pt1filter.h

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/* antimicrox Gamepad to KB+M event mapper
 * Copyright (C) 2022 Max Maisel <max.maisel@posteo.de>
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */
 
#pragma once
 
class PT1Filter
{
  public:
    PT1Filter(double tau = 1, double rate = 1);
 
    double process(double value);
    inline double getValue() const { return m_value; }
    void reset();
 
    static const double FALLBACK_RATE;
 
  private:
    double m_dt_tau;
    double m_value;
};