/*
Stacked-batch-data version of point grouping, modified from the original implementation of official PointNet++ codes.
Written by Shaoshuai Shi
All Rights Reserved 2019-2020.
*/


#ifndef _STACK_GROUP_POINTS_GPU_H
#define _STACK_GROUP_POINTS_GPU_H

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


int group_points_wrapper_stack(int B, int M, int C, int nsample,
    at::Tensor features_tensor, at::Tensor features_batch_cnt_tensor,
    at::Tensor idx_tensor, at::Tensor idx_batch_cnt_tensor, at::Tensor out_tensor);

void group_points_kernel_launcher_stack(int B, int M, int C, int nsample,
    const float *features, const int *features_batch_cnt, const int *idx, const int *idx_batch_cnt, float *out);

int group_points_grad_wrapper_stack(int B, int M, int C, int N, int nsample,
    at::Tensor grad_out_tensor, at::Tensor idx_tensor, at::Tensor idx_batch_cnt_tensor,
    at::Tensor features_batch_cnt_tensor, at::Tensor grad_features_tensor);

void group_points_grad_kernel_launcher_stack(int B, int M, int C, int N, int nsample,
    const float *grad_out, const int *idx, const int *idx_batch_cnt, const int *features_batch_cnt, float *grad_features);

#endif