99 lines
2.8 KiB
Python
99 lines
2.8 KiB
Python
import ctypes
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from ctypes import *
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import pyglet
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from pyglet.gl.lib import missing_function, decorate_function
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from pyglet.util import asbytes
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__all__ = ['link_GL', 'link_WGL']
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_debug_trace = pyglet.options['debug_trace']
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gl_lib = ctypes.windll.opengl32
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wgl_lib = gl_lib
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if _debug_trace:
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from pyglet.lib import _TraceLibrary
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gl_lib = _TraceLibrary(gl_lib)
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wgl_lib = _TraceLibrary(wgl_lib)
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try:
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wglGetProcAddress = wgl_lib.wglGetProcAddress
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wglGetProcAddress.restype = CFUNCTYPE(POINTER(c_int))
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wglGetProcAddress.argtypes = [c_char_p]
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_have_get_proc_address = True
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except AttributeError:
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_have_get_proc_address = False
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class_slots = ['name', 'requires', 'suggestions', 'ftype', 'func']
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def makeWGLFunction(func):
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class WGLFunction:
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__slots__ = class_slots
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__call__ = func
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return WGLFunction
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class WGLFunctionProxy:
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__slots__ = class_slots
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def __init__(self, name, ftype, requires, suggestions):
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assert _have_get_proc_address
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self.name = name
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self.ftype = ftype
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self.requires = requires
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self.suggestions = suggestions
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self.func = None
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def __call__(self, *args, **kwargs):
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from pyglet.gl import current_context
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if not current_context:
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raise Exception(
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'Call to function "%s" before GL context created' % self.name)
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address = wglGetProcAddress(asbytes(self.name))
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if cast(address, POINTER(c_int)): # check cast because address is func
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self.func = cast(address, self.ftype)
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decorate_function(self.func, self.name)
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else:
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self.func = missing_function(
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self.name, self.requires, self.suggestions)
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self.__class__ = makeWGLFunction(self.func)
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return self.func(*args, **kwargs)
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def link_GL(name, restype, argtypes, requires=None, suggestions=None):
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try:
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func = getattr(gl_lib, name)
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func.restype = restype
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func.argtypes = argtypes
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decorate_function(func, name)
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return func
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except AttributeError:
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# Not in opengl32.dll. Try and get a pointer from WGL.
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try:
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fargs = (restype,) + tuple(argtypes)
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ftype = ctypes.WINFUNCTYPE(*fargs)
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if _have_get_proc_address:
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from pyglet.gl import gl_info
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if gl_info.have_context():
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address = wglGetProcAddress(name)
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if address:
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func = cast(address, ftype)
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decorate_function(func, name)
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return func
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else:
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# Insert proxy until we have a context
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return WGLFunctionProxy(name, ftype, requires, suggestions)
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except:
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pass
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return missing_function(name, requires, suggestions)
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link_WGL = link_GL
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