From 5a83733329cb1a7192392fc46528b96dd9278db6 Mon Sep 17 00:00:00 2001
From: Ian Ling <ian@iancaling.com>
Date: Sat, 15 Nov 2025 21:46:11 -0800
Subject: [PATCH] Add config option allowing map loader to prefer RPG Maker
 files

---
 src/game_config.cpp |  2 ++
 src/game_config.h   |  1 +
 src/game_map.cpp    | 33 ++++++++++++++++-----------------
 3 files changed, 19 insertions(+), 17 deletions(-)

diff --git a/src/game_config.cpp b/src/game_config.cpp
index da57f786ed..4f94cb7098 100644
--- a/src/game_config.cpp
+++ b/src/game_config.cpp
@@ -683,6 +683,7 @@ void Game_Config::LoadFromStream(Filesystem_Stream::InputStream& is) {
 	player.screenshot_timestamp.FromIni(ini);
 	player.automatic_screenshots.FromIni(ini);
 	player.automatic_screenshots_interval.FromIni(ini);
+	player.prefer_easyrpg_map_files.FromIni(ini);
 }
 
 void Game_Config::WriteToStream(Filesystem_Stream::OutputStream& os) const {
@@ -776,6 +777,7 @@ void Game_Config::WriteToStream(Filesystem_Stream::OutputStream& os) const {
 	player.screenshot_timestamp.ToIni(os);
 	player.automatic_screenshots.ToIni(os);
 	player.automatic_screenshots_interval.ToIni(os);
+	player.prefer_easyrpg_map_files.ToIni(os);
 
 	os << "\n";
 }
diff --git a/src/game_config.h b/src/game_config.h
index 271e573972..bfcddde403 100644
--- a/src/game_config.h
+++ b/src/game_config.h
@@ -108,6 +108,7 @@ struct Game_ConfigPlayer {
 	BoolConfigParam screenshot_timestamp{ "Screenshot timestamp", "Add the current date and time to the file name", "Player", "ScreenshotTimestamp", true };
 	BoolConfigParam automatic_screenshots{ "Automatic screenshots", "Periodically take screenshots", "Player", "AutomaticScreenshots", false };
 	RangeConfigParam<int> automatic_screenshots_interval{ "Screenshot interval", "The interval between automatic screenshots (seconds)", "Player", "AutomaticScreenshotsInterval", 30, 1, 999999 };
+	BoolConfigParam prefer_easyrpg_map_files{ "Prefer EasyRPG map files", "Attempt to load EasyRPG map files (.emu) first and fall back to RPG Maker map files (.lmu)", "Player", "PreferEasyRpgMapFiles", true };
 
 	void Hide();
 };
diff --git a/src/game_map.cpp b/src/game_map.cpp
index d2363e6a98..ca49966eb8 100644
--- a/src/game_map.cpp
+++ b/src/game_map.cpp
@@ -325,40 +325,39 @@ void Game_Map::SetupFromSave(
 std::unique_ptr<lcf::rpg::Map> Game_Map::LoadMapFile(int map_id) {
 	std::unique_ptr<lcf::rpg::Map> map;
 
-	// Try loading EasyRPG map files first, then fallback to normal RPG Maker
+	// Attempt to load either the EasyRPG map file or the RPG Maker map file first, depending on config.
+	// If it fails, try the other one.
 	// FIXME: Assert map was cached for async platforms
-	std::string map_name = Game_Map::ConstructMapName(map_id, true);
+	bool map_is_easyrpg_file = Player::player_config.prefer_easyrpg_map_files.Get();
+	std::string map_name = Game_Map::ConstructMapName(map_id, map_is_easyrpg_file);
 	std::string map_file = FileFinder::Game().FindFile(map_name);
 	if (map_file.empty()) {
-		map_name = Game_Map::ConstructMapName(map_id, false);
+		map_is_easyrpg_file = !map_is_easyrpg_file;
+		map_name = Game_Map::ConstructMapName(map_id, map_is_easyrpg_file);
 		map_file = FileFinder::Game().FindFile(map_name);
 
 		if (map_file.empty()) {
 			Output::Error("Loading of Map {} failed.\nThe map was not found.", map_name);
 			return nullptr;
 		}
+	}
 
-		auto map_stream = FileFinder::Game().OpenInputStream(map_file);
-		if (!map_stream) {
-			Output::Error("Loading of Map {} failed.\nMap not readable.", map_name);
-			return nullptr;
-		}
+	auto map_stream = FileFinder::Game().OpenInputStream(map_file);
+	if (!map_stream) {
+		Output::Error("Loading of Map {} failed.\nMap not readable.", map_name);
+		return nullptr;
+	}
 
+	if (map_is_easyrpg_file) {
+		map = lcf::LMU_Reader::LoadXml(map_stream);
+	} else {
 		map = lcf::LMU_Reader::Load(map_stream, Player::encoding);
-
 		if (Input::IsRecording()) {
 			map_stream.clear();
 			map_stream.seekg(0);
 			Input::AddRecordingData(Input::RecordingData::Hash,
-						   fmt::format("map{:04} {:#08x}", map_id, Utils::CRC32(map_stream)));
+							fmt::format("map{:04} {:#08x}", map_id, Utils::CRC32(map_stream)));
 		}
-	} else {
-		auto map_stream = FileFinder::Game().OpenInputStream(map_file);
-		if (!map_stream) {
-			Output::Error("Loading of Map {} failed.\nMap not readable.", map_name);
-			return nullptr;
-		}
-		map = lcf::LMU_Reader::LoadXml(map_stream);
 	}
 
 	Output::Debug("Loaded Map {}", map_name);