1 /* $NetBSD: shapes.c,v 1.9 2014/06/11 16:47:39 christos 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, 7, { TL, TC, MR, } },
57 /* 1*/ { 1, 8, { TC, TR, ML, } },
58 /* 2*/ { 2, 9, { ML, MR, BC, } },
59 /* 3*/ { 3, 3, { TL, TC, ML, } },
60 /* 4*/ { 4, 12, { ML, BL, MR, } },
61 /* 5*/ { 5, 15, { ML, BR, MR, } },
62 /* 6*/ { 6, 18, { ML, MR, 2 } }, /* sticks out */
63 /* 7*/ { 7, 0, { TC, ML, BL, } },
64 /* 8*/ { 1, 1, { TC, MR, BR, } },
65 /* 9*/ { 2, 10, { TC, MR, BC, } },
66 /*10*/ { 2, 11, { TC, ML, MR, } },
67 /*11*/ { 2, 2, { TC, ML, BC, } },
68 /*12*/ { 4, 13, { TC, BC, BR, } },
69 /*13*/ { 4, 14, { TR, ML, MR, } },
70 /*14*/ { 4, 4, { TL, TC, BC, } },
71 /*15*/ { 5, 16, { TR, TC, BC, } },
72 /*16*/ { 5, 17, { TL, MR, ML, } },
73 /*17*/ { 5, 5, { TC, BC, BL, } },
74 /*18*/ { 6, 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
fits_in(const struct shape * shape,int pos)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
place(const struct shape * shape,int pos,int onoff)97 place(const struct shape *shape, int pos, int onoff)
98 {
99 const int *o = shape->off;
100 onoff = onoff ? shape->color : 0;
101
102 board[pos] = onoff;
103 board[pos + *o++] = onoff;
104 board[pos + *o++] = onoff;
105 board[pos + *o] = onoff;
106 }
107