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Introduce new run frame rate management support to allow control of maximum frame rate and to support on demand rendering of frames

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This commit is contained in:
Robert Osfield
2009-04-24 16:20:50 +00:00
parent 860ae27faf
commit a50f0ccfaf
10 changed files with 198 additions and 57 deletions
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71
src/osgViewer/ViewerBase.cpp
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@@ -33,25 +33,24 @@ static osg::ApplicationUsageProxy ViewerBase_e0(osg::ApplicationUsage::ENVIRONME
static osg::ApplicationUsageProxy ViewerBase_e1(osg::ApplicationUsage::ENVIRONMENTAL_VARIABLE,"OSG_THREADING <value>","Set the threading model using by Viewer, <value> can be SingleThreaded, CullDrawThreadPerContext, DrawThreadPerContext or CullThreadPerCameraDrawThreadPerContext.");
static osg::ApplicationUsageProxy ViewerBase_e2(osg::ApplicationUsage::ENVIRONMENTAL_VARIABLE,"OSG_SCREEN <value>","Set the default screen that windows should open up on.");
static osg::ApplicationUsageProxy ViewerBase_e3(osg::ApplicationUsage::ENVIRONMENTAL_VARIABLE,"OSG_WINDOW x y width height","Set the default window dimensions that windows should open up on.");
static osg::ApplicationUsageProxy ViewerBase_e4(osg::ApplicationUsage::ENVIRONMENTAL_VARIABLE,"OSG_RUN_FRAME_SCHEME","Frame rate manage scheme that viewer run should use, ON_DEMAND or CONTINUOUS (default).");
static osg::ApplicationUsageProxy ViewerBase_e5(osg::ApplicationUsage::ENVIRONMENTAL_VARIABLE,"OSG_RUN_MAX_FRAME_RATE","Set the maximum number of frame as second that viewer run. 0.0 is default and disables an frame rate capping.");
using namespace osgViewer;
ViewerBase::ViewerBase():
osg::Object(true)
{
_firstFrame = true;
_done = false;
_keyEventSetsDone = osgGA::GUIEventAdapter::KEY_Escape;
_quitEventSetsDone = true;
_releaseContextAtEndOfFrameHint = true;
_threadingModel = AutomaticSelection;
_threadsRunning = false;
_endBarrierPosition = AfterSwapBuffers;
viewerBaseInit();
}
ViewerBase::ViewerBase(const ViewerBase& base):
osg::Object(true)
{
viewerBaseInit();
}
void ViewerBase::viewerBaseInit()
{
_firstFrame = true;
_done = false;
@@ -61,6 +60,24 @@ ViewerBase::ViewerBase(const ViewerBase& base):
_threadingModel = AutomaticSelection;
_threadsRunning = false;
_endBarrierPosition = AfterSwapBuffers;
_requestRedraw = true;
_requestContinousUpdate = false;
_runFrameScheme = CONTINUOUS;
_runMaxFrameRate = 0.0f;
const char* str = getenv("OSG_RUN_FRAME_SCHEME");
if (str)
{
if (strcmp(str, "ON_DEMAND")==0) _runFrameScheme = ON_DEMAND;
else if (strcmp(str, "CONTINUOUS")==0) _runFrameScheme = CONTINUOUS;
}
str = getenv("OSG_RUN_MAX_FRAME_RATE");
if (str)
{
_runMaxFrameRate = atof(str);
}
}
void ViewerBase::setThreadingModel(ThreadingModel threadingModel)
@@ -573,30 +590,28 @@ int ViewerBase::run()
realize();
}
#if 0
while (!done())
{
frame();
}
#else
const char* str = getenv("OSG_RUN_FRAME_COUNT");
if (str)
int runTillFrameNumber = str==0 ? -1 : atoi(str);
while(!done() || (runTillFrameNumber>=0 && getViewerFrameStamp()->getFrameNumber()>runTillFrameNumber))
{
int runTillFrameNumber = atoi(str);
while (!done() && getViewerFrameStamp()->getFrameNumber()<runTillFrameNumber)
double minFrameTime = _runMaxFrameRate>0.0 ? 1.0/_runMaxFrameRate : 0.0;
osg::Timer_t startFrameTick = osg::Timer::instance()->tick();
if (_runFrameScheme==ON_DEMAND)
{
if (checkNeedToDoFrame()) frame();
}
else
{
frame();
}
// work out if we need to force a sleep to hold back the frame rate
osg::Timer_t endFrameTick = osg::Timer::instance()->tick();
double frameTime = osg::Timer::instance()->delta_s(startFrameTick, endFrameTick);
if (frameTime < minFrameTime) OpenThreads::Thread::microSleep(1000000.0*(minFrameTime-frameTime));
}
else
{
while (!done())
{
frame();
}
}
#endif
return 0;
}
@@ -842,5 +857,7 @@ void ViewerBase::renderingTraversals()
getViewerStats()->setAttribute(frameStamp->getFrameNumber(), "Rendering traversals end time ", endRenderingTraversals);
getViewerStats()->setAttribute(frameStamp->getFrameNumber(), "Rendering traversals time taken", endRenderingTraversals-beginRenderingTraversals);
}
_requestRedraw = false;
}