mirror of
https://github.com/eried/portapack-mayhem.git
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78 lines
2.0 KiB
C++
78 lines
2.0 KiB
C++
/*
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* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
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* Copyright (C) 2017 Furrtek
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*
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* This file is part of PortaPack.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#include "tone_gen.hpp"
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#include "sine_table_int8.hpp"
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int32_t ToneGen::tone_from_sine_table() {
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int32_t tone_sample = sine_table_i8[(tone_phase_ & 0xFF000000U) >> 24] << 24;
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tone_phase_ += delta_;
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return tone_sample;
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}
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int32_t ToneGen::tone_square() {
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int32_t tone_sample = 0;
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if(tone_phase_ < (UINT32_MAX / 2)) {
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tone_sample = INT32_MAX;
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}
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else {
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tone_sample = INT32_MIN;
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}
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tone_phase_ += delta_;
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return tone_sample;
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}
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void ToneGen::configure(const uint32_t delta, const float tone_mix_weight) {
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delta_ = delta;
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tone_mix_weight_ = tone_mix_weight;
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input_mix_weight_ = 1.0 - tone_mix_weight;
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current_tone_type_ = sine;
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}
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void ToneGen::configure(const uint32_t delta, const float tone_mix_weight, const tone_type tone_type) {
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delta_ = delta;
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tone_mix_weight_ = tone_mix_weight;
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input_mix_weight_ = 1.0 - tone_mix_weight;
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current_tone_type_ = tone_type;
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}
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int32_t ToneGen::process(const int32_t sample_in) {
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if (!delta_)
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return sample_in;
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int32_t tone_sample = 0;
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if(current_tone_type_ == sine) {
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tone_sample = tone_from_sine_table();
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}
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else if(current_tone_type_ == square) {
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tone_sample = tone_square();
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}
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return (sample_in * input_mix_weight_) + (tone_sample * tone_mix_weight_);
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}
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