packing.h

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#pragma once

#include <cugar/bvh/bvh.h>
#include <thrust/transform.h>
#include <thrust/tuple.h>

namespace cugar {
namespace cuda {

struct bvh_packing_functor
{
    typedef Bbox4f                         result_type;
    typedef thrust::tuple<Bbox4f,Bvh_node> argument_type;

    CUGAR_HOST_DEVICE Bbox4f operator() (const argument_type arg) const
    {
        Bbox4f bbox = thrust::get<0>(arg);
        bbox[0][3] = binary_cast<float>( thrust::get<1>(arg).m_packed_data );
        bbox[1][3] = binary_cast<float>( thrust::get<1>(arg).m_skip_node );
        return bbox;
    }
};

template <typename Node_iterator, typename Bbox_iterator, typename Output_iterator>
void pack(
    const uint32    n_nodes,
    Node_iterator   nodes,
    Bbox_iterator   bboxes,
    Output_iterator packed_nodes)
{
    thrust::transform(
        thrust::make_zip_iterator(thrust::make_tuple(bboxes,nodes)),
        thrust::make_zip_iterator(thrust::make_tuple(bboxes,nodes)) + n_nodes,
        packed_nodes,
        bvh_packing_functor() );
}

} // namespace cuda
} // namespace cugar