/* utility function used to modify a tile */

void CDECL ModifyTile(TileIndex tile, uint flags, ...)

{

	va_list va;

	int i;

	va_start(va, flags);

	if ((i = GB(flags, 8, 4)) != 0) {

		SetTileType(tile, i - 1);

	}

	if (flags & (MP_MAP2_CLEAR | MP_MAP2)) {

		int x = 0;

		if (flags & MP_MAP2) x = va_arg(va, int);

		_m[tile].m2 = x;

	}

	if (flags & (MP_MAP3LO_CLEAR | MP_MAP3LO)) {

		int x = 0;

		if (flags & MP_MAP3LO) x = va_arg(va, int);

		_m[tile].m3 = x;

	}

	if (flags & (MP_MAP3HI_CLEAR | MP_MAP3HI)) {

		int x = 0;

		if (flags & MP_MAP3HI) x = va_arg(va, int);

		_m[tile].m4 = x;

	}

	if (flags & (MP_MAPOWNER|MP_MAPOWNER_CURRENT)) {

		PlayerID x = _current_player;

		if (flags & MP_MAPOWNER) x = va_arg(va, int);

		_m[tile].m1 = x;

	}

	if (flags & MP_MAP5) {

		_m[tile].m5 = va_arg(va, int);

	}

	va_end(va);

	if (!(flags & MP_NODIRTY))

		MarkTileDirtyByTile(tile);

}