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Annotation of doom/tables.h, revision 1.1

1.1     ! root        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: #ifdef LINUX
        !            42: #include <math.h>
        !            43: #else
        !            44: #define PI                             3.141592657
        !            45: #endif
        !            46: 
        !            47: 
        !            48: #include "m_fixed.h"
        !            49:        
        !            50: #define FINEANGLES             8192
        !            51: #define FINEMASK               (FINEANGLES-1)
        !            52: 
        !            53: 
        !            54: // 0x100000000 to 0x2000
        !            55: #define ANGLETOFINESHIFT       19              
        !            56: 
        !            57: // Effective size is 10240.
        !            58: extern  fixed_t                finesine[5*FINEANGLES/4];
        !            59: 
        !            60: // Re-use data, is just PI/2 pahse shift.
        !            61: extern  fixed_t*       finecosine;
        !            62: 
        !            63: 
        !            64: // Effective size is 4096.
        !            65: extern fixed_t         finetangent[FINEANGLES/2];
        !            66: 
        !            67: // Binary Angle Measument, BAM.
        !            68: #define ANG45                  0x20000000
        !            69: #define ANG90                  0x40000000
        !            70: #define ANG180         0x80000000
        !            71: #define ANG270         0xc0000000
        !            72: 
        !            73: 
        !            74: #define SLOPERANGE             2048
        !            75: #define SLOPEBITS              11
        !            76: #define DBITS                  (FRACBITS-SLOPEBITS)
        !            77: 
        !            78: typedef unsigned angle_t;
        !            79: 
        !            80: 
        !            81: // Effective size is 2049;
        !            82: // The +1 size is to handle the case when x==y
        !            83: //  without additional checking.
        !            84: extern angle_t         tantoangle[SLOPERANGE+1];
        !            85: 
        !            86: 
        !            87: // Utility function,
        !            88: //  called by R_PointToAngle.
        !            89: int
        !            90: SlopeDiv
        !            91: ( unsigned     num,
        !            92:   unsigned     den);
        !            93: 
        !            94: 
        !            95: #endif
        !            96: //-----------------------------------------------------------------------------
        !            97: //
        !            98: // $Log:$
        !            99: //
        !           100: //-----------------------------------------------------------------------------

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