service/hid: Create ring LIFO
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8fff6d6c67
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@ -132,7 +132,6 @@ add_library(core STATIC
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frontend/emu_window.h
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frontend/framebuffer_layout.cpp
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frontend/framebuffer_layout.h
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frontend/input.h
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hardware_interrupt_manager.cpp
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hardware_interrupt_manager.h
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hid/emulated_console.cpp
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@ -415,6 +414,7 @@ add_library(core STATIC
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hle/service/hid/hid.h
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hle/service/hid/irs.cpp
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hle/service/hid/irs.h
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hle/service/hid/ring_lifo.h
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hle/service/hid/xcd.cpp
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hle/service/hid/xcd.h
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hle/service/hid/errors.h
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@ -0,0 +1,54 @@
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// Copyright 2021 yuzu Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included
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#pragma once
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#include "common/common_types.h"
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#include "common/swap.h"
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namespace Service::HID {
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constexpr std::size_t max_entry_size = 17;
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template <typename State>
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struct AtomicStorage {
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s64_le sampling_number;
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State state;
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};
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template <typename State>
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struct Lifo {
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s64_le timestamp{};
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s64_le total_entry_count = max_entry_size;
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s64_le last_entry_index{};
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s64_le entry_count{};
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std::array<AtomicStorage<State>, max_entry_size> entries{};
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const AtomicStorage<State>& ReadCurrentEntry() const {
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return entries[last_entry_index];
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}
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const AtomicStorage<State>& ReadPreviousEntry() const {
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return entries[GetPreviuousEntryIndex()];
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}
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std::size_t GetPreviuousEntryIndex() const {
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return (last_entry_index + total_entry_count - 1) % total_entry_count;
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}
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std::size_t GetNextEntryIndex() const {
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return (last_entry_index + 1) % total_entry_count;
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}
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void WriteNextEntry(const State& new_state) {
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if (entry_count < total_entry_count - 1) {
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entry_count++;
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}
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last_entry_index = GetNextEntryIndex();
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const auto& previous_entry = ReadPreviousEntry();
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entries[last_entry_index].sampling_number = previous_entry.sampling_number + 1;
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entries[last_entry_index].state = new_state;
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}
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};
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} // namespace Service::HID
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