FrameCounter.cpp

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#include "GlobalGL.h"
#include "FrameCounter.h"


FrameCounter::FrameCounter( void ) {
  frames = 0;
  //start = glutGet( GLUT_ELAPSED_TIME );
  fps = 0;
  m_frameStart = start = getTime();
  m_lastFrameTime = 0;
}

FrameCounter::~FrameCounter( void ) {

}


int FrameCounter::getFrameRateAverage( void ) {
  return fps;
}

long FrameCounter::getFrameStart( void ) {
  return m_frameStart;
}


float FrameCounter::getFrameTimeAverage( void ) {
  return 1000.0/getFrameRateAverage();
}

long FrameCounter::getFrameTimeCurrent( void ) {
  long now = getTime();
  long passed = getFrameStart();
  return now - passed;
}

long FrameCounter::getFrameTimeLast( void ) {
  return m_lastFrameTime;
}

long FrameCounter::getTime( void ) {
  return glutGet( GLUT_ELAPSED_TIME );
}


void FrameCounter::newFrame( void ) {
  long now = getTime();
  m_lastFrameTime = now - m_frameStart;
  m_frameStart = now;
  frames++;
}


void FrameCounter::update( void ) {
  long now = getTime();
  long dTime = now - start;

  if( dTime > 1000 ) {
    start = now;
    fps = (long)(1e3  * (double)frames/(double) dTime);
    frames = 0;
  }
}