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#!/usr/bin/python
def texgen(pix):
tex = []
for i in range(0,pix,4):
a = i / float(pix)
a2 = a ** 2
a3 = a ** 3
w0 = 1 / 6.0 * (-a3 + 3 * a2 + -3 * a + 1)
w1 = 1 / 6.0 * (3 * a3 + -6 * a2 + 4)
w2 = 1 / 6.0 * (-3 * a3 + 3 * a2 + 3 * a + 1)
w3 = 1 / 6.0 * a3
tex.append(-(1 - (w1 / (w0 + w1)) + a))
tex.append(1 + (w3 / (w2 + w3)) - a)
tex.append(w0 + w1)
tex.append(w2 + w3)
return tex
def printrow(l, offset):
seq = [ str(i) for i in l[offset:offset+4] ]
return "\t" + ", ".join(seq) + ","
def maketable(pix):
l = texgen(pix)
print "static const float bicubic_tex_" + str(pix) + "[] = {"
for i in range(0, pix, 4):
print printrow(l, i)
print "\t0 };\n"
maketable(512)
maketable(2048)
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