1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
Query
=====
.. py:class:: Query
Returned by :py:meth:`Context.query`
This class represents a Query object.
Attributes
----------
.. py:attribute:: Query.samples
:type: int
The number of samples passed.
.. py:attribute:: Query.primitives
:type: int
The number of primitives generated.
.. py:attribute:: Query.elapsed
:type: int
The time elapsed in nanoseconds.
.. py:attribute:: Query.crender
:type: ConditionalRender
.. py:attribute:: Query.ctx
:type: Context
The context this object belongs to
.. py:attribute:: Query.extra
:type: Any
User defined data.
Examples
--------
.. rubric:: Simple query example
.. code-block:: python
:linenos:
import moderngl
import numpy as np
ctx = moderngl.create_standalone_context()
prog = ctx.program(
vertex_shader='''
#version 330
in vec2 in_vert;
void main() {
gl_Position = vec4(in_vert, 0.0, 1.0);
}
''',
fragment_shader='''
#version 330
out vec4 color;
void main() {
color = vec4(1.0, 0.0, 0.0, 1.0);
}
''',
)
vertices = np.array([
0.0, 0.0,
1.0, 0.0,
0.0, 1.0,
], dtype='f4')
vbo = ctx.buffer(vertices.tobytes())
vao = ctx.simple_vertex_array(prog, vbo, 'in_vert')
fbo = ctx.simple_framebuffer((64, 64))
fbo.use()
query = ctx.query(samples=True, time=True)
with query:
vao.render()
print('It took %d nanoseconds' % query.elapsed)
print('to render %d samples' % query.samples)
.. rubric:: Output
.. code-block:: text
It took 13529 nanoseconds
to render 496 samples
.. toctree::
:maxdepth: 1
conditional_render.rst
|
