85536ab717
Trigonometry support. * include/grub/trig.h: New file. * lib/trig.c: Likewise. * maintainance/gentrigtables.py: Likewise. * conf/common.rmk (pkglib_MODULES): Add trig.mod. (trig_mod_SOURCES): New variable. (trig_mod_CFLAGS): Likewise. (trig_mod_LDFLAGS): Likewise.
58 lines
1.6 KiB
Python
58 lines
1.6 KiB
Python
#!/usr/bin/python
|
|
# Script to generate trigonometric function tables.
|
|
#
|
|
# GRUB -- GRand Unified Bootloader
|
|
# Copyright (C) 2008 Free Software Foundation, Inc.
|
|
#
|
|
# GRUB is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License as published by
|
|
# the Free Software Foundation, either version 3 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# GRUB is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with GRUB. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
from math import *
|
|
from sys import stdout
|
|
|
|
def write(x):
|
|
stdout.write(x)
|
|
|
|
def writeTable(arr, name):
|
|
indent = ' ' * 4
|
|
write("short ")
|
|
write(name)
|
|
write("[] =\n{\n")
|
|
write(indent)
|
|
for i in range(len(arr)):
|
|
if i != 0:
|
|
write(",")
|
|
if i % 10 == 0:
|
|
write("\n")
|
|
write(indent)
|
|
write("%d" % arr[i])
|
|
write("\n};\n")
|
|
|
|
def main():
|
|
sintab = []
|
|
costab = []
|
|
for i in range(256):
|
|
# Convert to an angle in 1/256 of a circle.
|
|
x = i * 2 * pi / 256
|
|
sintab.append(int(round(sin(x) * 16384)))
|
|
costab.append(int(round(cos(x) * 16384)))
|
|
|
|
write("#define TRIG_ANGLE_MAX 256\n")
|
|
write("#define TRIG_FRACTION_SCALE 16384\n")
|
|
writeTable(sintab, "sintab")
|
|
writeTable(costab, "costab")
|
|
|
|
if __name__ == "__main__":
|
|
main()
|
|
|
|
# vim:ai et sw=4 ts=4
|