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"""Numbers passed as array handling code for PyOpenGL
"""
REGISTRY_NAME = 'numbers'
from OpenGL.raw.GL import _types
from OpenGL.raw.GL.VERSION import GL_1_1
from OpenGL.arrays import formathandler
import ctypes
from OpenGL._bytes import long, integer_types
n = c = None
class NumberHandler(formathandler.FormatHandler):
"""Allows the user to pass a bald Python float,int, etceteras as an array-of-1"""
HANDLED_TYPES = integer_types + (
float,
_types.GLdouble,
_types.GLfloat,
_types.GLint,
_types.GLshort,
_types.GLuint,
_types.GLulong,
_types.GLushort,
_types.GLclampf,
_types.GLclampd,
)
def from_param(self, value, typeCode=None):
"""If it's a ctypes value, pass on, otherwise do asArray"""
try:
return ctypes.byref(value)
except TypeError as err:
err.args += (
' If you have ERROR_ON_COPY enabled, remember to pass in an array to array-requiring functions.',
)
raise
dataPointer = from_param
def zeros(self, dims, typeCode=None):
"""Currently don't allow Number as output types!"""
raise NotImplementedError(
"""Number data-type not allowed as an output array format"""
)
def ones(self, dims, typeCode=None):
"""Currently don't allow Number as output types!"""
raise NotImplementedError(
"""Number data-type not allowed as an output array format"""
)
def arrayToGLType(self, value):
"""Given a value, guess OpenGL type of the corresponding pointer"""
if value.__class__ in TARGET_TYPES:
return TARGET_TYPES[value.__class__]
else:
guess = DEFAULT_TYPES.get(value.__class__)
if guess is not None:
return guess[1]
raise TypeError(
"""Can't guess array data-type for %r types""" % (type(value))
)
def arraySize(self, value, typeCode=None):
"""Given a data-value, calculate ravelled size for the array"""
return 1
def asArray(self, value, typeCode=None):
"""Convert given value to an array value of given typeCode"""
if value.__class__ in TARGET_TYPES:
return value
targetType = CONSTANT_TO_TYPE.get(typeCode)
if targetType is not None:
return targetType(value)
raise TypeError(
"""Don't know how to convert %r to an array type""" % (typeCode,)
)
def unitSize(self, value, typeCode=None):
"""Determine unit size of an array (if possible)"""
return 1 # there's only 1 possible value in the set...
def registerEquivalent(self, typ, base):
"""Register a sub-class for handling as the base-type"""
global TARGET_TYPE_TUPLE
for source in (DEFAULT_TYPES, TARGET_TYPES, BYTE_SIZES):
if base in source:
source[typ] = source[base]
if base in TARGET_TYPES:
TARGET_TYPE_TUPLE = TARGET_TYPE_TUPLE + (base,)
DEFAULT_TYPES = {
float: (_types.GLdouble, GL_1_1.GL_DOUBLE),
int: (_types.GLint, GL_1_1.GL_INT),
long: (_types.GLint, GL_1_1.GL_INT),
}
TARGET_TYPES = dict(
[(getattr(_types, n), c) for (n, c) in _types.ARRAY_TYPE_TO_CONSTANT]
)
TARGET_TYPE_TUPLE = tuple(
[getattr(_types, n) for (n, c) in _types.ARRAY_TYPE_TO_CONSTANT]
)
CONSTANT_TO_TYPE = dict(
[(c, getattr(_types, n)) for (n, c) in _types.ARRAY_TYPE_TO_CONSTANT]
)
BYTE_SIZES = dict(
[(c, ctypes.sizeof(getattr(_types, n))) for (n, c) in _types.ARRAY_TYPE_TO_CONSTANT]
)
try:
del n, c
except NameError as err:
pass
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