working on refactoring

src/render/TextureManager.cpp

@@ -558,12 +558,11 @@ namespace FRG
 		for (const auto& [key, tex] : textureMap) residentKeys.insert(key);
 	}
 
-	void TextureManager::UnloadNonResident(const std::string& residentPrefix)
+	void TextureManager::UnloadUnused()
 	{
 		size_t unloaded = 0;
 		for (auto it = textureMap.begin(); it != textureMap.end(); ) {
-			const bool keep = residentKeys.count(it->first)
-				|| (!residentPrefix.empty() && it->first.compare(0, residentPrefix.size(), residentPrefix) == 0);
+			const bool keep = residentKeys.count(it->first) || it->second.use_count() > 1;
 			if (keep) {
 				++it;
 			}
@@ -572,7 +571,7 @@ namespace FRG
 				++unloaded;
 			}
 		}
-		logger() << "Unloaded " << unloaded << " non-resident textures" << std::endl;
+		logger() << "Unloaded " << unloaded << " unused textures" << std::endl;
 	}
 
 }