bpy_app_usd.cc

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/* SPDX-FileCopyrightText: 2020 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#include "BLI_utildefines.h"
#include <Python.h>
 
#include "bpy_app_usd.hh"
 
#include "../generic/py_capi_utils.hh"
 
#ifdef WITH_USD
#  include "usd.hh"
#endif
 
static PyTypeObject BlenderAppUSDType;
 
static PyStructSequence_Field app_usd_info_fields[] = {
    {"supported", "Boolean, True when Blender is built with USD support"},
    {"version", "The USD version as a tuple of 3 numbers"},
    {"version_string", "The USD version formatted as a string"},
    {nullptr},
};
 
static PyStructSequence_Desc app_usd_info_desc = {
    /*name*/ "bpy.app.usd",
    /*doc*/
    "This module contains information about the Universal Scene Description library Bender is "
    "linked against",
    /*fields*/ app_usd_info_fields,
    /*n_in_sequence*/ ARRAY_SIZE(app_usd_info_fields) - 1,
};
 
static PyObject *make_usd_info()
{
  PyObject *usd_info = PyStructSequence_New(&BlenderAppUSDType);
 
  if (usd_info == nullptr) {
    return nullptr;
  }
 
  int pos = 0;
 
#ifndef WITH_USD
#  define SetStrItem(str) PyStructSequence_SET_ITEM(usd_info, pos++, PyUnicode_FromString(str))
#endif
 
#define SetObjItem(obj) PyStructSequence_SET_ITEM(usd_info, pos++, obj)
 
#ifdef WITH_USD
  const int curversion = blender::io::usd::USD_get_version();
  const int major = curversion / 10000;
  const int minor = (curversion / 100) % 100;
  const int patch = curversion % 100;
 
  SetObjItem(PyBool_FromLong(1));
  SetObjItem(PyC_Tuple_Pack_I32({major, minor, patch}));
  SetObjItem(PyUnicode_FromFormat("%2d, %2d, %2d", major, minor, patch));
#else
  SetObjItem(PyBool_FromLong(0));
  SetObjItem(PyC_Tuple_Pack_I32({0, 0, 0}));
  SetStrItem("Unknown");
#endif
 
  if (UNLIKELY(PyErr_Occurred())) {
    Py_DECREF(usd_info);
    return nullptr;
  }
 
#undef SetStrItem
#undef SetObjItem
 
  return usd_info;
}
 
PyObject *BPY_app_usd_struct()
{
  PyStructSequence_InitType(&BlenderAppUSDType, &app_usd_info_desc);
 
  PyObject *ret = make_usd_info();
 
  /* prevent user from creating new instances */
  BlenderAppUSDType.tp_init = nullptr;
  BlenderAppUSDType.tp_new = nullptr;
  /* Without this we can't do `set(sys.modules)` #29635. */
  BlenderAppUSDType.tp_hash = (hashfunc)_Py_HashPointer;
 
  return ret;
}