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364 lines
8 KiB
C
364 lines
8 KiB
C
/*
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* anglechk.c
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*
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* Copyright 2007 Alam Arias <Alam.GBC@gmail.com>
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <stdio.h>
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#ifdef _MSC_VER
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#include <assert.h>
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#endif
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#include "../src/tables.h"
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#define NO_M
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#include "../src/m_fixed.c"
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#define FIXEDPOINTCONV
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// With angle_t,
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// 360 deg = 2^32
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// 45 deg = 2^29
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// 1 deg = 2^29 / 45
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// To convert an angle to a fixed-point number of degrees, then, use
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// fixed = angle * FRACUNIT / ((1<<29) / 45)
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// But, done literally like that, this will overflow.
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// It's mathematically equivalent to
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// fixed = angle * (1<<FRACBITS) / (1<<29) * 45
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// fixed = 45 * angle * (1<<(FRACBITS-29))
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// fixed = 45 * angle * (1>>(29-FRACBITS))
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// fixed = (angle>>(29-FRACBITS)) * 45
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#define ANGLE_TO_FIXED(a) (fixed_t)(((a)>>(29-FRACBITS))*45)
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#define FIXED_TO_ANGLE(x) (angle_t)(((x)/45)<<(29-FRACBITS))
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/*
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Old code that failed if FRACBITS was not 16.
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In particular, the use of FRACUNIT in the definition of ANGLE_F is completely
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wrong. The value wanted actually happens to be 65536 due to the definition
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of angle_t (it's specified so that 360 degrees = 2^32, to take advantage of
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modular arithmetic). That 65536 has nothing whatsoever to do with the setting
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of FRACUNIT.
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#define ANGF_D 8192
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#define ANGF_N 45
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#define ANGLE_F (ANGF_N*FRACUNIT/ANGF_D)
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#define FIXED_TO_ANGLE(x) (angle_t)FixedDiv(x, ANGLE_F) // angle_t = FixedDiv(fixed_t, ANGLE_F)
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#define ANGLE_TO_FIXED(x) FixedMul((fixed_t)(x), ANGLE_F) // fixed_t = FixedMul(angle_t, ANGLE_F)
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*/
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static fixed_t AngleFixed204(angle_t af)
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{
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const fixed_t cfn = 180*FRACUNIT;
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if (af == 0)
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return 0;
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else if (af > ANGLE_180)
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return cfn + ANGLE_TO_FIXED(af - ANGLE_180);
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else if (af < ANGLE_180)
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return ANGLE_TO_FIXED(af);
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else return cfn;
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}
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static inline angle_t FixedAngleC204(fixed_t fa, fixed_t factor)
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{
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#if 0 //FixedMod off?
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const boolean neqda = da < 0, neqfa = fa < 0;
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const fixed_t afactor = abs(factor);
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angle_t ra = ANGLE_180;
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if (factor == 0)
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return FixedAngle204(fa);
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else if (fa == 0)
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return 0;
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if (neqfactor)
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{
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const fixed_t maf = FixedDiv(afactor, ANGLE_F);
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const fixed_t cfn = FixedMul(360*FRACUNIT, afactor), hcfn = (cfn/2);
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const fixed_t fam = FixedMod(fa, cfn);
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if (fam > hcfn)
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ra = ANGLE_180 + (angle_t)FixedMul(fam - hcfn, maf);
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else if (fam < hcfn)
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ra = (angle_t)FixedMul(fam, maf);
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}
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else
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{
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const fixed_t maf = FixedMul(afactor, ANGLE_F);
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const fixed_t cfn = FixedDiv(360*FRACUNIT, afactor), hcfn = (cfn/2);
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const fixed_t fam = FixedMod(fa, cfn);
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if (fam > hcfn)
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ra = ANGLE_180 + (angle_t)FixedDiv(fam - hcfn, maf);
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else if (fam < hcfn)
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ra = (angle_t)FixedDiv(fam, maf);
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}
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if (neqfa)
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ra = ANGLE_MAX-ra;
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return ra;
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#else
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if (factor == 0)
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return FixedAngle(fa);
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else if (factor > 0)
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return (angle_t)((FIXED_TO_FLOAT(fa)/FIXED_TO_FLOAT(factor))*(ANGLE_45/45));
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else
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return (angle_t)((FIXED_TO_FLOAT(fa)*FIXED_TO_FLOAT(-factor))*(ANGLE_45/45));
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#endif
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}
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angle_t FixedAngle(fixed_t fa)
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{
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#if 0 //FixedMod off?
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const boolean neqfa = fa < 0;
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const fixed_t cfn = 180*FRACUNIT;
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const fixed_t fam = FixedMod(fa, 360*FRACUNIT);
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angle_t ra = ANGLE_180;
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if (fa == 0)
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return 0;
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if (fam > cfn)
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ra = ANGLE_180+FIXED_TO_ANGLE(fam-cfn);
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else if (fam < cfn)
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ra = FIXED_TO_ANGLE(fam);
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if (neqfa)
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ra = ANGLE_MAX-ra;
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return ra;
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#else
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return (angle_t)(FIXED_TO_FLOAT(fa)*(ANGLE_45/45));
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#endif
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}
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fixed_t AngleFixed205(angle_t af)
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{
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#ifdef FIXEDPOINTCONV
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angle_t wa = ANGLE_180;
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fixed_t wf = 180*FRACUNIT;
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fixed_t rf = 0*FRACUNIT;
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//const angle_t adj = 0x2000;
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//if (af < adj) // too small to notice
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//return rf;
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while (af)
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{
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while (af < wa)
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{
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wa /= 2;
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wf /= 2;
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}
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rf += wf;
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af -= wa;
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}
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return rf;
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#else
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const fixed_t cfn = 180*FRACUNIT;
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if (af == 0)
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return 0;
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else if (af > ANGLE_180)
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return cfn + ANGLE_TO_FIXED(af - ANGLE_180);
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else if (af < ANGLE_180)
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return ANGLE_TO_FIXED(af);
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else return cfn;
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#endif
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}
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#ifdef FIXEDPOINTCONV
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static FUNCMATH angle_t AngleAdj(const fixed_t fa, const fixed_t wf,
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angle_t ra)
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{
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const angle_t adj = 0x77;
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const boolean fan = fa < 0;
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const fixed_t sl = FixedDiv(fa, wf*2);
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const fixed_t lb = FixedRem(fa, wf*2);
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const fixed_t lo = (wf*2)-lb;
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if (ra == 0)
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{
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if (lb == 0)
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{
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ra = FixedMul(FRACUNIT/512, sl);
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if (ra > FRACUNIT/64)
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return ANGLE_MAX-ra+1;
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return ra;
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}
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else if (lb > 0)
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return ANGLE_MAX-FixedMul(lo*FRACUNIT, adj)+1;
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else
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return ANGLE_MAX-FixedMul(lo*FRACUNIT, adj)+1;
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}
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if (fan)
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return ANGLE_MAX-ra+1;
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else
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return ra;
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}
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#endif
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angle_t FixedAngleC205(fixed_t fa, fixed_t factor)
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{
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#ifdef FIXEDPOINTCONV
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angle_t wa = ANGLE_180;
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fixed_t wf = 180*FRACUNIT;
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angle_t ra = 0;
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const fixed_t cfa = fa;
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fixed_t cwf = wf;
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if (fa == 0)
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return 0;
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if (factor == 0)
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return FixedAngle(fa);
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else if (factor > 0)
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cwf = wf = FixedMul(wf, factor);
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else if (factor < 0)
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cwf = wf = FixedDiv(wf, -factor);
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fa = abs(fa);
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while (fa)
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{
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while (fa < wf)
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{
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wa /= 2;
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wf /= 2;
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}
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ra = ra + wa;
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fa = fa - wf;
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}
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return AngleAdj(cfa, cwf, ra);
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#else
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if (factor == 0)
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return FixedAngle(fa);
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//fa = FixedMod(fa, 360*FRACUNIT);
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if (factor > 0)
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return (angle_t)((FIXED_TO_FLOAT(fa)/FIXED_TO_FLOAT(factor))*(ANGLE_45/45));
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else
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return (angle_t)((FIXED_TO_FLOAT(fa)*FIXED_TO_FLOAT(-factor))*(ANGLE_45/45));
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#endif
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}
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angle_t FixedAngle205(fixed_t fa)
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{
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#ifdef FIXEDPOINTCONV
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angle_t wa = ANGLE_180;
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fixed_t wf = 180*FRACUNIT;
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angle_t ra = 0;
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const fixed_t cfa = fa;
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const fixed_t cwf = wf;
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if (fa == 0)
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return 0;
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fa = abs(fa);
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while (fa)
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{
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while (fa < wf)
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{
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wa /= 2;
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wf /= 2;
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}
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ra = ra + wa;
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fa = fa - wf;
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}
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return AngleAdj(cfa, cwf, ra);
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#else
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//fa = FixedMod(fa, 360*FRACUNIT);
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if (fa == 0)
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return 0;
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return (angle_t)(FIXED_TO_FLOAT(fa)*(ANGLE_45/45));
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#endif
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}
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int main(int argc, char** argv)
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{
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fixed_t f, f204, f205;
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INT64 a;
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angle_t a204, a205;
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fixed_t CF = 40*FRACUNIT;
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int err = 0;
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(void)argc;
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(void)argv;
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err = 0x29; //41
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if (1)
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for (a = 0; a < ANGLE_MAX; a += 0x1)
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{
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f204 = AngleFixed204((angle_t)a);
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f205 = AngleFixed205((angle_t)a);
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if (f204 != f205 && (abs(f204-f205) > err || f204 == 0 || f205 == 0))
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{
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printf("Angle: %u, %d, %d, %d\n", (angle_t)a, f204, f205, f204-f205);
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//err = abs(f204-f205);
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}
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}
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//err = FixedDiv(FRACUNIT, 120*FRACUNIT); // 547
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err = FixedDiv(FRACUNIT, 62*FRACUNIT); //1059
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if (1)
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for (f = FRACUNIT*-720; f < FRACUNIT*720; f += 1)
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{
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a204 = FixedAngle(f);
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a205 = FixedAngle205(f);
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if (a204 != a205 && (abs(a204-a205) > err || a204 == 0 || a205 == 0))
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{
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printf("Fixed: %f, %u, %u, %d\n", FIXED_TO_FLOAT(f), a204, a205, a204-a205);
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err = abs(a204-a205);
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}
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}
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//err = FixedDiv(FRACUNIT, 316*FRACUNIT); //207
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err = FixedDiv(FRACUNIT, 125*FRACUNIT); //526
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if (1)
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for (f = FixedMul(FRACUNIT*-720, CF); f < FixedMul(FRACUNIT*720, CF); f += FRACUNIT/16)
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{
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a204 = FixedAngleC204(f, CF);
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a205 = FixedAngleC205(f, CF);
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if (a204 != a205 && (abs(a204-a205) > err || a204 == 0 || a205 == 0))
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{
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printf("FixedC: %f, %u, %u, %d\n", FIXED_TO_FLOAT(f), a204, a205, a204-a205);
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//err = abs(a204-a205);
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}
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}
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return 0;
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}
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static void *cpu_cpy(void *dest, const void *src, size_t n)
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{
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return memcpy(dest, src, n);
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}
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void *(*M_Memcpy)(void* dest, const void* src, size_t n) = cpu_cpy;
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void I_Error(const char *error, ...)
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{
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(void)error;
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exit(-1);
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}
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