KeosRenderTarget.cpp

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/*
 * This source file is part of KEOS (Free 3D Engine)
 * For the latest info, see http://www.keosengine.org/
 * E-mails : thierry.vouriot@keosengine.org, yeri@keosengine.org
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place - Suite 330, Boston, MA 02111-1307, USA, or go to
 * http://www.gnu.org/copyleft/lesser.txt.
 *
 */
#include "KeosRenderTarget.h"
#include "KeosRoot.h"
#include "KeosTimer.h"
#include "KeosLogger.h"

namespace Keos
{
  //=======================================================================
  // IRenderSystem implementation
  //=======================================================================

  //-----------------------------------------------------------------------
  IRenderTarget::IRenderTarget()
  {
    m_pRenderApp = NULL;

    // Default to no stats display
    m_bActive = true;
    m_bAutoUpdate = true;

    m_pTimer = CRoot::Instance().GetTimer();
    ResetStatistics();
  }

  //-----------------------------------------------------------------------
  IRenderTarget::~IRenderTarget()
  {
    if (m_pRenderApp && m_pRenderApp->IsInit())
    {
      m_pRenderApp->Release();
    }
    ILogger::Log("<-- Destroy RenderTarget '%s'", m_strName.c_str());
  }

  //-----------------------------------------------------------------------
  void IRenderTarget::GetMetrics(uint& nWidth, uint& nHeight, uint& nColourDepth)
  {
    nWidth = m_nWidth;
    nHeight = m_nHeight;
    nColourDepth = m_nColourDepth;
  }

  //-----------------------------------------------------------------------
  void IRenderTarget::Init(void)
  {
    ILogger::Log("--> Init RenderTarget '%s'", m_strName.c_str());
    m_pRenderApp->Init();
    m_pRenderApp->SetInit(true);
  }

  //-----------------------------------------------------------------------
  void IRenderTarget::Update(void)
  {
    m_Stats.triangleCount = 0;

    // Update statistics (always on top)
    UpdateStats();

    m_pRenderApp->Update();
    m_pRenderApp->Render();
  }

  //-----------------------------------------------------------------------
  void IRenderTarget::ResetStatistics(void)
  {
    m_Stats.avgFPS = 0.0;
    m_Stats.bestFPS = 0.0;
    m_Stats.lastFPS = 0.0;
    m_Stats.worstFPS = 999.0;
    m_Stats.triangleCount = 0;
    m_Stats.bestFrameTime = 999999;
    m_Stats.worstFrameTime = 0;
    m_Stats.lastFrameTime = 0;

    m_nLastTime = m_pTimer->GetMilliseconds();
    m_nLastSecond = m_nLastTime;
    m_nFrameCount = 0;
  }

  //-----------------------------------------------------------------------
  void IRenderTarget::UpdateStats(void)
  {
    ++m_nFrameCount;
    unsigned long thisTime = m_pTimer->GetMilliseconds();

    // check frame time
    unsigned long frameTime = thisTime - m_nLastTime ;
    m_Stats.lastFrameTime = frameTime;
    m_nLastTime = thisTime ;

    m_Stats.bestFrameTime = std::min(m_Stats.bestFrameTime, frameTime);
    m_Stats.worstFrameTime = std::max(m_Stats.worstFrameTime, frameTime);

    // check if new second (update only once per second)
    if (thisTime - m_nLastSecond > 1000)
    {
      // new second - not 100% precise
      m_Stats.lastFPS = (float)m_nFrameCount / (float)(thisTime - m_nLastSecond) * 1000.0;

      if (m_Stats.avgFPS == 0)
        m_Stats.avgFPS = m_Stats.lastFPS;
      else
        m_Stats.avgFPS = (m_Stats.avgFPS + m_Stats.lastFPS) / 2; // not strictly correct, but good enough

      m_Stats.bestFPS = std::max(m_Stats.bestFPS, m_Stats.lastFPS);
      m_Stats.worstFPS = std::min(m_Stats.worstFPS, m_Stats.lastFPS);

      m_nLastSecond = thisTime ;
      m_nFrameCount  = 0;

    }
  }

} // namespace Keos

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