Go to most recent revision | Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 298 | serge | 1 | // Emacs style mode select -*- C++ -*- |
| 2 | //----------------------------------------------------------------------------- |
||
| 3 | // |
||
| 4 | // $Id:$ |
||
| 5 | // |
||
| 6 | // Copyright (C) 1993-1996 by id Software, Inc. |
||
| 7 | // |
||
| 8 | // This source is available for distribution and/or modification |
||
| 9 | // only under the terms of the DOOM Source Code License as |
||
| 10 | // published by id Software. All rights reserved. |
||
| 11 | // |
||
| 12 | // The source is distributed in the hope that it will be useful, |
||
| 13 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
||
| 14 | // FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License |
||
| 15 | // for more details. |
||
| 16 | // |
||
| 17 | // DESCRIPTION: |
||
| 18 | // Lookup tables. |
||
| 19 | // Do not try to look them up :-). |
||
| 20 | // In the order of appearance: |
||
| 21 | // |
||
| 22 | // int finetangent[4096] - Tangens LUT. |
||
| 23 | // Should work with BAM fairly well (12 of 16bit, |
||
| 24 | // effectively, by shifting). |
||
| 25 | // |
||
| 26 | // int finesine[10240] - Sine lookup. |
||
| 27 | // Guess what, serves as cosine, too. |
||
| 28 | // Remarkable thing is, how to use BAMs with this? |
||
| 29 | // |
||
| 30 | // int tantoangle[2049] - ArcTan LUT, |
||
| 31 | // maps tan(angle) to angle fast. Gotta search. |
||
| 32 | // |
||
| 33 | //----------------------------------------------------------------------------- |
||
| 34 | |||
| 35 | |||
| 36 | #ifndef __TABLES__ |
||
| 37 | #define __TABLES__ |
||
| 38 | |||
| 39 | |||
| 40 | |||
| 41 | #ifndef PI |
||
| 42 | #define PI 3.141592657 |
||
| 43 | #endif |
||
| 44 | |||
| 45 | |||
| 46 | #include "m_fixed.h" |
||
| 47 | |||
| 48 | #define FINEANGLES 8192 |
||
| 49 | #define FINEMASK (FINEANGLES-1) |
||
| 50 | |||
| 51 | |||
| 52 | // 0x100000000 to 0x2000 |
||
| 53 | #define ANGLETOFINESHIFT 19 |
||
| 54 | |||
| 55 | // Effective size is 10240. |
||
| 56 | extern fixed_t finesine[5*FINEANGLES/4]; |
||
| 57 | |||
| 58 | // Re-use data, is just PI/2 pahse shift. |
||
| 59 | extern fixed_t* finecosine; |
||
| 60 | |||
| 61 | |||
| 62 | // Effective size is 4096. |
||
| 63 | extern fixed_t finetangent[FINEANGLES/2]; |
||
| 64 | |||
| 65 | // Binary Angle Measument, BAM. |
||
| 66 | #define ANG45 0x20000000 |
||
| 67 | #define ANG90 0x40000000 |
||
| 68 | #define ANG180 0x80000000 |
||
| 69 | #define ANG270 0xc0000000 |
||
| 70 | |||
| 71 | |||
| 72 | #define SLOPERANGE 2048 |
||
| 73 | #define SLOPEBITS 11 |
||
| 74 | #define DBITS (FRACBITS-SLOPEBITS) |
||
| 75 | |||
| 76 | typedef unsigned angle_t; |
||
| 77 | |||
| 78 | |||
| 79 | // Effective size is 2049; |
||
| 80 | // The +1 size is to handle the case when x==y |
||
| 81 | // without additional checking. |
||
| 82 | extern angle_t tantoangle[SLOPERANGE+1]; |
||
| 83 | |||
| 84 | |||
| 85 | // Utility function, |
||
| 86 | // called by R_PointToAngle. |
||
| 87 | int |
||
| 88 | SlopeDiv |
||
| 89 | ( unsigned num, |
||
| 90 | unsigned den); |
||
| 91 | |||
| 92 | |||
| 93 | #endif |
||
| 94 | //----------------------------------------------------------------------------- |
||
| 95 | // |
||
| 96 | // $Log:$ |
||
| 97 | // |
||
| 98 | //----------------------------------------------------------------------------- |