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author | Simon Howard | 2005-07-23 16:19:41 +0000 |
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committer | Simon Howard | 2005-07-23 16:19:41 +0000 |
commit | 66a2cc66d7504c9b64e1c461e62ad2a9d964fa95 (patch) | |
tree | 1e34ee102280a912989ec3084427850372348ebd /src/tables.h | |
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Initial revision
Subversion-branch: /trunk/chocolate-doom
Subversion-revision: 4
Diffstat (limited to 'src/tables.h')
-rw-r--r-- | src/tables.h | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/src/tables.h b/src/tables.h new file mode 100644 index 00000000..8aa07e2a --- /dev/null +++ b/src/tables.h @@ -0,0 +1,103 @@ +// Emacs style mode select -*- C++ -*- +//----------------------------------------------------------------------------- +// +// $Id: tables.h 4 2005-07-23 16:19:41Z fraggle $ +// +// 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__ + + + +#ifdef LINUX +#include <math.h> +#else +#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 +//----------------------------------------------------------------------------- +// +// $Log$ +// Revision 1.1 2005/07/23 16:20:27 fraggle +// Initial revision +// +// +//----------------------------------------------------------------------------- |