// Copyright (c) 2017-2026, Lawrence Livermore National Security, LLC and other CEED contributors.
// All Rights Reserved. See the top-level LICENSE and NOTICE files for details.
//
// SPDX-License-Identifier: BSD-2-Clause
//
// This file is part of CEED:  http://github.com/ceed

/**
  @brief Ceed QFunction for applying the 1D Poisson operator on a vector system with three components
**/
#include <ceed/types.h>

CEED_QFUNCTION(Vector3Poisson1DApply)(void *ctx, const CeedInt Q, const CeedScalar *const *in, CeedScalar *const *out) {
  // in[0] is gradient u, shape [1, nc=3, Q]
  // in[1] is quadrature data, size (Q)
  const CeedScalar(*ug)[CEED_Q_VLA] = (const CeedScalar(*)[CEED_Q_VLA])in[0], (*q_data) = in[1];
  // out[0] is output to multiply against gradient v, shape [1, nc=3, Q]
  CeedScalar(*vg)[CEED_Q_VLA] = (CeedScalar(*)[CEED_Q_VLA])out[0];

  const CeedInt num_comp = 3;

  // Quadrature point loop
  CeedPragmaSIMD for (CeedInt i = 0; i < Q; i++) {
    for (CeedInt c = 0; c < num_comp; c++) {
      vg[c][i] = ug[c][i] * q_data[i];
    }
  }  // End of Quadrature Point Loop
  return CEED_ERROR_SUCCESS;
}