-
Notifications
You must be signed in to change notification settings - Fork 3
/
tables.pas
96 lines (79 loc) · 2.43 KB
/
tables.pas
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
//------------------------------------------------------------------------------
//
// DoomXS - A basic Windows source port of Doom
// based on original Linux Doom as published by "id Software"
// Copyright (C) 1993-1996 by id Software, Inc.
// Copyright (C) 2021-2022 by Jim Valavanis
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, inc., 59 Temple Place - Suite 330, Boston, MA
// 02111-1307, USA.
//
//------------------------------------------------------------------------------
// Site: https://sourceforge.net/projects/doomxs/
//------------------------------------------------------------------------------
unit tables;
interface
uses
m_fixed;
const
d_PI = 3.141592657;
const
FINEANGLES = 8192;
FINEMASK = FINEANGLES - 1;
// 0x100000000 to 0x2000
ANGLETOFINESHIFT = 19;
type
angle_t = LongWord;
const
ANG45 = $20000000;
ANG90 = $40000000;
ANG180 = $80000000;
ANG270 = $c0000000;
SLOPERANGE = 2048;
SLOPEBITS = 11;
DBITS = FRACBITS - SLOPEBITS;
var
// Effective size is 10240.
finesine: array[0..((5 * FINEANGLES) div 4) - 1] of fixed_t;
// Re-use data, is just PI/2 pahse shift.
finecosine: Pfixed_tArray;
// Effective size is 4096.
finetangent : array[0..(FINEANGLES div 2) - 1] of fixed_t;
// Effective size is 2049;
// The +1 size is to handle the case when x==y
// without additional checking.
tantoangle: array[0..(SLOPERANGE + 1) - 1] of angle_t;
// Utility function,
// called by R_PointToAngle.
function SlopeDiv(const num: integer; const den: integer): integer;
implementation
uses
d_delphi;
function SlopeDiv(const num: integer; const den: integer): integer;
var
ans: LongWord;
begin
if den < 512 then
Result := SLOPERANGE
else
begin
ans := _SHL(num, 3) div _SHR(den, 8);
if ans < SLOPERANGE then
Result := ans
else
Result := SLOPERANGE;
end;
end;
end.