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import moderngl
import pytest
import numpy as np
@pytest.fixture(scope='module')
def prog(ctx_static):
return ctx_static.program(
vertex_shader='''
#version 330
in vec2 in_vert;
void main() {
gl_Position = vec4(in_vert, 0.0, 1.0);
}
''',
fragment_shader='''
#version 330
out vec4 fragColor;
uniform vec4 color;
void main() {
fragColor = color;
}
''',
)
@pytest.fixture(scope='module')
def vao(ctx_static, prog):
quad = [
-1.0, 1.0,
-1.0, -1.0,
1.0, 1.0,
1.0, -1.0,
]
vbo = ctx_static.buffer(np.array(quad, dtype='f4'))
return ctx_static.simple_vertex_array(prog, vbo, 'in_vert')
def create_fbo(ctx, size, components=3):
fbo = ctx.framebuffer(
color_attachments=[ctx.texture(size, components)],
)
fbo.clear()
return fbo
def test_default_value(ctx):
"""Ensure default value of the scissor matches the framebuffer size"""
size = (16, 32)
fbo = create_fbo(ctx, size)
assert fbo.scissor == (0, 0, *size)
def test_reset_scissor(ctx):
"""We should be able to reset scissor with `None`"""
size = (16, 32)
fbo = create_fbo(ctx, size)
new_val = 2, 2, 14, 30
fbo.scissor = new_val
assert fbo.scissor == new_val
fbo.scissor = None
assert fbo.scissor == (0, 0, *size)
def test_render(ctx, prog, vao):
"""Render different color to the four corners of the fbo using scissor"""
size = (4, 4)
fbo = create_fbo(ctx, size)
fbo.use()
# upper left (red)
fbo.scissor = 0, 2, 2, 2
prog['color'].value = 1.0, 0.0, 0.0, 0.0
vao.render(mode=moderngl.TRIANGLE_STRIP)
# upper right (green)
fbo.scissor = 2, 2, 2, 2
prog['color'].value = 0.0, 1.0, 0.0, 0.0
vao.render(mode=moderngl.TRIANGLE_STRIP)
# lower left (green)
fbo.scissor = 0, 0, 2, 2
prog['color'].value = 0.0, 0.0, 1.0, 0.0
vao.render(mode=moderngl.TRIANGLE_STRIP)
# lower right (green)
fbo.scissor = 2, 0, 2, 2
prog['color'].value = 1.0, 1.0, 1.0, 1.0
vao.render(mode=moderngl.TRIANGLE_STRIP)
data = fbo.read()
# Note that the data is flipped horizontally
expected = (
b'\x00\x00\xff'b'\x00\x00\xff'b'\xff\xff\xff'b'\xff\xff\xff'
b'\x00\x00\xff'b'\x00\x00\xff'b'\xff\xff\xff'b'\xff\xff\xff'
b'\xff\x00\x00'b'\xff\x00\x00'b'\x00\xff\x00'b'\x00\xff\x00'
b'\xff\x00\x00'b'\xff\x00\x00'b'\x00\xff\x00'b'\x00\xff\x00'
)
assert data == expected
def test_clear(ctx):
"""Ensure fbo clearing works with scissoring"""
size = (4, 4)
fbo = create_fbo(ctx, size)
fbo.use()
# upper left (red)
fbo.scissor = 0, 2, 2, 2
fbo.clear(1.0, 0.0, 0.0, 0.0)
# upper right (green)
fbo.scissor = 2, 2, 2, 2
fbo.clear(0.0, 1.0, 0.0, 0.0)
# lower left (green)
fbo.scissor = 0, 0, 2, 2
fbo.clear(0.0, 0.0, 1.0, 0.0)
# lower right (green)
fbo.scissor = 2, 0, 2, 2
fbo.clear(1.0, 1.0, 1.0, 1.0)
data = fbo.read()
# Note that the data is flipped horizontally
expected = (
b'\x00\x00\xff'b'\x00\x00\xff'b'\xff\xff\xff'b'\xff\xff\xff'
b'\x00\x00\xff'b'\x00\x00\xff'b'\xff\xff\xff'b'\xff\xff\xff'
b'\xff\x00\x00'b'\xff\x00\x00'b'\x00\xff\x00'b'\x00\xff\x00'
b'\xff\x00\x00'b'\xff\x00\x00'b'\x00\xff\x00'b'\x00\xff\x00'
)
assert data == expected
def test_scissor_leak(ctx):
"""Make sure we don't leak scissor values to other framebuffers"""
size = 2, 2
fbo1 = create_fbo(ctx, size, components=4)
fbo2 = create_fbo(ctx, size, components=4)
fbo1.scissor = 0, 0, 1, 1
fbo2.scissor = 1, 1, 1, 1
fbo1.clear(color=(1.0, 0.0, 0.0, 0.0))
fbo2.clear(color=(0.0, 1.0, 0.0, 0.0))
assert fbo1.read() == b'\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
assert fbo2.read() == b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\x00'
def test_clear_with_viewport(ctx):
"""Clearing with viewport take presence over scissor"""
size = 2, 1
fbo = create_fbo(ctx, size)
fbo.scissor = 1, 0, 1, 1
fbo.clear(color=(1.0, 1.0, 1.0, 1.0), viewport=(0, 0, 1, 1))
assert fbo.read() == b'\xff\xff\xff\x00\x00\x00'
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