Function LoadNewGRF

src/newgrf.cpp:1758–1892

* Load all the NewGRFs. * @param load_index The offset for the first sprite to add. * @param num_baseset Number of NewGRFs at the front of the list to look up in the baseset dir instead of the newgrf dir. */

 * @param num_baseset Number of NewGRFs at the front of the list to look up in the baseset dir instead of the newgrf dir.
 */
void LoadNewGRF(SpriteID load_index, uint num_baseset)
{
	/* In case of networking we need to "sync" the start values
	 * so all NewGRFs are loaded equally. For this we use the
	 * start date of the game and we set the counters, etc. to
	 * 0 so they're the same too. */
	TimerGameCalendar::Date date            = TimerGameCalendar::date;
	TimerGameCalendar::Year year            = TimerGameCalendar::year;
	TimerGameCalendar::DateFract date_fract = TimerGameCalendar::date_fract;

	TimerGameEconomy::Date economy_date = TimerGameEconomy::date;
	TimerGameEconomy::Year economy_year = TimerGameEconomy::year;
	TimerGameEconomy::DateFract economy_date_fract = TimerGameEconomy::date_fract;

	uint64_t tick_counter  = TimerGameTick::counter;
	uint8_t display_opt     = _display_opt;

	if (_networking) {
		TimerGameCalendar::year = _settings_game.game_creation.starting_year;
		TimerGameCalendar::date = TimerGameCalendar::ConvertYMDToDate(TimerGameCalendar::year, 0, 1);
		TimerGameCalendar::date_fract = 0;

		TimerGameEconomy::year = TimerGameEconomy::Year{_settings_game.game_creation.starting_year.base()};
		TimerGameEconomy::date = TimerGameEconomy::ConvertYMDToDate(TimerGameEconomy::year, 0, 1);
		TimerGameEconomy::date_fract = 0;

		TimerGameTick::counter = 0;
		_display_opt  = 0;
	}

	InitializePatchFlags();

	ResetNewGRFData();

	/*
	 * Reset the status of all files, so we can 'retry' to load them.
	 * This is needed when one for example rearranges the NewGRFs in-game
	 * and a previously disabled NewGRF becomes usable. If it would not
	 * be reset, the NewGRF would remain disabled even though it should
	 * have been enabled.
	 */
	for (const auto &c : _grfconfig) {
		if (c->status != GCS_NOT_FOUND) c->status = GCS_UNKNOWN;
	}

	_cur_gps.spriteid = load_index;

	/* Load newgrf sprites
	 * in each loading stage, (try to) open each file specified in the config
	 * and load information from it. */
	for (GrfLoadingStage stage = GLS_LABELSCAN; stage <= GLS_ACTIVATION; stage++) {
		/* Set activated grfs back to will-be-activated between reservation- and activation-stage.
		 * This ensures that action7/9 conditions 0x06 - 0x0A work correctly. */
		for (const auto &c : _grfconfig) {
			if (c->status == GCS_ACTIVATED) c->status = GCS_INITIALISED;
		}

		if (stage == GLS_RESERVE) {