lpt_wall_collision.c

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/*
 Copyright (c) 2026, The Neko Authors
 All rights reserved.
 
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 are met:
 
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     notice, this list of conditions and the following disclaimer.
 
   * Redistributions in binary form must reproduce the above
     copyright notice, this list of conditions and the following
     disclaimer in the documentation and/or other materials provided
     with the distribution.
 
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     contributors may be used to endorse or promote products derived
     from this software without specific prior written permission.
 
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 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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*/
 
#ifdef __APPLE__
#include <OpenCL/cl.h>
#else
#include <CL/cl.h>
#endif
 
#include <device/device_config.h>
#include <device/opencl/check.h>
#include <device/opencl/jit.h>
#include <device/opencl/prgm_lib.h>
 
#include "lpt_wall_collision_kernel.cl.h"
 
void opencl_lpt_handle_elastic_wall_collisions(
    void *wall_facet_mask, void *el_list,
    void *x_old, void *y_old, void *z_old,
    void *x, void *y, void *z,
    void *d, void *u, void *v, void *w,
    void *u_lag, void *v_lag, void *w_lag,
    void *u_laglag, void *v_laglag, void *w_laglag,
    void *acc_xlag, void *acc_ylag, void *acc_zlag,
    void *acc_xlaglag, void *acc_ylaglag, void *acc_zlaglag,
    void *u_old, void *v_old, void *w_old,
    void *acc_x, void *acc_y, void *acc_z,
    void *dm_x, void *dm_y, void *dm_z,
    void *nx, void *ny, void *nz,
    int *n, int *gdim, int *nelv,
    int *lx, int *ly, int *lz, int *lag_len, void *strm) {
  cl_int err;
 
  if (*n < 1) return;
 
  if (lpt_wall_collision_program == NULL) {
    opencl_kernel_jit(lpt_wall_collision_kernel,
                      (cl_program *) &lpt_wall_collision_program);
  }
 
  cl_kernel kernel =
    clCreateKernel(lpt_wall_collision_program,
                   "lpt_handle_elastic_wall_collisions_kernel", &err);
  CL_CHECK(err);
 
  void *bufs[36] = { wall_facet_mask, el_list,
                     x_old, y_old, z_old,
                     x, y, z,
                     d, u, v, w,
                     u_lag, v_lag, w_lag,
                     u_laglag, v_laglag, w_laglag,
                     acc_xlag, acc_ylag, acc_zlag,
                     acc_xlaglag, acc_ylaglag, acc_zlaglag,
                     u_old, v_old, w_old,
                     acc_x, acc_y, acc_z,
                     dm_x, dm_y, dm_z,
                     nx, ny, nz };
 
  /* The lag arrays are only read when lag_len allows it, but every slot
     still needs a valid memory object */
  for (int i = 0; i < 36; i++) {
    if (bufs[i] == NULL) bufs[i] = x;
  }
 
  for (int i = 0; i < 36; i++) {
    CL_CHECK(clSetKernelArg(kernel, i, sizeof(cl_mem), (void *) &bufs[i]));
  }
  CL_CHECK(clSetKernelArg(kernel, 36, sizeof(int), n));
  CL_CHECK(clSetKernelArg(kernel, 37, sizeof(int), gdim));
  CL_CHECK(clSetKernelArg(kernel, 38, sizeof(int), nelv));
  CL_CHECK(clSetKernelArg(kernel, 39, sizeof(int), lx));
  CL_CHECK(clSetKernelArg(kernel, 40, sizeof(int), ly));
  CL_CHECK(clSetKernelArg(kernel, 41, sizeof(int), lz));
  CL_CHECK(clSetKernelArg(kernel, 42, sizeof(int), lag_len));
 
  const int nb = ((*n) + 256 - 1) / 256;
  const size_t global_item_size = 256 * nb;
  const size_t local_item_size = 256;
 
  CL_CHECK(clEnqueueNDRangeKernel((cl_command_queue) strm, kernel,
                                  1, NULL, &global_item_size,
                                  &local_item_size, 0, NULL, NULL));
 
  CL_CHECK(clReleaseKernel(kernel));
}