device.hpp

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#ifndef PCL_GPU_KINFU_DEVICE_HPP_
#define PCL_GPU_KINFU_DEVICE_HPP_
 
#include "utils.hpp" //temporary reimplementing to release kinfu without pcl_gpu_utils
 
#include "internal.h"
 
namespace pcl
{
  namespace device
  {   
    #define INV_DIV 3.051850947599719e-5f
 
    __device__ __forceinline__ void
    pack_tsdf (float tsdf, int weight, short2& value)
    {
      int fixedp = max (-DIVISOR, min (DIVISOR, __float2int_rz (tsdf * DIVISOR)));
      //int fixedp = __float2int_rz(tsdf * DIVISOR);
      value = make_short2 (fixedp, weight);
    }
 
    __device__ __forceinline__ void
    unpack_tsdf (short2 value, float& tsdf, int& weight)
    {
      weight = value.y;
      tsdf = __int2float_rn (value.x) / DIVISOR;   //*/ * INV_DIV;
    }
 
    __device__ __forceinline__ float
    unpack_tsdf (short2 value)
    {
      return static_cast<float>(value.x) / DIVISOR;    //*/ * INV_DIV;
    }
 
 
    __device__ __forceinline__ float3
    operator* (const Mat33& m, const float3& vec)
    {
      return make_float3 (dot (m.data[0], vec), dot (m.data[1], vec), dot (m.data[2], vec));
    }
 
 
    ////////////////////////////////////////////////////////////////////////////////////////
    ///// Prefix Scan utility
 
    enum ScanKind { exclusive, inclusive };
 
    template<ScanKind Kind, class T>
    __device__ __forceinline__ T
    scan_warp ( volatile T *ptr, const unsigned int idx = threadIdx.x )
    {
      const unsigned int lane = idx & 31;       // index of thread in warp (0..31) 
 
      if (lane >=  1) ptr[idx] = ptr[idx -  1] + ptr[idx];
      if (lane >=  2) ptr[idx] = ptr[idx -  2] + ptr[idx];
      if (lane >=  4) ptr[idx] = ptr[idx -  4] + ptr[idx];
      if (lane >=  8) ptr[idx] = ptr[idx -  8] + ptr[idx];
      if (lane >= 16) ptr[idx] = ptr[idx - 16] + ptr[idx];
 
      if (Kind == inclusive)
        return ptr[idx];
      else
        return (lane > 0) ? ptr[idx - 1] : 0;
    }
  }
}
 
#endif /* PCL_GPU_KINFU_DEVICE_HPP_ */