Subversion Repositories Games.Chess Giants

// player.cpp

#include "common.h"

void Player_Init (player_t *player, int color, int type)

{

   // helper function to initialize a player structure

   unsigned long buffer_size;

   // first reset the whole structure

   memset (player, 0, sizeof (player_t));

   // allocate space for send and receive buffers and reset them

   player->sendbuffer_locked = false;

   player->sendbuffer_size = 1048576;

   player->sendbuffer = (wchar_t *) SAFE_malloc (player->sendbuffer_size, sizeof (wchar_t), false);

   player->sendbuffer[0] = 0;

   player->recvbuffer_size = 1048576;

   player->ascii_recvbuffer = (char *) SAFE_malloc (player->recvbuffer_size, sizeof (char), false);

   player->ascii_recvbuffer[0] = 0;

   player->recvbuffer = (wchar_t *) SAFE_malloc (player->recvbuffer_size, sizeof (wchar_t), false);

   player->recvbuffer[0] = 0;

   // save player type and color

   player->type = type;

   player->color = color;

   // if internet or computer play, initialize the right interface

   if (player->type == PLAYER_INTERNET)

   {

      // if we want online gaming, initialize the network

      if (!PlayerNetwork_Init (player))

         player->type = PLAYER_HUMAN; // if it fails, fallback to human opponent

   }

   if (player->type == PLAYER_COMPUTER)

   {

      // if we want the chess engine, initialize it

      if (!PlayerEngine_Init (player))

         player->type = PLAYER_HUMAN; // if it fails, fallback to human opponent

   }

   if (player->type == PLAYER_HUMAN)

   {

      // player is human, assume his name to be his Windows session name (until told otherwise)

      buffer_size = WCHAR_SIZEOF (player->name);

      GetUserName (player->name, &buffer_size);

   }

   // reset its view

   Player_ResetView (player);

   return; // finished

}

void Player_Shutdown (player_t *player)

{

   // helper function to release a player structure

   // if the chess engine was started, shut it down

   if (player->type == PLAYER_COMPUTER)

      PlayerEngine_Shutdown (player);

   // else if we were online, shutdown the network

   else if (player->type == PLAYER_INTERNET)

      PlayerNetwork_Shutdown (player);

   // free the send and receive buffers

   SAFE_free ((void **) &player->recvbuffer);

   SAFE_free ((void **) &player->ascii_recvbuffer);

   SAFE_free ((void **) &player->sendbuffer);

   // and finally reset the whole structure

   memset (player, 0, sizeof (player_t));

   return; // finished

}

void Player_ResetView (player_t *player)

{

   // helper function to reset a player's current and custom view

   // reset current view

   player->view_pitch = 55.0f;

   player->view_yaw = (player->color == COLOR_BLACK ? 90.0f : -90.0f);

   player->view_distance = 70.0f;

   // reset custom view too

   player->custom_pitch = player->view_pitch;

   player->custom_yaw = player->view_yaw;

   player->custom_distance = player->view_distance;

   return; // finished

}

bool Player_RotateTable (player_t *player, float frame_time)

{

   // this function is called every frame to rotate the chess table. There is some kind of

   // filtering for the view. The function returns TRUE if the scene needs to be updated

   // (that is, the table turned significantly).

   float deviation_yaw;

   float deviation_pitch;

   float deviation_distance;

   float turnspeed_yaw;

   float turnspeed_pitch;

   float turnspeed_distance;

   // do we NOT want autorotation OR are we NOT playing yet OR are we still in animation ?

   if (!options.want_autorotateon1vs1 || (the_board.game_state < STATE_PLAYING) || (current_time < animation_endtime + 1.0f))

      return (false); // if so, don't rotate anything

   // compute what's left to turn yet

   deviation_yaw = WrapAngle (player->view_yaw - current_yaw);

   deviation_pitch = WrapAngle (player->view_pitch - current_pitch);

   deviation_distance = player->view_distance - current_distance;

   // compute the new turn speed

   turnspeed_yaw = ((float) options.rotate_speed * deviation_yaw) * min (frame_time, 0.01f);

   turnspeed_pitch = ((float) options.rotate_speed * deviation_pitch) * min (frame_time, 0.01f);

   turnspeed_distance = ((float) options.rotate_speed * deviation_distance) * min (frame_time, 0.01f);

   // move the aim cursor

   current_yaw = WrapAngle (current_yaw + turnspeed_yaw);

   current_pitch = WrapAngle (current_pitch + turnspeed_pitch);

   current_distance = current_distance + turnspeed_distance;

   // return whether the table moved significantly or not

   return ((abs (turnspeed_yaw) > 0.01f) || (abs (turnspeed_pitch) > 0.01f) || (abs (turnspeed_distance) > 0.1f));

}

bool Player_Think (player_t *player)

{

   // this function makes the players think (in case they are not human)

   player_t *current_player;

   player_t *opposite_player;

   bool do_update;

   do_update = false; // don't update scene until told otherwise

   // get current and opposite players

   current_player = Player_GetCurrent ();

   opposite_player = Player_GetOpposite ();

   // if we're in online gaming mode, listen to the network

   if (player->type == PLAYER_INTERNET)

      do_update |= PlayerNetwork_Think (player); // and see if we need to update the scene

   // else if we're running a chess engine, listen to it

   else if (player->type == PLAYER_COMPUTER)

      do_update |= PlayerEngine_Think (player); // and see if we need to update the scene

   // else player is human

   else

   {

      // is it NOT our turn AND does our opponent want to cancel a move ?

      if ((player != current_player) && current_player->wants_cancel)

      {

         current_player->wants_cancel = false; // don't ask twice (remember now before we switch players)

         // rewind game 1 move back

         the_board.moves = (boardmove_t *) SAFE_realloc (the_board.moves, the_board.move_count, max (1, the_board.move_count - 1), sizeof (boardmove_t), false);

         the_board.move_count = max (1, the_board.move_count - 1); // figure out how many moves we have now

         the_board.viewed_move = the_board.move_count - 1; // take us back to the last move

         do_update = true; // update the 3D scene

      }

   }

   return (do_update); // finished, return whether we update the scene or not

}

bool Player_SendBuffer_Add (player_t *player, int milliseconds_max, const wchar_t *fmt, ...)

{

   // helper function to append a data string to the send buffer. Returns FALSE in case buffer is inaccessible.

   va_list argptr;

   int length;

   int count;

   // as long as the buffer is locked...

   count = 0;

   while (player->sendbuffer_locked && (count < milliseconds_max))

   {

      Sleep (10); // wait 10 milliseconds

      count += 10; // remember we've waited 10 milliseconds more

   }

   // is send buffer STILL locked ?

   if (player->sendbuffer_locked)

      return (false); // buffer is inaccessible, return FALSE

   player->sendbuffer_locked = true; // lock the buffer

   length = wcslen (player->sendbuffer); // get current buffer length

   // concatenate all the arguments in one string at the end of the buffer

   va_start (argptr, fmt);

   vswprintf_s (&player->sendbuffer[length], player->sendbuffer_size - length, fmt, argptr);

   va_end (argptr);

   player->sendbuffer_locked = false; // unlock it

   return (true); // done

}

player_t *Player_FindByType (int player_type)

{

   // wrapper that returns a pointer to the first player representing the wanted type on a board

   // figure out which player is of the type we want and return it

   if (the_board.players[COLOR_WHITE].type == player_type)

      return (&the_board.players[COLOR_WHITE]); // it's the white player

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

      return (&the_board.players[COLOR_BLACK]); // it's the black player

   return (NULL); // can't find any player of the given type on this board

}

player_t *Player_GetCurrent (void)

{

   // helper function that returns the current player

   // return the current player

   return (&the_board.players[Board_ColorToMove (&the_board)]);

}

player_t *Player_GetOpposite (void)

{

   // helper function that returns the opposite player

   // return the opposite player

   return (&the_board.players[1 - Board_ColorToMove (&the_board)]);

}