def square2circle(cfg, square_color=(0.9, 0.1, 0.3, 1.0), circle_color=(1.0, 1.0, 1.0, 1.0)):
'''Morphing of a square (composed of many vertices) into a circle'''
cfg.duration = 5
cfg.aspect_ratio = (1, 1)
def sqxf(t): # square x coordinates clockwise starting top-left
if t < 1/4.: return t*4
if t < 1/2.: return 1
if t < 3/4.: return 1.-(t-.5)*4
return 0
def sqyf(t): # square y coordinates clockwise starting top-left
if t < 1/4.: return 1
if t < 1/2.: return 1.-(t-.25)*4
if t < 3/4.: return 0
return (t-.75)*4
n = 1024 # number of vertices
s = 1.25 # shapes scale
interp = 'exp_in_out'
center_vertex = [0, 0, 0]
square_vertices = array.array('f', center_vertex)
for i in range(n):
x = (sqxf(i / float(n)) - .5) * s
y = (sqyf(i / float(n)) - .5) * s
square_vertices.extend([x, y, 0])
circle_vertices = array.array('f', center_vertex)
step = 2 * math.pi / float(n)
for i in range(n):
angle = i * step - math.pi/4.
x = math.sin(angle) * .5 * s
y = math.cos(angle) * .5 * s
circle_vertices.extend([x, y, 0])
indices = array.array('H')
for i in range(1, n + 1):
indices.extend([0, i, i + 1])
indices[-1] = 1
vertices_animkf = [
ngl.AnimKeyFrameBuffer(0, square_vertices),
ngl.AnimKeyFrameBuffer(cfg.duration/2., circle_vertices, interp),
ngl.AnimKeyFrameBuffer(cfg.duration, square_vertices, interp),
]
vertices = ngl.AnimatedBufferVec3(vertices_animkf)
color_animkf = [
ngl.AnimKeyFrameVec4(0, square_color),
ngl.AnimKeyFrameVec4(cfg.duration/2., circle_color, interp),
ngl.AnimKeyFrameVec4(cfg.duration, square_color, interp),
]
ucolor = ngl.AnimatedVec4(color_animkf)
geom = ngl.Geometry(vertices, indices=ngl.BufferUShort(data=indices))
p = ngl.Program(vertex=cfg.get_vert('color'), fragment=cfg.get_frag('color'))
render = ngl.Render(geom, p)
render.update_frag_resources(color=ucolor)
return render
def buffer_dove(cfg,
bgcolor1=(.6, 0, 0, 1),
bgcolor2=(.8, .8, 0, 1),
bilinear_filtering=True):
'''Blending of a Render using a Buffer as data source'''
cfg.duration = 3.
# Credits: https://icons8.com/icon/40514/dove
icon_filename = op.join(op.dirname(__file__), 'data', 'icons8-dove.raw')
cfg.files.append(icon_filename)
w, h = (96, 96)
cfg.aspect_ratio = (w, h)
img_buf = ngl.BufferUBVec4(filename=icon_filename, label='icon raw buffer')
img_tex = ngl.Texture2D(data_src=img_buf, width=w, height=h)
if bilinear_filtering:
img_tex.set_mag_filter('linear')
quad = ngl.Quad((-.5, -.5, 0.1), (1, 0, 0), (0, 1, 0))
program = ngl.Program(vertex=cfg.get_vert('texture'),
fragment=cfg.get_frag('texture'))
program.update_vert_out_vars(var_tex0_coord=ngl.IOVec2(),
var_uvcoord=ngl.IOVec2())
render = ngl.Render(quad, program, label='dove')
render.update_frag_resources(tex0=img_tex)
render = ngl.GraphicConfig(render,
blend=True,
blend_src_factor='src_alpha',
blend_dst_factor='one_minus_src_alpha',
blend_src_factor_a='zero',
blend_dst_factor_a='one')
prog_bg = ngl.Program(vertex=cfg.get_vert('color'),
fragment=cfg.get_frag('color'))
shape_bg = ngl.Circle(radius=.6, npoints=256)
render_bg = ngl.Render(shape_bg, prog_bg, label='background')
color_animkf = [
ngl.AnimKeyFrameVec4(0, bgcolor1),
ngl.AnimKeyFrameVec4(cfg.duration / 2.0, bgcolor2),
ngl.AnimKeyFrameVec4(cfg.duration, bgcolor1)
]
ucolor = ngl.AnimatedVec4(color_animkf)
render_bg.update_frag_resources(color=ucolor)
return ngl.Group(children=(render_bg, render))
# Query between times
values = [
anim.evaluate((t_id + 1) * scale) for t_id in range(nb_queries)
]
# Query boundaries and out of them (to trigger a copy instead of a mix)
values += [anim.evaluate(0)]
values += [anim.evaluate(1)]
values += [anim.evaluate(5)]
if hasattr(values[0], '__iter__'):
values = list(itertools.chain(*values))
ret.append(['off%d' % i] + values)
return ret
return test_func
_float_kf_func = lambda t, v, **kw: ngl.AnimKeyFrameFloat(t, v[0], **kw)
_vec2_kf_func = lambda t, v, **kw: ngl.AnimKeyFrameVec2(t, v, **kw)
_vec3_kf_func = lambda t, v, **kw: ngl.AnimKeyFrameVec3(t, v, **kw)
_vec4_kf_func = lambda t, v, **kw: ngl.AnimKeyFrameVec4(t, v, **kw)
_quat_kf_func = lambda t, v, **kw: ngl.AnimKeyFrameQuat(t, v, **kw)
anim_forward_float = _get_anim_func(1, ngl.AnimatedFloat, _float_kf_func)
anim_forward_vec2 = _get_anim_func(2, ngl.AnimatedVec2, _vec2_kf_func)
anim_forward_vec3 = _get_anim_func(3, ngl.AnimatedVec3, _vec3_kf_func)
anim_forward_vec4 = _get_anim_func(4, ngl.AnimatedVec4, _vec4_kf_func)
anim_forward_quat = _get_anim_func(4, ngl.AnimatedQuat, _quat_kf_func)