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// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later
// 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 <deque>
#include <list>
#include <memory>
#include <mutex>
#include <set>
#include <vector>
#include <unordered_map>
#include <algorithm>
#include "core/hle/service/nvnflinger/buffer_item.h"
#include "core/hle/service/nvnflinger/buffer_queue_defs.h"
#include "core/hle/service/nvnflinger/buffer_slot.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 {
struct BufferHistoryInfo {
u64 frame_number{};
s64 queue_time{};
s64 presentation_time{};
BufferState state{};
};
class IConsumerListener;
class IProducerListener;
class BufferQueueCore final {
friend class BufferQueueProducer;
friend class BufferQueueConsumer;
public:
static constexpr s32 INVALID_BUFFER_SLOT = BufferItem::INVALID_BUFFER_SLOT;
static constexpr u32 BUFFER_HISTORY_SIZE = 8;
BufferQueueCore();
~BufferQueueCore();
void PushHistory(u64 frame_number, s64 queue_time, s64 presentation_time, BufferState state);
void UpdateHistory(u64 frame_number, BufferState state);
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{};
std::unordered_map<u64, BufferHistoryInfo> buffer_history_map{};
mutable std::mutex buffer_history_mutex{};
std::deque<u64> buffer_history_order;
u32 transform_hint{};
bool is_allocating{};
mutable std::condition_variable_any is_allocating_condition;
};
} // namespace Service::android
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