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
|
import struct
import pytest
import moderngl
def test_1(ctx):
prog = ctx.program(
vertex_shader='''
#version 330
in mat2 in_m;
in vec2 in_v;
out vec2 out_v;
uniform float mult;
void main() {
out_v = in_m * in_v * mult;
}
''',
varyings=['out_v']
)
buf_m = ctx.buffer(struct.pack('4f', 1, 1, 1, 2))
buf_v = ctx.buffer(struct.pack('2f', 4, 7))
res = ctx.buffer(reserve=buf_v.size)
vao = ctx.vertex_array(prog, [
(buf_m, '4f', 'in_m'),
(buf_v, '2f', 'in_v'),
])
prog['mult'].value = 0.0
vao.transform(res, moderngl.POINTS)
x, y = struct.unpack('2f', res.read())
assert pytest.approx(x) == 0.0
assert pytest.approx(y) == 0.0
prog['mult'].value = 1.0
vao.transform(res, moderngl.POINTS)
x, y = struct.unpack('2f', res.read())
assert pytest.approx(x) == 11.0
assert pytest.approx(y) == 18.0
prog['mult'].value = 2.0
vao.transform(res, moderngl.POINTS)
x, y = struct.unpack('2f', res.read())
assert pytest.approx(x) == 22.0
assert pytest.approx(y) == 36.0
|
