uniquake/Assets/Scripts/UniQuake.cs

using System;
using System.Runtime.InteropServices;
using UnityEngine;

public class UniQuake: MonoBehaviour
{
    private const string DllName = "uniquake.dll";
    private const int MemSize = 0x4000000;  // 64 MB of heap space

    private QuakeParms quakeParms;
    private SysCalls sysCalls;

    void Start()
    {
        string[] arguments = 
        {
            "",
            "-window",
            "-width", "1440",
            "-height", "1080",
        };

        quakeParms = new QuakeParms
        {
            baseDir = Application.persistentDataPath,
            cacheDir = null,
        };
        quakeParms.SetArguments(arguments);
        quakeParms.AllocateMemory(MemSize);

        sysCalls = new SysCalls(this);

        UniQuake_Init(sysCalls.CallbacksPtr, sysCalls.SelfPtr, quakeParms);
    }

    void Update()
    {
        UniQuake_Update(Time.deltaTime);
    }

    private void OnDestroy()
    {
        sysCalls.Destroy();

        if (quakeParms != null)
        {
            quakeParms.Destroy();
            quakeParms = null;
        }
    }

    [DllImport(DllName, CallingConvention = CallingConvention.Cdecl)]
    private static extern void UniQuake_Init(IntPtr callbacks, IntPtr callbackTarget, QuakeParms parms);

    [DllImport(DllName, CallingConvention = CallingConvention.Cdecl)]
    private static extern void UniQuake_Update(float deltaTime);
}