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|
import struct
import pytest
@pytest.fixture(scope='module', autouse=True)
def prog(ctx_static):
return ctx_static.program(
vertex_shader='''
#version 330
in vec2 in_v;
out vec2 out_v;
uniform Block1 {
float x;
};
uniform Block2 {
float y;
};
uniform Block3 {
float z;
};
void main() {
out_v = in_v * z + vec2(x, y);
}
''',
varyings=['out_v']
)
def test_1(ctx, prog):
buf_v = ctx.buffer(struct.pack('2f', 100.0, 1000.0))
buf_u1 = ctx.buffer(struct.pack('f', 9.5))
buf_u2 = ctx.buffer(struct.pack('f', 4.0))
buf_u3 = ctx.buffer(struct.pack('f', 3.0))
buf_u4 = ctx.buffer(struct.pack('f', 0.0))
buf_r = ctx.buffer(reserve=buf_v.size)
vao = ctx.vertex_array(prog, [
(buf_v, '2f', 'in_v'),
])
assert 'Block1' in prog
assert 'Block2' in prog
assert 'Block3' in prog
assert 'x' not in prog
assert 'y' not in prog
assert 'z' not in prog
prog['Block1'].binding = 2
prog['Block2'].binding = 4
prog['Block3'].binding = 1
buf_u1.bind_to_uniform_block(2)
buf_u2.bind_to_uniform_block(4)
buf_u4.bind_to_uniform_block(1)
vao.transform(buf_r)
a, b = struct.unpack('2f', buf_r.read())
assert pytest.approx(a) == 9.5
assert pytest.approx(b) == 4.0
buf_u3.bind_to_uniform_block(1)
vao.transform(buf_r)
a, b = struct.unpack('2f', buf_r.read())
assert pytest.approx(a) == 309.5
assert pytest.approx(b) == 3004.0
def test_2(ctx, prog):
min_offset = ctx.info['GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT']
u3_len = (min_offset // 4) + 1
u3_data = list(range(u3_len))
buf_v = ctx.buffer(struct.pack('2f', 100.0, 1000.0))
buf_u1 = ctx.buffer(struct.pack('f', 9.5))
buf_u2 = ctx.buffer(struct.pack('f', 4.0))
buf_u3 = ctx.buffer(struct.pack('{:d}f'.format(u3_len), *u3_data))
buf_r = ctx.buffer(reserve=buf_v.size)
vao = ctx.vertex_array(prog, [
(buf_v, '2f', 'in_v'),
])
prog['Block1'].binding = 2
prog['Block2'].binding = 4
prog['Block3'].binding = 1
buf_u1.bind_to_uniform_block(2)
buf_u2.bind_to_uniform_block(4)
buf_u3.bind_to_uniform_block(1, offset=min_offset)
vao.transform(buf_r)
a, b = struct.unpack('2f', buf_r.read())
assert pytest.approx(a) == u3_data[-1] * 100 + 9.5
assert pytest.approx(b) == u3_data[-1] * 1000 + 4.0
buf_u3.bind_to_uniform_block(1, offset=0)
vao.transform(buf_r)
a, b = struct.unpack('2f', buf_r.read())
assert pytest.approx(a) == 9.5
assert pytest.approx(b) == 4.0
|
