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/*
==============================================================================
This file is part of the IEM plug-in suite.
Author: Felix Holzmüller
Copyright (c) 2024 - Institute of Electronic Music and Acoustics (IEM)
https://iem.at
The IEM plug-in suite 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.
The IEM plug-in suite 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 software. If not, see <https://www.gnu.org/licenses/>.
==============================================================================
*/
#define _USE_MATH_DEFINES
#include <math.h>
template <typename T>
class OnePoleFilter
{
public:
OnePoleFilter()
{
a0 = 1;
b1 = 0;
z1 = 0;
targetValue = 0;
};
OnePoleFilter (T newa0, T newb1)
{
a0 = newa0;
b1 = newb1;
z1 = 0;
targetValue = 0;
};
void setCoefficients (T newa0, T newb1)
{
a0 = newa0;
b1 = newb1;
reset = true;
};
void setFrequency (T frequency, T sampleRate)
{
b1 = std::exp (-2.0 * M_PI * frequency / sampleRate);
a0 = 1.0 - b1;
reset = true;
};
void setTargetValue (T newTargetValue) { targetValue = newTargetValue; };
T process (bool forceReset = false)
{
if (reset || forceReset)
{
z1 = targetValue;
reset = false;
}
else
{
z1 = a0 * targetValue + b1 * z1;
}
return z1;
}
T process (T newTargetValue, bool forceReset = false)
{
targetValue = newTargetValue;
return process (forceReset);
}
private:
T a0, b1;
T z1;
T targetValue;
bool reset = true;
};
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