/*
batch version of ball query, modified from the original implementation of official PointNet++ codes.
Written by Shaoshuai Shi
All Rights Reserved 2018.
*/


#include <torch/serialize/tensor.h>
#include <vector>
#include <THC/THC.h>
#include <cuda.h>
#include <cuda_runtime_api.h>
#include "ball_query_gpu.h"

extern THCState *state;

#define CHECK_CUDA(x) AT_CHECK(x.type().is_cuda(), #x, " must be a CUDAtensor ")
#define CHECK_CONTIGUOUS(x) AT_CHECK(x.is_contiguous(), #x, " must be contiguous ")
#define CHECK_INPUT(x) CHECK_CUDA(x);CHECK_CONTIGUOUS(x)

int ball_query_wrapper_fast(int b, int n, int m, float radius, int nsample, 
    at::Tensor new_xyz_tensor, at::Tensor xyz_tensor, at::Tensor idx_tensor) {
    CHECK_INPUT(new_xyz_tensor);
    CHECK_INPUT(xyz_tensor);
    const float *new_xyz = new_xyz_tensor.data<float>();
    const float *xyz = xyz_tensor.data<float>();
    int *idx = idx_tensor.data<int>();
    
    cudaStream_t stream = THCState_getCurrentStream(state);
    ball_query_kernel_launcher_fast(b, n, m, radius, nsample, new_xyz, xyz, idx, stream);
    return 1;
}