VideoCommon: add multithreaded asset loader and define a texture asset

Source/Core/VideoCommon/Assets/TextureAsset.h

@@ -0,0 +1,32 @@
+// Copyright 2023 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "VideoCommon/Assets/CustomAsset.h"
+#include "VideoCommon/Assets/CustomTextureData.h"
+
+namespace VideoCommon
+{
+class RawTextureAsset final : public CustomLoadableAsset<CustomTextureData>
+{
+public:
+  using CustomLoadableAsset::CustomLoadableAsset;
+
+private:
+  CustomAssetLibrary::LoadInfo LoadImpl(const CustomAssetLibrary::AssetID& asset_id) override;
+};
+
+class GameTextureAsset final : public CustomLoadableAsset<CustomTextureData>
+{
+public:
+  using CustomLoadableAsset::CustomLoadableAsset;
+
+  // Validates that the game texture matches the native dimensions provided
+  // Callees are expected to call this once the data is loaded
+  bool Validate(u32 native_width, u32 native_height) const;
+
+private:
+  CustomAssetLibrary::LoadInfo LoadImpl(const CustomAssetLibrary::AssetID& asset_id) override;
+};
+}  // namespace VideoCommon