Subversion Repositories Games.Chess Giants

// main.cpp

#define DEFINE_GLOBALS

#include "common.h"

// prototypes of locally used functions

static void MainLoop_FindCurrentViewer (void);

static void MainLoop_EvaluateGameState (void);

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, char *lpCmdLine, int nCmdShow)

{

   // the entry point for any Windows program

   WNDCLASSEX wc;

   MENUINFO menu_info;

   MSG msg;

   HBITMAP hSplashBmp;

   BITMAP splash_bmp;

   HDC hdc;

   RECT rect;

   PAINTSTRUCT ps;

   HBITMAP hbmTmp;

   HDC hdcMem;

   INPUT mousemove_input;

   float previous_time;

   float screensaverwatchdog_feedtime;

   int frame_count;

   int array_index;

   char *endptr;

   wchar_t app_pathname[MAX_PATH];

   wchar_t font_pathname[MAX_PATH];

   wchar_t temp_string[100];

   // save application instance

   hAppInstance = hInstance;

   // find module and path names, and *IMPORTANT*, set the current working directory there

   GetModuleFileName (NULL, app_pathname, WCHAR_SIZEOF (app_pathname));

   GetDirectoryPath (app_pathname, app_path);

   SetCurrentDirectoryW (app_path);

   // initialize stuff

   is_registered = false;

   terminate_everything = false;

   hMainWnd = NULL;

   hChatterChannelsWnd = NULL;

   hGamesWnd = NULL;

   hMOTDWnd = NULL;

   hOpponentsWnd = NULL;

   hSoughtWnd = NULL;

   is_paused = false; // clear pause status

#ifdef NDEBUG

   want_framerate = false; // release mode, don't display framerate

#else

   want_framerate = true; // display framerate in debug mode

#endif // NDEBUG

   is_dialogbox_about_validated = false;

   is_dialogbox_challenge_validated = false;

   is_dialogbox_changeappearance_validated = false;

   is_dialogbox_comment_validated = false;

   is_dialogbox_endgame_validated = false;

   is_dialogbox_gotomove_validated = false;

   is_dialogbox_renamesides_validated = false;

   is_dialogbox_load_validated = false;

   is_dialogbox_message_validated = false;

   is_dialogbox_newgame_validated = false;

   is_dialogbox_options_validated = false;

   is_dialogbox_pawnpromotion_validated = false;

   is_dialogbox_playercard_validated = false;

   is_dialogbox_playerinfoname_validated = false;

   is_dialogbox_quit_validated = false;

   is_dialogbox_resign_validated = false;

   is_dialogbox_save_validated = false;

   is_dialogbox_saveposition_validated = false;

   is_dialogbox_sendchallenge_validated = false;

   is_dialogbox_sendseek_validated = false;

   is_dialogbox_takeback_validated = false;

   is_window_chat_validated = false;

   is_window_chatterchannels_validated = false;

   is_window_games_validated = false;

   is_window_motd_validated = false;

   is_window_opponents_validated = false;

   is_window_sought_validated = false;

   save_pathname[0] = 0;

   srand ((unsigned int) time (NULL)); // initialize PRNG

   animation_endtime = 0.0f;

   command_ignoretime = 0.0f;

   highlight_endtime = 0.0f;

   previous_time = 0.0f;

   frame_count = 0;

   // load the texts and ensure we have at least one display language

   LocalizedTexts_Init ();

   if (language_count < 1)

   {

      MessageBox (NULL, L"Chess Giants was unable to load its data files.\nThe game cannot start.\n\nPlease reinstall this program to fix the problem.", L"Chess Giants", MB_ICONERROR | MB_OK);

      return (-1); // bomb out on error

   }

   // read configuration data

   Config_Load ();

   // see if the program is registered

   is_registered = IsRegistrationCorrect (options.registration.user_email, options.registration.activation_code);

   // uncomment the two lines below to test the registration code

   //DialogBox_Registration ();

   //return (0);

   // register the window class, create the window and show it

   memset (&wc, 0, sizeof (wc));

   wc.cbSize = sizeof (wc);

   wc.style = CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS; // double-clicks support

   wc.lpfnWndProc = WindowProc_Main;

   wc.hInstance = hAppInstance;

   wc.hIcon = LoadIcon (hAppInstance, (wchar_t *) ICON_MAIN);

   wc.hCursor = LoadCursor (NULL, IDC_ARROW);

   wc.lpszClassName = PROGRAM_NAME L" WndClass";

   RegisterClassEx (&wc);

   swprintf_s (temp_string, WCHAR_SIZEOF (temp_string), PROGRAM_NAME L"%s", (is_registered ? L"" : LOCALIZE (L"EvaluationMode"))); // build window title

   if (options.want_fullscreen)

      hMainWnd = CreateWindowEx (0, wc.lpszClassName, temp_string, WS_POPUPWINDOW, // temp_string holds window title

                                 0, 0, GetSystemMetrics (SM_CXSCREEN), GetSystemMetrics (SM_CYSCREEN), NULL, NULL, hAppInstance, NULL);

   else

   {

      // in windowed mode, ensure window width and height aren't greater than screen size nor lower than a safe minimum

      if (options.window_width > GetSystemMetrics (SM_CXMAXTRACK))

         options.window_width = GetSystemMetrics (SM_CXMAXTRACK); // check this first in case screen size is reported incorrect

      if (options.window_height > GetSystemMetrics (SM_CYMAXTRACK))

         options.window_height = GetSystemMetrics (SM_CYMAXTRACK);

      if (options.window_width < 640)

         options.window_width = 640; // check this secondly in case screen size is reported incorrect

      if (options.window_height < 480)

         options.window_height = 480;

      hMainWnd = CreateWindowEx (0, wc.lpszClassName, temp_string, WS_OVERLAPPEDWINDOW, // temp_string holds window title

                                 GetSystemMetrics (SM_CXSCREEN) / 2 - options.window_width / 2,

                                 GetSystemMetrics (SM_CYSCREEN) / 2 - options.window_height / 2,

                                 options.window_width, options.window_height, NULL, NULL, hAppInstance, NULL);

   }

   ShowWindow (hMainWnd, (options.want_maximized ? SW_SHOWMAXIMIZED : nCmdShow)); // show it maximized if it was closed so

   // create the main menu line, and its accelerators

   hMainMenu = NULL;

   hMainAccelerators = NULL;

   CreateOrUpdateApplicationMenu ();

   // display the splash screen (uglily first, using GDI functions)

   memset ((void *) &splash_bmp, 0, sizeof (splash_bmp));

   hSplashBmp = W32LoadImage (L"%s/data/splash.bmp", app_path); // load the splash bitmap

   GetObject (hSplashBmp, sizeof (splash_bmp), (void *) &splash_bmp); // get a structure containing its size (among others)

   hdcMem = CreateCompatibleDC (NULL); // create a device context compatible with the screen

   hbmTmp = SelectBitmap (hdcMem, hSplashBmp); // select our bitmap to use in it

   hdc = BeginPaint (hMainWnd, &ps); // begin painting on the main window

   GetClientRect (hMainWnd, &rect);

   StretchBlt (hdc, 0, 0, rect.right, rect.bottom, hdcMem, 0, 0, splash_bmp.bmWidth, splash_bmp.bmHeight, SRCCOPY); // bit blit the bitmap into it

   EndPaint (hMainWnd, &ps); // end painting on the main window

   SelectObject (hdcMem, hbmTmp); // restore the previous selection

   DeleteDC (hdcMem); // and delete the handles to the device context

   DeleteObject (hSplashBmp); // and to the bitmap that we used

   // make the menu modeless

   memset (&menu_info, 0, sizeof (menu_info)); // prepare menu info structure

   menu_info.cbSize = sizeof (MENUINFO);

   menu_info.fMask = MIM_STYLE;

   GetMenuInfo (GetMenu (hMainWnd), &menu_info); // get current style

   menu_info.dwStyle |= MNS_MODELESS; // add the "modeless" flag

   SetMenuInfo (GetMenu (hMainWnd), &menu_info); // and send it back

   // load status icons, bitmaps and texts

   handlestatus[HANDLESTATUS_AVAILABLE].icon = W32LoadIcon (L"%s/data/icons/available.ico", app_path);

   handlestatus[HANDLESTATUS_AVAILABLE].bitmap = W32LoadImage (L"%s/data/status/available.bmp", app_path);

   handlestatus[HANDLESTATUS_AVAILABLE].text = LOCALIZE (L"Opponents_StatusAvailable");

   handlestatus[HANDLESTATUS_INGAME].icon = W32LoadIcon (L"%s/data/icons/ingame.ico", app_path);

   handlestatus[HANDLESTATUS_INGAME].bitmap = W32LoadImage (L"%s/data/status/ingame.bmp", app_path);

   handlestatus[HANDLESTATUS_INGAME].text = LOCALIZE (L"Opponents_StatusInGame");

   handlestatus[HANDLESTATUS_INSIMULATION].icon = W32LoadIcon (L"%s/data/icons/insimulation.ico", app_path);

   handlestatus[HANDLESTATUS_INSIMULATION].bitmap = W32LoadImage (L"%s/data/status/insimulation.bmp", app_path);

   handlestatus[HANDLESTATUS_INSIMULATION].text = LOCALIZE (L"Opponents_StatusInSimulation");

   handlestatus[HANDLESTATUS_INTOURNAMENT].icon = W32LoadIcon (L"%s/data/icons/intournament.ico", app_path);

   handlestatus[HANDLESTATUS_INTOURNAMENT].bitmap = W32LoadImage (L"%s/data/status/intournament.bmp", app_path);

   handlestatus[HANDLESTATUS_INTOURNAMENT].text = LOCALIZE (L"Opponents_StatusInTournament");

   handlestatus[HANDLESTATUS_EXAMININGAGAME].icon = W32LoadIcon (L"%s/data/icons/examiningagame.ico", app_path);

   handlestatus[HANDLESTATUS_EXAMININGAGAME].bitmap = W32LoadImage (L"%s/data/status/examiningagame.bmp", app_path);

   handlestatus[HANDLESTATUS_EXAMININGAGAME].text = LOCALIZE (L"Opponents_StatusExaminingAGame");

   handlestatus[HANDLESTATUS_NOTOPENFORAMATCH].icon = W32LoadIcon (L"%s/data/icons/notopenforamatch.ico", app_path);

   handlestatus[HANDLESTATUS_NOTOPENFORAMATCH].bitmap = W32LoadImage (L"%s/data/status/notopenforamatch.bmp", app_path);

   handlestatus[HANDLESTATUS_NOTOPENFORAMATCH].text = LOCALIZE (L"Opponents_StatusNotOpenForAMatch");

   handlestatus[HANDLESTATUS_INACTIVEORBUSY].icon = W32LoadIcon (L"%s/data/icons/inactiveorbusy.ico", app_path);

   handlestatus[HANDLESTATUS_INACTIVEORBUSY].bitmap = W32LoadImage (L"%s/data/status/inactiveorbusy.bmp", app_path);

   handlestatus[HANDLESTATUS_INACTIVEORBUSY].text = LOCALIZE (L"Opponents_StatusInactiveOrBusy");

   handlestatus[HANDLESTATUS_OFFLINE].icon = W32LoadIcon (L"%s/data/icons/offline.ico", app_path);

   handlestatus[HANDLESTATUS_OFFLINE].bitmap = W32LoadImage (L"%s/data/status/offline.bmp", app_path);

   handlestatus[HANDLESTATUS_OFFLINE].text = LOCALIZE (L"Opponents_StatusOffline");

   // load the system fonts

   hFontChat = CreateFont (17, 0, 0, 0, FW_DONTCARE, false, false, false, ANSI_CHARSET, OUT_DEFAULT_PRECIS,

                           CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH | FF_SWISS, L"Comic Sans MS");

   // before any rendering is done, it's a good idea to know what time it is

   current_time = ProcessTime ();

   stoppage_time = 0;

   screensaverwatchdog_feedtime = current_time + 50.0f; // feed screensaver watchdog every 50 seconds

   // initialize audio and renderer, and display a cleaner version of the splash screen this time :)

   if (!Audio_Init () || !Render_Init (L"%s/data/splash.bmp", app_path))

      return (-1); // bomb out on error

   // load sprites

   larrow_spriteindex = Render_LoadSprite (L"%s/data/sprites/arrow-left.png", app_path);

   rarrow_spriteindex = Render_LoadSprite (L"%s/data/sprites/arrow-right.png", app_path);

   newgamebutton_spriteindex = Render_LoadSprite (L"%s/data/sprites/newgame.png", app_path);

   opengamebutton_spriteindex = Render_LoadSprite (L"%s/data/sprites/opengame.png", app_path);

   chatbutton_spriteindex = Render_LoadSprite (L"%s/data/sprites/chat.png", app_path);

   gamesbutton_spriteindex = Render_LoadSprite (L"%s/data/sprites/games.png", app_path);

   peoplebutton_spriteindex = Render_LoadSprite (L"%s/data/sprites/people.png", app_path);

   sepia_spriteindex = Render_LoadSprite (L"%s/data/sprites/sepia.png", app_path);

   for (array_index = 0; array_index < 12; array_index++)

      spinner_spriteindex[array_index] = Render_LoadSprite (L"%s/data/sprites/spinner-%d.png", app_path, array_index * 30); // spinning wheel

   // add our custom fonts to the list of available fonts for the duration of the process

   swprintf_s (font_pathname, WCHAR_SIZEOF (font_pathname), L"%s/data/fonts/papyrus.ttf", app_path);

   AddFontResourceEx (font_pathname, FR_PRIVATE, 0);

   // load rendered fonts

   arrow_fontindex = Render_LoadFont (L"Papyrus", 24, false, false);

   chat_fontindex = Render_LoadFont (L"Papyrus", 32, false, false);

   players_fontindex = Render_LoadFont (L"Papyrus", 40, false, true);

   centermsg_fontindex = Render_LoadFont (L"Papyrus", 54, false, true);

   // load themes, initialize a new human vs. human game and setup the scene

   if (!Themes_Init ())

      return (-1); // bomb out on error

   Board_Init (&the_board, PLAYER_HUMAN, PLAYER_HUMAN, FENSTARTUP_STANDARDCHESS);

   Scene_Init (&the_scene, &the_board);

   // has a filename been specifed on the command-line AND that file exists ?

   if ((lpCmdLine != NULL) && (lpCmdLine[0] != 0))

   {

      while (*lpCmdLine == '"')

         lpCmdLine++; // skip leading quotes

      if ((endptr = strchr (lpCmdLine, '"')) != NULL)

         *endptr = 0; // break the string at the first ending quote

      // is it a file that exists ? (don't use stat() which is broken on WinXP)

      if (_access (lpCmdLine, 0) == 0)

      {

         ConvertToWideChar (load_pathname, WCHAR_SIZEOF (load_pathname), lpCmdLine); // save pathname string

         is_dialogbox_load_validated = true; // and act as if the user just validated a load dialog box

      }

#ifndef NDEBUG

      // else is it a registration info ? if so, parse it

      else if ((strncmp (lpCmdLine, "/r=", 3) == 0) && ((endptr = strchr (&lpCmdLine[3], ',')) != NULL))

      {

         *endptr = 0; // break the string at the separator between user email and activation code

         ConvertToWideChar (temp_string, WCHAR_SIZEOF (temp_string), &lpCmdLine[3]); // read user email

         is_registered = IsRegistrationCorrect (temp_string, atoi (endptr + 1)); // and see whether we're registered or not

      }

#endif // !NDEBUG

   }

   // TODO: this + offline statistics

   // enter the main loop

   while (!terminate_everything)

   {

      // see what time it is

      current_time = ProcessTime ();

      if (is_paused)

         stoppage_time += (current_time - previous_time); // if we're paused, increase stoppage time

      // is it time to feed the screensaver watchdog ? (to prevent it from starting)

      if (screensaverwatchdog_feedtime < current_time)

      {

         mousemove_input.type = INPUT_MOUSE;

         memset (&mousemove_input.mi, 0, sizeof (mousemove_input.mi)); // blank out struct = no move at all :)

         mousemove_input.mi.dwFlags = MOUSEEVENTF_MOVE;

         SendInput (1, &mousemove_input, sizeof (mousemove_input)); // send a fake mouse move input event

         screensaverwatchdog_feedtime = current_time + 50.0f; // feed screensaver watchdog again in 50 seconds

      }

      // are we in demo mode and is it time to quit ?

      if (!is_registered && (current_time > DEMO_TIMEOUT))

         DestroyWindow (hMainWnd); // if so, send a quit message in order to break the loop

      // are we in the middle of an animation or just after it ?

      if (current_time < animation_endtime + 0.5f)

         the_scene.update = true; // always update during animations

      else

         the_scene.update |= Board_Think (&the_board); // make the board (i.e, both players) think

      MainLoop_FindCurrentViewer ();  // determine current viewer

      // see if we have a message waiting for any window in the current thread and dispatch it

      while (PeekMessage (&msg, NULL, 0, 0, PM_REMOVE))

      {

         // check for accelerator keystrokes from the main window

         if ((msg.hwnd != hMainWnd) || !TranslateAccelerator (hMainWnd, hMainAccelerators, &msg))

         {

            TranslateMessage (&msg); // translate and dispatch all other messages

            DispatchMessage (&msg);

         }

      }

      // handle dialog box and window return codes

      if (is_dialogbox_about_validated) DialogBox_About_Validated ();

      if (is_dialogbox_challenge_validated) DialogBox_Challenge_Validated ();

      if (is_dialogbox_changeappearance_validated) DialogBox_ChangeAppearance_Validated ();

      if (is_dialogbox_comment_validated) DialogBox_Comment_Validated ();

      if (is_dialogbox_endgame_validated) DialogBox_EndGame_Validated ();

      if (is_dialogbox_gotomove_validated) DialogBox_GoToMove_Validated ();

      if (is_dialogbox_renamesides_validated) DialogBox_RenameSides_Validated ();

      if (is_dialogbox_load_validated) DialogBox_Load_Validated ();

      if (is_dialogbox_message_validated) DialogBox_Message_Validated ();

      if (is_dialogbox_newgame_validated) DialogBox_NewGame_Validated ();

      if (is_dialogbox_options_validated) DialogBox_Options_Validated ();

      if (is_dialogbox_pawnpromotion_validated) DialogBox_PawnPromotion_Validated ();

      if (is_dialogbox_playercard_validated) DialogBox_PlayerCard_Validated ();

      if (is_dialogbox_playerinfoname_validated) DialogBox_PlayerInfoName_Validated ();

      if (is_dialogbox_quit_validated) DialogBox_Quit_Validated ();

      if (is_dialogbox_resign_validated) DialogBox_Resign_Validated ();

      if (is_dialogbox_save_validated) DialogBox_Save_Validated ();

      if (is_dialogbox_saveposition_validated) DialogBox_SavePosition_Validated ();

      if (is_dialogbox_sendchallenge_validated) DialogBox_SendChallenge_Validated ();

      if (is_dialogbox_sendseek_validated) DialogBox_SendSeek_Validated ();

      if (is_dialogbox_takeback_validated) DialogBox_Takeback_Validated ();

      if (is_window_chat_validated) Window_Chat_Validated ();

      if (is_window_chatterchannels_validated) Window_ChatterChannels_Validated ();

      if (is_window_games_validated) Window_Games_Validated ();

      if (is_window_motd_validated) Window_MOTD_Validated ();

      if (is_window_opponents_validated) Window_Opponents_Validated ();

      if (is_window_sought_validated) Window_Sought_Validated ();

      MainLoop_EvaluateGameState (); // evaluate game state

      // is the table rotating ?

      if (Player_RotateTable (&the_board.players[current_viewer], current_time - previous_time))

         the_scene.update = true; // if so, update the scene

      // are we highlighting something ?

      if (highlight_endtime > current_time)

         the_scene.update = true; // if so, update the scene

      // else if we WERE just highlighting something, clear the hovered positions

      else if (highlight_endtime + 0.1f > current_time)

      {

         the_board.hovered_position[0] = -1;

         the_board.hovered_position[1] = -1;

         the_scene.update = true; // and update the scene

      }

      // if we want the game clock, update scene every second

      if (options.want_clock && ((int) current_time != (int) previous_time))

         the_scene.update = true;

      // if there's something in the central text buffer, update scene too

      if (the_scene.gui.central_text.is_displayed)

         the_scene.update = true;

      // if we have a spinning wheel, update scene too

      if (the_scene.gui.want_spinwheel)

         the_scene.update = true;

      // is our theme not loaded yet ?

      if (!theme->is_loaded)

         Theme_LoadABitMore (theme); // load a bit more of it

      // else do we NOT need to update the scene ?

      else if (!(the_scene.update || want_framerate))

      {

         // cycle through all themes and see if one of them needs to be loaded

         for (array_index = 0; array_index < theme_count; array_index++)

            if (!themes[array_index].is_loaded)

            {

               Theme_LoadABitMore (&themes[array_index]); // load a bit more of this theme

               break; // and stop looping (see you next pass)

            }

      }

      // either we need to update the scene, or we want to do it continuously

      else

      {

         Scene_Update (&the_scene, &the_board); // evaluate which parts need to be placed

         Render_RenderFrame (&the_scene); // render a game frame

         the_scene.update = false; // scene no longer needs to be updated now

      }

      Audio_Think (); // ensure audio is playing

      previous_time = current_time; // save previous time

      if (frame_count == 100)

      {

         frame_count = 0; // reset frame count every 100 frames

         Sleep (1); // once every 100 frames, wait a millisecond

      }

      else

         Sleep (0); // else just allow context switching

      frame_count++; // increase the frame count

   }

   /////////////////////////////////////////////////////////////////////////

   // at this point, we exited the main loop and we are returning to Windows

   // release scene, game, themes and shutdown renderer and audio

   Scene_Shutdown (&the_scene);

   Board_Shutdown (&the_board);

   Themes_Shutdown ();

   Render_Shutdown ();

   Audio_Shutdown ();

   // delete the font resources

   DeleteObject (hFontChat);

   // delete the bitmap and icon ressources

   for (array_index = 1; array_index < sizeof (handlestatus) / sizeof (handlestatus[0]); array_index++)

   {

      DeleteObject (handlestatus[array_index].bitmap);

      DestroyIcon (handlestatus[array_index].icon);

   }

   // unregister window class

   UnregisterClass (wc.lpszClassName, hAppInstance);

   // destroy the accelerators table

   if (hMainAccelerators)

      DestroyAcceleratorTable (hMainAccelerators);

   hMainAccelerators = NULL;

   // destroy the application menu object

   if (IsMenu (hMainMenu))

      DestroyMenu (hMainMenu);

   hMainMenu = NULL;

   // are we not registered yet ?

   if (!is_registered)

      DialogBox_Registration ();

   // save configuration data

   Config_Save ();

   // unload localized texts

   LocalizedTexts_Shutdown ();

   return (0); // and return to Windows.

}

static void MainLoop_FindCurrentViewer (void)

{

   // helper function that tells who is the current viewer

   if ((the_board.players[COLOR_WHITE].type == PLAYER_HUMAN) && (the_board.players[COLOR_BLACK].type == PLAYER_HUMAN))

      current_viewer = Board_ColorToMove (&the_board); // if both players are human, track them both

   else if (the_board.players[COLOR_WHITE].type == PLAYER_HUMAN)

      current_viewer = COLOR_WHITE; // else if only the white is human, track the white

   else if (the_board.players[COLOR_BLACK].type == PLAYER_HUMAN)

      current_viewer = COLOR_BLACK; // else if it's the black, track the black

   else

      current_viewer = COLOR_WHITE; // else no human in game, track just the white

   return; // finished, current viewer is known

}

static void MainLoop_EvaluateGameState (void)

{

   // function to evaluate the game state in the main loop when a part has just moved

   static wchar_t window_title[256];

   player_t *current_player;

   player_t *opposite_player;

   player_t *network_player;

   boardmove_t *last_move;

   int enabled_value;

   int move_index;

   // get current and opposite players, and see if we're online

   current_player = Player_GetCurrent ();

   opposite_player = Player_GetOpposite ();

   network_player = Player_FindByType (PLAYER_INTERNET);

   // if the view distance or pitch is lower than the minimum, enable the "new game" and "open game" buttons

   if ((network_player == NULL) && (current_distance == CLOSEUP_VIEW_DISTANCE) && (current_pitch == CLOSEUP_VIEW_PITCH))

   {

      GUIBUTTON_ENABLE (the_scene.gui.newgamebutton);

      GUIBUTTON_ENABLE (the_scene.gui.opengamebutton);

   }

   else

   {

      GUIBUTTON_DISABLE (the_scene.gui.newgamebutton);

      GUIBUTTON_DISABLE (the_scene.gui.opengamebutton);

   }

   if (!the_board.reevaluate)

      return; // if the board doesn't need to be reevaluated, don't do anything

   // has the game started ?

   if (the_board.move_count > 1)

   {

      // game has started, enable the "save" and "save as" menu options

      EnableMenuItem (GetMenu (hMainWnd), MENUID_GAME_SAVE, MF_ENABLED);

      EnableMenuItem (GetMenu (hMainWnd), MENUID_GAME_SAVEAS, MF_ENABLED);

      EnableMenuItem (GetMenu (hMainWnd), MENUID_GAME_SAVEPOSITIONAS, MF_ENABLED);

      // enable the "go to move" menu option

      EnableMenuItem (GetMenu (hMainWnd), MENUID_CHESSBOARD_GOTOMOVE, MF_ENABLED);

      // are we watching the last move ?

      if (the_board.viewed_move == the_board.move_count - 1)

      {

         // get a quick acccess to the last move

         last_move = &the_board.moves[the_board.move_count - 1];

         // if the current player is a human AND its opponent is a computer, allow him to ask us for a hint

         if ((current_player->type == PLAYER_HUMAN) && (opposite_player->type == PLAYER_COMPUTER))

            EnableMenuItem (GetMenu (hMainWnd), MENUID_CHESSBOARD_SUGGESTMOVE, MF_ENABLED);

         else

            EnableMenuItem (GetMenu (hMainWnd), MENUID_CHESSBOARD_SUGGESTMOVE, MF_GRAYED);

         // (if the current player is a human

         //  AND (its opponent is another human AND there's at least one move played)

         //       OR (its opponent is a computer AND there are at least two moves played)

         //       OR (its opponent is a remote player AND we're in game AND there are at least two moves played))

         // OR the current player is a remote player AND we're in game AND there are at least two moves played), allow him to cancel move

         if (((current_player->type == PLAYER_HUMAN)

              && ((opposite_player->type == PLAYER_HUMAN)

                  || ((opposite_player->type == PLAYER_COMPUTER) && (the_board.move_count > 2))

                  || ((opposite_player->type == PLAYER_INTERNET) && (opposite_player->is_in_game) && (the_board.move_count > 2))))

             || ((current_player->type == PLAYER_INTERNET) && (current_player->is_in_game) && (the_board.move_count > 2)))

            EnableMenuItem (GetMenu (hMainWnd), MENUID_CHESSBOARD_CANCELLASTMOVE, MF_ENABLED);

         else

            EnableMenuItem (GetMenu (hMainWnd), MENUID_CHESSBOARD_CANCELLASTMOVE, MF_GRAYED);

         // is the current player in check ? (to play the right sound)

         // read as: was the last move an opponent's move AND did it put us to check ?

         if (last_move->is_check)

         {

            // is it a checkmate ? (checkmate == check + stalemate)

            if (last_move->is_stalemate)

            {

               // display the game over dialog box

               the_board.game_state = (Board_ColorToMove (&the_board) == COLOR_WHITE ? STATE_BLACKWIN_CHECKMATE : STATE_WHITEWIN_CHECKMATE);

               DialogBox_EndGame ();

            }

         }

         else

         {

            // is it a stalemate ?

            if (last_move->is_stalemate)

            {

               // display the game over dialog box

               the_board.game_state = STATE_DRAW_STALEMATE;

               DialogBox_EndGame ();

            }

         }

         // have there 50 moves been played each side (i.e, 100 plies) AND is the current player human ?

         if ((the_board.move_count > 100) && (current_player->type == PLAYER_HUMAN))

         {

            // go backwards and see when is the latest move that took an opponent's piece OR the latest pawn move

            for (move_index = the_board.move_count - 1; move_index >= 0; move_index--)

               if (the_board.moves[move_index].has_captured || (the_board.moves[move_index].part == PART_PAWN))

                  break; // stop as soon as we find one

            // can the fifty moves draw rule be claimed AND does the current player claims it ?

            if (move_index + 1 + 100 < the_board.move_count)

            {

               // yes. Propose it to the side that's on move

// TODO: non-modal MessageBox (copy dialog_newgame.cpp and use return values)

            }

         }

         GUIBUTTON_ENABLE (the_scene.gui.larrow); // enable "back" arrow if it isn't displayed yet

         GUIBUTTON_DISABLE (the_scene.gui.rarrow); // disable "forward" arrow if it's already displayed

         if (the_board.game_state == STATE_PLAYING)

            Scene_SetText (&the_scene.gui.arrow_text, 3.3f, 5.0f, -1, ALIGN_CENTER, ALIGN_TOP, ALIGN_CENTER, arrow_fontindex,

                           RGBACOLOR_SETALPHA (options.clock_color, 0x7f), 999999.0f, false, LOCALIZE (is_paused ? L"Paused" : L"Current"));

         else if ((the_board.game_state == STATE_BLACKWIN_CHECKMATE) || (the_board.game_state == STATE_WHITEWIN_CHECKMATE))

            Scene_SetText (&the_scene.gui.arrow_text, 3.3f, 5.0f, -1, ALIGN_CENTER, ALIGN_TOP, ALIGN_CENTER, arrow_fontindex,

                           RGBACOLOR_SETALPHA (options.clock_color, 0x7f), 999999.0f, false, LOCALIZE (L"EndGame_CheckMate"));

         else if ((the_board.game_state == STATE_WHITEWIN_RESIGNORFORFEIT) || (the_board.game_state == STATE_BLACKWIN_RESIGNORFORFEIT))

            Scene_SetText (&the_scene.gui.arrow_text, 3.3f, 5.0f, -1, ALIGN_CENTER, ALIGN_TOP, ALIGN_CENTER, arrow_fontindex,

                           RGBACOLOR_SETALPHA (options.clock_color, 0x7f), 999999.0f, false, LOCALIZE (L"EndGame_Resign"));

         else if (the_board.game_state == STATE_DRAW_STALEMATE)

            Scene_SetText (&the_scene.gui.arrow_text, 3.3f, 5.0f, -1, ALIGN_CENTER, ALIGN_TOP, ALIGN_CENTER, arrow_fontindex,

                           RGBACOLOR_SETALPHA (options.clock_color, 0x7f), 999999.0f, false, LOCALIZE (L"EndGame_StaleMate"));

         else if (the_board.game_state == STATE_DRAW_AGREEMENT)

            Scene_SetText (&the_scene.gui.arrow_text, 3.3f, 5.0f, -1, ALIGN_CENTER, ALIGN_TOP, ALIGN_CENTER, arrow_fontindex,

                           RGBACOLOR_SETALPHA (options.clock_color, 0x7f), 999999.0f, false, LOCALIZE (L"EndGame_Agreement"));

         else if (the_board.game_state == STATE_DRAW_OTHER)

            Scene_SetText (&the_scene.gui.arrow_text, 3.3f, 5.0f, -1, ALIGN_CENTER, ALIGN_TOP, ALIGN_CENTER, arrow_fontindex,

                           RGBACOLOR_SETALPHA (options.clock_color, 0x7f), 999999.0f, false, LOCALIZE (L"EndGame_DrawOther"));

         // enable the "comment on this move" menu option

         EnableMenuItem (GetMenu (hMainWnd), MENUID_CHESSBOARD_COMMENTMOVE, MF_ENABLED);

      }

      // else are we watching another move, but not the beginning of the game ?

      else if (the_board.viewed_move > 0)

      {

         GUIBUTTON_ENABLE (the_scene.gui.larrow); // enable "back" arrow if it isn't displayed yet

         GUIBUTTON_ENABLE (the_scene.gui.rarrow); // enable "forward" arrow if it isn't displayed yet

         Scene_SetText (&the_scene.gui.arrow_text, 3.3f, 5.0f, -1, ALIGN_CENTER, ALIGN_TOP, ALIGN_CENTER, arrow_fontindex,

                        RGBACOLOR_SETALPHA (options.clock_color, 0x7f), 999999.0f, false,

                        L"%s %d\n%s", LOCALIZE (L"Move"), (the_board.viewed_move + 1) / 2, (the_board.viewed_move % 2 ? LOCALIZE (L"Games_White"): LOCALIZE (L"Games_Black")));

         // enable the "save position as" and "comment on this move" menu options

         EnableMenuItem (GetMenu (hMainWnd), MENUID_GAME_SAVEPOSITIONAS, MF_ENABLED);

         EnableMenuItem (GetMenu (hMainWnd), MENUID_CHESSBOARD_COMMENTMOVE, MF_ENABLED);

      }

      // else we must be watching the beginning of the game (no move yet)

      else

      {

         GUIBUTTON_DISABLE (the_scene.gui.larrow); // disable "back" arrow if it's already displayed

         GUIBUTTON_ENABLE (the_scene.gui.rarrow); // enable "forward" arrow if it isn't displayed yet

         Scene_SetText (&the_scene.gui.arrow_text, 3.3f, 5.0f, -1, ALIGN_CENTER, ALIGN_TOP, ALIGN_CENTER, arrow_fontindex,

                        RGBACOLOR_SETALPHA (options.clock_color, 0x7f), 999999.0f, false, LOCALIZE (L"Beginning"));

         // disable the "save position as" and "comment on this move" menu options

         EnableMenuItem (GetMenu (hMainWnd), MENUID_GAME_SAVEPOSITIONAS, MF_GRAYED);

         EnableMenuItem (GetMenu (hMainWnd), MENUID_CHESSBOARD_COMMENTMOVE, MF_GRAYED);

      }

   }

   else

   {

      // game has not started, disable the "save", "save as" and "save position as" menu options

      EnableMenuItem (GetMenu (hMainWnd), MENUID_GAME_SAVE, MF_GRAYED);

      EnableMenuItem (GetMenu (hMainWnd), MENUID_GAME_SAVEAS, MF_GRAYED);

      EnableMenuItem (GetMenu (hMainWnd), MENUID_GAME_SAVEPOSITIONAS, MF_GRAYED);

      // if the current player is a human AND its opponent is a computer, allow him to ask us for a hint

      if ((current_player->type == PLAYER_HUMAN) && (opposite_player->type == PLAYER_COMPUTER))

         EnableMenuItem (GetMenu (hMainWnd), MENUID_CHESSBOARD_SUGGESTMOVE, MF_ENABLED);

      else

         EnableMenuItem (GetMenu (hMainWnd), MENUID_CHESSBOARD_SUGGESTMOVE, MF_GRAYED);

      // disable the "cancel last move", "comment move" and "go to move" menu options

      EnableMenuItem (GetMenu (hMainWnd), MENUID_CHESSBOARD_CANCELLASTMOVE, MF_GRAYED);

      EnableMenuItem (GetMenu (hMainWnd), MENUID_CHESSBOARD_COMMENTMOVE, MF_GRAYED);

      EnableMenuItem (GetMenu (hMainWnd), MENUID_CHESSBOARD_GOTOMOVE, MF_GRAYED);

      is_paused = false; // clear pause status (we can only pause a game when it's been started)

      // and disable the two arrows and the arrow text

      GUIBUTTON_DISABLE (the_scene.gui.larrow);

      GUIBUTTON_DISABLE (the_scene.gui.rarrow);

      the_scene.gui.arrow_text.is_displayed = false;

   }

   // no matter whether the game started or not, if the current player is a human AND its opponent is a computer, allow him to swap sides

   if ((current_player->type == PLAYER_HUMAN) && (opposite_player->type == PLAYER_COMPUTER))

      EnableMenuItem (GetMenu (hMainWnd), MENUID_CHESSBOARD_SWAPSIDES, MF_ENABLED);

   else

      EnableMenuItem (GetMenu (hMainWnd), MENUID_CHESSBOARD_SWAPSIDES, MF_GRAYED);

   // no matter whether the game started or not, enable players renaming only if we are NOT in internet mode

   EnableMenuItem (GetMenu (hMainWnd), MENUID_CHESSBOARD_RENAMESIDES, (network_player == NULL ? MF_ENABLED : MF_GRAYED));

   // update window title

   if ((the_board.players[COLOR_WHITE].name[0] != 0) && (the_board.players[COLOR_BLACK].name[0] != 0))

   {

      swprintf_s (window_title, WCHAR_SIZEOF (window_title), L"%s %s %s - " PROGRAM_NAME L"%s", the_board.players[COLOR_WHITE].name, LOCALIZE (L"Versus"), the_board.players[COLOR_BLACK].name, (is_registered ? L"" : LOCALIZE (L"EvaluationMode")));

      SetWindowText (hMainWnd, window_title); // update window title

   }

   else if (the_board.players[COLOR_WHITE].name[0] != 0)

   {

      swprintf_s (window_title, WCHAR_SIZEOF (window_title), L"%s - " PROGRAM_NAME L"%s", the_board.players[COLOR_WHITE].name, (is_registered ? L"" : LOCALIZE (L"EvaluationMode")));

      SetWindowText (hMainWnd, window_title); // update window title

   }

   // are we in internet mode AND are we logged in ?

   if ((network_player != NULL) && network_player->is_logged_in)

   {

      // are we currently playing a game ?

      if (network_player->is_in_game)

      {

         GUIBUTTON_ENABLE (the_scene.gui.chatbutton); // enable chat button if it's not enabled yet

         GUIBUTTON_DISABLE (the_scene.gui.gamesbutton); // disable games button if it was enabled

         GUIBUTTON_DISABLE (the_scene.gui.peoplebutton); // disable people button if it was enabled

         EnableMenuItem (GetMenu (hMainWnd), MENUID_GAME_RESIGN, MF_ENABLED); // allow resigning

      }

      else

      {

         GUIBUTTON_DISABLE (the_scene.gui.chatbutton); // disable chat button if it was enabled

         GUIBUTTON_ENABLE (the_scene.gui.gamesbutton); // enable games button if it's not enabled yet

         GUIBUTTON_ENABLE (the_scene.gui.peoplebutton); // enable people button if it's not enabled yet

         EnableMenuItem (GetMenu (hMainWnd), MENUID_GAME_RESIGN, MF_GRAYED); // disable ability to resign

      }

      EnableMenuItem (GetMenu (hMainWnd), MENUID_GAME_PAUSE, MF_DISABLED); // disallow pause

      EnableMenuItem (GetMenu (hMainWnd), MENUID_GAME_STATISTICS, MF_ENABLED); // enable stats

      enabled_value = MF_ENABLED; // remember to enable the internet-related menu items

   }

   // else it's a local or vs. computer game

   else

   {

      GUIBUTTON_DISABLE (the_scene.gui.chatbutton); // disable chat button if it was enabled

      GUIBUTTON_DISABLE (the_scene.gui.gamesbutton); // disable games button if it was enabled

      GUIBUTTON_DISABLE (the_scene.gui.peoplebutton); // disable people button if it was enabled

      EnableMenuItem (GetMenu (hMainWnd), MENUID_GAME_PAUSE, (the_board.move_count > 1 ? MF_ENABLED : MF_GRAYED)); // allow pause if the game has started