# ----------------------------------------------------------------------------
# pyglet
# Copyright (c) 2006-2008 Alex Holkner
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
# * Neither the name of pyglet nor the names of its
# contributors may be used to endorse or promote products
# derived from this software without specific prior written
# permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
# ----------------------------------------------------------------------------
'''Information about version and extensions of current GL implementation.
Usage::
from pyglet.gl import gl_info
if gl_info.have_extension('GL_NV_register_combiners'):
# ...
If you are using more than one context, you can set up a separate GLInfo
object for each context. Call `set_active_context` after switching to the
context::
from pyglet.gl.gl_info import GLInfo
info = GLInfo()
info.set_active_context()
if info.have_version(2, 1):
# ...
'''
__docformat__ = 'restructuredtext'
__version__ = '$Id: $'
from ctypes import *
import warnings
from pyglet.gl.gl import *
class GLInfo(object):
'''Information interface for a single GL context.
A default instance is created automatically when the first OpenGL context
is created. You can use the module functions as a convenience for
this default instance's methods.
If you are using more than one context, you must call `set_active_context`
when the context is active for this `GLInfo` instance.
'''
have_context = False
version = '0.0.0'
vendor = ''
renderer = ''
extensions = set()
_have_info = False
def set_active_context(self):
'''Store information for the currently active context.
This method is called automatically for the default context.
'''
self.have_context = True
if not self._have_info:
self.vendor = cast(glGetString(GL_VENDOR), c_char_p).value
self.renderer = cast(glGetString(GL_RENDERER), c_char_p).value
self.extensions = cast(glGetString(GL_EXTENSIONS), c_char_p).value
if self.extensions:
self.extensions = set(self.extensions.split())
self.version = cast(glGetString(GL_VERSION), c_char_p).value
self._have_info = True
def remove_active_context(self):
self.have_context = False
def have_extension(self, extension):
'''Determine if an OpenGL extension is available.
:Parameters:
`extension` : str
The name of the extension to test for, including its
``GL_`` prefix.
:return: True if the extension is provided by the driver.
:rtype: bool
'''
if not self.have_context:
warnings.warn('No GL context created yet.')
return extension in self.extensions
def get_extensions(self):
'''Get a list of available OpenGL extensions.
:return: a list of the available extensions.
:rtype: list of str
'''
if not self.have_context:
warnings.warn('No GL context created yet.')
return self.extensions
def get_version(self):
'''Get the current OpenGL version.
:return: the OpenGL version
:rtype: str
'''
if not self.have_context:
warnings.warn('No GL context created yet.')
return self.version
def have_version(self, major, minor=0, release=0):
'''Determine if a version of OpenGL is supported.
:Parameters:
`major` : int
The major revision number (typically 1 or 2).
`minor` : int
The minor revision number.
`release` : int
The release number.
:rtype: bool
:return: True if the requested or a later version is supported.
'''
if not self.have_context:
warnings.warn('No GL context created yet.')
ver = '%s.0.0' % self.version.split(' ', 1)[0]
imajor, iminor, irelease = [int(v) for v in ver.split('.', 3)[:3]]
return imajor > major or \
(imajor == major and iminor > minor) or \
(imajor == major and iminor == minor and irelease >= release)
def get_renderer(self):
'''Determine the renderer string of the OpenGL context.
:rtype: str
'''
if not self.have_context:
warnings.warn('No GL context created yet.')
return self.renderer
def get_vendor(self):
'''Determine the vendor string of the OpenGL context.
:rtype: str
'''
if not self.have_context:
warnings.warn('No GL context created yet.')
return self.vendor
# Single instance useful for apps with only a single context (or all contexts
# have same GL driver, common case).
_gl_info = GLInfo()
set_active_context = _gl_info.set_active_context
remove_active_context = _gl_info.remove_active_context
have_extension = _gl_info.have_extension
get_extensions = _gl_info.get_extensions
get_version = _gl_info.get_version
have_version = _gl_info.have_version
get_renderer = _gl_info.get_renderer
get_vendor = _gl_info.get_vendor
def have_context():
'''Determine if a default OpenGL context has been set yet.
:rtype: bool
'''
return _gl_info.have_context
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