110 lines
2.6 KiB
C++
110 lines
2.6 KiB
C++
#include "Oscillator.h"
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#include "Settings.h"
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#include "KeyBoard.h"
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#include "Logger.h"
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#define TWO_PI 2 * SYNTH_PI
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Oscillator::Oscillator(OscillatorType osc, float fine, float volume) {
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assert(fine >= -2.f && fine <= 2.f);
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assert(volume >= 0.f && volume <= 1.f);
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SetType(osc);
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m_fine = fine;
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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::CalcSinePhaseDelta;
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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::CalcSawPhaseDelta;
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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::CalcSinePhaseDelta;
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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::CalcSawPhaseDelta;
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break;
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}
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}
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void Oscillator::SetType(std::string const& osc_name) {
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if (osc_name == "Sine")
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m_osc = Sine;
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else if (osc_name == "Triangle")
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m_osc = Triangle;
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else if (osc_name == "Saw")
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m_osc = Saw;
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else if (osc_name == "Square")
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m_osc = Square;
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SetType(m_osc);
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}
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void Oscillator::SetKey(float key) {
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m_key = key;
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float freq = KeyBoard::GetHzBySemitone(m_key + m_fine);
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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::SineOscPhaseIncr() {
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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::SawOscPhaseIncr() {
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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::CalcSawPhaseDelta(float freq) {
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return freq / SAMPLE_RATE;
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}
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float Oscillator::CalcSinePhaseDelta(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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SineOscPhaseIncr();
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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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SawOscPhaseIncr();
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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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SawOscPhaseIncr();
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return result;
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} |