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import struct
import pytest
import moderngl
def test_1(ctx):
prog = ctx.program(
vertex_shader='''
#version 330
in vec2 in_v1;
in vec2 in_v2;
out vec2 out_v;
void main() {
out_v = in_v1 + in_v2;
}
''',
varyings=['out_v']
)
buf_v1 = ctx.buffer(struct.pack('8f', 1, 2, 3, 4, 5, 6, 7, 8))
buf_v2 = ctx.buffer(struct.pack('2f', 10, 100))
res = ctx.buffer(reserve=buf_v1.size)
vao = ctx.vertex_array(prog, [
(buf_v1, '2f', 'in_v1'),
(buf_v2, '2f/i', 'in_v2'),
])
vao.transform(res, moderngl.POINTS)
tup = struct.unpack('8f', res.read())
assert pytest.approx(tup[0]) == 11.0
assert pytest.approx(tup[1]) == 102.0
assert pytest.approx(tup[2]) == 13.0
assert pytest.approx(tup[3]) == 104.0
assert pytest.approx(tup[4]) == 15.0
assert pytest.approx(tup[5]) == 106.0
assert pytest.approx(tup[6]) == 17.0
assert pytest.approx(tup[7]) == 108.0
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