1 /* $OpenBSD: shapes.c,v 1.10 2016/01/04 17:33:24 mestre 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 /* 39 * Tetris shapes and related routines. 40 * 41 * Note that the first 7 are `well known'. 42 */ 43 44 #include <unistd.h> 45 46 #include "tetris.h" 47 48 #define TL -B_COLS-1 /* top left */ 49 #define TC -B_COLS /* top center */ 50 #define TR -B_COLS+1 /* top right */ 51 #define ML -1 /* middle left */ 52 #define MR 1 /* middle right */ 53 #define BL B_COLS-1 /* bottom left */ 54 #define BC B_COLS /* bottom center */ 55 #define BR B_COLS+1 /* bottom right */ 56 57 const struct shape shapes[] = { 58 /* 0*/ { 7, 7, { TL, TC, MR } }, 59 /* 1*/ { 8, 8, { TC, TR, ML } }, 60 /* 2*/ { 9, 11, { ML, MR, BC } }, 61 /* 3*/ { 3, 3, { TL, TC, ML } }, 62 /* 4*/ { 12, 14, { ML, BL, MR } }, 63 /* 5*/ { 15, 17, { ML, BR, MR } }, 64 /* 6*/ { 18, 18, { ML, MR, 2 } }, /* sticks out */ 65 /* 7*/ { 0, 0, { TC, ML, BL } }, 66 /* 8*/ { 1, 1, { TC, MR, BR } }, 67 /* 9*/ { 10, 2, { TC, MR, BC } }, 68 /*10*/ { 11, 9, { TC, ML, MR } }, 69 /*11*/ { 2, 10, { TC, ML, BC } }, 70 /*12*/ { 13, 4, { TC, BC, BR } }, 71 /*13*/ { 14, 12, { TR, ML, MR } }, 72 /*14*/ { 4, 13, { TL, TC, BC } }, 73 /*15*/ { 16, 5, { TR, TC, BC } }, 74 /*16*/ { 17, 15, { TL, MR, ML } }, 75 /*17*/ { 5, 16, { TC, BC, BL } }, 76 /*18*/ { 6, 6, { TC, BC, 2*B_COLS } }/* sticks out */ 77 }; 78 79 /* 80 * Return true iff the given shape fits in the given position, 81 * taking the current board into account. 82 */ 83 int 84 fits_in(const struct shape *shape, int pos) 85 { 86 const int *o = shape->off; 87 88 if (board[pos] || board[pos + *o++] || board[pos + *o++] || 89 board[pos + *o]) 90 return 0; 91 return 1; 92 } 93 94 /* 95 * Write the given shape into the current board, turning it on 96 * if `onoff' is 1, and off if `onoff' is 0. 97 */ 98 void 99 place(const struct shape *shape, int pos, int onoff) 100 { 101 const int *o = shape->off; 102 103 board[pos] = onoff; 104 board[pos + *o++] = onoff; 105 board[pos + *o++] = onoff; 106 board[pos + *o] = onoff; 107 } 108