NodeMap.hpp

/*
 * Klang – a node+text-based synthesizer library
 *
 * This file is part of the *wellen* library (https://github.com/dennisppaul/wellen).
 * Copyright (c) 2022 Dennis P Paul.
 *
 * This library 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, version 3.
 *
 * This library 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/>.
 */

/**
 *       [ NODE_MAP            ]
 *       +---------------------+
 *       |                     |
 * IN00--| SIGNAL       SIGNAL |--OUT00
 *       |                     |
 *       +---------------------+
 *
 *       @description(
 *          maps a value from an input range to an output range.
 *       )
 */

#ifndef NodeMap_hpp
#define NodeMap_hpp

#include "NodeMap.hpp"

namespace klang {
    class NodeMap : public NodeKernelBlock {
    public:
        void set_in_min(float pInMin) {
            mInMin = pInMin;
        }

        void set_in_max(float pInMax) {
            mInMax = pInMax;
        }

        void set_out_min(float pOutMin) {
            mOutMin = pOutMin;
        }

        void set_out_max(float pOutMax) {
            mOutMax = pOutMax;
        }

        void set_in_min(float pInMin, float pInMax, float pOutMin, float pOutMax) {
            mInMin  = pInMin;
            mInMax  = pInMax;
            mOutMin = pOutMin;
            mOutMax = pOutMax;
        }

        void set_command(KLANG_CMD_TYPE pCommand, KLANG_CMD_TYPE* pPayLoad) {
            switch (pCommand) {
                case KLANG_SET_IN_MIN_F32:
                    set_in_min(KlangMath::FLOAT_32(pPayLoad));
                    break;
                case KLANG_SET_IN_MAX_F32:
                    set_in_max(KlangMath::FLOAT_32(pPayLoad));
                    break;
                case KLANG_SET_OUT_MIN_F32:
                    set_out_min(KlangMath::FLOAT_32(pPayLoad));
                    break;
                case KLANG_SET_OUT_MAX_F32:
                    set_out_max(KlangMath::FLOAT_32(pPayLoad));
                    break;
            }
        }

    protected:
        void kernel(float* s) {
            const float r = (mInMax - mInMin) / (mOutMax - mOutMin);
            for (uint16_t i = 0; i < KLANG_SAMPLES_PER_AUDIO_BLOCK; i++) {
                const float a = s[i] - mInMin;
                const float b = r + mOutMin;
                s[i]          = a / b;
            }
        }

    private:
        float mInMin  = 0.0;
        float mInMax  = 1.0;
        float mOutMin = 0.0;
        float mOutMax = 1.0;
    };
}  // namespace klang

#endif /* NodeMap_hpp */