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/*
* For a description of the algorithm and the terms used, please see the
* documentation for this sample.
*
* On invocation of kernel blackScholes, each work thread calculates
* thread-histogram bin and finally all thread-histograms merged into
* block-histogram bin. Outside the kernel, All block-histograms merged
* into final histogram
*/
#define LINEAR_MEM_ACCESS
#pragma OPENCL EXTENSION cl_khr_byte_addressable_store : enable
/**
* @brief Calculates block-histogram bin whose bin size is 256
* @param data input data pointer
* @param sharedArray shared array for thread-histogram bins
* @param binResult block-histogram array
*/
__kernel
void histogram256(__global const uchar* data,
__local uchar* sharedArray,
__global uint* binResult,
uint binSize)
{
size_t localId = get_local_id(0);
size_t globalId = get_global_id(0);
size_t groupId = get_group_id(0);
size_t groupSize = get_local_size(0);
/* initialize shared array to zero */
for(int i = 0; i < binSize; ++i)
sharedArray[localId * binSize + i] = 0;
barrier(CLK_LOCAL_MEM_FENCE);
/* calculate thread-histograms */
for(int i = 0; i < binSize; ++i)
{
#ifdef LINEAR_MEM_ACCESS
uchar value = data[groupId * groupSize * binSize + i * groupSize + localId];
#else
uchar value = data[globalId * binSize + i];
#endif // LINEAR_MEM_ACCESS
sharedArray[localId * binSize + value]++;
}
barrier(CLK_LOCAL_MEM_FENCE);
/* merge all thread-histograms into block-histogram */
for(int i = 0; i < binSize / groupSize; ++i)
{
uint binCount = 0;
for(int j = 0; j < groupSize; ++j)
binCount += sharedArray[j * binSize + i * groupSize + localId];
binResult[groupId * binSize + i * groupSize + localId] = binCount;
}
}
__kernel
void bin256(__global uint* histo,
__global const uint* binResult,
uint subHistogramSize )
{
size_t j = get_local_id(0);
size_t binSize=get_global_size(0);
uint histValue=0;
for(int i = 0; i < subHistogramSize; ++i){
histValue += binResult[i * binSize + j];
}
histo[j]=histValue;
}
