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