241 lines
8.1 KiB
Python
241 lines
8.1 KiB
Python
# ----------------------------------------------------------------------------
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# pyglet
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# Copyright (c) 2006-2008 Alex Holkner
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# Copyright (c) 2008-2022 pyglet contributors
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in
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# the documentation and/or other materials provided with the
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# distribution.
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# * Neither the name of pyglet nor the names of its
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# contributors may be used to endorse or promote products
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# derived from this software without specific prior written
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# permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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# ----------------------------------------------------------------------------
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"""Information about version and extensions of current GL implementation.
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Usage::
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from pyglet.gl import gl_info
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if gl_info.have_extension('GL_NV_register_combiners'):
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# ...
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If you are using more than one context, you can set up a separate GLInfo
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object for each context. Call `set_active_context` after switching to the
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context::
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from pyglet.gl.gl_info import GLInfo
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info = GLInfo()
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info.set_active_context()
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if info.have_version(4, 5):
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# ...
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"""
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import warnings
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from ctypes import c_char_p, cast
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from pyglet.gl.gl import GL_EXTENSIONS, GL_RENDERER, GL_VENDOR, GL_VERSION
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from pyglet.gl.gl import GL_MAJOR_VERSION, GL_MINOR_VERSION, GLint
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from pyglet.gl.lib import GLException
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from pyglet.util import asstr
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def _get_number(parameter):
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from pyglet.gl.gl import glGetIntegerv
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number = GLint()
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glGetIntegerv(parameter, number)
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return number.value
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class GLInfo:
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"""Information interface for a single GL context.
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A default instance is created automatically when the first OpenGL context
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is created. You can use the module functions as a convenience for
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this default instance's methods.
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If you are using more than one context, you must call `set_active_context`
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when the context is active for this `GLInfo` instance.
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"""
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_have_context = False
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vendor = ''
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renderer = ''
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version = '0.0'
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major_version = 0
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minor_version = 0
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opengl_api = 'gl'
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extensions = set()
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_have_info = False
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def set_active_context(self):
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"""Store information for the currently active context.
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This method is called automatically for the default context.
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"""
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from pyglet.gl.gl import glGetString, glGetStringi, GL_NUM_EXTENSIONS
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self._have_context = True
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if not self._have_info:
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self.vendor = asstr(cast(glGetString(GL_VENDOR), c_char_p).value)
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self.renderer = asstr(cast(glGetString(GL_RENDERER), c_char_p).value)
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self.version = asstr(cast(glGetString(GL_VERSION), c_char_p).value)
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# NOTE: The version string requirements for gles is a lot stricter
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# so using this to rely on detecting the API is not too unreasonable
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self.opengl_api = "gles" if "opengl es" in self.version.lower() else "gl"
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try:
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self.major_version = _get_number(GL_MAJOR_VERSION)
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self.minor_version = _get_number(GL_MINOR_VERSION)
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num_ext = _get_number(GL_NUM_EXTENSIONS)
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self.extensions = (asstr(cast(glGetStringi(GL_EXTENSIONS, i), c_char_p).value) for i in range(num_ext))
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self.extensions = set(self.extensions)
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except GLException:
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pass # GL3 is likely not available
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self._have_info = True
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def remove_active_context(self):
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self._have_context = False
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self._have_info = False
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def have_context(self):
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return self._have_context
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def have_extension(self, extension):
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"""Determine if an OpenGL extension is available.
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:Parameters:
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`extension` : str
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The name of the extension to test for, including its
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``GL_`` prefix.
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:return: True if the extension is provided by the driver.
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:rtype: bool
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"""
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if not self._have_context:
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warnings.warn('No GL context created yet.')
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return extension in self.extensions
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def get_extensions(self):
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"""Get a list of available OpenGL extensions.
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:return: a list of the available extensions.
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:rtype: list of str
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"""
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if not self._have_context:
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warnings.warn('No GL context created yet.')
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return self.extensions
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def get_version(self):
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"""Get the current OpenGL version.
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:return: The major and minor version as a tuple
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:rtype: tuple
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"""
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if not self._have_context:
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warnings.warn('No GL context created yet.')
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return self.major_version, self.minor_version
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def get_version_string(self):
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"""Get the current OpenGL version string.
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:return: The OpenGL version string
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:rtype: str
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"""
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if not self._have_context:
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warnings.warn('No GL context created yet.')
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return self.version
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def have_version(self, major, minor=0):
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"""Determine if a version of OpenGL is supported.
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:Parameters:
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`major` : int
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The major revision number (typically 1 or 2).
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`minor` : int
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The minor revision number.
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:rtype: bool
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:return: True if the requested or a later version is supported.
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"""
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if not self._have_context:
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warnings.warn('No GL context created yet.')
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if not self.major_version and not self.minor_version:
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return False
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return (self.major_version > major or
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(self.major_version == major and self.minor_version >= minor) or
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(self.major_version == major and self.minor_version == minor))
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def get_renderer(self):
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"""Determine the renderer string of the OpenGL context.
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:rtype: str
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"""
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if not self._have_context:
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warnings.warn('No GL context created yet.')
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return self.renderer
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def get_vendor(self):
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"""Determine the vendor string of the OpenGL context.
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:rtype: str
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"""
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if not self._have_context:
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warnings.warn('No GL context created yet.')
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return self.vendor
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def get_opengl_api(self):
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"""Determine the OpenGL API version.
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Usually ``gl`` or ``gles``.
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:rtype: str
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"""
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if not self._have_context:
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warnings.warn('No GL context created yet.')
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return self.opengl_api
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# Single instance useful for apps with only a single context
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# (or all contexts have the same GL driver, a common case).
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_gl_info = GLInfo()
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get_extensions = _gl_info.get_extensions
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get_version = _gl_info.get_version
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get_version_string = _gl_info.get_version_string
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have_version = _gl_info.have_version
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get_renderer = _gl_info.get_renderer
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get_vendor = _gl_info.get_vendor
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get_opengl_api = _gl_info.get_opengl_api
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have_extension = _gl_info.have_extension
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have_context = _gl_info.have_context
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remove_active_context = _gl_info.remove_active_context
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set_active_context = _gl_info.set_active_context
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