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rotation_kernels.cu
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rotation_kernels.cu
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#include "headers.h"
#include "config.h"
#include "stdio.h"
__global__ void kernel_rotation(uchar *in, uchar *out,uint width, uint height,uint pxl_p_thd,float norm)
{
int x = blockIdx.x*BATCH_W + threadIdx.x;
int y = blockIdx.y*BATCH_H + threadIdx.y;
if(y < height)
{
for(int ix = x; ix < width; ix += blockDim.x)
{
out[y + ix * height] = in[ix + y * width];
}
}
}
__global__ void kernel_rotation_shared(uchar *in, uchar *out,uint width, uint height,uint pxl_p_thd,float norm)
{
int x = blockIdx.x*BATCH_W + threadIdx.x;
int y = blockIdx.y*BATCH_H + threadIdx.y;
__shared__ uchar tile[BATCH_H][BATCH_W+1];
int idx_in = x + y*width;
x = blockIdx.y * BATCH_H + threadIdx.x;
y = blockIdx.x * BATCH_W + threadIdx.y;
int idx_out = x + y*height;
for (int i=0; i<BATCH_H; i+=pxl_p_thd)
{
tile[threadIdx.y+i][threadIdx.x] = in[idx_in+i*width];
}
__syncthreads();
for (int i=0; i<BATCH_W; i+=pxl_p_thd)
{
out[idx_out+i*height] = tile[threadIdx.x][threadIdx.y+i];
}
}
void rotation_global_mem(uchar* in, uchar* out,size_t width, size_t height)
{
exec_kernel(in,out,width,height,kernel_rotation);
}
void rotation_shared_mem(uchar* in, uchar* out,size_t width, size_t height)
{
exec_kernel(in,out,width,height,kernel_rotation_shared);
}