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- """NumArray implementation of the OpenGL-ctypes array interfaces
- """
- REGISTRY_NAME = 'numarray'
- try:
- import numarray
- except ImportError, err:
- raise ImportError( """No numarray module present: %s"""%(err))
- import operator
-
- from OpenGL.arrays import numericnames
- implementationModuleName = numericnames.moduleName( numarray )
- try:
- implementationModule = numericnames.loadModule( implementationModuleName )
- except ImportError, err:
- raise ImportError( """Do not have implementation module %s for current numpy module"""%(
- implementationModuleName,
- ))
- dataPointer = implementationModule.dataPointer
-
- from OpenGL import constants, constant
- from OpenGL.arrays import formathandler
-
- class NumarrayHandler( formathandler.FormatHandler ):
- """Numarray-specific data-type handler for OpenGL"""
- @classmethod
- def from_param( cls, value, typeCode=None ):
- return dataPointer( value )
- dataPointer = staticmethod( dataPointer )
- HANDLED_TYPES = (numarray.ArrayType, )
- isOutput = True
-
- def voidDataPointer( cls, value ):
- """Given value in a known data-pointer type, return void_p for pointer"""
- return ctypes.c_void_p( self.dataPointer( value ))
- def zeros( self, dims, typeCode ):
- """Return Numpy array of zeros in given size"""
- return numarray.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.typecode()
- 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 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 -- numarray 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 numarray.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[ typeCode ]
- if isinstance( source, numarray.ArrayType):
- if source.iscontiguous() and (typeCode is None or typeCode==source.typecode()):
- return source
- else:
- # We have to do astype to avoid errors about unsafe conversions
- # XXX Confirm that this will *always* create a new contiguous array
- # XXX Allow a way to make this raise an error for performance reasons
- # XXX Guard against wacky conversion types like uint to float, where
- # we really don't want to have the C-level conversion occur.
- return numarray.array( source.astype( typeCode ), typeCode )
- elif typeCode:
- return numarray.array( source, typeCode )
- else:
- return numarray.array( 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
-
-
- ARRAY_TO_GL_TYPE_MAPPING = {
- 'd': constants.GL_DOUBLE,
- 'f': constants.GL_FLOAT,
- 'i': constants.GL_INT,
- 's': constants.GL_SHORT,
- '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_UNSIGNED_INT: 'i',
- constants.GL_UNSIGNED_BYTE: 'c',
- constants.GL_SHORT: 's',
- constants.GL_UNSIGNED_SHORT: 's',
- constants.GL_BYTE: 'b',
- }
-