VideoCommon: introduce linked assets in TCacheEntry, allowing for assets to be reloaded

Source/Core/VideoCommon/TextureCacheBase.cpp

@@ -272,6 +272,15 @@ void TextureCacheBase::SetBackupConfig(const VideoConfig& config)
       config.graphics_mod_config ? config.graphics_mod_config->GetChangeCount() : 0;
 }
 
+bool TextureCacheBase::DidLinkedAssetsChange(const TCacheEntry& entry)
+{
+  if (!entry.linked_asset.m_asset)
+    return false;
+
+  const auto last_asset_write_time = entry.linked_asset.m_asset->GetLastLoadedTime();
+  return last_asset_write_time > entry.linked_asset.m_last_write_time;
+}
+
 RcTcacheEntry TextureCacheBase::ApplyPaletteToEntry(RcTcacheEntry& entry, const u8* palette,
                                                     TLUTFormat tlutfmt)
 {
@@ -1271,9 +1280,26 @@ private:
 };
 
 TCacheEntry* TextureCacheBase::Load(const TextureInfo& texture_info)
+{
+  if (auto entry = LoadImpl(texture_info, false))
+  {
+    if (!DidLinkedAssetsChange(*entry))
+    {
+      return entry;
+    }
+
+    InvalidateTexture(GetTexCacheIter(entry));
+    return LoadImpl(texture_info, true);
+  }
+
+  return nullptr;
+}
+
+TCacheEntry* TextureCacheBase::LoadImpl(const TextureInfo& texture_info, bool force_reload)
 {
   // if this stage was not invalidated by changes to texture registers, keep the current texture
-  if (TMEM::IsValid(texture_info.GetStage()) && bound_textures[texture_info.GetStage()])
+  if (!force_reload && TMEM::IsValid(texture_info.GetStage()) &&
+      bound_textures[texture_info.GetStage()])
   {
     TCacheEntry* entry = bound_textures[texture_info.GetStage()].get();
     // If the TMEM configuration is such that this texture is more or less guaranteed to still
@@ -1582,6 +1608,7 @@ RcTcacheEntry TextureCacheBase::GetTexture(const int textureCacheSafetyColorSamp
     InvalidateTexture(oldest_entry);
   }
 
+  CachedTextureAsset cached_texture_asset;
   std::shared_ptr<VideoCommon::CustomTextureData> data = nullptr;
   bool has_arbitrary_mipmaps = false;
   std::shared_ptr<HiresTexture> hires_texture;
@@ -1591,6 +1618,8 @@ RcTcacheEntry TextureCacheBase::GetTexture(const int textureCacheSafetyColorSamp
     if (hires_texture)
     {
       data = hires_texture->GetAsset()->GetData();
+      cached_texture_asset = {hires_texture->GetAsset(),
+                              hires_texture->GetAsset()->GetLastLoadedTime()};
       has_arbitrary_mipmaps = hires_texture->HasArbitraryMipmaps();
       if (data)
       {
@@ -1603,9 +1632,11 @@ RcTcacheEntry TextureCacheBase::GetTexture(const int textureCacheSafetyColorSamp
     }
   }
 
-  return CreateTextureEntry(
+  auto entry = CreateTextureEntry(
       TextureCreationInfo{base_hash, full_hash, bytes_per_block, palette_size}, texture_info,
       textureCacheSafetyColorSampleSize, data.get(), has_arbitrary_mipmaps);
+  entry->linked_asset = std::move(cached_texture_asset);
+  return entry;
 }
 
 RcTcacheEntry TextureCacheBase::CreateTextureEntry(

Source/Core/VideoCommon/TextureCacheBase.h

@@ -4,6 +4,7 @@
 #pragma once
 
 #include <array>
+#include <filesystem>
 #include <fmt/format.h>
 #include <map>
 #include <memory>
@@ -35,7 +36,8 @@ struct VideoConfig;
 namespace VideoCommon
 {
 class CustomTextureData;
-}
+class GameTextureAsset;
+}  // namespace VideoCommon
 
 constexpr std::string_view EFB_DUMP_PREFIX = "efb1";
 constexpr std::string_view XFB_DUMP_PREFIX = "xfb1";
@@ -113,6 +115,12 @@ struct fmt::formatter<EFBCopyParams>
   }
 };
 
+struct CachedTextureAsset
+{
+  std::shared_ptr<VideoCommon::GameTextureAsset> m_asset;
+  std::optional<std::filesystem::file_time_type> m_last_write_time;
+};
+
 struct TCacheEntry
 {
   // common members
@@ -164,6 +172,8 @@ struct TCacheEntry
 
   std::string texture_info_name = "";
 
+  CachedTextureAsset linked_asset;
+
   explicit TCacheEntry(std::unique_ptr<AbstractTexture> tex,
                        std::unique_ptr<AbstractFramebuffer> fb);
 
@@ -337,6 +347,10 @@ private:
 
   using TexPool = std::unordered_multimap<TextureConfig, TexPoolEntry>;
 
+  static bool DidLinkedAssetsChange(const TCacheEntry& entry);
+
+  TCacheEntry* LoadImpl(const TextureInfo& texture_info, bool force_reload);
+
   bool CreateUtilityTextures();
 
   void SetBackupConfig(const VideoConfig& config);