OMG/Assets/Scripts/PlayerMovement.cs

using System;
using UnityEngine;
using UnityEngine.InputSystem;

public class PlayerMovement : MonoBehaviour
{
    private InputMaster _inputMaster;
    [SerializeField] private CharacterController controller;
    [SerializeField] private float speed;
    [SerializeField] private Transform groundCheck;
    private float _groundDistance = 0.4f;
    [SerializeField] private LayerMask groundMask;
    
    private Vector2 _moveDirection;
    private Vector3 _velocity;
    private readonly float _gravity = -9.81f * 2f;
    private bool _isGrounded;

    private float _jumpHeight = 3f;

    private void Awake()
    {
        controller = GetComponent<CharacterController>();
        _inputMaster = new InputMaster();
        _inputMaster.Player.Move.Enable();
        _inputMaster.Player.Jump.Enable();
    }

    private void Update()
    {
        _isGrounded = Physics.CheckSphere(groundCheck.position, _groundDistance, groundMask);
        if (_isGrounded && _velocity.y < 0)
        {
            _velocity.y = -2f; //force player on the ground
        }
        
        _moveDirection = _inputMaster.Player.Move.ReadValue<Vector2>();
        Vector3 move = transform.right * _moveDirection.x + transform.forward * _moveDirection.y;
        controller.Move(move * (speed * Time.deltaTime));
        
        _velocity.y += _gravity * Time.deltaTime;
        controller.Move(_velocity * Time.deltaTime); // multiply again because of m/s^2
    }

    public void Jump(InputAction.CallbackContext context)
    {
        if (context.performed)
        {
            if (_isGrounded)
            {
                _velocity.y = (float)Math.Sqrt(_jumpHeight * -2f * _gravity);
            }
        }
    }

    private void OnDisable()
    {
        _inputMaster.Player.Move.Disable();
        _inputMaster.Player.Jump.Disable();
    }
}