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Game of Life: Gosper Glider Gun

Duthomhas (13200)
Some time ago someone posted a Game Of Life thread here... I can't find it now but I had never played with it before and figured why not have some fun?

Anyway, this is the toy I hacked up to play with it. I have not been able to test it in Linux (as my PC is still dead, and I'm using my son's ATM -- great story! I'm working on two dead motherboards and four bad HDs now... I suppose I'm not allowed to have my own system right now).

In any case, the toy:
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// Gosper Glider Gun

// Written by Michael Thomas Greer
// Released to the Public Domain.

// Compiling Instructions
//   Compile with C++11 mode.
//   Windows:
//     Make sure you are compiling a normal Windows console application.
//   Unix/Linux:
//     Be sure to link with -lcurses (If that doesn't work, try -lncurses or
//     -lterminfo. If those don't work, be sure to make sure you have the
//     terminfo library installed and read the man pages for how to link.)

//////////////////////////////////////////////////////////////////////////////
#ifdef _WIN32
//////////////////////////////////////////////////////////////////////////////

  #define NOMINMAX
  #include <windows.h>

  //--------------------------------------------------------------------------
  bool Initialize( int& w, int& h )
    {
    CONSOLE_SCREEN_BUFFER_INFO csbi;
    HANDLE hStdOut = GetStdHandle( STD_OUTPUT_HANDLE );
    if (!GetConsoleScreenBufferInfo( hStdOut, &csbi ))
      return false;

    w = csbi.srWindow.Right  - csbi.srWindow.Left + 1;
    h = csbi.srWindow.Bottom - csbi.srWindow.Top  + 1;

    return true;
    }

  //--------------------------------------------------------------------------
  void Finalize()
    { }

  //--------------------------------------------------------------------------
  void ClearScreen()
    {
    HANDLE                     hStdOut;
    CONSOLE_SCREEN_BUFFER_INFO csbi;
    DWORD                      count;
    DWORD                      cellCount;
    COORD                      homeCoords = { 0, 0 };

    hStdOut = GetStdHandle( STD_OUTPUT_HANDLE );
    if (hStdOut == INVALID_HANDLE_VALUE) return;

    /* Get the number of cells in the current buffer */
    if (!GetConsoleScreenBufferInfo( hStdOut, &csbi )) return;
    cellCount = csbi.dwSize.X *csbi.dwSize.Y;

    /* Fill the entire buffer with spaces */
    if (!FillConsoleOutputCharacter(
      hStdOut,
      (TCHAR) ' ',
      cellCount,
      homeCoords,
      &count
      )) return;

    /* Fill the entire buffer with the current colors and attributes */
    if (!FillConsoleOutputAttribute(
      hStdOut,
      csbi.wAttributes,
      cellCount,
      homeCoords,
      &count
      )) return;

    /* Move the cursor home */
    SetConsoleCursorPosition( hStdOut, homeCoords );    
    }

  //--------------------------------------------------------------------------
  void GoHome()
    {
    HANDLE hStdOut = GetStdHandle( STD_OUTPUT_HANDLE );
    COORD homeCoords = { 0, 0 };
    SetConsoleCursorPosition( hStdOut, homeCoords );
    }

  //--------------------------------------------------------------------------
  void GotoXY( int x, int y )
    {
    HANDLE hStdOut = GetStdHandle( STD_OUTPUT_HANDLE );
    COORD coords = { (SHORT)x, (SHORT)y };
    SetConsoleCursorPosition( hStdOut, coords );
    }

  //--------------------------------------------------------------------------
  bool IsKeyPressed( unsigned timeout_ms = 0 )
    {
    return WaitForSingleObject(
      GetStdHandle( STD_INPUT_HANDLE ),
      timeout_ms
      ) == WAIT_OBJECT_0;
    }

  //--------------------------------------------------------------------------
  // Emit "OEM" codes on Windows
  const char* space = " ";
  const char* block = "\xDB";
  const char* topbk = "\xDF";
  const char* botbk = "\xDC";


//////////////////////////////////////////////////////////////////////////////
#else  // POSIX (presumably)
//////////////////////////////////////////////////////////////////////////////

  #include <unistd.h>
  #include <term.h>
  #include <termios.h>
  #include <sys/ioctl.h>
  #include <poll.h>

  struct termios initial_settings;

  //--------------------------------------------------------------------------
  bool Initialize( int& w, int& h )
    {
    if (!cur_term)
      {
      int result;
      setupterm( NULL, STDOUT_FILENO, &result );
      if (result <= 0) return false;
      }

    struct winsize ws;
    ioctl( 0, TIOCGWINSZ, &ws );
    w = ws.ws_col;
    h = ws.ws_row;

    return (0 == tcgetattr( STDIN_FILENO, &initial_settings ));
    }

  //--------------------------------------------------------------------------
  void Finalize()
    {
    tcsetattr( STDIN_FILENO, TCSANOW, &initial_settings );
    }

  //--------------------------------------------------------------------------
  void ClearScreen()
    {
    putp( tigetstr( "clear" ) );
    }

  //--------------------------------------------------------------------------
  void GoHome()
    {
    putp( tigetstr( "home" ) );
    }

  //--------------------------------------------------------------------------
  void GotoXY( int x, int y )
    {
    putp( tparm( tigetstr( "cup" ), y, x, 0, 0, 0, 0, 0, 0, 0 ) ); 
    }

  //--------------------------------------------------------------------------
  bool IsKeyPressed( unsigned timeout_ms = 0 )
    {
    struct pollfd pls[ 1 ];
    pls[ 0 ].fd     = STDIN_FILENO;
    pls[ 0 ].events = POLLIN | POLLPRI;
    return poll( pls, 1, timeout_ms ) > 0;
    }

  //--------------------------------------------------------------------------
  // Emit UTF-8 codes on Linux
  const char* space = " ";
  const char* block = "\xE2\x96\x88";  // U+2588
  const char* topbk = "\xE2\x96\x80";  // U+2580
  const char* botbk = "\xE2\x96\x84";  // U+2584

#endif
Duthomhas (13200)
(continued)
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/* ///////////////////////////////////////////////////////////////////////////
main program
/////////////////////////////////////////////////////////////////////////// */

#include <algorithm>
#include <iostream>
#include <limits>
#include <sstream>
#include <string>
using namespace std;

//----------------------------------------------------------------------------
bool* board[ 2 ] = { NULL, NULL };
int   active = 0;
int   w, h;

//----------------------------------------------------------------------------
bool& index( int active, int x, int y )
  {
  return *(board[ active ] + ((y + 1) * (w + 2)) + (x + 1));
  }

//----------------------------------------------------------------------------
void draw()
  {
  for (int y = 0; y < h; y += 2)
    {
    for (int x = 0; x < w; x++)
      {
      bool newtop = index( active,     x, y     );
      bool newbot = index( active,     x, y + 1 );
      bool oldtop = index( active ^ 1, x, y     );
      bool oldbot = index( active ^ 1, x, y + 1 );

      if ((newtop != oldtop) or (newbot != oldbot))
        {
        GotoXY( x, (y / 2) + 1 );
        if (newtop && newbot) cout << block;
        else if (newtop)      cout << topbk;
        else if (newbot)      cout << botbk;
        else                  cout << space;
        }
      }
    }
  }

//----------------------------------------------------------------------------
int neighbors( int x, int y )
  {
  int result = 0;
  bool* p = &(index( active, x - 1, y - 1 ));

  result += p[ 0 ] + p[ 1 ] + p[ 2 ];  p += w + 2;
  result += p[ 0 ]          + p[ 2 ];  p += w + 2;
  result += p[ 0 ] + p[ 1 ] + p[ 2 ];

  return result;
  }

//----------------------------------------------------------------------------
void update()
  {
  int inactive = active ^ 1;

  for (int x = 0; x < w; x++)
  for (int y = 0; y < h; y++)
    {
    int n = neighbors( x, y );
    if (index( active, x, y )) index( inactive, x, y ) = (n == 2) || (n == 3);
    else                       index( inactive, x, y ) =             (n == 3);
    }

  active ^= 1;

  fill_n( &(index( active, -1, 0 )), w + 2, false );
  fill_n( &(index( active,  0, h )), w,     false );
  for (int y = 1; y < h; y++)
    {
    index( active, -1, y ) = false;
    index( active,  w, y ) = false;
    }
  }

//----------------------------------------------------------------------------
#define _ 0
bool glider_gun[ 11 ][ 38 ] =
  {
  { _,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_ },
  { _,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,1,_,_,_,_,_,_,_,_,_,_,_,_ },
  { _,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,1,_,1,_,_,_,_,_,_,_,_,_,_,_,_ },
  { _,_,_,_,_,_,_,_,_,_,_,_,_,1,1,_,_,_,_,_,_,1,1,_,_,_,_,_,_,_,_,_,_,_,_,1,1,_ },
  { _,_,_,_,_,_,_,_,_,_,_,_,1,_,_,_,1,_,_,_,_,1,1,_,_,_,_,_,_,_,_,_,_,_,_,1,1,_ },
  { _,1,1,_,_,_,_,_,_,_,_,1,_,_,_,_,_,1,_,_,_,1,1,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_ },
  { _,1,1,_,_,_,_,_,_,_,_,1,_,_,_,1,_,1,1,_,_,_,_,1,_,1,_,_,_,_,_,_,_,_,_,_,_,_ },
  { _,_,_,_,_,_,_,_,_,_,_,1,_,_,_,_,_,1,_,_,_,_,_,_,_,1,_,_,_,_,_,_,_,_,_,_,_,_ },
  { _,_,_,_,_,_,_,_,_,_,_,_,1,_,_,_,1,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_ },
  { _,_,_,_,_,_,_,_,_,_,_,_,_,1,1,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_ },
  { _,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_ },
  };
int ggh = extent                <decltype( glider_gun )>         ::value;
int ggw = extent <remove_extent <decltype( glider_gun )> ::type> ::value;
#undef _

//----------------------------------------------------------------------------
int main()
  {
  if (!Initialize( w, h ))
    {
    cout << "Fooey! I couldn't start terminal control properly.\n";
    return 1;
    }

  w =  (w - 1) & ~1;
  h = ((h - 2) & ~1) * 2;

  if ((ggh > h) || (ggw > w))
    {
    cout << "Hey! Your console must be sized larger than "
         << ggw << " by " << ggh << "!\n";
    return 2;
    }

  cout << "speed in ms (default 150)? ";
  int speed = 150;
  {
  string s;
  getline( cin, s );
  if (!s.empty())
    {
    istringstream ss( s );
    ss >> speed;
    if (!ss.eof() or (speed < 0) or (speed > 2000))
      {
      cout << "Foo, that's not a valid speed!\n";
      return 3;
      }
    }
  }

  board[ 0 ] = new bool[ (w + 2) * (h + 2) ];
  board[ 1 ] = new bool[ (w + 2) * (h + 2) ];

  fill_n( board[ active ], (w + 2) * (h + 2), false );

  ClearScreen();
  string title = "Gosper Glider Gun (press ENTER to quit)";
  cout << title << string( w - title.length(), ' ' ) << "\n";

  for (int y = 0; y < ggh; y++)
  for (int x = 0; x < ggw; x++)
    index( active, x, y ) = glider_gun[ y ][ x ];

  do {
    draw();
    update();
    }
  while (!IsKeyPressed( speed ));
  cin.ignore( numeric_limits <streamsize> ::max(), '\n' );

  delete[] board[ 0 ];
  delete[] board[ 1 ];
  Finalize();
  return 0;
  }

Let me know if you have problems on *nix.
Catfish2 (666)
Works fine on openSUSE 12.1, GCC 4.6.2. Good work...
http://i45.tinypic.com/xp3ng2.png
Duthomhas (13200)
Yay! Thanks!
Catfish2 (666)
I would comment, when it asks for "speed" it's actually asking for "refresh rate". Also, a default speed of <50 would look nicer IMO.
Duthomhas (13200)
It isn't even that. The "speed" is actually the delay time between update-and-refresh cycles. If it takes your terminal longer to refresh than mine, then yours will run more slowly than mine.
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