/*****************************************************************************/
/* D2K: A Doom Source Port for the 21st Century                              */
/*                                                                           */
/* Copyright (C) 2014: See COPYRIGHT file                                    */
/*                                                                           */
/* This file is part of D2K.                                                 */
/*                                                                           */
/* D2K 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, either version 2 of the License, or (at your option) any      */
/* later version.                                                            */
/*                                                                           */
/* D2K is distributed in the hope that it will be useful, but WITHOUT ANY    */
/* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS */
/* FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more    */
/* details.                                                                  */
/*                                                                           */
/* You should have received a copy of the GNU General Public License along   */
/* with D2K.  If not, see <http://www.gnu.org/licenses/>.                    */
/*                                                                           */
/*****************************************************************************/


#ifndef TABLES_H__
#define TABLES_H__

#include "m_fixed.h"

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

// 0x100000000 to 0x2000
#define ANGLETOFINESHIFT        19

// Binary Angle Measument, BAM.
#define ANG45   0x20000000
#define ANG90   0x40000000
#define ANG180  0x80000000
#define ANG270  0xc0000000
#define ANG1      (ANG45/45)
#define ANGLE_MAX 0xffffffff
#ifndef M_PI
#define M_PI    3.14159265358979323846
#endif

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

typedef unsigned angle_t;

// Load trig tables if needed
void R_LoadTrigTables(void);

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

// Re-use data, is just PI/2 phase shift.
static fixed_t *const finecosine = finesine + (FINEANGLES/4);

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

// 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

/* vi: set et ts=2 sw=2: */

