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// -----------------------------------------------------------------------------
//
// Copyright (C) 2004-2009 Fons Adriaensen <fons@kokkinizita.net>
//
// This program 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.
//
// This program 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 this program; if not, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//
// -----------------------------------------------------------------------------
#include <stdio.h>
#include <string.h>
#include <math.h>
#include "virtmic.h"
#define TWOPI 6.283185f
Virtmic::Virtmic (void) :
_azim (0),
_azim1 (0),
_elev (0),
_elev1 (0),
_angle (0),
_angle1 (0),
_direc (0),
_direc1 (0),
_csw (0),
_csx (0),
_csy (0),
_csz (0),
_cdx (0),
_cdy (0)
{
}
Virtmic::~Virtmic (void)
{
}
void Virtmic::process (int n, float *W, float *X, float *Y, float *Z, float *L, float *R)
{
int i, k;
float w, dw, x, dx, y, dy, z, dz;
float ca, sa, ce, se, cv, sv;
float S [80];
float D [80];
while (n)
{
k = (n > 80) ? 64 : n;
if ( circheck (_azim, _azim1)
+ lincheck (_elev, _elev1)
+ lincheck (_angle, _angle1)
+ lincheck (_direc, _direc1))
{
ca = cosf (TWOPI * _azim);
sa = sinf (TWOPI * _azim);
ce = cosf (TWOPI * _elev);
se = sinf (TWOPI * _elev);
cv = cosf (TWOPI * _angle);
sv = sinf (TWOPI * _angle);
w = _csw;
x = _csx;
y = _csy;
z = _csz;
dw = diff (k, w, _csw = 0.707107f * (1 - _direc));
dx = diff (k, x, _csx = _direc * ca * ce * cv);
dy = diff (k, y, _csy = _direc * sa * ce * cv);
dz = diff (k, z, _csz = _direc * cv * se);
for (i = 0; i < k; i++)
{
w += dw;
x += dx;
y += dy;
z += dz;
S [i] = w * W [i] + x * X [i] + y * Y [i] + z * Z [i];
}
x = _cdx;
y = _cdy;
dx = diff (k, x, _cdx = -_direc * sa * sv);
dy = diff (k, y, _cdy = _direc * ca * sv);
for (i = 0; i < k; i++)
{
x += dx;
y += dy;
D [i] = x * X [i] + y * Y [i];
}
}
else
{
for (i = 0; i < k; i++)
{
S [i] = _csw * W [i] + _csx * X [i] + _csy * Y [i] + _csz * Z [i];
D [i] = _cdx * X [i] + _cdy * Y [i];
}
}
for (i = 0; i < k; i++)
{
*L++ = S [i] + D [i];
*R++ = S [i] - D [i];
}
W += k;
X += k;
Y += k;
Z += k;
n -= k;
}
}
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