DOOM-3-BFG/doomclassic/doom/tables.h

/*
===========================================================================

Doom 3 BFG Edition GPL Source Code
Copyright (C) 1993-2012 id Software LLC, a ZeniMax Media company. 

This file is part of the Doom 3 BFG Edition GPL Source Code ("Doom 3 BFG Edition Source Code").  

Doom 3 BFG Edition Source Code 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 3 of the License, or
(at your option) any later version.

Doom 3 BFG Edition Source Code 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 Doom 3 BFG Edition Source Code.  If not, see <http://www.gnu.org/licenses/>.

In addition, the Doom 3 BFG Edition Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 BFG Edition Source Code.  If not, please request a copy in writing from id Software at the address below.

If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.

===========================================================================
*/

#ifndef __TABLES__
#define __TABLES__



#ifdef LINUX
#include <math.h>
#else
const float PI = 				3.141592657f;
#endif


#include "m_fixed.h"
	
#define FINEANGLES		8192
#define FINEMASK		(FINEANGLES-1)


// 0x100000000 to 0x2000
#define ANGLETOFINESHIFT	19		

// Effective size is 10240.
const extern  fixed_t		finesine[5*FINEANGLES/4];

// Re-use data, is just PI/2 pahse shift.
const extern  fixed_t*	finecosine;


// Effective size is 4096.
const extern fixed_t		finetangent[FINEANGLES/2];

// Binary Angle Measument, BAM.
#define ANG45			0x20000000u
#define ANG90			0x40000000u
#define ANG180		0x80000000u
#define ANG270		0xc0000000u


#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.
const extern angle_t		tantoangle[SLOPERANGE+1];


// Utility function,
//  called by R_PointToAngle.
int
SlopeDiv
( unsigned	num,
  unsigned	den);


#endif