mirror of
https://github.com/ZDoom/gzdoom.git
synced 2024-12-01 00:12:27 +00:00
118 lines
3 KiB
C++
118 lines
3 KiB
C++
// 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_H__
|
|
#define __TABLES_H__
|
|
|
|
#include <math.h>
|
|
#include "basictypes.h"
|
|
|
|
#ifndef PI
|
|
#define PI 3.14159265358979323846 // matches value in gcc v2 math.h
|
|
#endif
|
|
|
|
|
|
#define FINEANGLEBITS 13
|
|
#define FINEANGLES 8192
|
|
#define FINEMASK (FINEANGLES-1)
|
|
|
|
// 0x100000000 to 0x2000
|
|
#define ANGLETOFINESHIFT 19
|
|
|
|
#define BOBTOFINESHIFT (FINEANGLEBITS - 6)
|
|
|
|
// Effective size is 10240.
|
|
extern fixed_t finesine[5*FINEANGLES/4];
|
|
|
|
// Re-use data, is just PI/2 phase shift.
|
|
// [RH] Instead of using a pointer, use some inline code
|
|
// (encapsulated in a struct so that we can still use array accesses).
|
|
struct cosine_inline
|
|
{
|
|
fixed_t operator[] (unsigned int x) const
|
|
{
|
|
return finesine[x+FINEANGLES/4];
|
|
}
|
|
};
|
|
extern cosine_inline 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 ANGLE_45 (0x20000000)
|
|
#define ANGLE_90 (0x40000000)
|
|
#define ANGLE_180 (0x80000000)
|
|
#define ANGLE_270 (0xc0000000)
|
|
#define ANGLE_MAX (0xffffffff)
|
|
#define ANGLE_1 (ANGLE_45/45)
|
|
#define ANGLE_60 (ANGLE_180/3)
|
|
|
|
|
|
#define SLOPERANGE 2048
|
|
#define SLOPEBITS 11
|
|
#define DBITS (FRACBITS-SLOPEBITS)
|
|
|
|
typedef uint32 angle_t;
|
|
|
|
// Avoid "ambiguous call to overloaded function" errors
|
|
// Only to be used when you have subtracted two angles.
|
|
#ifndef __GNUC__
|
|
inline angle_t abs (angle_t ang)
|
|
{
|
|
return (angle_t)abs((SDWORD)ang);
|
|
}
|
|
#endif
|
|
|
|
// Effective size is 2049;
|
|
// The +1 size is to handle the case when x==y
|
|
// without additional checking.
|
|
extern angle_t tantoangle[SLOPERANGE+1];
|
|
|
|
inline double bam2rad(angle_t ang)
|
|
{
|
|
return double(ang >> 1) * (PI / ANGLE_90);
|
|
}
|
|
inline angle_t rad2bam(double ang)
|
|
{
|
|
return angle_t(ang * (double(1<<30) / PI)) << 1;
|
|
}
|
|
|
|
#endif // __TABLES_H__
|