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/*
* lingot, a musical instrument tuner.
*
* Copyright (C) 2004-2011 Ibán Cereijo Graña, Jairo Chapela Martínez.
*
* This file is part of lingot.
*
* lingot 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 2 of the License, or
* (at your option) any later version.
*
* lingot 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 lingot; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "lingot-complex.h"
/**
* addition. All parameters are overlapables.
*/
void lingot_complex_add(LingotComplex* a, LingotComplex* b, LingotComplex* c) {
c->r = a->r + b->r;
c->i = a->i + b->i;
}
/**
* substraction. All parameters are overlapables.
*/
void lingot_complex_sub(LingotComplex* a, LingotComplex* b, LingotComplex* c) {
c->r = a->r - b->r;
c->i = a->i - b->i;
}
/**
* multiplication. All parameters are overlapables.
*/
void lingot_complex_mul(LingotComplex* a, LingotComplex* b, LingotComplex* c) {
if ((c != a) && (c != b)) {
c->r = a->r * b->r - a->i * b->i;
c->i = a->i * b->r + a->r * b->i;
} else {
LingotComplex r;
r.r = a->r * b->r - a->i * b->i;
r.i = a->i * b->r + a->r * b->i;
*c = r;
}
}
/**
* division. All parameters are overlapables.
*/
void lingot_complex_div(LingotComplex* a, LingotComplex* b, LingotComplex* c) {
FLT bm2 = b->r * b->r + b->i * b->i;
if ((c != a) && (c != b)) {
c->r = (a->r * b->r + a->i * b->i) / bm2;
c->i = (a->i * b->r - a->r * b->i) / bm2;
} else {
LingotComplex r;
r.r = (a->r * b->r + a->i * b->i) / bm2;
r.i = (a->i * b->r - a->r * b->i) / bm2;
*c = r;
}
}
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