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94 lines
2.9 KiB
C
94 lines
2.9 KiB
C
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/* Emacs style mode select -*- C++ -*-
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*-----------------------------------------------------------------------------
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*
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*
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* PrBoom: a Doom port merged with LxDoom and LSDLDoom
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* based on BOOM, a modified and improved DOOM engine
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* Copyright (C) 1999 by
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* id Software, Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman
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* Copyright (C) 1999-2000 by
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* Jess Haas, Nicolas Kalkhof, Colin Phipps, Florian Schulze
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* Copyright 2005, 2006 by
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* Florian Schulze, Colin Phipps, Neil Stevens, Andrey Budko
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*
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* DESCRIPTION:
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* Lookup tables.
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* Do not try to look them up :-).
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* In the order of appearance:
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*
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* int finetangent[4096] - Tangens LUT.
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* Should work with BAM fairly well (12 of 16bit,
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* effectively, by shifting).
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*
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* int finesine[10240] - Sine lookup.
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* Guess what, serves as cosine, too.
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* Remarkable thing is, how to use BAMs with this?
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*
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* int tantoangle[2049] - ArcTan LUT,
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* maps tan(angle) to angle fast. Gotta search.
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*
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*-----------------------------------------------------------------------------*/
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#ifndef __TABLES__
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#define __TABLES__
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#include "m_fixed.h"
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#define FINEANGLES 8192
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#define FINEMASK (FINEANGLES-1)
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// 0x100000000 to 0x2000
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#define ANGLETOFINESHIFT 19
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// Binary Angle Measument, BAM.
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#define ANG45 0x20000000
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#define ANG90 0x40000000
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#define ANG180 0x80000000
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#define ANG270 0xc0000000
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#ifndef M_PI
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#define M_PI 3.14159265358979323846
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#endif
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#define SLOPERANGE 2048
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#define SLOPEBITS 11
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#define DBITS (FRACBITS-SLOPEBITS)
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typedef unsigned angle_t;
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// Load trig tables if needed
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void R_LoadTrigTables(void);
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// Effective size is 10240.
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extern fixed_t finesine[5*FINEANGLES/4];
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// Re-use data, is just PI/2 phase shift.
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static fixed_t *const finecosine = finesine + (FINEANGLES/4);
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// Effective size is 4096.
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extern fixed_t finetangent[FINEANGLES/2];
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// Effective size is 2049;
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// The +1 size is to handle the case when x==y without additional checking.
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extern angle_t tantoangle[SLOPERANGE+1];
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// Utility function, called by R_PointToAngle.
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int SlopeDiv(unsigned num, unsigned den);
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#endif
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