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/* This code is part of the tng compression routines.
*
* Written by Daniel Spangberg
* Copyright (c) 2010, 2013, The GROMACS development team.
*
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the Revised BSD License.
*/
#ifndef FIXPOINT_H
#define FIXPOINT_H
#include "compression/my64bit.h"
/* There are at least 32 bits available in a long. */
typedef unsigned long fix_t;
/* Positive double to 32 bit fixed point value */
fix_t Ptngc_ud_to_fix_t(double d,double max);
/* double to signed 32 bit fixed point value */
fix_t Ptngc_d_to_fix_t(double d,double max);
/* 32 bit fixed point value to positive double */
double Ptngc_fix_t_to_ud(fix_t f, double max);
/* signed 32 bit fixed point value to double */
double Ptngc_fix_t_to_d(fix_t f, double max);
/* Convert a floating point variable to two 32 bit integers with range
-2.1e9 to 2.1e9 and precision to somewhere around 1e-9. */
void Ptngc_d_to_i32x2(double d, fix_t *hi, fix_t *lo);
/* Convert two 32 bit integers to a floating point variable
-2.1e9 to 2.1e9 and precision to somewhere around 1e-9. */
double Ptngc_i32x2_to_d(fix_t hi, fix_t lo);
#endif
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