From a387b06738177ec0b1cbf8d0d8f5e1c43212f953 Mon Sep 17 00:00:00 2001
From: Kurt Himebauch <136133082+xXJSONDeruloXx@users.noreply.github.com>
Date: Sun, 6 Sep 2026 11:15:38 -0400
Subject: fix: detect legacy Lossless Scaling branch

---
 py_modules/lsfg_vk/dll_detection.py | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'py_modules/lsfg_vk')

diff --git a/py_modules/lsfg_vk/dll_detection.py b/py_modules/lsfg_vk/dll_detection.py
index f7ba444..592d170 100644
--- a/py_modules/lsfg_vk/dll_detection.py
+++ b/py_modules/lsfg_vk/dll_detection.py
@@ -46,6 +46,16 @@ class DllDetectionService(BaseService):
             steam_libraries_path = self._check_steam_library_folders()
             if steam_libraries_path:
                 return steam_libraries_path
+
+            legacy_dll = self._check_legacy_dll()
+            if legacy_dll:
+                return {
+                    "detected": False,
+                    "path": None,
+                    "source": str(legacy_dll),
+                    "message": "Lossless Scaling found. Switch it to the \"lsfg-vk\" branch in Steam.",
+                    "error": None
+                }
             
             return {
                 "detected": False,
@@ -66,6 +76,13 @@ class DllDetectionService(BaseService):
                 "error": str(e)
             }
     
+    def _check_legacy_dll(self) -> Path | None:
+        for library_path in self._get_steam_library_paths():
+            dll_path = Path(library_path) / STEAM_COMMON_PATH / "Lossless.dll"
+            if dll_path.exists():
+                return dll_path
+        return None
+
     def _check_env_dll_path(self) -> DllDetectionResponse | None:
         """Check LSFG_DLL_PATH environment variable
         
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