112 lines
2.7 KiB
C++
112 lines
2.7 KiB
C++
/* SPDX-FileCopyrightText: 2023 Blender Foundation
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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/** \file
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* \ingroup pymathutils
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*/
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#include <Python.h>
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#include "mathutils.h"
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#include "mathutils_interpolate.h"
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#include "BLI_math.h"
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#include "BLI_utildefines.h"
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#ifndef MATH_STANDALONE /* define when building outside blender */
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# include "MEM_guardedalloc.h"
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#endif
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/*-------------------------DOC STRINGS ---------------------------*/
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PyDoc_STRVAR(M_Interpolate_doc, "The Blender interpolate module");
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/* ---------------------------------WEIGHT CALCULATION ----------------------- */
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#ifndef MATH_STANDALONE
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PyDoc_STRVAR(M_Interpolate_poly_3d_calc_doc,
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".. function:: poly_3d_calc(veclist, pt)\n"
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"\n"
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" Calculate barycentric weights for a point on a polygon.\n"
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"\n"
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" :arg veclist: list of vectors\n"
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" :arg pt: point"
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" :rtype: list of per-vector weights\n");
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static PyObject *M_Interpolate_poly_3d_calc(PyObject * /*self*/, PyObject *args)
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{
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float fp[3];
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float(*vecs)[3];
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Py_ssize_t len;
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PyObject *point, *veclist, *ret;
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int i;
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if (!PyArg_ParseTuple(args, "OO:poly_3d_calc", &veclist, &point)) {
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return nullptr;
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}
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if (mathutils_array_parse(
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fp, 2, 3 | MU_ARRAY_ZERO, point, "pt must be a 2-3 dimensional vector") == -1)
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{
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return nullptr;
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}
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len = mathutils_array_parse_alloc_v(((float **)&vecs), 3, veclist, __func__);
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if (len == -1) {
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return nullptr;
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}
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if (len) {
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float *weights = static_cast<float *>(MEM_mallocN(sizeof(float) * len, __func__));
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interp_weights_poly_v3(weights, vecs, len, fp);
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ret = PyList_New(len);
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for (i = 0; i < len; i++) {
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PyList_SET_ITEM(ret, i, PyFloat_FromDouble(weights[i]));
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}
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MEM_freeN(weights);
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PyMem_Free(vecs);
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}
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else {
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ret = PyList_New(0);
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}
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return ret;
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}
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#endif /* MATH_STANDALONE */
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static PyMethodDef M_Interpolate_methods[] = {
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#ifndef MATH_STANDALONE
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{"poly_3d_calc",
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(PyCFunction)M_Interpolate_poly_3d_calc,
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METH_VARARGS,
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M_Interpolate_poly_3d_calc_doc},
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#endif
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{nullptr, nullptr, 0, nullptr},
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};
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static PyModuleDef M_Interpolate_module_def = {
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/*m_base*/ PyModuleDef_HEAD_INIT,
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/*m_name*/ "mathutils.interpolate",
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/*m_doc*/ M_Interpolate_doc,
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/*m_size*/ 0,
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/*m_methods*/ M_Interpolate_methods,
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/*m_slots*/ nullptr,
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/*m_traverse*/ nullptr,
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/*m_clear*/ nullptr,
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/*m_free*/ nullptr,
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};
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/*----------------------------MODULE INIT-------------------------*/
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PyMODINIT_FUNC PyInit_mathutils_interpolate()
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{
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PyObject *submodule = PyModule_Create(&M_Interpolate_module_def);
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return submodule;
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}
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