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| // Copyright (C)2021 - Eduard Heidt | ||
| // | ||
| // Author: Eduard Heidt (eh2k@gmx.de) | ||
| // | ||
| // Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| // of this software and associated documentation files (the "Software"), to deal | ||
| // in the Software without restriction, including without limitation the rights | ||
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| // copies of the Software, and to permit persons to whom the Software is | ||
| // furnished to do so, subject to the following conditions: | ||
| // | ||
| // The above copyright notice and this permission notice shall be included in | ||
| // all copies or substantial portions of the Software. | ||
| // | ||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
| // THE SOFTWARE. | ||
| // | ||
| // See http://creativecommons.org/licenses/MIT/ for more information. | ||
| // | ||
|
|
||
| #include "../squares-and-circles-api.h" | ||
| #include "stmlib/stmlib.h" | ||
| #include "stmlib/dsp/units.h" | ||
| #include "stmlib/dsp/filter.h" | ||
| #include "stmlib/dsp/delay_line.h" | ||
| #include <stdio.h> | ||
|
|
||
| #define clamp(value, min, max) \ | ||
| (value > max ? max : value < min ? min \ | ||
| : value) | ||
|
|
||
| int32_t time_steps = 16; | ||
| float time = 0.5f; | ||
| float color = 0.5f; | ||
| float level = 0.5f; | ||
| float pan = 0.5f; | ||
|
|
||
| constexpr static int delay_len = 48000; // 1s | ||
|
|
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| stmlib::DelayLine<uint16_t, delay_len> delay_mem[2]; | ||
| stmlib::OnePole filterLP[2]; | ||
| stmlib::OnePole filterHP[2]; | ||
|
|
||
| inline const float DelayRead(stmlib::DelayLine<uint16_t, delay_len> *line_, float delay) | ||
| { | ||
| return static_cast<float>(static_cast<int16_t>(line_->Read(delay))) / 32768.0f; | ||
| } | ||
|
|
||
| inline void DelayWrite(stmlib::DelayLine<uint16_t, delay_len> *line_, const float sample) | ||
| { | ||
| line_->Write(static_cast<uint16_t>( | ||
| stmlib::Clip16(static_cast<int32_t>(sample * 32768.0f)))); | ||
| } | ||
|
|
||
| char time_info[64] = "Time"; | ||
|
|
||
| void engine::setup() | ||
| { | ||
| delay_mem[0].Init(); | ||
| delay_mem[1].Init(); | ||
|
|
||
| engine::addParam(time_info, &time_steps, 1, 64); | ||
| engine::addParam("Feedb", &level); | ||
| engine::addParam("Color", &color); | ||
| engine::addParam("Pan", &pan); | ||
| } | ||
|
|
||
| float delay = 0; | ||
| float t_32 = 0; | ||
|
|
||
| bool calc_t_step32() | ||
| { | ||
| uint32_t midi_bpm = machine::midi_bpm();// / 100; | ||
| if (midi_bpm > 0) | ||
| { | ||
| engine::addParam(time_info, &time_steps, 1, 128); | ||
| uint32_t bpm = midi_bpm; | ||
| auto t_per_beat = 6000.f / bpm; // * machine::SAMPLE_RATE | ||
| t_32 = t_per_beat / 32; | ||
| return true; | ||
| } | ||
| else | ||
| { | ||
| engine::addParam(time_info, &time); | ||
| t_32 = 1.f / 256.f; | ||
| return false; | ||
| } | ||
| } | ||
|
|
||
| void sync_params() | ||
| { | ||
| if (calc_t_step32()) | ||
| time = time_steps * t_32; | ||
|
|
||
| float colorFreq = std::pow(100.f, 2.f * color - 1.f); | ||
| float lowpassFreq = clamp(20000.f * colorFreq, 20.f, 20000.f) / SAMPLE_RATE; | ||
| float highpassFreq = clamp(20.f * colorFreq, 20.f, 20000.f) / SAMPLE_RATE; | ||
|
|
||
| filterLP[0].set_f<stmlib::FREQUENCY_DIRTY>(lowpassFreq); | ||
| filterLP[1].set_f<stmlib::FREQUENCY_DIRTY>(lowpassFreq); | ||
| filterHP[0].set_f<stmlib::FREQUENCY_DIRTY>(highpassFreq); | ||
| filterHP[1].set_f<stmlib::FREQUENCY_DIRTY>(highpassFreq); | ||
| } | ||
|
|
||
| void engine::process() | ||
| { | ||
| sync_params(); | ||
|
|
||
| int n = time / t_32; | ||
| float d = n * t_32 * SAMPLE_RATE; | ||
|
|
||
| if (fabsf(d - delay) > SAMPLE_RATE / 10) | ||
| delay = d; | ||
| else | ||
| ONE_POLE(delay, d, 0.01f); | ||
|
|
||
| auto inputL = engine::inputBuffer<0>(); | ||
| auto inputR = engine::inputBuffer<1>(); | ||
| auto outputL = engine::outputBuffer<0>(); | ||
| auto outputR = engine::outputBuffer<1>(); | ||
|
|
||
| for (int i = 0; i < FRAME_BUFFER_SIZE; i++) | ||
| { | ||
| float readL = DelayRead(&delay_mem[0], (int)delay); | ||
| float readR = DelayRead(&delay_mem[1], (int)delay); | ||
|
|
||
| auto inL = inputL[i]; | ||
| auto inR = inputR[i]; | ||
|
|
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| inL = filterLP[0].Process<stmlib::FILTER_MODE_LOW_PASS>(inL); | ||
| inL = filterHP[0].Process<stmlib::FILTER_MODE_HIGH_PASS>(inL); | ||
| inR = filterLP[1].Process<stmlib::FILTER_MODE_LOW_PASS>(inR); | ||
| inR = filterHP[1].Process<stmlib::FILTER_MODE_HIGH_PASS>(inR); | ||
|
|
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| DelayWrite(&delay_mem[0], (readR + inL * (0 + pan) * 2) * level); | ||
| DelayWrite(&delay_mem[1], (readL + inR * (1 - pan) * 2) * level); | ||
|
|
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| outputL[i] = readL + inputL[i]; | ||
| outputR[i] = readR + inputR[i]; | ||
| } | ||
| } | ||
|
|
||
| void engine::draw() | ||
| { | ||
| if (calc_t_step32()) | ||
| { | ||
| sprintf(time_info, ">t=%d", time_steps); | ||
| } | ||
| else | ||
| sprintf(time_info, ">T:%d ms", (int)(time * 1000)); | ||
| } |
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