FrameRateTracker.cpp

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/*
 * FrameRateTracker.cpp
 *
 * Part of Fly! Legacy project
 *
 * Copyright 2005 Chris Wallace
 *
 * Fly! Legacy is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 * Fly! Legacy is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 *   along with Fly! Legacy; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include "../Include/FrameRateTracker.h"
#include "../Include/FlyLegacy.h"
#include "../Include/Ui.h"


CFrameRateTracker::CFrameRateTracker (unsigned int maxSamples)
{
  this->maxSamples = maxSamples;
  this->actualSamples = 0;
  this->nextSample = 0;
  samples = new float[maxSamples];
}

CFrameRateTracker::~CFrameRateTracker (void)
{
  if (samples != NULL) delete[] samples;
}

void CFrameRateTracker::SetMaxSamples (unsigned int newMaxSamples)
{
  // Allocate new buffer
  float *newSamples = new float[newMaxSamples];

  // Copy samples from old buffer to the new buffer; if the new number of max samples
  //   is less than the actual number in-use in the old buffer then only the most
  //   recent are copied
  unsigned int nSamples = actualSamples;
  if (nSamples > newMaxSamples) nSamples = newMaxSamples;

  for (unsigned int i=0; i<nSamples; i++) {
    newSamples[i] = samples[(nextSample-nSamples+i) % maxSamples];
  }

  // Deallocate old samples buffer
  delete[] samples;

  // Set class members to reflect new buffer state; note actualSamples does not change
  this->maxSamples = maxSamples;
  this->nextSample = nSamples;
  this->samples = newSamples;
}

unsigned int CFrameRateTracker::GetMaxSamples (void)
{
  return maxSamples;
}

unsigned int CFrameRateTracker::GetActualSamples (void)
{
  return actualSamples;
}

float CFrameRateTracker::GetSample (unsigned int i)
{
  int iSample = (maxSamples + nextSample - actualSamples + i) % maxSamples;
  return samples[iSample];
}

void CFrameRateTracker::GetSamples (float *outSamples)
{
  for (unsigned int i=0; i<actualSamples; i++) {
    outSamples[i] = GetSample (i);
  }
}

void CFrameRateTracker::AddSample (float f)
{
  samples[nextSample] = f;
  if (actualSamples < maxSamples) {
    actualSamples++;
  }
  nextSample = (nextSample + 1) % maxSamples;
}

void CFrameRateTracker::ClearSamples (void)
{
  nextSample = 0;
  actualSamples = 0;
}

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