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|
import struct
import pytest
import moderngl
@pytest.fixture(scope='module')
def prog(ctx_static):
return ctx_static.program(
vertex_shader='''
#version 330
in int a_in;
in int b_in;
in int c_in;
in int d_in;
out int a_out;
out int b_out;
out int c_out;
out int d_out;
void main() {
a_out = a_in * 2;
b_out = b_in * 2;
c_out = c_in * 2;
d_out = d_in * 2;
}
''',
varyings=['a_out', 'b_out', 'c_out', 'd_out']
)
@pytest.fixture(scope='module', autouse=True)
def fbo(ctx_static):
"""Bind an fbo to avoid GL_INVALID_FRAMEBUFFER_OPERATION with transforms"""
fbo = ctx_static.simple_framebuffer((2, 2))
fbo.use()
def test_padding_1(ctx, prog):
buf = ctx.buffer(struct.pack('=ixi12xii', 1, 2, 3, 4))
res = ctx.buffer(reserve=16)
vao = ctx.vertex_array(prog, [
(buf, 'i x i 12x i i', 'a_in', 'b_in', 'c_in', 'd_in'),
])
vao.transform(res, moderngl.POINTS)
a, b, c, d = struct.unpack('=iiii', res.read())
assert ctx.error == 'GL_NO_ERROR'
assert a == 2
assert b == 4
assert c == 6
assert d == 8
def test_padding_2(ctx, prog):
buf = ctx.buffer(struct.pack('=i8xi8xi8xi8x', 1, 2, 3, 4))
res = ctx.buffer(reserve=64)
vao = ctx.vertex_array(prog, [
(buf, 'i 8x', 'a_in'),
])
vao.transform(res, moderngl.POINTS)
assert vao.vertices == 4
a1, a2, a3, a4 = struct.unpack('=i12xi12xi12xi12x', res.read())
assert a1 == 2
assert a2 == 4
assert a3 == 6
assert a4 == 8
def test_padding_3(ctx, prog):
buf = ctx.buffer(struct.pack('=128xiiii', 1, 2, 3, 4))
res = ctx.buffer(reserve=16)
vao = ctx.vertex_array(prog, [
(buf, '128x i i i i', 'a_in', 'b_in', 'c_in', 'd_in'),
])
vao.transform(res, moderngl.POINTS)
a, b, c, d = struct.unpack('=iiii', res.read())
assert a == 2
assert b == 4
assert c == 6
assert d == 8
|
