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#include "timer.h"
#include <stdlib.h>
#ifdef _WIN32
static const int64_t microseconds = 1000000;
#endif
static const int64_t nanoseconds = 1000000000;
#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include <Windows.h>
#endif
#ifdef _WIN32
static double seconds_per_count;
#endif
static void timer_initialise() {
#ifdef _WIN32
__int64 counts_per_sec;
QueryPerformanceFrequency((LARGE_INTEGER*)&counts_per_sec);
seconds_per_count = 1.0 / (double)counts_per_sec;
#endif
}
Timer timer_make(void) {
timer_initialise();
Timer timer = {0};
timer_start(&timer);
return timer;
}
void timer_start(Timer* timer) {
timer->start_time = time_now();
timer->last_tick = timer->start_time;
timer->running_time = 0;
timer->delta_time = 0;
}
void timer_tick(Timer* timer) {
const time_point this_tick = time_now();
timer->running_time = time_diff(timer->start_time, this_tick);
timer->delta_time = time_diff(timer->last_tick, this_tick);
timer->last_tick = this_tick;
}
time_point time_now(void) {
time_point t;
#ifdef _WIN32
QueryPerformanceCounter((LARGE_INTEGER*)&t);
#else
clock_gettime(CLOCK_REALTIME, &t);
#endif
return t;
}
time_delta time_diff(time_point start, time_point end) {
#ifdef _WIN32
// Force nonnegative. The DXSDK's CDXUTTimer mentions that if the
// processor goes into a power save mode or we get shuffled to
// another processor, then the delta time can be negative.
return std::max(0, end - start);
#else
return (end.tv_sec - start.tv_sec) * 1e9 + (end.tv_nsec - start.tv_nsec);
#endif
}
double time_delta_to_sec(time_delta dt) {
#ifdef _WIN32
return (double)dt * seconds_per_count;
#else
return (double)dt * 1.0e-9;
#endif
}
time_delta sec_to_time_delta(double seconds) {
#ifdef _WIN32
return (time_delta)(seconds / seconds_per_count);
#else
return (time_delta)(seconds * 1.0e9);
#endif
}
void time_sleep(time_delta dt) {
#ifdef _WIN32
const int64_t ms = dt / microseconds;
Sleep((DWORD)(ms));
#else
const int64_t sec = dt / nanoseconds;
struct timespec ts;
ts.tv_sec = (long)sec;
ts.tv_nsec = (long)(dt % nanoseconds);
nanosleep(&ts, NULL);
#endif
}
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