void sort(vex::vector<T> &x) {
auto queue = x.queue_list();
for(unsigned d = 0; d < queue.size(); ++d) {
if (x.part_size(d)) {
boost::compute::command_queue q( queue[d]() );
boost::compute::buffer buf( x(d).raw() );
boost::compute::sort(
boost::compute::make_buffer_iterator<T>(buf, 0),
boost::compute::make_buffer_iterator<T>(buf, x.part_size(d)),
q
);
}
}
if (queue.size() > 1) {
// Get sorted partitions to host side and do multiway merge sort.
std::vector<T> src(x.size()), dst(x.size());
vex::copy(x, src);
std::vector< typename std::vector<T>::const_iterator > begin(queue.size());
std::vector< typename std::vector<T>::const_iterator > end (queue.size());
for(unsigned d = 0; d < queue.size(); ++d) {
begin[d] = src.begin() + x.part_start(d);
end [d] = src.begin() + x.part_start(d + 1);
}
for(auto pos = dst.begin(); pos != dst.end(); ++pos) {
int winner = -1;
for(unsigned d = 0; d < queue.size(); ++d) {
if (begin[d] == end[d])
continue;
if (winner < 0 || *begin[d] < *begin[winner])
winner = d;
}
*pos = *begin[winner]++;
}
vex::copy(dst, x);
}
}
static bool same_size( const vex::vector< T > &x1 , const vex::vector< T > &x2 )
{
return x1.size() == x2.size();
}
static void resize( vex::vector< T > &x1 , const vex::vector< T > &x2 )
{
x1.resize( x2.queue_list() , x2.size() );
}