/*
Bullet Continuous Collision Detection and Physics Library
Copyright (c) 2003-2007 Erwin Coumans  http://bulletphysics.com

This software is provided 'as-is', without any express or implied warranty.
In no event will the authors be held liable for any damages arising from the use of this software.
Permission is granted to anyone to use this software for any purpose, 
including commercial applications, and to alter it and redistribute it freely, 
subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/

#include "b3SequentialThreadSupport.h"



b3SequentialThreadSupport::b3SequentialThreadSupport(SequentialThreadConstructionInfo& threadConstructionInfo)
{
	startThreads(threadConstructionInfo);
}

///cleanup/shutdown Libspe2
b3SequentialThreadSupport::~b3SequentialThreadSupport()
{
	stopThreads();
}

#include <stdio.h>

///send messages to SPUs
void b3SequentialThreadSupport::sendRequest(int uiCommand, void* uiArgument0, int taskId)
{
	switch (uiCommand)
	{
	case 	B3_THREAD_SCHEDULE_TASK:
		{
			btSpuStatus&	spuStatus = m_activeSpuStatus[0];
			spuStatus.m_userPtr=(void*)uiArgument0;
			spuStatus.m_userThreadFunc(spuStatus.m_userPtr,spuStatus.m_lsMemory);
		}
	break;
	default:
		{
			///not implemented
			b3Assert(0 && "Not implemented");
		}

	};


}

///check for messages from SPUs
void b3SequentialThreadSupport::waitForResponse(unsigned int *puiArgument0, unsigned int *puiArgument1)
{
	b3Assert(m_activeSpuStatus.size());
	btSpuStatus& spuStatus = m_activeSpuStatus[0];
	*puiArgument0 = spuStatus.m_taskId;
	*puiArgument1 = spuStatus.m_status;
}

void b3SequentialThreadSupport::startThreads(SequentialThreadConstructionInfo& threadConstructionInfo)
{
	m_activeSpuStatus.resize(1);
	printf("STS: Not starting any threads\n");
	btSpuStatus& spuStatus = m_activeSpuStatus[0];
	spuStatus.m_userPtr = 0;
	spuStatus.m_taskId = 0;
	spuStatus.m_commandId = 0;
	spuStatus.m_status = 0;
	spuStatus.m_lsMemory = threadConstructionInfo.m_lsMemoryFunc();
	spuStatus.m_userThreadFunc = threadConstructionInfo.m_userThreadFunc;
	printf("STS: Created local store at %p for task %s\n", spuStatus.m_lsMemory, threadConstructionInfo.m_uniqueName);
}

void b3SequentialThreadSupport::startThreads()
{
}

void b3SequentialThreadSupport::stopThreads()
{
	m_activeSpuStatus.clear();
}

void b3SequentialThreadSupport::setNumTasks(int numTasks)
{
	printf("b3SequentialThreadSupport::setNumTasks(%d) is not implemented and has no effect\n",numTasks);
}




class btDummyBarrier : public b3Barrier
{
private:
		
public:
	btDummyBarrier()
	{
	}
	
	virtual ~btDummyBarrier()
	{
	}
	
	void sync()
	{
	}
	
	virtual void setMaxCount(int n) {}
	virtual int  getMaxCount() {return 1;}
};

class btDummyCriticalSection : public b3CriticalSection
{
	
public:
	btDummyCriticalSection()
	{
	}
	
	virtual ~btDummyCriticalSection()
	{
	}
	
	unsigned int getSharedParam(int i)
	{
		b3Assert(i>=0&&i<31);
		return mCommonBuff[i+1];
	}
	
	void setSharedParam(int i,unsigned int p)
	{
		b3Assert(i>=0&&i<31);
		mCommonBuff[i+1] = p;
	}
	
	void lock()
	{
		mCommonBuff[0] = 1;
	}
	
	void unlock()
	{
		mCommonBuff[0] = 0;
	}
};




b3Barrier*	b3SequentialThreadSupport::createBarrier()
{
	return new btDummyBarrier();
}

b3CriticalSection* b3SequentialThreadSupport::createCriticalSection()
{
	return new btDummyCriticalSection();
	
}

void b3SequentialThreadSupport::deleteBarrier(b3Barrier* barrier)
{
    delete barrier;
}

void b3SequentialThreadSupport::deleteCriticalSection(b3CriticalSection* criticalSection)
{
    delete criticalSection;
}