Add GOG installation paths to game data search paths (fixes #2709) (#2748)

3rdParty/find_steam_game/CMakeLists.txt

@@ -0,0 +1,11 @@
+include(FetchContent_MakeAvailableExcludeFromAll)
+
+include(FetchContent)
+FetchContent_Declare(find_steam_game
+    URL https://github.com/cxong/find_steam_game/archive/94e9046bcf94a655bdc051b6e6662fabd18e3f30.zip
+    URL_HASH MD5=c2742aff3d2a2dd162200fdab1b2b4a4
+)
+FetchContent_MakeAvailableExcludeFromAll(find_steam_game)
+
+add_library(find_steam_game INTERFACE)
+target_include_directories(find_steam_game INTERFACE ${find_steam_game_SOURCE_DIR})

CMakeLists.txt

@@ -290,6 +290,10 @@ add_library(smacker STATIC
   3rdParty/libsmacker/smacker.c)
 target_include_directories(smacker PUBLIC 3rdParty/libsmacker)
 
+if(WIN32)
+add_subdirectory(3rdParty/find_steam_game)
+endif()
+
 add_subdirectory(3rdParty/simpleini)
 
 add_library(StormLib STATIC
@@ -645,6 +649,10 @@ target_link_libraries(libdevilutionx PUBLIC
   smacker
   simpleini)
 
+if(WIN32)
+  target_link_libraries(libdevilutionx PUBLIC find_steam_game)
+endif()
+
 if(NOT NONET)
   if(NOT DISABLE_TCP)
     target_link_libraries(libdevilutionx PUBLIC asio)

Source/init.cpp

@@ -8,6 +8,10 @@
 #include <string>
 #include <vector>
 
+#if defined(_WIN64) || defined(_WIN32)
+#include <find_steam_game.h>
+#endif
+
 #include "DiabloUI/diabloui.h"
 #include "dx.h"
 #include "pfile.h"
@@ -148,6 +152,13 @@ void init_archives()
 	paths.emplace_back("/usr/local/share/diasurgical/devilutionx/");
 #elif defined(__3DS__)
 	paths.emplace_back("romfs:/");
+#elif defined(_WIN64) || defined(_WIN32)
+	char gogpath[_FSG_PATH_MAX];
+	fsg_get_gog_game_path(gogpath, "1412601690");
+	if (strlen(gogpath) > 0) {
+		paths.emplace_back(std::string(gogpath) + "/");
+		paths.emplace_back(std::string(gogpath) + "/hellfire/");
+	}
 #endif
 
 	paths.emplace_back(""); // PWD