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"""ctypes sized data-arrays as a data-formatmechanism
XXX we have to use _ctypes.Array as the type descriminator,
would be nice to have it available from the public module
"""
REGISTRY_NAME = 'ctypesarrays'
import ctypes, _ctypes
from OpenGL import constants, constant
from OpenGL.arrays import formathandler
import operator
class CtypesArrayHandler( formathandler.FormatHandler ):
"""Ctypes Array-type-specific data-type handler for OpenGL"""
from_param = staticmethod( ctypes.byref )
dataPointer = staticmethod( ctypes.addressof )
HANDLED_TYPES = (_ctypes.Array, )
def voidDataPointer( cls, value ):
"""Given value in a known data-pointer type, return void_p for pointer"""
return ctypes.byref( value )
def zeros( self, dims, typeCode ):
"""Return Numpy array of zeros in given size"""
type = GL_TYPE_TO_ARRAY_MAPPING[ typeCode ]
for dim in dims:
type *= dim
return type() # should expicitly set to 0s
def ones( self, dims, typeCode='d' ):
"""Return numpy array of ones in given size"""
raise NotImplementedError( """Haven't got a good ones implementation yet""" )
## type = GL_TYPE_TO_ARRAY_MAPPING[ typeCode ]
## for dim in dims:
## type *= dim
## return type() # should expicitly set to 0s
def arrayToGLType( self, value ):
"""Given a value, guess OpenGL type of the corresponding pointer"""
result = ARRAY_TO_GL_TYPE_MAPPING.get( value._type_ )
if result is not None:
return result
raise TypeError(
"""Don't know GL type for array of type %r, known types: %s\nvalue:%s"""%(
value._type_, ARRAY_TO_GL_TYPE_MAPPING.keys(), value,
)
)
def arraySize( self, value, typeCode = None ):
"""Given a data-value, calculate dimensions for the array"""
dims = 1
for base in self.types( value ):
length = getattr( base, '_length_', None)
if length is not None:
dims *= length
return dims
def arrayByteCount( self, value, typeCode = None ):
"""Given a data-value, calculate number of bytes required to represent"""
return ctypes.sizeof( value )
def types( self, value ):
"""Produce iterable producing all composite types"""
dimObject = value
while dimObject is not None:
yield dimObject
dimObject = getattr( dimObject, '_type_', None )
if isinstance( dimObject, (str,unicode)):
dimObject = None
def dims( self, value ):
"""Produce iterable of all dimensions"""
for base in self.types( value ):
length = getattr( base, '_length_', None)
if length is not None:
yield length
def asArray( self, value, typeCode=None ):
"""Convert given value to an array value of given typeCode"""
return value
def unitSize( self, value, typeCode=None ):
"""Determine unit size of an array (if possible)"""
for dim in self.dims( value ):
pass
return dim
def dimensions( self, value, typeCode=None ):
"""Determine dimensions of the passed array value (if possible)"""
return tuple( self.dims(value) )
ARRAY_TO_GL_TYPE_MAPPING = {
constants.GLdouble: constants.GL_DOUBLE,
constants.GLfloat: constants.GL_FLOAT,
constants.GLint: constants.GL_INT,
constants.GLuint: constants.GL_UNSIGNED_INT,
constants.GLshort: constants.GL_SHORT,
constants.GLushort: constants.GL_UNSIGNED_SHORT,
constants.GLchar: constants.GL_CHAR,
constants.GLbyte: constants.GL_BYTE,
constants.GLubyte: constants.GL_UNSIGNED_BYTE,
}
GL_TYPE_TO_ARRAY_MAPPING = {
constants.GL_DOUBLE: constants.GLdouble,
constants.GL_FLOAT: constants.GLfloat,
constants.GL_INT: constants.GLint,
constants.GL_UNSIGNED_INT: constants.GLuint,
constants.GL_SHORT: constants.GLshort,
constants.GL_UNSIGNED_SHORT: constants.GLushort,
constants.GL_CHAR: constants.GLchar,
constants.GL_BYTE: constants.GLbyte,
constants.GL_UNSIGNED_BYTE: constants.GLubyte,
}
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