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From Tim More and Robert Osfield, implementation of ARB_timer_query based GPU timing stats syncronization.

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Initial email from Tim : "I've implemented using a timestamp, available with ARB_timer_query and OpenGL 3.3, to gather GPU stats. This is nice because it can accurately fix the GPU draw time with respect to the other times on the stats graph, rather than having to estimate the wall time of the end of GPU drawing. This also prevents anomalies like the GPU phase starting before the draw phase..."
Changes to Tim's submission by Robert:  Removal of need for swap buffer callback in ViewerBase.cpp, by
integrating a osg::State::frameCompleted() method that does the stats timing collection.  Introduction of a
GraphicsContext::swapBuffersCallbackOrImplementation() method that calls the State::frameCompleted() and
the swap buffers callback or the swapImplementation as required.
This commit is contained in:
Robert Osfield
2010-11-10 16:58:58 +00:00
parent 40c6d99c15
commit 68f37c4dcb
9 changed files with 352 additions and 120 deletions
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242
src/osgViewer/Renderer.cpp
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@@ -36,15 +36,37 @@ using namespace osgViewer;
OpenGLQuerySupport::OpenGLQuerySupport():
_startTick(0),
_initialized(false),
_timerQuerySupported(false),
_extensions(0),
_extensions(0)
{
}
class OSGVIEWER_EXPORT EXTQuerySupport : public OpenGLQuerySupport
{
public:
EXTQuerySupport();
void checkQuery(osg::Stats* stats, osg::State* state, osg::Timer_t startTick);
virtual void beginQuery(int frameNumber, osg::State* state);
virtual void endQuery(osg::State* state);
virtual void initialize(osg::State* state, osg::Timer_t startTick);
protected:
GLuint createQueryObject();
typedef std::pair<GLuint, int> QueryFrameNumberPair;
typedef std::list<QueryFrameNumberPair> QueryFrameNumberList;
typedef std::vector<GLuint> QueryList;
QueryFrameNumberList _queryFrameNumberList;
QueryList _availableQueryObjects;
double _previousQueryTime;
};
EXTQuerySupport::EXTQuerySupport():
_previousQueryTime(0.0)
{
}
void OpenGLQuerySupport::checkQuery(osg::Stats* stats)
void EXTQuerySupport::checkQuery(osg::Stats* stats, osg::State* state,
osg::Timer_t startTick)
{
for(QueryFrameNumberList::iterator itr = _queryFrameNumberList.begin();
itr != _queryFrameNumberList.end();
@@ -59,7 +81,7 @@ void OpenGLQuerySupport::checkQuery(osg::Stats* stats)
_extensions->glGetQueryObjectui64v(query, GL_QUERY_RESULT, &timeElapsed);
double timeElapsedSeconds = double(timeElapsed)*1e-9;
double currentTime = osg::Timer::instance()->delta_s(_startTick, osg::Timer::instance()->tick());
double currentTime = osg::Timer::instance()->delta_s(startTick, osg::Timer::instance()->tick());
double estimatedEndTime = (_previousQueryTime + currentTime) * 0.5;
double estimatedBeginTime = estimatedEndTime - timeElapsedSeconds;
@@ -77,10 +99,10 @@ void OpenGLQuerySupport::checkQuery(osg::Stats* stats)
}
}
_previousQueryTime = osg::Timer::instance()->delta_s(_startTick, osg::Timer::instance()->tick());
_previousQueryTime = osg::Timer::instance()->delta_s(startTick, osg::Timer::instance()->tick());
}
GLuint OpenGLQuerySupport::createQueryObject()
GLuint EXTQuerySupport::createQueryObject()
{
if (_availableQueryObjects.empty())
{
@@ -96,26 +118,169 @@ GLuint OpenGLQuerySupport::createQueryObject()
}
}
void OpenGLQuerySupport::beginQuery(int frameNumber)
void EXTQuerySupport::beginQuery(int frameNumber, osg::State* state)
{
GLuint query = createQueryObject();
_extensions->glBeginQuery(GL_TIME_ELAPSED, query);
_queryFrameNumberList.push_back(QueryFrameNumberPair(query, frameNumber));
}
void OpenGLQuerySupport::endQuery()
void EXTQuerySupport::endQuery(osg::State* state)
{
_extensions->glEndQuery(GL_TIME_ELAPSED);
}
void OpenGLQuerySupport::initialize(osg::State* state)
void OpenGLQuerySupport::initialize(osg::State* state, osg::Timer_t startTick)
{
if (_initialized) return;
_initialized = true;
_extensions = osg::Drawable::getExtensions(state->getContextID(),true);
_timerQuerySupported = _extensions && _extensions->isTimerQuerySupported();
_previousQueryTime = osg::Timer::instance()->delta_s(_startTick, osg::Timer::instance()->tick());
}
void EXTQuerySupport::initialize(osg::State* state, osg::Timer_t startTick)
{
OpenGLQuerySupport::initialize(state, startTick);
_previousQueryTime = osg::Timer::instance()->delta_s(startTick, osg::Timer::instance()->tick());
}
class ARBQuerySupport : public OpenGLQuerySupport
{
public:
virtual void checkQuery(osg::Stats* stats, osg::State* state,
osg::Timer_t startTick);
virtual void beginQuery(int frameNumber, osg::State* state);
virtual void endQuery(osg::State* state);
virtual void initialize(osg::State* state, osg::Timer_t startTick);
protected:
typedef std::pair<GLuint, GLuint> QueryPair;
struct ActiveQuery {
ActiveQuery() : queries(0, 0), frameNumber(0) {}
ActiveQuery(GLuint start_, GLuint end_, int frameNumber_)
: queries(start_, end_), frameNumber(frameNumber_)
{
}
ActiveQuery(const QueryPair& queries_, int frameNumber_)
: queries(queries_), frameNumber(frameNumber_)
{
}
QueryPair queries;
int frameNumber;
};
typedef std::list<ActiveQuery> QueryFrameList;
typedef std::vector<QueryPair> QueryList;
QueryFrameList _queryFrameList;
QueryList _availableQueryObjects;
};
void ARBQuerySupport::initialize(osg::State* state, osg::Timer_t startTick)
{
OpenGLQuerySupport::initialize(state, startTick);
}
void ARBQuerySupport::beginQuery(int frameNumber, osg::State* state)
{
QueryPair query;
if (_availableQueryObjects.empty())
{
_extensions->glGenQueries(1, &query.first);
_extensions->glGenQueries(1, &query.second);
}
else
{
query = _availableQueryObjects.back();
_availableQueryObjects.pop_back();
}
_extensions->glQueryCounter(query.first, GL_TIMESTAMP);
_queryFrameList.push_back(ActiveQuery(query, frameNumber));
}
void ARBQuerySupport::endQuery(osg::State* state)
{
_extensions->glQueryCounter(_queryFrameList.back().queries.second,
GL_TIMESTAMP);
}
void ARBQuerySupport::checkQuery(osg::Stats* stats, osg::State* state,
osg::Timer_t startTick)
{
for(QueryFrameList::iterator itr = _queryFrameList.begin();
itr != _queryFrameList.end();
)
{
GLint available = 0;
// If the end query is available, the begin query must be too.
_extensions->glGetQueryObjectiv(itr->queries.second,
GL_QUERY_RESULT_AVAILABLE, &available);
if (available)
{
QueryPair queries = itr->queries;
GLuint64EXT beginTimestamp = 0;
GLuint64EXT endTimestamp = 0;
_extensions->glGetQueryObjectui64v(queries.first, GL_QUERY_RESULT,
&beginTimestamp);
_extensions->glGetQueryObjectui64v(queries.second, GL_QUERY_RESULT,
&endTimestamp);
GLuint64EXT gpuTimestamp = state->getGpuTimestamp();
// Have any of the timestamps wrapped around?
int tbits = state->getTimestampBits();
if (tbits < 64)
{
// If the high bits on any of the timestamp bits are
// different then the counters may have wrapped.
const int hiShift = (tbits - 1);
const GLuint64EXT hiMask = 1 << hiShift;
const GLuint64EXT sum = (beginTimestamp >> hiShift)
+ (endTimestamp >> hiShift) + (gpuTimestamp >> hiShift);
if (sum == 1 || sum == 2) {
const GLuint64EXT wrapAdd = 1 << tbits;
// Counter wrapped between begin and end?
if (beginTimestamp > endTimestamp)
{
endTimestamp += wrapAdd;
}
else if (gpuTimestamp < beginTimestamp
&& beginTimestamp - gpuTimestamp > (hiMask >> 1))
{
gpuTimestamp += wrapAdd;
}
else if (endTimestamp < gpuTimestamp
&& gpuTimestamp - endTimestamp > (hiMask >> 1))
{
beginTimestamp += wrapAdd;
endTimestamp += wrapAdd;
}
}
}
GLuint64EXT timeElapsed = endTimestamp - beginTimestamp;
double timeElapsedSeconds = double(timeElapsed)*1e-9;
double gpuTick = state->getGpuTime();
double beginTime = 0.0;
double endTime = 0.0;
if (beginTimestamp > gpuTimestamp)
beginTime = gpuTick
+ double(beginTimestamp - gpuTimestamp) * 1e-9;
else
beginTime = gpuTick
- double(gpuTimestamp - beginTimestamp) * 1e-9;
if (endTimestamp > gpuTimestamp)
endTime = gpuTick
+ double(endTimestamp - gpuTimestamp) * 1e-9;
else
endTime = gpuTick
- double(gpuTimestamp - endTimestamp) * 1e-9;
stats->setAttribute(itr->frameNumber, "GPU draw begin time",
beginTime);
stats->setAttribute(itr->frameNumber, "GPU draw end time", endTime);
stats->setAttribute(itr->frameNumber, "GPU draw time taken",
timeElapsedSeconds);
itr = _queryFrameList.erase(itr);
_availableQueryObjects.push_back(queries);
}
else
{
++itr;
}
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -162,7 +327,6 @@ static OpenThreads::Mutex s_drawSerializerMutex;
// Renderer
Renderer::Renderer(osg::Camera* camera):
osg::GraphicsOperation("Renderer",true),
OpenGLQuerySupport(),
_targetFrameRate(100.0),
_minimumTimeAvailableForGLCompileAndDeletePerFrame(0.001),
_flushTimeRatio(0.5),
@@ -170,7 +334,9 @@ Renderer::Renderer(osg::Camera* camera):
_camera(camera),
_done(false),
_graphicsThreadDoesCull(true),
_compileOnNextDraw(true)
_compileOnNextDraw(true),
_initialized(false),
_startTick(0)
{
DEBUG_MESSAGE<<"Render::Render() "<<this<<std::endl;
@@ -238,6 +404,21 @@ Renderer::~Renderer()
DEBUG_MESSAGE<<"Render::~Render() "<<this<<std::endl;
}
void Renderer::initialize(osg::State* state)
{
if (!_initialized)
{
_initialized = true;
osg::Drawable::Extensions* ext = osg::Drawable::getExtensions(state->getContextID(), true);
if (ext->isARBTimerQuerySupported())
_querySupport = new ARBQuerySupport();
else if (ext->isTimerQuerySupported())
_querySupport = new EXTQuerySupport();
if (_querySupport.valid())
_querySupport->initialize(state, _startTick);
}
}
void Renderer::setGraphicsThreadDoesCull(bool flag)
{
if (_graphicsThreadDoesCull==flag) return;
@@ -296,6 +477,7 @@ void Renderer::updateSceneView(osgUtil::SceneView* sceneView)
sceneView->setDisplaySettings(ds);
if (view) _startTick = view->getStartTick();
if (state) state->setStartTick(_startTick);
}
void Renderer::compile()
@@ -477,18 +659,18 @@ void Renderer::draw()
state->getDynamicObjectRenderingCompletedCallback()->completed(state);
}
bool acquireGPUStats = stats && _timerQuerySupported && stats->collectStats("gpu");
bool acquireGPUStats = stats && _querySupport && stats->collectStats("gpu");
if (acquireGPUStats)
{
checkQuery(stats);
_querySupport->checkQuery(stats, state, _startTick);
}
// do draw traversal
if (acquireGPUStats)
{
checkQuery(stats);
beginQuery(frameNumber);
_querySupport->checkQuery(stats, state, _startTick);
_querySupport->beginQuery(frameNumber, state);
}
osg::Timer_t beforeDrawTick;
@@ -519,8 +701,8 @@ void Renderer::draw()
if (acquireGPUStats)
{
endQuery();
checkQuery(stats);
_querySupport->endQuery(state);
_querySupport->checkQuery(stats, state, _startTick);
}
//glFlush();
@@ -585,11 +767,11 @@ void Renderer::cull_draw()
initialize(state);
}
bool acquireGPUStats = stats && _timerQuerySupported && stats->collectStats("gpu");
bool acquireGPUStats = stats && _querySupport && stats->collectStats("gpu");
if (acquireGPUStats)
{
checkQuery(stats);
_querySupport->checkQuery(stats, state, _startTick);
}
// do cull traversal
@@ -626,8 +808,8 @@ void Renderer::cull_draw()
// do draw traversal
if (acquireGPUStats)
{
checkQuery(stats);
beginQuery(frameNumber);
_querySupport->checkQuery(stats, state, _startTick);
_querySupport->beginQuery(frameNumber, state);
}
osg::Timer_t beforeDrawTick;
@@ -656,8 +838,8 @@ void Renderer::cull_draw()
if (acquireGPUStats)
{
endQuery();
checkQuery(stats);
_querySupport->endQuery(state);
_querySupport->checkQuery(stats, state, _startTick);
}
osg::Timer_t afterDrawTick = osg::Timer::instance()->tick();