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// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <array>
#include "common/common_types.h"
namespace Service::HID {
template <typename State>
struct AtomicStorage {
s64 sampling_number;
State state;
};
template <typename State, std::size_t max_buffer_size>
struct Lifo {
s64 timestamp{};
s64 total_buffer_count = static_cast<s64>(max_buffer_size);
s64 buffer_tail{};
s64 buffer_count{};
std::array<AtomicStorage<State>, max_buffer_size> entries{};
const AtomicStorage<State>& ReadCurrentEntry() const {
return entries[buffer_tail];
}
const AtomicStorage<State>& ReadPreviousEntry() const {
return entries[GetPreviousEntryIndex()];
}
std::size_t GetPreviousEntryIndex() const {
return static_cast<size_t>((buffer_tail + total_buffer_count - 1) % total_buffer_count);
}
std::size_t GetNextEntryIndex() const {
return static_cast<size_t>((buffer_tail + 1) % total_buffer_count);
}
void WriteNextEntry(const State& new_state) {
if (buffer_count < total_buffer_count - 1) {
buffer_count++;
}
buffer_tail = GetNextEntryIndex();
const auto& previous_entry = ReadPreviousEntry();
entries[buffer_tail].sampling_number = previous_entry.sampling_number + 1;
entries[buffer_tail].state = new_state;
}
};
} // namespace Service::HID
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