Added multi-threaded collision detection. Original code is written for Cell SPU, but wrappers are provided to run on multi-core using Win32 Threads.
SpuLibspe2Support is on the todo list, so it can run on Cell Blade & PS3 Linux.
This commit is contained in:
ejcoumans
226
Extras/BulletMultiThreaded/Win32ThreadSupport.cpp
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226
Extras/BulletMultiThreaded/Win32ThreadSupport.cpp
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/*
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Bullet Continuous Collision Detection and Physics Library
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Copyright (c) 2003-2007 Erwin Coumans http://bulletphysics.com
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This software is provided 'as-is', without any express or implied warranty.
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In no event will the authors be held liable for any damages arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it freely,
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subject to the following restrictions:
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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.
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2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "Win32ThreadSupport.h"
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#ifdef USE_WIN32_THREADING
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#include "SpuCollisionTaskProcess.h"
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#include "SpuNarrowPhaseCollisionTask/SpuGatheringCollisionTask.h"
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#include <Windows.h>
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///Win32ThreadSupport helps to initialize/shutdown libspe2, start/stop SPU tasks and communication
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///Setup and initialize SPU/CELL/Libspe2
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Win32ThreadSupport::Win32ThreadSupport(Win32ThreadConstructionInfo& threadConstructionInfo)
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{
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startSPUs(threadConstructionInfo);
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}
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///cleanup/shutdown Libspe2
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Win32ThreadSupport::~Win32ThreadSupport()
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{
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stopSPUs();
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}
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#include <stdio.h>
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DWORD WINAPI Thread_no_1( LPVOID lpParam )
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{
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btSpuStatus* status = (btSpuStatus*)lpParam;
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while (1)
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{
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WaitForSingleObject(status->m_eventStartHandle,INFINITE);
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btAssert(status->m_status);
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void* userPtr = status->m_userPtr;
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if (userPtr)
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{
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status->m_userThreadFunc(userPtr,status->m_lsMemory);
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SetEvent(status->m_eventCompletetHandle);
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} else
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{
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//exit Thread
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break;
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}
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}
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return 0;
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}
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///send messages to SPUs
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void Win32ThreadSupport::sendRequest(uint32_t uiCommand, uint32_t uiArgument0, uint32_t taskId)
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{
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/// gMidphaseSPU.sendRequest(CMD_GATHER_AND_PROCESS_PAIRLIST, (uint32_t) &taskDesc);
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///we should spawn an SPU task here, and in 'waitForResponse' it should wait for response of the (one of) the first tasks that finished
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switch (uiCommand)
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{
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case CMD_GATHER_AND_PROCESS_PAIRLIST:
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{
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//#define SINGLE_THREADED 1
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#ifdef SINGLE_THREADED
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btSpuStatus& spuStatus = m_activeSpuStatus[0];
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spuStatus.m_userPtr=(void*)uiArgument0;
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spuStatus.m_userThreadFunc(spuStatus.m_userPtr,spuStatus.m_lsMemory);
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HANDLE handle =0;
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#else
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btSpuStatus& spuStatus = m_activeSpuStatus[taskId];
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btAssert(taskId>=0);
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btAssert(taskId<m_activeSpuStatus.size());
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spuStatus.m_commandId = uiCommand;
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spuStatus.m_status = 1;
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spuStatus.m_userPtr = (void*)uiArgument0;
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///fire event to start new task
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SetEvent(spuStatus.m_eventStartHandle);
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#endif //CollisionTask_LocalStoreMemory
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break;
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}
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default:
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{
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///not implemented
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btAssert(0);
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}
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};
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}
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///check for messages from SPUs
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void Win32ThreadSupport::waitForResponse(unsigned int *puiArgument0, unsigned int *puiArgument1)
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{
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///We should wait for (one of) the first tasks to finish (or other SPU messages), and report its response
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///A possible response can be 'yes, SPU handled it', or 'no, please do a PPU fallback'
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btAssert(m_activeSpuStatus.size());
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int last = -1;
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//find an active spu/thread
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for (int i=0;i<m_activeSpuStatus.size();i++)
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{
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if (m_activeSpuStatus[i].m_status)
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{
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last = i;
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break;
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}
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}
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#ifndef SINGLE_THREADED
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btSpuStatus& spuStatus = m_activeSpuStatus[last];
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btAssert(spuStatus.m_threadHandle);
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btAssert(spuStatus.m_eventCompletetHandle);
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WaitForSingleObject(spuStatus.m_eventCompletetHandle, INFINITE);
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spuStatus.m_status = 0;
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///need to find an active spu
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btAssert(last>=0);
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#else
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last=0;
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btSpuStatus& spuStatus = m_activeSpuStatus[last];
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#endif //SINGLE_THREADED
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*puiArgument0 = spuStatus.m_taskId;
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*puiArgument1 = spuStatus.m_status;
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}
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///start the spus group (can be called at the beginning of each frame, to make sure that the right SPU program is loaded)
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void Win32ThreadSupport::startSPUs(Win32ThreadConstructionInfo& threadConstructionInfo)
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{
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m_activeSpuStatus.resize(threadConstructionInfo.m_numThreads);
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for (int i=0;i<threadConstructionInfo.m_numThreads;i++)
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{
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printf("starting thread %d\n",i);
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btSpuStatus& spuStatus = m_activeSpuStatus[i];
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LPSECURITY_ATTRIBUTES lpThreadAttributes=NULL;
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SIZE_T dwStackSize=threadConstructionInfo.m_threadStackSize;
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LPTHREAD_START_ROUTINE lpStartAddress=&Thread_no_1;
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LPVOID lpParameter=&spuStatus;
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DWORD dwCreationFlags=0;
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LPDWORD lpThreadId=0;
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spuStatus.m_userPtr=0;
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sprintf(spuStatus.m_eventStartHandleName,"eventStart%s%d",threadConstructionInfo.m_uniqueName,i);
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spuStatus.m_eventStartHandle = CreateEvent(0,false,false,spuStatus.m_eventStartHandleName);
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sprintf(spuStatus.m_eventCompletetHandleName,"eventComplete%s%d",threadConstructionInfo.m_uniqueName,i);
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spuStatus.m_eventCompletetHandle = CreateEvent(0,false,false,spuStatus.m_eventCompletetHandleName);
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HANDLE handle = CreateThread(lpThreadAttributes,dwStackSize,lpStartAddress,lpParameter, dwCreationFlags,lpThreadId);
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SetThreadPriority(handle,THREAD_PRIORITY_TIME_CRITICAL);
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spuStatus.m_taskId = i;
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spuStatus.m_commandId = 0;
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spuStatus.m_status = 0;
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spuStatus.m_threadHandle = handle;
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spuStatus.m_lsMemory = threadConstructionInfo.m_lsMemoryFunc();
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spuStatus.m_userThreadFunc = threadConstructionInfo.m_userThreadFunc;
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printf("started thread %d with threadHandle %d\n",i,handle);
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}
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}
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///tell the task scheduler we are done with the SPU tasks
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void Win32ThreadSupport::stopSPUs()
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{
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// m_activeSpuStatus.pop_back();
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// WaitForSingleObject(spuStatus.bla, INFINITE);
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// CloseHandle(spuStatus.m_threadHandle);
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}
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#endif //USE_WIN32_THREADING
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