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// Copyright 2016 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "Common/Config/Config.h"
#include <algorithm>
#include <atomic>
#include <map>
#include <mutex>
#include <shared_mutex>
#include <utility>
#include <vector>
namespace Config
{
using Layers = std::map<LayerType, std::shared_ptr<Layer>>;
static Layers s_layers;
static std::vector<std::pair<ConfigChangedCallbackID, ConfigChangedCallback>> s_callbacks;
static size_t s_next_callback_id = 0;
static u32 s_callback_guards = 0;
static std::atomic<u64> s_config_version = 0;
static std::shared_mutex s_layers_rw_lock;
using ReadLock = std::shared_lock<std::shared_mutex>;
using WriteLock = std::unique_lock<std::shared_mutex>;
static void AddLayerInternal(std::shared_ptr<Layer> layer)
{
{
WriteLock lock(s_layers_rw_lock);
const Config::LayerType layer_type = layer->GetLayer();
s_layers.insert_or_assign(layer_type, std::move(layer));
}
OnConfigChanged();
}
void AddLayer(std::unique_ptr<ConfigLayerLoader> loader)
{
AddLayerInternal(std::make_shared<Layer>(std::move(loader)));
}
std::shared_ptr<Layer> GetLayer(LayerType layer)
{
ReadLock lock(s_layers_rw_lock);
std::shared_ptr<Layer> result;
const auto it = s_layers.find(layer);
if (it != s_layers.end())
{
result = it->second;
}
return result;
}
void RemoveLayer(LayerType layer)
{
{
WriteLock lock(s_layers_rw_lock);
s_layers.erase(layer);
}
OnConfigChanged();
}
ConfigChangedCallbackID AddConfigChangedCallback(ConfigChangedCallback func)
{
const ConfigChangedCallbackID callback_id{s_next_callback_id};
++s_next_callback_id;
s_callbacks.emplace_back(std::make_pair(callback_id, std::move(func)));
return callback_id;
}
void RemoveConfigChangedCallback(ConfigChangedCallbackID callback_id)
{
for (auto it = s_callbacks.begin(); it != s_callbacks.end(); ++it)
{
if (it->first == callback_id)
{
s_callbacks.erase(it);
return;
}
}
}
void OnConfigChanged()
{
// Increment the config version to invalidate caches.
// To ensure that getters do not return stale data, this should always be done
// even when callbacks are suppressed.
s_config_version.fetch_add(1, std::memory_order_relaxed);
if (s_callback_guards)
return;
for (const auto& callback : s_callbacks)
callback.second();
}
u64 GetConfigVersion()
{
return s_config_version.load(std::memory_order_relaxed);
}
// Explicit load and save of layers
void Load()
{
{
ReadLock lock(s_layers_rw_lock);
for (auto& layer : s_layers)
layer.second->Load();
}
OnConfigChanged();
}
void Save()
{
{
ReadLock lock(s_layers_rw_lock);
for (auto& layer : s_layers)
layer.second->Save();
}
OnConfigChanged();
}
void Init()
{
// These layers contain temporary values
ClearCurrentRunLayer();
}
void Shutdown()
{
WriteLock lock(s_layers_rw_lock);
s_layers.clear();
}
void ClearCurrentRunLayer()
{
WriteLock lock(s_layers_rw_lock);
s_layers.insert_or_assign(LayerType::CurrentRun, std::make_shared<Layer>(LayerType::CurrentRun));
}
static const std::map<System, std::string> system_to_name = {
{System::Main, "Dolphin"},
{System::GCPad, "GCPad"},
{System::WiiPad, "Wiimote"},
{System::GCKeyboard, "GCKeyboard"},
{System::GFX, "Graphics"},
{System::Logger, "Logger"},
{System::SYSCONF, "SYSCONF"},
{System::DualShockUDPClient, "DualShockUDPClient"},
{System::FreeLook, "FreeLook"},
{System::Session, "Session"},
{System::GameSettingsOnly, "GameSettingsOnly"},
{System::Achievements, "Achievements"}};
const std::string& GetSystemName(System system)
{
return system_to_name.at(system);
}
std::optional<System> GetSystemFromName(const std::string& name)
{
const auto system = std::find_if(system_to_name.begin(), system_to_name.end(),
[&name](const auto& entry) { return entry.second == name; });
if (system != system_to_name.end())
return system->first;
return {};
}
const std::string& GetLayerName(LayerType layer)
{
static const std::map<LayerType, std::string> layer_to_name = {
{LayerType::Base, "Base"},
{LayerType::GlobalGame, "Global GameINI"},
{LayerType::LocalGame, "Local GameINI"},
{LayerType::Netplay, "Netplay"},
{LayerType::Movie, "Movie"},
{LayerType::CommandLine, "Command Line"},
{LayerType::CurrentRun, "Current Run"},
};
return layer_to_name.at(layer);
}
LayerType GetActiveLayerForConfig(const Location& config)
{
ReadLock lock(s_layers_rw_lock);
for (auto layer : SEARCH_ORDER)
{
const auto it = s_layers.find(layer);
if (it != s_layers.end())
{
if (it->second->Exists(config))
return layer;
}
}
// If config is not present in any layer, base layer is considered active.
return LayerType::Base;
}
std::optional<std::string> GetAsString(const Location& config)
{
std::optional<std::string> result;
ReadLock lock(s_layers_rw_lock);
for (auto layer : SEARCH_ORDER)
{
const auto it = s_layers.find(layer);
if (it != s_layers.end())
{
result = it->second->Get<std::string>(config);
if (result.has_value())
break;
}
}
return result;
}
ConfigChangeCallbackGuard::ConfigChangeCallbackGuard()
{
++s_callback_guards;
}
ConfigChangeCallbackGuard::~ConfigChangeCallbackGuard()
{
if (--s_callback_guards)
return;
OnConfigChanged();
}
} // namespace Config
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