105 lines
3.5 KiB
C
105 lines
3.5 KiB
C
/* $NetBSD: shapes.c,v 1.8 2009/05/25 04:33:53 dholland Exp $ */
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/*-
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek and Darren F. Provine.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)shapes.c 8.1 (Berkeley) 5/31/93
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*/
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/*
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* Tetris shapes and related routines.
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*
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* Note that the first 7 are `well known'.
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*/
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#include <sys/cdefs.h>
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#include "tetris.h"
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#define TL -B_COLS-1 /* top left */
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#define TC -B_COLS /* top center */
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#define TR -B_COLS+1 /* top right */
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#define ML -1 /* middle left */
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#define MR 1 /* middle right */
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#define BL B_COLS-1 /* bottom left */
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#define BC B_COLS /* bottom center */
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#define BR B_COLS+1 /* bottom right */
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const struct shape shapes[] = {
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/* 0*/ { 7, { TL, TC, MR, } },
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/* 1*/ { 8, { TC, TR, ML, } },
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/* 2*/ { 9, { ML, MR, BC, } },
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/* 3*/ { 3, { TL, TC, ML, } },
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/* 4*/ { 12, { ML, BL, MR, } },
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/* 5*/ { 15, { ML, BR, MR, } },
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/* 6*/ { 18, { ML, MR, 2 } }, /* sticks out */
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/* 7*/ { 0, { TC, ML, BL, } },
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/* 8*/ { 1, { TC, MR, BR, } },
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/* 9*/ { 10, { TC, MR, BC, } },
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/*10*/ { 11, { TC, ML, MR, } },
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/*11*/ { 2, { TC, ML, BC, } },
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/*12*/ { 13, { TC, BC, BR, } },
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/*13*/ { 14, { TR, ML, MR, } },
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/*14*/ { 4, { TL, TC, BC, } },
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/*15*/ { 16, { TR, TC, BC, } },
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/*16*/ { 17, { TL, MR, ML, } },
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/*17*/ { 5, { TC, BC, BL, } },
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/*18*/ { 6, { TC, BC, 2*B_COLS } } /* sticks out */
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};
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/*
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* Return true iff the given shape fits in the given position,
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* taking the current board into account.
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*/
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int
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fits_in(const struct shape *shape, int pos)
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{
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const int *o = shape->off;
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if (board[pos] || board[pos + *o++] || board[pos + *o++] ||
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board[pos + *o])
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return 0;
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return 1;
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}
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/*
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* Write the given shape into the current board, turning it on
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* if `onoff' is 1, and off if `onoff' is 0.
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*/
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void
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place(const struct shape *shape, int pos, int onoff)
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{
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const int *o = shape->off;
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board[pos] = onoff;
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board[pos + *o++] = onoff;
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board[pos + *o++] = onoff;
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board[pos + *o] = onoff;
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}
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