Working on loading

src/render/TextureManager.cpp

@@ -553,4 +553,26 @@ namespace FRG
 		textureMap.clear();
 	}
 
+	void TextureManager::MarkAllResident()
+	{
+		for (const auto& [key, tex] : textureMap) residentKeys.insert(key);
+	}
+
+	void TextureManager::UnloadNonResident(const std::string& residentPrefix)
+	{
+		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);
+			if (keep) {
+				++it;
+			}
+			else {
+				it = textureMap.erase(it);
+				++unloaded;
+			}
+		}
+		logger() << "Unloaded " << unloaded << " non-resident textures" << std::endl;
+	}
+
 }