# /*#########################################################################
#
# The PyMca X-Ray Fluorescence Toolkit
#
# Copyright (c) 2004-2014 European Synchrotron Radiation Facility
#
# This file is part of the PyMca X-ray Fluorescence Toolkit developed at
# the ESRF by the Software group.
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# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
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# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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__author__ = "T. Vincent - ESRF Data Analysis"
__contact__ = "thomas.vincent@esrf.fr"
__license__ = "MIT"
__copyright__ = "European Synchrotron Radiation Facility, Grenoble, France"
__doc__ = """
Basic abstraction of platform dependent OpenGL context useful for
detecting rendering across multiple OpenGL context
"""

# context #####################################################################


def _defaultGLContextGetter():
    return None

_glContextGetter = _defaultGLContextGetter


def getGLContext():
    """Returns an instance (platform dependent) corresponding to the
    current OpenGL context in use
    :return: OpenGL context
    :rtype: None by default or a platform dependent object"""
    return _glContextGetter()


def setGLContextGetter(getter=_defaultGLContextGetter):
    """Allows to set a platform dependent function to get the GL context
    :param getter: Platform dependent GL context getter
    :type getter: Function with no args returning the current OpenGL context
    """
    global _glContextGetter
    _glContextGetter = getter
