92 lines
2.1 KiB
C++
92 lines
2.1 KiB
C++
#include "Oscillator.h"
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#include "Settings.h"
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#define TWO_PI 2 * SYNTH_PI
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Oscillator::Oscillator(OscillatorType osc, float freq, float volume) {
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SetType(osc);
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m_freq = freq;
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m_volume = volume;
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}
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Oscillator::~Oscillator() {}
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void Oscillator::Reset() {
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m_volume = 0;
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m_phase = 0;
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m_phase_dt = 0;
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}
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void Oscillator::SetType(OscillatorType osc) {
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m_osc = osc;
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switch (m_osc) {
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case Sine:
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m_osc_function = &Oscillator::sineosc;
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m_dt_function = &Oscillator::calc_sine_phase_delta;
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break;
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case Triangle:
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m_osc_function = &Oscillator::triangleosc;
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m_dt_function = &Oscillator::calc_saw_phase_delta;
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break;
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case Square:
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m_osc_function = &Oscillator::squareosc;
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m_dt_function = &Oscillator::calc_sine_phase_delta;
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break;
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case Saw:
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m_osc_function = &Oscillator::sawosc;
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m_dt_function = &Oscillator::calc_saw_phase_delta;
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break;
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}
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}
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void Oscillator::SetFreq(float freq) {
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m_freq = freq;
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m_phase = 0;
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m_phase_dt = (this->*m_dt_function)(freq);
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}
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float Oscillator::Process() {
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return (this->*m_osc_function)() * m_volume;
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}
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void Oscillator::sine_osc_phase_incr() {
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m_phase += m_phase_dt;
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if (m_phase >= TWO_PI)
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m_phase -= TWO_PI;
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}
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void Oscillator::saw_osc_phase_incr() {
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m_phase += m_phase_dt;
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if (m_phase >= 1.0f)
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m_phase -= 1.0f;
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}
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float Oscillator::calc_saw_phase_delta(float freq) {
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return freq / SAMPLE_RATE;
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}
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float Oscillator::calc_sine_phase_delta(float freq) {
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return (TWO_PI * freq) / SAMPLE_RATE;
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}
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float Oscillator::sineosc() {
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float result = sinf(m_phase);
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sine_osc_phase_incr();
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return result;
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}
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float Oscillator::sign(float v) { return (v > 0.0) ? 1.f : -1.f; }
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float Oscillator::squareosc() { return sign(sineosc()); }
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float Oscillator::triangleosc() {
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float result = 1.f - fabsf(m_phase - 0.5f) * 4.f;
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saw_osc_phase_incr();
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return result;
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}
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float Oscillator::sawosc() {
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float result = m_phase * 2.f - 1.f;
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saw_osc_phase_incr();
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return result;
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} |