/* $OpenBSD: shapes.c,v 1.8 2004/07/10 07:26:24 deraadt Exp $ */
/* $NetBSD: shapes.c,v 1.2 1995/04/22 07:42:44 cgd Exp $ */
/*-
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Chris Torek and Darren F. Provine.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)shapes.c 8.1 (Berkeley) 5/31/93
*/
/*
* Tetris shapes and related routines.
*
* Note that the first 7 are `well known'.
*/
#include <unistd.h>
#include "tetris.h"
#define TL -B_COLS-1 /* top left */
#define TC -B_COLS /* top center */
#define TR -B_COLS+1 /* top right */
#define ML -1 /* middle left */
#define MR 1 /* middle right */
#define BL B_COLS-1 /* bottom left */
#define BC B_COLS /* bottom center */
#define BR B_COLS+1 /* bottom right */
const struct shape shapes[] = {
/* 0*/ { 7, 7, { TL, TC, MR } },
/* 1*/ { 8, 8, { TC, TR, ML } },
/* 2*/ { 9, 11, { ML, MR, BC } },
/* 3*/ { 3, 3, { TL, TC, ML } },
/* 4*/ { 12, 14, { ML, BL, MR } },
/* 5*/ { 15, 17, { ML, BR, MR } },
/* 6*/ { 18, 18, { ML, MR, 2 } }, /* sticks out */
/* 7*/ { 0, 0, { TC, ML, BL } },
/* 8*/ { 1, 1, { TC, MR, BR } },
/* 9*/ { 10, 2, { TC, MR, BC } },
/*10*/ { 11, 9, { TC, ML, MR } },
/*11*/ { 2, 10, { TC, ML, BC } },
/*12*/ { 13, 4, { TC, BC, BR } },
/*13*/ { 14, 12, { TR, ML, MR } },
/*14*/ { 4, 13, { TL, TC, BC } },
/*15*/ { 16, 5, { TR, TC, BC } },
/*16*/ { 17, 15, { TL, MR, ML } },
/*17*/ { 5, 16, { TC, BC, BL } },
/*18*/ { 6, 6, { TC, BC, 2*B_COLS } }/* sticks out */
};
/*
* Return true iff the given shape fits in the given position,
* taking the current board into account.
*/
int
fits_in(const struct shape *shape, int pos)
{
int *o = shape->off;
if (board[pos] || board[pos + *o++] || board[pos + *o++] ||
board[pos + *o])
return 0;
return 1;
}
/*
* Write the given shape into the current board, turning it on
* if `onoff' is 1, and off if `onoff' is 0.
*/
void
place(const struct shape *shape, int pos, int onoff)
{
int *o = shape->off;
board[pos] = onoff;
board[pos + *o++] = onoff;
board[pos + *o++] = onoff;
board[pos + *o] = onoff;
}