Source Code for Module glitter.contexts.proxies

 1  """Generic descriptor classes for per-context state. 
 2   
 3  @author: Stephan Wenger 
 4  @date: 2012-02-29 
 5  """ 
 6   
 7  from weakref import WeakKeyDictionary 
 8   
 9  import glitter.raw as _gl 
10  from glitter.utils import hints, bool8, int32, int64, float32, Proxy 
11   
12 -class BooleanProxy(Proxy): 
13 -    def __init__(self, get_args=(), setter=None, set_args=(), shape=()): 
14          super(BooleanProxy, self).__init__(_gl.glGetBooleanv, get_args, setter, set_args, bool8, shape) 
15   
16 -class FloatProxy(Proxy): 
17 -    def __init__(self, get_args=(), setter=None, set_args=(), shape=()): 
18          super(FloatProxy, self).__init__(_gl.glGetFloatv, get_args, setter, set_args, float32, shape) 
19   
20 -class IntegerProxy(Proxy): 
21 -    def __init__(self, get_args=(), setter=None, set_args=(), shape=()): 
22          super(IntegerProxy, self).__init__(_gl.glGetIntegerv, get_args, setter, set_args, int32, shape) 
23   
24 -class Integer64Proxy(Proxy): 
25 -    def __init__(self, get_args=(), setter=None, set_args=(), shape=()): 
26          super(Integer64Proxy, self).__init__(_gl.glGetInteger64v, get_args, setter, set_args, int64, shape) 
27   
28 -class EnableDisableProxy(Proxy): 
29 -    def __init__(self, arg): 
30          super(EnableDisableProxy, self).__init__(name=arg) 
31          self._arg = arg 
32   
33 -    def __get__(self, obj, cls=None): 
34          with obj: 
35              return _gl.glIsEnabled(self._arg) == _gl.GL_TRUE 
36   
37 -    def __set__(self, obj, value): 
38          with obj: 
39              _gl.glEnable(self._arg) if value else _gl.glDisable(self._arg) 
40   
41 -class EnumProxy(Proxy): 
42 -    def __init__(self, enum, arg, setter=None, set_args=()): 
43          super(EnumProxy, self).__init__(enum=enum, getter=_gl.glGetIntegerv, get_args=(arg,), setter=setter, set_args=set_args) 
44   
45 -class HintProxy(EnumProxy): 
46 -    def __init__(self, hint): 
47          super(HintProxy, self).__init__(hints, hint, _gl.glHint, [hint]) 
48   
49 -class StringProxy(Proxy): 
50 -    def __init__(self, arg, count_attr=None): 
51          super(StringProxy, self).__init__(name=arg) 
52          self._arg = arg 
53          self._count_attr = count_attr 
54   
55 -    def __get__(self, obj, cls=None): 
56          if self._count_attr is None: 
57              with obj: 
58                  return _gl.string_at(_gl.glGetString(self._arg)) 
59          else: 
60              with obj: 
61                  _n = _gl.GLint() 
62                  _gl.glGetIntegerv(self._count_attr, _gl.pointer(_n)) 
63                  return [_gl.string_at(_gl.glGetStringi(self._arg, i)) for i in range(_n.value)] 
64   
65 -    def __set__(self, obj, value): 
66          raise AttributeError("can't set attribute") 
67   
68 -class BindingProxy(Proxy): 
69 -    def __init__(self, setter, set_args=()): 
70          super(BindingProxy, self).__init__(setter=setter, set_args=set_args) 
71          self._value = WeakKeyDictionary() 
72   
73 -    def __get__(self, obj, cls=None): 
74          return self._value.get(obj, None) 
75   
76 -    def __set__(self, obj, value=None): 
77          with obj: 
78              old_value = self._value.get(obj, None) 
79              self._value[obj] = value 
80              if old_value is not None and old_value != value and hasattr(old_value, "_on_release") and old_value._on_release is not NotImplemented: 
81                  old_value._on_release() 
82              try: 
83                  self._setter(*([getattr(obj, x) if isinstance(x, basestring) else x for x in self._set_args] + [0 if value is None else value._id])) 
84              except: 
85                  self._value[obj] = old_value 
86                  raise 
87              else: 
88                  if value is not None and value != old_value and hasattr(value, "_on_bind") and value._on_bind is not NotImplemented: 
89                      value._on_bind() 
90