Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

53 lines (42 sloc) 1.771 kb
/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program 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 2
* of the License, or (at your option) any later version.
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#ifndef COMMON_FRAC_H
#define COMMON_FRAC_H
#include "common/scummsys.h"
/**
* The precision of the fractional (fixed point) type we define below.
* Normally you should never have to modify this value.
*/
enum {
FRAC_BITS = 16,
FRAC_LO_MASK = ((1L << FRAC_BITS) - 1),
FRAC_HI_MASK = ((1L << FRAC_BITS) - 1) << FRAC_BITS,
FRAC_ONE = (1L << FRAC_BITS), // 1.0
FRAC_HALF = (1L << (FRAC_BITS-1)) // 0.5
};
/**
* Fixed-point fractions, used by the sound rate converter and other code.
*/
typedef int32 frac_t;
inline frac_t doubleToFrac(double value) { return (frac_t)(value * FRAC_ONE); }
inline double fracToDouble(frac_t value) { return ((double)value) / FRAC_ONE; }
inline frac_t intToFrac(int16 value) { return value << FRAC_BITS; }
inline int16 fracToInt(frac_t value) { return value >> FRAC_BITS; }
#endif
Jump to Line
Something went wrong with that request. Please try again.