Source Code for Module glitter.contexts.multiproxies

 1  """Descriptors for per-context state with complicated setters. 
 2   
 3  @author: Stephan Wenger 
 4  @date: 2012-02-29 
 5  """ 
 6   
 7  import glitter.raw as _gl 
 8  from glitter.utils import blend_functions, blend_equations 
 9   
10 -class BlendFuncProxy(object): 
11 -    def __init__(self, arg): 
12          self._arg = arg 
13   
14 -    def __get__(self, obj, cls=None): 
15          _value = _gl.GLint() 
16          with obj: 
17              _gl.glGetIntegerv(self._arg, _gl.pointer(_value)) 
18          return blend_functions[_value.value] 
19   
20 -    def __set__(self, obj, value): 
21          src_rgb = blend_functions(value) if self._arg == _gl.GL_BLEND_SRC_RGB else obj.blend_src_rgb 
22          dst_rgb = blend_functions(value) if self._arg == _gl.GL_BLEND_DST_RGB else obj.blend_dst_rgb 
23          src_alpha = blend_functions(value) if self._arg == _gl.GL_BLEND_SRC_ALPHA else obj.blend_src_alpha 
24          dst_alpha = blend_functions(value) if self._arg == _gl.GL_BLEND_DST_ALPHA else obj.blend_dst_alpha 
25          with obj: 
26              _gl.glBlendFuncSeparate(src_rgb._value, dst_rgb._value, src_alpha._value, dst_alpha._value) 
27   
28 -    def __repr__(self): 
29          return "proxy for %s" % self._arg 
30   
31 -class BlendEquationProxy(object): 
32 -    def __init__(self, arg): 
33          self._arg = arg 
34   
35 -    def __get__(self, obj, cls=None): 
36          _value = _gl.GLint() 
37          with obj: 
38              _gl.glGetIntegerv(self._arg, _gl.pointer(_value)) 
39          return blend_equations[_value.value] 
40   
41 -    def __set__(self, obj, value): 
42          mode_rgb = blend_equations(value) if self._arg == _gl.GL_BLEND_EQUATION_RGB else obj.blend_equation_rgb 
43          mode_alpha = blend_equations(value) if self._arg == _gl.GL_BLEND_EQUATION_ALPHA else obj.blend_equation_alpha 
44          with obj: 
45              _gl.glBlendEquationSeparate(mode_rgb._value, mode_alpha._value) 
46   
47 -    def __repr__(self): 
48          return "proxy for %s" % self._arg 
49   
50 -class PolygonOffsetProxy(object): 
51 -    def __init__(self, arg): 
52          self._arg = arg 
53   
54 -    def __get__(self, obj, cls=None): 
55          _value = _gl.GLfloat() 
56          with obj: 
57              _gl.glGetFloatv(self._arg, _gl.pointer(_value)) 
58          return _value.value 
59   
60 -    def __set__(self, obj, value): 
61          factor = value if self._arg == _gl.GL_POLYGON_OFFSET_FACTOR else obj.polygon_offset_factor 
62          units = value if self._arg == _gl.GL_POLYGON_OFFSET_UNITS else obj.polygon_offset_units 
63          with obj: 
64              _gl.glPolygonOffset(factor, units) 
65   
66 -    def __repr__(self): 
67          return "proxy for %s" % self._arg 
68