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94 lines
2.3 KiB
C++
94 lines
2.3 KiB
C++
// Emacs style mode select -*- C++ -*-
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//-----------------------------------------------------------------------------
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//
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// Copyright(C) 1993-1996 Id Software, Inc.
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// Copyright(C) 2005 Simon Howard
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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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// Effective size is 10240.
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extern const fixed_t finesine[5*FINEANGLES/4];
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// Re-use data, is just PI/2 pahse shift.
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extern const fixed_t *finecosine;
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// Effective size is 4096.
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extern const fixed_t finetangent[FINEANGLES/2];
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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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#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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// Effective size is 2049;
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// The +1 size is to handle the case when x==y
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// without additional checking.
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extern const angle_t tantoangle[SLOPERANGE+1];
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// Utility function,
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// called by R_PointToAngle.
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int
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SlopeDiv
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( unsigned num,
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unsigned den);
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#endif
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