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+/* $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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. 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 <sys/cdefs.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 */
+
+struct shape shapes[] = {
+ /* 0*/ 7, TL, TC, MR,
+ /* 1*/ 8, TC, TR, ML,
+ /* 2*/ 9, ML, MR, BC,
+ /* 3*/ 3, TL, TC, ML,
+ /* 4*/ 12, ML, BL, MR,
+ /* 5*/ 15, ML, BR, MR,
+ /* 6*/ 18, ML, MR, /* sticks out */ 2,
+ /* 7*/ 0, TC, ML, BL,
+ /* 8*/ 1, TC, MR, BR,
+ /* 9*/ 10, TC, MR, BC,
+ /*10*/ 11, TC, ML, MR,
+ /*11*/ 2, TC, ML, BC,
+ /*12*/ 13, TC, BC, BR,
+ /*13*/ 14, TR, ML, MR,
+ /*14*/ 4, TL, TC, BC,
+ /*15*/ 16, TR, TC, BC,
+ /*16*/ 17, TL, MR, ML,
+ /*17*/ 5, TC, BC, BL,
+ /*18*/ 6, TC, BC, /* sticks out */ 2*B_COLS,
+};
+
+/*
+ * Return true iff the given shape fits in the given position,
+ * taking the current board into account.
+ */
+int
+fits_in(shape, pos)
+ struct shape *shape;
+ register int pos;
+{
+ register 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(shape, pos, onoff)
+ struct shape *shape;
+ register int pos, onoff;
+{
+ register int *o = shape->off;
+
+ board[pos] = onoff;
+ board[pos + *o++] = onoff;
+ board[pos + *o++] = onoff;
+ board[pos + *o] = onoff;
+}