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| 1419 | jermar | 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 $ */ |
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| 3 | |||
| 4 | /*- |
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| 5 | * Copyright (c) 1992, 1993 |
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| 6 | * The Regents of the University of California. All rights reserved. |
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| 7 | * |
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| 8 | * This code is derived from software contributed to Berkeley by |
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| 9 | * Chris Torek and Darren F. Provine. |
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| 10 | * |
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| 11 | * Redistribution and use in source and binary forms, with or without |
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| 12 | * modification, are permitted provided that the following conditions |
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| 13 | * are met: |
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| 14 | * 1. Redistributions of source code must retain the above copyright |
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| 15 | * notice, this list of conditions and the following disclaimer. |
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| 16 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 17 | * notice, this list of conditions and the following disclaimer in the |
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| 18 | * documentation and/or other materials provided with the distribution. |
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| 19 | * 3. Neither the name of the University nor the names of its contributors |
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| 20 | * may be used to endorse or promote products derived from this software |
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| 21 | * without specific prior written permission. |
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| 22 | * |
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| 23 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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| 24 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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| 27 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 28 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 29 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 30 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 31 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 32 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 33 | * SUCH DAMAGE. |
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| 34 | * |
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| 35 | * @(#)shapes.c 8.1 (Berkeley) 5/31/93 |
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| 36 | */ |
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| 37 | |||
| 38 | /* |
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| 39 | * Tetris shapes and related routines. |
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| 40 | * |
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| 41 | * Note that the first 7 are `well known'. |
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| 42 | */ |
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| 43 | |||
| 44 | #include <unistd.h> |
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| 45 | #include "tetris.h" |
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| 46 | |||
| 47 | #define TL -B_COLS-1 /* top left */ |
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| 48 | #define TC -B_COLS /* top center */ |
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| 49 | #define TR -B_COLS+1 /* top right */ |
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| 50 | #define ML -1 /* middle left */ |
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| 51 | #define MR 1 /* middle right */ |
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| 52 | #define BL B_COLS-1 /* bottom left */ |
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| 53 | #define BC B_COLS /* bottom center */ |
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| 54 | #define BR B_COLS+1 /* bottom right */ |
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| 55 | |||
| 56 | const struct shape shapes[] = { |
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| 57 | /* 0*/ { 7, 7, { TL, TC, MR } }, |
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| 58 | /* 1*/ { 8, 8, { TC, TR, ML } }, |
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| 59 | /* 2*/ { 9, 11, { ML, MR, BC } }, |
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| 60 | /* 3*/ { 3, 3, { TL, TC, ML } }, |
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| 61 | /* 4*/ { 12, 14, { ML, BL, MR } }, |
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| 62 | /* 5*/ { 15, 17, { ML, BR, MR } }, |
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| 63 | /* 6*/ { 18, 18, { ML, MR, 2 } }, /* sticks out */ |
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| 64 | /* 7*/ { 0, 0, { TC, ML, BL } }, |
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| 65 | /* 8*/ { 1, 1, { TC, MR, BR } }, |
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| 66 | /* 9*/ { 10, 2, { TC, MR, BC } }, |
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| 67 | /*10*/ { 11, 9, { TC, ML, MR } }, |
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| 68 | /*11*/ { 2, 10, { TC, ML, BC } }, |
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| 69 | /*12*/ { 13, 4, { TC, BC, BR } }, |
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| 70 | /*13*/ { 14, 12, { TR, ML, MR } }, |
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| 71 | /*14*/ { 4, 13, { TL, TC, BC } }, |
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| 72 | /*15*/ { 16, 5, { TR, TC, BC } }, |
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| 73 | /*16*/ { 17, 15, { TL, MR, ML } }, |
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| 74 | /*17*/ { 5, 16, { TC, BC, BL } }, |
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| 75 | /*18*/ { 6, 6, { TC, BC, 2*B_COLS } }/* sticks out */ |
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| 76 | }; |
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| 77 | |||
| 78 | /* |
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| 79 | * Return true iff the given shape fits in the given position, |
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| 80 | * taking the current board into account. |
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| 81 | */ |
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| 82 | int |
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| 83 | fits_in(const struct shape *shape, int pos) |
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| 84 | { |
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| 85 | int *o = shape->off; |
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| 86 | |||
| 87 | if (board[pos] || board[pos + *o++] || board[pos + *o++] || |
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| 88 | board[pos + *o]) |
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| 89 | return 0; |
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| 90 | return 1; |
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| 91 | } |
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| 92 | |||
| 93 | /* |
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| 94 | * Write the given shape into the current board, turning it on |
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| 95 | * if `onoff' is 1, and off if `onoff' is 0. |
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| 96 | */ |
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| 97 | void |
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| 98 | place(const struct shape *shape, int pos, int onoff) |
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| 99 | { |
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| 100 | int *o = shape->off; |
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| 101 | |||
| 102 | board[pos] = onoff; |
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| 103 | board[pos + *o++] = onoff; |
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| 104 | board[pos + *o++] = onoff; |
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| 105 | board[pos + *o] = onoff; |
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| 106 | } |