def bilerp(f: ti.template(), pos):
p = float(pos)
I = int(ti.floor(p))
x = p - I
y = 1 - x
ti.static_assert(len(f.meta.shape) == 2)
return (f[I + V(1, 1)] * x[0] * x[1] + f[I + V(1, 0)] * x[0] * y[1] +
f[I + V(0, 0)] * y[0] * y[1] + f[I + V(0, 1)] * y[0] * x[1])
def clamp_index( I : Index , size : Vector) -> Index:
# dim = ti.static(len(I.shape))
# index = []
# for i in range(dim):
# index.append(max(0,min(I[i] , size[i])))
# return index
ti.static_assert(len(size.shape) == 2 and len(I.shape) == 2)
i = max(0,min(int(I[0]) ,size[0] -1))
j = max(0,min(int(I[1]) ,size[1] -1))
return ti.Vector([i,j])
def v4trans(mat, vec, wei):
ti.static_assert(vec.n == 3, vec.n)
if ti.static(vec.m == 1):
return (mat @ ts.vec4(vec, wei)).xyz
tmp = ti.Matrix.zero(float, 4, vec.m)
for i, j in ti.static(ti.ndrange(vec.n, vec.m)):
tmp[i, j] = vec[i, j]
for i in ti.static(range(vec.m)):
tmp[3, i] = wei
tmp = mat @ tmp
ret = ti.Matrix.zero(float, vec.n, vec.m)
for i, j in ti.static(ti.ndrange(vec.n, vec.m)):
ret[i, j] = tmp[i, j]
return ret
def render(self):
self.src.render()
for I in ti.grouped(self.img):
if ti.static(self.attr == 'mid'):
mid = self.src['mid'][I]
color = ts.vec3(abs(mid == 1 or mid == 4 or mid == 6),
abs(mid == 2 or mid == 4 or mid == 5),
abs(mid == 3 or mid == 5 or mid == 6))
self.img[I] = color
elif ti.static(self.attr == 'normal'):
normal = self.src['normal'][I]
self.img[I] = normal * 0.5 + 0.5
elif ti.static(self.attr == 'tangent'):
tangent = self.src['tangent'][I]
self.img[I] = tangent * 0.5 + 0.5
elif ti.static(self.attr == 'position'):
position = self.src['position'][I]
self.img[I] = position * 0.5 + 0.5
elif ti.static(self.attr == 'texcoord'):
texcoord = self.src['texcoord'][I]
self.img[I] = ts.vec3(texcoord, 0.0)
else:
ti.static_assert(0, self.attr)
def vector_to_fast_image(img: ti.template(), out: ti.ext_arr()):
# FIXME: Why is ``for i, j in img:`` slower than:
for i, j in ti.ndrange(*img.shape):
r, g, b = 0, 0, 0
color = img[i, img.shape[1] - 1 - j]
if ti.static(img.dtype in [ti.f32, ti.f64]):
r, g, b = min(255, max(0, int(color * 255)))
else:
ti.static_assert(img.dtype == ti.u8)
r, g, b = color
idx = j * img.shape[0] + i
# We use i32 for |out| since OpenGL and Metal doesn't support u8 types
if ti.static(ti.get_os_name() != 'osx'):
out[idx] = (r << 16) + (g << 8) + b
else:
# What's -16777216?
#
# On Mac, we need to set the alpha channel to 0xff. Since Mac's GUI
# is big-endian, the color is stored in ABGR order, and we need to
# add 0xff000000, which is -16777216 in I32's legit range. (Albeit
# the clarity, adding 0xff000000 doesn't work.)
alpha = -16777216
out[idx] = (b << 16) + (g << 8) + r + alpha
def foo():
ti.static_assert(a == 32)
def func():
ti.static_assert(a == 32)
foo()
def foo():
value = False
ti.static_assert(value, "Oh, no!")
def func():
ti.static_assert(x.dtype == ti.f32)
def func():
ti.static_assert(x.n == 4)
def func():
ti.static_assert(x == 4, "Oh, no!")
def func():
x = 0
ti.static_assert(x) # Expr is not None
def image_at(self, i, j):
ti.static_assert(len(self.img.meta.shape) == 2)
scale = ti.Vector(self.img.meta.shape) / ti.Vector(self.res)
pos = ti.Vector([i, j]) * scale
r, g, b = self._cook(bilerp(self.img, pos))
return int(r), int(g), int(b)
def func3():
ti.static_assert(1 + 1 == 3)
