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#include <BH/Timer.h>
#include <stdlib.h>
#include <windows.h>
#define TYPE_TICKS 0x0000
#define TYPE_COUNTER 0x0001
struct BH_Timer
{
int type;
LARGE_INTEGER frequency;
int64_t sec;
int64_t nsec;
};
static int checkAvailableTimer(LARGE_INTEGER *frequency)
{
LARGE_INTEGER dummy;
if (QueryPerformanceFrequency(frequency))
{
if (QueryPerformanceCounter(&dummy))
{
return TYPE_COUNTER;
}
}
return TYPE_TICKS;
}
static void getTimer(int type,
LARGE_INTEGER *frequency,
int64_t *sec,
int64_t *nsec)
{
LARGE_INTEGER newCount;
int64_t newTicks;
switch (type)
{
case TYPE_COUNTER:
QueryPerformanceCounter(&newCount);
*sec = newCount.QuadPart / frequency->QuadPart;
*nsec = (newCount.QuadPart - *sec * frequency->QuadPart) * 1000000000 / frequency->QuadPart;
break;
default:
case TYPE_TICKS:
newTicks = GetTickCount64();
*sec = newTicks / 1000;
*nsec = (newTicks - *sec * 1000) * 1000000;
break;
}
}
BH_Timer *BH_TimerNew(void)
{
BH_Timer *result;
result = malloc(sizeof(*result));
if (result)
{
result->type = checkAvailableTimer(&result->frequency);
BH_TimerStart(result);
}
return result;
}
void BH_TimerFree(BH_Timer *timer)
{
free(timer);
}
int BH_TimerIsMonotonic(BH_Timer *timer)
{
return timer->type == TYPE_COUNTER;
}
void BH_TimerStart(BH_Timer *timer)
{
getTimer(timer->type, &timer->frequency, &timer->sec, &timer->nsec);
}
int64_t BH_TimerRestart(BH_Timer *timer)
{
int64_t oldSec, oldNsec;
oldSec = timer->sec; oldNsec = timer->nsec;
getTimer(timer->type, &timer->frequency, &timer->sec, &timer->nsec);
oldSec = timer->sec - oldSec;
oldNsec = timer->nsec - oldNsec;
return (oldSec * 1000) + (oldNsec / 1000000);
}
int64_t BH_TimerMilliseconds(BH_Timer *timer)
{
int64_t newSec, newNsec;
getTimer(timer->type, &timer->frequency, &newSec, &newNsec);
newSec -= timer->sec;
newNsec -= timer->nsec;
return (newSec * 1000) + (newNsec / 1000000);
}
int64_t BH_TimerNanoseconds(BH_Timer *timer)
{
int64_t newSec, newNsec;
getTimer(timer->type, &timer->frequency, &newSec, &newNsec);
newSec -= timer->sec;
newNsec -= timer->nsec;
return (newSec * 1000000000) + newNsec;
}
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