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 /// @file
9 /// libCEED QFunctions for mass operator example using PETSc
10
11 #include <ceed/types.h>
12 #ifndef CEED_RUNNING_JIT_PASS
13 #include <math.h>
14 #endif
15
16 // -----------------------------------------------------------------------------
17 // This QFunction sets up the geometric factors required to apply the mass operator
18 //
19 // The quadrature data is stored in the array q_data.
20 //
21 // We require the determinant of the Jacobian to properly compute integrals of the form: int( u v )
22 //
23 // Qdata: det_J * w
24 //
25 // -----------------------------------------------------------------------------
SetupMassGeo(void * ctx,const CeedInt Q,const CeedScalar * const * in,CeedScalar * const * out)26 CEED_QFUNCTION(SetupMassGeo)(void *ctx, const CeedInt Q, const CeedScalar *const *in, CeedScalar *const *out) {
27 // Inputs
28 const CeedScalar(*J)[3][CEED_Q_VLA] = (const CeedScalar(*)[3][CEED_Q_VLA])in[1];
29 const CeedScalar(*w) = in[2]; // Note: *X = in[0]
30 // Outputs
31 CeedScalar *q_data = out[0];
32
33 const CeedInt dim = 3;
34 // Quadrature Point Loop
35 CeedPragmaSIMD for (CeedInt i = 0; i < Q; i++) {
36 // Setup
37 CeedScalar A[3][3];
38 for (CeedInt j = 0; j < dim; j++) {
39 for (CeedInt k = 0; k < dim; k++) {
40 // Equivalent code with no mod operations:
41 // A[k][j] = J[k+1][j+1]*J[k+2][j+2] - J[k+1][j+2]*J[k+2][j+1]
42 A[k][j] = J[(k + 1) % dim][(j + 1) % dim][i] * J[(k + 2) % dim][(j + 2) % dim][i] -
43 J[(k + 1) % dim][(j + 2) % dim][i] * J[(k + 2) % dim][(j + 1) % dim][i];
44 }
45 }
46 const CeedScalar detJ = J[0][0][i] * A[0][0] + J[0][1][i] * A[0][1] + J[0][2][i] * A[0][2];
47 q_data[i] = detJ * w[i];
48 } // End of Quadrature Point Loop
49 return 0;
50 }
51
52 // -----------------------------------------------------------------------------
53 // This QFunction sets up the rhs and true solution for the problem
54 // -----------------------------------------------------------------------------
SetupMassRhs(void * ctx,const CeedInt Q,const CeedScalar * const * in,CeedScalar * const * out)55 CEED_QFUNCTION(SetupMassRhs)(void *ctx, const CeedInt Q, const CeedScalar *const *in, CeedScalar *const *out) {
56 const CeedScalar *x = in[0], *w = in[1];
57 CeedScalar *true_soln = out[0], *rhs = out[1];
58
59 // Quadrature Point Loop
60 CeedPragmaSIMD for (CeedInt i = 0; i < Q; i++) {
61 true_soln[i] = sqrt(x[i] * x[i] + x[i + Q] * x[i + Q] + x[i + 2 * Q] * x[i + 2 * Q]);
62 rhs[i] = w[i] * true_soln[i];
63 } // End of Quadrature Point Loop
64 return 0;
65 }
66
67 // -----------------------------------------------------------------------------
68 // This QFunction applies the mass operator for a scalar field.
69 //
70 // Inputs:
71 // u - Input vector at quadrature points
72 // q_data - Geometric factors
73 //
74 // Output:
75 // v - Output vector (test functions) at quadrature points
76 // -----------------------------------------------------------------------------
Mass(void * ctx,const CeedInt Q,const CeedScalar * const * in,CeedScalar * const * out)77 CEED_QFUNCTION(Mass)(void *ctx, const CeedInt Q, const CeedScalar *const *in, CeedScalar *const *out) {
78 const CeedScalar *u = in[0], *q_data = in[1];
79 CeedScalar *v = out[0];
80
81 // Quadrature Point Loop
82 CeedPragmaSIMD for (CeedInt i = 0; i < Q; i++) v[i] = q_data[i] * u[i];
83
84 return 0;
85 }
86 // -----------------------------------------------------------------------------
87