/* 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. * * $URL$ * $Id$ * */ #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

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