#include <common.h>

__kernel void space_to_batch(OUT_OF_RANGE_PARAMS
                             GLOBAL_WORK_GROUP_SIZE_DIM3
                             __read_only image2d_t space_data,
                             __write_only image2d_t batch_data,
                             __private const int block_height,
                             __private const int block_width,
                             __private const int padding_height,
                             __private const int padding_width,
                             __private const int batch_size,
                             __private const int space_height,
                             __private const int space_width,
                             __private const int batch_height,
                             __private const int batch_width) {
  const int chan_idx = get_global_id(0);
  const int batch_w_idx = get_global_id(1);
  const int batch_hb_idx = get_global_id(2);

#ifndef NON_UNIFORM_WORK_GROUP
  if (chan_idx >= global_size_dim0 || batch_w_idx >= global_size_dim1
      || batch_hb_idx >= global_size_dim2) {
    return;
  }
#endif

  const int batch_b_idx = batch_hb_idx / batch_height;
  const int batch_h_idx = batch_hb_idx % batch_height;

  const int block_size = mul24(block_height, block_width);
  const int space_b_idx = batch_b_idx % batch_size;
  const int remaining_batch_idx = batch_b_idx / batch_size;
  const int space_h_idx = (remaining_batch_idx / block_width) +
      mul24(batch_h_idx, block_height) - padding_height;
  const int space_w_idx = (remaining_batch_idx % block_width) +
      mul24(batch_w_idx, block_width) - padding_width;

  const int space_coord_x = select(mul24(chan_idx, space_width) + space_w_idx,
                                   -1,
                                   space_w_idx < 0 || space_w_idx >= space_width);
  const int space_coord_y = select(mul24(space_b_idx, space_height) + space_h_idx,
                                   -1,
                                   space_h_idx < 0 || space_h_idx >= space_height);
  int2 space_coord = (int2)(space_coord_x,
                            space_coord_y);
  DATA_TYPE4 value = READ_IMAGET(space_data, SAMPLER, space_coord);

  int2 batch_coord = (int2)(mul24(chan_idx, batch_width) + batch_w_idx, batch_hb_idx);

  WRITE_IMAGET(batch_data, batch_coord, value);
}
