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  1. /*  $OpenBSD: shapes.c,v 1.8 2004/07/10 07:26:24 deraadt Exp $  */
  2. /*  $NetBSD: shapes.c,v 1.2 1995/04/22 07:42:44 cgd Exp $   */
  3.  
  4. /*-
  5.  * Copyright (c) 1992, 1993
  6.  *  The Regents of the University of California.  All rights reserved.
  7.  *
  8.  * This code is derived from software contributed to Berkeley by
  9.  * Chris Torek and Darren F. Provine.
  10.  *
  11.  * Redistribution and use in source and binary forms, with or without
  12.  * modification, are permitted provided that the following conditions
  13.  * are met:
  14.  * 1. Redistributions of source code must retain the above copyright
  15.  *    notice, this list of conditions and the following disclaimer.
  16.  * 2. Redistributions in binary form must reproduce the above copyright
  17.  *    notice, this list of conditions and the following disclaimer in the
  18.  *    documentation and/or other materials provided with the distribution.
  19.  * 3. Neither the name of the University nor the names of its contributors
  20.  *    may be used to endorse or promote products derived from this software
  21.  *    without specific prior written permission.
  22.  *
  23.  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24.  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25.  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26.  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27.  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28.  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29.  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30.  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31.  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32.  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33.  * SUCH DAMAGE.
  34.  *
  35.  *  @(#)shapes.c    8.1 (Berkeley) 5/31/93
  36.  */
  37.  
  38. /** @addtogroup tetris
  39.  * @{
  40.  */
  41. /** @file
  42.  */
  43.  
  44. /*
  45.  * Tetris shapes and related routines.
  46.  *
  47.  * Note that the first 7 are `well known'.
  48.  */
  49.  
  50. #include <unistd.h>
  51. #include "tetris.h"
  52.  
  53. #define TL  -B_COLS-1   /* top left */
  54. #define TC  -B_COLS     /* top center */
  55. #define TR  -B_COLS+1   /* top right */
  56. #define ML  -1      /* middle left */
  57. #define MR  1       /* middle right */
  58. #define BL  B_COLS-1    /* bottom left */
  59. #define BC  B_COLS      /* bottom center */
  60. #define BR  B_COLS+1    /* bottom right */
  61.  
  62. const struct shape shapes[] = {
  63.     /* 0*/  { 7,    7,  { TL, TC, MR } },
  64.     /* 1*/  { 8,    8,  { TC, TR, ML } },
  65.     /* 2*/  { 9,    11, { ML, MR, BC } },
  66.     /* 3*/  { 3,    3,  { TL, TC, ML } },
  67.     /* 4*/  { 12,   14, { ML, BL, MR } },
  68.     /* 5*/  { 15,   17, { ML, BR, MR } },
  69.     /* 6*/  { 18,   18, { ML, MR, 2  } }, /* sticks out */
  70.     /* 7*/  { 0,    0,  { TC, ML, BL } },
  71.     /* 8*/  { 1,    1,  { TC, MR, BR } },
  72.     /* 9*/  { 10,   2,  { TC, MR, BC } },
  73.     /*10*/  { 11,   9,  { TC, ML, MR } },
  74.     /*11*/  { 2,    10, { TC, ML, BC } },
  75.     /*12*/  { 13,   4,  { TC, BC, BR } },
  76.     /*13*/  { 14,   12, { TR, ML, MR } },
  77.     /*14*/  { 4,    13, { TL, TC, BC } },
  78.     /*15*/  { 16,   5,  { TR, TC, BC } },
  79.     /*16*/  { 17,   15, { TL, MR, ML } },
  80.     /*17*/  { 5,    16, { TC, BC, BL } },
  81.     /*18*/  { 6,    6,  { TC, BC, 2*B_COLS } }/* sticks out */
  82. };
  83.  
  84. /*
  85.  * Return true iff the given shape fits in the given position,
  86.  * taking the current board into account.
  87.  */
  88. int
  89. fits_in(const struct shape *shape, int pos)
  90. {
  91.     int *o = shape->off;
  92.  
  93.     if (board[pos] || board[pos + *o++] || board[pos + *o++] ||
  94.         board[pos + *o])
  95.         return 0;
  96.     return 1;
  97. }
  98.  
  99. /*
  100.  * Write the given shape into the current board, turning it on
  101.  * if `onoff' is 1, and off if `onoff' is 0.
  102.  */
  103. void
  104. place(const struct shape *shape, int pos, int onoff)
  105. {
  106.     int *o = shape->off;
  107.  
  108.     board[pos] = onoff;
  109.     board[pos + *o++] = onoff;
  110.     board[pos + *o++] = onoff;
  111.     board[pos + *o] = onoff;
  112. }
  113.  
  114. /** @}
  115.  */
  116.  
  117.