/* Emacs style mode select   -*- C++ -*- */
/*-----------------------------------------------------------------------------*/

/* $Id:$*/

/* 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.*/

/* $Log:$*/

/* DESCRIPTION:*/
/*	Fixed point implementation.*/

/*-----------------------------------------------------------------------------*/


static const char
rcsid[] = "$Id: m_bbox.c,v 1.1 1997/02/03 22:45:10 b1 Exp $";

#include "stdlib.h"

#include "doomtype.h"
#include "i_system.h"

#ifdef __GNUG__
#pragma implementation "m_fixed.h"
#endif
#include "m_fixed.h"




#if (!defined(__riscos__) || (FRACBITS != 16))
/* Fixme. __USE_C_FIXED__ or something.*/

fixed_t
FixedMul
( fixed_t	a,
  fixed_t	b )
{
    return ((long long) a * (long long) b) >> FRACBITS;
}




/* FixedDiv, C version.*/


fixed_t
FixedDiv
( fixed_t	a,
  fixed_t	b )
{
    if ( (abs(a)>>14) >= abs(b))
	return (a^b)<0 ? MININT : MAXINT;
    return FixedDiv2 (a,b);
}



fixed_t
FixedDiv2
( fixed_t	a,
  fixed_t	b )
{
#if 0
    long long c;
    c = (((long long)a)<<FRACBITS) / ((long long)b);
    return (fixed_t) c;
#else

    double c;

    c = ((double)a) / ((double)b) * FRACUNIT;

    if (c >= 2147483648.0 || c < -2147483648.0)
	I_Error("FixedDiv: divide by zero");
    return (fixed_t) c;
#endif
}

#endif
