Source Code for Module glitter.misc.query

 1  """Query classes. 
 2   
 3  @warning: The C{Query} class is currently untested. 
 4   
 5  @author: Stephan Wenger 
 6  @date: 2012-02-29 
 7  """ 
 8   
 9  import glitter.raw as _gl 
10  from glitter.utils import ManagedObject, BindReleaseObject 
11   
12 -class Query(ManagedObject, BindReleaseObject): 
13      _generate_id = _gl.glGenQueries 
14      _delete_id = _gl.glDeleteQueries 
15      _db = "queries" 
16   
17 -    def __init__(self, context=None): 
18          if any(x is NotImplemented for x in (self._target,)): 
19              raise TypeError("%s is abstract" % self.__class__.__name__) 
20          super(Query, self).__init__(context=context) 
21          if self._counter_bits == 0: 
22              raise RuntimeError("%s not supported" % self.__class__.__name__) 
23   
24 -    def bind(self): 
25          _gl.glBeginQuery(self._id) 
26   
27 -    def release(self): 
28          _gl.glEndQuery() 
29   
30      @property 
31 -    def _current_query(self): 
32          _current_query = _gl.GLint() 
33          _gl.glGetQueryiv(self._target, _gl.GL_CURRENT_QUERY, _gl.pointer(_current_query)) 
34          return _current_query.value 
35   
36      @property 
37 -    def _counter_bits(self): 
38          _counter_bits = _gl.GLint() 
39          _gl.glGetQueryiv(self._target, _gl.GL_QUERY_COUNTER_BITS, _gl.pointer(_counter_bits)) 
40          return _counter_bits.value 
41   
42      @property 
43 -    def result_available(self): 
44          _result_available = _gl.GLint() 
45          _gl.glGetQueryObjectiv(self._id, _gl.GL_QUERY_RESULT_AVAILABLE, _gl.pointer(_result_available)) 
46          return bool(_result_available.value) 
47   
48      @property 
49 -    def result(self): 
50          if self._counter_bits <= 32: 
51              _result = _gl.GLuint() 
52              _gl.glGetQueryObjectuiv(self._id, _gl.GL_QUERY_RESULT_AVAILABLE, _gl.pointer(_result)) 
53          else: 
54              _result = _gl.GLuint64() 
55              _gl.glGetQueryObjectui64v(self._id, _gl.GL_QUERY_RESULT_AVAILABLE, _gl.pointer(_result)) 
56          return _result.value 
57   
58 -class SamplesPassedQuery(Query): 
59      """@todo: Wrap C{glBeginConditionalRender} and C{glEndConditionalRender}.""" 
60      _target = _gl.GL_SAMPLES_PASSED 
61   
62 -class AnySamplesPassedQuery(Query): 
63      """@todo: Wrap C{glBeginConditionalRender} and C{glEndConditionalRender}.""" 
64      _target = _gl.GL_ANY_SAMPLES_PASSED 
65      result = property(lambda self: bool(Query.result.fget(self))) 
66   
67 -class PrimitivesGeneratedQuery(Query): 
68      _target = _gl.GL_PRIMITIVES_GENERATED 
69   
70 -class TransformFeedbackPrimitivesWrittenQuery(Query): 
71      _target = _gl.GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN 
72   
73 -class TimeElapsedQuery(Query): 
74      _target = _gl.GL_TIME_ELAPSED 
75   
76  __all__ = [ 
77      "Query", 
78      "SamplesPassedQuery", 
79      "AnySamplesPassedQuery", 
80      "PrimitivesGeneratedQuery", 
81      "TransformFeedbackPrimitivesWrittenQuery", 
82      "TimeElapsedQuery", 
83  ] 
84