tetris/tetris.h

   1 /*      $NetBSD: tetris.h,v 1.12 2009/08/12 08:51:21 dholland Exp $     */
   2
   3 /*-
   4  * Copyright (c) 1992, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Chris Torek and Darren F. Provine.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  *      @(#)tetris.h    8.1 (Berkeley) 5/31/93
  35  */
  36
  37 #include <sys/types.h>
  38
  39 /*
  40  * Definitions for Tetris.
  41  */
  42
  43 /*
  44  * The display (`board') is composed of 23 rows of 12 columns of characters
  45  * (numbered 0..22 and 0..11), stored in a single array for convenience.
  46  * Columns 1 to 10 of rows 1 to 20 are the actual playing area, where
  47  * shapes appear.  Columns 0 and 11 are always occupied, as are all
  48  * columns of rows 21 and 22.  Rows 0 and 22 exist as boundary areas
  49  * so that regions `outside' the visible area can be examined without
  50  * worrying about addressing problems.
  51  */
  52
  53         /* the board */
  54 #define B_COLS  12
  55 #define B_ROWS  23
  56 #define B_SIZE  (B_ROWS * B_COLS)
  57
  58 typedef unsigned char cell;
  59 extern cell     board[B_SIZE];  /* 1 => occupied, 0 => empty */
  60
  61         /* the displayed area (rows) */
  62 #define D_FIRST 1
  63 #define D_LAST  22
  64
  65         /* the active area (rows) */
  66 #define A_FIRST 1
  67 #define A_LAST  21
  68
  69 /*
  70  * Minimum display size.
  71  */
  72 #define MINROWS 23
  73 #define MINCOLS 40
  74
  75 extern int      Rows, Cols;     /* current screen size */
  76
  77 /*
  78  * Translations from board coordinates to display coordinates.
  79  * As with board coordinates, display coordiates are zero origin.
  80  */
  81 #define RTOD(x) ((x) - 1)
  82 #define CTOD(x) ((x) * 2 + (((Cols - 2 * B_COLS) >> 1) - 1))
  83
  84 /*
  85  * A `shape' is the fundamental thing that makes up the game.  There
  86  * are 7 basic shapes, each consisting of four `blots':
  87  *
  88  *      X.X       X.X           X.X
  89  *        X.X   X.X     X.X.X   X.X     X.X.X   X.X.X   X.X.X.X
  90  *                        X             X           X
  91  *
  92  *        0       1       2       3       4       5       6
  93  *
  94  * Except for 3 and 6, the center of each shape is one of the blots.
  95  * This blot is designated (0,0).  The other three blots can then be
  96  * described as offsets from the center.  Shape 3 is the same under
  97  * rotation, so its center is effectively irrelevant; it has been chosen
  98  * so that it `sticks out' upward and leftward.  Except for shape 6,
  99  * all the blots are contained in a box going from (-1,-1) to (+1,+1);
 100  * shape 6's center `wobbles' as it rotates, so that while it `sticks out'
 101  * rightward, its rotation---a vertical line---`sticks out' downward.
 102  * The containment box has to include the offset (2,0), making the overall
 103  * containment box range from offset (-1,-1) to (+2,+1).  (This is why
 104  * there is only one row above, but two rows below, the display area.)
 105  *
 106  * The game works by choosing one of these shapes at random and putting
 107  * its center at the middle of the first display row (row 1, column 5).
 108  * The shape is moved steadily downward until it collides with something:
 109  * either  another shape, or the bottom of the board.  When the shape can
 110  * no longer be moved downwards, it is merged into the current board.
 111  * At this time, any completely filled rows are elided, and blots above
 112  * these rows move down to make more room.  A new random shape is again
 113  * introduced at the top of the board, and the whole process repeats.
 114  * The game ends when the new shape will not fit at (1,5).
 115  *
 116  * While the shapes are falling, the user can rotate them counterclockwise
 117  * 90 degrees (in addition to moving them left or right), provided that the
 118  * rotation puts the blots in empty spaces.  The table of shapes is set up
 119  * so that each shape contains the index of the new shape obtained by
 120  * rotating the current shape.  Due to symmetry, each shape has exactly
 121  * 1, 2, or 4 rotations total; the first 7 entries in the table represent
 122  * the primary shapes, and the remaining 12 represent their various
 123  * rotated forms.
 124  */
 125 struct shape {
 126         int     rot;    /* index of rotated version of this shape */
 127         int     off[3]; /* offsets to other blots if center is at (0,0) */
 128 };
 129
 130 extern const struct shape shapes[];
 131 #define randshape() (&shapes[random() % 7])
 132
 133 extern const struct shape *nextshape;
 134
 135 /*
 136  * Shapes fall at a rate faster than once per second.
 137  *
 138  * The initial rate is determined by dividing 1 million microseconds
 139  * by the game `level'.  (This is at most 1 million, or one second.)
 140  * Each time the fall-rate is used, it is decreased a little bit,
 141  * depending on its current value, via the `faster' macro below.
 142  * The value eventually reaches a limit, and things stop going faster,
 143  * but by then the game is utterly impossible.
 144  */
 145 extern long     fallrate;       /* less than 1 million; smaller => faster */
 146 #define faster() (fallrate -= fallrate / 3000)
 147
 148 /*
 149  * Game level must be between 1 and 9.  This controls the initial fall rate
 150  * and affects scoring.
 151  */
 152 #define MINLEVEL        1
 153 #define MAXLEVEL        9
 154
 155 /*
 156  * Scoring is as follows:
 157  *
 158  * When the shape comes to rest, and is integrated into the board,
 159  * we score one point.  If the shape is high up (at a low-numbered row),
 160  * and the user hits the space bar, the shape plummets all the way down,
 161  * and we score a point for each row it falls (plus one more as soon as
 162  * we find that it is at rest and integrate it---until then, it can
 163  * still be moved or rotated).
 164  */
 165 extern int      score;          /* the obvious thing */
 166 extern gid_t    gid, egid;
 167
 168 extern char     key_msg[100];
 169 extern int      showpreview;
 170
 171 int     fits_in(const struct shape *, int);
 172 void    place(const struct shape *, int, int);
 173 void    stop(const char *) __dead;