forked from KolibriOS/kolibrios
99 lines
2.2 KiB
C++
Executable File
99 lines
2.2 KiB
C++
Executable File
// Emacs style mode select -*- C++ -*-
|
|
//-----------------------------------------------------------------------------
|
|
//
|
|
// $Id:$
|
|
//
|
|
// 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.
|
|
//
|
|
// 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.
|
|
// Guess what, serves as cosine, too.
|
|
// Remarkable thing is, how to use BAMs with this?
|
|
//
|
|
// int tantoangle[2049] - ArcTan LUT,
|
|
// maps tan(angle) to angle fast. Gotta search.
|
|
//
|
|
//-----------------------------------------------------------------------------
|
|
|
|
|
|
#ifndef __TABLES__
|
|
#define __TABLES__
|
|
|
|
|
|
|
|
#ifndef PI
|
|
#define PI 3.141592657
|
|
#endif
|
|
|
|
|
|
#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)
|
|
|
|
typedef unsigned angle_t;
|
|
|
|
|
|
// 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
|
|
//-----------------------------------------------------------------------------
|
|
//
|
|
// $Log:$
|
|
//
|
|
//-----------------------------------------------------------------------------
|