Emscripten: Fix assets/ loading

CMake/platforms/emscripten.cmake

@@ -1,4 +1,5 @@
 set(BUILD_TESTING OFF)
+set(BUILD_ASSETS_MPQ OFF)
 set(DISABLE_ZERO_TIER ON)
 set(DEVILUTIONX_SYSTEM_SDL_AUDIOLIB OFF)
 set(DEVILUTIONX_SYSTEM_LIBSODIUM OFF)

CMakeLists.txt

@@ -448,6 +448,10 @@ else()
 endif()
 target_link_libraries(${BIN_TARGET} PRIVATE libdevilutionx)
 
+if(EMSCRIPTEN)
+  target_link_options(${BIN_TARGET} PRIVATE --preload-file assets)
+endif()
+
 if(BUILD_TESTING)
   if(ENABLE_CODECOVERAGE)
     if(CMAKE_CXX_COMPILER_ID MATCHES "MSVC")

Source/utils/paths.cpp

@@ -91,7 +91,11 @@ const std::string &ConfigPath()
 const std::string &AssetsPath()
 {
 	if (!assetsPath)
+#if __EMSCRIPTEN__
+		assetsPath.emplace("assets/");
+#else
 		assetsPath.emplace(FromSDL(SDL_GetBasePath()) + "assets/");
+#endif
 	return *assetsPath;
 }