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78 lines
1.7 KiB
78 lines
1.7 KiB
11 months ago
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#include <stdio.h>
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#if defined(__OS2__) || defined(__WINDOWS__) || defined(WIN32) || defined(WIN64) || defined(_MSC_VER)
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#define WINDOWS
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#include <windows.h>
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#else
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#ifdef __APPLE__
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#define OSX
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#include <mach/mach.h>
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#include <mach/mach_time.h>
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#else
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#define LINUX
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#include <sys/time.h>
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#endif
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#endif
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#ifdef HAVE_STDINT_H
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#include <stdint.h>
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#elif HAVE_INTTYPES_H
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#include <inttypes.h>
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#endif
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#include "trax/client.hpp"
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#define TIMER_NSEC_PER_SEC 1000000000ULL
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#define TIMER_USEC_PER_SEC 1000000ULL
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#define TIMER_NSEC_PER_USEC 1000ULL
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namespace trax {
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static double freq = 0;
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void timer_init() {
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if (freq != 0) {
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// Already initialized
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return;
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}
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#if defined(WINDOWS)
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LARGE_INTEGER tmp;
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QueryPerformanceFrequency (&tmp);
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freq = tmp.QuadPart;
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#elif defined(OSX)
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// Convert Mach Absolute Time Units to seconds, use double to avoid overflow.
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// See more on https://developer.apple.com/library/content/qa/qa1398/_index.html
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mach_timebase_info_data_t timebase_info;
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mach_timebase_info(&timebase_info);
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freq = TIMER_NSEC_PER_SEC * timebase_info.denom / (double) timebase_info.numer;
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#else
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freq = TIMER_USEC_PER_SEC;
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#endif
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}
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timer_state timer_clock() {
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#if defined(WINDOWS)
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LARGE_INTEGER tmp;
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QueryPerformanceCounter (&tmp);
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return tmp.QuadPart;
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#elif defined(OSX)
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return mach_absolute_time();
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#else
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struct timespec tv;
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clock_gettime(CLOCK_MONOTONIC_RAW, &tv);
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return ((timer_state) tv.tv_sec * TIMER_USEC_PER_SEC) + (tv.tv_nsec / TIMER_NSEC_PER_USEC);
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#endif
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}
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double timer_elapsed(timer_state start) {
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timer_state delta, stop;
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stop = timer_clock();
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delta = stop - start;
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return (double) delta / freq;
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}
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}
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