112 lines
3.5 KiB
C
112 lines
3.5 KiB
C
/*-
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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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, /* sticks out */ 2,
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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, /* sticks out */ 2*B_COLS,
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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(shape, pos)
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struct shape *shape;
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register int pos;
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{
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register 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(shape, pos, onoff)
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struct shape *shape;
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register int pos, onoff;
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{
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register 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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