vortex/tests/opencl/nearn/kernel.cl

//#pragma OPENCL EXTENSION cl_khr_byte_addressable_store : enable

typedef struct latLong
    {
        float lat;
        float lng;
    } LatLong;

__kernel void NearestNeighbor(__global LatLong *d_locations,
							  __global float *d_distances,
							  const int numRecords,
							  const float lat,
							  const float lng) {
	 int globalId = get_global_id(0);
							  
     if (globalId < numRecords) {
         __global LatLong *latLong = d_locations+globalId;
    
         __global float *dist=d_distances+globalId;
         *dist = (float)sqrt((lat-latLong->lat)*(lat-latLong->lat)+(lng-latLong->lng)*(lng-latLong->lng));
	 }
}