From c93940c6ee8194fa48663b9bcd0f153c9d72a3ea Mon Sep 17 00:00:00 2001
From: iwubcode <iwubcode@users.noreply.github.com>
Date: Fri, 2 Jun 2023 14:43:28 -0500
Subject: VideoCommon: add multithreaded asset loader and define a texture
 asset

---
 .../Core/VideoCommon/Assets/CustomAssetLoader.cpp  | 93 ++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 Source/Core/VideoCommon/Assets/CustomAssetLoader.cpp

(limited to 'Source/Core/VideoCommon/Assets/CustomAssetLoader.cpp')

diff --git a/Source/Core/VideoCommon/Assets/CustomAssetLoader.cpp b/Source/Core/VideoCommon/Assets/CustomAssetLoader.cpp
new file mode 100644
index 0000000000..d2189e655b
--- /dev/null
+++ b/Source/Core/VideoCommon/Assets/CustomAssetLoader.cpp
@@ -0,0 +1,93 @@
+// Copyright 2023 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "VideoCommon/Assets/CustomAssetLoader.h"
+
+#include "Common/Logging/Log.h"
+#include "Common/MemoryUtil.h"
+#include "VideoCommon/Assets/CustomAssetLibrary.h"
+
+namespace VideoCommon
+{
+void CustomAssetLoader::Init()
+{
+  m_asset_monitor_thread_shutdown.Clear();
+
+  const size_t sys_mem = Common::MemPhysical();
+  const size_t recommended_min_mem = 2 * size_t(1024 * 1024 * 1024);
+  // keep 2GB memory for system stability if system RAM is 4GB+ - use half of memory in other cases
+  m_max_memory_available =
+      (sys_mem / 2 < recommended_min_mem) ? (sys_mem / 2) : (sys_mem - recommended_min_mem);
+
+  m_asset_monitor_thread = std::thread([this]() {
+    Common::SetCurrentThreadName("Asset monitor");
+    while (true)
+    {
+      if (m_asset_monitor_thread_shutdown.IsSet())
+      {
+        break;
+      }
+
+      std::this_thread::sleep_for(TIME_BETWEEN_ASSET_MONITOR_CHECKS);
+
+      std::lock_guard lk(m_assets_lock);
+      for (auto& [asset_id, asset_to_monitor] : m_assets_to_monitor)
+      {
+        if (auto ptr = asset_to_monitor.lock())
+        {
+          const auto write_time = ptr->GetLastWriteTime();
+          if (write_time > ptr->GetLastLoadedTime())
+          {
+            (void)ptr->Load();
+          }
+        }
+      }
+    }
+  });
+
+  m_asset_load_thread.Reset("Custom Asset Loader", [this](std::weak_ptr<CustomAsset> asset) {
+    if (auto ptr = asset.lock())
+    {
+      if (ptr->Load())
+      {
+        if (m_max_memory_available >= m_total_bytes_loaded + ptr->GetByteSizeInMemory())
+        {
+          m_total_bytes_loaded += ptr->GetByteSizeInMemory();
+
+          std::lock_guard lk(m_assets_lock);
+          m_assets_to_monitor.try_emplace(ptr->GetAssetId(), ptr);
+        }
+        else
+        {
+          ERROR_LOG_FMT(VIDEO, "Failed to load asset {} because there was not enough memory.",
+                        ptr->GetAssetId());
+        }
+      }
+    }
+  });
+}
+
+void CustomAssetLoader ::Shutdown()
+{
+  m_asset_load_thread.Shutdown(true);
+
+  m_asset_monitor_thread_shutdown.Set();
+  m_asset_monitor_thread.join();
+  m_assets_to_monitor.clear();
+  m_total_bytes_loaded = 0;
+}
+
+std::shared_ptr<RawTextureAsset>
+CustomAssetLoader::LoadTexture(const CustomAssetLibrary::AssetID& asset_id,
+                               std::shared_ptr<CustomAssetLibrary> library)
+{
+  return LoadOrCreateAsset<RawTextureAsset>(asset_id, m_textures, std::move(library));
+}
+
+std::shared_ptr<GameTextureAsset>
+CustomAssetLoader::LoadGameTexture(const CustomAssetLibrary::AssetID& asset_id,
+                                   std::shared_ptr<CustomAssetLibrary> library)
+{
+  return LoadOrCreateAsset<GameTextureAsset>(asset_id, m_game_textures, std::move(library));
+}
+}  // namespace VideoCommon
-- 
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