FGFS-4.1/OpenSceneGraph
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Experimentation with new timing code.

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This commit is contained in:
Robert Osfield
2004-09-30 19:36:15 +00:00
parent 3363d35ee6
commit 935f2a62e5
3 changed files with 53 additions and 5 deletions
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30
src/osgProducer/OsgSceneHandler.cpp
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@@ -23,6 +23,8 @@ using namespace osgProducer;
OsgSceneHandler::OsgSceneHandler( osg::DisplaySettings *ds) :
_sceneView(new osgUtil::SceneView(ds))
{
_frameStartTick = 0;
_previousFrameStartTick = 0;
}
void OsgSceneHandler::init()
@@ -41,6 +43,7 @@ void OsgSceneHandler::init()
void OsgSceneHandler::clearImplementation(Producer::Camera& /*camera*/)
{
_previousFrameStartTick = _frameStartTick;
_frameStartTick = osg::Timer::instance()->tick();
osgDB::DatabasePager* dp = osgDB::Registry::instance()->getDatabasePager();
@@ -81,20 +84,41 @@ void OsgSceneHandler::drawImplementation(Producer::Camera &)
osgDB::DatabasePager* dp = osgDB::Registry::instance()->getDatabasePager();
if (dp)
{
double timeForPreviousFrame = osg::Timer::instance()->delta_s(_previousFrameStartTick, _frameStartTick);
double timeForCullAndDraw = osg::Timer::instance()->delta_s(_frameStartTick, osg::Timer::instance()->tick());
double targetMaxFrameTime = 0.010; // 10ms.
double minimumTargetMaxFrameTime = 0.010; // 10ms.
double targetMaxFrameTime = osg::minimum(timeForPreviousFrame, minimumTargetMaxFrameTime);
double availableTime = targetMaxFrameTime-timeForCullAndDraw;
// availableTime = 0.1; // 2.5 ms
double maximumAvailableTime = 0.0025; // 2.5ms.
double drawCostFactor = 2.0; // must be greater than 1 to account for the extra cost of emptying the OpenGL fifo.
double frameFactor = 0.9; // must be less than 1, to compensate for extra time spent in update and swap buffers etc.
double timeLeftTillEndOfFrame = targetMaxFrameTime*frameFactor - timeForCullAndDraw*drawCostFactor;
double availableTime = timeLeftTillEndOfFrame / drawCostFactor; // account for the fifo when download texture objects.
static unsigned int _numFramesThatNoTimeAvailable = 0;
static unsigned int _maxNumFramesThatNoTimeAvailable = 10;
if (_numFramesThatNoTimeAvailable>_maxNumFramesThatNoTimeAvailable)
{
availableTime = 0.0025; // 2.5ms.
}
if (availableTime>0.0)
{
_numFramesThatNoTimeAvailable = 0;
// osg::notify(osg::NOTICE)<<"Time available = "<<availableTime<<std::endl;
dp->compileGLObjects(*(getSceneView()->getState()),availableTime);
// flush deleted GL objects.
getSceneView()->flushDeletedGLObjects(availableTime);
}
else
{
++_numFramesThatNoTimeAvailable;
}
dp->signalEndFrame();
}