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
def data_noise_wiggle(cfg):
cfg.aspect_ratio = (1, 1)
cfg.duration = 3
vert = '''
void main()
{
ngl_out_pos = ngl_projection_matrix * ngl_modelview_matrix * ngl_position;
ngl_out_pos += vec4(wiggle, 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(wiggle=ngl.NoiseVec2(octaves=8))
render.update_frag_resources(color=ngl.UniformVec4(value=COLORS['white']))
return render
def data_noise_wiggle(cfg):
cfg.aspect_ratio = (1, 1)
cfg.duration = 3
vert = textwrap.dedent("""\
void main()
{
ngl_out_pos = ngl_projection_matrix * ngl_modelview_matrix * vec4(ngl_position, 1.0);
ngl_out_pos += vec4(wiggle, 0.0, 0.0);
}
""")
frag = textwrap.dedent("""\
void main()
{
ngl_out_color = vec4(color, 1.0);
}
""")
geometry = ngl.Circle(radius=0.25, npoints=6)
program = ngl.Program(vertex=vert, fragment=frag)
render = ngl.Render(geometry, program)
render.update_vert_resources(wiggle=ngl.NoiseVec2(octaves=8))
render.update_frag_resources(color=ngl.UniformVec3(value=COLORS.white))
return render