VideoCommon: add multithreaded asset loader and define a texture asset

Source/Core/VideoCommon/Assets/TextureAsset.cpp

@@ -0,0 +1,77 @@
+// Copyright 2023 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "VideoCommon/Assets/TextureAsset.h"
+
+#include "Common/Logging/Log.h"
+
+namespace VideoCommon
+{
+CustomAssetLibrary::LoadInfo RawTextureAsset::LoadImpl(const CustomAssetLibrary::AssetID& asset_id)
+{
+  std::lock_guard lk(m_lock);
+  const auto loaded_info = m_owning_library->LoadTexture(asset_id, &m_data);
+  if (loaded_info.m_bytes_loaded == 0)
+    return {};
+  m_loaded = true;
+  return loaded_info;
+}
+
+CustomAssetLibrary::LoadInfo GameTextureAsset::LoadImpl(const CustomAssetLibrary::AssetID& asset_id)
+{
+  std::lock_guard lk(m_lock);
+  const auto loaded_info = m_owning_library->LoadGameTexture(asset_id, &m_data);
+  if (loaded_info.m_bytes_loaded == 0)
+    return {};
+  m_loaded = true;
+  return loaded_info;
+}
+
+bool GameTextureAsset::Validate(u32 native_width, u32 native_height) const
+{
+  std::lock_guard lk(m_lock);
+
+  if (!m_loaded)
+  {
+    ERROR_LOG_FMT(VIDEO,
+                  "Game texture can't be validated for asset '{}' because it is not loaded yet.",
+                  GetAssetId());
+    return false;
+  }
+
+  if (m_data.m_levels.empty())
+  {
+    ERROR_LOG_FMT(VIDEO,
+                  "Game texture can't be validated for asset '{}' because no data was available.",
+                  GetAssetId());
+    return false;
+  }
+
+  // Verify that the aspect ratio of the texture hasn't changed, as this could have
+  // side-effects.
+  const VideoCommon::CustomTextureData::Level& first_mip = m_data.m_levels[0];
+  if (first_mip.width * native_height != first_mip.height * native_width)
+  {
+    ERROR_LOG_FMT(
+        VIDEO,
+        "Invalid custom texture size {}x{} for game texture asset '{}'. The aspect differs "
+        "from the native size {}x{}.",
+        first_mip.width, first_mip.height, GetAssetId(), native_width, native_height);
+    return false;
+  }
+
+  // Same deal if the custom texture isn't a multiple of the native size.
+  if (native_width != 0 && native_height != 0 &&
+      (first_mip.width % native_width || first_mip.height % native_height))
+  {
+    ERROR_LOG_FMT(
+        VIDEO,
+        "Invalid custom texture size {}x{} for game texture asset '{}'. Please use an integer "
+        "upscaling factor based on the native size {}x{}.",
+        first_mip.width, first_mip.height, GetAssetId(), native_width, native_height);
+    return false;
+  }
+
+  return true;
+}
+}  // namespace VideoCommon