reload.d

void on_pretick(Engine* e)
{
    static if (USE_DLL)
    {
        void unload_dll()
        {
            FreeLibrary(h);
            h = null;
            main_loop = null;
            dll_ok = false;
        }

        timer -= engine.delta_time;
        if (timer <= 0)
        {
            timer = 2.0;

            WIN32_FILE_ATTRIBUTE_DATA newAttribs;
            GetFileAttributesEx("game.dll", GET_FILEEX_INFO_LEVELS.GetFileExInfoStandard, &newAttribs);
            
            if (CompareFileTime(&attribs.ftLastWriteTime, &newAttribs.ftLastWriteTime) == -1)
            {
                attribs = newAttribs;
                if (h)
                {
                    LINFO("new game.dll version, reloading..");
                    LINFO("freeing old dll..");
                    FreeLibrary(h);
                    h = null;
                    main_loop = null;
                }

                LINFO("loading game.dll..");
                h = LoadLibraryA("game.dll");
                main_loop = cast(dll_tick_t) GetProcAddress(h, "dll_tick");

                if (!h)
                {
                    LERRO("unnable to load game.dll");
                }
                else if (!main_loop)
                {
                    LERRO("game.dll doesn't have dll_tick exported");
                    unload_dll();
                }
                else
                {
                    LINFO("successfully reloaded game.dll");
                    dll_ok = true;
                }
            }
        }

        if (forceUnload)
        {
            LINFO("game.dll unloaded by force");
            forceUnload = false;
            unload_dll();
        }
    }
}