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#include "b3PrefixScanFloat4CL.h"
#include "b3FillCL.h"
#define B3_PREFIXSCAN_FLOAT4_PROG_PATH "src/Bullet3OpenCL/ParallelPrimitives/kernels/PrefixScanFloat4Kernels.cl"
#include "b3LauncherCL.h"
#include "Bullet3OpenCL/Initialize/b3OpenCLUtils.h"
#include "kernels/PrefixScanKernelsFloat4CL.h"
b3PrefixScanFloat4CL::b3PrefixScanFloat4CL(cl_context ctx, cl_device_id device, cl_command_queue queue, int size)
: m_commandQueue(queue)
{
const char* scanKernelSource = prefixScanKernelsFloat4CL;
cl_int pErrNum;
char* additionalMacros = 0;
m_workBuffer = new b3OpenCLArray<b3Vector3>(ctx, queue, size);
cl_program scanProg = b3OpenCLUtils::compileCLProgramFromString(ctx, device, scanKernelSource, &pErrNum, additionalMacros, B3_PREFIXSCAN_FLOAT4_PROG_PATH);
b3Assert(scanProg);
m_localScanKernel = b3OpenCLUtils::compileCLKernelFromString(ctx, device, scanKernelSource, "LocalScanKernel", &pErrNum, scanProg, additionalMacros);
b3Assert(m_localScanKernel);
m_blockSumKernel = b3OpenCLUtils::compileCLKernelFromString(ctx, device, scanKernelSource, "TopLevelScanKernel", &pErrNum, scanProg, additionalMacros);
b3Assert(m_blockSumKernel);
m_propagationKernel = b3OpenCLUtils::compileCLKernelFromString(ctx, device, scanKernelSource, "AddOffsetKernel", &pErrNum, scanProg, additionalMacros);
b3Assert(m_propagationKernel);
}
b3PrefixScanFloat4CL::~b3PrefixScanFloat4CL()
{
delete m_workBuffer;
clReleaseKernel(m_localScanKernel);
clReleaseKernel(m_blockSumKernel);
clReleaseKernel(m_propagationKernel);
}
template <class T>
T b3NextPowerOf2(T n)
{
n -= 1;
for (int i = 0; i < sizeof(T) * 8; i++)
n = n | (n >> i);
return n + 1;
}
void b3PrefixScanFloat4CL::execute(b3OpenCLArray<b3Vector3>& src, b3OpenCLArray<b3Vector3>& dst, int n, b3Vector3* sum)
{
// b3Assert( data->m_option == EXCLUSIVE );
const unsigned int numBlocks = (const unsigned int)((n + BLOCK_SIZE * 2 - 1) / (BLOCK_SIZE * 2));
dst.resize(src.size());
m_workBuffer->resize(src.size());
b3Int4 constBuffer;
constBuffer.x = n;
constBuffer.y = numBlocks;
constBuffer.z = (int)b3NextPowerOf2(numBlocks);
b3OpenCLArray<b3Vector3>* srcNative = &src;
b3OpenCLArray<b3Vector3>* dstNative = &dst;
{
b3BufferInfoCL bInfo[] = {b3BufferInfoCL(dstNative->getBufferCL()), b3BufferInfoCL(srcNative->getBufferCL()), b3BufferInfoCL(m_workBuffer->getBufferCL())};
b3LauncherCL launcher(m_commandQueue, m_localScanKernel, "m_localScanKernel");
launcher.setBuffers(bInfo, sizeof(bInfo) / sizeof(b3BufferInfoCL));
launcher.setConst(constBuffer);
launcher.launch1D(numBlocks * BLOCK_SIZE, BLOCK_SIZE);
}
{
b3BufferInfoCL bInfo[] = {b3BufferInfoCL(m_workBuffer->getBufferCL())};
b3LauncherCL launcher(m_commandQueue, m_blockSumKernel, "m_blockSumKernel");
launcher.setBuffers(bInfo, sizeof(bInfo) / sizeof(b3BufferInfoCL));
launcher.setConst(constBuffer);
launcher.launch1D(BLOCK_SIZE, BLOCK_SIZE);
}
if (numBlocks > 1)
{
b3BufferInfoCL bInfo[] = {b3BufferInfoCL(dstNative->getBufferCL()), b3BufferInfoCL(m_workBuffer->getBufferCL())};
b3LauncherCL launcher(m_commandQueue, m_propagationKernel, "m_propagationKernel");
launcher.setBuffers(bInfo, sizeof(bInfo) / sizeof(b3BufferInfoCL));
launcher.setConst(constBuffer);
launcher.launch1D((numBlocks - 1) * BLOCK_SIZE, BLOCK_SIZE);
}
if (sum)
{
clFinish(m_commandQueue);
dstNative->copyToHostPointer(sum, 1, n - 1, true);
}
}
void b3PrefixScanFloat4CL::executeHost(b3AlignedObjectArray<b3Vector3>& src, b3AlignedObjectArray<b3Vector3>& dst, int n, b3Vector3* sum)
{
b3Vector3 s = b3MakeVector3(0, 0, 0);
//if( data->m_option == EXCLUSIVE )
{
for (int i = 0; i < n; i++)
{
dst[i] = s;
s += src[i];
}
}
/*else
{
for(int i=0; i<n; i++)
{
s += hSrc[i];
hDst[i] = s;
}
}
*/
if (sum)
{
*sum = dst[n - 1];
}
}
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