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#!/usr/bin/python
import struct
def half(i):
fs, fe, fm = ((i >> 31) & 0x1, (i >> 23) & 0xff, i & 0x7fffff)
s, e, m = (fs, 0, 0)
if (fe == 0x0):
pass
if ((fe == 0xff) and (fm == 0x0)):
e = 31
elif (fe == 0xff):
m = 1
e = 31
else:
exp = fe - 127;
if (exp < -24):
pass
elif (exp < -14):
temp = 10 - (-14 - exp)
m = 2**temp + (m >> (23 - temp))
elif (exp > 15):
e = 31
else:
e = exp + 15
m = fm >> 13
return ((s << 15) | (e << 10) | m)
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 = [ struct.unpack('<I',struct.pack('f',i))[0] for i in l[offset:offset+4] ]
seq = [ hex(half(i)) for i in seq ]
return "\t" + ", ".join(seq) + ","
def maketable(pix):
l = texgen(pix)
print "static const uint16_t 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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