1 /* $NetBSD: tetris.h,v 1.16 2020/07/21 02:42:05 nia 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 extern int Offset; /* vert. offset to center board */ 77 78 /* 79 * Translations from board coordinates to display coordinates. 80 * As with board coordinates, display coordiates are zero origin. 81 */ 82 #define RTOD(x) ((x) - 1) 83 #define CTOD(x) ((x) * 2 + (((Cols - 2 * B_COLS) >> 1) - 1)) 84 85 /* 86 * A `shape' is the fundamental thing that makes up the game. There 87 * are 7 basic shapes, each consisting of four `blots': 88 * 89 * X.X X.X X.X 90 * X.X X.X X.X.X X.X X.X.X X.X.X X.X.X.X 91 * X X X 92 * 93 * 0 1 2 3 4 5 6 94 * 95 * Except for 3 and 6, the center of each shape is one of the blots. 96 * This blot is designated (0,0). The other three blots can then be 97 * described as offsets from the center. Shape 3 is the same under 98 * rotation, so its center is effectively irrelevant; it has been chosen 99 * so that it `sticks out' upward and leftward. Except for shape 6, 100 * all the blots are contained in a box going from (-1,-1) to (+1,+1); 101 * shape 6's center `wobbles' as it rotates, so that while it `sticks out' 102 * rightward, its rotation---a vertical line---`sticks out' downward. 103 * The containment box has to include the offset (2,0), making the overall 104 * containment box range from offset (-1,-1) to (+2,+1). (This is why 105 * there is only one row above, but two rows below, the display area.) 106 * 107 * The game works by choosing one of these shapes at random and putting 108 * its center at the middle of the first display row (row 1, column 5). 109 * The shape is moved steadily downward until it collides with something: 110 * either another shape, or the bottom of the board. When the shape can 111 * no longer be moved downwards, it is merged into the current board. 112 * At this time, any completely filled rows are elided, and blots above 113 * these rows move down to make more room. A new random shape is again 114 * introduced at the top of the board, and the whole process repeats. 115 * The game ends when the new shape will not fit at (1,5). 116 * 117 * While the shapes are falling, the user can rotate them counterclockwise 118 * 90 degrees (in addition to moving them left or right), provided that the 119 * rotation puts the blots in empty spaces. The table of shapes is set up 120 * so that each shape contains the index of the new shape obtained by 121 * rotating the current shape. Due to symmetry, each shape has exactly 122 * 1, 2, or 4 rotations total; the first 7 entries in the table represent 123 * the primary shapes, and the remaining 12 represent their various 124 * rotated forms. 125 */ 126 struct shape { 127 int color; 128 int rot; /* index of rotated version of this shape */ 129 int off[3]; /* offsets to other blots if center is at (0,0) */ 130 }; 131 132 extern const struct shape shapes[]; 133 #define randshape() (&shapes[arc4random_uniform(7)]) 134 135 extern const struct shape *nextshape; 136 137 /* 138 * Shapes fall at a rate faster than once per second. 139 * 140 * The initial rate is determined by dividing 1 million microseconds 141 * by the game `level'. (This is at most 1 million, or one second.) 142 * Each time the fall-rate is used, it is decreased a little bit, 143 * depending on its current value, via the `faster' macro below. 144 * The value eventually reaches a limit, and things stop going faster, 145 * but by then the game is utterly impossible. 146 */ 147 extern long fallrate; /* less than 1 million; smaller => faster */ 148 #define faster() (fallrate -= fallrate / 3000) 149 150 /* 151 * Game level must be between 1 and 9. This controls the initial fall rate 152 * and affects scoring. 153 */ 154 #define MINLEVEL 1 155 #define MAXLEVEL 9 156 157 /* 158 * Scoring is as follows: 159 * 160 * When the shape comes to rest, and is integrated into the board, 161 * we score one point. If the shape is high up (at a low-numbered row), 162 * and the user hits the space bar, the shape plummets all the way down, 163 * and we score a point for each row it falls (plus one more as soon as 164 * we find that it is at rest and integrate it---until then, it can 165 * still be moved or rotated). 166 */ 167 extern int score; /* the obvious thing */ 168 extern gid_t gid, egid; 169 170 extern char key_msg[100]; 171 extern int showpreview; 172 extern int nocolor; 173 174 int fits_in(const struct shape *, int); 175 void place(const struct shape *, int, int); 176 void stop(const char *) __dead; 177