/* $Id: tables.h 2646 2006-01-21 13:33:49Z danij $
 *
 * 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.
 */

/*
 * Lookup tables.
 */

#ifndef __TABLES__
#define __TABLES__

#include "doomsday.h"

#define PI              3.141592657

//#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)

// 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