1 /* $NetBSD: shapes.c,v 1.8 2009/05/25 04:33:53 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 * @(#)shapes.c 8.1 (Berkeley) 5/31/93 35 */ 36 37 /* 38 * Tetris shapes and related routines. 39 * 40 * Note that the first 7 are `well known'. 41 */ 42 43 #include <sys/cdefs.h> 44 #include "tetris.h" 45 46 #define TL -B_COLS-1 /* top left */ 47 #define TC -B_COLS /* top center */ 48 #define TR -B_COLS+1 /* top right */ 49 #define ML -1 /* middle left */ 50 #define MR 1 /* middle right */ 51 #define BL B_COLS-1 /* bottom left */ 52 #define BC B_COLS /* bottom center */ 53 #define BR B_COLS+1 /* bottom right */ 54 55 const struct shape shapes[] = { 56 /* 0*/ { 7, { TL, TC, MR, } }, 57 /* 1*/ { 8, { TC, TR, ML, } }, 58 /* 2*/ { 9, { ML, MR, BC, } }, 59 /* 3*/ { 3, { TL, TC, ML, } }, 60 /* 4*/ { 12, { ML, BL, MR, } }, 61 /* 5*/ { 15, { ML, BR, MR, } }, 62 /* 6*/ { 18, { ML, MR, 2 } }, /* sticks out */ 63 /* 7*/ { 0, { TC, ML, BL, } }, 64 /* 8*/ { 1, { TC, MR, BR, } }, 65 /* 9*/ { 10, { TC, MR, BC, } }, 66 /*10*/ { 11, { TC, ML, MR, } }, 67 /*11*/ { 2, { TC, ML, BC, } }, 68 /*12*/ { 13, { TC, BC, BR, } }, 69 /*13*/ { 14, { TR, ML, MR, } }, 70 /*14*/ { 4, { TL, TC, BC, } }, 71 /*15*/ { 16, { TR, TC, BC, } }, 72 /*16*/ { 17, { TL, MR, ML, } }, 73 /*17*/ { 5, { TC, BC, BL, } }, 74 /*18*/ { 6, { TC, BC, 2*B_COLS } } /* sticks out */ 75 }; 76 77 /* 78 * Return true iff the given shape fits in the given position, 79 * taking the current board into account. 80 */ 81 int 82 fits_in(const struct shape *shape, int pos) 83 { 84 const int *o = shape->off; 85 86 if (board[pos] || board[pos + *o++] || board[pos + *o++] || 87 board[pos + *o]) 88 return 0; 89 return 1; 90 } 91 92 /* 93 * Write the given shape into the current board, turning it on 94 * if `onoff' is 1, and off if `onoff' is 0. 95 */ 96 void 97 place(const struct shape *shape, int pos, int onoff) 98 { 99 const int *o = shape->off; 100 101 board[pos] = onoff; 102 board[pos + *o++] = onoff; 103 board[pos + *o++] = onoff; 104 board[pos + *o] = onoff; 105 } 106