io_scene_fbx/data_types.py

   1 # SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 # Script copyright (C) 2006-2012, assimp team
   4 # Script copyright (C) 2013 Blender Foundation
   5
   6 BOOL = b'C'[0]
   7 INT16 = b'Y'[0]
   8 INT32 = b'I'[0]
   9 INT64 = b'L'[0]
  10 FLOAT32 = b'F'[0]
  11 FLOAT64 = b'D'[0]
  12 BYTES = b'R'[0]
  13 STRING = b'S'[0]
  14 INT32_ARRAY = b'i'[0]
  15 INT64_ARRAY = b'l'[0]
  16 FLOAT32_ARRAY = b'f'[0]
  17 FLOAT64_ARRAY = b'd'[0]
  18 BOOL_ARRAY = b'b'[0]
  19 BYTE_ARRAY = b'c'[0]
  20
  21 # Some other misc defines
  22 # Known combinations so far - supposed meaning: A = animatable, A+ = animated, U = UserProp
  23 # VALID_NUMBER_FLAGS = {b'A', b'A+', b'AU', b'A+U'}  # Not used...
  24
  25 # array types - actual length may vary (depending on underlying C implementation)!
  26 import array
  27
  28 # For now, bytes and bool are assumed always 1byte.
  29 ARRAY_BOOL = 'b'
  30 ARRAY_BYTE = 'B'
  31
  32 ARRAY_INT32 = None
  33 ARRAY_INT64 = None
  34 for _t in 'ilq':
  35     size = array.array(_t).itemsize
  36     if size == 4:
  37         ARRAY_INT32 = _t
  38     elif size == 8:
  39         ARRAY_INT64 = _t
  40     if ARRAY_INT32 and ARRAY_INT64:
  41         break
  42 if not ARRAY_INT32:
  43     raise Exception("Impossible to get a 4-bytes integer type for array!")
  44 if not ARRAY_INT64:
  45     raise Exception("Impossible to get an 8-bytes integer type for array!")
  46
  47 ARRAY_FLOAT32 = None
  48 ARRAY_FLOAT64 = None
  49 for _t in 'fd':
  50     size = array.array(_t).itemsize
  51     if size == 4:
  52         ARRAY_FLOAT32 = _t
  53     elif size == 8:
  54         ARRAY_FLOAT64 = _t
  55     if ARRAY_FLOAT32 and ARRAY_FLOAT64:
  56         break
  57 if not ARRAY_FLOAT32:
  58     raise Exception("Impossible to get a 4-bytes float type for array!")
  59 if not ARRAY_FLOAT64:
  60     raise Exception("Impossible to get an 8-bytes float type for array!")