2009-11-14 Colin D Bennet <colin@gibibit.com>
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.
This commit is contained in:
Colin D Bennet
Vladimir 'phcoder' Serbinenko
parent
bd86691a07
commit
85536ab717
4 changed files with 191 additions and 0 deletions
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@ -638,6 +638,12 @@ xnu_uuid_mod_SOURCES = commands/xnu_uuid.c
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xnu_uuid_mod_CFLAGS = $(COMMON_CFLAGS)
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xnu_uuid_mod_LDFLAGS = $(COMMON_LDFLAGS)
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# For trig.mod.
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pkglib_MODULES += trig.mod
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trig_mod_SOURCES = lib/trig.c
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trig_mod_CFLAGS = $(COMMON_CFLAGS)
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trig_mod_LDFLAGS = $(COMMON_LDFLAGS)
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pkglib_MODULES += setjmp.mod
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setjmp_mod_SOURCES = lib/$(target_cpu)/setjmp.S
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setjmp_mod_ASFLAGS = $(COMMON_ASFLAGS)
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44
include/grub/trig.h
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44
include/grub/trig.h
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@ -0,0 +1,44 @@
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/* trig.h - Trigonometric function support. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2008 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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*/
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#ifndef GRUB_TRIG_HEADER
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#define GRUB_TRIG_HEADER 1
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#define GRUB_TRIG_ANGLE_MAX 256
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#define GRUB_TRIG_ANGLE_MASK 255
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#define GRUB_TRIG_FRACTION_SCALE 16384
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extern short grub_trig_sintab[];
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extern short grub_trig_costab[];
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static __inline int
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grub_sin (int x)
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{
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x &= GRUB_TRIG_ANGLE_MASK;
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return grub_trig_sintab[x];
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}
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static __inline int
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grub_cos (int x)
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{
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x &= GRUB_TRIG_ANGLE_MASK;
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return grub_trig_costab[x];
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}
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#endif /* ! GRUB_TRIG_HEADER */
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83
lib/trig.c
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83
lib/trig.c
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@ -0,0 +1,83 @@
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/* trig.c - Trigonometric table definitions. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2008 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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*/
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#include <grub/trig.h>
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/* These tables were generated with `gentrigtables.py'. */
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short grub_trig_sintab[] =
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{
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0,402,804,1205,1606,2006,2404,2801,3196,3590,
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3981,4370,4756,5139,5520,5897,6270,6639,7005,7366,
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7723,8076,8423,8765,9102,9434,9760,10080,10394,10702,
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11003,11297,11585,11866,12140,12406,12665,12916,13160,13395,
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13623,13842,14053,14256,14449,14635,14811,14978,15137,15286,
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15426,15557,15679,15791,15893,15986,16069,16143,16207,16261,
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16305,16340,16364,16379,16384,16379,16364,16340,16305,16261,
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16207,16143,16069,15986,15893,15791,15679,15557,15426,15286,
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15137,14978,14811,14635,14449,14256,14053,13842,13623,13395,
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13160,12916,12665,12406,12140,11866,11585,11297,11003,10702,
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10394,10080,9760,9434,9102,8765,8423,8076,7723,7366,
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7005,6639,6270,5897,5520,5139,4756,4370,3981,3590,
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3196,2801,2404,2006,1606,1205,804,402,0,-402,
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-804,-1205,-1606,-2006,-2404,-2801,-3196,-3590,-3981,-4370,
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-4756,-5139,-5520,-5897,-6270,-6639,-7005,-7366,-7723,-8076,
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-8423,-8765,-9102,-9434,-9760,-10080,-10394,-10702,-11003,-11297,
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-11585,-11866,-12140,-12406,-12665,-12916,-13160,-13395,-13623,-13842,
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-14053,-14256,-14449,-14635,-14811,-14978,-15137,-15286,-15426,-15557,
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-15679,-15791,-15893,-15986,-16069,-16143,-16207,-16261,-16305,-16340,
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-16364,-16379,-16384,-16379,-16364,-16340,-16305,-16261,-16207,-16143,
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-16069,-15986,-15893,-15791,-15679,-15557,-15426,-15286,-15137,-14978,
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-14811,-14635,-14449,-14256,-14053,-13842,-13623,-13395,-13160,-12916,
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-12665,-12406,-12140,-11866,-11585,-11297,-11003,-10702,-10394,-10080,
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-9760,-9434,-9102,-8765,-8423,-8076,-7723,-7366,-7005,-6639,
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-6270,-5897,-5520,-5139,-4756,-4370,-3981,-3590,-3196,-2801,
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-2404,-2006,-1606,-1205,-804,-402
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};
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short grub_trig_costab[] =
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{
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16384,16379,16364,16340,16305,16261,16207,16143,16069,15986,
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15893,15791,15679,15557,15426,15286,15137,14978,14811,14635,
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14449,14256,14053,13842,13623,13395,13160,12916,12665,12406,
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12140,11866,11585,11297,11003,10702,10394,10080,9760,9434,
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9102,8765,8423,8076,7723,7366,7005,6639,6270,5897,
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5520,5139,4756,4370,3981,3590,3196,2801,2404,2006,
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1606,1205,804,402,0,-402,-804,-1205,-1606,-2006,
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-2404,-2801,-3196,-3590,-3981,-4370,-4756,-5139,-5520,-5897,
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-6270,-6639,-7005,-7366,-7723,-8076,-8423,-8765,-9102,-9434,
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-9760,-10080,-10394,-10702,-11003,-11297,-11585,-11866,-12140,-12406,
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-12665,-12916,-13160,-13395,-13623,-13842,-14053,-14256,-14449,-14635,
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-14811,-14978,-15137,-15286,-15426,-15557,-15679,-15791,-15893,-15986,
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-16069,-16143,-16207,-16261,-16305,-16340,-16364,-16379,-16384,-16379,
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-16364,-16340,-16305,-16261,-16207,-16143,-16069,-15986,-15893,-15791,
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-15679,-15557,-15426,-15286,-15137,-14978,-14811,-14635,-14449,-14256,
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-14053,-13842,-13623,-13395,-13160,-12916,-12665,-12406,-12140,-11866,
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-11585,-11297,-11003,-10702,-10394,-10080,-9760,-9434,-9102,-8765,
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-8423,-8076,-7723,-7366,-7005,-6639,-6270,-5897,-5520,-5139,
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-4756,-4370,-3981,-3590,-3196,-2801,-2404,-2006,-1606,-1205,
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-804,-402,0,402,804,1205,1606,2006,2404,2801,
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3196,3590,3981,4370,4756,5139,5520,5897,6270,6639,
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7005,7366,7723,8076,8423,8765,9102,9434,9760,10080,
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10394,10702,11003,11297,11585,11866,12140,12406,12665,12916,
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13160,13395,13623,13842,14053,14256,14449,14635,14811,14978,
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15137,15286,15426,15557,15679,15791,15893,15986,16069,16143,
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16207,16261,16305,16340,16364,16379
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};
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58
maintainance/gentrigtables.py
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58
maintainance/gentrigtables.py
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@ -0,0 +1,58 @@
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#!/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 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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for i in range(256):
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# Convert to an angle in 1/256 of a circle.
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x = i * 2 * pi / 256
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sintab.append(int(round(sin(x) * 16384)))
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costab.append(int(round(cos(x) * 16384)))
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write("#define TRIG_ANGLE_MAX 256\n")
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write("#define TRIG_FRACTION_SCALE 16384\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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