComputePipeline) \ |
| X(Device) \ |
| X(Instance) \ |
| X(PipelineLayout) \ |
| X(QuerySet) \ |
| X(Queue) \ |
| X(RenderBundle) \ |
| X(RenderBundleEncoder) \ |
| X(RenderPassEncoder) \ |
| X(RenderPipeline) \ |
| X(Sampler) \ |
| X(ShaderModule) \ |
| X(Surface) \ |
| X(SwapChain) \ |
| X(Texture) \ |
| X(TextureView) |
| |
| // X Macro to help generate boilerplate code for all passthrough object types. |
| // Passthrough objects refer to objects that are implemented via JS objects. |
| #define WGPU_PASSTHROUGH_OBJECTS(X) \ |
| X(BindGroup) \ |
| X(BindGroupLayout) \ |
| X(Buffer) \ |
| X(CommandBuffer) \ |
| X(CommandEncoder) \ |
| X(ComputePassEncoder) \ |
| X(ComputePipeline) \ |
| X(PipelineLayout) \ |
| X(QuerySet) \ |
| X(Queue) \ |
| X(RenderBundle) \ |
| X(RenderBundleEncoder) \ |
| X(RenderPassEncoder) \ |
| X(RenderPipeline) \ |
| X(Sampler) \ |
| X(ShaderModule) \ |
| X(Surface) \ |
| X(SwapChain) \ |
| X(Texture) \ |
| X(TextureView) |
| // clang-format on |
| |
| // ---------------------------------------------------------------------------- |
| // Future related structures and helpers. |
| // ---------------------------------------------------------------------------- |
| |
| enum class EventCompletionType { |
| Ready, |
| Shutdown, |
| }; |
| enum class EventType { |
| DeviceLost, |
| RequestAdapter, |
| RequestDevice, |
| }; |
| |
| class EventManager; |
| class TrackedEvent; |
| |
| class TrackedEvent : NonMovable { |
| public: |
| virtual ~TrackedEvent() = default; |
| virtual EventType GetType() = 0; |
| virtual void Complete(FutureID futureId, EventCompletionType type) = 0; |
| |
| protected: |
| TrackedEvent(InstanceID instance, WGPUCallbackMode mode) |
| : mInstanceId(instance), mMode(mode) {} |
| |
| private: |
| friend class EventManager; |
| |
| // Events need to keep track of the instance they came from for validation. |
| const InstanceID mInstanceId; |
| const WGPUCallbackMode mMode; |
| bool mIsReady = false; |
| }; |
| |
| // Compositable class for objects that provide entry point(s) that produce |
| // Events, i.e. returns a Future. |
| // |
| // Note that while it would be nice to make it so that C++ entry points |
| // implemented in here, and called from JS could use this abstraction in |
| // signatures, pointers passed between JS and C++ in WASM do not cast properly |
| // and results in undefined behavior. As an example, given: |
| // (1) WGPUAdapter emwgpuCreateAdapter(const EventSource* source); |
| // (2) WGPUAdapter emwgpuCreateAdapter(WGPUInstance instance); |
| // I tried to use (1), but when calling from JS, the pointer is not correctly |
| // adjusted so the value we end up getting when calling GetInstanceId() is some |
| // garbage. |
| class EventSource { |
| public: |
| explicit EventSource(InstanceID instanceId) : mInstanceId(instanceId) {} |
| InstanceID GetInstanceId() const { return mInstanceId; } |
| |
| private: |
| const InstanceID mInstanceId = 0; |
| }; |
| |
| // Thread-safe EventManager class that tracks all events. |
| // |
| // Note that there is a single global EventManager that should be accessed via |
| // GetEventManager(). The EventManager needs to outlive all WGPUInstances in |
| // order to handle Spontaneous events. |
| class EventManager : NonMovable { |
| public: |
| void RegisterInstance(InstanceID instance) { |
| assert(instance); |
| std::unique_lock<std::mutex> lock(mMutex); |
| mPerInstanceEvents.try_emplace(instance); |
| } |
| |
| void UnregisterInstance(InstanceID instance) { |
| assert(instance); |
| std::unique_lock<std::mutex> lock(mMutex); |
| auto it = mPerInstanceEvents.find(instance); |
| assert(it != mPerInstanceEvents.end()); |
| |
| // When unregistering the Instance, resolve all non-spontaneous callbacks |
| // with Shutdown. |
| for (const FutureID futureId : it->second) { |
| if (auto it = mEvents.find(futureId); it != mEvents.end()) { |
| it->second->Complete(futureId, EventCompletionType::Shutdown); |
| mEvents.erase(it); |
| } |
| } |
| mPerInstanceEvents.erase(instance); |
| } |
| |
| void ProcessEvents(InstanceID instance) { |
| assert(instance); |
| std::vector<std::pair<FutureID, std::unique_ptr<TrackedEvent>>> completable; |
| { |
| std::unique_lock<std::mutex> lock(mMutex); |
| auto instanceIt = mPerInstanceEvents.find(instance); |
| assert(instanceIt != mPerInstanceEvents.end()); |
| auto& instanceFutureIds = instanceIt->second; |
| |
| // Note that we are only currently handling AllowProcessEvents events, |
| // i.e. we are not handling AllowSpontaneous events in this loop. |
| for (auto futureIdsIt = instanceFutureIds.begin(); |
| futureIdsIt != instanceFutureIds.end();) { |
| FutureID futureId = *futureIdsIt; |
| auto eventIt = mEvents.find(futureId); |
| if (eventIt == mEvents.end()) { |
| ++futureIdsIt; |
| continue; |
| } |
| auto& event = eventIt->second; |
| |
| if (event->mMode == WGPUCallbackMode_AllowProcessEvents && |
| event->mIsReady) { |
| completable.emplace_back(futureId, std::move(event)); |
| mEvents.erase(eventIt); |
| futureIdsIt = instanceFutureIds.erase(futureIdsIt); |
| } else { |
| ++futureIdsIt; |
| } |
| } |
| } |
| |
| // Since the sets are ordered, the events must already be ordered by |
| // FutureID. |
| for (auto& [futureId, event] : completable) { |
| event->Complete(futureId, EventCompletionType::Ready); |
| } |
| } |
| |
| WGPUWaitStatus WaitAny(InstanceID instance, |
| size_t count, |
| WGPUFutureWaitInfo* infos, |
| uint64_t timeoutNS) { |
| assert(instance); |
| |
| if (count == 0) { |
| return WGPUWaitStatus_Success; |
| } |
| |
| // To handle timeouts, use Asyncify and proxy back into JS. |
| if (timeoutNS > 0) { |
| // Cannot handle timeouts if we are not using Asyncify. |
| if (!emscripten_has_asyncify()) { |
| return WGPUWaitStatus_UnsupportedTimeout; |
| } |
| |
| std::vector<FutureID> futures; |
| std::unordered_map<FutureID, WGPUFutureWaitInfo*> futureIdToInfo; |
| for (size_t i = 0; i < count; ++i) { |
| futures.push_back(infos[i].future.id); |
| futureIdToInfo.emplace(infos[i].future.id, &infos[i]); |
| } |
| |
| bool hasTimeout = timeoutNS != UINT64_MAX; |
| FutureID completedId = emwgpuWaitAny(futures.data(), count, |
| hasTimeout ? &timeoutNS : nullptr); |
| if (completedId == kNullFutureId) { |
| return WGPUWaitStatus_TimedOut; |
| } |
| futureIdToInfo[completedId]->completed = true; |
| |
| std::unique_ptr<TrackedEvent> completed; |
| { |
| std::unique_lock<std::mutex> lock(mMutex); |
| auto eventIt = mEvents.find(completedId); |
| if (eventIt == mEvents.end()) { |
| return WGPUWaitStatus_Success; |
| } |
| |
| completed = std::move(eventIt->second); |
| mEvents.erase(eventIt); |
| if (auto instanceIt = mPerInstanceEvents.find(instance); |
| instanceIt != mPerInstanceEvents.end()) { |
| instanceIt->second.erase(completedId); |
| } |
| } |
| |
| if (completed) { |
| completed->Complete(completedId, EventCompletionType::Ready); |
| } |
| return WGPUWaitStatus_Success; |
| } |
| |
| std::map<FutureID, std::unique_ptr<TrackedEvent>> completable; |
| bool anyCompleted = false; |
| { |
| std::unique_lock<std::mutex> lock(mMutex); |
| auto instanceIt = mPerInstanceEvents.find(instance); |
| assert(instanceIt != mPerInstanceEvents.end()); |
| auto& instanceFutureIds = instanceIt->second; |
| |
| for (size_t i = 0; i < count; ++i) { |
| FutureID futureId = infos[i].future.id; |
| auto eventIt = mEvents.find(futureId); |
| if (eventIt == mEvents.end()) { |
| infos[i].completed = true; |
| continue; |
| } |
| |
| auto& event = eventIt->second; |
| assert(event->mInstanceId == instance); |
| infos[i].completed = event->mIsReady; |
| if (event->mIsReady) { |
| anyCompleted = true; |
| completable.emplace(futureId, std::move(event)); |
| mEvents.erase(eventIt); |
| instanceFutureIds.erase(futureId); |
| } |
| } |
| } |
| |
| // We used an ordered map to collect the events, so they must be ordered. |
| for (auto& [futureId, event] : completable) { |
| event->Complete(futureId, EventCompletionType::Ready); |
| } |
| return anyCompleted ? WGPUWaitStatus_Success : WGPUWaitStatus_TimedOut; |
| } |
| |
| std::pair<FutureID, bool> TrackEvent(std::unique_ptr<TrackedEvent> event) { |
| FutureID futureId = mNextFutureId++; |
| InstanceID instance = event->mInstanceId; |
| std::unique_lock<std::mutex> lock(mMutex); |
| switch (event->mMode) { |
| case WGPUCallbackMode_WaitAnyOnly: |
| case WGPUCallbackMode_AllowProcessEvents: { |
| auto it = mPerInstanceEvents.find(instance); |
| if (it == mPerInstanceEvents.end()) { |
| // The instance has already been unregistered so just complete this |
| // event as shutdown now. |
| event->Complete(futureId, EventCompletionType::Shutdown); |
| return {futureId, false}; |
| } |
| it->second.insert(futureId); |
| mEvents.try_emplace(futureId, std::move(event)); |
| break; |
| } |
| case WGPUCallbackMode_AllowSpontaneous: { |
| mEvents.try_emplace(futureId, std::move(event)); |
| break; |
| } |
| default: { |
| // Invalid callback mode, so we just return kNullFutureId. |
| return {kNullFutureId, false}; |
| } |
| } |
| return {futureId, true}; |
| } |
| |
| template <typename Event, typename... ReadyArgs> |
| void SetFutureReady(FutureID futureId, ReadyArgs&&... readyArgs) { |
| std::unique_ptr<TrackedEvent> spontaneousEvent; |
| { |
| std::unique_lock<std::mutex> lock(mMutex); |
| auto eventIt = mEvents.find(futureId); |
| if (eventIt == mEvents.end()) { |
| return; |
| } |
| |
| auto& event = eventIt->second; |
| assert(event->GetType() == Event::kType); |
| static_cast<Event*>(event.get()) |
| ->ReadyHook(std::forward<ReadyArgs>(readyArgs)...); |
| event->mIsReady = true; |
| |
| // If the event can be spontaneously completed, prepare to do so now. |
| if (event->mMode == WGPUCallbackMode_AllowSpontaneous) { |
| spontaneousEvent = std::move(event); |
| mEvents.erase(futureId); |
| } |
| } |
| |
| if (spontaneousEvent) { |
| spontaneousEvent->Complete(futureId, EventCompletionType::Ready); |
| } |
| } |
| |
| private: |
| std::mutex mMutex; |
| std::atomic<FutureID> mNextFutureId = 1; |
| |
| // The EventManager separates events based on the WGPUInstance that the event |
| // stems from. |
| std::unordered_map<InstanceID, std::set<FutureID>> mPerInstanceEvents; |
| std::unordered_map<FutureID, std::unique_ptr<TrackedEvent>> mEvents; |
| }; |
| |
| static EventManager& GetEventManager() { |
| static EventManager kEventManager; |
| return kEventManager; |
| } |
| |
| // ---------------------------------------------------------------------------- |
| // WGPU struct declarations. |
| // ---------------------------------------------------------------------------- |
| |
| // Default struct declarations. |
| #define DEFINE_WGPU_DEFAULT_STRUCT(Name) \ |
| struct WGPU##Name##Impl final : public RefCounted {}; |
| WGPU_PASSTHROUGH_OBJECTS(DEFINE_WGPU_DEFAULT_STRUCT) |
| |
| // Instance is specially implemented in order to handle Futures implementation. |
| struct WGPUInstanceImpl final : public RefCounted, public EventSource { |
| public: |
| WGPUInstanceImpl(); |
| ~WGPUInstanceImpl(); |
| |
| void ProcessEvents(); |
| WGPUWaitStatus WaitAny(size_t count, |
| WGPUFutureWaitInfo* infos, |
| uint64_t timeoutNS); |
| |
| private: |
| static InstanceID GetNextInstanceId(); |
| }; |
| |
| struct WGPUAdapterImpl final : public RefCounted, public EventSource { |
| public: |
| WGPUAdapterImpl(const EventSource* source); |
| }; |
| |
| // Device is specially implemented in order to handle refcounting the Queue. |
| struct WGPUDeviceImpl final : public RefCountedWithExternalCount, |
| public EventSource { |
| public: |
| // Reservation constructor used when calling RequestDevice. |
| WGPUDeviceImpl(const EventSource* source, |
| const WGPUDeviceDescriptor* descriptor, |
| WGPUQueue queue); |
| // Injection constructor used when we already have a backing Device. |
| WGPUDeviceImpl(const EventSource* source, WGPUQueue queue); |
| |
| WGPUQueue GetQueue() const; |
| |
| void OnDeviceLost(WGPUDeviceLostReason reason, const char* message); |
| void OnUncapturedError(WGPUErrorType type, char const* message); |
| |
| private: |
| void WillDropLastExternalRef() override; |
| |
| Ref<WGPUQueue> mQueue; |
| WGPUUncapturedErrorCallbackInfo2 mUncapturedErrorCallbackInfo = |
| WGPU_UNCAPTURED_ERROR_CALLBACK_INFO_2_INIT; |
| FutureID mDeviceLostFutureId = kNullFutureId; |
| }; |
| |
| // ---------------------------------------------------------------------------- |
| // Future events. |
| // ---------------------------------------------------------------------------- |
| |
| class DeviceLostEvent final : public TrackedEvent { |
| public: |
| static constexpr EventType kType = EventType::DeviceLost; |
| |
| DeviceLostEvent(InstanceID instance, |
| WGPUDevice device, |
| const WGPUDeviceLostCallbackInfo2& callbackInfo) |
| : TrackedEvent(instance, callbackInfo.mode), |
| mCallback(callbackInfo.callback), |
| mUserdata1(callbackInfo.userdata1), |
| mUserdata2(callbackInfo.userdata2), |
| mDevice(device) { |
| assert(mDevice); |
| } |
| |
| EventType GetType() override { return kType; } |
| |
| void ReadyHook(WGPUDeviceLostReason reason, const char* message) { |
| mReason = reason; |
| if (message) { |
| mMessage = message; |
| } |
| } |
| |
| void Complete(FutureID, EventCompletionType type) override { |
| if (type == EventCompletionType::Shutdown) { |
| mReason = WGPUDeviceLostReason_InstanceDropped; |
| mMessage = "A valid external Instance reference no longer exists."; |
| } |
| if (mCallback) { |
| WGPUDevice device = mReason != WGPUDeviceLostReason_FailedCreation |
| ? mDevice.Get() |
| : nullptr; |
| mCallback(&device, mReason, mMessage ? mMessage->c_str() : nullptr, |
| mUserdata1, mUserdata2); |
| } |
| } |
| |
| private: |
| WGPUDeviceLostCallback2 mCallback = nullptr; |
| void* mUserdata1 = nullptr; |
| void* mUserdata2 = nullptr; |
| |
| Ref<WGPUDevice> mDevice; |
| |
| WGPUDeviceLostReason mReason; |
| std::optional<std::string> mMessage; |
| }; |
| |
| class RequestAdapterEvent final : public TrackedEvent { |
| public: |
| static constexpr EventType kType = EventType::RequestAdapter; |
| |
| RequestAdapterEvent(InstanceID instance, |
| const WGPURequestAdapterCallbackInfo2& callbackInfo) |
| : TrackedEvent(instance, callbackInfo.mode), |
| mCallback(callbackInfo.callback), |
| mUserdata1(callbackInfo.userdata1), |
| mUserdata2(callbackInfo.userdata2) {} |
| |
| EventType GetType() override { return kType; } |
| |
| void ReadyHook(WGPURequestAdapterStatus status, |
| WGPUAdapter adapter, |
| const char* message) { |
| mStatus = status; |
| mAdapter.Acquire(adapter); |
| if (message) { |
| mMessage = message; |
| } |
| } |
| |
| void Complete(FutureID, EventCompletionType type) override { |
| if (type == EventCompletionType::Shutdown) { |
| mStatus = WGPURequestAdapterStatus_InstanceDropped; |
| mMessage = "A valid external Instance reference no longer exists."; |
| } |
| if (mCallback) { |
| mCallback(mStatus, |
| mStatus == WGPURequestAdapterStatus_Success |
| ? ReturnToAPI(std::move(mAdapter)) |
| : nullptr, |
| mMessage ? mMessage->c_str() : nullptr, mUserdata1, mUserdata2); |
| } |
| } |
| |
| private: |
| WGPURequestAdapterCallback2 mCallback = nullptr; |
| void* mUserdata1 = nullptr; |
| void* mUserdata2 = nullptr; |
| |
| WGPURequestAdapterStatus mStatus; |
| Ref<WGPUAdapter> mAdapter; |
| std::optional<std::string> mMessage = std::nullopt; |
| }; |
| |
| class RequestDeviceEvent final : public TrackedEvent { |
| public: |
| static constexpr EventType kType = EventType::RequestDevice; |
| |
| RequestDeviceEvent(InstanceID instance, |
| const WGPURequestDeviceCallbackInfo2& callbackInfo) |
| : TrackedEvent(instance, callbackInfo.mode), |
| mCallback(callbackInfo.callback), |
| mUserdata1(callbackInfo.userdata1), |
| mUserdata2(callbackInfo.userdata2) {} |
| |
| EventType GetType() override { return kType; } |
| |
| void ReadyHook(WGPURequestDeviceStatus status, |
| WGPUDevice device, |
| const char* message) { |
| mStatus = status; |
| mDevice.Acquire(device); |
| if (message) { |
| mMessage = message; |
| } |
| } |
| |
| void Complete(FutureID, EventCompletionType type) override { |
| if (type == EventCompletionType::Shutdown) { |
| mStatus = WGPURequestDeviceStatus_InstanceDropped; |
| mMessage = "A valid external Instance reference no longer exists."; |
| } |
| if (mCallback) { |
| mCallback(mStatus, |
| mStatus == WGPURequestDeviceStatus_Success |
| ? ReturnToAPI(std::move(mDevice)) |
| : nullptr, |
| mMessage ? mMessage->c_str() : nullptr, mUserdata1, mUserdata2); |
| } |
| } |
| |
| private: |
| WGPURequestDeviceCallback2 mCallback = nullptr; |
| void* mUserdata1 = nullptr; |
| void* mUserdata2 = nullptr; |
| |
| WGPURequestDeviceStatus mStatus; |
| Ref<WGPUDevice> mDevice; |
| std::optional<std::string> mMessage = std::nullopt; |
| }; |
| |
| // ---------------------------------------------------------------------------- |
| // WGPU struct implementations. |
| // ---------------------------------------------------------------------------- |
| |
| // ---------------------------------------------------------------------------- |
| // WGPUAdapterImpl implementations. |
| // ---------------------------------------------------------------------------- |
| |
| WGPUAdapterImpl::WGPUAdapterImpl(const EventSource* source) |
| : EventSource(source->GetInstanceId()) {} |
| |
| // ---------------------------------------------------------------------------- |
| // WGPUInstanceImpl implementations. |
| // ---------------------------------------------------------------------------- |
| |
| WGPUInstanceImpl::WGPUInstanceImpl() : EventSource(GetNextInstanceId()) { |
| GetEventManager().RegisterInstance(GetInstanceId()); |
| } |
| WGPUInstanceImpl::~WGPUInstanceImpl() { |
| GetEventManager().UnregisterInstance(GetInstanceId()); |
| } |
| |
| void WGPUInstanceImpl::ProcessEvents() { |
| GetEventManager().ProcessEvents(GetInstanceId()); |
| } |
| |
| WGPUWaitStatus WGPUInstanceImpl::WaitAny(size_t count, |
| WGPUFutureWaitInfo* infos, |
| uint64_t timeoutNS) { |
| return GetEventManager().WaitAny(GetInstanceId(), count, infos, timeoutNS); |
| } |
| |
| InstanceID WGPUInstanceImpl::GetNextInstanceId() { |
| static std::atomic<InstanceID> kNextInstanceId = 1; |
| return kNextInstanceId++; |
| } |
| |
| // ---------------------------------------------------------------------------- |
| // WGPUDeviceImpl implementations. |
| // ---------------------------------------------------------------------------- |
| |
| WGPUDeviceImpl::WGPUDeviceImpl(const EventSource* source, |
| const WGPUDeviceDescriptor* descriptor, |
| WGPUQueue queue) |
| : EventSource(source->GetInstanceId()), |
| mUncapturedErrorCallbackInfo(descriptor->uncapturedErrorCallbackInfo2) { |
| // Create the DeviceLostEvent now. |
| std::tie(mDeviceLostFutureId, std::ignore) = |
| GetEventManager().TrackEvent(std::make_unique<DeviceLostEvent>( |
| source->GetInstanceId(), this, descriptor->deviceLostCallbackInfo2)); |
| mQueue.Acquire(queue); |
| } |
| |
| WGPUDeviceImpl::WGPUDeviceImpl(const EventSource* source, WGPUQueue queue) |
| : EventSource(source->GetInstanceId()) { |
| mQueue.Acquire(queue); |
| } |
| |
| WGPUQueue WGPUDeviceImpl::GetQueue() const { |
| auto queue = mQueue; |
| return ReturnToAPI(std::move(queue)); |
| } |
| |
| void WGPUDeviceImpl::OnDeviceLost(WGPUDeviceLostReason reason, |
| const char* message) { |
| if (mDeviceLostFutureId != kNullFutureId) { |
| GetEventManager().SetFutureReady<DeviceLostEvent>(mDeviceLostFutureId, |
| reason, message); |
| } |
| mDeviceLostFutureId = kNullFutureId; |
| } |
| |
| void WGPUDeviceImpl::OnUncapturedError(WGPUErrorType type, |
| char const* message) { |
| if (mUncapturedErrorCallbackInfo.callback) { |
| WGPUDeviceImpl* device = this; |
| mUncapturedErrorCallbackInfo.callback( |
| &device, type, message, mUncapturedErrorCallbackInfo.userdata1, |
| mUncapturedErrorCallbackInfo.userdata2); |
| } |
| } |
| |
| void WGPUDeviceImpl::WillDropLastExternalRef() { |
| OnDeviceLost(WGPUDeviceLostReason_Destroyed, "Device was destroyed."); |
| } |
| |
| // ---------------------------------------------------------------------------- |
| // Definitions for C++ emwgpu functions (callable from library_webgpu.js) |
| // ---------------------------------------------------------------------------- |
| extern "C" { |
| |
| // Object creation helpers that all return a pointer which is used as a key |
| // in the JS object table in library_webgpu.js. |
| #define DEFINE_EMWGPU_DEFAULT_CREATE(Name) \ |
| WGPU##Name emwgpuCreate##Name() { \ |
| return new WGPU##Name##Impl(); \ |
| } |
| WGPU_PASSTHROUGH_OBJECTS(DEFINE_EMWGPU_DEFAULT_CREATE) |
| |
| WGPUAdapter emwgpuCreateAdapter(WGPUInstance instance) { |
| return new WGPUAdapterImpl(instance); |
| } |
| |
| WGPUDevice emwgpuCreateDevice(WGPUInstance instance, WGPUQueue queue) { |
| return new WGPUDeviceImpl(instance, queue); |
| } |
| |
| // Future event callbacks. |
| void emwgpuOnDeviceLostCompleted(FutureID futureId, |
| WGPUDeviceLostReason reason, |
| const char* message) { |
| GetEventManager().SetFutureReady<DeviceLostEvent>(futureId, reason, message); |
| } |
| void emwgpuOnRequestAdapterCompleted(FutureID futureId, |
| WGPURequestAdapterStatus status, |
| WGPUAdapter adapter, |
| const char* message) { |
| GetEventManager().SetFutureReady<RequestAdapterEvent>(futureId, status, |
| adapter, message); |
| } |
| void emwgpuOnRequestDeviceCompleted(FutureID futureId, |
| WGPURequestDeviceStatus status, |
| WGPUDevice device, |
| const char* message) { |
| // This handler should always have a device since we pre-allocate it before |
| // calling out to JS. |
| assert(device); |
| if (status == WGPURequestDeviceStatus_Success) { |
| GetEventManager().SetFutureReady<RequestDeviceEvent>(futureId, status, |
| device, message); |
| } else { |
| // If the request failed, we need to resolve the DeviceLostEvent. |
| device->OnDeviceLost(WGPUDeviceLostReason_FailedCreation, |
| "Device failed at creation."); |
| GetEventManager().SetFutureReady<RequestDeviceEvent>(futureId, status, |
| nullptr, message); |
| } |
| } |
| |
| // Uncaptured error handler is similar to the Future event callbacks, but it |
| // doesn't go through the EventManager and just calls the callback on the Device |
| // immediately. |
| void emwgpuOnUncapturedError(WGPUDevice device, |
| WGPUErrorType type, |
| char const* message) { |
| device->OnUncapturedError(type, message); |
| } |
| |
| } // extern "C" |
| |
| // ---------------------------------------------------------------------------- |
| // WebGPU function definitions, with methods organized by "class". Note these |
| // don't need to be extern "C" because they are already declared in webgpu.h. |
| // |
| // Also note that the full set of functions declared in webgpu.h are only |
| // partially implemeted here. The remaining ones are implemented via |
| // library_webgpu.js. |
| // ---------------------------------------------------------------------------- |
| |
| // ---------------------------------------------------------------------------- |
| // Common AddRef/Release APIs are batch generated via X macros for all objects. |
| // ---------------------------------------------------------------------------- |
| |
| #define DEFINE_WGPU_DEFAULT_ADDREF_RELEASE(Name) \ |
| void wgpu##Name##AddRef(WGPU##Name o) { \ |
| o->AddRef(); \ |
| } \ |
| void wgpu##Name##Release(WGPU##Name o) { \ |
| o->Release(); \ |
| } |
| WGPU_REFCOUNTED_OBJECTS(DEFINE_WGPU_DEFAULT_ADDREF_RELEASE) |
| |
| // ---------------------------------------------------------------------------- |
| // Standalone (non-method) functions |
| // ---------------------------------------------------------------------------- |
| |
| void wgpuAdapterInfoFreeMembers(WGPUAdapterInfo value) { |
| free(const_cast<char*>(value.vendor)); |
| free(const_cast<char*>(value.architecture)); |
| free(const_cast<char*>(value.device)); |
| free(const_cast<char*>(value.description)); |
| } |
| |
| WGPUInstance wgpuCreateInstance([[maybe_unused]] const WGPUInstanceDescriptor* descriptor) { |
| assert(descriptor == nullptr); // descriptor not implemented yet |
| return new WGPUInstanceImpl(); |
| } |
| |
| void wgpuSurfaceCapabilitiesFreeMembers(WGPUSurfaceCapabilities) { |
| // wgpuSurfaceCapabilities doesn't currently allocate anything. |
| } |
| |
| // ---------------------------------------------------------------------------- |
| // Methods of Adapter |
| // ---------------------------------------------------------------------------- |
| |
| void wgpuAdapterRequestDevice(WGPUAdapter adapter, |
| const WGPUDeviceDescriptor* descriptor, |
| WGPURequestDeviceCallback callback, |
| void* userdata) { |
| WGPURequestDeviceCallbackInfo2 callbackInfo = {}; |
| callbackInfo.mode = WGPUCallbackMode_AllowSpontaneous; |
| callbackInfo.callback = [](WGPURequestDeviceStatus status, WGPUDevice device, |
| char const* message, void* callback, |
| void* userdata) { |
| auto cb = reinterpret_cast<WGPURequestDeviceCallback>(callback); |
| cb(status, device, message, userdata); |
| }; |
| callbackInfo.userdata1 = reinterpret_cast<void*>(callback); |
| callbackInfo.userdata2 = userdata; |
| wgpuAdapterRequestDevice2(adapter, descriptor, callbackInfo); |
| } |
| |
| WGPUFuture wgpuAdapterRequestDevice2( |
| WGPUAdapter adapter, |
| const WGPUDeviceDescriptor* descriptor, |
| WGPURequestDeviceCallbackInfo2 callbackInfo) { |
| auto [futureId, tracked] = |
| GetEventManager().TrackEvent(std::make_unique<RequestDeviceEvent>( |
| adapter->GetInstanceId(), callbackInfo)); |
| if (!tracked) { |
| return WGPUFuture{kNullFutureId}; |
| } |
| |
| static const WGPUDeviceDescriptor kDefaultDescriptor = |
| WGPU_DEVICE_DESCRIPTOR_INIT; |
| if (descriptor == nullptr) { |
| descriptor = &kDefaultDescriptor; |
| } |
| |
| // For RequestDevice, we always create a Device and Queue up front. The |
| // Device is also immediately associated with the DeviceLostEvent. |
| WGPUQueue queue = new WGPUQueueImpl(); |
| WGPUDevice device = new WGPUDeviceImpl(adapter, descriptor, queue); |
| |
| auto [deviceLostFutureId, _] = GetEventManager().TrackEvent( |
| std::make_unique<DeviceLostEvent>(adapter->GetInstanceId(), device, |
| descriptor->deviceLostCallbackInfo2)); |
| |
| emwgpuAdapterRequestDevice(adapter, futureId, deviceLostFutureId, device, |
| queue, descriptor); |
| return WGPUFuture{futureId}; |
| } |
| |
| // ---------------------------------------------------------------------------- |
| // Methods of BindGroup |
| // ---------------------------------------------------------------------------- |
| |
| // ---------------------------------------------------------------------------- |
| // Methods of BindGroupLayout |
| // ---------------------------------------------------------------------------- |
| |
| // ---------------------------------------------------------------------------- |
| // Methods of Buffer |
| // ---------------------------------------------------------------------------- |
| |
| // ---------------------------------------------------------------------------- |
| // Methods of CommandBuffer |
| // ---------------------------------------------------------------------------- |
| |
| // ---------------------------------------------------------------------------- |
| // Methods of CommandEncoder |
| // ---------------------------------------------------------------------------- |
| |
| // ---------------------------------------------------------------------------- |
| // Methods of ComputePassEncoder |
| // ---------------------------------------------------------------------------- |
| |
| // ---------------------------------------------------------------------------- |
| // Methods of ComputePipeline |
| // ---------------------------------------------------------------------------- |
| |
| // ---------------------------------------------------------------------------- |
| // Methods of Device |
| // ---------------------------------------------------------------------------- |
| |
| WGPUQueue wgpuDeviceGetQueue(WGPUDevice device) { |
| return device->GetQueue(); |
| } |
| |
| // ---------------------------------------------------------------------------- |
| // Methods of Instance |
| // ---------------------------------------------------------------------------- |
| |
| void wgpuInstanceProcessEvents(WGPUInstance instance) { |
| instance->ProcessEvents(); |
| } |
| |
| void wgpuInstanceRequestAdapter(WGPUInstance instance, |
| WGPURequestAdapterOptions const* options, |
| WGPURequestAdapterCallback callback, |
| void* userdata) { |
| WGPURequestAdapterCallbackInfo2 callbackInfo = {}; |
| callbackInfo.mode = WGPUCallbackMode_AllowSpontaneous; |
| callbackInfo.callback = [](WGPURequestAdapterStatus status, |
| WGPUAdapter adapter, char const* message, |
| void* callback, void* userdata) { |
| auto cb = reinterpret_cast<WGPURequestAdapterCallback>(callback); |
| cb(status, adapter, message, userdata); |
| }; |
| callbackInfo.userdata1 = reinterpret_cast<void*>(callback); |
| callbackInfo.userdata2 = userdata; |
| wgpuInstanceRequestAdapter2(instance, options, callbackInfo); |
| } |
| |
| WGPUFuture wgpuInstanceRequestAdapter2( |
| WGPUInstance instance, |
| WGPURequestAdapterOptions const* options, |
| WGPURequestAdapterCallbackInfo2 callbackInfo) { |
| auto [futureId, tracked] = |
| GetEventManager().TrackEvent(std::make_unique<RequestAdapterEvent>( |
| instance->GetInstanceId(), callbackInfo)); |
| if (!tracked) { |
| return WGPUFuture{kNullFutureId}; |
| } |
| |
| emwgpuInstanceRequestAdapter(instance, futureId, options); |
| return WGPUFuture{futureId}; |
| } |
| |
| WGPUWaitStatus wgpuInstanceWaitAny(WGPUInstance instance, |
| size_t futureCount, |
| WGPUFutureWaitInfo* futures, |
| uint64_t timeoutNS) { |
| return instance->WaitAny(futureCount, futures, timeoutNS); |
| } |
| |
| // ---------------------------------------------------------------------------- |
| // Methods of PipelineLayout |
| // ---------------------------------------------------------------------------- |
| |
| // ---------------------------------------------------------------------------- |
| // Methods of QuerySet |
| // ---------------------------------------------------------------------------- |
| |
| // ---------------------------------------------------------------------------- |
| // Methods of Queue |
| // ---------------------------------------------------------------------------- |
| |
| // ---------------------------------------------------------------------------- |
| // Methods of RenderBundle |
| // ---------------------------------------------------------------------------- |
| |
| // ---------------------------------------------------------------------------- |
| // Methods of RenderBundleEncoder |
| // ---------------------------------------------------------------------------- |
| |
| // ---------------------------------------------------------------------------- |
| // Methods of RenderPassEncoder |
| // ---------------------------------------------------------------------------- |
| |
| // ---------------------------------------------------------------------------- |
| // Methods of RenderPipeline |
| // ---------------------------------------------------------------------------- |
| |
| // ---------------------------------------------------------------------------- |
| // Methods of Sampler |
| // ---------------------------------------------------------------------------- |
| |
| // ---------------------------------------------------------------------------- |
| // Methods of ShaderModule |
| // ---------------------------------------------------------------------------- |
| |
| // ---------------------------------------------------------------------------- |
| // Methods of Surface |
| // ---------------------------------------------------------------------------- |
| |
| WGPUStatus wgpuSurfaceGetCapabilities(WGPUSurface surface, |
| WGPUAdapter adapter, |
| WGPUSurfaceCapabilities* capabilities) { |
| assert(capabilities->nextInChain == nullptr); // TODO: Return WGPUStatus_Error |
| |
| static constexpr std::array<WGPUTextureFormat, 3> kSurfaceFormatsRGBAFirst = { |
| WGPUTextureFormat_RGBA8Unorm, |
| WGPUTextureFormat_BGRA8Unorm, |
| WGPUTextureFormat_RGBA16Float, |
| }; |
| static constexpr std::array<WGPUTextureFormat, 3> kSurfaceFormatsBGRAFirst = { |
| WGPUTextureFormat_BGRA8Unorm, |
| WGPUTextureFormat_RGBA8Unorm, |
| WGPUTextureFormat_RGBA16Float, |
| }; |
| WGPUTextureFormat preferredFormat = wgpuSurfaceGetPreferredFormat(surface, adapter); |
| switch (preferredFormat) { |
| case WGPUTextureFormat_RGBA8Unorm: |
| capabilities->formatCount = kSurfaceFormatsRGBAFirst.size(); |
| capabilities->formats = kSurfaceFormatsRGBAFirst.data(); |
| break; |
| case WGPUTextureFormat_BGRA8Unorm: |
| capabilities->formatCount = kSurfaceFormatsBGRAFirst.size(); |
| capabilities->formats = kSurfaceFormatsBGRAFirst.data(); |
| break; |
| default: |
| assert(false); |
| return WGPUStatus_Error; |
| } |
| |
| { |
| static constexpr WGPUPresentMode kPresentMode = WGPUPresentMode_Fifo; |
| capabilities->presentModeCount = 1; |
| capabilities->presentModes = &kPresentMode; |
| } |
| |
| { |
| static constexpr std::array<WGPUCompositeAlphaMode, 2> kAlphaModes = { |
| WGPUCompositeAlphaMode_Opaque, |
| WGPUCompositeAlphaMode_Premultiplied, |
| }; |
| capabilities->alphaModeCount = kAlphaModes.size(); |
| capabilities->alphaModes = kAlphaModes.data(); |
| } |
| |
| return WGPUStatus_Success; |
| } |
| |
| // ---------------------------------------------------------------------------- |
| // Methods of SwapChain |
| // ---------------------------------------------------------------------------- |
| |
| // ---------------------------------------------------------------------------- |
| // Methods of Texture |
| // ---------------------------------------------------------------------------- |
| |
| // ---------------------------------------------------------------------------- |
| // Methods of TextureView |
| // ---------------------------------------------------------------------------- |
