xref: /libCEED/examples/petsc/qfunctions/swarm/swarmmass.h (revision 9ba83ac0e4b1fca39d6fa6737a318a9f0cbc172d)
1 // Copyright (c) 2017-2026, Lawrence Livermore National Security, LLC and other CEED contributors.
2 // All Rights Reserved. See the top-level LICENSE and NOTICE files for details.
3 //
4 // SPDX-License-Identifier: BSD-2-Clause
5 //
6 // This file is part of CEED:  http://github.com/ceed
7 
8 #include <ceed/types.h>
9 
10 CEED_QFUNCTION(SetupMass)(void *ctx, const CeedInt Q, const CeedScalar *const *in, CeedScalar *const *out) {
11   const CeedScalar(*J)[3][CEED_Q_VLA] = (const CeedScalar(*)[3][CEED_Q_VLA])in[0];
12   const CeedScalar *w                 = in[1];
13   CeedScalar       *q_data            = out[0];
14 
15   // Quadrature point loop
16   CeedPragmaSIMD for (CeedInt i = 0; i < Q; i++) {
17     const CeedScalar B11 = J[1][1][i] * J[2][2][i] - J[1][2][i] * J[2][1][i];
18     const CeedScalar B12 = J[0][2][i] * J[2][1][i] - J[0][1][i] * J[2][2][i];
19     const CeedScalar B13 = J[0][1][i] * J[1][2][i] - J[0][2][i] * J[1][1][i];
20 
21     q_data[i] = w[i] * (J[0][0][i] * B11 + J[1][0][i] * B12 + J[2][0][i] * B13);
22   }
23   return 0;
24 }
25 
26 CEED_QFUNCTION(Mass)(void *ctx, const CeedInt Q, const CeedScalar *const *in, CeedScalar *const *out) {
27   const CeedScalar *rho            = (const CeedScalar *)in[0];
28   const CeedScalar(*u)[CEED_Q_VLA] = (const CeedScalar(*)[CEED_Q_VLA])in[1];
29   CeedScalar(*v)[CEED_Q_VLA]       = (CeedScalar(*)[CEED_Q_VLA])out[0];
30 
31   const CeedInt num_comp = *(CeedInt *)ctx;
32   // Quadrature point loop
33   CeedPragmaSIMD for (CeedInt i = 0; i < Q; i++) {
34     for (CeedInt j = 0; j < num_comp; j++) v[j][i] = rho[i] * u[j][i];
35   }
36   return 0;
37 }
38