time_timer.c

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/* timer() function */

#include "../fb.h"
#include <time.h>
#include <windows.h>

#define TIMER_NONE    0
#define TIMER_NORMAL  1
#define TIMER_HIGHRES 2
static int timer = TIMER_NONE;
static double frequency;

FBCALL double fb_Timer( void )
{
        LARGE_INTEGER count;

        if( timer == TIMER_NONE ) {
                if( QueryPerformanceFrequency( &count ) ) {
                        frequency = 1.0 / (double)count.QuadPart;
                        timer = TIMER_HIGHRES;
                } else {
                        timer = TIMER_NORMAL;
                }
        }

        if( timer == TIMER_NORMAL ) {
                return (double)GetTickCount( ) * 0.001;
        } else {
                QueryPerformanceCounter( &count );
                return (double)count.QuadPart * frequency;
        }
}