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/*
* N-dimensional strided array
* 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_NDARRAY_H
#define MG2D_NDARRAY_H
#include <stddef.h>
#include <stdint.h>
typedef struct Slice {
ptrdiff_t start;
ptrdiff_t end;
ptrdiff_t step;
} Slice;
#define SLICE(start, end, step) ((Slice){ start, end, step })
#define SLICE_NULL ((Slice){ PTRDIFF_MAX })
typedef struct NDArrayInternal NDArrayInternal;
typedef struct NDArray {
NDArrayInternal *priv;
unsigned int dims;
double *data;
const size_t *shape;
const ptrdiff_t *stride;
} NDArray;
#define NDARRAY_ALLOC_ZERO (1 << 0)
#define NDIDX1D(arr, x) ((arr)->stride[0] * (x))
#define NDIDX2D(arr, x, y) ((arr)->stride[0] * (y) + (arr)->stride[1] * (x))
#define NDIDX3D(arr, x, y, z) ((arr)->stride[0] * (z) + (arr)->stride[1] * (y) + (arr)->stride[0] * (x))
#define NDPTR1D(arr, x) ((arr)->data + NDIDX1D(arr, x))
#define NDPTR2D(arr, x, y) ((arr)->data + NDIDX2D(arr, x, y))
#define NDPTR3D(arr, x, y, z) ((arr)->data + NDIDX2D(arr, x, y, z))
int mg2di_ndarray_alloc(NDArray **result, unsigned int dims,
const size_t * const size, unsigned int flags);
void mg2di_ndarray_free(NDArray **a);
int mg2di_ndarray_wrap(NDArray **result, unsigned int dims,
const size_t * const size, double *data,
const ptrdiff_t * const strides);
int mg2di_ndarray_slice(NDArray **result, NDArray *src,
const Slice * const slice);
int mg2di_ndarray_copy(NDArray *dst, const NDArray *src);
#endif // MG2D_ARRAY_H
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