diff options
Diffstat (limited to 'apps/plugins/doom/tables.h')
-rw-r--r-- | apps/plugins/doom/tables.h | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/apps/plugins/doom/tables.h b/apps/plugins/doom/tables.h new file mode 100644 index 0000000000..f9ec4381ee --- /dev/null +++ b/apps/plugins/doom/tables.h | |||
@@ -0,0 +1,103 @@ | |||
1 | /* Emacs style mode select -*- C++ -*- | ||
2 | *----------------------------------------------------------------------------- | ||
3 | * | ||
4 | * | ||
5 | * PrBoom a Doom port merged with LxDoom and LSDLDoom | ||
6 | * based on BOOM, a modified and improved DOOM engine | ||
7 | * Copyright (C) 1999 by | ||
8 | * id Software, Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman | ||
9 | * Copyright (C) 1999-2000 by | ||
10 | * Jess Haas, Nicolas Kalkhof, Colin Phipps, Florian Schulze | ||
11 | * | ||
12 | * This program is free software; you can redistribute it and/or | ||
13 | * modify it under the terms of the GNU General Public License | ||
14 | * as published by the Free Software Foundation; either version 2 | ||
15 | * of the License, or (at your option) any later version. | ||
16 | * | ||
17 | * This program is distributed in the hope that it will be useful, | ||
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
20 | * GNU General Public License for more details. | ||
21 | * | ||
22 | * You should have received a copy of the GNU General Public License | ||
23 | * along with this program; if not, write to the Free Software | ||
24 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | ||
25 | * 02111-1307, USA. | ||
26 | * | ||
27 | * DESCRIPTION: | ||
28 | * Lookup tables. | ||
29 | * Do not try to look them up :-). | ||
30 | * In the order of appearance: | ||
31 | * | ||
32 | * int finetangent[4096] - Tangens LUT. | ||
33 | * Should work with BAM fairly well (12 of 16bit, | ||
34 | * effectively, by shifting). | ||
35 | * | ||
36 | * int finesine[10240] - Sine lookup. | ||
37 | * Guess what, serves as cosine, too. | ||
38 | * Remarkable thing is, how to use BAMs with this? | ||
39 | * | ||
40 | * int tantoangle[2049] - ArcTan LUT, | ||
41 | * maps tan(angle) to angle fast. Gotta search. | ||
42 | * | ||
43 | *-----------------------------------------------------------------------------*/ | ||
44 | |||
45 | #ifndef __TABLES__ | ||
46 | #define __TABLES__ | ||
47 | |||
48 | #include "m_fixed.h" | ||
49 | #include "rockmacros.h" | ||
50 | |||
51 | #define FINEANGLES 8192 | ||
52 | #define FINEMASK (FINEANGLES-1) | ||
53 | |||
54 | // 0x100000000 to 0x2000 | ||
55 | #define ANGLETOFINESHIFT 19 | ||
56 | |||
57 | #ifndef ALL_IN_ONE | ||
58 | |||
59 | // TABLES_AS_LUMPS causes the tables to be loaded from a wad lump, and the normal | ||
60 | // data to be stored as a predefined lump. | ||
61 | // Only really useful for dumping the trig tables or with NO_PREDEFINED_LUMPS | ||
62 | #define TABLES_AS_LUMPS | ||
63 | #endif | ||
64 | |||
65 | // Binary Angle Measument, BAM. | ||
66 | #define ANG45 0x20000000 | ||
67 | #define ANG90 0x40000000 | ||
68 | #define ANG180 0x80000000 | ||
69 | #define ANG270 0xc0000000 | ||
70 | |||
71 | #define SLOPERANGE 2048 | ||
72 | #define SLOPEBITS 11 | ||
73 | #define DBITS (FRACBITS-SLOPEBITS) | ||
74 | |||
75 | typedef unsigned angle_t; | ||
76 | |||
77 | // Load trig tables if needed | ||
78 | #ifdef TABLES_AS_LUMPS | ||
79 | void R_LoadTrigTables(void); | ||
80 | #define TRIG_CONST | ||
81 | #else | ||
82 | #define TRIG_CONST const | ||
83 | #endif | ||
84 | |||
85 | // Effective size is 10240. | ||
86 | extern TRIG_CONST fixed_t *finesine; | ||
87 | |||
88 | // Re-use data, is just PI/2 phase shift. | ||
89 | extern TRIG_CONST fixed_t *finecosine; | ||
90 | |||
91 | // Effective size is 4096. | ||
92 | extern TRIG_CONST fixed_t *finetangent; | ||
93 | |||
94 | // Effective size is 2049; | ||
95 | // The +1 size is to handle the case when x==y without additional checking. | ||
96 | |||
97 | extern TRIG_CONST angle_t *tantoangle; | ||
98 | |||
99 | // Utility function, called by R_PointToAngle. | ||
100 | int SlopeDiv(unsigned num, unsigned den); | ||
101 | |||
102 | #undef TRIG_CONST | ||
103 | #endif | ||