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/*
* Interface provided by the xtbot skeleton to the decision module
*
* Copyright (C) 1996 Roger Espel Llima <roger.espel.llima@pobox.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation. See the file COPYING for details.
*
*/
/* These are the external variables and functions that the decision module
* can use:
*/
/* piece shapes, as defined in xtbot.c; see the functions put() and fits()
* for the encoding... the evaluation routines shouldn't need to use the
* shapes directly anyway.
*/
extern int shape[7][4][8];
/* for each of the pieces, how many of their rotations are actually different.
* used to check all combinations w/o checking each position more than once
* for pieces like the square.
*/
extern int rotations[7];
/* the tetris pit; positions are numbered from 0,0 (top left) to
* 19,9 (bottom right). note that the row number is the FIRST index,
* not the second.
*/
extern int pit[20][10];
/* exits with an error message; use for cases like malloc() failing
* or some impossible condition being reached
*/
extern void fatal(char *);
/* a pretty good random number generator.
*/
extern unsigned int my_rand(void);
/* check if a piece fits at a given position in the pit; the arguments
* are the piece number, the rotation number (0 to 3), the column and
* the row. note that this will return true even if the piece sticks out
* at the top of the screen, which is valid for pieces that are still falling
* if they get rotated while they're at the top, but not for pieces that
* are done falling.
*/
extern int fits (int piece, int rot, int x, int y);
/* check if a piece sticks out at the top of the screen.
*/
extern int sticksout(int piece, int rot, int x, int y);
/* put a piece at a given position on the screen. 'type' usually
* the same as 'piece', each type is given a different color on the
* screen. the special value EMPTY means that the position is empty,
* and the special value CURRENT indicates the piece that is currently
* being tested at some position for evaluation (and that is therefore
* not going to be drawn with that type.
*/
extern void put(int piece, int rot, int x, int y, int type);
#define remove(p, r, x, y) put(p, r, x, y, EMPTY)
#define EMPTY 7
#define GRAY 8
#define CURRENT 255
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