60 lines
1.8 KiB
Python
60 lines
1.8 KiB
Python
#!/usr/bin/python
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# Script to generate trigonometric function tables.
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#
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# GRUB -- GRand Unified Bootloader
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# Copyright (C) 2008, 2009 Free Software Foundation, Inc.
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#
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# GRUB is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# GRUB is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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from math import *
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from sys import stdout
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def write(x):
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stdout.write(x)
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def writeTable(arr, name):
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indent = ' ' * 4
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write("short ")
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write(name)
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write("[] =\n{\n")
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write(indent)
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for i in range(len(arr)):
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if i != 0:
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write(",")
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if i % 10 == 0:
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write("\n")
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write(indent)
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write("%d" % arr[i])
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write("\n};\n")
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def main():
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sintab = []
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costab = []
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angle_max = 256
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fraction_scale = 16384
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for i in range(angle_max):
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# Convert to an angle in 1/256 of a circle.
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x = i * 2 * pi / angle_max
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sintab.append(int(round(sin(x) * fraction_scale)))
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costab.append(int(round(cos(x) * fraction_scale)))
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write("#define TRIG_ANGLE_MAX " + str (angle_max) + "\n")
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write("#define TRIG_FRACTION_SCALE " + str (fraction_scale) + "\n")
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writeTable(sintab, "sintab")
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writeTable(costab, "costab")
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if __name__ == "__main__":
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main()
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# vim:ai et sw=4 ts=4
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