# coding: utf-8
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"""Abstraction of OpenGL context.

It defines a way to get current OpenGL context to support multiple
OpenGL contexts.
"""

__authors__ = ["T. Vincent"]
__license__ = "MIT"
__date__ = "25/07/2016"


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


def _defaultGLContextGetter():
    return None

_glContextGetter = _defaultGLContextGetter


def getGLContext():
    """Returns platform dependent object of current OpenGL context.

    This is useful to associate OpenGL resources with the context they are
    created in.

    :return: Platform specific OpenGL context
    :rtype: None by default or a platform dependent object"""
    return _glContextGetter()


def setGLContextGetter(getter=_defaultGLContextGetter):
    """Set a platform dependent function to retrieve the current OpenGL context

    :param getter: Platform dependent GL context getter
    :type getter: Function with no args returning the current OpenGL context
    """
    global _glContextGetter
    _glContextGetter = getter