/* Emacs style mode select   -*- C++ -*- */
/*----------------------------------------------------------------------------- */
/* */
/* $Id:$ */
/* */
/* Copyright (C) 1993-1996 by id Software, Inc. */
/* */
/* This source is available for distribution and/or modification */
/* only under the terms of the DOOM Source Code License as */
/* published by id Software. All rights reserved. */
/* */
/* The source is distributed in the hope that it will be useful, */
/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
/* FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License */
/* for more details. */
/* */
/* DESCRIPTION: */
/*	Lookup tables. */
/*	Do not try to look them up :-). */
/*	In the order of appearance: */
/* */
/*	int finetangent[4096]	- Tangens LUT. */
/*	 Should work with BAM fairly well (12 of 16bit, */
/*      effectively, by shifting). */
/* */
/*	int finesine[10240]		- Sine lookup. */
/*	 Guess what, serves as cosine, too. */
/*	 Remarkable thing is, how to use BAMs with this? */
/* */
/*	int tantoangle[2049]	- ArcTan LUT, */
/*	  maps tan(angle) to angle fast. Gotta search. */
/* */
/*----------------------------------------------------------------------------- */


#ifndef __TABLES__
#define __TABLES__



#ifdef LINUX
#include <math.h>
#else
/*#define PI				3.141592657 */
#endif


#include "m_fixed.h"

#define FINEANGLES              8192
#define FINEMASK                (FINEANGLES-1)


/* 0x100000000 to 0x2000 */
#define ANGLETOFINESHIFT        19

/* Effective size is 10240. */
extern fixed_t finesine[5*FINEANGLES/4];

/* Re-use data, is just PI/2 pahse shift. */
extern fixed_t*        finecosine;


/* Effective size is 4096. */
extern fixed_t finetangent[FINEANGLES/2];

/* Binary Angle Measument, BAM. */
#define ANG45                   0x20000000
#define ANG90                   0x40000000
#define ANG180          0x80000000
#define ANG270          0xc0000000


#define SLOPERANGE              2048
#define SLOPEBITS               11
#define DBITS                   (FRACBITS-SLOPEBITS)

typedef unsigned angle_t;


/* Effective size is 2049; */
/* The +1 size is to handle the case when x==y */
/*  without additional checking. */
extern angle_t tantoangle[SLOPERANGE+1];


/* Utility function, */
/*  called by R_PointToAngle. */
int
SlopeDiv
        ( unsigned num,
        unsigned den);


#endif
/*----------------------------------------------------------------------------- */
/* */
/* $Log:$ */
/* */
/*----------------------------------------------------------------------------- */
