genesis-3d_engine/Engine/foundation/framesync/framesynchandlerthread.h

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/****************************************************************************
Copyright (c) 2009, Radon Labs GmbH
Copyright (c) 2011-2013,WebJet Business Division,CYOU
http://www.genesis-3d.com.cn
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/
#pragma once
//------------------------------------------------------------------------------
/**
@class FrameSync::FrameSyncHandlerThread
A special handler thread class for synchronizing the render thread and
the game thread (and possibly other threads which need to run in
lock-step with the render thread).
The FrameSyncHandlerThread object implements a clearly defined sync point
which separates the previous frame from the next frame for all
participating threads:
- all threads arrive at the frame sync point and wait for the arrival
of the other threads
- once all threads have arrived:
- advance the master time
- flip message queues
- start all threads
*/
#include "core/singleton.h"
#include "messaging/handlerthreadbase.h"
#include "timing/timer.h"
#include "threading/threadbarrier.h"
#include "threading/safequeue.h"
#include "threading/criticalsection.h"
//------------------------------------------------------------------------------
namespace FrameSync
{
class FrameSyncHandlerThread : public Messaging::HandlerThreadBase
{
__DeclareClass(FrameSyncHandlerThread);
__DeclareImageSingleton(FrameSyncHandlerThread);
public:
static const SizeT NumSyncThreads = 2; // render thread and main thread
/// constructor
FrameSyncHandlerThread();
/// destructor
virtual ~FrameSyncHandlerThread();
/// enter lock-step mode
void EnterLockStepMode();
/// leave lock-step mode
void LeaveLockStepMode();
/// return true if currently in lock-step mode
bool LockStepModeActive() const;
/// get the current frame count (also available on FrameSyncTimer)
IndexT GetFrameCount() const;
/// start fixed frame time mode
void StartFixedFrameTime(Timing::Time frameTime);
/// stop fixed frame time mode
void StopFixedFrameTime();
/// check whether the fixed frame time mode is currently active
bool IsFixedFrameTime();
/// notify arrival at sync point
void ArriveAtSyncPoint(bool masterThread);
/// add a message to be handled
virtual void AddMessage(const GPtr<Messaging::Message>& msg);
/// cancel a pending message
virtual void CancelMessage(const GPtr<Messaging::Message>& msg);
/// wait for message to be handled
virtual void WaitForMessage(const GPtr<Messaging::Message>& msg);
/// this method runs in the thread context
virtual void DoWork();
private:
friend class FrameSyncTimer;
/// start the master time (SLOW!)
void StartMasterTime();
/// stop the master time (SLOW!)
void StopMasterTime();
/// reset the master time (SLOW!)
void ResetMasterTime();
/// return true if time is running (SLOW!)
bool IsMasterTimeRunning() const;
/// safely get the current frame time (SLOW!)
Timing::Time SafeGetMasterTime() const;
/// update the time (called during sync point)
void SyncUpdateTime();
/// update the thread-local FrameSyncTimer singleton
void SyncUpdateThreadLocalFrameSyncTimer();
/// flip message queues
void SyncFlipMessageQueue();
volatile int lockStepMode;
volatile int frameCount;
volatile int fixedFrameTimeMode;
Threading::ThreadBarrier threadBarrier;
Threading::Event frameSyncEvent;
Threading::CriticalSection frameCritSect;
Timing::Timer masterTimer;
Timing::Time curTime;
Timing::Time fixedFrameTime;
Timing::Time realTime;
Threading::SafeQueue<GPtr<Messaging::Message> > msgQueue; // incoming messages
Util::Array<GPtr<Messaging::Message> > msgArray; // processed messages
};
//------------------------------------------------------------------------------
/**
*/
inline bool
FrameSyncHandlerThread::LockStepModeActive() const
{
return (0 != this->lockStepMode);
}
//------------------------------------------------------------------------------
/**
*/
inline SizeT
FrameSyncHandlerThread::GetFrameCount() const
{
// incremented through interlocked function, no need for crit sect
return this->frameCount;
}
//------------------------------------------------------------------------------
/**
*/
inline bool
FrameSyncHandlerThread::IsFixedFrameTime()
{
return (0 != this->fixedFrameTimeMode);
}
} // namespace FrameSync
//------------------------------------------------------------------------------