UniformAim/TarkovUniformAim/UniformAimPlugin.cs

using BepInEx;
using BepInEx.Configuration;
using System;
using UnityEngine;

namespace UniformAim
{
    [BepInPlugin("com.greg.tarkovuniformaim", "Uniform Aim for Tarkov", "1.0.0")]
    [BepInProcess("EscapeFromTarkov.exe")]

    public class Plugin : BaseUnityPlugin
    {
        //Bepinex.Configurator fields
        public static ConfigEntry<int> configFOV;
        public static ConfigEntry<int> configCoeff;
        public static ConfigEntry<int> configSens;
        public static ConfigEntry<bool> configEnableLogging;

        //TODO: figure out a way to read game settings to default the configFOV.Value to whatever the player has already set
        //TODO: figure out a way to read game settings to apply configSens.Value as a multiplier on top of Tarkov's stock sensitivity setting

        public static float mySens = 1f;
        public static float aimingSens;

        //sight data for hacky workarounds
        public static int SelectedScope = 0;
        public static int SelectedScopeMode = 0;
        public static bool isAiming = false;

        //human-friendly names for variables used later
        float FPSCameraFOV;
        float ScopeFOV;
        float currentFOV;
        //so we don't keep repeating ourselves
        float cachedFOV;
        string cachedDebugInfo;

        //Return aspect ratio based on game window resolution, currently unused but could be useful in the future
        float GetAspectRatio()
        {
            string screenWidth = Screen.width.ToString();
            string screenHeight = Screen.height.ToString();
            float resX = Convert.ToUInt16(screenWidth);
            float resY = Convert.ToUInt16(screenHeight);

            //Logger.LogInfo("GetAspectRatio(): resX: " + resX + " resY: " + resY);
            return (resX / resY);
        }
        //calculate horizontal FOV based on vertical FOV, currently unused but could be useful in the future
        float CalculateHFOV(float FOV)
        {
            float vFOVRad = FOV * Mathf.Deg2Rad;
            float hFOVRad = (float)(2 * Math.Atan(Math.Tan(FOV / 2) * Mathf.Deg2Rad) * GetAspectRatio());

            return (float)(Math.Round(hFOVRad * Mathf.Rad2Deg));
        }
        //calculate sensitivity based on FOV difference and coefficient
        float CalculateSensitivity(float aimedFOV, float hipFOV)
        {   //clamp to avoid invalid values
            aimedFOV = Mathf.Clamp(aimedFOV, 1f, 76f);
            hipFOV = Mathf.Clamp(hipFOV, 1f, 75f);

            //halve the angle and convert to radians
            aimedFOV = (aimedFOV / 2f) * Mathf.Deg2Rad;
            hipFOV = (hipFOV / 2f) * Mathf.Deg2Rad;

            float exponent = (float)(100f / configCoeff.Value);

            float tanRatio = (float)(Math.Tan(aimedFOV) / Math.Tan(hipFOV));

            float sensitivity = configSens.Value / 100f;

            float result = (float)Math.Pow(tanRatio, exponent) * sensitivity;

            return result;
        }

        //determine if the player is looking through the scope
        bool isScopeCameraActive()
        {
            if (Camera.allCamerasCount > 1) { return Camera.allCameras[1].GetComponent<Behaviour>().isActiveAndEnabled; }
            return false;
        }

        //determine the correct FOV for calculations
        void DetermineCurrentFOV()
        {
            if (SelectedScope == 0 && isScopeCameraActive()) { currentFOV = ScopeFOV; } else {currentFOV = FPSCameraFOV; }
            
            //if (isScopeCameraActive())
            //{
            //    if (SelectedScope == 0)
            //    {
            //        currentFOV = ScopeFOV; //Logger.LogInfo("Updating currentFOV to ScopeFOV"); 
            //    }
            //    if (SelectedScope != 0)
            //    {
            //        currentFOV = FPSCameraFOV; //Logger.LogInfo("Updating currentFOV to FPSCameraFOV"); 
            //    }
            //}
            //else
            //{
            //    //Logger.LogInfo("Updating currentFOV to FPSCameraFOV");
            //    currentFOV = FPSCameraFOV;
            //}
        }

        void LogDebugInfo()
        {
            //preformatted debug info string
            string currentDebugInfo = $"Current FOV: {currentFOV} FPS Camera FOV: {FPSCameraFOV} Scope FOV: {ScopeFOV} Cached FOV: {cachedFOV} Sens: {mySens} SelectedScope: {SelectedScope}";

            //only output currentDebugInfo if there were any changes
            if (currentDebugInfo != cachedDebugInfo) 
            { 
                Logger.LogInfo(currentDebugInfo); cachedDebugInfo = currentDebugInfo; 
            }
            
        }

        void Awake()
        {
            new UpdateSensitivityPatch().Enable();
            new get_AimingSensitivityPatch().Enable();
            new get_SelectedScopeIndexPatch().Enable();
            new get_SelectedScopeModePatch().Enable();
            new get_IsAimingPatch().Enable();

            //add configuration slider for field of view
            configFOV = Config.Bind("General", "FOV", 75, new ConfigDescription("In-game Field of View value", new AcceptableValueRange<int>(51, 75)));

            //add coefficient slider
            configCoeff = Config.Bind("General", "Coefficient", 133, new ConfigDescription("Coefficient - increases sensitivity at higher zoom levels", new AcceptableValueRange<int>(1, 300)));

            //add sensitivity slider
            configSens = Config.Bind("General", "Sensitivity", 25, new ConfigDescription("Sensitivity while aiming", new AcceptableValueRange<int>(1, 200)));

            //enable logging
            configEnableLogging = Config.Bind("Debug", "Enable logging", false, new ConfigDescription("Enables logging in BepInEx console, extremely spammy!"));
        }


        void FixedUpdate()
        {
            //FixedUpdate() at 50Hz (Unity default) tickrate appears to resolve the issue of this script breaking when AI spawns.
            Time.fixedDeltaTime = (1f/50f);

       
            if (isAiming)
            {
                //Grab FOV values for calculation
                FPSCameraFOV = Camera.allCameras[0].fieldOfView;
                if (Camera.allCamerasCount > 1) { ScopeFOV = Camera.allCameras[1].fieldOfView; }

                //Figure out if the FPSCamera is zoomed in, prevents the script from ticking while the player is healing
                //if(FPSCameraFOV < configFOV.Value)
                if(FPSCameraFOV < 75)
                { 
                    DetermineCurrentFOV();
                    //do not update sensitivity if currentFOV hasn't changed
                    if (cachedFOV != currentFOV) { mySens = CalculateSensitivity(currentFOV, configFOV.Value); cachedFOV = currentFOV; }
                }           
            }

            //draw debug info
            if (configEnableLogging.Value) { LogDebugInfo(); }
        }
    }
}