patch_cable.h

/*
 * Copyright © 2016-2023 Synthstrom Audible Limited
 *
 * This file is part of The Synthstrom Audible Deluge Firmware.
 *
 * The Synthstrom Audible Deluge Firmware 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 <https://www.gnu.org/licenses/>.
 */
 
#pragma once
 
#include "modulation/automation/auto_param.h"
#include "modulation/params/param_descriptor.h"
#include "util/fixedpoint.h"
#include <cstdint>
 
class Sound;
class ParamManagerForTimeline;
class InstrumentClip;
 
enum class Polarity : uint8_t {
    UNIPOLAR = 0,
    BIPOLAR = 1,
};
Polarity stringToPolarity(std::string_view string);
std::string_view polarityToString(Polarity polarity);
 
class PatchCable {
public:
    PatchCable() = default;
    void setup(PatchSource newFrom, uint8_t newTo, int32_t newAmount);
    bool isActive();
    void initAmount(int32_t value);
    void makeUnusable();
    int32_t toPolarity(int32_t value) {
        // aftertouch is stored unipolar, all others are stored bipolar
        if (from == PatchSource::AFTERTOUCH) {
            if (polarity == Polarity::UNIPOLAR) {
                return value;
            }
            return (value - (std::numeric_limits<int32_t>::max() / 2)) * 2; // Convert from unipolar to bipolar
        }
        // Because unipolar mod wheel and bipolar MPE y share the same mod source we can't convert :(
        if (from == PatchSource::Y || polarity == Polarity::BIPOLAR) {
            return value;
        }
        return (value / 2) + (std::numeric_limits<int32_t>::max() / 2); // Convert from bipolar to unipolar
    }
    [[gnu::always_inline]] [[nodiscard]] int32_t applyRangeAdjustment(int32_t value) const {
        int32_t small = multiply_32x32_rshift32(value, *this->rangeAdjustmentPointer);
        return signed_saturate<32 - 5>(small) << 3; // Not sure if these limits are as wide as they could be...
    }
 
    PatchSource from{PatchSource::NONE};
    Polarity polarity{Polarity::BIPOLAR};
    ParamDescriptor destinationParamDescriptor;
    AutoParam param; // Amounts have to be within +1073741824 and -1073741824
    int32_t const* rangeAdjustmentPointer = nullptr;
};