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Diffstat (limited to 'graphics/asymptote/seconds.h')
-rw-r--r-- | graphics/asymptote/seconds.h | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/graphics/asymptote/seconds.h b/graphics/asymptote/seconds.h new file mode 100644 index 0000000000..37f8e32cdc --- /dev/null +++ b/graphics/asymptote/seconds.h @@ -0,0 +1,100 @@ +#ifndef __seconds_h__ +#define __seconds_h__ 1 + +#ifdef _WIN32 +#include <Winsock2.h> + +#include <time.h> +#include <windows.h> +#include <iostream> + +#if defined(_MSC_VER) || defined(_MSC_EXTENSIONS) + #define DELTA_EPOCH_IN_MICROSECS 11644473600000000Ui64 +#else + #define DELTA_EPOCH_IN_MICROSECS 11644473600000000ULL +#endif + +struct timezone +{ + int tz_minuteswest; /* minutes W of Greenwich */ + int tz_dsttime; /* type of dst correction */ +}; + +// Definition of a gettimeofday function + +inline int gettimeofday(struct timeval *tv, struct timezone *tz) +{ +// Define a structure to receive the current Windows filetime + FILETIME ft; + +// Initialize the present time to 0 and the timezone to UTC + unsigned __int64 tmpres = 0; + static int tzflag = 0; + + if (NULL != tv) + { + GetSystemTimeAsFileTime(&ft); + +// The GetSystemTimeAsFileTime returns the number of 100 nanosecond +// intervals since Jan 1, 1601 in a structure. Copy the high bits to +// the 64 bit tmpres, shift it left by 32 then or in the low 32 bits. + tmpres |= ft.dwHighDateTime; + tmpres <<= 32; + tmpres |= ft.dwLowDateTime; + +// Convert to microseconds by dividing by 10 + tmpres /= 10; + +// The Unix epoch starts on Jan 1 1970. Need to subtract the difference +// in seconds from Jan 1 1601. + tmpres -= DELTA_EPOCH_IN_MICROSECS; + +// Finally change microseconds to seconds and place in the seconds value. +// The modulus picks up the microseconds. + tv->tv_sec = (long)(tmpres / 1000000UL); + tv->tv_usec = (long)(tmpres % 1000000UL); + } + + if (NULL != tz) + { + if (!tzflag) + { + _tzset(); + tzflag++; + } + +// Adjust for the timezone west of Greenwich + tz->tz_minuteswest = _timezone / 60; + tz->tz_dsttime = _daylight; + } + + return 0; +} + +#else + +#include <sys/time.h> + +#endif + +namespace utils { + +inline double totalseconds() +{ + timeval tv; + gettimeofday(&tv,NULL); + return tv.tv_sec+tv.tv_usec/1000000.0; +} + +inline double seconds() +{ + static double lastseconds=totalseconds(); + double t=totalseconds(); + double seconds=t-lastseconds; + lastseconds=t; + return seconds; +} + +} + +#endif |