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# -*- coding: utf-8 -*-
# Copyright (c) Vispy Development Team. All Rights Reserved.
# Distributed under the (new) BSD License. See LICENSE.txt for more info.
""" vispy.app.backends
The backend modules are dynamically imported when needed. This module
defines a small description of each supported backend, so that for
instance we can test whether the GUI toolkit for a backend is already
imported. This stuff is mostly used in the Application.use method.
"""
# Define backends: name, vispy.app.backends.xxx module, native module name.
# This is the order in which they are attempted to be imported.
CORE_BACKENDS = [
('PyQt4', '_pyqt4', 'PyQt4'),
('PyQt5', '_pyqt5', 'PyQt5'),
('PySide', '_pyside', 'PySide'),
('PySide2', '_pyside2', 'PySide2'),
('Pyglet', '_pyglet', 'pyglet'),
('Glfw', '_glfw', 'vispy.ext.glfw'),
('SDL2', '_sdl2', 'sdl2'),
('wx', '_wx', 'wx'),
('EGL', '_egl', 'vispy.ext.egl'),
('osmesa', '_osmesa', 'vispy.ext.osmesa'),
]
# Whereas core backends really represents libraries that can create a
# canvas, the pseudo backends act more like a proxy.
PSEUDO_BACKENDS = [
# ('ipynb_vnc', '_ipynb_vnc', None),
# ('ipynb_static', '_ipynb_static', None),
('ipynb_webgl', '_ipynb_webgl', None),
('_test', '_test', 'vispy.app.backends._test'), # add one that will fail
]
# Combine
BACKENDS = CORE_BACKENDS + PSEUDO_BACKENDS
# Get list of backend names
BACKEND_NAMES = [b[0].lower() for b in BACKENDS]
# Map of the lowercase backend names to the backend descriptions above
# so that we can look up its properties if we only have a name.
BACKENDMAP = dict([(be[0].lower(), be) for be in BACKENDS])
# List of attempted backends. For logging.
TRIED_BACKENDS = []
# Flag for _pyside, _pyside2 _pyqt4 and _qt modules to communicate.
qt_lib = None
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