LowPolyFPS/Assets/Scripts/PlayerController.cs

using UnityEngine;
using UnityEngine.InputSystem;

[RequireComponent(typeof(CharacterController))]
public class PlayerController : MonoBehaviour
{
    [Header("Movement Settings")]
    [SerializeField] private float walkSpeed = 5.0f;
    [SerializeField] private float sprintSpeed = 8.5f;
    [SerializeField] private float gravity = -19.62f;
    [SerializeField] private float jumpHeight = 1.2f;

    [Header("Look Settings")]
    [SerializeField] private Transform cameraHolder;
    [SerializeField] private float mouseSensitivity = 2.0f;
    [SerializeField] private float upDownLookLimit = 80.0f;

    private CharacterController characterController;
    private Vector3 velocity;
    private Vector2 moveInput;
    private Vector2 lookInput;
    private float verticalRotation = 0f;
    private bool isSprinting;
    private bool jumpRequested;

    private void Awake()
    {
        characterController = GetComponent<CharacterController>();
        Cursor.lockState = CursorLockMode.Locked;
        Cursor.visible = false;
    }

    private void Update()
    {
        HandleRotation();
        HandleMovement();
    }

    public void OnMove(InputValue value) => moveInput = value.Get<Vector2>();
    public void OnLook(InputValue value) => lookInput = value.Get<Vector2>();
    public void OnSprint(InputValue value) => isSprinting = value.isPressed;
    public void OnJump(InputValue value)
    {
        if (value.isPressed && characterController.isGrounded)
            jumpRequested = true;
    }

    private void HandleRotation()
    {
        if (cameraHolder == null) return;

        float mouseX = lookInput.x * mouseSensitivity * 0.1f;
        float mouseY = lookInput.y * mouseSensitivity * 0.1f;

        transform.Rotate(Vector3.up * mouseX);

        verticalRotation -= mouseY;
        verticalRotation = Mathf.Clamp(verticalRotation, -upDownLookLimit, upDownLookLimit);
        cameraHolder.localRotation = Quaternion.Euler(verticalRotation, 0f, 0f);
    }

    private void HandleMovement()
    {
        if (characterController.isGrounded && velocity.y < 0)
        {
            velocity.y = -2f;
        }

        float currentSpeed = isSprinting ? sprintSpeed : walkSpeed;
        Vector3 moveDirection = transform.right * moveInput.x + transform.forward * moveInput.y;
        characterController.Move(moveDirection * currentSpeed * Time.deltaTime);

        if (jumpRequested)
        {
            velocity.y = Mathf.Sqrt(jumpHeight * -2f * gravity);
            jumpRequested = false;
        }

        velocity.y += gravity * Time.deltaTime;
        characterController.Move(velocity * Time.deltaTime);
    }

    public void SetCameraHolder(Transform camHolder) => cameraHolder = camHolder;
}