math_utils.h

// Copyright (c) "2019, by Stanford University
//               Developer: Mario Di Renzo
//               Affiliation: Center for Turbulence Research, Stanford University
//               URL: https://ctr.stanford.edu
//               Citation: Di Renzo, M., Lin, F., and Urzay, J. (2020).
//                         HTR solver: An open-source exascale-oriented task-based
//                         multi-GPU high-order code for hypersonic aerothermodynamics.
//                         Computer Physics Communications 255, 107262"
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//    * Redistributions of source code must retain the above copyright
//      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.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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#ifndef __MATH_UTILS_H__
#define __MATH_UTILS_H__

//-----------------------------------------------------------------------------
// Fast interpolation using the integer domain
//-----------------------------------------------------------------------------

// Fast interpolation reference data
struct FastInterpData {
   int nloc;
   double xmin;
   double xmax;
   double small;
   double dxloc;
   double idxloc;
};

// Integer domain region data type
// NOTE: Single precision is sufficient at this stage
struct FastInterpType {
   float xloc;
   float iloc;
};

enum FI_FieldIDs {
   FI_FID_xloc = 101,
   FI_FID_iloc,
   // keep last for counting
   FI_FID_last
};

#endif // __MATH_UTILS_H__