111 lines
3.3 KiB
C++
111 lines
3.3 KiB
C++
#include "generator.hpp"
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/*
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sonnenlicht poly ensemble
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Copyright 2024 Gordon JC Pearce <gordonjcp@gjcp.net>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <math.h>
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#include <string.h>
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#include <cstdio>
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#include "DistrhoPluginInfo.h"
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Generator::Generator(uint32_t bufferSize, float sampleRate) {
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output = new float[bufferSize];
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// create the phase increments for each semitone
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for (uint8_t i = 0; i < 12; i++) {
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phase[i] = 0;
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uint32_t f;
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f = (1 << 31) * (65.406 * powf(2, 0.083334 * (i + 12)) / sampleRate);
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omega[i] = f;
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}
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}
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Generator::~Generator() {
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delete output;
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}
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void Generator::runBlock(uint8_t *noteTable, uint32_t frames) {
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Voice *v;
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uint32_t i;
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uint8_t k, p, key, n1, n2, d;
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float n;
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memset(output, 0, frames * sizeof(float));
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for (i = 0; i < frames; i++) {
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for (p = 0; p < 12; p++) {
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phase[p] += omega[p];
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}
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for (k = 0; k < NUM_VOICES; k++) {
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key = noteTable[k] & 0x7f;
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n1 = key % 12, n2 = (key / 12 - 3);
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v = &voices[k];
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d = (phase[n1] & (0x40000000 >> n2)) != 0;
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n = d ? 0.25 : -0.25;
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v->vc34 = ((n - v->vc34) * v->c34) + v->vc34;
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n -= v->vc34;
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n *= d ? 1 : 0;
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v->vc78 = ((n - v->vc78) * v->c78) + v->vc78;
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v->vc107 = ((v->vc78 - v->vc107) * v->c107) + v->vc107;
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d = (phase[n1] & (0x80000000 >> n2)) != 0;
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n = d ? 0.25 : -0.25;
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v->vc33 = ((n - v->vc33) * v->c33) + v->vc33;
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n -= v->vc33;
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n *= d ? 1 : 0;
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v->vc22 = ((n - v->vc22) * v->c22) + v->vc22;
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v->vc31 = ((v->vc22 - v->vc31) * v->c31) + v->vc31;
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v->vca = ((v->gate - v->vca) * v->vcatc) + v->vca;
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float v4 = (v->vc78 - v->vc107);
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float v8 = (v->vc22 - v->vc31);
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output[i] += 0.25* (v4 + v8) * v->vca; //((noteTable[k]&0x80)?0:1);
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}
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}
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}
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void Voice::startNote(uint8_t key, double sampleRate) {
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// start a new note
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// violin and viola filter params
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float fc = 88.4 * powf(2, 0.083334 * (key - 24));
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c34 = 1 - exp(-6.283 * fc / sampleRate);
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c33 = 1 - exp(-6.283 * fc / 2 / sampleRate);
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// violin register
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fc = 4000 + 65.8 * powf(2, 0.08 * (key - 24));
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c78 = 1 - exp(-6.283 * fc / sampleRate);
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c107 = 1 - exp(-6.283 * 154.0 / sampleRate);
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// viola register
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fc = 3000 + 65.8 * powf(2, 0.07 * (key - 24));
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c22 = 1 - exp(-6.283 * fc / sampleRate);
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c31 = 1 - exp(-6.283 * 150.0 / sampleRate);
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gate = 1;
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vcatc = 0.0001;
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}
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void Voice::stopNote() {
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gate = 0;
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vcatc = 0.000033;
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}
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