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