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/*
* Grid transfer operators
* Copyright 2018 Anton Khirnov <anton@khirnov.net>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef MG2D_TRANSFER_H
#define MG2D_TRANSFER_H
#include <stddef.h>
#include <threadpool.h>
#include "ndarray.h"
enum GridTransferOperator {
GRID_TRANSFER_LAGRANGE_1,
GRID_TRANSFER_LAGRANGE_3,
GRID_TRANSFER_LAGRANGE_5,
GRID_TRANSFER_LAGRANGE_7,
GRID_TRANSFER_FW_1,
GRID_TRANSFER_FW_2,
GRID_TRANSFER_FW_3,
GRID_TRANSFER_FW_4,
};
/**
* A 2-dimensional grid with regular spacing.
*/
typedef struct RegularGrid2D {
/**
* Indices of the grid origin, relative to coordinate origin.
* (o0, o1) = (start[0] * step[0], start[1] * step[1])
*/
ptrdiff_t start[2];
/**
* Number of points in the domain.
*/
size_t size[2];
/**
* Size of the step between neighbouring grid points.
*/
double step[2];
} RegularGrid2D;
typedef struct GridTransferContext {
/**
* Private data, not to be accessed by the caller.
*/
void *priv;
/**
* Thread pool for parallel execution, must be set by the caller.
*/
TPContext *tp;
/**
* CPU feature flags, must be set by the caller.
*/
int cpuflags;
/**
* The operator used, set by mg2di_gt_alloc().
*/
enum GridTransferOperator op;
/**
* Source grid geometry, must be filled by the caller.
*/
RegularGrid2D src;
/**
* Destination grid geometry, must be filled by the caller.
*/
RegularGrid2D dst;
/**
* Allow extrapolating this many points beyond the source rectangle.
* Defaults to 0: forbid extrapolation.
*/
int extrapolate_distance;
} GridTransferContext;
/**
* Allocate the transfer context for the given transfer operator.
*
* @return newly allocated transfer context on success, NULL on failure
*/
GridTransferContext *mg2di_gt_alloc(enum GridTransferOperator op);
/**
* Initialize the tranfer context after all the parameters have been set.
*
* @return 0 on success, a negative error code on failure
*/
int mg2di_gt_init(GridTransferContext *ctx);
/**
* Free the transfer context and everything associated with it.
* Write NULL in the supplied pointer.
*/
void mg2di_gt_free(GridTransferContext **ctx);
/**
* Execute the transfer.
*
* @param ctx transfer context
* @param dst destination data, must match the dst grid in the transfer context
* @param src source data, must match the src grid in the transfer context
*
* @return 0 on success, a negative error code on failure.
*/
int mg2di_gt_transfer(GridTransferContext *ctx,
NDArray *dst, const NDArray *src);
#endif // MG2D_TRANSFER_H
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