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/*  $OpenBSD: tetris.h,v 1.9 2003/06/03 03:01:41 millert Exp $  */

/*  $NetBSD: tetris.h,v 1.2 1995/04/22 07:42:48 cgd Exp $   */

/*-

 * Copyright (c) 1992, 1993

 *  The Regents of the University of California.  All rights reserved.

 *

 * This code is derived from software contributed to Berkeley by

 * Chris Torek and Darren F. Provine.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 *

 *  @(#)tetris.h    8.1 (Berkeley) 5/31/93

 */

/** @addtogroup tetris

 * @{

 */

/** @file

 */

/*

 * Definitions for Tetris.

 */

/*

 * The display (`board') is composed of 23 rows of 12 columns of characters

 * (numbered 0..22 and 0..11), stored in a single array for convenience.

 * Columns 1 to 10 of rows 1 to 20 are the actual playing area, where

 * shapes appear.  Columns 0 and 11 are always occupied, as are all

 * columns of rows 21 and 22.  Rows 0 and 22 exist as boundary areas

 * so that regions `outside' the visible area can be examined without

 * worrying about addressing problems.

 */

/* The board */

#define B_COLS  12

#define B_ROWS  23

#define B_SIZE  (B_ROWS * B_COLS)

typedef uint32_t cell;

extern cell board[B_SIZE];  /* 1 => occupied, 0 => empty */

/* The displayed area (rows) */

#define D_FIRST  1

#define D_LAST   22

/* The active area (rows) */

#define A_FIRST  1

#define A_LAST   21

/*

 * Minimum display size.

 */

#define MINROWS  23

#define MINCOLS  40

/* Current screen size */

extern int Rows;

extern int Cols;

/*

 * Translations from board coordinates to display coordinates.

 * As with board coordinates, display coordiates are zero origin.

 */

#define RTOD(x)  ((x) - 1)

#define CTOD(x)  ((x) * 2 + (((Cols - 2 * B_COLS) >> 1) - 1))

/*

 * A `shape' is the fundamental thing that makes up the game.  There

 * are 7 basic shapes, each consisting of four `blots':

 *

 *      X.X       X.X           X.X

 *        X.X   X.X     X.X.X   X.X     X.X.X   X.X.X   X.X.X.X

 *                        X             X           X

 *

 *          0     1       2       3       4       5       6

 *

 * Except for 3 and 6, the center of each shape is one of the blots.

 * This blot is designated (0, 0).  The other three blots can then be

 * described as offsets from the center.  Shape 3 is the same under

 * rotation, so its center is effectively irrelevant; it has been chosen

 * so that it `sticks out' upward and leftward.  Except for shape 6,

 * all the blots are contained in a box going from (-1, -1) to (+1, +1);

 * shape 6's center `wobbles' as it rotates, so that while it `sticks out'

 * rightward, its rotation---a vertical line---`sticks out' downward.

 * The containment box has to include the offset (2, 0), making the overall

 * containment box range from offset (-1, -1) to (+2, +1).  (This is why

 * there is only one row above, but two rows below, the display area.)

 *

 * The game works by choosing one of these shapes at random and putting

 * its center at the middle of the first display row (row 1, column 5).

 * The shape is moved steadily downward until it collides with something:

 * either  another shape, or the bottom of the board.  When the shape can

 * no longer be moved downwards, it is merged into the current board.

 * At this time, any completely filled rows are elided, and blots above

 * these rows move down to make more room.  A new random shape is again

 * introduced at the top of the board, and the whole process repeats.

 * The game ends when the new shape will not fit at (1, 5).

 *

 * While the shapes are falling, the user can rotate them counterclockwise

 * 90 degrees (in addition to moving them left or right), provided that the

 * rotation puts the blots in empty spaces.  The table of shapes is set up

 * so that each shape contains the index of the new shape obtained by

 * rotating the current shape.  Due to symmetry, each shape has exactly

 * 1, 2, or 4 rotations total; the first 7 entries in the table represent

 * the primary shapes, and the remaining 12 represent their various

 * rotated forms.

 */

struct shape {

    int rot;     /* index of rotated version of this shape */

    int rotc;    /* -- " -- in classic version  */

    int off[3];  /* offsets to other blots if center is at (0,0) */

    uint32_t color;

};

extern const struct shape shapes[];

extern const struct shape *curshape;

extern const struct shape *nextshape;

/*

 * Shapes fall at a rate faster than once per second.

 *

 * The initial rate is determined by dividing 1 million microseconds

 * by the game `level'.  (This is at most 1 million, or one second.)

 * Each time the fall-rate is used, it is decreased a little bit,

 * depending on its current value, via the `faster' macro below.

 * The value eventually reaches a limit, and things stop going faster,

 * but by then the game is utterly impossible.

 */

extern long fallrate;  /* less than 1 million; smaller => faster */

#define faster()  (fallrate -= fallrate / 3000)

/*

 * Game level must be between 1 and 9.  This controls the initial fall rate

 * and affects scoring.

 */

#define MINLEVEL  1

#define MAXLEVEL  9

/*

 * Scoring is as follows:

 *

 * When the shape comes to rest, and is integrated into the board,

 * we score one point.  If the shape is high up (at a low-numbered row),

 * and the user hits the space bar, the shape plummets all the way down,

 * and we score a point for each row it falls (plus one more as soon as

 * we find that it is at rest and integrate it---until then, it can

 * still be moved or rotated).

 *

 * If previewing has been turned on, the score is multiplied by PRE_PENALTY.

 */

#define PRE_PENALTY  0.75

extern int score;  /* The obvious thing */

extern char key_msg[100];

extern int showpreview;

extern int classic;

extern int fits_in(const struct shape *, int);

extern void place(const struct shape *, int, int);

extern void stop(char *);

/** @}

 */