xref: /libCEED/include/ceed.h (revision 89c6efa49859cd40e0a2f99b4a91b922f3b4c9b2) !
1 // Copyright (c) 2017, Lawrence Livermore National Security, LLC. Produced at
2 // the Lawrence Livermore National Laboratory. LLNL-CODE-734707. All Rights
3 // reserved. See files LICENSE and NOTICE for details.
4 //
5 // This file is part of CEED, a collection of benchmarks, miniapps, software
6 // libraries and APIs for efficient high-order finite element and spectral
7 // element discretizations for exascale applications. For more information and
8 // source code availability see http://github.com/ceed.
9 //
10 // The CEED research is supported by the Exascale Computing Project 17-SC-20-SC,
11 // a collaborative effort of two U.S. Department of Energy organizations (Office
12 // of Science and the National Nuclear Security Administration) responsible for
13 // the planning and preparation of a capable exascale ecosystem, including
14 // software, applications, hardware, advanced system engineering and early
15 // testbed platforms, in support of the nation's exascale computing imperative.
16 
17 /// @file
18 /// Public header for user and utility components of libCEED
19 #ifndef _ceed_h
20 #define _ceed_h
21 
22 /// @defgroup Ceed Ceed: core components
23 /// @defgroup CeedVector CeedVector: storing and manipulating vectors
24 /// @defgroup CeedElemRestriction CeedElemRestriction: restriction from vectors to elements
25 /// @defgroup CeedBasis CeedBasis: fully discrete finite element-like objects
26 /// @defgroup CeedQFunction CeedQFunction: independent operations at quadrature points
27 /// @defgroup CeedOperator CeedOperator: composed FE-type operations on vectors
28 ///
29 /// @page FunctionCategories libCEED: Types of Functions
30 /// @subsection Types of Functions
31 ///   libCEED provides three different header files depending upon the type of
32 ///   functions a user requires.
33 /// @section Utility Utility Functions
34 ///   These functions are intended general utilities that may be useful to
35 ///   libCEED developers and users. These functions can generally be found in "ceed.h".
36 /// @section Basic User Functions
37 ///   These functions are intended to be used by general users of the libCEED
38 ///   interface. These functions can generally be found in "ceed.h".
39 /// @section Advanced Backend Developer Functions
40 ///   These functions are intended to be used by backend developers of the
41 ///   libCEED interface. These functions can generally be found in "ceed-backend.h".
42 /// @section Developer Frontend Developer Functions
43 ///   These functions are intended to be used by frontend developers of the
44 ///   libCEED interface. These functions can generally be found in "ceed-impl.h".
45 
46 /**
47   CEED_EXTERN is used in this header to denote all publicly visible symbols.
48 
49   No other file should declare publicly visible symbols, thus it should never be
50   used outside ceed.h.
51  */
52 #ifdef __cplusplus
53 #  define CEED_EXTERN extern "C"
54 #else
55 #  define CEED_EXTERN extern
56 #endif
57 
58 #include <assert.h>
59 #include <stdint.h>
60 #include <stddef.h>
61 #include <stdarg.h>
62 #include <stdio.h>
63 #include <stdbool.h>
64 
65 // We can discuss ways to avoid forcing these to be compile-time decisions, but let's leave that for later.
66 /// Integer type, used for indexing
67 /// @ingroup Ceed
68 typedef int32_t CeedInt;
69 /// Scalar (floating point) type
70 /// @ingroup Ceed
71 typedef double CeedScalar;
72 
73 /// Library context created by CeedInit()
74 /// @ingroup Ceed
75 typedef struct Ceed_private *Ceed;
76 /// Non-blocking Ceed interfaces return a CeedRequest.
77 /// To perform an operation immediately, pass \ref CEED_REQUEST_IMMEDIATE instead.
78 /// @ingroup Ceed
79 typedef struct CeedRequest_private *CeedRequest;
80 /// Handle for vectors over the field \ref CeedScalar
81 /// @ingroup CeedVector
82 typedef struct CeedVector_private *CeedVector;
83 /// Handle for object describing restriction to elements
84 /// @ingroup CeedElemRestriction
85 typedef struct CeedElemRestriction_private *CeedElemRestriction;
86 /// Handle for object describing discrete finite element evaluations
87 /// @ingroup CeedBasis
88 typedef struct CeedBasis_private *CeedBasis;
89 /// Handle for object describing functions evaluated independently at quadrature points
90 /// @ingroup CeedQFunction
91 typedef struct CeedQFunction_private *CeedQFunction;
92 /// Handle for object describing FE-type operators acting on vectors
93 ///
94 /// Given an element restriction \f$E\f$, basis evaluator \f$B\f$, and quadrature function
95 /// \f$f\f$, a CeedOperator expresses operations of the form
96 ///   $$ E^T B^T f(B E u) $$
97 /// acting on the vector \f$u\f$.
98 /// @ingroup CeedOperator
99 typedef struct CeedOperator_private *CeedOperator;
100 
101 /// Handle for object describing CeedQFunction fields
102 /// @ingroup CeedQFunction
103 typedef struct CeedQFunctionField_private *CeedQFunctionField;
104 /// Handle for object describing CeedOperator fields
105 /// @ingroup CeedOperator
106 typedef struct CeedOperatorField_private *CeedOperatorField;
107 
108 CEED_EXTERN int CeedInit(const char *resource, Ceed *ceed);
109 CEED_EXTERN int CeedDestroy(Ceed *ceed);
110 
111 CEED_EXTERN int CeedErrorImpl(Ceed, const char *, int, const char *, int,
112                               const char *, ...);
113 /// Raise an error on ceed object
114 ///
115 /// @param ceed Ceed library context or NULL
116 /// @param ecode Error code (int)
117 /// @param ... printf-style format string followed by arguments as needed
118 ///
119 /// @ingroup Ceed
120 /// @sa CeedSetErrorHandler()
121 #define CeedError(ceed, ecode, ...)                                     \
122   CeedErrorImpl((ceed), __FILE__, __LINE__, __func__, (ecode), __VA_ARGS__)
123 
124 /// Specify memory type
125 ///
126 /// Many Ceed interfaces take or return pointers to memory.  This enum is used to
127 /// specify where the memory being provided or requested must reside.
128 /// @ingroup Ceed
129 typedef enum {
130   /// Memory resides on the host
131   CEED_MEM_HOST,
132   /// Memory resides on a device (corresponding to \ref Ceed resource)
133   CEED_MEM_DEVICE,
134 } CeedMemType;
135 
136 CEED_EXTERN int CeedGetPreferredMemType(Ceed ceed, CeedMemType *type);
137 
138 /// Conveys ownership status of arrays passed to Ceed interfaces.
139 /// @ingroup Ceed
140 typedef enum {
141   /// Implementation will copy the values and not store the passed pointer.
142   CEED_COPY_VALUES,
143   /// Implementation can use and modify the data provided by the user, but does
144   /// not take ownership.
145   CEED_USE_POINTER,
146   /// Implementation takes ownership of the pointer and will free using
147   /// CeedFree() when done using it.  The user should not assume that the
148   /// pointer remains valid after ownership has been transferred.  Note that
149   /// arrays allocated using C++ operator new or other allocators cannot
150   /// generally be freed using CeedFree().  CeedFree() is capable of freeing any
151   /// memory that can be freed using free(3).
152   CEED_OWN_POINTER,
153 } CeedCopyMode;
154 
155 CEED_EXTERN int CeedVectorCreate(Ceed ceed, CeedInt len, CeedVector *vec);
156 CEED_EXTERN int CeedVectorSetArray(CeedVector vec, CeedMemType mtype,
157                                    CeedCopyMode cmode, CeedScalar *array);
158 CEED_EXTERN int CeedVectorSetValue(CeedVector vec, CeedScalar value);
159 CEED_EXTERN int CeedVectorSyncArray(CeedVector vec, CeedMemType mtype);
160 CEED_EXTERN int CeedVectorGetArray(CeedVector vec, CeedMemType mtype,
161                                    CeedScalar **array);
162 CEED_EXTERN int CeedVectorGetArrayRead(CeedVector vec, CeedMemType mtype,
163                                        const CeedScalar **array);
164 CEED_EXTERN int CeedVectorRestoreArray(CeedVector vec, CeedScalar **array);
165 CEED_EXTERN int CeedVectorRestoreArrayRead(CeedVector vec,
166     const CeedScalar **array);
167 CEED_EXTERN int CeedVectorView(CeedVector vec, const char *fpfmt, FILE *stream);
168 CEED_EXTERN int CeedVectorGetLength(CeedVector vec, CeedInt *length);
169 CEED_EXTERN int CeedVectorDestroy(CeedVector *vec);
170 
171 CEED_EXTERN CeedRequest *const CEED_REQUEST_IMMEDIATE;
172 CEED_EXTERN CeedRequest *const CEED_REQUEST_ORDERED;
173 CEED_EXTERN int CeedRequestWait(CeedRequest *req);
174 
175 /// Argument for CeedOperatorSetField that vector is collocated with
176 /// quadrature points, used with qfunction eval mode CEED_EVAL_NONE
177 /// or CEED_EVAL_INTERP only, not with CEED_EVAL_GRAD, CEED_EVAL_DIV,
178 /// or CEED_EVAL_CURL
179 /// @ingroup CeedBasis
180 CEED_EXTERN CeedBasis CEED_BASIS_COLLOCATED;
181 
182 /// Argument for CeedOperatorSetField to use active input or output
183 /// @ingroup CeedVector
184 CEED_EXTERN CeedVector CEED_VECTOR_ACTIVE;
185 
186 /// Argument for CeedOperatorSetField to use no vector, used with
187 /// qfunction input with eval mode CEED_EVAL_WEIGHTS
188 /// @ingroup CeedVector
189 CEED_EXTERN CeedVector CEED_VECTOR_NONE;
190 
191 /// Denotes whether a linear transformation or its transpose should be applied
192 /// @ingroup CeedBasis
193 typedef enum {
194   /// Apply the linear transformation
195   CEED_NOTRANSPOSE,
196   /// Apply the transpose
197   CEED_TRANSPOSE
198 } CeedTransposeMode;
199 
200 CEED_EXTERN int CeedElemRestrictionCreate(Ceed ceed, CeedInt nelem,
201     CeedInt elemsize, CeedInt ndof, CeedInt ncomp, CeedMemType mtype,
202     CeedCopyMode cmode,
203     const CeedInt *indices, CeedElemRestriction *rstr);
204 CEED_EXTERN int CeedElemRestrictionCreateIdentity(Ceed ceed, CeedInt nelem,
205     CeedInt elemsize, CeedInt ndof, CeedInt ncomp, CeedElemRestriction *rstr);
206 CEED_EXTERN int CeedElemRestrictionCreateBlocked(Ceed ceed, CeedInt nelem,
207     CeedInt elemsize, CeedInt blksize, CeedInt ndof, CeedInt ncomp,
208     CeedMemType mtype,
209     CeedCopyMode cmode, const CeedInt *indices, CeedElemRestriction *rstr);
210 CEED_EXTERN int CeedElemRestrictionApply(CeedElemRestriction rstr,
211     CeedTransposeMode tmode, CeedTransposeMode lmode, CeedVector u,
212     CeedVector ru, CeedRequest *request);
213 CEED_EXTERN int CeedElemRestrictionApplyBlock(CeedElemRestriction rstr,
214     CeedInt block, CeedTransposeMode tmode, CeedTransposeMode lmode,
215     CeedVector u, CeedVector ru, CeedRequest *request);
216 CEED_EXTERN int CeedElemRestrictionDestroy(CeedElemRestriction *rstr);
217 
218 // The formalism here is that we have the structure
219 //   \int_\Omega v^T f_0(u, \nabla u, qdata) + (\nabla v)^T f_1(u, \nabla u, qdata)
220 // where gradients are with respect to the reference element.
221 
222 /// Basis evaluation mode
223 ///
224 /// Modes can be bitwise ORed when passing to most functions.
225 /// @ingroup CeedBasis
226 typedef enum {
227   /// Perform no evaluation (either because there is no data or it is already at
228   /// quadrature points)
229   CEED_EVAL_NONE   = 0,
230   /// Interpolate from nodes to quadrature points
231   CEED_EVAL_INTERP = 1,
232   /// Evaluate gradients at quadrature points from input in a nodal basis
233   CEED_EVAL_GRAD   = 2,
234   /// Evaluate divergence at quadrature points from input in a nodal basis
235   CEED_EVAL_DIV    = 4,
236   /// Evaluate curl at quadrature points from input in a nodal basis
237   CEED_EVAL_CURL   = 8,
238   /// Using no input, evaluate quadrature weights on the reference element
239   CEED_EVAL_WEIGHT = 16,
240 } CeedEvalMode;
241 
242 /// Type of quadrature; also used for location of nodes
243 /// @ingroup CeedBasis
244 typedef enum {
245   /// Gauss-Legendre quadrature
246   CEED_GAUSS = 0,
247   /// Gauss-Legendre-Lobatto quadrature
248   CEED_GAUSS_LOBATTO = 1,
249 } CeedQuadMode;
250 
251 /// Type of basis shape to create non-tensor H1 element basis
252 ///
253 /// Dimension can be extracted with bitwise AND
254 /// (CeedElemTopology & 2**(dim + 2)) == TRUE
255 /// @ingroup CeedBasis
256 typedef enum {
257   /// Line
258   CEED_LINE = 1 << 16 | 0,
259   /// Triangle - 2D shape
260   CEED_TRIANGLE = 2 << 16 | 1,
261   /// Quadralateral - 2D shape
262   CEED_QUAD = 2 << 16 | 2,
263   /// Tetrahedron - 3D shape
264   CEED_TET = 3 << 16 | 3,
265   /// Pyramid - 3D shape
266   CEED_PYRAMID = 3 << 16 | 4,
267   /// Prism - 3D shape
268   CEED_PRISM = 3 << 16 | 5,
269   /// Hexehedron - 3D shape
270   CEED_HEX = 3 << 16 | 6,
271 } CeedElemTopology;
272 
273 CEED_EXTERN int CeedBasisCreateTensorH1Lagrange(Ceed ceed, CeedInt dim,
274     CeedInt ncomp, CeedInt P, CeedInt Q, CeedQuadMode qmode, CeedBasis *basis);
275 CEED_EXTERN int CeedBasisCreateTensorH1(Ceed ceed, CeedInt dim, CeedInt ncomp,
276                                         CeedInt P1d, CeedInt Q1d, const CeedScalar *interp1d, const CeedScalar *grad1d,
277                                         const CeedScalar *qref1d, const CeedScalar *qweight1d, CeedBasis *basis);
278 CEED_EXTERN int CeedBasisCreateH1(Ceed ceed, CeedElemTopology topo,
279                                   CeedInt ncomp,
280                                   CeedInt ndof, CeedInt nqpts,
281                                   const CeedScalar *interp, const CeedScalar *grad,
282                                   const CeedScalar *qref, const CeedScalar *qweight, CeedBasis *basis);
283 CEED_EXTERN int CeedBasisView(CeedBasis basis, FILE *stream);
284 CEED_EXTERN int CeedBasisGetNumNodes(CeedBasis basis, CeedInt *P);
285 CEED_EXTERN int CeedBasisGetNumQuadraturePoints(CeedBasis basis, CeedInt *Q);
286 CEED_EXTERN int CeedBasisApply(CeedBasis basis, CeedInt nelem,
287                                CeedTransposeMode tmode,
288                                CeedEvalMode emode, CeedVector u, CeedVector v);
289 CEED_EXTERN int CeedBasisDestroy(CeedBasis *basis);
290 
291 CEED_EXTERN int CeedGaussQuadrature(CeedInt Q, CeedScalar *qref1d,
292                                     CeedScalar *qweight1d);
293 CEED_EXTERN int CeedLobattoQuadrature(CeedInt Q, CeedScalar *qref1d,
294                                       CeedScalar *qweight1d);
295 CEED_EXTERN int CeedQRFactorization(CeedScalar *mat, CeedScalar *tau, CeedInt m,
296                                     CeedInt n);
297 
298 /// Handle for the object describing the user CeedQFunction
299 ///
300 /// @param ctx - user-defined context set using CeedQFunctionSetContext() or NULL
301 ///
302 /// @param Q - number of quadrature points at which to evaluate
303 ///
304 /// @param in - array of pointers to each input argument in the order provided
305 ///             by the user in CeedQFunctionAddInput().  Each array has shape
306 ///             `[dim, ncomp, Q]` where `dim` is the geometric dimension for
307 ///             \ref CEED_EVAL_GRAD (`dim=1` for \ref CEED_EVAL_INTERP) and
308 ///             `ncomp` is the number of field components (`ncomp=1` for
309 ///             scalar fields).  This results in indexing the `i`th input at
310 ///             quadarture point `j` as `in[i][(d*ncomp + c)*Q + j]`.
311 ///
312 /// @param out - array of pointers to each output array in the order provided
313 ///              using CeedQFunctionAddOutput().  The shapes are as above for
314 ///              \a in.
315 ///
316 /// @return 0 on success, nonzero for failure.
317 ///
318 /// @ingroup CeedQFunction
319 typedef int (*CeedQFunctionUser)(void *ctx, const CeedInt Q,
320                                  const CeedScalar *const *in, CeedScalar *const *out);
321 
322 CEED_EXTERN int CeedQFunctionCreateInterior(Ceed ceed, CeedInt vlength,
323     CeedQFunctionUser f, const char *focca, CeedQFunction *qf);
324 CEED_EXTERN int CeedQFunctionAddInput(CeedQFunction qf, const char *fieldname,
325                                       CeedInt ncomp, CeedEvalMode emode);
326 CEED_EXTERN int CeedQFunctionAddOutput(CeedQFunction qf, const char *fieldname,
327                                        CeedInt ncomp, CeedEvalMode emode);
328 CEED_EXTERN int CeedQFunctionSetContext(CeedQFunction qf, void *ctx,
329                                         size_t ctxsize);
330 CEED_EXTERN int CeedQFunctionApply(CeedQFunction qf, CeedInt Q,
331                                    CeedVector *u, CeedVector *v);
332 CEED_EXTERN int CeedQFunctionDestroy(CeedQFunction *qf);
333 
334 CEED_EXTERN int CeedOperatorCreate(Ceed ceed, CeedQFunction qf,
335                                    CeedQFunction dqf, CeedQFunction dqfT,
336                                    CeedOperator *op);
337 CEED_EXTERN int CeedCompositeOperatorCreate(Ceed ceed, CeedOperator *op);
338 CEED_EXTERN int CeedOperatorSetField(CeedOperator op, const char *fieldname,
339                                      CeedElemRestriction r,
340                                      CeedTransposeMode lmode, CeedBasis b,
341                                      CeedVector v);
342 CEED_EXTERN int CeedCompositeOperatorAddSub(CeedOperator compositeop,
343     CeedOperator subop);
344 CEED_EXTERN int CeedOperatorApply(CeedOperator op, CeedVector in,
345                                   CeedVector out, CeedRequest *request);
346 CEED_EXTERN int CeedOperatorDestroy(CeedOperator *op);
347 
348 /**
349   @brief Return integer power
350 
351   @param[in] base   The base to exponentiate
352   @param[in] power  The power to raise the base to
353 
354   @return base^power
355 
356   @ref Utility
357 **/
358 static inline CeedInt CeedIntPow(CeedInt base, CeedInt power) {
359   CeedInt result = 1;
360   while (power) {
361     if (power & 1) result *= base;
362     power >>= 1;
363     base *= base;
364   }
365   return result;
366 }
367 
368 /**
369   @brief Return mimimum of two integers
370 
371   @param[in] a  The first integer to compare
372   @param[in] b  The second integer to compare
373 
374   @return The minimum of the two integers
375 
376   @ref Utility
377 **/
378 static inline CeedInt CeedIntMin(CeedInt a, CeedInt b) { return a < b ? a : b; }
379 
380 #endif
381