40 lines
958 B
C++
40 lines
958 B
C++
#include "SubOscillator.h"
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namespace serum
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{
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void SubOscillator::noteOn (double freqHz, int octaveShift)
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{
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// octaveShift: -2, -1 or 0 (from the subOct param).
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const double mult = (octaveShift == -2) ? 0.25 : (octaveShift == -1) ? 0.5 : 1.0;
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(void) freqHz;
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(void) mult;
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phase = 0.0;
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}
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void SubOscillator::processAdd (double freqHz, int shape, float level, float& out) noexcept
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{
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if (level <= 0.0f || freqHz <= 0.0)
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return;
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// The octave shift is baked into freqHz by the voice; here we just phase-accumulate.
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const double inc = kTwoPi * freqHz / sr;
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phase += inc;
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phase -= std::floor (phase * (1.0 / kTwoPi)) * kTwoPi;
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float s = 0.0f;
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if (shape == (int) SubShape::Triangle)
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{
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const float p = (float) (phase * (1.0 / kTwoPi));
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s = 1.0f - 4.0f * std::abs (p - 0.5f);
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}
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else
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{
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s = (float) std::sin (phase);
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}
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out += s * level;
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}
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} // namespace serum
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