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// Copyright (C) 2002-2012 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h
#ifndef __IRR_OS_H_INCLUDED__
#define __IRR_OS_H_INCLUDED__
#include "IrrCompileConfig.h" // for endian check
#include "irrTypes.h"
#include "irrString.h"
#include "path.h"
#include "ILogger.h"
#include "ITimer.h"
namespace irr
{
namespace os
{
class Byteswap
{
public:
static u16 byteswap(u16 num);
static s16 byteswap(s16 num);
static u32 byteswap(u32 num);
static s32 byteswap(s32 num);
static f32 byteswap(f32 num);
// prevent accidental swapping of chars
static u8 byteswap(u8 num);
static c8 byteswap(c8 num);
};
class Printer
{
public:
// prints out a string to the console out stdout or debug log or whatever
static void print(const c8* message);
static void log(const c8* message, ELOG_LEVEL ll = ELL_INFORMATION);
static void log(const wchar_t* message, ELOG_LEVEL ll = ELL_INFORMATION);
static void log(const c8* message, const c8* hint, ELOG_LEVEL ll = ELL_INFORMATION);
static void log(const c8* message, const io::path& hint, ELOG_LEVEL ll = ELL_INFORMATION);
static ILogger* Logger;
};
// mixed linear congruential generator (MLCG)
// numbers chosen according to L'Ecuyer, Commun. ACM 31 (1988) 742
// period is somewhere around m-1
class Randomizer
{
public:
//! resets the randomizer
static void reset(s32 value=0x0f0f0f0f);
//! generates a pseudo random number in the range 0..randMax()
static s32 rand();
//! generates a pseudo random number in the range 0..1
static f32 frand();
//! get maxmimum number generated by rand()
static s32 randMax();
private:
static s32 seed;
static const s32 m = 2147483399; // a non-Mersenne prime
static const s32 a = 40692; // another spectral success story
static const s32 q = m/a;
static const s32 r = m%a; // again less than q
static const s32 rMax = m-1;
};
class Timer
{
public:
//! returns the current time in milliseconds
static u32 getTime();
//! get current time and date in calendar form
static ITimer::RealTimeDate getRealTimeAndDate();
//! initializes the real timer
static void initTimer(bool usePerformanceTimer=true);
//! sets the current virtual (game) time
static void setTime(u32 time);
//! stops the virtual (game) timer
static void stopTimer();
//! starts the game timer
static void startTimer();
//! sets the speed of the virtual timer
static void setSpeed(f32 speed);
//! gets the speed of the virtual timer
static f32 getSpeed();
//! returns if the timer currently is stopped
static bool isStopped();
//! makes the virtual timer update the time value based on the real time
static void tick();
//! returns the current real time in milliseconds
static u32 getRealTime();
private:
static void initVirtualTimer();
static f32 VirtualTimerSpeed;
static s32 VirtualTimerStopCounter;
static u32 StartRealTime;
static u32 LastVirtualTime;
static u32 StaticTime;
};
} // end namespace os
} // end namespace irr
#endif
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