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// Copyright 2025 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "VideoCommon/Assets/CustomAssetLoader.h"
#include <fmt/format.h>
#include "Common/Logging/Log.h"
#include "Common/Thread.h"
#include "UICommon/UICommon.h"
namespace VideoCommon
{
void CustomAssetLoader::Initialize()
{
ResizeWorkerThreads(2);
}
void CustomAssetLoader::Shutdown()
{
Reset(false);
}
bool CustomAssetLoader::StartWorkerThreads(u32 num_worker_threads)
{
for (u32 i = 0; i < num_worker_threads; i++)
{
m_worker_threads.emplace_back(&CustomAssetLoader::WorkerThreadRun, this, i);
}
return HasWorkerThreads();
}
bool CustomAssetLoader::ResizeWorkerThreads(u32 num_worker_threads)
{
if (m_worker_threads.size() == num_worker_threads)
return true;
StopWorkerThreads();
return StartWorkerThreads(num_worker_threads);
}
bool CustomAssetLoader::HasWorkerThreads() const
{
return !m_worker_threads.empty();
}
void CustomAssetLoader::StopWorkerThreads()
{
if (!HasWorkerThreads())
return;
// Signal worker threads to stop, and wake all of them.
{
std::lock_guard guard(m_assets_to_load_lock);
m_exit_flag.Set();
m_worker_thread_wake.notify_all();
}
// Wait for worker threads to exit.
for (std::thread& thr : m_worker_threads)
thr.join();
m_worker_threads.clear();
m_exit_flag.Clear();
}
void CustomAssetLoader::WorkerThreadRun(u32 thread_index)
{
Common::SetCurrentThreadName(fmt::format("Asset Loader {}", thread_index).c_str());
std::unique_lock load_lock(m_assets_to_load_lock);
while (true)
{
m_worker_thread_wake.wait(load_lock,
[&] { return !m_assets_to_load.empty() || m_exit_flag.IsSet(); });
if (m_exit_flag.IsSet())
return;
// If more memory than allowed has already been loaded, we will load nothing more
// until the next ScheduleAssetsToLoad from Manager.
if (m_change_in_memory > m_allowed_memory)
{
m_assets_to_load.clear();
continue;
}
auto* const item = m_assets_to_load.front();
m_assets_to_load.pop_front();
// Make sure another thread isn't loading this handle.
if (!m_handles_in_progress.insert(item->GetHandle()).second)
continue;
load_lock.unlock();
// Unload previously loaded asset.
m_change_in_memory -= item->Unload();
const std::size_t bytes_loaded = item->Load();
m_change_in_memory += s64(bytes_loaded);
load_lock.lock();
{
INFO_LOG_FMT(VIDEO, "CustomAssetLoader thread {} loaded: {} ({})", thread_index,
item->GetAssetId(), UICommon::FormatSize(bytes_loaded));
std::lock_guard lk{m_assets_loaded_lock};
m_asset_handles_loaded.emplace_back(item->GetHandle(), bytes_loaded > 0);
// Make sure no other threads try to re-process this item.
// Manager will take the handles and re-ScheduleAssetsToLoad based on timestamps if needed.
std::erase(m_assets_to_load, item);
}
m_handles_in_progress.erase(item->GetHandle());
}
}
auto CustomAssetLoader::TakeLoadResults() -> LoadResults
{
std::lock_guard guard(m_assets_loaded_lock);
return {std::move(m_asset_handles_loaded), m_change_in_memory.exchange(0)};
}
void CustomAssetLoader::ScheduleAssetsToLoad(std::list<CustomAsset*> assets_to_load,
u64 allowed_memory)
{
if (assets_to_load.empty()) [[unlikely]]
return;
// There's new assets to process, notify worker threads
std::lock_guard guard(m_assets_to_load_lock);
m_allowed_memory = allowed_memory;
m_assets_to_load = std::move(assets_to_load);
m_worker_thread_wake.notify_all();
}
void CustomAssetLoader::Reset(bool restart_worker_threads)
{
const std::size_t worker_thread_count = m_worker_threads.size();
StopWorkerThreads();
m_assets_to_load.clear();
m_asset_handles_loaded.clear();
m_allowed_memory = 0;
m_change_in_memory = 0;
if (restart_worker_threads)
{
StartWorkerThreads(static_cast<u32>(worker_thread_count));
}
}
} // namespace VideoCommon
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