nvnflinger: fix name

src/core/hle/service/nvnflinger/binder.h

@@ -0,0 +1,45 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2014 The Android Open Source Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Parts of this implementation were based on:
+// https://cs.android.com/android/platform/superproject/+/android-5.1.1_r38:frameworks/native/include/binder/IBinder.h
+
+#pragma once
+
+#include "common/common_types.h"
+
+namespace Kernel {
+class KReadableEvent;
+} // namespace Kernel
+
+namespace Service {
+class HLERequestContext;
+}
+
+namespace Service::android {
+
+enum class TransactionId {
+    RequestBuffer = 1,
+    SetBufferCount = 2,
+    DequeueBuffer = 3,
+    DetachBuffer = 4,
+    DetachNextBuffer = 5,
+    AttachBuffer = 6,
+    QueueBuffer = 7,
+    CancelBuffer = 8,
+    Query = 9,
+    Connect = 10,
+    Disconnect = 11,
+    AllocateBuffers = 13,
+    SetPreallocatedBuffer = 14,
+    GetBufferHistory = 17,
+};
+
+class IBinder {
+public:
+    virtual ~IBinder() = default;
+    virtual void Transact(HLERequestContext& ctx, android::TransactionId code, u32 flags) = 0;
+    virtual Kernel::KReadableEvent& GetNativeHandle() = 0;
+};
+
+} // namespace Service::android

src/core/hle/service/nvnflinger/buffer_item.h

@@ -0,0 +1,46 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2014 The Android Open Source Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Parts of this implementation were based on:
+// https://cs.android.com/android/platform/superproject/+/android-5.1.1_r38:frameworks/native/include/gui/BufferItem.h
+
+#pragma once
+
+#include <memory>
+
+#include "common/common_types.h"
+#include "common/math_util.h"
+#include "core/hle/service/nvnflinger/ui/fence.h"
+#include "core/hle/service/nvnflinger/window.h"
+
+namespace Service::android {
+
+class GraphicBuffer;
+
+class BufferItem final {
+public:
+    constexpr BufferItem() = default;
+
+    std::shared_ptr<GraphicBuffer> graphic_buffer;
+    Fence fence;
+    Common::Rectangle<s32> crop;
+    NativeWindowTransform transform{};
+    u32 scaling_mode{};
+    s64 timestamp{};
+    bool is_auto_timestamp{};
+    u64 frame_number{};
+
+    // The default value for buf, used to indicate this doesn't correspond to a slot.
+    static constexpr s32 INVALID_BUFFER_SLOT = -1;
+    union {
+        s32 slot{INVALID_BUFFER_SLOT};
+        s32 buf;
+    };
+
+    bool is_droppable{};
+    bool acquire_called{};
+    bool transform_to_display_inverse{};
+    s32 swap_interval{};
+};
+
+} // namespace Service::android

src/core/hle/service/nvnflinger/buffer_item_consumer.cpp

@@ -0,0 +1,59 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2012 The Android Open Source Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Parts of this implementation were based on:
+// https://cs.android.com/android/platform/superproject/+/android-5.1.1_r38:frameworks/native/libs/gui/BufferItemConsumer.cpp
+
+#include "common/assert.h"
+#include "common/logging/log.h"
+#include "core/hle/service/nvnflinger/buffer_item.h"
+#include "core/hle/service/nvnflinger/buffer_item_consumer.h"
+#include "core/hle/service/nvnflinger/buffer_queue_consumer.h"
+
+namespace Service::android {
+
+BufferItemConsumer::BufferItemConsumer(std::unique_ptr<BufferQueueConsumer> consumer_)
+    : ConsumerBase{std::move(consumer_)} {}
+
+Status BufferItemConsumer::AcquireBuffer(BufferItem* item, std::chrono::nanoseconds present_when,
+                                         bool wait_for_fence) {
+    if (!item) {
+        return Status::BadValue;
+    }
+
+    std::scoped_lock lock{mutex};
+
+    if (const auto status = AcquireBufferLocked(item, present_when); status != Status::NoError) {
+        if (status != Status::NoBufferAvailable) {
+            LOG_ERROR(Service_Nvnflinger, "Failed to acquire buffer: {}", status);
+        }
+        return status;
+    }
+
+    if (wait_for_fence) {
+        UNIMPLEMENTED();
+    }
+
+    item->graphic_buffer = slots[item->slot].graphic_buffer;
+
+    return Status::NoError;
+}
+
+Status BufferItemConsumer::ReleaseBuffer(const BufferItem& item, const Fence& release_fence) {
+    std::scoped_lock lock{mutex};
+
+    if (const auto status = AddReleaseFenceLocked(item.buf, item.graphic_buffer, release_fence);
+        status != Status::NoError) {
+        LOG_ERROR(Service_Nvnflinger, "Failed to add fence: {}", status);
+    }
+
+    if (const auto status = ReleaseBufferLocked(item.buf, item.graphic_buffer);
+        status != Status::NoError) {
+        LOG_WARNING(Service_Nvnflinger, "Failed to release buffer: {}", status);
+        return status;
+    }
+
+    return Status::NoError;
+}
+
+} // namespace Service::android

src/core/hle/service/nvnflinger/buffer_item_consumer.h

@@ -0,0 +1,28 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2012 The Android Open Source Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Parts of this implementation were based on:
+// https://cs.android.com/android/platform/superproject/+/android-5.1.1_r38:frameworks/native/include/gui/BufferItemConsumer.h
+
+#pragma once
+
+#include <chrono>
+#include <memory>
+
+#include "common/common_types.h"
+#include "core/hle/service/nvnflinger/consumer_base.h"
+#include "core/hle/service/nvnflinger/status.h"
+
+namespace Service::android {
+
+class BufferItem;
+
+class BufferItemConsumer final : public ConsumerBase {
+public:
+    explicit BufferItemConsumer(std::unique_ptr<BufferQueueConsumer> consumer);
+    Status AcquireBuffer(BufferItem* item, std::chrono::nanoseconds present_when,
+                         bool wait_for_fence = true);
+    Status ReleaseBuffer(const BufferItem& item, const Fence& release_fence);
+};
+
+} // namespace Service::android

src/core/hle/service/nvnflinger/buffer_queue_consumer.cpp

@@ -0,0 +1,213 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2014 The Android Open Source Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Parts of this implementation were based on:
+// https://cs.android.com/android/platform/superproject/+/android-5.1.1_r38:frameworks/native/libs/gui/BufferQueueConsumer.cpp
+
+#include "common/logging/log.h"
+#include "core/hle/service/nvdrv/core/nvmap.h"
+#include "core/hle/service/nvnflinger/buffer_item.h"
+#include "core/hle/service/nvnflinger/buffer_queue_consumer.h"
+#include "core/hle/service/nvnflinger/buffer_queue_core.h"
+#include "core/hle/service/nvnflinger/producer_listener.h"
+#include "core/hle/service/nvnflinger/ui/graphic_buffer.h"
+
+namespace Service::android {
+
+BufferQueueConsumer::BufferQueueConsumer(std::shared_ptr<BufferQueueCore> core_,
+                                         Service::Nvidia::NvCore::NvMap& nvmap_)
+    : core{std::move(core_)}, slots{core->slots}, nvmap(nvmap_) {}
+
+BufferQueueConsumer::~BufferQueueConsumer() = default;
+
+Status BufferQueueConsumer::AcquireBuffer(BufferItem* out_buffer,
+                                          std::chrono::nanoseconds expected_present) {
+    std::scoped_lock lock{core->mutex};
+
+    // Check that the consumer doesn't currently have the maximum number of buffers acquired.
+    const s32 num_acquired_buffers{
+        static_cast<s32>(std::count_if(slots.begin(), slots.end(), [](const auto& slot) {
+            return slot.buffer_state == BufferState::Acquired;
+        }))};
+
+    if (num_acquired_buffers >= core->max_acquired_buffer_count + 1) {
+        LOG_ERROR(Service_Nvnflinger, "max acquired buffer count reached: {} (max {})",
+                  num_acquired_buffers, core->max_acquired_buffer_count);
+        return Status::InvalidOperation;
+    }
+
+    // Check if the queue is empty.
+    if (core->queue.empty()) {
+        return Status::NoBufferAvailable;
+    }
+
+    auto front(core->queue.begin());
+
+    // If expected_present is specified, we may not want to return a buffer yet.
+    if (expected_present.count() != 0) {
+        constexpr auto MAX_REASONABLE_NSEC = 1000000000LL; // 1 second
+
+        // The expected_present argument indicates when the buffer is expected to be presented
+        // on-screen.
+        while (core->queue.size() > 1 && !core->queue[0].is_auto_timestamp) {
+            const auto& buffer_item{core->queue[1]};
+
+            // If entry[1] is timely, drop entry[0] (and repeat).
+            const auto desired_present = buffer_item.timestamp;
+            if (desired_present < expected_present.count() - MAX_REASONABLE_NSEC ||
+                desired_present > expected_present.count()) {
+                // This buffer is set to display in the near future, or desired_present is garbage.
+                LOG_DEBUG(Service_Nvnflinger, "nodrop desire={} expect={}", desired_present,
+                          expected_present.count());
+                break;
+            }
+
+            LOG_DEBUG(Service_Nvnflinger, "drop desire={} expect={} size={}", desired_present,
+                      expected_present.count(), core->queue.size());
+
+            if (core->StillTracking(*front)) {
+                // Front buffer is still in mSlots, so mark the slot as free
+                slots[front->slot].buffer_state = BufferState::Free;
+            }
+
+            core->queue.erase(front);
+            front = core->queue.begin();
+        }
+
+        // See if the front buffer is ready to be acquired.
+        const auto desired_present = front->timestamp;
+        if (desired_present > expected_present.count() &&
+            desired_present < expected_present.count() + MAX_REASONABLE_NSEC) {
+            LOG_DEBUG(Service_Nvnflinger, "defer desire={} expect={}", desired_present,
+                      expected_present.count());
+            return Status::PresentLater;
+        }
+
+        LOG_DEBUG(Service_Nvnflinger, "accept desire={} expect={}", desired_present,
+                  expected_present.count());
+    }
+
+    const auto slot = front->slot;
+    *out_buffer = *front;
+
+    LOG_DEBUG(Service_Nvnflinger, "acquiring slot={}", slot);
+
+    // If the buffer has previously been acquired by the consumer, set graphic_buffer to nullptr to
+    // avoid unnecessarily remapping this buffer on the consumer side.
+    if (out_buffer->acquire_called) {
+        out_buffer->graphic_buffer = nullptr;
+    }
+
+    core->queue.erase(front);
+
+    // We might have freed a slot while dropping old buffers, or the producer  may be blocked
+    // waiting for the number of buffers in the queue to decrease.
+    core->SignalDequeueCondition();
+
+    return Status::NoError;
+}
+
+Status BufferQueueConsumer::ReleaseBuffer(s32 slot, u64 frame_number, const Fence& release_fence) {
+    if (slot < 0 || slot >= BufferQueueDefs::NUM_BUFFER_SLOTS) {
+        LOG_ERROR(Service_Nvnflinger, "slot {} out of range", slot);
+        return Status::BadValue;
+    }
+
+    std::shared_ptr<IProducerListener> listener;
+    {
+        std::scoped_lock lock{core->mutex};
+
+        // If the frame number has changed because the buffer has been reallocated, we can ignore
+        // this ReleaseBuffer for the old buffer.
+        if (frame_number != slots[slot].frame_number) {
+            return Status::StaleBufferSlot;
+        }
+
+        // Make sure this buffer hasn't been queued while acquired by the consumer.
+        auto current(core->queue.begin());
+        while (current != core->queue.end()) {
+            if (current->slot == slot) {
+                LOG_ERROR(Service_Nvnflinger, "buffer slot {} pending release is currently queued",
+                          slot);
+                return Status::BadValue;
+            }
+            ++current;
+        }
+
+        slots[slot].buffer_state = BufferState::Free;
+
+        nvmap.FreeHandle(slots[slot].graphic_buffer->BufferId(), true);
+
+        listener = core->connected_producer_listener;
+
+        LOG_DEBUG(Service_Nvnflinger, "releasing slot {}", slot);
+
+        core->SignalDequeueCondition();
+    }
+
+    // Call back without lock held
+    if (listener != nullptr) {
+        listener->OnBufferReleased();
+    }
+
+    return Status::NoError;
+}
+
+Status BufferQueueConsumer::Connect(std::shared_ptr<IConsumerListener> consumer_listener,
+                                    bool controlled_by_app) {
+    if (consumer_listener == nullptr) {
+        LOG_ERROR(Service_Nvnflinger, "consumer_listener may not be nullptr");
+        return Status::BadValue;
+    }
+
+    LOG_DEBUG(Service_Nvnflinger, "controlled_by_app={}", controlled_by_app);
+
+    std::scoped_lock lock{core->mutex};
+
+    if (core->is_abandoned) {
+        LOG_ERROR(Service_Nvnflinger, "BufferQueue has been abandoned");
+        return Status::NoInit;
+    }
+
+    core->consumer_listener = std::move(consumer_listener);
+    core->consumer_controlled_by_app = controlled_by_app;
+
+    return Status::NoError;
+}
+
+Status BufferQueueConsumer::GetReleasedBuffers(u64* out_slot_mask) {
+    if (out_slot_mask == nullptr) {
+        LOG_ERROR(Service_Nvnflinger, "out_slot_mask may not be nullptr");
+        return Status::BadValue;
+    }
+
+    std::scoped_lock lock{core->mutex};
+
+    if (core->is_abandoned) {
+        LOG_ERROR(Service_Nvnflinger, "BufferQueue has been abandoned");
+        return Status::NoInit;
+    }
+
+    u64 mask = 0;
+    for (int s = 0; s < BufferQueueDefs::NUM_BUFFER_SLOTS; ++s) {
+        if (!slots[s].acquire_called) {
+            mask |= (1ULL << s);
+        }
+    }
+
+    // Remove from the mask queued buffers for which acquire has been called, since the consumer
+    // will not receive their buffer addresses and so must retain their cached information
+    auto current(core->queue.begin());
+    while (current != core->queue.end()) {
+        if (current->acquire_called) {
+            mask &= ~(1ULL << current->slot);
+        }
+        ++current;
+    }
+
+    LOG_DEBUG(Service_Nvnflinger, "returning mask {}", mask);
+    *out_slot_mask = mask;
+    return Status::NoError;
+}
+
+} // namespace Service::android

src/core/hle/service/nvnflinger/buffer_queue_consumer.h

@@ -0,0 +1,43 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2014 The Android Open Source Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Parts of this implementation were based on:
+// https://cs.android.com/android/platform/superproject/+/android-5.1.1_r38:frameworks/native/include/gui/BufferQueueConsumer.h
+
+#pragma once
+
+#include <chrono>
+#include <memory>
+
+#include "common/common_types.h"
+#include "core/hle/service/nvnflinger/buffer_queue_defs.h"
+#include "core/hle/service/nvnflinger/status.h"
+
+namespace Service::Nvidia::NvCore {
+class NvMap;
+} // namespace Service::Nvidia::NvCore
+
+namespace Service::android {
+
+class BufferItem;
+class BufferQueueCore;
+class IConsumerListener;
+
+class BufferQueueConsumer final {
+public:
+    explicit BufferQueueConsumer(std::shared_ptr<BufferQueueCore> core_,
+                                 Service::Nvidia::NvCore::NvMap& nvmap_);
+    ~BufferQueueConsumer();
+
+    Status AcquireBuffer(BufferItem* out_buffer, std::chrono::nanoseconds expected_present);
+    Status ReleaseBuffer(s32 slot, u64 frame_number, const Fence& release_fence);
+    Status Connect(std::shared_ptr<IConsumerListener> consumer_listener, bool controlled_by_app);
+    Status GetReleasedBuffers(u64* out_slot_mask);
+
+private:
+    std::shared_ptr<BufferQueueCore> core;
+    BufferQueueDefs::SlotsType& slots;
+    Service::Nvidia::NvCore::NvMap& nvmap;
+};
+
+} // namespace Service::android

src/core/hle/service/nvnflinger/buffer_queue_core.cpp

@@ -0,0 +1,115 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2014 The Android Open Source Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Parts of this implementation were based on:
+// https://cs.android.com/android/platform/superproject/+/android-5.1.1_r38:frameworks/native/libs/gui/BufferQueueCore.cpp
+
+#include "common/assert.h"
+
+#include "core/hle/service/nvnflinger/buffer_queue_core.h"
+
+namespace Service::android {
+
+BufferQueueCore::BufferQueueCore() = default;
+
+BufferQueueCore::~BufferQueueCore() = default;
+
+void BufferQueueCore::NotifyShutdown() {
+    std::scoped_lock lock{mutex};
+
+    is_shutting_down = true;
+
+    SignalDequeueCondition();
+}
+
+void BufferQueueCore::SignalDequeueCondition() {
+    dequeue_possible.store(true);
+    dequeue_condition.notify_all();
+}
+
+bool BufferQueueCore::WaitForDequeueCondition(std::unique_lock<std::mutex>& lk) {
+    if (is_shutting_down) {
+        return false;
+    }
+
+    dequeue_condition.wait(lk, [&] { return dequeue_possible.load(); });
+    dequeue_possible.store(false);
+
+    return true;
+}
+
+s32 BufferQueueCore::GetMinUndequeuedBufferCountLocked(bool async) const {
+    // If DequeueBuffer is allowed to error out, we don't have to add an extra buffer.
+    if (!use_async_buffer) {
+        return max_acquired_buffer_count;
+    }
+
+    if (dequeue_buffer_cannot_block || async) {
+        return max_acquired_buffer_count + 1;
+    }
+
+    return max_acquired_buffer_count;
+}
+
+s32 BufferQueueCore::GetMinMaxBufferCountLocked(bool async) const {
+    return GetMinUndequeuedBufferCountLocked(async) + 1;
+}
+
+s32 BufferQueueCore::GetMaxBufferCountLocked(bool async) const {
+    const auto min_buffer_count = GetMinMaxBufferCountLocked(async);
+    auto max_buffer_count = std::max(default_max_buffer_count, min_buffer_count);
+
+    if (override_max_buffer_count != 0) {
+        ASSERT(override_max_buffer_count >= min_buffer_count);
+        max_buffer_count = override_max_buffer_count;
+    }
+
+    // Any buffers that are dequeued by the producer or sitting in the queue waiting to be consumed
+    // need to have their slots preserved.
+    for (s32 slot = max_buffer_count; slot < BufferQueueDefs::NUM_BUFFER_SLOTS; ++slot) {
+        const auto state = slots[slot].buffer_state;
+        if (state == BufferState::Queued || state == BufferState::Dequeued) {
+            max_buffer_count = slot + 1;
+        }
+    }
+
+    return max_buffer_count;
+}
+
+s32 BufferQueueCore::GetPreallocatedBufferCountLocked() const {
+    return static_cast<s32>(std::count_if(slots.begin(), slots.end(),
+                                          [](const auto& slot) { return slot.is_preallocated; }));
+}
+
+void BufferQueueCore::FreeBufferLocked(s32 slot) {
+    LOG_DEBUG(Service_Nvnflinger, "slot {}", slot);
+
+    slots[slot].graphic_buffer.reset();
+
+    slots[slot].buffer_state = BufferState::Free;
+    slots[slot].frame_number = UINT32_MAX;
+    slots[slot].acquire_called = false;
+    slots[slot].fence = Fence::NoFence();
+}
+
+void BufferQueueCore::FreeAllBuffersLocked() {
+    buffer_has_been_queued = false;
+
+    for (s32 slot = 0; slot < BufferQueueDefs::NUM_BUFFER_SLOTS; ++slot) {
+        FreeBufferLocked(slot);
+    }
+}
+
+bool BufferQueueCore::StillTracking(const BufferItem& item) const {
+    const BufferSlot& slot = slots[item.slot];
+
+    return (slot.graphic_buffer != nullptr) && (item.graphic_buffer == slot.graphic_buffer);
+}
+
+void BufferQueueCore::WaitWhileAllocatingLocked() const {
+    while (is_allocating) {
+        is_allocating_condition.wait(mutex);
+    }
+}
+
+} // namespace Service::android

src/core/hle/service/nvnflinger/buffer_queue_core.h

@@ -0,0 +1,80 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2014 The Android Open Source Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Parts of this implementation were based on:
+// https://cs.android.com/android/platform/superproject/+/android-5.1.1_r38:frameworks/native/include/gui/BufferQueueCore.h
+
+#pragma once
+
+#include <condition_variable>
+#include <list>
+#include <memory>
+#include <mutex>
+#include <set>
+#include <vector>
+
+#include "core/hle/service/nvnflinger/buffer_item.h"
+#include "core/hle/service/nvnflinger/buffer_queue_defs.h"
+#include "core/hle/service/nvnflinger/pixel_format.h"
+#include "core/hle/service/nvnflinger/status.h"
+#include "core/hle/service/nvnflinger/window.h"
+
+namespace Service::android {
+
+class IConsumerListener;
+class IProducerListener;
+
+class BufferQueueCore final {
+    friend class BufferQueueProducer;
+    friend class BufferQueueConsumer;
+
+public:
+    static constexpr s32 INVALID_BUFFER_SLOT = BufferItem::INVALID_BUFFER_SLOT;
+
+    BufferQueueCore();
+    ~BufferQueueCore();
+
+    void NotifyShutdown();
+
+private:
+    void SignalDequeueCondition();
+    bool WaitForDequeueCondition(std::unique_lock<std::mutex>& lk);
+
+    s32 GetMinUndequeuedBufferCountLocked(bool async) const;
+    s32 GetMinMaxBufferCountLocked(bool async) const;
+    s32 GetMaxBufferCountLocked(bool async) const;
+    s32 GetPreallocatedBufferCountLocked() const;
+    void FreeBufferLocked(s32 slot);
+    void FreeAllBuffersLocked();
+    bool StillTracking(const BufferItem& item) const;
+    void WaitWhileAllocatingLocked() const;
+
+private:
+    mutable std::mutex mutex;
+    bool is_abandoned{};
+    bool consumer_controlled_by_app{};
+    std::shared_ptr<IConsumerListener> consumer_listener;
+    u32 consumer_usage_bit{};
+    NativeWindowApi connected_api{NativeWindowApi::NoConnectedApi};
+    std::shared_ptr<IProducerListener> connected_producer_listener;
+    BufferQueueDefs::SlotsType slots{};
+    std::vector<BufferItem> queue;
+    s32 override_max_buffer_count{};
+    std::condition_variable dequeue_condition;
+    std::atomic<bool> dequeue_possible{};
+    const bool use_async_buffer{}; // This is always disabled on HOS
+    bool dequeue_buffer_cannot_block{};
+    PixelFormat default_buffer_format{PixelFormat::Rgba8888};
+    u32 default_width{1};
+    u32 default_height{1};
+    s32 default_max_buffer_count{2};
+    const s32 max_acquired_buffer_count{}; // This is always zero on HOS
+    bool buffer_has_been_queued{};
+    u64 frame_counter{};
+    u32 transform_hint{};
+    bool is_allocating{};
+    mutable std::condition_variable_any is_allocating_condition;
+    bool is_shutting_down{};
+};
+
+} // namespace Service::android

src/core/hle/service/nvnflinger/buffer_queue_defs.h

@@ -0,0 +1,21 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2014 The Android Open Source Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Parts of this implementation were based on:
+// https://cs.android.com/android/platform/superproject/+/android-5.1.1_r38:frameworks/native/include/gui/BufferQueueDefs.h
+
+#pragma once
+
+#include <array>
+
+#include "common/common_types.h"
+#include "core/hle/service/nvnflinger/buffer_slot.h"
+
+namespace Service::android::BufferQueueDefs {
+
+// BufferQueue will keep track of at most this value of buffers.
+constexpr s32 NUM_BUFFER_SLOTS = 64;
+
+using SlotsType = std::array<BufferSlot, NUM_BUFFER_SLOTS>;
+
+} // namespace Service::android::BufferQueueDefs

src/core/hle/service/nvnflinger/buffer_queue_producer.cpp

@@ -0,0 +1,933 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2014 The Android Open Source Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Parts of this implementation were based on:
+// https://cs.android.com/android/platform/superproject/+/android-5.1.1_r38:frameworks/native/libs/gui/BufferQueueProducer.cpp
+
+#include "common/assert.h"
+#include "common/logging/log.h"
+#include "common/settings.h"
+#include "core/core.h"
+#include "core/hle/kernel/k_event.h"
+#include "core/hle/kernel/k_readable_event.h"
+#include "core/hle/kernel/kernel.h"
+#include "core/hle/service/hle_ipc.h"
+#include "core/hle/service/kernel_helpers.h"
+#include "core/hle/service/nvdrv/core/nvmap.h"
+#include "core/hle/service/nvnflinger/buffer_queue_core.h"
+#include "core/hle/service/nvnflinger/buffer_queue_producer.h"
+#include "core/hle/service/nvnflinger/consumer_listener.h"
+#include "core/hle/service/nvnflinger/parcel.h"
+#include "core/hle/service/nvnflinger/ui/graphic_buffer.h"
+#include "core/hle/service/nvnflinger/window.h"
+#include "core/hle/service/vi/vi.h"
+
+namespace Service::android {
+
+BufferQueueProducer::BufferQueueProducer(Service::KernelHelpers::ServiceContext& service_context_,
+                                         std::shared_ptr<BufferQueueCore> buffer_queue_core_,
+                                         Service::Nvidia::NvCore::NvMap& nvmap_)
+    : service_context{service_context_}, core{std::move(buffer_queue_core_)}, slots(core->slots),
+      nvmap(nvmap_) {
+    buffer_wait_event = service_context.CreateEvent("BufferQueue:WaitEvent");
+}
+
+BufferQueueProducer::~BufferQueueProducer() {
+    service_context.CloseEvent(buffer_wait_event);
+}
+
+Status BufferQueueProducer::RequestBuffer(s32 slot, std::shared_ptr<GraphicBuffer>* buf) {
+    LOG_DEBUG(Service_Nvnflinger, "slot {}", slot);
+
+    std::scoped_lock lock{core->mutex};
+
+    if (core->is_abandoned) {
+        LOG_ERROR(Service_Nvnflinger, "BufferQueue has been abandoned");
+        return Status::NoInit;
+    }
+    if (slot < 0 || slot >= BufferQueueDefs::NUM_BUFFER_SLOTS) {
+        LOG_ERROR(Service_Nvnflinger, "slot index {} out of range [0, {})", slot,
+                  BufferQueueDefs::NUM_BUFFER_SLOTS);
+        return Status::BadValue;
+    } else if (slots[slot].buffer_state != BufferState::Dequeued) {
+        LOG_ERROR(Service_Nvnflinger, "slot {} is not owned by the producer (state = {})", slot,
+                  slots[slot].buffer_state);
+        return Status::BadValue;
+    }
+
+    slots[slot].request_buffer_called = true;
+    *buf = slots[slot].graphic_buffer;
+
+    return Status::NoError;
+}
+
+Status BufferQueueProducer::SetBufferCount(s32 buffer_count) {
+    LOG_DEBUG(Service_Nvnflinger, "count = {}", buffer_count);
+
+    std::shared_ptr<IConsumerListener> listener;
+    {
+        std::scoped_lock lock{core->mutex};
+        core->WaitWhileAllocatingLocked();
+
+        if (core->is_abandoned) {
+            LOG_ERROR(Service_Nvnflinger, "BufferQueue has been abandoned");
+            return Status::NoInit;
+        }
+
+        if (buffer_count > BufferQueueDefs::NUM_BUFFER_SLOTS) {
+            LOG_ERROR(Service_Nvnflinger, "buffer_count {} too large (max {})", buffer_count,
+                      BufferQueueDefs::NUM_BUFFER_SLOTS);
+            return Status::BadValue;
+        }
+
+        // There must be no dequeued buffers when changing the buffer count.
+        for (s32 s{}; s < BufferQueueDefs::NUM_BUFFER_SLOTS; ++s) {
+            if (slots[s].buffer_state == BufferState::Dequeued) {
+                LOG_ERROR(Service_Nvnflinger, "buffer owned by producer");
+                return Status::BadValue;
+            }
+        }
+
+        if (buffer_count == 0) {
+            core->override_max_buffer_count = 0;
+            core->SignalDequeueCondition();
+            return Status::NoError;
+        }
+
+        const s32 min_buffer_slots = core->GetMinMaxBufferCountLocked(false);
+        if (buffer_count < min_buffer_slots) {
+            LOG_ERROR(Service_Nvnflinger, "requested buffer count {} is less than minimum {}",
+                      buffer_count, min_buffer_slots);
+            return Status::BadValue;
+        }
+
+        // Here we are guaranteed that the producer doesn't have any dequeued buffers and will
+        // release all of its buffer references.
+        if (core->GetPreallocatedBufferCountLocked() <= 0) {
+            core->FreeAllBuffersLocked();
+        }
+
+        core->override_max_buffer_count = buffer_count;
+        core->SignalDequeueCondition();
+        buffer_wait_event->Signal();
+        listener = core->consumer_listener;
+    }
+
+    // Call back without lock held
+    if (listener != nullptr) {
+        listener->OnBuffersReleased();
+    }
+
+    return Status::NoError;
+}
+
+Status BufferQueueProducer::WaitForFreeSlotThenRelock(bool async, s32* found, Status* return_flags,
+                                                      std::unique_lock<std::mutex>& lk) const {
+    bool try_again = true;
+
+    while (try_again) {
+        if (core->is_abandoned) {
+            LOG_ERROR(Service_Nvnflinger, "BufferQueue has been abandoned");
+            return Status::NoInit;
+        }
+
+        const s32 max_buffer_count = core->GetMaxBufferCountLocked(async);
+        if (async && core->override_max_buffer_count) {
+            if (core->override_max_buffer_count < max_buffer_count) {
+                LOG_ERROR(Service_Nvnflinger, "async mode is invalid with buffer count override");
+                return Status::BadValue;
+            }
+        }
+
+        // Free up any buffers that are in slots beyond the max buffer count
+        for (s32 s = max_buffer_count; s < BufferQueueDefs::NUM_BUFFER_SLOTS; ++s) {
+            ASSERT(slots[s].buffer_state == BufferState::Free);
+            if (slots[s].graphic_buffer != nullptr) {
+                core->FreeBufferLocked(s);
+                *return_flags |= Status::ReleaseAllBuffers;
+            }
+        }
+
+        // Look for a free buffer to give to the client
+        *found = BufferQueueCore::INVALID_BUFFER_SLOT;
+        s32 dequeued_count{};
+        s32 acquired_count{};
+        for (s32 s{}; s < max_buffer_count; ++s) {
+            switch (slots[s].buffer_state) {
+            case BufferState::Dequeued:
+                ++dequeued_count;
+                break;
+            case BufferState::Acquired:
+                ++acquired_count;
+                break;
+            case BufferState::Free:
+                // We return the oldest of the free buffers to avoid stalling the producer if
+                // possible, since the consumer may still have pending reads of in-flight buffers
+                if (*found == BufferQueueCore::INVALID_BUFFER_SLOT ||
+                    slots[s].frame_number < slots[*found].frame_number) {
+                    *found = s;
+                }
+                break;
+            default:
+                break;
+            }
+        }
+
+        // Producers are not allowed to dequeue more than one buffer if they did not set a buffer
+        // count
+        if (!core->override_max_buffer_count && dequeued_count) {
+            LOG_ERROR(Service_Nvnflinger,
+                      "can't dequeue multiple buffers without setting the buffer count");
+            return Status::InvalidOperation;
+        }
+
+        // See whether a buffer has been queued since the last SetBufferCount so we know whether to
+        // perform the min undequeued buffers check below
+        if (core->buffer_has_been_queued) {
+            // Make sure the producer is not trying to dequeue more buffers than allowed
+            const s32 new_undequeued_count = max_buffer_count - (dequeued_count + 1);
+            const s32 min_undequeued_count = core->GetMinUndequeuedBufferCountLocked(async);
+            if (new_undequeued_count < min_undequeued_count) {
+                LOG_ERROR(Service_Nvnflinger,
+                          "min undequeued buffer count({}) exceeded (dequeued={} undequeued={})",
+                          min_undequeued_count, dequeued_count, new_undequeued_count);
+                return Status::InvalidOperation;
+            }
+        }
+
+        // If we disconnect and reconnect quickly, we can be in a state where our slots are empty
+        // but we have many buffers in the queue. This can cause us to run out of memory if we
+        // outrun the consumer. Wait here if it looks like we have too many buffers queued up.
+        const bool too_many_buffers = core->queue.size() > static_cast<size_t>(max_buffer_count);
+        if (too_many_buffers) {
+            LOG_ERROR(Service_Nvnflinger, "queue size is {}, waiting", core->queue.size());
+        }
+
+        // If no buffer is found, or if the queue has too many buffers outstanding, wait for a
+        // buffer to be acquired or released, or for the max buffer count to change.
+        try_again = (*found == BufferQueueCore::INVALID_BUFFER_SLOT) || too_many_buffers;
+        if (try_again) {
+            // Return an error if we're in non-blocking mode (producer and consumer are controlled
+            // by the application).
+            if (core->dequeue_buffer_cannot_block &&
+                (acquired_count <= core->max_acquired_buffer_count)) {
+                return Status::WouldBlock;
+            }
+
+            if (!core->WaitForDequeueCondition(lk)) {
+                // We are no longer running
+                return Status::NoError;
+            }
+        }
+    }
+
+    return Status::NoError;
+}
+
+Status BufferQueueProducer::DequeueBuffer(s32* out_slot, Fence* out_fence, bool async, u32 width,
+                                          u32 height, PixelFormat format, u32 usage) {
+    LOG_DEBUG(Service_Nvnflinger, "async={} w={} h={} format={}, usage={}",
+              async ? "true" : "false", width, height, format, usage);
+
+    if ((width != 0 && height == 0) || (width == 0 && height != 0)) {
+        LOG_ERROR(Service_Nvnflinger, "invalid size: w={} h={}", width, height);
+        return Status::BadValue;
+    }
+
+    Status return_flags = Status::NoError;
+    bool attached_by_consumer = false;
+    {
+        std::unique_lock lock{core->mutex};
+        core->WaitWhileAllocatingLocked();
+
+        if (format == PixelFormat::NoFormat) {
+            format = core->default_buffer_format;
+        }
+
+        // Enable the usage bits the consumer requested
+        usage |= core->consumer_usage_bit;
+
+        s32 found{};
+        Status status = WaitForFreeSlotThenRelock(async, &found, &return_flags, lock);
+        if (status != Status::NoError) {
+            return status;
+        }
+
+        // This should not happen
+        if (found == BufferQueueCore::INVALID_BUFFER_SLOT) {
+            LOG_ERROR(Service_Nvnflinger, "no available buffer slots");
+            return Status::Busy;
+        }
+
+        *out_slot = found;
+
+        attached_by_consumer = slots[found].attached_by_consumer;
+
+        const bool use_default_size = !width && !height;
+        if (use_default_size) {
+            width = core->default_width;
+            height = core->default_height;
+        }
+
+        slots[found].buffer_state = BufferState::Dequeued;
+
+        const std::shared_ptr<GraphicBuffer>& buffer(slots[found].graphic_buffer);
+        if ((buffer == nullptr) || (buffer->Width() != width) || (buffer->Height() != height) ||
+            (buffer->Format() != format) || ((buffer->Usage() & usage) != usage)) {
+            slots[found].acquire_called = false;
+            slots[found].graphic_buffer = nullptr;
+            slots[found].request_buffer_called = false;
+            slots[found].fence = Fence::NoFence();
+
+            return_flags |= Status::BufferNeedsReallocation;
+        }
+
+        *out_fence = slots[found].fence;
+        slots[found].fence = Fence::NoFence();
+    }
+
+    if ((return_flags & Status::BufferNeedsReallocation) != Status::None) {
+        LOG_DEBUG(Service_Nvnflinger, "allocating a new buffer for slot {}", *out_slot);
+
+        auto graphic_buffer = std::make_shared<GraphicBuffer>(width, height, format, usage);
+        if (graphic_buffer == nullptr) {
+            LOG_ERROR(Service_Nvnflinger, "creating GraphicBuffer failed");
+            return Status::NoMemory;
+        }
+
+        {
+            std::scoped_lock lock{core->mutex};
+
+            if (core->is_abandoned) {
+                LOG_ERROR(Service_Nvnflinger, "BufferQueue has been abandoned");
+                return Status::NoInit;
+            }
+
+            slots[*out_slot].frame_number = UINT32_MAX;
+            slots[*out_slot].graphic_buffer = graphic_buffer;
+        }
+    }
+
+    if (attached_by_consumer) {
+        return_flags |= Status::BufferNeedsReallocation;
+    }
+
+    LOG_DEBUG(Service_Nvnflinger, "returning slot={} frame={}, flags={}", *out_slot,
+              slots[*out_slot].frame_number, return_flags);
+
+    return return_flags;
+}
+
+Status BufferQueueProducer::DetachBuffer(s32 slot) {
+    LOG_DEBUG(Service_Nvnflinger, "slot {}", slot);
+
+    std::scoped_lock lock{core->mutex};
+
+    if (core->is_abandoned) {
+        LOG_ERROR(Service_Nvnflinger, "BufferQueue has been abandoned");
+        return Status::NoInit;
+    }
+
+    if (slot < 0 || slot >= BufferQueueDefs::NUM_BUFFER_SLOTS) {
+        LOG_ERROR(Service_Nvnflinger, "slot {} out of range [0, {})", slot,
+                  BufferQueueDefs::NUM_BUFFER_SLOTS);
+        return Status::BadValue;
+    } else if (slots[slot].buffer_state != BufferState::Dequeued) {
+        LOG_ERROR(Service_Nvnflinger, "slot {} is not owned by the producer (state = {})", slot,
+                  slots[slot].buffer_state);
+        return Status::BadValue;
+    } else if (!slots[slot].request_buffer_called) {
+        LOG_ERROR(Service_Nvnflinger, "buffer in slot {} has not been requested", slot);
+        return Status::BadValue;
+    }
+
+    core->FreeBufferLocked(slot);
+    core->SignalDequeueCondition();
+
+    return Status::NoError;
+}
+
+Status BufferQueueProducer::DetachNextBuffer(std::shared_ptr<GraphicBuffer>* out_buffer,
+                                             Fence* out_fence) {
+    if (out_buffer == nullptr) {
+        LOG_ERROR(Service_Nvnflinger, "out_buffer must not be nullptr");
+        return Status::BadValue;
+    } else if (out_fence == nullptr) {
+        LOG_ERROR(Service_Nvnflinger, "out_fence must not be nullptr");
+        return Status::BadValue;
+    }
+
+    std::scoped_lock lock{core->mutex};
+    core->WaitWhileAllocatingLocked();
+
+    if (core->is_abandoned) {
+        LOG_ERROR(Service_Nvnflinger, "BufferQueue has been abandoned");
+        return Status::NoInit;
+    }
+
+    // Find the oldest valid slot
+    int found = BufferQueueCore::INVALID_BUFFER_SLOT;
+    for (int s = 0; s < BufferQueueDefs::NUM_BUFFER_SLOTS; ++s) {
+        if (slots[s].buffer_state == BufferState::Free && slots[s].graphic_buffer != nullptr) {
+            if (found == BufferQueueCore::INVALID_BUFFER_SLOT ||
+                slots[s].frame_number < slots[found].frame_number) {
+                found = s;
+            }
+        }
+    }
+
+    if (found == BufferQueueCore::INVALID_BUFFER_SLOT) {
+        return Status::NoMemory;
+    }
+
+    LOG_DEBUG(Service_Nvnflinger, "Detached slot {}", found);
+
+    *out_buffer = slots[found].graphic_buffer;
+    *out_fence = slots[found].fence;
+
+    core->FreeBufferLocked(found);
+
+    return Status::NoError;
+}
+
+Status BufferQueueProducer::AttachBuffer(s32* out_slot,
+                                         const std::shared_ptr<GraphicBuffer>& buffer) {
+    if (out_slot == nullptr) {
+        LOG_ERROR(Service_Nvnflinger, "out_slot must not be nullptr");
+        return Status::BadValue;
+    } else if (buffer == nullptr) {
+        LOG_ERROR(Service_Nvnflinger, "Cannot attach nullptr buffer");
+        return Status::BadValue;
+    }
+
+    std::unique_lock lock{core->mutex};
+    core->WaitWhileAllocatingLocked();
+
+    Status return_flags = Status::NoError;
+    s32 found{};
+
+    const auto status = WaitForFreeSlotThenRelock(false, &found, &return_flags, lock);
+    if (status != Status::NoError) {
+        return status;
+    }
+
+    // This should not happen
+    if (found == BufferQueueCore::INVALID_BUFFER_SLOT) {
+        LOG_ERROR(Service_Nvnflinger, "No available buffer slots");
+        return Status::Busy;
+    }
+
+    *out_slot = found;
+
+    LOG_DEBUG(Service_Nvnflinger, "Returning slot {} flags={}", *out_slot, return_flags);
+
+    slots[*out_slot].graphic_buffer = buffer;
+    slots[*out_slot].buffer_state = BufferState::Dequeued;
+    slots[*out_slot].fence = Fence::NoFence();
+    slots[*out_slot].request_buffer_called = true;
+
+    return return_flags;
+}
+
+Status BufferQueueProducer::QueueBuffer(s32 slot, const QueueBufferInput& input,
+                                        QueueBufferOutput* output) {
+    s64 timestamp{};
+    bool is_auto_timestamp{};
+    Common::Rectangle<s32> crop;
+    NativeWindowScalingMode scaling_mode{};
+    NativeWindowTransform transform;
+    u32 sticky_transform_{};
+    bool async{};
+    s32 swap_interval{};
+    Fence fence{};
+
+    input.Deflate(&timestamp, &is_auto_timestamp, &crop, &scaling_mode, &transform,
+                  &sticky_transform_, &async, &swap_interval, &fence);
+
+    switch (scaling_mode) {
+    case NativeWindowScalingMode::Freeze:
+    case NativeWindowScalingMode::ScaleToWindow:
+    case NativeWindowScalingMode::ScaleCrop:
+    case NativeWindowScalingMode::NoScaleCrop:
+        break;
+    default:
+        LOG_ERROR(Service_Nvnflinger, "unknown scaling mode {}", scaling_mode);
+        return Status::BadValue;
+    }
+
+    std::shared_ptr<IConsumerListener> frame_available_listener;
+    std::shared_ptr<IConsumerListener> frame_replaced_listener;
+    s32 callback_ticket{};
+    BufferItem item;
+
+    {
+        std::scoped_lock lock{core->mutex};
+
+        if (core->is_abandoned) {
+            LOG_ERROR(Service_Nvnflinger, "BufferQueue has been abandoned");
+            return Status::NoInit;
+        }
+
+        const s32 max_buffer_count = core->GetMaxBufferCountLocked(async);
+        if (async && core->override_max_buffer_count) {
+            if (core->override_max_buffer_count < max_buffer_count) {
+                LOG_ERROR(Service_Nvnflinger, "async mode is invalid with "
+                                              "buffer count override");
+                return Status::BadValue;
+            }
+        }
+
+        if (slot < 0 || slot >= max_buffer_count) {
+            LOG_ERROR(Service_Nvnflinger, "slot index {} out of range [0, {})", slot,
+                      max_buffer_count);
+            return Status::BadValue;
+        } else if (slots[slot].buffer_state != BufferState::Dequeued) {
+            LOG_ERROR(Service_Nvnflinger,
+                      "slot {} is not owned by the producer "
+                      "(state = {})",
+                      slot, slots[slot].buffer_state);
+            return Status::BadValue;
+        } else if (!slots[slot].request_buffer_called) {
+            LOG_ERROR(Service_Nvnflinger,
+                      "slot {} was queued without requesting "
+                      "a buffer",
+                      slot);
+            return Status::BadValue;
+        }
+
+        LOG_DEBUG(Service_Nvnflinger,
+                  "slot={} frame={} time={} crop=[{},{},{},{}] transform={} scale={}", slot,
+                  core->frame_counter + 1, timestamp, crop.Left(), crop.Top(), crop.Right(),
+                  crop.Bottom(), transform, scaling_mode);
+
+        const std::shared_ptr<GraphicBuffer>& graphic_buffer(slots[slot].graphic_buffer);
+        Common::Rectangle<s32> buffer_rect(graphic_buffer->Width(), graphic_buffer->Height());
+        Common::Rectangle<s32> cropped_rect;
+        [[maybe_unused]] const bool unused = crop.Intersect(buffer_rect, &cropped_rect);
+
+        if (cropped_rect != crop) {
+            LOG_ERROR(Service_Nvnflinger, "crop rect is not contained within the buffer in slot {}",
+                      slot);
+            return Status::BadValue;
+        }
+
+        slots[slot].fence = fence;
+        slots[slot].buffer_state = BufferState::Queued;
+        ++core->frame_counter;
+        slots[slot].frame_number = core->frame_counter;
+
+        item.acquire_called = slots[slot].acquire_called;
+        item.graphic_buffer = slots[slot].graphic_buffer;
+        item.crop = crop;
+        item.transform = transform & ~NativeWindowTransform::InverseDisplay;
+        item.transform_to_display_inverse =
+            (transform & NativeWindowTransform::InverseDisplay) != NativeWindowTransform::None;
+        item.scaling_mode = static_cast<u32>(scaling_mode);
+        item.timestamp = timestamp;
+        item.is_auto_timestamp = is_auto_timestamp;
+        item.frame_number = core->frame_counter;
+        item.slot = slot;
+        item.fence = fence;
+        item.is_droppable = core->dequeue_buffer_cannot_block || async;
+        item.swap_interval = swap_interval;
+
+        nvmap.DuplicateHandle(item.graphic_buffer->BufferId(), true);
+
+        sticky_transform = sticky_transform_;
+
+        if (core->queue.empty()) {
+            // When the queue is empty, we can simply queue this buffer
+            core->queue.push_back(item);
+            frame_available_listener = core->consumer_listener;
+        } else {
+            // When the queue is not empty, we need to look at the front buffer
+            // state to see if we need to replace it
+            auto front(core->queue.begin());
+
+            if (front->is_droppable) {
+                // If the front queued buffer is still being tracked, we first
+                // mark it as freed
+                if (core->StillTracking(*front)) {
+                    slots[front->slot].buffer_state = BufferState::Free;
+                    // Reset the frame number of the freed buffer so that it is the first in line to
+                    // be dequeued again
+                    slots[front->slot].frame_number = 0;
+                }
+                // Overwrite the droppable buffer with the incoming one
+                *front = item;
+                frame_replaced_listener = core->consumer_listener;
+            } else {
+                core->queue.push_back(item);
+                frame_available_listener = core->consumer_listener;
+            }
+        }
+
+        core->buffer_has_been_queued = true;
+        core->SignalDequeueCondition();
+        output->Inflate(core->default_width, core->default_height, core->transform_hint,
+                        static_cast<u32>(core->queue.size()));
+
+        // Take a ticket for the callback functions
+        callback_ticket = next_callback_ticket++;
+    }
+
+    // Don't send the GraphicBuffer through the callback, and don't send the slot number, since the
+    // consumer shouldn't need it
+    item.graphic_buffer.reset();
+    item.slot = BufferItem::INVALID_BUFFER_SLOT;
+
+    // Call back without the main BufferQueue lock held, but with the callback lock held so we can
+    // ensure that callbacks occur in order
+    {
+        std::scoped_lock lock{callback_mutex};
+        while (callback_ticket != current_callback_ticket) {
+            callback_condition.wait(callback_mutex);
+        }
+
+        if (frame_available_listener != nullptr) {
+            frame_available_listener->OnFrameAvailable(item);
+        } else if (frame_replaced_listener != nullptr) {
+            frame_replaced_listener->OnFrameReplaced(item);
+        }
+
+        ++current_callback_ticket;
+        callback_condition.notify_all();
+    }
+
+    return Status::NoError;
+}
+
+void BufferQueueProducer::CancelBuffer(s32 slot, const Fence& fence) {
+    LOG_DEBUG(Service_Nvnflinger, "slot {}", slot);
+
+    std::scoped_lock lock{core->mutex};
+
+    if (core->is_abandoned) {
+        LOG_ERROR(Service_Nvnflinger, "BufferQueue has been abandoned");
+        return;
+    }
+
+    if (slot < 0 || slot >= BufferQueueDefs::NUM_BUFFER_SLOTS) {
+        LOG_ERROR(Service_Nvnflinger, "slot index {} out of range [0, {})", slot,
+                  BufferQueueDefs::NUM_BUFFER_SLOTS);
+        return;
+    } else if (slots[slot].buffer_state != BufferState::Dequeued) {
+        LOG_ERROR(Service_Nvnflinger, "slot {} is not owned by the producer (state = {})", slot,
+                  slots[slot].buffer_state);
+        return;
+    }
+
+    slots[slot].buffer_state = BufferState::Free;
+    slots[slot].frame_number = 0;
+    slots[slot].fence = fence;
+
+    core->SignalDequeueCondition();
+    buffer_wait_event->Signal();
+}
+
+Status BufferQueueProducer::Query(NativeWindow what, s32* out_value) {
+    std::scoped_lock lock{core->mutex};
+
+    if (out_value == nullptr) {
+        LOG_ERROR(Service_Nvnflinger, "outValue was nullptr");
+        return Status::BadValue;
+    }
+
+    if (core->is_abandoned) {
+        LOG_ERROR(Service_Nvnflinger, "BufferQueue has been abandoned");
+        return Status::NoInit;
+    }
+
+    u32 value{};
+    switch (what) {
+    case NativeWindow::Width:
+        value = core->default_width;
+        break;
+    case NativeWindow::Height:
+        value = core->default_height;
+        break;
+    case NativeWindow::Format:
+        value = static_cast<u32>(core->default_buffer_format);
+        break;
+    case NativeWindow::MinUndequeedBuffers:
+        value = core->GetMinUndequeuedBufferCountLocked(false);
+        break;
+    case NativeWindow::StickyTransform:
+        value = sticky_transform;
+        break;
+    case NativeWindow::ConsumerRunningBehind:
+        value = (core->queue.size() > 1);
+        break;
+    case NativeWindow::ConsumerUsageBits:
+        value = core->consumer_usage_bit;
+        break;
+    default:
+        ASSERT(false);
+        return Status::BadValue;
+    }
+
+    LOG_DEBUG(Service_Nvnflinger, "what = {}, value = {}", what, value);
+
+    *out_value = static_cast<s32>(value);
+
+    return Status::NoError;
+}
+
+Status BufferQueueProducer::Connect(const std::shared_ptr<IProducerListener>& listener,
+                                    NativeWindowApi api, bool producer_controlled_by_app,
+                                    QueueBufferOutput* output) {
+    std::scoped_lock lock{core->mutex};
+
+    LOG_DEBUG(Service_Nvnflinger, "api = {} producer_controlled_by_app = {}", api,
+              producer_controlled_by_app);
+
+    if (core->is_abandoned) {
+        LOG_ERROR(Service_Nvnflinger, "BufferQueue has been abandoned");
+        return Status::NoInit;
+    }
+
+    if (core->consumer_listener == nullptr) {
+        LOG_ERROR(Service_Nvnflinger, "BufferQueue has no consumer");
+        return Status::NoInit;
+    }
+
+    if (output == nullptr) {
+        LOG_ERROR(Service_Nvnflinger, "output was nullptr");
+        return Status::BadValue;
+    }
+
+    if (core->connected_api != NativeWindowApi::NoConnectedApi) {
+        LOG_ERROR(Service_Nvnflinger, "already connected (cur = {} req = {})", core->connected_api,
+                  api);
+        return Status::BadValue;
+    }
+
+    Status status = Status::NoError;
+    switch (api) {
+    case NativeWindowApi::Egl:
+    case NativeWindowApi::Cpu:
+    case NativeWindowApi::Media:
+    case NativeWindowApi::Camera:
+        core->connected_api = api;
+        output->Inflate(core->default_width, core->default_height, core->transform_hint,
+                        static_cast<u32>(core->queue.size()));
+        core->connected_producer_listener = listener;
+        break;
+    default:
+        LOG_ERROR(Service_Nvnflinger, "unknown api = {}", api);
+        status = Status::BadValue;
+        break;
+    }
+
+    core->buffer_has_been_queued = false;
+    core->dequeue_buffer_cannot_block =
+        core->consumer_controlled_by_app && producer_controlled_by_app;
+
+    return status;
+}
+
+Status BufferQueueProducer::Disconnect(NativeWindowApi api) {
+    LOG_DEBUG(Service_Nvnflinger, "api = {}", api);
+
+    Status status = Status::NoError;
+    std::shared_ptr<IConsumerListener> listener;
+
+    {
+        std::scoped_lock lock{core->mutex};
+
+        core->WaitWhileAllocatingLocked();
+
+        if (core->is_abandoned) {
+            // Disconnecting after the surface has been abandoned is a no-op.
+            return Status::NoError;
+        }
+
+        // HACK: We are not Android. Remove handle for items in queue, and clear queue.
+        // Allows synchronous destruction of nvmap handles.
+        for (auto& item : core->queue) {
+            nvmap.FreeHandle(item.graphic_buffer->BufferId(), true);
+        }
+        core->queue.clear();
+
+        switch (api) {
+        case NativeWindowApi::Egl:
+        case NativeWindowApi::Cpu:
+        case NativeWindowApi::Media:
+        case NativeWindowApi::Camera:
+            if (core->connected_api == api) {
+                core->FreeAllBuffersLocked();
+                core->connected_producer_listener = nullptr;
+                core->connected_api = NativeWindowApi::NoConnectedApi;
+                core->SignalDequeueCondition();
+                buffer_wait_event->Signal();
+                listener = core->consumer_listener;
+            } else {
+                LOG_ERROR(Service_Nvnflinger, "still connected to another api (cur = {} req = {})",
+                          core->connected_api, api);
+                status = Status::BadValue;
+            }
+            break;
+        default:
+            LOG_ERROR(Service_Nvnflinger, "unknown api = {}", api);
+            status = Status::BadValue;
+            break;
+        }
+    }
+
+    // Call back without lock held
+    if (listener != nullptr) {
+        listener->OnBuffersReleased();
+    }
+
+    return status;
+}
+
+Status BufferQueueProducer::SetPreallocatedBuffer(s32 slot,
+                                                  const std::shared_ptr<GraphicBuffer>& buffer) {
+    LOG_DEBUG(Service_Nvnflinger, "slot {}", slot);
+
+    if (slot < 0 || slot >= BufferQueueDefs::NUM_BUFFER_SLOTS) {
+        return Status::BadValue;
+    }
+
+    std::scoped_lock lock{core->mutex};
+
+    slots[slot] = {};
+    slots[slot].graphic_buffer = buffer;
+    slots[slot].frame_number = 0;
+
+    // Most games preallocate a buffer and pass a valid buffer here. However, it is possible for
+    // this to be called with an empty buffer, Naruto Ultimate Ninja Storm is a game that does this.
+    if (buffer) {
+        slots[slot].is_preallocated = true;
+
+        core->override_max_buffer_count = core->GetPreallocatedBufferCountLocked();
+        core->default_width = buffer->Width();
+        core->default_height = buffer->Height();
+        core->default_buffer_format = buffer->Format();
+    }
+
+    core->SignalDequeueCondition();
+    buffer_wait_event->Signal();
+
+    return Status::NoError;
+}
+
+void BufferQueueProducer::Transact(HLERequestContext& ctx, TransactionId code, u32 flags) {
+    Status status{Status::NoError};
+    InputParcel parcel_in{ctx.ReadBuffer()};
+    OutputParcel parcel_out{};
+
+    switch (code) {
+    case TransactionId::Connect: {
+        const auto enable_listener = parcel_in.Read<bool>();
+        const auto api = parcel_in.Read<NativeWindowApi>();
+        const auto producer_controlled_by_app = parcel_in.Read<bool>();
+
+        UNIMPLEMENTED_IF_MSG(enable_listener, "Listener is unimplemented!");
+
+        std::shared_ptr<IProducerListener> listener;
+        QueueBufferOutput output{};
+
+        status = Connect(listener, api, producer_controlled_by_app, &output);
+
+        parcel_out.Write(output);
+        break;
+    }
+    case TransactionId::SetPreallocatedBuffer: {
+        const auto slot = parcel_in.Read<s32>();
+        const auto buffer = parcel_in.ReadObject<GraphicBuffer>();
+
+        status = SetPreallocatedBuffer(slot, buffer);
+        break;
+    }
+    case TransactionId::DequeueBuffer: {
+        const auto is_async = parcel_in.Read<bool>();
+        const auto width = parcel_in.Read<u32>();
+        const auto height = parcel_in.Read<u32>();
+        const auto pixel_format = parcel_in.Read<PixelFormat>();
+        const auto usage = parcel_in.Read<u32>();
+
+        s32 slot{};
+        Fence fence{};
+
+        status = DequeueBuffer(&slot, &fence, is_async, width, height, pixel_format, usage);
+
+        parcel_out.Write(slot);
+        parcel_out.WriteObject(&fence);
+        break;
+    }
+    case TransactionId::RequestBuffer: {
+        const auto slot = parcel_in.Read<s32>();
+
+        std::shared_ptr<GraphicBuffer> buf;
+
+        status = RequestBuffer(slot, &buf);
+
+        parcel_out.WriteObject(buf);
+        break;
+    }
+    case TransactionId::QueueBuffer: {
+        const auto slot = parcel_in.Read<s32>();
+
+        QueueBufferInput input{parcel_in};
+        QueueBufferOutput output;
+
+        status = QueueBuffer(slot, input, &output);
+
+        parcel_out.Write(output);
+        break;
+    }
+    case TransactionId::Query: {
+        const auto what = parcel_in.Read<NativeWindow>();
+
+        s32 value{};
+
+        status = Query(what, &value);
+
+        parcel_out.Write(value);
+        break;
+    }
+    case TransactionId::CancelBuffer: {
+        const auto slot = parcel_in.Read<s32>();
+        const auto fence = parcel_in.ReadFlattened<Fence>();
+
+        CancelBuffer(slot, fence);
+        break;
+    }
+    case TransactionId::Disconnect: {
+        const auto api = parcel_in.Read<NativeWindowApi>();
+
+        status = Disconnect(api);
+        break;
+    }
+    case TransactionId::DetachBuffer: {
+        const auto slot = parcel_in.Read<s32>();
+
+        status = DetachBuffer(slot);
+        break;
+    }
+    case TransactionId::SetBufferCount: {
+        const auto buffer_count = parcel_in.Read<s32>();
+
+        status = SetBufferCount(buffer_count);
+        break;
+    }
+    case TransactionId::GetBufferHistory:
+        LOG_WARNING(Service_Nvnflinger, "(STUBBED) called, transaction=GetBufferHistory");
+        break;
+    default:
+        ASSERT_MSG(false, "Unimplemented TransactionId {}", code);
+        break;
+    }
+
+    parcel_out.Write(status);
+
+    ctx.WriteBuffer(parcel_out.Serialize());
+}
+
+Kernel::KReadableEvent& BufferQueueProducer::GetNativeHandle() {
+    return buffer_wait_event->GetReadableEvent();
+}
+
+} // namespace Service::android

src/core/hle/service/nvnflinger/buffer_queue_producer.h

@@ -0,0 +1,90 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2014 The Android Open Source Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Parts of this implementation were based on:
+// https://cs.android.com/android/platform/superproject/+/android-5.1.1_r38:frameworks/native/include/gui/BufferQueueProducer.h
+
+#pragma once
+
+#include <condition_variable>
+#include <memory>
+#include <mutex>
+
+#include "common/common_funcs.h"
+#include "core/hle/service/nvdrv/nvdata.h"
+#include "core/hle/service/nvnflinger/binder.h"
+#include "core/hle/service/nvnflinger/buffer_queue_defs.h"
+#include "core/hle/service/nvnflinger/buffer_slot.h"
+#include "core/hle/service/nvnflinger/graphic_buffer_producer.h"
+#include "core/hle/service/nvnflinger/pixel_format.h"
+#include "core/hle/service/nvnflinger/status.h"
+#include "core/hle/service/nvnflinger/window.h"
+
+namespace Kernel {
+class KernelCore;
+class KEvent;
+class KReadableEvent;
+} // namespace Kernel
+
+namespace Service::KernelHelpers {
+class ServiceContext;
+} // namespace Service::KernelHelpers
+
+namespace Service::Nvidia::NvCore {
+class NvMap;
+} // namespace Service::Nvidia::NvCore
+
+namespace Service::android {
+
+class BufferQueueCore;
+class IProducerListener;
+
+class BufferQueueProducer final : public IBinder {
+public:
+    explicit BufferQueueProducer(Service::KernelHelpers::ServiceContext& service_context_,
+                                 std::shared_ptr<BufferQueueCore> buffer_queue_core_,
+                                 Service::Nvidia::NvCore::NvMap& nvmap_);
+    ~BufferQueueProducer();
+
+    void Transact(HLERequestContext& ctx, android::TransactionId code, u32 flags) override;
+
+    Kernel::KReadableEvent& GetNativeHandle() override;
+
+public:
+    Status RequestBuffer(s32 slot, std::shared_ptr<GraphicBuffer>* buf);
+    Status SetBufferCount(s32 buffer_count);
+    Status DequeueBuffer(s32* out_slot, android::Fence* out_fence, bool async, u32 width,
+                         u32 height, PixelFormat format, u32 usage);
+    Status DetachBuffer(s32 slot);
+    Status DetachNextBuffer(std::shared_ptr<GraphicBuffer>* out_buffer, Fence* out_fence);
+    Status AttachBuffer(s32* outSlot, const std::shared_ptr<GraphicBuffer>& buffer);
+    Status QueueBuffer(s32 slot, const QueueBufferInput& input, QueueBufferOutput* output);
+    void CancelBuffer(s32 slot, const Fence& fence);
+    Status Query(NativeWindow what, s32* out_value);
+    Status Connect(const std::shared_ptr<IProducerListener>& listener, NativeWindowApi api,
+                   bool producer_controlled_by_app, QueueBufferOutput* output);
+
+    Status Disconnect(NativeWindowApi api);
+    Status SetPreallocatedBuffer(s32 slot, const std::shared_ptr<GraphicBuffer>& buffer);
+
+private:
+    BufferQueueProducer(const BufferQueueProducer&) = delete;
+
+    Status WaitForFreeSlotThenRelock(bool async, s32* found, Status* return_flags,
+                                     std::unique_lock<std::mutex>& lk) const;
+
+    Kernel::KEvent* buffer_wait_event{};
+    Service::KernelHelpers::ServiceContext& service_context;
+
+    std::shared_ptr<BufferQueueCore> core;
+    BufferQueueDefs::SlotsType& slots;
+    u32 sticky_transform{};
+    std::mutex callback_mutex;
+    s32 next_callback_ticket{};
+    s32 current_callback_ticket{};
+    std::condition_variable_any callback_condition;
+
+    Service::Nvidia::NvCore::NvMap& nvmap;
+};
+
+} // namespace Service::android

src/core/hle/service/nvnflinger/buffer_slot.h

@@ -0,0 +1,38 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2014 The Android Open Source Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Parts of this implementation were based on:
+// https://cs.android.com/android/platform/superproject/+/android-5.1.1_r38:frameworks/native/include/gui/BufferSlot.h
+
+#pragma once
+
+#include <memory>
+
+#include "common/common_types.h"
+#include "core/hle/service/nvnflinger/ui/fence.h"
+
+namespace Service::android {
+
+class GraphicBuffer;
+
+enum class BufferState : u32 {
+    Free = 0,
+    Dequeued = 1,
+    Queued = 2,
+    Acquired = 3,
+};
+
+struct BufferSlot final {
+    constexpr BufferSlot() = default;
+
+    std::shared_ptr<GraphicBuffer> graphic_buffer;
+    BufferState buffer_state{BufferState::Free};
+    bool request_buffer_called{};
+    u64 frame_number{};
+    Fence fence;
+    bool acquire_called{};
+    bool attached_by_consumer{};
+    bool is_preallocated{};
+};
+
+} // namespace Service::android

src/core/hle/service/nvnflinger/buffer_transform_flags.h

@@ -0,0 +1,25 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include "common/common_types.h"
+
+namespace Service::android {
+
+enum class BufferTransformFlags : u32 {
+    /// No transform flags are set
+    Unset = 0x00,
+    /// Flip source image horizontally (around the vertical axis)
+    FlipH = 0x01,
+    /// Flip source image vertically (around the horizontal axis)
+    FlipV = 0x02,
+    /// Rotate source image 90 degrees clockwise
+    Rotate90 = 0x04,
+    /// Rotate source image 180 degrees
+    Rotate180 = 0x03,
+    /// Rotate source image 270 degrees clockwise
+    Rotate270 = 0x07,
+};
+
+} // namespace Service::android

src/core/hle/service/nvnflinger/consumer_base.cpp

@@ -0,0 +1,133 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2010 The Android Open Source Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Parts of this implementation were based on:
+// https://cs.android.com/android/platform/superproject/+/android-5.1.1_r38:frameworks/native/libs/gui/ConsumerBase.cpp
+
+#include "common/assert.h"
+#include "common/logging/log.h"
+#include "core/hle/service/nvnflinger/buffer_item.h"
+#include "core/hle/service/nvnflinger/buffer_queue_consumer.h"
+#include "core/hle/service/nvnflinger/buffer_queue_core.h"
+#include "core/hle/service/nvnflinger/consumer_base.h"
+#include "core/hle/service/nvnflinger/ui/graphic_buffer.h"
+
+namespace Service::android {
+
+ConsumerBase::ConsumerBase(std::unique_ptr<BufferQueueConsumer> consumer_)
+    : consumer{std::move(consumer_)} {}
+
+ConsumerBase::~ConsumerBase() {
+    std::scoped_lock lock{mutex};
+
+    ASSERT_MSG(is_abandoned, "consumer is not abandoned!");
+}
+
+void ConsumerBase::Connect(bool controlled_by_app) {
+    consumer->Connect(shared_from_this(), controlled_by_app);
+}
+
+void ConsumerBase::FreeBufferLocked(s32 slot_index) {
+    LOG_DEBUG(Service_Nvnflinger, "slot_index={}", slot_index);
+
+    slots[slot_index].graphic_buffer = nullptr;
+    slots[slot_index].fence = Fence::NoFence();
+    slots[slot_index].frame_number = 0;
+}
+
+void ConsumerBase::OnFrameAvailable(const BufferItem& item) {
+    LOG_DEBUG(Service_Nvnflinger, "called");
+}
+
+void ConsumerBase::OnFrameReplaced(const BufferItem& item) {
+    LOG_DEBUG(Service_Nvnflinger, "called");
+}
+
+void ConsumerBase::OnBuffersReleased() {
+    std::scoped_lock lock{mutex};
+
+    LOG_DEBUG(Service_Nvnflinger, "called");
+
+    if (is_abandoned) {
+        // Nothing to do if we're already abandoned.
+        return;
+    }
+
+    u64 mask = 0;
+    consumer->GetReleasedBuffers(&mask);
+    for (int i = 0; i < BufferQueueDefs::NUM_BUFFER_SLOTS; i++) {
+        if (mask & (1ULL << i)) {
+            FreeBufferLocked(i);
+        }
+    }
+}
+
+void ConsumerBase::OnSidebandStreamChanged() {}
+
+Status ConsumerBase::AcquireBufferLocked(BufferItem* item, std::chrono::nanoseconds present_when) {
+    Status err = consumer->AcquireBuffer(item, present_when);
+    if (err != Status::NoError) {
+        return err;
+    }
+
+    if (item->graphic_buffer != nullptr) {
+        slots[item->slot].graphic_buffer = item->graphic_buffer;
+    }
+
+    slots[item->slot].frame_number = item->frame_number;
+    slots[item->slot].fence = item->fence;
+
+    LOG_DEBUG(Service_Nvnflinger, "slot={}", item->slot);
+
+    return Status::NoError;
+}
+
+Status ConsumerBase::AddReleaseFenceLocked(s32 slot,
+                                           const std::shared_ptr<GraphicBuffer>& graphic_buffer,
+                                           const Fence& fence) {
+    LOG_DEBUG(Service_Nvnflinger, "slot={}", slot);
+
+    // If consumer no longer tracks this graphic_buffer, we can safely
+    // drop this fence, as it will never be received by the producer.
+
+    if (!StillTracking(slot, graphic_buffer)) {
+        return Status::NoError;
+    }
+
+    slots[slot].fence = fence;
+
+    return Status::NoError;
+}
+
+Status ConsumerBase::ReleaseBufferLocked(s32 slot,
+                                         const std::shared_ptr<GraphicBuffer>& graphic_buffer) {
+    // If consumer no longer tracks this graphic_buffer (we received a new
+    // buffer on the same slot), the buffer producer is definitely no longer
+    // tracking it.
+
+    if (!StillTracking(slot, graphic_buffer)) {
+        return Status::NoError;
+    }
+
+    LOG_DEBUG(Service_Nvnflinger, "slot={}", slot);
+    Status err = consumer->ReleaseBuffer(slot, slots[slot].frame_number, slots[slot].fence);
+    if (err == Status::StaleBufferSlot) {
+        FreeBufferLocked(slot);
+    }
+
+    slots[slot].fence = Fence::NoFence();
+
+    return err;
+}
+
+bool ConsumerBase::StillTracking(s32 slot,
+                                 const std::shared_ptr<GraphicBuffer>& graphic_buffer) const {
+    if (slot < 0 || slot >= BufferQueueDefs::NUM_BUFFER_SLOTS) {
+        return false;
+    }
+
+    return (slots[slot].graphic_buffer != nullptr &&
+            slots[slot].graphic_buffer->Handle() == graphic_buffer->Handle());
+}
+
+} // namespace Service::android

src/core/hle/service/nvnflinger/consumer_base.h

@@ -0,0 +1,60 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2010 The Android Open Source Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Parts of this implementation were based on:
+// https://cs.android.com/android/platform/superproject/+/android-5.1.1_r38:frameworks/native/include/gui/ConsumerBase.h
+
+#pragma once
+
+#include <array>
+#include <chrono>
+#include <memory>
+#include <mutex>
+
+#include "common/common_types.h"
+#include "core/hle/service/nvnflinger/buffer_queue_defs.h"
+#include "core/hle/service/nvnflinger/consumer_listener.h"
+#include "core/hle/service/nvnflinger/status.h"
+
+namespace Service::android {
+
+class BufferItem;
+class BufferQueueConsumer;
+
+class ConsumerBase : public IConsumerListener, public std::enable_shared_from_this<ConsumerBase> {
+public:
+    void Connect(bool controlled_by_app);
+
+protected:
+    explicit ConsumerBase(std::unique_ptr<BufferQueueConsumer> consumer_);
+    ~ConsumerBase() override;
+
+    void OnFrameAvailable(const BufferItem& item) override;
+    void OnFrameReplaced(const BufferItem& item) override;
+    void OnBuffersReleased() override;
+    void OnSidebandStreamChanged() override;
+
+    void FreeBufferLocked(s32 slot_index);
+    Status AcquireBufferLocked(BufferItem* item, std::chrono::nanoseconds present_when);
+    Status ReleaseBufferLocked(s32 slot, const std::shared_ptr<GraphicBuffer>& graphic_buffer);
+    bool StillTracking(s32 slot, const std::shared_ptr<GraphicBuffer>& graphic_buffer) const;
+    Status AddReleaseFenceLocked(s32 slot, const std::shared_ptr<GraphicBuffer>& graphic_buffer,
+                                 const Fence& fence);
+
+    struct Slot final {
+        std::shared_ptr<GraphicBuffer> graphic_buffer;
+        Fence fence;
+        u64 frame_number{};
+    };
+
+protected:
+    std::array<Slot, BufferQueueDefs::NUM_BUFFER_SLOTS> slots;
+
+    bool is_abandoned{};
+
+    std::unique_ptr<BufferQueueConsumer> consumer;
+
+    mutable std::mutex mutex;
+};
+
+} // namespace Service::android

src/core/hle/service/nvnflinger/consumer_listener.h

@@ -0,0 +1,26 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2014 The Android Open Source Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Parts of this implementation were based on:
+// https://cs.android.com/android/platform/superproject/+/android-5.1.1_r38:frameworks/native/include/gui/IConsumerListener.h
+
+#pragma once
+
+namespace Service::android {
+
+class BufferItem;
+
+/// ConsumerListener is the interface through which the BufferQueue notifies the consumer of events
+/// that the consumer may wish to react to.
+class IConsumerListener {
+public:
+    IConsumerListener() = default;
+    virtual ~IConsumerListener() = default;
+
+    virtual void OnFrameAvailable(const BufferItem& item) = 0;
+    virtual void OnFrameReplaced(const BufferItem& item) = 0;
+    virtual void OnBuffersReleased() = 0;
+    virtual void OnSidebandStreamChanged() = 0;
+};
+
+}; // namespace Service::android

src/core/hle/service/nvnflinger/graphic_buffer_producer.cpp

@@ -0,0 +1,18 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2010 The Android Open Source Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Parts of this implementation were based on:
+// https://cs.android.com/android/platform/superproject/+/android-5.1.1_r38:frameworks/native/libs/gui/IGraphicBufferProducer.cpp
+
+#include "core/hle/service/nvnflinger/graphic_buffer_producer.h"
+#include "core/hle/service/nvnflinger/parcel.h"
+
+namespace Service::android {
+
+QueueBufferInput::QueueBufferInput(InputParcel& parcel) {
+    parcel.ReadFlattened(*this);
+}
+
+QueueBufferOutput::QueueBufferOutput() = default;
+
+} // namespace Service::android

src/core/hle/service/nvnflinger/graphic_buffer_producer.h

@@ -0,0 +1,76 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2010 The Android Open Source Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Parts of this implementation were based on:
+// https://cs.android.com/android/platform/superproject/+/android-5.1.1_r38:frameworks/native/include/gui/IGraphicBufferProducer.h
+
+#pragma once
+
+#include "common/common_funcs.h"
+#include "common/common_types.h"
+#include "common/math_util.h"
+#include "core/hle/service/nvnflinger/ui/fence.h"
+#include "core/hle/service/nvnflinger/window.h"
+
+namespace Service::android {
+
+class InputParcel;
+
+#pragma pack(push, 1)
+struct QueueBufferInput final {
+    explicit QueueBufferInput(InputParcel& parcel);
+
+    void Deflate(s64* timestamp_, bool* is_auto_timestamp_, Common::Rectangle<s32>* crop_,
+                 NativeWindowScalingMode* scaling_mode_, NativeWindowTransform* transform_,
+                 u32* sticky_transform_, bool* async_, s32* swap_interval_, Fence* fence_) const {
+        *timestamp_ = timestamp;
+        *is_auto_timestamp_ = static_cast<bool>(is_auto_timestamp);
+        *crop_ = crop;
+        *scaling_mode_ = scaling_mode;
+        *transform_ = transform;
+        *sticky_transform_ = sticky_transform;
+        *async_ = static_cast<bool>(async);
+        *swap_interval_ = swap_interval;
+        *fence_ = fence;
+    }
+
+private:
+    s64 timestamp{};
+    s32 is_auto_timestamp{};
+    Common::Rectangle<s32> crop{};
+    NativeWindowScalingMode scaling_mode{};
+    NativeWindowTransform transform{};
+    u32 sticky_transform{};
+    s32 async{};
+    s32 swap_interval{};
+    Fence fence{};
+};
+#pragma pack(pop)
+static_assert(sizeof(QueueBufferInput) == 84, "QueueBufferInput has wrong size");
+
+struct QueueBufferOutput final {
+    QueueBufferOutput();
+
+    void Deflate(u32* width_, u32* height_, u32* transform_hint_, u32* num_pending_buffers_) const {
+        *width_ = width;
+        *height_ = height;
+        *transform_hint_ = transform_hint;
+        *num_pending_buffers_ = num_pending_buffers;
+    }
+
+    void Inflate(u32 width_, u32 height_, u32 transform_hint_, u32 num_pending_buffers_) {
+        width = width_;
+        height = height_;
+        transform_hint = transform_hint_;
+        num_pending_buffers = num_pending_buffers_;
+    }
+
+private:
+    u32 width{};
+    u32 height{};
+    u32 transform_hint{};
+    u32 num_pending_buffers{};
+};
+static_assert(sizeof(QueueBufferOutput) == 16, "QueueBufferOutput has wrong size");
+
+} // namespace Service::android

src/core/hle/service/nvnflinger/hos_binder_driver_server.cpp

@@ -0,0 +1,36 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include <mutex>
+
+#include "common/common_types.h"
+#include "core/hle/service/nvnflinger/hos_binder_driver_server.h"
+
+namespace Service::Nvnflinger {
+
+HosBinderDriverServer::HosBinderDriverServer(Core::System& system_)
+    : service_context(system_, "HosBinderDriverServer") {}
+
+HosBinderDriverServer::~HosBinderDriverServer() {}
+
+u64 HosBinderDriverServer::RegisterProducer(std::unique_ptr<android::IBinder>&& binder) {
+    std::scoped_lock lk{lock};
+
+    last_id++;
+
+    producers[last_id] = std::move(binder);
+
+    return last_id;
+}
+
+android::IBinder* HosBinderDriverServer::TryGetProducer(u64 id) {
+    std::scoped_lock lk{lock};
+
+    if (auto search = producers.find(id); search != producers.end()) {
+        return search->second.get();
+    }
+
+    return {};
+}
+
+} // namespace Service::Nvnflinger

src/core/hle/service/nvnflinger/hos_binder_driver_server.h

@@ -0,0 +1,37 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <memory>
+#include <mutex>
+#include <unordered_map>
+
+#include "common/common_types.h"
+#include "core/hle/service/kernel_helpers.h"
+#include "core/hle/service/nvnflinger/binder.h"
+
+namespace Core {
+class System;
+}
+
+namespace Service::Nvnflinger {
+
+class HosBinderDriverServer final {
+public:
+    explicit HosBinderDriverServer(Core::System& system_);
+    ~HosBinderDriverServer();
+
+    u64 RegisterProducer(std::unique_ptr<android::IBinder>&& binder);
+
+    android::IBinder* TryGetProducer(u64 id);
+
+private:
+    KernelHelpers::ServiceContext service_context;
+
+    std::unordered_map<u64, std::unique_ptr<android::IBinder>> producers;
+    std::mutex lock;
+    u64 last_id{};
+};
+
+} // namespace Service::Nvnflinger

src/core/hle/service/nvnflinger/nvnflinger.cpp

@@ -0,0 +1,335 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include <algorithm>
+#include <optional>
+
+#include "common/assert.h"
+#include "common/logging/log.h"
+#include "common/microprofile.h"
+#include "common/scope_exit.h"
+#include "common/settings.h"
+#include "common/thread.h"
+#include "core/core.h"
+#include "core/core_timing.h"
+#include "core/hle/kernel/k_readable_event.h"
+#include "core/hle/service/nvdrv/devices/nvdisp_disp0.h"
+#include "core/hle/service/nvdrv/nvdrv.h"
+#include "core/hle/service/nvnflinger/buffer_item_consumer.h"
+#include "core/hle/service/nvnflinger/buffer_queue_core.h"
+#include "core/hle/service/nvnflinger/hos_binder_driver_server.h"
+#include "core/hle/service/nvnflinger/nvnflinger.h"
+#include "core/hle/service/nvnflinger/ui/graphic_buffer.h"
+#include "core/hle/service/vi/display/vi_display.h"
+#include "core/hle/service/vi/layer/vi_layer.h"
+#include "core/hle/service/vi/vi_results.h"
+#include "video_core/gpu.h"
+#include "video_core/host1x/host1x.h"
+#include "video_core/host1x/syncpoint_manager.h"
+
+namespace Service::Nvnflinger {
+
+constexpr auto frame_ns = std::chrono::nanoseconds{1000000000 / 60};
+
+void Nvnflinger::SplitVSync(std::stop_token stop_token) {
+    system.RegisterHostThread();
+    std::string name = "VSyncThread";
+    MicroProfileOnThreadCreate(name.c_str());
+
+    // Cleanup
+    SCOPE_EXIT({ MicroProfileOnThreadExit(); });
+
+    Common::SetCurrentThreadName(name.c_str());
+    Common::SetCurrentThreadPriority(Common::ThreadPriority::High);
+
+    while (!stop_token.stop_requested()) {
+        vsync_signal.wait(false);
+        vsync_signal.store(false);
+
+        guard->lock();
+
+        Compose();
+
+        guard->unlock();
+    }
+}
+
+Nvnflinger::Nvnflinger(Core::System& system_, HosBinderDriverServer& hos_binder_driver_server_)
+    : system(system_), service_context(system_, "nvnflinger"),
+      hos_binder_driver_server(hos_binder_driver_server_) {
+    displays.emplace_back(0, "Default", hos_binder_driver_server, service_context, system);
+    displays.emplace_back(1, "External", hos_binder_driver_server, service_context, system);
+    displays.emplace_back(2, "Edid", hos_binder_driver_server, service_context, system);
+    displays.emplace_back(3, "Internal", hos_binder_driver_server, service_context, system);
+    displays.emplace_back(4, "Null", hos_binder_driver_server, service_context, system);
+    guard = std::make_shared<std::mutex>();
+
+    // Schedule the screen composition events
+    multi_composition_event = Core::Timing::CreateEvent(
+        "ScreenComposition",
+        [this](std::uintptr_t, s64 time,
+               std::chrono::nanoseconds ns_late) -> std::optional<std::chrono::nanoseconds> {
+            vsync_signal.store(true);
+            vsync_signal.notify_all();
+            return std::chrono::nanoseconds(GetNextTicks());
+        });
+
+    single_composition_event = Core::Timing::CreateEvent(
+        "ScreenComposition",
+        [this](std::uintptr_t, s64 time,
+               std::chrono::nanoseconds ns_late) -> std::optional<std::chrono::nanoseconds> {
+            const auto lock_guard = Lock();
+            Compose();
+
+            return std::chrono::nanoseconds(GetNextTicks());
+        });
+
+    if (system.IsMulticore()) {
+        system.CoreTiming().ScheduleLoopingEvent(frame_ns, frame_ns, multi_composition_event);
+        vsync_thread = std::jthread([this](std::stop_token token) { SplitVSync(token); });
+    } else {
+        system.CoreTiming().ScheduleLoopingEvent(frame_ns, frame_ns, single_composition_event);
+    }
+}
+
+Nvnflinger::~Nvnflinger() {
+    if (system.IsMulticore()) {
+        system.CoreTiming().UnscheduleEvent(multi_composition_event, {});
+        vsync_thread.request_stop();
+        vsync_signal.store(true);
+        vsync_signal.notify_all();
+    } else {
+        system.CoreTiming().UnscheduleEvent(single_composition_event, {});
+    }
+
+    ShutdownLayers();
+
+    if (nvdrv) {
+        nvdrv->Close(disp_fd);
+    }
+}
+
+void Nvnflinger::ShutdownLayers() {
+    for (auto& display : displays) {
+        for (size_t layer = 0; layer < display.GetNumLayers(); ++layer) {
+            display.GetLayer(layer).Core().NotifyShutdown();
+        }
+    }
+}
+
+void Nvnflinger::SetNVDrvInstance(std::shared_ptr<Nvidia::Module> instance) {
+    nvdrv = std::move(instance);
+    disp_fd = nvdrv->Open("/dev/nvdisp_disp0");
+}
+
+std::optional<u64> Nvnflinger::OpenDisplay(std::string_view name) {
+    const auto lock_guard = Lock();
+
+    LOG_DEBUG(Service_Nvnflinger, "Opening \"{}\" display", name);
+
+    const auto itr =
+        std::find_if(displays.begin(), displays.end(),
+                     [&](const VI::Display& display) { return display.GetName() == name; });
+
+    if (itr == displays.end()) {
+        return std::nullopt;
+    }
+
+    return itr->GetID();
+}
+
+bool Nvnflinger::CloseDisplay(u64 display_id) {
+    const auto lock_guard = Lock();
+    auto* const display = FindDisplay(display_id);
+
+    if (display == nullptr) {
+        return false;
+    }
+
+    display->Reset();
+
+    return true;
+}
+
+std::optional<u64> Nvnflinger::CreateLayer(u64 display_id) {
+    const auto lock_guard = Lock();
+    auto* const display = FindDisplay(display_id);
+
+    if (display == nullptr) {
+        return std::nullopt;
+    }
+
+    const u64 layer_id = next_layer_id++;
+    CreateLayerAtId(*display, layer_id);
+    return layer_id;
+}
+
+void Nvnflinger::CreateLayerAtId(VI::Display& display, u64 layer_id) {
+    const auto buffer_id = next_buffer_queue_id++;
+    display.CreateLayer(layer_id, buffer_id, nvdrv->container);
+}
+
+void Nvnflinger::CloseLayer(u64 layer_id) {
+    const auto lock_guard = Lock();
+
+    for (auto& display : displays) {
+        display.CloseLayer(layer_id);
+    }
+}
+
+std::optional<u32> Nvnflinger::FindBufferQueueId(u64 display_id, u64 layer_id) {
+    const auto lock_guard = Lock();
+    const auto* const layer = FindOrCreateLayer(display_id, layer_id);
+
+    if (layer == nullptr) {
+        return std::nullopt;
+    }
+
+    return layer->GetBinderId();
+}
+
+ResultVal<Kernel::KReadableEvent*> Nvnflinger::FindVsyncEvent(u64 display_id) {
+    const auto lock_guard = Lock();
+    auto* const display = FindDisplay(display_id);
+
+    if (display == nullptr) {
+        return VI::ResultNotFound;
+    }
+
+    return display->GetVSyncEvent();
+}
+
+VI::Display* Nvnflinger::FindDisplay(u64 display_id) {
+    const auto itr =
+        std::find_if(displays.begin(), displays.end(),
+                     [&](const VI::Display& display) { return display.GetID() == display_id; });
+
+    if (itr == displays.end()) {
+        return nullptr;
+    }
+
+    return &*itr;
+}
+
+const VI::Display* Nvnflinger::FindDisplay(u64 display_id) const {
+    const auto itr =
+        std::find_if(displays.begin(), displays.end(),
+                     [&](const VI::Display& display) { return display.GetID() == display_id; });
+
+    if (itr == displays.end()) {
+        return nullptr;
+    }
+
+    return &*itr;
+}
+
+VI::Layer* Nvnflinger::FindLayer(u64 display_id, u64 layer_id) {
+    auto* const display = FindDisplay(display_id);
+
+    if (display == nullptr) {
+        return nullptr;
+    }
+
+    return display->FindLayer(layer_id);
+}
+
+const VI::Layer* Nvnflinger::FindLayer(u64 display_id, u64 layer_id) const {
+    const auto* const display = FindDisplay(display_id);
+
+    if (display == nullptr) {
+        return nullptr;
+    }
+
+    return display->FindLayer(layer_id);
+}
+
+VI::Layer* Nvnflinger::FindOrCreateLayer(u64 display_id, u64 layer_id) {
+    auto* const display = FindDisplay(display_id);
+
+    if (display == nullptr) {
+        return nullptr;
+    }
+
+    auto* layer = display->FindLayer(layer_id);
+
+    if (layer == nullptr) {
+        LOG_DEBUG(Service_Nvnflinger, "Layer at id {} not found. Trying to create it.", layer_id);
+        CreateLayerAtId(*display, layer_id);
+        return display->FindLayer(layer_id);
+    }
+
+    return layer;
+}
+
+void Nvnflinger::Compose() {
+    for (auto& display : displays) {
+        // Trigger vsync for this display at the end of drawing
+        SCOPE_EXIT({ display.SignalVSyncEvent(); });
+
+        // Don't do anything for displays without layers.
+        if (!display.HasLayers())
+            continue;
+
+        // TODO(Subv): Support more than 1 layer.
+        VI::Layer& layer = display.GetLayer(0);
+
+        android::BufferItem buffer{};
+        const auto status = layer.GetConsumer().AcquireBuffer(&buffer, {}, false);
+
+        if (status != android::Status::NoError) {
+            continue;
+        }
+
+        const auto& igbp_buffer = *buffer.graphic_buffer;
+
+        if (!system.IsPoweredOn()) {
+            return; // We are likely shutting down
+        }
+
+        // Now send the buffer to the GPU for drawing.
+        // TODO(Subv): Support more than just disp0. The display device selection is probably based
+        // on which display we're drawing (Default, Internal, External, etc)
+        auto nvdisp = nvdrv->GetDevice<Nvidia::Devices::nvdisp_disp0>(disp_fd);
+        ASSERT(nvdisp);
+
+        guard->unlock();
+        Common::Rectangle<int> crop_rect{
+            static_cast<int>(buffer.crop.Left()), static_cast<int>(buffer.crop.Top()),
+            static_cast<int>(buffer.crop.Right()), static_cast<int>(buffer.crop.Bottom())};
+
+        nvdisp->flip(igbp_buffer.BufferId(), igbp_buffer.Offset(), igbp_buffer.ExternalFormat(),
+                     igbp_buffer.Width(), igbp_buffer.Height(), igbp_buffer.Stride(),
+                     static_cast<android::BufferTransformFlags>(buffer.transform), crop_rect,
+                     buffer.fence.fences, buffer.fence.num_fences);
+
+        MicroProfileFlip();
+        guard->lock();
+
+        swap_interval = buffer.swap_interval;
+
+        layer.GetConsumer().ReleaseBuffer(buffer, android::Fence::NoFence());
+    }
+}
+
+s64 Nvnflinger::GetNextTicks() const {
+    const auto& settings = Settings::values;
+    auto speed_scale = 1.f;
+    if (settings.use_multi_core.GetValue()) {
+        if (settings.use_speed_limit.GetValue()) {
+            // Scales the speed based on speed_limit setting on MC. SC is handled by
+            // SpeedLimiter::DoSpeedLimiting.
+            speed_scale = 100.f / settings.speed_limit.GetValue();
+        } else {
+            // Run at unlocked framerate.
+            speed_scale = 0.01f;
+        }
+    }
+
+    // As an extension, treat nonpositive swap interval as framerate multiplier.
+    const f32 effective_fps = swap_interval <= 0 ? 120.f * static_cast<f32>(1 - swap_interval)
+                                                 : 60.f / static_cast<f32>(swap_interval);
+
+    return static_cast<s64>(speed_scale * (1000000000.f / effective_fps));
+}
+
+} // namespace Service::Nvnflinger

src/core/hle/service/nvnflinger/nvnflinger.h

@@ -0,0 +1,155 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <list>
+#include <memory>
+#include <mutex>
+#include <optional>
+#include <thread>
+#include <vector>
+
+#include "common/common_types.h"
+#include "common/polyfill_thread.h"
+#include "core/hle/result.h"
+#include "core/hle/service/kernel_helpers.h"
+
+namespace Common {
+class Event;
+} // namespace Common
+
+namespace Core::Timing {
+class CoreTiming;
+struct EventType;
+} // namespace Core::Timing
+
+namespace Kernel {
+class KReadableEvent;
+} // namespace Kernel
+
+namespace Service::Nvidia {
+class Module;
+} // namespace Service::Nvidia
+
+namespace Service::VI {
+class Display;
+class Layer;
+} // namespace Service::VI
+
+namespace Service::android {
+class BufferQueueCore;
+class BufferQueueProducer;
+} // namespace Service::android
+
+namespace Service::Nvnflinger {
+
+class Nvnflinger final {
+public:
+    explicit Nvnflinger(Core::System& system_, HosBinderDriverServer& hos_binder_driver_server_);
+    ~Nvnflinger();
+
+    void ShutdownLayers();
+
+    /// Sets the NVDrv module instance to use to send buffers to the GPU.
+    void SetNVDrvInstance(std::shared_ptr<Nvidia::Module> instance);
+
+    /// Opens the specified display and returns the ID.
+    ///
+    /// If an invalid display name is provided, then an empty optional is returned.
+    [[nodiscard]] std::optional<u64> OpenDisplay(std::string_view name);
+
+    /// Closes the specified display by its ID.
+    ///
+    /// Returns false if an invalid display ID is provided.
+    [[nodiscard]] bool CloseDisplay(u64 display_id);
+
+    /// Creates a layer on the specified display and returns the layer ID.
+    ///
+    /// If an invalid display ID is specified, then an empty optional is returned.
+    [[nodiscard]] std::optional<u64> CreateLayer(u64 display_id);
+
+    /// Closes a layer on all displays for the given layer ID.
+    void CloseLayer(u64 layer_id);
+
+    /// Finds the buffer queue ID of the specified layer in the specified display.
+    ///
+    /// If an invalid display ID or layer ID is provided, then an empty optional is returned.
+    [[nodiscard]] std::optional<u32> FindBufferQueueId(u64 display_id, u64 layer_id);
+
+    /// Gets the vsync event for the specified display.
+    ///
+    /// If an invalid display ID is provided, then VI::ResultNotFound is returned.
+    /// If the vsync event has already been retrieved, then VI::ResultPermissionDenied is returned.
+    [[nodiscard]] ResultVal<Kernel::KReadableEvent*> FindVsyncEvent(u64 display_id);
+
+    /// Performs a composition request to the emulated nvidia GPU and triggers the vsync events when
+    /// finished.
+    void Compose();
+
+    [[nodiscard]] s64 GetNextTicks() const;
+
+private:
+    struct Layer {
+        std::unique_ptr<android::BufferQueueCore> core;
+        std::unique_ptr<android::BufferQueueProducer> producer;
+    };
+
+private:
+    [[nodiscard]] std::unique_lock<std::mutex> Lock() const {
+        return std::unique_lock{*guard};
+    }
+
+    /// Finds the display identified by the specified ID.
+    [[nodiscard]] VI::Display* FindDisplay(u64 display_id);
+
+    /// Finds the display identified by the specified ID.
+    [[nodiscard]] const VI::Display* FindDisplay(u64 display_id) const;
+
+    /// Finds the layer identified by the specified ID in the desired display.
+    [[nodiscard]] VI::Layer* FindLayer(u64 display_id, u64 layer_id);
+
+    /// Finds the layer identified by the specified ID in the desired display.
+    [[nodiscard]] const VI::Layer* FindLayer(u64 display_id, u64 layer_id) const;
+
+    /// Finds the layer identified by the specified ID in the desired display,
+    /// or creates the layer if it is not found.
+    /// To be used when the system expects the specified ID to already exist.
+    [[nodiscard]] VI::Layer* FindOrCreateLayer(u64 display_id, u64 layer_id);
+
+    /// Creates a layer with the specified layer ID in the desired display.
+    void CreateLayerAtId(VI::Display& display, u64 layer_id);
+
+    void SplitVSync(std::stop_token stop_token);
+
+    std::shared_ptr<Nvidia::Module> nvdrv;
+    s32 disp_fd;
+
+    std::list<VI::Display> displays;
+
+    /// Id to use for the next layer that is created, this counter is shared among all displays.
+    u64 next_layer_id = 1;
+    /// Id to use for the next buffer queue that is created, this counter is shared among all
+    /// layers.
+    u32 next_buffer_queue_id = 1;
+
+    s32 swap_interval = 1;
+
+    /// Event that handles screen composition.
+    std::shared_ptr<Core::Timing::EventType> multi_composition_event;
+    std::shared_ptr<Core::Timing::EventType> single_composition_event;
+
+    std::shared_ptr<std::mutex> guard;
+
+    Core::System& system;
+
+    std::atomic<bool> vsync_signal;
+
+    std::jthread vsync_thread;
+
+    KernelHelpers::ServiceContext service_context;
+
+    HosBinderDriverServer& hos_binder_driver_server;
+};
+
+} // namespace Service::Nvnflinger

src/core/hle/service/nvnflinger/parcel.h

@@ -0,0 +1,177 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <memory>
+#include <span>
+#include <vector>
+
+#include "common/alignment.h"
+#include "common/assert.h"
+#include "common/common_types.h"
+
+namespace Service::android {
+
+struct ParcelHeader {
+    u32 data_size;
+    u32 data_offset;
+    u32 objects_size;
+    u32 objects_offset;
+};
+static_assert(sizeof(ParcelHeader) == 16, "ParcelHeader has wrong size");
+
+class InputParcel final {
+public:
+    explicit InputParcel(std::span<const u8> in_data) : read_buffer(std::move(in_data)) {
+        DeserializeHeader();
+        [[maybe_unused]] const std::u16string token = ReadInterfaceToken();
+    }
+
+    template <typename T>
+    void Read(T& val) {
+        static_assert(std::is_trivially_copyable_v<T>, "T must be trivially copyable.");
+        ASSERT(read_index + sizeof(T) <= read_buffer.size());
+
+        std::memcpy(&val, read_buffer.data() + read_index, sizeof(T));
+        read_index += sizeof(T);
+        read_index = Common::AlignUp(read_index, 4);
+    }
+
+    template <typename T>
+    T Read() {
+        T val;
+        Read(val);
+        return val;
+    }
+
+    template <typename T>
+    void ReadFlattened(T& val) {
+        const auto flattened_size = Read<s64>();
+        ASSERT(sizeof(T) == flattened_size);
+        Read(val);
+    }
+
+    template <typename T>
+    T ReadFlattened() {
+        T val;
+        ReadFlattened(val);
+        return val;
+    }
+
+    template <typename T>
+    T ReadUnaligned() {
+        static_assert(std::is_trivially_copyable_v<T>, "T must be trivially copyable.");
+        ASSERT(read_index + sizeof(T) <= read_buffer.size());
+
+        T val;
+        std::memcpy(&val, read_buffer.data() + read_index, sizeof(T));
+        read_index += sizeof(T);
+        return val;
+    }
+
+    template <typename T>
+    const std::shared_ptr<T> ReadObject() {
+        static_assert(std::is_trivially_copyable_v<T>, "T must be trivially copyable.");
+
+        const auto is_valid{Read<bool>()};
+
+        if (is_valid) {
+            auto result = std::make_shared<T>();
+            ReadFlattened(*result);
+            return result;
+        }
+
+        return {};
+    }
+
+    std::u16string ReadInterfaceToken() {
+        [[maybe_unused]] const u32 unknown = Read<u32>();
+        const u32 length = Read<u32>();
+
+        std::u16string token;
+        token.reserve(length + 1);
+
+        for (u32 ch = 0; ch < length + 1; ++ch) {
+            token.push_back(ReadUnaligned<u16>());
+        }
+
+        read_index = Common::AlignUp(read_index, 4);
+
+        return token;
+    }
+
+    void DeserializeHeader() {
+        ASSERT(read_buffer.size() > sizeof(ParcelHeader));
+
+        ParcelHeader header{};
+        std::memcpy(&header, read_buffer.data(), sizeof(ParcelHeader));
+
+        read_index = header.data_offset;
+    }
+
+private:
+    std::span<const u8> read_buffer;
+    std::size_t read_index = 0;
+};
+
+class OutputParcel final {
+public:
+    static constexpr std::size_t DefaultBufferSize = 0x40;
+
+    OutputParcel() : buffer(DefaultBufferSize) {}
+
+    template <typename T>
+    explicit OutputParcel(const T& out_data) : buffer(DefaultBufferSize) {
+        Write(out_data);
+    }
+
+    template <typename T>
+    void Write(const T& val) {
+        static_assert(std::is_trivially_copyable_v<T>, "T must be trivially copyable.");
+
+        if (buffer.size() < write_index + sizeof(T)) {
+            buffer.resize(buffer.size() + sizeof(T) + DefaultBufferSize);
+        }
+
+        std::memcpy(buffer.data() + write_index, &val, sizeof(T));
+        write_index += sizeof(T);
+        write_index = Common::AlignUp(write_index, 4);
+    }
+
+    template <typename T>
+    void WriteObject(const T* ptr) {
+        static_assert(std::is_trivially_copyable_v<T>, "T must be trivially copyable.");
+
+        if (!ptr) {
+            Write<u32>(0);
+            return;
+        }
+
+        Write<u32>(1);
+        Write<s64>(sizeof(T));
+        Write(*ptr);
+    }
+
+    template <typename T>
+    void WriteObject(const std::shared_ptr<T> ptr) {
+        WriteObject(ptr.get());
+    }
+
+    std::vector<u8> Serialize() const {
+        ParcelHeader header{};
+        header.data_size = static_cast<u32>(write_index - sizeof(ParcelHeader));
+        header.data_offset = sizeof(ParcelHeader);
+        header.objects_size = 4;
+        header.objects_offset = static_cast<u32>(sizeof(ParcelHeader) + header.data_size);
+        std::memcpy(buffer.data(), &header, sizeof(ParcelHeader));
+
+        return buffer;
+    }
+
+private:
+    mutable std::vector<u8> buffer;
+    std::size_t write_index = sizeof(ParcelHeader);
+};
+
+} // namespace Service::android

src/core/hle/service/nvnflinger/pixel_format.h

@@ -0,0 +1,21 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include "common/common_types.h"
+
+namespace Service::android {
+
+enum class PixelFormat : u32 {
+    NoFormat = 0,
+    Rgba8888 = 1,
+    Rgbx8888 = 2,
+    Rgb888 = 3,
+    Rgb565 = 4,
+    Bgra8888 = 5,
+    Rgba5551 = 6,
+    Rgba4444 = 7,
+};
+
+} // namespace Service::android

src/core/hle/service/nvnflinger/producer_listener.h

@@ -0,0 +1,17 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2014 The Android Open Source Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Parts of this implementation were based on:
+// https://cs.android.com/android/platform/superproject/+/android-5.1.1_r38:frameworks/native/include/gui/IProducerListener.h
+
+#pragma once
+
+namespace Service::android {
+
+class IProducerListener {
+public:
+    virtual ~IProducerListener() = default;
+    virtual void OnBufferReleased() = 0;
+};
+
+} // namespace Service::android

src/core/hle/service/nvnflinger/status.h

@@ -0,0 +1,28 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include "common/common_funcs.h"
+#include "common/common_types.h"
+
+namespace Service::android {
+
+enum class Status : s32 {
+    None = 0,
+    NoError = 0,
+    StaleBufferSlot = 1,
+    NoBufferAvailable = 2,
+    PresentLater = 3,
+    WouldBlock = -11,
+    NoMemory = -12,
+    Busy = -16,
+    NoInit = -19,
+    BadValue = -22,
+    InvalidOperation = -37,
+    BufferNeedsReallocation = 1,
+    ReleaseAllBuffers = 2,
+};
+DECLARE_ENUM_FLAG_OPERATORS(Status);
+
+} // namespace Service::android

src/core/hle/service/nvnflinger/ui/fence.h

@@ -0,0 +1,32 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2012 The Android Open Source Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Parts of this implementation were based on:
+// https://cs.android.com/android/platform/superproject/+/android-5.1.1_r38:frameworks/native/include/ui/Fence.h
+
+#pragma once
+
+#include <array>
+
+#include "common/common_types.h"
+#include "core/hle/service/nvdrv/nvdata.h"
+
+namespace Service::android {
+
+class Fence {
+public:
+    constexpr Fence() = default;
+
+    static constexpr Fence NoFence() {
+        Fence fence;
+        fence.fences[0].id = -1;
+        return fence;
+    }
+
+public:
+    u32 num_fences{};
+    std::array<Service::Nvidia::NvFence, 4> fences{};
+};
+static_assert(sizeof(Fence) == 36, "Fence has wrong size");
+
+} // namespace Service::android

src/core/hle/service/nvnflinger/ui/graphic_buffer.h

@@ -0,0 +1,100 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-FileCopyrightText: Copyright 2007 The Android Open Source Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Parts of this implementation were based on:
+// https://cs.android.com/android/platform/superproject/+/android-5.1.1_r38:frameworks/native/include/ui/GraphicBuffer.h
+
+#pragma once
+
+#include "common/common_funcs.h"
+#include "common/common_types.h"
+#include "core/hle/service/nvnflinger/pixel_format.h"
+
+namespace Service::android {
+
+class GraphicBuffer final {
+public:
+    constexpr GraphicBuffer() = default;
+
+    constexpr GraphicBuffer(u32 width_, u32 height_, PixelFormat format_, u32 usage_)
+        : width{static_cast<s32>(width_)}, height{static_cast<s32>(height_)}, format{format_},
+          usage{static_cast<s32>(usage_)} {}
+
+    constexpr u32 Width() const {
+        return static_cast<u32>(width);
+    }
+
+    constexpr u32 Height() const {
+        return static_cast<u32>(height);
+    }
+
+    constexpr u32 Stride() const {
+        return static_cast<u32>(stride);
+    }
+
+    constexpr u32 Usage() const {
+        return static_cast<u32>(usage);
+    }
+
+    constexpr PixelFormat Format() const {
+        return format;
+    }
+
+    constexpr u32 BufferId() const {
+        return buffer_id;
+    }
+
+    constexpr PixelFormat ExternalFormat() const {
+        return external_format;
+    }
+
+    constexpr u32 Handle() const {
+        return handle;
+    }
+
+    constexpr u32 Offset() const {
+        return offset;
+    }
+
+    constexpr bool NeedsReallocation(u32 width_, u32 height_, PixelFormat format_,
+                                     u32 usage_) const {
+        if (static_cast<s32>(width_) != width) {
+            return true;
+        }
+
+        if (static_cast<s32>(height_) != height) {
+            return true;
+        }
+
+        if (format_ != format) {
+            return true;
+        }
+
+        if ((static_cast<u32>(usage) & usage_) != usage_) {
+            return true;
+        }
+
+        return false;
+    }
+
+private:
+    u32 magic{};
+    s32 width{};
+    s32 height{};
+    s32 stride{};
+    PixelFormat format{};
+    s32 usage{};
+    INSERT_PADDING_WORDS(1);
+    u32 index{};
+    INSERT_PADDING_WORDS(3);
+    u32 buffer_id{};
+    INSERT_PADDING_WORDS(6);
+    PixelFormat external_format{};
+    INSERT_PADDING_WORDS(10);
+    u32 handle{};
+    u32 offset{};
+    INSERT_PADDING_WORDS(60);
+};
+static_assert(sizeof(GraphicBuffer) == 0x16C, "GraphicBuffer has wrong size");
+
+} // namespace Service::android

src/core/hle/service/nvnflinger/window.h

@@ -0,0 +1,53 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include "common/common_funcs.h"
+#include "common/common_types.h"
+
+namespace Service::android {
+
+/// Attributes queryable with Query
+enum class NativeWindow : s32 {
+    Width = 0,
+    Height = 1,
+    Format = 2,
+    MinUndequeedBuffers = 3,
+    QueuesToWindowComposer = 4,
+    ConcreteType = 5,
+    DefaultWidth = 6,
+    DefaultHeight = 7,
+    TransformHint = 8,
+    ConsumerRunningBehind = 9,
+    ConsumerUsageBits = 10,
+    StickyTransform = 11,
+    DefaultDataSpace = 12,
+    BufferAge = 13,
+};
+
+/// Parameter for Connect/Disconnect
+enum class NativeWindowApi : s32 {
+    NoConnectedApi = 0,
+    Egl = 1,
+    Cpu = 2,
+    Media = 3,
+    Camera = 4,
+};
+
+/// Scaling mode parameter for QueueBuffer
+enum class NativeWindowScalingMode : s32 {
+    Freeze = 0,
+    ScaleToWindow = 1,
+    ScaleCrop = 2,
+    NoScaleCrop = 3,
+};
+
+/// Transform parameter for QueueBuffer
+enum class NativeWindowTransform : u32 {
+    None = 0x0,
+    InverseDisplay = 0x08,
+};
+DECLARE_ENUM_FLAG_OPERATORS(NativeWindowTransform);
+
+} // namespace Service::android