| 1 | /*
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| 2 | * Copyright (c) 2011 Martin Decky
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** Attributations
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| 30 | *
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| 31 | * shapes.c 8.1 (Berkeley) 5/31/93
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| 32 | * NetBSD: shapes.c,v 1.2 1995/04/22 07:42:44 cgd
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| 33 | * OpenBSD: shapes.c,v 1.8 2004/07/10 07:26:24 deraadt
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| 34 | *
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| 35 | * Based upon BSD Tetris
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| 36 | *
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| 37 | * Copyright (c) 1992, 1993
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| 38 | * The Regents of the University of California.
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| 39 | * Distributed under BSD license.
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| 40 | *
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| 41 | * This code is derived from software contributed to Berkeley by
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| 42 | * Chris Torek and Darren F. Provine.
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| 43 | *
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| 44 | */
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| 45 |
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| 46 | /** @addtogroup tetris
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| 47 | * @{
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| 48 | */
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| 49 | /** @file
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| 50 | */
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| 51 |
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| 52 | /*
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| 53 | * Tetris shapes and related routines.
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| 54 | *
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| 55 | * Note that the first 7 are `well known'.
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| 56 | */
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| 57 |
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| 58 | #include <unistd.h>
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| 59 | #include "tetris.h"
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| 60 |
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| 61 | #define TL (-B_COLS - 1) /* top left */
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| 62 | #define TC (-B_COLS) /* top center */
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| 63 | #define TR (-B_COLS + 1) /* top right */
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| 64 | #define ML -1 /* middle left */
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| 65 | #define MR 1 /* middle right */
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| 66 | #define BL (B_COLS - 1) /* bottom left */
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| 67 | #define BC B_COLS /* bottom center */
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| 68 | #define BR (B_COLS + 1) /* bottom right */
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| 69 |
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| 70 | const struct shape shapes[] = {
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| 71 | /* 0 */ { 7, 7, { TL, TC, MR }, 0xff042d},
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| 72 | /* 1 */ { 8, 8, { TC, TR, ML }, 0xff9304},
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| 73 | /* 2 */ { 9, 11, { ML, MR, BC }, 0xbeff04},
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| 74 | /* 3 */ { 3, 3, { TL, TC, ML }, 0x63ff04},
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| 75 | /* 4 */ { 12, 14, { ML, BL, MR }, 0xce04ff},
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| 76 | /* 5 */ { 15, 17, { ML, BR, MR }, 0xff04cf},
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| 77 | /* 6 */ { 18, 18, { ML, MR, 2 }, 0x7604ff}, /* sticks out */
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| 78 | /* 7 */ { 0, 0, { TC, ML, BL }, 0xff042d},
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| 79 | /* 8 */ { 1, 1, { TC, MR, BR }, 0xff9304},
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| 80 | /* 9 */ { 10, 2, { TC, MR, BC }, 0xbeff04},
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| 81 | /* 10 */ { 11, 9, { TC, ML, MR }, 0xbeff04},
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| 82 | /* 11 */ { 2, 10, { TC, ML, BC }, 0xbeff04},
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| 83 | /* 12 */ { 13, 4, { TC, BC, BR }, 0xce04ff},
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| 84 | /* 13 */ { 14, 12, { TR, ML, MR }, 0xce04ff},
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| 85 | /* 14 */ { 4, 13, { TL, TC, BC }, 0xce04ff},
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| 86 | /* 15 */ { 16, 5, { TR, TC, BC }, 0xff04cf},
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| 87 | /* 16 */ { 17, 15, { TL, MR, ML }, 0xff04cf},
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| 88 | /* 17 */ { 5, 16, { TC, BC, BL }, 0xff04cf},
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| 89 | /* 18 */ { 6, 6, { TC, BC, 2 * B_COLS }, 0x7604ff} /* sticks out */
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| 90 | };
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| 91 |
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| 92 | /*
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| 93 | * Return true iff the given shape fits in the given position,
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| 94 | * taking the current board into account.
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| 95 | */
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| 96 | int fits_in(const struct shape *shape, int pos)
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| 97 | {
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| 98 | const int *o = shape->off;
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| 99 |
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| 100 | if ((board[pos]) || (board[pos + *o++]) || (board[pos + *o++]) ||
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| 101 | (board[pos + *o]))
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| 102 | return 0;
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| 103 |
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| 104 | return 1;
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| 105 | }
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| 106 |
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| 107 | /*
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| 108 | * Write the given shape into the current board, turning it on
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| 109 | * if `onoff' is 1, and off if `onoff' is 0.
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| 110 | */
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| 111 | void place(const struct shape *shape, int pos, int onoff)
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| 112 | {
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| 113 | const int *o = shape->off;
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| 114 |
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| 115 | board[pos] = onoff ? shape->color : 0x000000;
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| 116 | board[pos + *o++] = onoff ? shape->color : 0x000000;
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| 117 | board[pos + *o++] = onoff ? shape->color : 0x000000;
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| 118 | board[pos + *o] = onoff ? shape->color : 0x000000;
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| 119 | }
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| 120 |
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| 121 | /** @}
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| 122 | */
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