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//
// libavg - Media Playback Engine.
// Copyright (C) 2003-2014 Ulrich von Zadow
//
// This library 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 library 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 library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// Current versions can be found at www.libavg.de
//
#include "DisplayEngine.h"
#include "../base/Logger.h"
#include "../base/ScopeTimer.h"
#include "../base/TimeSource.h"
#include "../base/Exception.h"
#include "../graphics/GLContext.h"
#include "../graphics/Display.h"
using namespace std;
namespace avg {
DisplayEngine::DisplayEngine()
: m_NumFrames(0),
m_VBRate(0),
m_Framerate(60),
m_bInitialized(false),
m_EffFramerate(0)
{
}
DisplayEngine::~DisplayEngine()
{
}
void DisplayEngine::initRender()
{
m_NumFrames = 0;
m_FramesTooLate = 0;
m_TimeSpentWaiting = 0;
m_StartTime = TimeSource::get()->getCurrentMicrosecs();
m_LastFrameTime = m_StartTime;
m_bInitialized = true;
if (m_VBRate != 0) {
setVBlankRate(m_VBRate);
} else {
setFramerate(m_Framerate);
}
}
void DisplayEngine::deinitRender()
{
AVG_TRACE(Logger::category::PROFILE, Logger::severity::INFO,
"Framerate statistics: ");
AVG_TRACE(Logger::category::PROFILE, Logger::severity::INFO,
" Total frames: " <<m_NumFrames);
float TotalTime = float(TimeSource::get()->getCurrentMicrosecs()
-m_StartTime)/1000000;
AVG_TRACE(Logger::category::PROFILE, Logger::severity::INFO,
" Total time: " << TotalTime << " seconds");
float actualFramerate = (m_NumFrames+1)/TotalTime;
AVG_TRACE(Logger::category::PROFILE, Logger::severity::INFO,
" Framerate achieved: " << actualFramerate);
AVG_TRACE(Logger::category::PROFILE, Logger::severity::INFO,
" Frames too late: " << m_FramesTooLate);
AVG_TRACE(Logger::category::PROFILE, Logger::severity::INFO,
" Percent of time spent waiting: "
<< float (m_TimeSpentWaiting)/(10000*TotalTime));
if (m_Framerate != 0) {
AVG_TRACE(Logger::category::PROFILE, Logger::severity::INFO,
" Framerate goal was: " << m_Framerate);
if (m_Framerate*2 < actualFramerate && m_NumFrames > 10) {
AVG_LOG_WARNING("Actual framerate was a lot higher than framerate goal.\
Is vblank sync forced off?");
}
}
m_bInitialized = false;
}
void DisplayEngine::setFramerate(float rate)
{
if (rate != 0 && m_bInitialized) {
GLContext::getMain()->initVBlank(0);
}
m_Framerate = rate;
m_VBRate = 0;
}
float DisplayEngine::getFramerate()
{
return m_Framerate;
}
float DisplayEngine::getEffectiveFramerate()
{
return m_EffFramerate;
}
void DisplayEngine::setVBlankRate(int rate)
{
m_VBRate = rate;
if (m_bInitialized) {
bool bOK = GLContext::getMain()->initVBlank(rate);
m_Framerate = Display::get()->getRefreshRate()/m_VBRate;
if (!bOK || rate == 0) {
AVG_LOG_WARNING("Using framerate of " << m_Framerate <<
" instead of VBRate of " << m_VBRate);
m_VBRate = 0;
}
}
}
bool DisplayEngine::wasFrameLate()
{
return m_bFrameLate;
}
static ProfilingZoneID WaitProfilingZone("Render - wait");
void DisplayEngine::frameWait()
{
ScopeTimer Timer(WaitProfilingZone);
m_NumFrames++;
m_FrameWaitStartTime = TimeSource::get()->getCurrentMicrosecs();
m_TargetTime = m_LastFrameTime+(long long)(1000000/m_Framerate);
m_bFrameLate = false;
if (m_VBRate == 0) {
if (m_FrameWaitStartTime <= m_TargetTime) {
long long WaitTime = (m_TargetTime-m_FrameWaitStartTime)/1000;
if (WaitTime > 5000) {
AVG_LOG_WARNING("DisplayEngine: waiting " << WaitTime << " ms.");
}
TimeSource::get()->sleepUntil(m_TargetTime/1000);
}
}
}
long long DisplayEngine::getDisplayTime()
{
return (m_LastFrameTime-m_StartTime)/1000;
}
void DisplayEngine::checkJitter()
{
if (m_LastFrameTime == 0) {
m_EffFramerate = 0;
} else {
long long CurIntervalTime = TimeSource::get()->getCurrentMicrosecs()
-m_LastFrameTime;
m_EffFramerate = 1000000.0f/CurIntervalTime;
}
long long frameTime = TimeSource::get()->getCurrentMicrosecs();
int maxDelay;
if (m_VBRate == 0) {
maxDelay = 2;
} else {
maxDelay = 6;
}
if ((frameTime - m_TargetTime)/1000 > maxDelay || m_bFrameLate) {
m_bFrameLate = true;
m_FramesTooLate++;
}
m_LastFrameTime = frameTime;
m_TimeSpentWaiting += m_LastFrameTime-m_FrameWaitStartTime;
// cerr << m_LastFrameTime << ", m_FrameWaitStartTime=" << m_FrameWaitStartTime << endl;
// cerr << m_TimeSpentWaiting << endl;
}
}
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