ResidualVM logo ResidualVM website - Forums - Contact us BuildBot - Doxygen - Wiki curved edge

frac.h

Go to the documentation of this file.
00001 /* ScummVM - Graphic Adventure Engine
00002  *
00003  * ScummVM is the legal property of its developers, whose names
00004  * are too numerous to list here. Please refer to the COPYRIGHT
00005  * file distributed with this source distribution.
00006  *
00007  * This program is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU General Public License
00009  * as published by the Free Software Foundation; either version 2
00010  * of the License, or (at your option) any later version.
00011  *
00012  * This program is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License
00018  * along with this program; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
00020  *
00021  */
00022 
00023 #ifndef COMMON_FRAC_H
00024 #define COMMON_FRAC_H
00025 
00026 #include "common/scummsys.h"
00027 
00032 enum {
00033     FRAC_BITS = 16,
00034     FRAC_LO_MASK = ((1L << FRAC_BITS) - 1),
00035     FRAC_HI_MASK = ((1L << FRAC_BITS) - 1) << FRAC_BITS,
00036 
00037     FRAC_ONE = (1L << FRAC_BITS),       // 1.0
00038     FRAC_HALF = (1L << (FRAC_BITS-1))   // 0.5
00039 };
00040 
00044 typedef int32 frac_t;
00045 
00046 inline frac_t doubleToFrac(double value) { return (frac_t)(value * FRAC_ONE); }
00047 inline double fracToDouble(frac_t value) { return ((double)value) / FRAC_ONE; }
00048 
00049 inline frac_t intToFrac(int16 value) { return value * (1 << FRAC_BITS); }
00050 inline int16 fracToInt(frac_t value) { return value / (1 << FRAC_BITS); }
00051 
00052 #endif


Generated on Sat May 25 2019 05:00:45 for ResidualVM by doxygen 1.7.1
curved edge   curved edge