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508 lines
17 KiB
Python
508 lines
17 KiB
Python
# ----------------------------------------------------------------------------
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# pyglet
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# Copyright (c) 2006-2008 Alex Holkner
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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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'''OpenGL and GLU interface.
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This package imports all OpenGL, GLU and registered OpenGL extension
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functions. Functions have identical signatures to their C counterparts. For
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example::
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from pyglet.gl import *
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# [...omitted: set up a GL context and framebuffer]
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glBegin(GL_QUADS)
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glVertex3f(0, 0, 0)
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glVertex3f(0.1, 0.2, 0.3)
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glVertex3f(0.1, 0.2, 0.3)
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glEnd()
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OpenGL is documented in full at the `OpenGL Reference Pages`_.
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The `OpenGL Programming Guide`_ is a popular reference manual organised by
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topic. The free online version documents only OpenGL 1.1. `Later editions`_
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cover more recent versions of the API and can be purchased from a book store.
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.. _OpenGL Reference Pages: http://www.opengl.org/documentation/red_book/
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.. _OpenGL Programming Guide: http://fly.cc.fer.hr/~unreal/theredbook/
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.. _Later editions: http://www.opengl.org/documentation/red_book/
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The following subpackages are imported into this "mega" package already (and
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so are available by importing ``pyglet.gl``):
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``pyglet.gl.gl``
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OpenGL
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``pyglet.gl.glu``
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GLU
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``pyglet.gl.gl.glext_arb``
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ARB registered OpenGL extension functions
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``pyglet.gl.gl.glext_missing``
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ARB registered OpenGL extension functions not included in the ARB C header
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These subpackages are also available, but are not imported into this namespace
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by default:
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``pyglet.gl.glext_nv``
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nVidia OpenGL extension functions
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``pyglet.gl.agl``
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AGL (Mac OS X OpenGL context functions)
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``pyglet.gl.glx``
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GLX (Linux OpenGL context functions)
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``pyglet.gl.glxext_arb``
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ARB registered GLX extension functions
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``pyglet.gl.glxext_nv``
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nvidia GLX extension functions
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``pyglet.gl.wgl``
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WGL (Windows OpenGL context functions)
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``pyglet.gl.wglext_arb``
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ARB registered WGL extension functions
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``pyglet.gl.wglext_nv``
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nvidia WGL extension functions
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The information modules are provided for convenience, and are documented
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below.
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'''
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__docformat__ = 'restructuredtext'
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__version__ = '$Id: __init__.py 2175 2008-08-15 04:29:16Z Alex.Holkner $'
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from pyglet.gl.lib import GLException
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from pyglet.gl.gl import *
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from pyglet.gl.glu import *
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from pyglet.gl.glext_arb import *
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from pyglet.gl.glext_missing import *
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from pyglet.gl import gl_info
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import sys as _sys
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_is_epydoc = hasattr(_sys, 'is_epydoc') and _sys.is_epydoc
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# List of contexts currently in use, so we can create new contexts that
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# share objects with. Remember to remove from this list when context is
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# destroyed.
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_contexts = []
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#: The active OpenGL context.
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#:
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#: You can change the current context by calling `Context.set_current`; do not
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#: modify this global.
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#:
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#: :type: `Context`
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#:
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#: :since: pyglet 1.1
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current_context = None
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def get_current_context():
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'''Return the active OpenGL context.
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You can change the current context by calling `Context.set_current`.
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:deprecated: Use `current_context`
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:rtype: `Context`
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:return: the context to which OpenGL commands are directed, or None
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if there is no selected context.
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'''
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return current_context
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class Config(object):
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'''Graphics configuration.
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A GLConfig stores the preferences for OpenGL attributes such as the
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number of auxilliary buffers, size of the colour and depth buffers,
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double buffering, stencilling, multi- and super-sampling, and so on.
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Different platforms support a different set of attributes, so these
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are set with a string key and a value which is integer or boolean.
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See also `pyglet.window.Screen.get_best_config` and
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`pyglet.window.Screen.get_matching_configs`.
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:Ivariables:
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`double_buffer` : bool
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Specify the presence of a back-buffer for every color buffer.
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`stereo` : bool
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Specify the presence of separate left and right buffer sets.
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`buffer_size` : int
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Total bits per sample per color buffer.
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`aux_buffers` : int
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The number of auxilliary color buffers.
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`sample_buffers` : int
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The number of multisample buffers.
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`samples` : int
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The number of samples per pixel, or 0 if there are no multisample
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buffers.
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`red_size` : int
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Bits per sample per buffer devoted to the red component.
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`green_size` : int
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Bits per sample per buffer devoted to the green component.
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`blue_size` : int
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Bits per sample per buffer devoted to the blue component.
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`alpha_size` : int
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Bits per sample per buffer devoted to the alpha component.
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`depth_size` : int
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Bits per sample in the depth buffer.
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`stencil_size` : int
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Bits per sample in the stencil buffer.
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`accum_red_size` : int
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Bits per pixel devoted to the red component in the accumulation
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buffer.
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`accum_green_size` : int
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Bits per pixel devoted to the green component in the accumulation
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buffer.
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`accum_blue_size` : int
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Bits per pixel devoted to the blue component in the accumulation
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buffer.
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`accum_alpha_size` : int
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Bits per pixel devoted to the alpha component in the accumulation
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buffer.
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'''
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_attribute_names = [
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'double_buffer',
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'stereo',
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'buffer_size',
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'aux_buffers',
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'sample_buffers',
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'samples',
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'red_size',
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'green_size',
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'blue_size',
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'alpha_size',
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'depth_size',
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'stencil_size',
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'accum_red_size',
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'accum_green_size',
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'accum_blue_size',
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'accum_alpha_size',
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]
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def __init__(self, **kwargs):
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'''Create a template config with the given attributes.
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Specify attributes as keyword arguments, for example::
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template = Config(double_buffer=True)
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'''
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for name in self._attribute_names:
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if name in kwargs:
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setattr(self, name, kwargs[name])
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else:
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setattr(self, name, None)
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def get_gl_attributes(self):
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'''Return a list of attributes set on this config.
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:rtype: list of tuple (name, value)
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:return: All attributes, with unset attributes having a value of
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``None``.
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'''
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return [(name, getattr(self, name)) for name in self._attribute_names]
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def create_context(self, share):
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'''Create a GL context that satisifies this configuration.
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:Parameters:
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`share` : `Context`
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If not None, a context with which to share objects with.
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:rtype: `Context`
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:return: The new context.
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'''
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raise ConfigException(
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'This config is not complete. Use Screen.get_matching_configs')
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def is_complete(self):
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'''Determine if this config is complete and able to create a context.
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Configs created directly are not complete, they can only serve
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as templates for retrieving a supported config from the system.
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For example, `pyglet.window.Screen.get_matching_configs` returns
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complete configs.
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:rtype: bool
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:return: True if the config is complete and can create a context.
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'''
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return False
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def __repr__(self):
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import pprint
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return '%s(%s)' % (self.__class__.__name__,
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pprint.pformat(self.get_gl_attributes()))
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class ObjectSpace(object):
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def __init__(self):
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# Textures and buffers scheduled for deletion the next time this
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# object space is active.
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self._doomed_textures = []
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self._doomed_buffers = []
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class Context(object):
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'''OpenGL context for drawing.
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Windows in pyglet each have their own GL context. This class boxes
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the context in a platform-independent manner. Applications will have
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no need to deal with contexts directly.
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:Ivariables:
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`object_space` : `ObjectSpace`
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An object which is shared between all contexts that share
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GL objects.
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'''
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#: Context share behaviour indicating that objects should not be
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#: shared with existing contexts.
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CONTEXT_SHARE_NONE = None
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#: Context share behaviour indicating that objects are shared with
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#: the most recently created context (the default).
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CONTEXT_SHARE_EXISTING = 1
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# Used for error checking, True if currently within a glBegin/End block.
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# Ignored if error checking is disabled.
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_gl_begin = False
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# gl_info.GLInfo instance, filled in on first set_current
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_info = None
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# List of (attr, check) for each driver/device-specific workaround that is
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# implemented. The `attr` attribute on this context is set to the result
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# of evaluating `check(gl_info)` the first time this context is used.
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_workaround_checks = [
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# GDI Generic renderer on Windows does not implement
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# GL_UNPACK_ROW_LENGTH correctly.
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('_workaround_unpack_row_length',
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lambda info: info.get_renderer() == 'GDI Generic'),
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# Reportedly segfaults in text_input.py example.
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('_workaround_vbo',
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lambda info: info.get_renderer() == 'ATI Radeon X1600 OpenGL Engine'),
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# Some ATI cards on OS X start drawing from a VBO before it's written
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# to. In these cases pyglet needs to call glFinish() to flush the
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# pipeline after updating a buffer but before rendering.
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('_workaround_vbo_finish',
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lambda info: ('ATI' in info.get_renderer() and
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info.have_version(1, 5) and
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_sys.platform == 'darwin')),
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]
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def __init__(self, context_share=None):
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self.window = None
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_contexts.append(self)
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if context_share:
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assert context_share in _contexts
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self.object_space = context_share.object_space
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else:
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self.object_space = ObjectSpace()
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def __repr__(self):
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return '%s()' % self.__class__.__name__
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def set_current(self):
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global current_context
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assert self in _contexts
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current_context = self
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# Implement workarounds
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if not self._info:
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self._info = gl_info.GLInfo()
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self._info.set_active_context()
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for attr, check in self._workaround_checks:
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setattr(self, attr, check(self._info))
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# Release textures on this context scheduled for deletion
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if self.object_space._doomed_textures:
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textures = self.object_space._doomed_textures
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textures = (GLuint * len(textures))(*textures)
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glDeleteTextures(len(textures), textures)
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self.object_space._doomed_textures = []
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# Release buffers on this context scheduled for deletion
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if self.object_space._doomed_buffers:
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buffers = self.object_space._doomed_buffers
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buffers = (GLuint * len(buffers))(*buffers)
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glDeleteBuffers(len(buffers), buffers)
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self.object_space._doomed_buffers = []
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def destroy(self):
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'''Release the context.
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The context will not be useable after being destroyed. Each platform
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has its own convention for releasing the context and the buffer(s)
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that depend on it in the correct order; this should never be called
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by an application.
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'''
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global current_context
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if current_context is self:
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current_context = None
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gl_info.remove_active_context()
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# Switch back to shadow context.
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if _shadow_window is not None:
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_shadow_window.switch_to()
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_contexts.remove(self)
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def delete_texture(self, texture_id):
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'''Safely delete a texture belonging to this context.
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Usually, the texture is released immediately using
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``glDeleteTextures``, however if another context that does not share
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this context's object space is currently active, the deletion will
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be deferred until an appropriate context is activated.
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:Parameters:
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`texture_id` : int
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The OpenGL name of the texture to delete.
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'''
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if self.object_space is current_context.object_space:
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id = GLuint(texture_id)
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glDeleteTextures(1, id)
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else:
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self.object_space._doomed_textures.append(texture_id)
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def delete_buffer(self, buffer_id):
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'''Safely delete a buffer object belonging to this context.
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This method behaves similarly to `delete_texture`, though for
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``glDeleteBuffers`` instead of ``glDeleteTextures``.
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:Parameters:
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`buffer_id` : int
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The OpenGL name of the buffer to delete.
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:since: pyglet 1.1
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'''
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if self.object_space is current_context.object_space and False:
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id = GLuint(buffer_id)
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glDeleteBuffers(1, id)
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else:
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self.object_space._doomed_buffers.append(buffer_id)
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class ContextException(Exception):
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pass
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class ConfigException(Exception):
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pass
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import pyglet as _pyglet
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if _pyglet.options['debug_texture']:
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_debug_texture_total = 0
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_debug_texture_sizes = {}
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_debug_texture = None
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def _debug_texture_alloc(texture, size):
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global _debug_texture_total
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_debug_texture_sizes[texture] = size
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_debug_texture_total += size
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print '%d (+%d)' % (_debug_texture_total, size)
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def _debug_texture_dealloc(texture):
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global _debug_texture_total
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size = _debug_texture_sizes[texture]
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del _debug_texture_sizes[texture]
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_debug_texture_total -= size
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print '%d (-%d)' % (_debug_texture_total, size)
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_glBindTexture = glBindTexture
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def glBindTexture(target, texture):
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global _debug_texture
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_debug_texture = texture
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return _glBindTexture(target, texture)
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_glTexImage2D = glTexImage2D
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def glTexImage2D(target, level, internalformat, width, height, border,
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format, type, pixels):
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try:
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_debug_texture_dealloc(_debug_texture)
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except KeyError:
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pass
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if internalformat in (1, GL_ALPHA, GL_INTENSITY, GL_LUMINANCE):
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depth = 1
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elif internalformat in (2, GL_RGB16, GL_RGBA16):
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depth = 2
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elif internalformat in (3, GL_RGB):
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depth = 3
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else:
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depth = 4 # Pretty crap assumption
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size = (width + 2 * border) * (height + 2 * border) * depth
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_debug_texture_alloc(_debug_texture, size)
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return _glTexImage2D(target, level, internalformat, width, height,
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border, format, type, pixels)
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_glDeleteTextures = glDeleteTextures
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def glDeleteTextures(n, textures):
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if not hasattr(textures, '__len__'):
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_debug_texture_dealloc(textures.value)
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else:
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for i in range(n):
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_debug_texture_dealloc(textures[i].value)
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return _glDeleteTextures(n, textures)
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def _create_shadow_window():
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global _shadow_window
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import pyglet
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if not pyglet.options['shadow_window'] or _is_epydoc:
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return
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from pyglet.window import Window
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_shadow_window = Window(width=1, height=1, visible=False)
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_shadow_window.switch_to()
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from pyglet import app
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app.windows.remove(_shadow_window)
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_shadow_window = None
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# Import pyglet.window now if it isn't currently being imported (this creates
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# the shadow window).
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if (not _is_epydoc and
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'pyglet.window' not in _sys.modules and
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_pyglet.options['shadow_window']):
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# trickery is for circular import
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_pyglet.gl = _sys.modules[__name__]
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import pyglet.window
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