1 /* $NetBSD: shapes.c,v 1.4 1999/09/08 21:18:01 jsm 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. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)shapes.c 8.1 (Berkeley) 5/31/93 39 */ 40 41 /* 42 * Tetris shapes and related routines. 43 * 44 * Note that the first 7 are `well known'. 45 */ 46 47 #include <sys/cdefs.h> 48 #include "tetris.h" 49 50 #define TL -B_COLS-1 /* top left */ 51 #define TC -B_COLS /* top center */ 52 #define TR -B_COLS+1 /* top right */ 53 #define ML -1 /* middle left */ 54 #define MR 1 /* middle right */ 55 #define BL B_COLS-1 /* bottom left */ 56 #define BC B_COLS /* bottom center */ 57 #define BR B_COLS+1 /* bottom right */ 58 59 const struct shape shapes[] = { 60 /* 0*/ { 7, { TL, TC, MR, } }, 61 /* 1*/ { 8, { TC, TR, ML, } }, 62 /* 2*/ { 9, { ML, MR, BC, } }, 63 /* 3*/ { 3, { TL, TC, ML, } }, 64 /* 4*/ { 12, { ML, BL, MR, } }, 65 /* 5*/ { 15, { ML, BR, MR, } }, 66 /* 6*/ { 18, { ML, MR, 2 } }, /* sticks out */ 67 /* 7*/ { 0, { TC, ML, BL, } }, 68 /* 8*/ { 1, { TC, MR, BR, } }, 69 /* 9*/ { 10, { TC, MR, BC, } }, 70 /*10*/ { 11, { TC, ML, MR, } }, 71 /*11*/ { 2, { TC, ML, BC, } }, 72 /*12*/ { 13, { TC, BC, BR, } }, 73 /*13*/ { 14, { TR, ML, MR, } }, 74 /*14*/ { 4, { TL, TC, BC, } }, 75 /*15*/ { 16, { TR, TC, BC, } }, 76 /*16*/ { 17, { TL, MR, ML, } }, 77 /*17*/ { 5, { TC, BC, BL, } }, 78 /*18*/ { 6, { TC, BC, 2*B_COLS } } /* sticks out */ 79 }; 80 81 /* 82 * Return true iff the given shape fits in the given position, 83 * taking the current board into account. 84 */ 85 int 86 fits_in(shape, pos) 87 const struct shape *shape; 88 register int pos; 89 { 90 register int *o = shape->off; 91 92 if (board[pos] || board[pos + *o++] || board[pos + *o++] || 93 board[pos + *o]) 94 return 0; 95 return 1; 96 } 97 98 /* 99 * Write the given shape into the current board, turning it on 100 * if `onoff' is 1, and off if `onoff' is 0. 101 */ 102 void 103 place(shape, pos, onoff) 104 const struct shape *shape; 105 register int pos, onoff; 106 { 107 register int *o = shape->off; 108 109 board[pos] = onoff; 110 board[pos + *o++] = onoff; 111 board[pos + *o++] = onoff; 112 board[pos + *o] = onoff; 113 } 114