private void EventConsumer()
{
while (!Disposed)
{
CounterQueueEvent evt = null;
lock (_lock)
{
if (_events.Count > 0)
{
evt = _events.Dequeue();
}
}
if (evt == null)
{
_queuedEvent.WaitOne(); // No more events to go through, wait for more.
}
else
{
// Spin-wait rather than sleeping if there are any waiters, by passing null instead of the wake signal.
evt.TryConsume(ref _accumulatedCounter, true, _waiterCount == 0 ? _wakeSignal : null);
}
if (_waiterCount > 0)
{
_eventConsumed.Set();
}
}
}
public void Dispose()
{
lock (_lock)
{
while (_events.Count > 0)
{
CounterQueueEvent evt = _events.Dequeue();
evt.Dispose();
}
Disposed = true;
}
_queuedEvent.Set();
_consumerThread.Join();
foreach (BufferedQuery query in _queryPool)
{
query.Dispose();
}
_queuedEvent.Dispose();
_wakeSignal.Dispose();
_eventConsumed.Dispose();
}
public CounterQueueEvent QueueReport(EventHandler <ulong> resultHandler, ulong lastDrawIndex)
{
CounterQueueEvent result;
ulong draws = lastDrawIndex - _current.DrawIndex;
lock (_lock)
{
// A query's result only matters if more than one draw was performed during it.
// Otherwise, dummy it out and return 0 immediately.
if (draws > 0)
{
_current.Complete(true);
_events.Enqueue(_current);
_current.OnResult += resultHandler;
}
else
{
_current.Complete(false);
_current.Dispose();
resultHandler(_current, 0);
}
result = _current;
_current = new CounterQueueEvent(this, GetTarget(Type), lastDrawIndex);
}
_queuedEvent.Set();
return(result);
}
public CounterQueueEvent QueueReport(EventHandler <ulong> resultHandler, ulong lastDrawIndex, bool hostReserved)
{
CounterQueueEvent result;
ulong draws = lastDrawIndex - _current.DrawIndex;
lock (_lock)
{
// A query's result only matters if more than one draw was performed during it.
// Otherwise, dummy it out and return 0 immediately.
if (hostReserved)
{
// This counter event is guaranteed to be available for host conditional rendering.
_current.ReserveForHostAccess();
}
_current.Complete(draws > 0);
_events.Enqueue(_current);
_current.OnResult += resultHandler;
result = _current;
_current = new CounterQueueEvent(this, GetTarget(Type), lastDrawIndex);
}
_queuedEvent.Set();
return(result);
}
public void FlushTo(CounterQueueEvent evt)
{
// Flush the counter queue on the main thread.
Interlocked.Increment(ref _waiterCount);
_wakeSignal.Set();
while (!evt.Disposed)
{
_eventConsumed.WaitOne(1);
}
Interlocked.Decrement(ref _waiterCount);
}
internal CounterQueue(CounterType type)
{
Type = type;
QueryTarget glType = GetTarget(Type);
_queryPool = new Queue <BufferedQuery>(QueryPoolInitialSize);
for (int i = 0; i < QueryPoolInitialSize; i++)
{
_queryPool.Enqueue(new BufferedQuery(glType));
}
_current = new CounterQueueEvent(this, glType, 0);
_consumerThread = new Thread(EventConsumer);
_consumerThread.Start();
}
public CounterQueueEvent QueueReport(EventHandler <ulong> resultHandler)
{
CounterQueueEvent result;
lock (_lock)
{
_current.Complete();
_events.Enqueue(_current);
result = _current;
result.OnResult += resultHandler;
_current = new CounterQueueEvent(this, GetTarget(Type));
}
_queuedEvent.Set();
return(result);
}
public void FlushTo(CounterQueueEvent evt)
{
lock (_lock)
{
if (evt.Disposed)
{
return;
}
// Tell the queue to process all events up to this one.
while (_events.Count > 0)
{
CounterQueueEvent flush = _events.Dequeue();
flush.TryConsume(ref _accumulatedCounter, true);
if (flush == evt)
{
return;
}
}
}
}
public void Flush(bool blocking)
{
if (!blocking)
{
// Just wake the consumer thread - it will update the queries.
_wakeSignal.Set();
return;
}
lock (_lock)
{
// Tell the queue to process all events.
while (_events.Count > 0)
{
CounterQueueEvent flush = _events.Peek();
if (!flush.TryConsume(ref _accumulatedCounter, true))
{
return; // If not blocking, then return when we encounter an event that is not ready yet.
}
_events.Dequeue();
}
}
}
private void EventConsumer()
{
while (!Disposed)
{
CounterQueueEvent evt = null;
lock (_lock)
{
if (_events.Count > 0)
{
evt = _events.Dequeue();
}
}
if (evt == null)
{
_queuedEvent.WaitOne(); // No more events to go through, wait for more.
}
else
{
evt.TryConsume(ref _accumulatedCounter, true, _wakeSignal);
}
}
}