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"""Numpy (new version) module implementation of the OpenGL-ctypes array interfaces
XXX Need to register handlers for all of the scalar types that numpy returns,
would like to have all return values be int/float if they are of compatible
type as well.
"""
REGISTRY_NAME = 'numpy'
try:
import numpy
except ImportError, err:
raise ImportError( """No numpy module present: %s"""%(err))
import operator
import OpenGL
import ctypes
# numpy's array interface has changed over time :(
testArray = numpy.array( [1,2,3,4],'i' )
if hasattr( testArray, 'ctypes' ):
if hasattr( testArray.ctypes.data, 'value' ):
def dataPointer( self, instance ):
"""Use newer numpy's proper ctypes interface"""
try:
return instance.ctypes.data.value
except AttributeError, err:
instance = self.asArray( instance )
return instance.ctypes.data.value
else:
def dataPointer( self, instance ):
"""Use newer numpy's proper ctypes interface"""
try:
return instance.ctypes.data
except AttributeError, err:
instance = self.asArray( instance )
return instance.ctypes.data
# def voidDataPointer( self, instance ):
# """Get a void data pointer for the instance"""
# try:
# return instance.ctypes.data_as( ctypes.c_void_p )
# except AttributeError, err:
# instance = self.asArray( instance )
# return instance.ctypes.data_as( ctypes.c_void_p )
elif hasattr(testArray,'__array_data__'):
def dataPointer( self, instance ):
"""Convert given instance to a data-pointer value (integer)"""
try:
return long(instance.__array_data__[0],0)
except AttributeError, err:
instance = self.asArray( instance )
try:
return long(instance.__array_interface__['data'][0])
except AttributeError, err:
return long(instance.__array_data__[0],0)
else:
def dataPointer( self, instance ):
"""Convert given instance to a data-pointer value (integer)"""
try:
return long(instance.__array_interface__['data'][0])
except AttributeError, err:
instance = self.asArray( instance )
try:
return long(instance.__array_interface__['data'][0])
except AttributeError, err:
return long(instance.__array_data__[0],0)
del testArray
from OpenGL import constants, constant
from OpenGL.arrays import formathandler
class NumpyHandler( formathandler.FormatHandler ):
"""Numpy-specific data-type handler for OpenGL
Attributes:
ERROR_ON_COPY -- if True, will raise errors
if we have to copy an array object in order to produce
a contiguous array of the correct type.
"""
HANDLED_TYPES = (numpy.ndarray, list, tuple )
dataPointer = dataPointer
def from_param( self, instance ):
return ctypes.c_void_p( self.dataPointer( instance ))
ERROR_ON_COPY = OpenGL.ERROR_ON_COPY
def zeros( self, dims, typeCode ):
"""Return Numpy array of zeros in given size"""
return numpy.zeros( dims, GL_TYPE_TO_ARRAY_MAPPING.get(typeCode) or typeCode )
def arrayToGLType( self, value ):
"""Given a value, guess OpenGL type of the corresponding pointer"""
typeCode = value.dtype.char
constant = ARRAY_TO_GL_TYPE_MAPPING.get( typeCode )
if constant is None:
raise TypeError(
"""Don't know GL type for array of type %r, known types: %s\nvalue:%s"""%(
typeCode, ARRAY_TO_GL_TYPE_MAPPING.keys(), value,
)
)
return constant
def arraySize( self, value, typeCode = None ):
"""Given a data-value, calculate dimensions for the array"""
try:
dimValue = value.shape
except AttributeError, err:
# XXX it's a list or a tuple, how do we determine dimensions there???
# for now we'll just punt and convert to an array first...
value = self.asArray( value, typeCode )
dimValue = value.shape
dims = 1
for dim in dimValue:
dims *= dim
return dims
def arrayByteCount( self, value, typeCode = None ):
"""Given a data-value, calculate number of bytes required to represent"""
try:
return self.arraySize( value, typeCode ) * value.itemsize
except AttributeError, err:
value = self.asArray( value, typeCode )
return self.arraySize( value, typeCode ) * value.itemsize
def asArray( self, value, typeCode=None ):
"""Convert given value to an array value of given typeCode"""
if value is None:
return value
else:
return self.contiguous( value, typeCode )
def contiguous( self, source, typeCode=None ):
"""Get contiguous array from source
source -- numpy Python array (or compatible object)
for use as the data source. If this is not a contiguous
array of the given typeCode, a copy will be made,
otherwise will just be returned unchanged.
typeCode -- optional 1-character typeCode specifier for
the numpy.array function.
All gl*Pointer calls should use contiguous arrays, as non-
contiguous arrays will be re-copied on every rendering pass.
Although this doesn't raise an error, it does tend to slow
down rendering.
"""
typeCode = GL_TYPE_TO_ARRAY_MAPPING.get( typeCode )
if isinstance( source, numpy.ndarray):
if source.flags.contiguous and (typeCode is None or typeCode==source.dtype.char):
return source
elif (source.flags.contiguous and self.ERROR_ON_COPY):
from OpenGL import error
raise error.CopyError(
"""Array of type %r passed, required array of type %r""",
source.dtype.char, typeCode,
)
else:
# We have to do astype to avoid errors about unsafe conversions
# XXX Confirm that this will *always* create a new contiguous array
# XXX Guard against wacky conversion types like uint to float, where
# we really don't want to have the C-level conversion occur.
# XXX ascontiguousarray is apparently now available in numpy!
if self.ERROR_ON_COPY:
from OpenGL import error
raise error.CopyError(
"""Non-contiguous array passed""",
source,
)
if typeCode is None:
typeCode = source.dtype.char
return numpy.ascontiguousarray( source.astype( typeCode ), typeCode )
elif typeCode:
return numpy.ascontiguousarray( source, typeCode )
else:
return numpy.ascontiguousarray( source )
def unitSize( self, value, typeCode=None ):
"""Determine unit size of an array (if possible)"""
return value.shape[-1]
def dimensions( self, value, typeCode=None ):
"""Determine dimensions of the passed array value (if possible)"""
return value.shape
try:
numpy.array( [1], 's' )
SHORT_TYPE = 's'
except TypeError, err:
SHORT_TYPE = 'h'
USHORT_TYPE = 'H'
ARRAY_TO_GL_TYPE_MAPPING = {
'd': constants.GL_DOUBLE,
'f': constants.GL_FLOAT,
'i': constants.GL_INT,
SHORT_TYPE: constants.GL_SHORT,
USHORT_TYPE: constants.GL_UNSIGNED_SHORT,
'B': constants.GL_UNSIGNED_BYTE,
'c': constants.GL_UNSIGNED_BYTE,
'b': constants.GL_BYTE,
'I': constants.GL_UNSIGNED_INT,
}
GL_TYPE_TO_ARRAY_MAPPING = {
constants.GL_DOUBLE: 'd',
constants.GL_FLOAT:'f',
constants.GL_INT: 'i',
constants.GL_BYTE: 'b',
constants.GL_SHORT: SHORT_TYPE,
constants.GL_UNSIGNED_INT: 'I',
constants.GL_UNSIGNED_BYTE: 'B',
constants.GL_UNSIGNED_SHORT: USHORT_TYPE,
}
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