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// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later
#pragma once
#include <array>
#include "common/common_types.h"
namespace Service::IRS {
template <typename State, std::size_t max_buffer_size>
struct Lifo {
s64 sampling_number{};
s64 buffer_count{};
std::array<State, max_buffer_size> entries{};
const State& ReadCurrentEntry() const {
return entries[GetBufferTail()];
}
const State& ReadPreviousEntry() const {
return entries[GetPreviousEntryIndex()];
}
s64 GetBufferTail() const {
return sampling_number % max_buffer_size;
}
std::size_t GetPreviousEntryIndex() const {
return static_cast<size_t>((GetBufferTail() + max_buffer_size - 1) % max_buffer_size);
}
std::size_t GetNextEntryIndex() const {
return static_cast<size_t>((GetBufferTail() + 1) % max_buffer_size);
}
void WriteNextEntry(const State& new_state) {
if (buffer_count < static_cast<s64>(max_buffer_size)) {
buffer_count++;
}
sampling_number++;
entries[GetBufferTail()] = new_state;
}
};
} // namespace Service::IRS
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