/* 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  const fixed_t	finesine[5*FINEANGLES/4];

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


/* Effective size is 4096.*/
extern const 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 const angle_t	tantoangle[SLOPERANGE+1];


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


#endif
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/* $Log:$*/

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