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// python2/3 module for tinyobjloader

// usage:

// import tinyobjloader as tol

// model = tol.LoadObj(name)

// print(model["shapes"])

// print(model["materials"]

// note:

// `shape.mesh.index_t` is represented as flattened array: (vertex_index, normal_index, texcoord_index) * num_faces

#include <Python.h>

#include <vector>

#include "../tiny_obj_loader.h"

typedef std::vector<double> vectd;

typedef std::vector<int> vecti;

PyObject* pyTupleFromfloat3(float array[3]) {

int i;

PyObject* tuple = PyTuple_New(3);

for (i = 0; i <= 2; i++) {

PyTuple_SetItem(tuple, i, PyFloat_FromDouble(array[i]));

}

return tuple;

}

extern "C" {

static PyObject* pyLoadObj(PyObject* self, PyObject* args) {

PyObject *rtndict, *pyshapes, *pymaterials, *pymaterial_indices, *attribobj, *current, *meshobj;

char const* current_name;

char const* filename;

vectd vect;

std::vector<tinyobj::index_t> indices;

std::vector<unsigned char> face_verts;

tinyobj::attrib_t attrib;

std::vector<tinyobj::shape_t> shapes;

std::vector<tinyobj::material_t> materials;

if (!PyArg_ParseTuple(args, "s", &filename)) return NULL;

std::string err, warn;

tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err, filename);

pyshapes = PyDict_New();

pymaterials = PyDict_New();

pymaterial_indices = PyList_New(0);

rtndict = PyDict_New();

attribobj = PyDict_New();

for (int i = 0; i <= 2; i++) {

current = PyList_New(0);

switch (i) {

case 0:

current_name = "vertices";

vect = vectd(attrib.vertices.begin(), attrib.vertices.end());

break;

case 1:

current_name = "normals";

vect = vectd(attrib.normals.begin(), attrib.normals.end());

break;

case 2:

current_name = "texcoords";

vect = vectd(attrib.texcoords.begin(), attrib.texcoords.end());

break;

}

for (vectd::iterator it = vect.begin(); it != vect.end(); it++) {

PyObject* value = PyFloat_FromDouble(*it);

PyList_Insert(current, it - vect.begin(), value);

Py_DECREF(value);

}

PyDict_SetItemString(attribobj, current_name, current);

Py_DECREF(current);

}

for (std::vector<tinyobj::shape_t>::iterator shape = shapes.begin(); shape != shapes.end(); shape++) {

meshobj = PyDict_New();

tinyobj::mesh_t cm = (*shape).mesh;

{

current = PyList_New(0);

for (size_t i = 0; i < cm.indices.size(); i++) {

// Flatten index array: v_idx, vn_idx, vt_idx, v_idx, vn_idx, vt_idx,

PyObject* value = PyLong_FromLong(cm.indices[i].vertex_index);

PyList_Insert(current, 3 * i + 0, value);

Py_DECREF(value);

value = PyLong_FromLong(cm.indices[i].normal_index);

PyList_Insert(current, 3 * i + 1, value);

Py_DECREF(value);

value = PyLong_FromLong(cm.indices[i].texcoord_index);

PyList_Insert(current, 3 * i + 2, value);

Py_DECREF(value);

}

PyDict_SetItemString(meshobj, "indices", current);

Py_DECREF(current);

}

{

current = PyList_New(0);

for (size_t i = 0; i < cm.num_face_vertices.size(); i++) {

// Widen data type to long.

PyObject* value = PyLong_FromLong(cm.num_face_vertices[i]);

PyList_Insert(current, i, value);

Py_DECREF(value);

}

PyDict_SetItemString(meshobj, "num_face_vertices", current);

Py_DECREF(current);

}

{

current = PyList_New(0);

for (size_t i = 0; i < cm.material_ids.size(); i++) {

PyObject* value = PyLong_FromLong(cm.material_ids[i]);

PyList_Insert(current, i, value);

Py_DECREF(value);

}

PyDict_SetItemString(meshobj, "material_ids", current);

Py_DECREF(current);

}

PyDict_SetItemString(pyshapes, (*shape).name.c_str(), meshobj);

Py_DECREF(meshobj);

}

for (std::vector<tinyobj::material_t>::iterator mat = materials.begin(); mat != materials.end(); mat++) {

PyObject* matobj = PyDict_New();

PyObject* unknown_parameter = PyDict_New();

for (std::map<std::string, std::string>::iterator p = mat->unknown_parameter.begin(); p != mat->unknown_parameter.end(); ++p) {

PyObject* value = PyUnicode_FromString(p->second.c_str());

PyDict_SetItemString(unknown_parameter, p->first.c_str(), value);

Py_DECREF(value);

}

PyObject* value = PyFloat_FromDouble(mat->shininess);

PyDict_SetItemString(matobj, "shininess", value);

Py_DECREF(value);

value = PyFloat_FromDouble(mat->ior);

PyDict_SetItemString(matobj, "ior", value);

Py_DECREF(value);

value = PyFloat_FromDouble(mat->dissolve);

PyDict_SetItemString(matobj, "dissolve", value);

Py_DECREF(value);

value = PyLong_FromLong(mat->illum);

PyDict_SetItemString(matobj, "illum", value);

Py_DECREF(value);

value = PyUnicode_FromString(mat->ambient_texname.c_str());

PyDict_SetItemString(matobj, "ambient_texname", value);

Py_DECREF(value);

value = PyUnicode_FromString(mat->diffuse_texname.c_str());

PyDict_SetItemString(matobj, "diffuse_texname", value);

Py_DECREF(value);

value = PyUnicode_FromString(mat->specular_texname.c_str());

PyDict_SetItemString(matobj, "specular_texname", value);

Py_DECREF(value);

value = PyUnicode_FromString(mat->specular_highlight_texname.c_str());

PyDict_SetItemString(matobj, "specular_highlight_texname", value);

Py_DECREF(value);

value = PyUnicode_FromString(mat->bump_texname.c_str());

PyDict_SetItemString(matobj, "bump_texname", value);

Py_DECREF(value);

value = PyUnicode_FromString(mat->displacement_texname.c_str());

PyDict_SetItemString(matobj, "displacement_texname", value);

Py_DECREF(value);

value = PyUnicode_FromString(mat->alpha_texname.c_str());

PyDict_SetItemString(matobj, "alpha_texname", value);

Py_DECREF(value);

PyDict_SetItemString(matobj, "ambient", pyTupleFromfloat3(mat->ambient));

PyDict_SetItemString(matobj, "diffuse", pyTupleFromfloat3(mat->diffuse));

PyDict_SetItemString(matobj, "specular", pyTupleFromfloat3(mat->specular));

PyDict_SetItemString(matobj, "transmittance", pyTupleFromfloat3(mat->transmittance));

PyDict_SetItemString(matobj, "emission", pyTupleFromfloat3(mat->emission));

PyDict_SetItemString(matobj, "unknown_parameter", unknown_parameter);

Py_DECREF(unknown_parameter);

PyDict_SetItemString(pymaterials, mat->name.c_str(), matobj);

Py_DECREF(matobj);

value = PyUnicode_FromString(mat->name.c_str());

PyList_Append(pymaterial_indices, value);

Py_DECREF(value);

}

PyDict_SetItemString(rtndict, "shapes", pyshapes);

Py_DECREF(pyshapes);

PyDict_SetItemString(rtndict, "materials", pymaterials);

Py_DECREF(pymaterials);

PyDict_SetItemString(rtndict, "material_indices", pymaterial_indices);

Py_DECREF(pymaterial_indices);

PyDict_SetItemString(rtndict, "attribs", attribobj);

Py_DECREF(attribobj);

return rtndict;

}

static PyMethodDef mMethods[] = {

{"LoadObj", pyLoadObj, METH_VARARGS}, {NULL, NULL, 0, NULL}

};

#if PY_MAJOR_VERSION >= 3

static struct PyModuleDef moduledef = {PyModuleDef_HEAD_INIT, "tinyobjloader", NULL, -1, mMethods};

PyMODINIT_FUNC PyInit_tinyobjloader(void) {

return PyModule_Create(&moduledef);

}

#else

PyMODINIT_FUNC inittinyobjloader(void) {

Py_InitModule3("tinyobjloader", mMethods, NULL);

}

#endif // PY_MAJOR_VERSION >= 3

}