282 lines
9.1 KiB
Python
282 lines
9.1 KiB
Python
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#-*- coding: UTF-8 -*-
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"""
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PyAssimp
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This is the main-module of PyAssimp.
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"""
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import sys
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if sys.version_info < (3,0):
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raise Exception('pyassimp: need python 3.0 or newer')
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from . import structs
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import ctypes
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import os
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from . import helper
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from .errors import AssimpError
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class aiArray:
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"""
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A python class to 'safely' access C arrays.
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For m<Name> and mNum<Name> assimp class members.
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"""
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def __init__(self, instance, dataName, sizeName, i=None):
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self.instance = instance
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self.dataName = dataName
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self.sizeName = sizeName
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self.i = i
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self.count = 0
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def _GetSize(self):
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return getattr(self.instance, self.sizeName)
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def _GetData(self, index):
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if self.i != None:
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if not bool(getattr(self.instance, self.dataName)[self.i]):
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return None
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item = getattr(self.instance, self.dataName)[self.i][index]
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else:
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item = getattr(self.instance, self.dataName)[index]
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if hasattr(item, 'contents'):
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return item.contents._init()
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elif hasattr(item, '_init'):
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return item._init()
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else:
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return item
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def __next__(self):
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if self.count >= self._GetSize():
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self.count = 0
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raise StopIteration
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else:
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c = self.count
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self.count += 1
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return self._GetData(c)
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def __getitem__(self, index):
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if isinstance(index, slice):
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indices = index.indices(len(self))
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return [self.__getitem__(i) for i in range(*indices)]
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if index < 0 or index >= self._GetSize():
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raise IndexError("aiArray index out of range")
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return self._GetData(index)
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def __iter__(self):
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return self
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def __len__(self):
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return int(self._GetSize())
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def __str__(self):
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return str([x for x in self])
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def __repr__(self):
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return str([x for x in self])
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class aiTuple:
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"""
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A python class to 'safely' access C structs in a python tuple fashion.
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For C structs like vectors, matrices, colors, ...
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"""
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def __init__(self, instance):
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self.instance = instance
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self.count = 0
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def _GetSize(self):
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return len(self.instance._fields_)
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def _GetData(self, index):
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return getattr(self.instance, self.instance._fields_[index][0])
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def __next__(self):
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if self.count >= self._GetSize():
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self.count = 0
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raise StopIteration
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else:
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c = self.count
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self.count += 1
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return self._GetData(c)
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def __getitem__(self, index):
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if isinstance(index, slice):
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indices = index.indices(len(self))
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return [self.__getitem__(i) for i in range(*indices)]
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if index < 0 or index >= self._GetSize():
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raise IndexError("aiTuple index out of range")
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return self._GetData(index)
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def __iter__(self):
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return self
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def __len__(self):
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return int(self._GetSize())
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def __str__(self):
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return str([x for x in self])
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def __repr__(self):
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return str([x for x in self])
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def _init(self):
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"""
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Custom initialize() for C structs, adds safely accessable member functionality.
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"""
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if hasattr(self, '_is_init'):
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return self
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self._is_init = True
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if str(self.__class__.__name__) == "MaterialProperty":
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self.mKey._init()
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for m in list(self.__class__.__dict__.keys()):
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if m.startswith('mNum'):
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name = m.split('mNum')[1]
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if 'm'+name in list(self.__class__.__dict__.keys()):
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setattr(self.__class__, name.lower(), aiArray(self, 'm'+name , m))
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if name.lower() == "vertices":
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setattr(self.__class__, "normals", aiArray(self, 'mNormals' , m))
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setattr(self.__class__, "tangents", aiArray(self, 'mTangents' , m))
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setattr(self.__class__, "bitangets", aiArray(self, 'mBitangents' , m))
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setattr(self.__class__, "colors", [aiArray(self, 'mColors' , m, o) for o in range(len(self.mColors))])
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setattr(self.__class__, "texcoords", [aiArray(self, 'mTextureCoords' , m, o) for o in range(len(self.mColors))])
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elif m == "x" or m == "a1" or m == "b": # Vector, matrix, quat, color
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self._tuple = aiTuple(self)
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setattr(self.__class__, '__getitem__', lambda x, y: x._tuple.__getitem__(y))
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setattr(self.__class__, '__iter__', lambda x: x._tuple)
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setattr(self.__class__, 'next', lambda x: x._tuple.__next__)
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setattr(self.__class__, '__repr__', lambda x: str([c for c in x]))
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break
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elif m == "data": #String
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setattr(self.__class__, '__repr__', lambda x: str(x.data))
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setattr(self.__class__, '__str__', lambda x: str(x.data))
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break
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if hasattr(getattr(self, m), '_init'):
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getattr(self, m)._init()
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return self
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"""
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Python magic to add the _init() function to all C struct classes.
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"""
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for struct in dir(structs):
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if not (struct.startswith('_') or struct.startswith('c_') or struct == "Structure" or struct == "POINTER") and not isinstance(getattr(structs, struct),int):
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setattr(getattr(structs, struct), '_init', _init)
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class AssimpLib(object):
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"""
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Assimp-Singleton
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"""
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load, release, dll = helper.search_library()
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#the loader as singleton
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_assimp_lib = AssimpLib()
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def load(filename, processing=0):
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"""
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Loads the model with some specific processing parameters.
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filename - file to load model from
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processing - processing parameters
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result Scene-object with model-data
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throws AssimpError - could not open file
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"""
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#read pure data
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from ctypes import c_char_p, c_uint
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model = _assimp_lib.load(c_char_p(filename), c_uint(processing))
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if not model:
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#Uhhh, something went wrong!
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raise AssimpError("could not import file: %s" % filename)
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return model.contents._init()
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def release(scene):
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from ctypes import pointer
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_assimp_lib.release(pointer(scene))
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def aiGetMaterialFloatArray(material, key):
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AI_SUCCESS = 0
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from ctypes import byref, pointer, cast, c_float, POINTER, sizeof, c_uint
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out = structs.Color4D()
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max = c_uint(sizeof(structs.Color4D))
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r=_assimp_lib.dll.aiGetMaterialFloatArray(pointer(material),
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key[0],
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key[1],
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key[2],
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byref(out),
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byref(max))
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if (r != AI_SUCCESS):
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raise AssimpError("aiGetMaterialFloatArray failed!")
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out._init()
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return [out[i] for i in range(max.value)]
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def aiGetMaterialString(material, key):
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AI_SUCCESS = 0
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from ctypes import byref, pointer, cast, c_float, POINTER, sizeof, c_uint
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out = structs.String()
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r=_assimp_lib.dll.aiGetMaterialString(pointer(material),
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key[0],
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key[1],
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key[2],
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byref(out))
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if (r != AI_SUCCESS):
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raise AssimpError("aiGetMaterialString failed!")
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return str(out.data)
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def GetMaterialProperties(material):
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"""
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Convenience Function to get the material properties as a dict
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and values in a python format.
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"""
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result = {}
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#read all properties
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for p in material.properties:
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#the name
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key = p.mKey.data
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#the data
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from ctypes import POINTER, cast, c_int, c_float, sizeof
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if p.mType == 1:
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arr = cast(p.mData, POINTER(c_float*(p.mDataLength//sizeof(c_float)) )).contents
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value = [x for x in arr]
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elif p.mType == 3: #string can't be an array
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try:
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value = cast(p.mData, POINTER(structs.String)).contents.data
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except UnicodeDecodeError:
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print('UnicodeDecodeError reading material property, ignoring.')
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continue
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elif p.mType == 4:
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arr = cast(p.mData, POINTER(c_int*(p.mDataLength//sizeof(c_int)) )).contents
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value = [x for x in arr]
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else:
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value = p.mData[:p.mDataLength]
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result[key] = value
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return result
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def aiDecomposeMatrix(matrix):
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if not isinstance(matrix, structs.Matrix4x4):
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raise AssimpError("aiDecomposeMatrix failed: Not a aiMatrix4x4!")
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scaling = structs.Vector3D()
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rotation = structs.Quaternion()
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position = structs.Vector3D()
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from ctypes import byref, pointer
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_assimp_lib.dll.aiDecomposeMatrix(pointer(matrix), byref(scaling), byref(rotation), byref(position))
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return scaling._init(), rotation._init(), position._init()
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