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// .oOO8OOOOOOOOOOOOOOOCc
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// .oCOOOOOCc. http://remood.org/
// ----------------------------------------------------------------------------
// Copyright (C) 1993-1996 by id Software, Inc.
// Copyright (C) 1998-2000 by DooM Legacy Team.
// Copyright (C) 2008-2013 GhostlyDeath <ghostlydeath@remood.org>
// <ghostlydeath@gmail.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; either version 3
// of the License, or (at your option) any later version.
//
// This program 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.
// ----------------------------------------------------------------------------
// 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.
// int tantoangle[2049] - ArcTan LUT,
// maps tan(angle) to angle fast. Gotta search.
#ifndef __TABLES__
#define __TABLES__
#include "doomtype.h"
#define FINEANGLES 8192
#define FINEMASK (FINEANGLES-1)
#define ANGLETOFINESHIFT 19 // 0x100000000 to 0x2000
// Effective size is 10240.
extern fixed_t finesine[5 * FINEANGLES / 4];
// Re-use data, is just PI/2 phase shift.
extern fixed_t* finecosine;
// Effective size is 4096.
extern fixed_t finetangent[FINEANGLES / 2];
// to get a global angle from cartesian coordinates, the coordinates are
// flipped until they are in the first octant of the coordinate system, then
// the y (<=x) is scaled and divided by x to get a tangent (slope) value
// which is looked up in the tantoangle[] table.
#define SLOPERANGE 2048
#define SLOPEBITS 11
#define DBITS (FRACBITS-SLOPEBITS)
// 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.
angle_t SlopeDiv(angle_t num, angle_t den);
fixed_t TBL_BAMToDeg(const angle_t a_Angle);
extern const int16_t c_AngLUT[8192];
#endif