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/* SPDX-License-Identifier: GPL-2.0-or-later */
/** \file
* \ingroup pymathutils
*/
#include <Python.h>
#include "mathutils.h"
#include "mathutils_interpolate.h"
#include "BLI_math.h"
#include "BLI_utildefines.h"
#ifndef MATH_STANDALONE /* define when building outside blender */
# include "MEM_guardedalloc.h"
#endif
/*-------------------------DOC STRINGS ---------------------------*/
PyDoc_STRVAR(M_Interpolate_doc, "The Blender interpolate module");
/* ---------------------------------WEIGHT CALCULATION ----------------------- */
#ifndef MATH_STANDALONE
PyDoc_STRVAR(M_Interpolate_poly_3d_calc_doc,
".. function:: poly_3d_calc(veclist, pt)\n"
"\n"
" Calculate barycentric weights for a point on a polygon.\n"
"\n"
" :arg veclist: list of vectors\n"
" :arg pt: point"
" :rtype: list of per-vector weights\n");
static PyObject *M_Interpolate_poly_3d_calc(PyObject *UNUSED(self), PyObject *args)
{
float fp[3];
float(*vecs)[3];
Py_ssize_t len;
PyObject *point, *veclist, *ret;
int i;
if (!PyArg_ParseTuple(args, "OO:poly_3d_calc", &veclist, &point)) {
return NULL;
}
if (mathutils_array_parse(
fp, 2, 3 | MU_ARRAY_ZERO, point, "pt must be a 2-3 dimensional vector") == -1) {
return NULL;
}
len = mathutils_array_parse_alloc_v(((float **)&vecs), 3, veclist, __func__);
if (len == -1) {
return NULL;
}
if (len) {
float *weights = MEM_mallocN(sizeof(float) * len, __func__);
interp_weights_poly_v3(weights, vecs, len, fp);
ret = PyList_New(len);
for (i = 0; i < len; i++) {
PyList_SET_ITEM(ret, i, PyFloat_FromDouble(weights[i]));
}
MEM_freeN(weights);
PyMem_Free(vecs);
}
else {
ret = PyList_New(0);
}
return ret;
}
#endif /* MATH_STANDALONE */
static PyMethodDef M_Interpolate_methods[] = {
#ifndef MATH_STANDALONE
{"poly_3d_calc",
(PyCFunction)M_Interpolate_poly_3d_calc,
METH_VARARGS,
M_Interpolate_poly_3d_calc_doc},
#endif
{NULL, NULL, 0, NULL},
};
static struct PyModuleDef M_Interpolate_module_def = {
PyModuleDef_HEAD_INIT,
/*m_name*/ "mathutils.interpolate",
/*m_doc*/ M_Interpolate_doc,
/*m_size*/ 0,
/*m_methods*/ M_Interpolate_methods,
/*m_slots*/ NULL,
/*m_traverse*/ NULL,
/*m_clear*/ NULL,
/*m_free*/ NULL,
};
/*----------------------------MODULE INIT-------------------------*/
PyMODINIT_FUNC PyInit_mathutils_interpolate(void)
{
PyObject *submodule = PyModule_Create(&M_Interpolate_module_def);
return submodule;
}
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