def velocity_circle_distort_2d(cfg):
cfg.duration = 4.0
cfg.aspect_ratio = (1, 1)
coords = list(equilateral_triangle_coords())
coords.append(coords[0])
pos_kf = [
ngl.AnimKeyFrameVec2(cfg.duration * i / 3.0, pos[0:2], "exp_in_out")
for i, pos in enumerate(coords)
]
anim = ngl.AnimatedVec2(pos_kf)
velocity = ngl.VelocityVec2(anim)
vert = textwrap.dedent("""\
void main()
{
float distort_max = 0.1;
float velocity_l = length(velocity);
float direction_l = length(ngl_position);
vec2 normed_velocity = velocity_l == 0.0 ? vec2(0.0) : -velocity / velocity_l;
vec2 normed_direction = direction_l == 0.0 ? vec2(0.0) : ngl_position.xy / direction_l;
float distort = clamp(dot(normed_velocity, normed_direction) / 2.0 * distort_max, 0.0, 1.0);
vec4 pos = vec4(ngl_position, 1.0) + vec4(translate, 0.0, 0.0) + vec4(-distort * velocity, 0.0, 0.0);
ngl_out_pos = ngl_projection_matrix * ngl_modelview_matrix * pos;
}
""")
geom = ngl.Circle(radius=0.2, npoints=128)
prog = ngl.Program(vertex=vert, fragment=cfg.get_frag("color"))
shape = ngl.Render(geom, prog)
shape.update_frag_resources(color=ngl.UniformVec3(COLORS.white),
opacity=ngl.UniformFloat(1))
shape.update_vert_resources(velocity=velocity, translate=anim)
return shape
def velocity_triangle_rotate(cfg):
cfg.duration = 5.0
cfg.aspect_ratio = (1, 1)
anim_kf = [
ngl.AnimKeyFrameFloat(0, 0),
ngl.AnimKeyFrameFloat(cfg.duration, 360 * 3, "circular_in_out"),
]
anim = ngl.AnimatedFloat(anim_kf)
velocity = ngl.VelocityFloat(anim)
frag = textwrap.dedent("""\
void main()
{
float v = clamp(velocity / 3000., 0.0, 1.0);
ngl_out_color = vec4(v, v / 2.0, 0.0, 1.0);
}
""")
p0, p1, p2 = equilateral_triangle_coords(2.0)
triangle = ngl.RenderColor(COLORS.white, geometry=ngl.Triangle(p0, p1, p2))
triangle = ngl.Rotate(triangle, angle=anim)
prog_c = ngl.Program(vertex=cfg.get_vert("color"), fragment=frag)
circle = ngl.Render(ngl.Circle(radius=1.0, npoints=128), prog_c)
circle.update_frag_resources(velocity=velocity)
return ngl.Group(children=(circle, triangle))
def triangle(cfg, size=4 / 3):
"""Rotating triangle with edge coloring specified in a vertex attribute"""
cfg.duration = 3.0
cfg.aspect_ratio = (1, 1)
colors_data = array.array("f",
[0.0, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0, 0.0, 0.0])
colors_buffer = ngl.BufferVec3(data=colors_data)
p0, p1, p2 = equilateral_triangle_coords(size)
triangle = ngl.Triangle(p0, p1, p2)
p = ngl.Program(fragment=cfg.get_frag("color"),
vertex=cfg.get_vert("triangle"))
p.update_vert_out_vars(color=ngl.IOVec3())
node = ngl.Render(triangle, p)
node.update_attributes(edge_color=colors_buffer)
node.update_frag_resources(opacity=ngl.UniformFloat(1))
animkf = [
ngl.AnimKeyFrameFloat(0, 0),
ngl.AnimKeyFrameFloat(cfg.duration / 3.0, -360 / 3.0, "exp_in_out"),
ngl.AnimKeyFrameFloat(2 * cfg.duration / 3.0, -2 * 360 / 3.0,
"exp_in_out"),
ngl.AnimKeyFrameFloat(cfg.duration, -360, "exp_in_out"),
]
node = ngl.Rotate(node, angle=ngl.AnimatedFloat(animkf))
return node
def shape_triangles_mat4_attribute(cfg):
cfg.aspect_ratio = (1, 1)
p0, p1, p2 = equilateral_triangle_coords(1)
geometry = ngl.Triangle(p0, p1, p2)
matrices = ngl.BufferMat4(data=array.array(
"f",
[
# fmt: off
1.0,
0.0,
0.0,
0.0,
0.0,
1.0,
0.0,
0.0,
0.0,
0.0,
1.0,
0.0,
-0.5,
0.0,
0.0,
1.0,
1.0,
0.0,
0.0,
0.0,
0.0,
1.0,
0.0,
0.0,
0.0,
0.0,
1.0,
0.0,
0.5,
0.0,
0.0,
1.0,
# fmt: on
],
))
program = ngl.Program(
vertex=TRIANGLES_MAT4_ATTRIBUTE_VERT,
fragment=cfg.get_frag("color"),
)
render = ngl.Render(geometry, program, nb_instances=2)
render.update_instance_attributes(matrix=matrices)
render.update_frag_resources(color=ngl.UniformVec3(value=COLORS.orange),
opacity=ngl.UniformFloat(1))
return render
def transform_translate_animated(cfg):
cfg.aspect_ratio = (1, 1)
cfg.duration = 3.0
p0, p1, p2 = equilateral_triangle_coords()
anim = [
ngl.AnimKeyFrameVec3(0, p0),
ngl.AnimKeyFrameVec3(1 * cfg.duration / 3.0, p1),
ngl.AnimKeyFrameVec3(2 * cfg.duration / 3.0, p2),
ngl.AnimKeyFrameVec3(cfg.duration, p0),
]
shape = _transform_shape(cfg)
return ngl.Translate(shape, vector=ngl.AnimatedVec3(anim))
def shape_triangles_mat4_attribute(cfg):
cfg.aspect_ratio = (1, 1)
p0, p1, p2 = equilateral_triangle_coords(1)
geometry = ngl.Triangle(p0, p1, p2)
matrices = ngl.BufferMat4(data=array.array('f', [
1.0,
0.0,
0.0,
0.0,
0.0,
1.0,
0.0,
0.0,
0.0,
0.0,
1.0,
0.0,
-0.5,
0.0,
0.0,
1.0,
1.0,
0.0,
0.0,
0.0,
0.0,
1.0,
0.0,
0.0,
0.0,
0.0,
1.0,
0.0,
0.5,
0.0,
0.0,
1.0,
]))
program = ngl.Program(
vertex=TRIANGLES_MAT4_ATTRIBUTE_VERT,
fragment=cfg.get_frag('color'),
)
render = ngl.Render(geometry, program, nb_instances=2)
render.update_instance_attributes(matrix=matrices)
render.update_uniforms(color=ngl.UniformVec4(value=COLORS['orange']))
return render
def shape_triangle_msaa(cfg, sz=1, color=COLORS.orange):
cfg.aspect_ratio = (1, 1)
p0, p1, p2 = equilateral_triangle_coords(sz)
geometry = ngl.Triangle(p0, p1, p2)
return _render_shape(geometry, color)
