/*
* Copyright (c) 2011 Martin Decky
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - 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.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/** Attributations
*
* shapes.c 8.1 (Berkeley) 5/31/93
* NetBSD: shapes.c,v 1.2 1995/04/22 07:42:44 cgd
* OpenBSD: shapes.c,v 1.8 2004/07/10 07:26:24 deraadt
*
* Based upon BSD Tetris
*
* Copyright (c) 1992, 1993
* The Regents of the University of California.
* Distributed under BSD license.
*
* This code is derived from software contributed to Berkeley by
* Chris Torek and Darren F. Provine.
*
*/
/** @addtogroup tetris
* @{
*/
/** @file
*/
/*
* Tetris shapes and related routines.
*
* Note that the first 7 are `well known'.
*/
#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 }, 0x00aaaa },
/* 1 */ { 8, 8, { TC, TR, ML }, 0x00aa00 },
/* 2 */ { 9, 11, { ML, MR, BC }, 0xaa5500 },
/* 3 */ { 3, 3, { TL, TC, ML }, 0x0000aa },
/* 4 */ { 12, 14, { ML, BL, MR }, 0xaa00aa },
/* 5 */ { 15, 17, { ML, BR, MR }, 0xffa500 },
/* 6 */ { 18, 18, { ML, MR, 2 }, 0xaa0000 }, /* sticks out */
/* 7 */ { 0, 0, { TC, ML, BL }, 0x00aaaa },
/* 8 */ { 1, 1, { TC, MR, BR }, 0x00aa00 },
/* 9 */ { 10, 2, { TC, MR, BC }, 0xaa5500 },
/* 10 */ { 11, 9, { TC, ML, MR }, 0xaa5500 },
/* 11 */ { 2, 10, { TC, ML, BC }, 0xaa5500 },
/* 12 */ { 13, 4, { TC, BC, BR }, 0xaa00aa },
/* 13 */ { 14, 12, { TR, ML, MR }, 0xaa00aa },
/* 14 */ { 4, 13, { TL, TC, BC }, 0xaa00aa },
/* 15 */ { 16, 5, { TR, TC, BC }, 0xffa500 },
/* 16 */ { 17, 15, { TL, MR, ML }, 0xffa500 },
/* 17 */ { 5, 16, { TC, BC, BL }, 0xffa500 },
/* 18 */ { 6, 6, { TC, BC, 2 * B_COLS }, 0xaa0000 } /* sticks out */
};
/*
* Return true iff the given shape fits in the given position,
* taking the current board into account.
*/
errno_t fits_in(const struct shape *shape, int pos)
{
const 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)
{
const int *o = shape->off;
board[pos] = onoff ? shape->color : 0x000000;
board[pos + *o++] = onoff ? shape->color : 0x000000;
board[pos + *o++] = onoff ? shape->color : 0x000000;
board[pos + *o] = onoff ? shape->color : 0x000000;
}
/** @}
*/