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import struct
import pytest
import moderngl
def test_vao_attribs(ctx):
program = ctx.program(
vertex_shader='''
#version 330
layout(location = 0) in vec4 in_vert;
out vec4 out_vert;
void main() {
out_vert = in_vert;
}
''',
varyings=['out_vert']
)
vbo = ctx.buffer(struct.pack('12f', 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12))
res = ctx.buffer(reserve=struct.calcsize('8f'))
vao = ctx.simple_vertex_array(program, vbo, 'in_vert')
vao.transform(res, moderngl.POINTS, 2)
for a, b in zip(struct.unpack('8f', res.read()), (1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0)):
assert pytest.approx(a) == b
vao.bind(0, 'f', vbo, '4f', offset=4, stride=0, divisor=0)
vao.transform(res, moderngl.POINTS, 2)
for a, b in zip(struct.unpack('8f', res.read()), (2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0)):
assert pytest.approx(a) == b
vao.bind(0, 'f', vbo, '4f', offset=8, stride=20, divisor=0)
vao.transform(res, moderngl.POINTS, 2)
for a, b in zip(struct.unpack('8f', res.read()), (3.0, 4.0, 5.0, 6.0, 8.0, 9.0, 10.0, 11.0)):
assert pytest.approx(a) == b
vao.bind(0, 'f', vbo, '4f', offset=12, stride=0, divisor=1)
vao.transform(res, moderngl.POINTS, 2)
for a, b in zip(struct.unpack('8f', res.read()), (4.0, 5.0, 6.0, 7.0, 4.0, 5.0, 6.0, 7.0)):
assert pytest.approx(a) == b
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