def data_eval(cfg):
cfg.aspect_ratio = (1, 1)
# Entangled dependencies between evals
t = ngl.Time()
a = ngl.UniformFloat(0.7)
b = ngl.UniformFloat(0.3)
x = ngl.EvalFloat("sin(a - b + t*4)")
x.update_resources(t=t, a=a, b=b)
color = ngl.EvalVec4(
expr0="sat(sin(x + t*4)/2 + wiggle/3)",
expr1="abs(fract(sin(t + a)))",
expr2=None, # re-use expr1
expr3="1",
)
color.update_resources(wiggle=ngl.NoiseFloat(), t=t, a=a, x=x)
vert = textwrap.dedent("""\
void main()
{
ngl_out_pos = ngl_projection_matrix * ngl_modelview_matrix * vec4(ngl_position, 1.0);
}
""")
frag = textwrap.dedent("""\
void main()
{
ngl_out_color = color;
}
""")
program = ngl.Program(vertex=vert, fragment=frag)
geometry = ngl.Quad(corner=(-1, -1, 0), width=(2, 0, 0), height=(0, 2, 0))
render = ngl.Render(geometry, program)
render.update_frag_resources(color=color)
return render
def py_bindings_allow_node():
c = ngl.Camera(eye=(0, 1, 0))
assert c.set_eye(ngl.EvalVec3()) == 0
assert c.set_eye(1, 0, 0) == 0
c = ngl.Camera(eye=ngl.NoiseVec3())
assert c.set_eye(1, 0, 0) == 0
assert c.set_eye(ngl.UniformVec3()) == 0
r = ngl.Rotate(angle=30)
assert r.set_angle(ngl.NoiseFloat()) == 0
assert r.set_angle(-45) == 0
r = ngl.Rotate(angle=ngl.EvalFloat())
assert r.set_angle(90) == 0
assert r.set_angle(ngl.UniformFloat()) == 0
def data_noise_time(cfg):
cfg.aspect_ratio = (1, 1)
cfg.duration = 2
vert = '''
void main()
{
ngl_out_pos = ngl_projection_matrix * ngl_modelview_matrix * ngl_position;
ngl_out_pos += vec4(t - 1., signal, 0.0, 0.0);
}
'''
frag = '''
void main()
{
ngl_out_color = color;
}
'''
geometry = ngl.Circle(radius=0.25, npoints=6)
program = ngl.Program(vertex=vert, fragment=frag)
render = ngl.Render(geometry, program)
render.update_vert_resources(t=ngl.Time(), signal=ngl.NoiseFloat(octaves=8))
render.update_frag_resources(color=ngl.UniformVec4(value=COLORS['white']))
return render
def smptebars_glitch(cfg):
"""SMPTE bars glitching at irregular intervals"""
cfg.duration = 15
cfg.aspect_ratio = (4, 3)
quad = ngl.Quad((-1, -1, 0), (2, 0, 0), (0, 2, 0))
program = ngl.Program(vertex=cfg.get_vert("smptebars"),
fragment=cfg.get_frag("smptebars"))
program.update_vert_out_vars(var_uvcoord=ngl.IOVec2())
render = ngl.Render(quad, program)
freq = cfg.framerate[0] / cfg.framerate[1] + 1
render.update_frag_resources(
active_noise=ngl.NoiseFloat(octaves=1),
active_probability=ngl.UniformFloat(0.4), # glitch 40% of the time
uv_noise_0=ngl.NoiseVec2(amplitude=0.05, frequency=freq,
seed=1000 + 0),
uv_noise_1=ngl.NoiseVec2(amplitude=0.05,
frequency=freq,
seed=1000 + 0x7FFF),
uv_noise_2=ngl.NoiseVec2(amplitude=0.05,
frequency=freq,
seed=1000 + 0xFFFF),
)
return render
